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Commit | Line | Data |
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0628567a | 1 | /* execute_cmd.c -- Execute a COMMAND structure. */ |
726f6388 | 2 | |
8868edaf | 3 | /* Copyright (C) 1987-2020 Free Software Foundation, Inc. |
726f6388 JA |
4 | |
5 | This file is part of GNU Bash, the Bourne Again SHell. | |
6 | ||
3185942a JA |
7 | Bash is free software: you can redistribute it and/or modify |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation, either version 3 of the License, or | |
10 | (at your option) any later version. | |
726f6388 | 11 | |
3185942a JA |
12 | Bash is distributed in the hope that it will be useful, |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
726f6388 JA |
16 | |
17 | You should have received a copy of the GNU General Public License | |
3185942a JA |
18 | along with Bash. If not, see <http://www.gnu.org/licenses/>. |
19 | */ | |
20 | ||
ccc6cda3 JA |
21 | #include "config.h" |
22 | ||
23 | #if !defined (__GNUC__) && !defined (HAVE_ALLOCA_H) && defined (_AIX) | |
726f6388 | 24 | #pragma alloca |
ccc6cda3 | 25 | #endif /* _AIX && RISC6000 && !__GNUC__ */ |
726f6388 JA |
26 | |
27 | #include <stdio.h> | |
f73dda09 | 28 | #include "chartypes.h" |
726f6388 | 29 | #include "bashtypes.h" |
b80f6443 | 30 | #if !defined (_MINIX) && defined (HAVE_SYS_FILE_H) |
cce855bc JA |
31 | # include <sys/file.h> |
32 | #endif | |
726f6388 JA |
33 | #include "filecntl.h" |
34 | #include "posixstat.h" | |
35 | #include <signal.h> | |
ac50fbac | 36 | #if defined (HAVE_SYS_PARAM_H) |
cce855bc JA |
37 | # include <sys/param.h> |
38 | #endif | |
726f6388 | 39 | |
ccc6cda3 JA |
40 | #if defined (HAVE_UNISTD_H) |
41 | # include <unistd.h> | |
42 | #endif | |
43 | ||
bb70624e | 44 | #include "posixtime.h" |
ccc6cda3 | 45 | |
cce855bc | 46 | #if defined (HAVE_SYS_RESOURCE_H) && !defined (RLIMTYPE) |
ccc6cda3 JA |
47 | # include <sys/resource.h> |
48 | #endif | |
49 | ||
50 | #if defined (HAVE_SYS_TIMES_H) && defined (HAVE_TIMES) | |
51 | # include <sys/times.h> | |
726f6388 JA |
52 | #endif |
53 | ||
726f6388 JA |
54 | #include <errno.h> |
55 | ||
56 | #if !defined (errno) | |
57 | extern int errno; | |
58 | #endif | |
59 | ||
0001803f | 60 | #define NEED_FPURGE_DECL |
a0c0a00f | 61 | #define NEED_SH_SETLINEBUF_DECL |
0001803f | 62 | |
ccc6cda3 | 63 | #include "bashansi.h" |
b80f6443 | 64 | #include "bashintl.h" |
726f6388 | 65 | |
ccc6cda3 | 66 | #include "memalloc.h" |
726f6388 | 67 | #include "shell.h" |
d166f048 | 68 | #include <y.tab.h> /* use <...> so we pick it up from the build directory */ |
d233b485 | 69 | #include "parser.h" |
726f6388 | 70 | #include "flags.h" |
ccc6cda3 JA |
71 | #include "builtins.h" |
72 | #include "hashlib.h" | |
726f6388 JA |
73 | #include "jobs.h" |
74 | #include "execute_cmd.h" | |
cce855bc JA |
75 | #include "findcmd.h" |
76 | #include "redir.h" | |
ccc6cda3 JA |
77 | #include "trap.h" |
78 | #include "pathexp.h" | |
d166f048 | 79 | #include "hashcmd.h" |
726f6388 | 80 | |
cce855bc JA |
81 | #if defined (COND_COMMAND) |
82 | # include "test.h" | |
83 | #endif | |
84 | ||
726f6388 JA |
85 | #include "builtins/common.h" |
86 | #include "builtins/builtext.h" /* list of builtins */ | |
87 | ||
a0c0a00f CR |
88 | #include "builtins/getopt.h" |
89 | ||
f73dda09 | 90 | #include <glob/strmatch.h> |
726f6388 JA |
91 | #include <tilde/tilde.h> |
92 | ||
93 | #if defined (BUFFERED_INPUT) | |
94 | # include "input.h" | |
95 | #endif | |
96 | ||
ccc6cda3 JA |
97 | #if defined (ALIAS) |
98 | # include "alias.h" | |
99 | #endif | |
100 | ||
101 | #if defined (HISTORY) | |
102 | # include "bashhist.h" | |
103 | #endif | |
104 | ||
a0c0a00f CR |
105 | #if defined (HAVE_MBSTR_H) && defined (HAVE_MBSCHR) |
106 | # include <mbstr.h> /* mbschr */ | |
107 | #endif | |
108 | ||
d233b485 CR |
109 | extern int command_string_index; |
110 | extern char *the_printed_command; | |
495aee44 | 111 | extern time_t shell_start_time; |
8868edaf CR |
112 | #if defined (HAVE_GETTIMEOFDAY) |
113 | extern struct timeval shellstart; | |
114 | #endif | |
f73dda09 | 115 | #if 0 |
ccc6cda3 | 116 | extern char *glob_argv_flags; |
f73dda09 | 117 | #endif |
726f6388 | 118 | |
8868edaf | 119 | extern int close PARAMS((int)); |
726f6388 JA |
120 | |
121 | /* Static functions defined and used in this file. */ | |
8868edaf CR |
122 | static void close_pipes PARAMS((int, int)); |
123 | static void do_piping PARAMS((int, int)); | |
124 | static void bind_lastarg PARAMS((char *)); | |
125 | static int shell_control_structure PARAMS((enum command_type)); | |
126 | static void cleanup_redirects PARAMS((REDIRECT *)); | |
f73dda09 JA |
127 | |
128 | #if defined (JOB_CONTROL) | |
8868edaf | 129 | static int restore_signal_mask PARAMS((sigset_t *)); |
f73dda09 | 130 | #endif |
ccc6cda3 | 131 | |
8868edaf | 132 | static int builtin_status PARAMS((int)); |
f73dda09 | 133 | |
8868edaf | 134 | static int execute_for_command PARAMS((FOR_COM *)); |
ccc6cda3 | 135 | #if defined (SELECT_COMMAND) |
8868edaf CR |
136 | static int displen PARAMS((const char *)); |
137 | static int print_index_and_element PARAMS((int, int, WORD_LIST *)); | |
138 | static void indent PARAMS((int, int)); | |
139 | static void print_select_list PARAMS((WORD_LIST *, int, int, int)); | |
140 | static char *select_query PARAMS((WORD_LIST *, int, char *, int)); | |
141 | static int execute_select_command PARAMS((SELECT_COM *)); | |
ccc6cda3 | 142 | #endif |
cce855bc | 143 | #if defined (DPAREN_ARITHMETIC) |
8868edaf | 144 | static int execute_arith_command PARAMS((ARITH_COM *)); |
cce855bc JA |
145 | #endif |
146 | #if defined (COND_COMMAND) | |
8868edaf CR |
147 | static int execute_cond_node PARAMS((COND_COM *)); |
148 | static int execute_cond_command PARAMS((COND_COM *)); | |
cce855bc | 149 | #endif |
d166f048 | 150 | #if defined (COMMAND_TIMING) |
8868edaf CR |
151 | static int mkfmt PARAMS((char *, int, int, time_t, int)); |
152 | static void print_formatted_time PARAMS((FILE *, char *, | |
f73dda09 JA |
153 | time_t, int, time_t, int, |
154 | time_t, int, int)); | |
8868edaf | 155 | static int time_command PARAMS((COMMAND *, int, int, int, struct fd_bitmap *)); |
d166f048 | 156 | #endif |
bb70624e | 157 | #if defined (ARITH_FOR_COMMAND) |
8868edaf CR |
158 | static intmax_t eval_arith_for_expr PARAMS((WORD_LIST *, int *)); |
159 | static int execute_arith_for_command PARAMS((ARITH_FOR_COM *)); | |
160 | #endif | |
161 | static int execute_case_command PARAMS((CASE_COM *)); | |
162 | static int execute_while_command PARAMS((WHILE_COM *)); | |
163 | static int execute_until_command PARAMS((WHILE_COM *)); | |
164 | static int execute_while_or_until PARAMS((WHILE_COM *, int)); | |
165 | static int execute_if_command PARAMS((IF_COM *)); | |
166 | static int execute_null_command PARAMS((REDIRECT *, int, int, int)); | |
167 | static void fix_assignment_words PARAMS((WORD_LIST *)); | |
168 | static int execute_simple_command PARAMS((SIMPLE_COM *, int, int, int, struct fd_bitmap *)); | |
169 | static int execute_builtin PARAMS((sh_builtin_func_t *, WORD_LIST *, int, int)); | |
170 | static int execute_function PARAMS((SHELL_VAR *, WORD_LIST *, int, struct fd_bitmap *, int, int)); | |
171 | static int execute_builtin_or_function PARAMS((WORD_LIST *, sh_builtin_func_t *, | |
f73dda09 JA |
172 | SHELL_VAR *, |
173 | REDIRECT *, struct fd_bitmap *, int)); | |
8868edaf | 174 | static void execute_subshell_builtin_or_function PARAMS((WORD_LIST *, REDIRECT *, |
f73dda09 JA |
175 | sh_builtin_func_t *, |
176 | SHELL_VAR *, | |
177 | int, int, int, | |
178 | struct fd_bitmap *, | |
179 | int)); | |
8868edaf | 180 | static int execute_disk_command PARAMS((WORD_LIST *, REDIRECT *, char *, |
f73dda09 JA |
181 | int, int, int, struct fd_bitmap *, int)); |
182 | ||
8868edaf CR |
183 | static char *getinterp PARAMS((char *, int, int *)); |
184 | static void initialize_subshell PARAMS((void)); | |
185 | static int execute_in_subshell PARAMS((COMMAND *, int, int, int, struct fd_bitmap *)); | |
3185942a | 186 | #if defined (COPROCESS_SUPPORT) |
8868edaf CR |
187 | static void coproc_setstatus PARAMS((struct coproc *, int)); |
188 | static int execute_coproc PARAMS((COMMAND *, int, int, struct fd_bitmap *)); | |
3185942a | 189 | #endif |
f73dda09 | 190 | |
8868edaf | 191 | static int execute_pipeline PARAMS((COMMAND *, int, int, int, struct fd_bitmap *)); |
f73dda09 | 192 | |
8868edaf | 193 | static int execute_connection PARAMS((COMMAND *, int, int, int, struct fd_bitmap *)); |
f73dda09 | 194 | |
8868edaf | 195 | static int execute_intern_function PARAMS((WORD_DESC *, FUNCTION_DEF *)); |
f73dda09 | 196 | |
d166f048 JA |
197 | /* Set to 1 if fd 0 was the subject of redirection to a subshell. Global |
198 | so that reader_loop can set it to zero before executing a command. */ | |
199 | int stdin_redir; | |
726f6388 JA |
200 | |
201 | /* The name of the command that is currently being executed. | |
202 | `test' needs this, for example. */ | |
203 | char *this_command_name; | |
204 | ||
b80f6443 JA |
205 | /* The printed representation of the currently-executing command (same as |
206 | the_printed_command), except when a trap is being executed. Useful for | |
207 | a debugger to know where exactly the program is currently executing. */ | |
208 | char *the_printed_command_except_trap; | |
209 | ||
726f6388 | 210 | /* For catching RETURN in a function. */ |
ccc6cda3 | 211 | int return_catch_flag; |
726f6388 | 212 | int return_catch_value; |
ccc6cda3 | 213 | procenv_t return_catch; |
726f6388 JA |
214 | |
215 | /* The value returned by the last synchronous command. */ | |
a0c0a00f | 216 | volatile int last_command_exit_value; |
726f6388 | 217 | |
b80f6443 JA |
218 | /* Whether or not the last command (corresponding to last_command_exit_value) |
219 | was terminated by a signal, and, if so, which one. */ | |
220 | int last_command_exit_signal; | |
221 | ||
ac50fbac CR |
222 | /* Are we currently ignoring the -e option for the duration of a builtin's |
223 | execution? */ | |
224 | int builtin_ignoring_errexit = 0; | |
225 | ||
726f6388 JA |
226 | /* The list of redirections to perform which will undo the redirections |
227 | that I made in the shell. */ | |
228 | REDIRECT *redirection_undo_list = (REDIRECT *)NULL; | |
229 | ||
230 | /* The list of redirections to perform which will undo the internal | |
231 | redirections performed by the `exec' builtin. These are redirections | |
232 | that must be undone even when exec discards redirection_undo_list. */ | |
233 | REDIRECT *exec_redirection_undo_list = (REDIRECT *)NULL; | |
234 | ||
3185942a JA |
235 | /* When greater than zero, value is the `level' of builtins we are |
236 | currently executing (e.g. `eval echo a' would have it set to 2). */ | |
237 | int executing_builtin = 0; | |
238 | ||
239 | /* Non-zero if we are executing a command list (a;b;c, etc.) */ | |
240 | int executing_list = 0; | |
241 | ||
242 | /* Non-zero if failing commands in a command substitution should not exit the | |
243 | shell even if -e is set. Used to pass the CMD_IGNORE_RETURN flag down to | |
244 | commands run in command substitutions by parse_and_execute. */ | |
245 | int comsub_ignore_return = 0; | |
246 | ||
726f6388 JA |
247 | /* Non-zero if we have just forked and are currently running in a subshell |
248 | environment. */ | |
ccc6cda3 JA |
249 | int subshell_environment; |
250 | ||
b80f6443 JA |
251 | /* Count of nested subshells, like SHLVL. Available via $BASH_SUBSHELL */ |
252 | int subshell_level = 0; | |
253 | ||
bb70624e JA |
254 | /* Currently-executing shell function. */ |
255 | SHELL_VAR *this_shell_function; | |
256 | ||
95732b49 JA |
257 | /* If non-zero, matches in case and [[ ... ]] are case-insensitive */ |
258 | int match_ignore_case = 0; | |
259 | ||
495aee44 CR |
260 | int executing_command_builtin = 0; |
261 | ||
3185942a JA |
262 | struct stat SB; /* used for debugging */ |
263 | ||
264 | static int special_builtin_failed; | |
265 | ||
266 | static COMMAND *currently_executing_command; | |
267 | ||
268 | /* The line number that the currently executing function starts on. */ | |
269 | static int function_line_number; | |
270 | ||
271 | /* XXX - set to 1 if we're running the DEBUG trap and we want to show the line | |
272 | number containing the function name. Used by executing_line_number to | |
273 | report the correct line number. Kind of a hack. */ | |
274 | static int showing_function_line; | |
275 | ||
d233b485 CR |
276 | static int connection_count; |
277 | ||
ac50fbac CR |
278 | /* $LINENO ($BASH_LINENO) for use by an ERR trap. Global so parse_and_execute |
279 | can save and restore it. */ | |
280 | int line_number_for_err_trap; | |
3185942a | 281 | |
0001803f | 282 | /* A sort of function nesting level counter */ |
495aee44 | 283 | int funcnest = 0; |
a0c0a00f CR |
284 | int funcnest_max = 0; |
285 | ||
d233b485 | 286 | int evalnest = 0; |
a0c0a00f CR |
287 | int evalnest_max = EVALNEST_MAX; |
288 | ||
289 | int sourcenest = 0; | |
290 | int sourcenest_max = SOURCENEST_MAX; | |
291 | ||
292 | volatile int from_return_trap = 0; | |
495aee44 CR |
293 | |
294 | int lastpipe_opt = 0; | |
0001803f | 295 | |
726f6388 JA |
296 | struct fd_bitmap *current_fds_to_close = (struct fd_bitmap *)NULL; |
297 | ||
f73dda09 | 298 | #define FD_BITMAP_DEFAULT_SIZE 32 |
d166f048 | 299 | |
726f6388 JA |
300 | /* Functions to allocate and deallocate the structures used to pass |
301 | information from the shell to its children about file descriptors | |
302 | to close. */ | |
303 | struct fd_bitmap * | |
304 | new_fd_bitmap (size) | |
f73dda09 | 305 | int size; |
726f6388 JA |
306 | { |
307 | struct fd_bitmap *ret; | |
308 | ||
309 | ret = (struct fd_bitmap *)xmalloc (sizeof (struct fd_bitmap)); | |
310 | ||
311 | ret->size = size; | |
312 | ||
313 | if (size) | |
314 | { | |
f73dda09 | 315 | ret->bitmap = (char *)xmalloc (size); |
7117c2d2 | 316 | memset (ret->bitmap, '\0', size); |
726f6388 JA |
317 | } |
318 | else | |
319 | ret->bitmap = (char *)NULL; | |
320 | return (ret); | |
321 | } | |
322 | ||
323 | void | |
324 | dispose_fd_bitmap (fdbp) | |
325 | struct fd_bitmap *fdbp; | |
326 | { | |
327 | FREE (fdbp->bitmap); | |
328 | free (fdbp); | |
329 | } | |
330 | ||
331 | void | |
332 | close_fd_bitmap (fdbp) | |
333 | struct fd_bitmap *fdbp; | |
334 | { | |
335 | register int i; | |
336 | ||
337 | if (fdbp) | |
338 | { | |
339 | for (i = 0; i < fdbp->size; i++) | |
340 | if (fdbp->bitmap[i]) | |
341 | { | |
342 | close (i); | |
343 | fdbp->bitmap[i] = 0; | |
344 | } | |
345 | } | |
346 | } | |
347 | ||
ccc6cda3 JA |
348 | /* Return the line number of the currently executing command. */ |
349 | int | |
350 | executing_line_number () | |
351 | { | |
b80f6443 JA |
352 | if (executing && showing_function_line == 0 && |
353 | (variable_context == 0 || interactive_shell == 0) && | |
354 | currently_executing_command) | |
7117c2d2 | 355 | { |
b80f6443 JA |
356 | #if defined (COND_COMMAND) |
357 | if (currently_executing_command->type == cm_cond) | |
7117c2d2 | 358 | return currently_executing_command->value.Cond->line; |
b80f6443 JA |
359 | #endif |
360 | #if defined (DPAREN_ARITHMETIC) | |
ac50fbac | 361 | if (currently_executing_command->type == cm_arith) |
7117c2d2 | 362 | return currently_executing_command->value.Arith->line; |
b80f6443 JA |
363 | #endif |
364 | #if defined (ARITH_FOR_COMMAND) | |
ac50fbac | 365 | if (currently_executing_command->type == cm_arith_for) |
7117c2d2 | 366 | return currently_executing_command->value.ArithFor->line; |
b80f6443 JA |
367 | #endif |
368 | ||
7117c2d2 JA |
369 | return line_number; |
370 | } | |
d166f048 JA |
371 | else |
372 | return line_number; | |
ccc6cda3 JA |
373 | } |
374 | ||
726f6388 JA |
375 | /* Execute the command passed in COMMAND. COMMAND is exactly what |
376 | read_command () places into GLOBAL_COMMAND. See "command.h" for the | |
377 | details of the command structure. | |
378 | ||
379 | EXECUTION_SUCCESS or EXECUTION_FAILURE are the only possible | |
380 | return values. Executing a command with nothing in it returns | |
381 | EXECUTION_SUCCESS. */ | |
ccc6cda3 | 382 | int |
726f6388 JA |
383 | execute_command (command) |
384 | COMMAND *command; | |
385 | { | |
386 | struct fd_bitmap *bitmap; | |
387 | int result; | |
388 | ||
389 | current_fds_to_close = (struct fd_bitmap *)NULL; | |
390 | bitmap = new_fd_bitmap (FD_BITMAP_DEFAULT_SIZE); | |
391 | begin_unwind_frame ("execute-command"); | |
392 | add_unwind_protect (dispose_fd_bitmap, (char *)bitmap); | |
393 | ||
394 | /* Just do the command, but not asynchronously. */ | |
395 | result = execute_command_internal (command, 0, NO_PIPE, NO_PIPE, bitmap); | |
396 | ||
397 | dispose_fd_bitmap (bitmap); | |
398 | discard_unwind_frame ("execute-command"); | |
399 | ||
400 | #if defined (PROCESS_SUBSTITUTION) | |
bb70624e JA |
401 | /* don't unlink fifos if we're in a shell function; wait until the function |
402 | returns. */ | |
d233b485 | 403 | if (variable_context == 0 && executing_list == 0) |
bb70624e | 404 | unlink_fifo_list (); |
726f6388 JA |
405 | #endif /* PROCESS_SUBSTITUTION */ |
406 | ||
0628567a | 407 | QUIT; |
726f6388 JA |
408 | return (result); |
409 | } | |
410 | ||
411 | /* Return 1 if TYPE is a shell control structure type. */ | |
412 | static int | |
413 | shell_control_structure (type) | |
414 | enum command_type type; | |
415 | { | |
416 | switch (type) | |
417 | { | |
bb70624e JA |
418 | #if defined (ARITH_FOR_COMMAND) |
419 | case cm_arith_for: | |
420 | #endif | |
726f6388 JA |
421 | #if defined (SELECT_COMMAND) |
422 | case cm_select: | |
cce855bc JA |
423 | #endif |
424 | #if defined (DPAREN_ARITHMETIC) | |
425 | case cm_arith: | |
426 | #endif | |
427 | #if defined (COND_COMMAND) | |
428 | case cm_cond: | |
726f6388 JA |
429 | #endif |
430 | case cm_case: | |
431 | case cm_while: | |
432 | case cm_until: | |
433 | case cm_if: | |
95732b49 | 434 | case cm_for: |
726f6388 | 435 | case cm_group: |
95732b49 | 436 | case cm_function_def: |
726f6388 JA |
437 | return (1); |
438 | ||
439 | default: | |
440 | return (0); | |
441 | } | |
442 | } | |
443 | ||
444 | /* A function to use to unwind_protect the redirection undo list | |
445 | for loops. */ | |
446 | static void | |
447 | cleanup_redirects (list) | |
448 | REDIRECT *list; | |
449 | { | |
b80f6443 | 450 | do_redirections (list, RX_ACTIVE); |
726f6388 JA |
451 | dispose_redirects (list); |
452 | } | |
453 | ||
d233b485 CR |
454 | void |
455 | undo_partial_redirects () | |
456 | { | |
457 | if (redirection_undo_list) | |
458 | { | |
459 | cleanup_redirects (redirection_undo_list); | |
460 | redirection_undo_list = (REDIRECT *)NULL; | |
461 | } | |
462 | } | |
463 | ||
ccc6cda3 | 464 | #if 0 |
726f6388 JA |
465 | /* Function to unwind_protect the redirections for functions and builtins. */ |
466 | static void | |
467 | cleanup_func_redirects (list) | |
468 | REDIRECT *list; | |
469 | { | |
b80f6443 | 470 | do_redirections (list, RX_ACTIVE); |
726f6388 | 471 | } |
ccc6cda3 | 472 | #endif |
726f6388 | 473 | |
cce855bc | 474 | void |
726f6388 JA |
475 | dispose_exec_redirects () |
476 | { | |
477 | if (exec_redirection_undo_list) | |
478 | { | |
479 | dispose_redirects (exec_redirection_undo_list); | |
480 | exec_redirection_undo_list = (REDIRECT *)NULL; | |
481 | } | |
482 | } | |
483 | ||
d233b485 CR |
484 | void |
485 | dispose_partial_redirects () | |
486 | { | |
487 | if (redirection_undo_list) | |
488 | { | |
489 | dispose_redirects (redirection_undo_list); | |
490 | redirection_undo_list = (REDIRECT *)NULL; | |
491 | } | |
492 | } | |
493 | ||
726f6388 JA |
494 | #if defined (JOB_CONTROL) |
495 | /* A function to restore the signal mask to its proper value when the shell | |
496 | is interrupted or errors occur while creating a pipeline. */ | |
497 | static int | |
498 | restore_signal_mask (set) | |
f73dda09 | 499 | sigset_t *set; |
726f6388 | 500 | { |
f73dda09 | 501 | return (sigprocmask (SIG_SETMASK, set, (sigset_t *)NULL)); |
726f6388 JA |
502 | } |
503 | #endif /* JOB_CONTROL */ | |
504 | ||
f73dda09 | 505 | #ifdef DEBUG |
726f6388 JA |
506 | /* A debugging function that can be called from gdb, for instance. */ |
507 | void | |
508 | open_files () | |
509 | { | |
510 | register int i; | |
511 | int f, fd_table_size; | |
512 | ||
513 | fd_table_size = getdtablesize (); | |
514 | ||
f73dda09 | 515 | fprintf (stderr, "pid %ld open files:", (long)getpid ()); |
726f6388 JA |
516 | for (i = 3; i < fd_table_size; i++) |
517 | { | |
518 | if ((f = fcntl (i, F_GETFD, 0)) != -1) | |
519 | fprintf (stderr, " %d (%s)", i, f ? "close" : "open"); | |
520 | } | |
521 | fprintf (stderr, "\n"); | |
522 | } | |
f73dda09 | 523 | #endif |
726f6388 | 524 | |
8868edaf | 525 | void |
d166f048 JA |
526 | async_redirect_stdin () |
527 | { | |
528 | int fd; | |
529 | ||
530 | fd = open ("/dev/null", O_RDONLY); | |
531 | if (fd > 0) | |
532 | { | |
533 | dup2 (fd, 0); | |
534 | close (fd); | |
535 | } | |
536 | else if (fd < 0) | |
b80f6443 | 537 | internal_error (_("cannot redirect standard input from /dev/null: %s"), strerror (errno)); |
d166f048 JA |
538 | } |
539 | ||
ccc6cda3 | 540 | #define DESCRIBE_PID(pid) do { if (interactive) describe_pid (pid); } while (0) |
726f6388 | 541 | |
ac50fbac | 542 | /* Execute the command passed in COMMAND, perhaps doing it asynchronously. |
726f6388 | 543 | COMMAND is exactly what read_command () places into GLOBAL_COMMAND. |
8868edaf | 544 | ASYNCHRONOUS, if non-zero, says to do this command in the background. |
726f6388 JA |
545 | PIPE_IN and PIPE_OUT are file descriptors saying where input comes |
546 | from and where it goes. They can have the value of NO_PIPE, which means | |
547 | I/O is stdin/stdout. | |
548 | FDS_TO_CLOSE is a list of file descriptors to close once the child has | |
549 | been forked. This list often contains the unusable sides of pipes, etc. | |
550 | ||
551 | EXECUTION_SUCCESS or EXECUTION_FAILURE are the only possible | |
552 | return values. Executing a command with nothing in it returns | |
553 | EXECUTION_SUCCESS. */ | |
ccc6cda3 JA |
554 | int |
555 | execute_command_internal (command, asynchronous, pipe_in, pipe_out, | |
726f6388 JA |
556 | fds_to_close) |
557 | COMMAND *command; | |
558 | int asynchronous; | |
559 | int pipe_in, pipe_out; | |
560 | struct fd_bitmap *fds_to_close; | |
561 | { | |
8868edaf | 562 | int exec_result, user_subshell, invert, ignore_return, was_error_trap, fork_flags; |
d166f048 | 563 | REDIRECT *my_undo_list, *exec_undo_list; |
ac50fbac | 564 | char *tcmd; |
b80f6443 | 565 | volatile int save_line_number; |
ac50fbac CR |
566 | #if defined (PROCESS_SUBSTITUTION) |
567 | volatile int ofifo, nfifo, osize, saved_fifo; | |
9e49d343 | 568 | volatile void *ofifo_list; |
ac50fbac | 569 | #endif |
726f6388 | 570 | |
f1be666c JA |
571 | if (breaking || continuing) |
572 | return (last_command_exit_value); | |
573 | if (command == 0 || read_but_dont_execute) | |
574 | return (EXECUTION_SUCCESS); | |
726f6388 | 575 | |
0628567a | 576 | QUIT; |
726f6388 JA |
577 | run_pending_traps (); |
578 | ||
b80f6443 | 579 | #if 0 |
ccc6cda3 | 580 | if (running_trap == 0) |
b80f6443 | 581 | #endif |
ccc6cda3 JA |
582 | currently_executing_command = command; |
583 | ||
726f6388 | 584 | invert = (command->flags & CMD_INVERT_RETURN) != 0; |
d166f048 JA |
585 | |
586 | /* If we're inverting the return value and `set -e' has been executed, | |
587 | we don't want a failing command to inadvertently cause the shell | |
588 | to exit. */ | |
589 | if (exit_immediately_on_error && invert) /* XXX */ | |
590 | command->flags |= CMD_IGNORE_RETURN; /* XXX */ | |
591 | ||
ccc6cda3 | 592 | exec_result = EXECUTION_SUCCESS; |
726f6388 JA |
593 | |
594 | /* If a command was being explicitly run in a subshell, or if it is | |
595 | a shell control-structure, and it has a pipe, then we do the command | |
596 | in a subshell. */ | |
bb70624e JA |
597 | if (command->type == cm_subshell && (command->flags & CMD_NO_FORK)) |
598 | return (execute_in_subshell (command, asynchronous, pipe_in, pipe_out, fds_to_close)); | |
726f6388 | 599 | |
3185942a JA |
600 | #if defined (COPROCESS_SUPPORT) |
601 | if (command->type == cm_coproc) | |
d233b485 | 602 | return (last_command_exit_value = execute_coproc (command, pipe_in, pipe_out, fds_to_close)); |
3185942a JA |
603 | #endif |
604 | ||
17345e5a JA |
605 | user_subshell = command->type == cm_subshell || ((command->flags & CMD_WANT_SUBSHELL) != 0); |
606 | ||
d233b485 CR |
607 | #if defined (TIME_BEFORE_SUBSHELL) |
608 | if ((command->flags & CMD_TIME_PIPELINE) && user_subshell && asynchronous == 0) | |
609 | { | |
610 | command->flags |= CMD_FORCE_SUBSHELL; | |
611 | exec_result = time_command (command, asynchronous, pipe_in, pipe_out, fds_to_close); | |
612 | currently_executing_command = (COMMAND *)NULL; | |
613 | return (exec_result); | |
614 | } | |
615 | #endif | |
616 | ||
bb70624e JA |
617 | if (command->type == cm_subshell || |
618 | (command->flags & (CMD_WANT_SUBSHELL|CMD_FORCE_SUBSHELL)) || | |
726f6388 JA |
619 | (shell_control_structure (command->type) && |
620 | (pipe_out != NO_PIPE || pipe_in != NO_PIPE || asynchronous))) | |
621 | { | |
622 | pid_t paren_pid; | |
ac50fbac | 623 | int s; |
d233b485 | 624 | char *p; |
726f6388 JA |
625 | |
626 | /* Fork a subshell, turn off the subshell bit, turn off job | |
627 | control and call execute_command () on the command again. */ | |
8868edaf | 628 | save_line_number = line_number; |
d233b485 CR |
629 | if (command->type == cm_subshell) |
630 | line_number_for_err_trap = line_number = command->value.Subshell->line; /* XXX - save value? */ | |
631 | /* Otherwise we defer setting line_number */ | |
ac50fbac | 632 | tcmd = make_command_string (command); |
8868edaf CR |
633 | fork_flags = asynchronous ? FORK_ASYNC : 0; |
634 | paren_pid = make_child (p = savestring (tcmd), fork_flags); | |
ac50fbac CR |
635 | |
636 | if (user_subshell && signal_is_trapped (ERROR_TRAP) && | |
637 | signal_in_progress (DEBUG_TRAP) == 0 && running_trap == 0) | |
638 | { | |
639 | FREE (the_printed_command_except_trap); | |
640 | the_printed_command_except_trap = savestring (the_printed_command); | |
641 | } | |
642 | ||
726f6388 | 643 | if (paren_pid == 0) |
ac50fbac | 644 | { |
d233b485 CR |
645 | #if defined (JOB_CONTROL) |
646 | FREE (p); /* child doesn't use pointer */ | |
647 | #endif | |
ac50fbac CR |
648 | /* We want to run the exit trap for forced {} subshells, and we |
649 | want to note this before execute_in_subshell modifies the | |
650 | COMMAND struct. Need to keep in mind that execute_in_subshell | |
651 | runs the exit trap for () subshells itself. */ | |
652 | /* This handles { command; } & */ | |
653 | s = user_subshell == 0 && command->type == cm_group && pipe_in == NO_PIPE && pipe_out == NO_PIPE && asynchronous; | |
654 | /* run exit trap for : | { ...; } and { ...; } | : */ | |
655 | /* run exit trap for : | ( ...; ) and ( ...; ) | : */ | |
656 | s += user_subshell == 0 && command->type == cm_group && (pipe_in != NO_PIPE || pipe_out != NO_PIPE) && asynchronous == 0; | |
657 | ||
658 | last_command_exit_value = execute_in_subshell (command, asynchronous, pipe_in, pipe_out, fds_to_close); | |
659 | if (s) | |
660 | subshell_exit (last_command_exit_value); | |
661 | else | |
a0c0a00f | 662 | sh_exit (last_command_exit_value); |
ac50fbac CR |
663 | /* NOTREACHED */ |
664 | } | |
726f6388 JA |
665 | else |
666 | { | |
667 | close_pipes (pipe_in, pipe_out); | |
668 | ||
669 | #if defined (PROCESS_SUBSTITUTION) && defined (HAVE_DEV_FD) | |
ac50fbac CR |
670 | if (variable_context == 0) /* wait until shell function completes */ |
671 | unlink_fifo_list (); | |
726f6388 JA |
672 | #endif |
673 | /* If we are part of a pipeline, and not the end of the pipeline, | |
674 | then we should simply return and let the last command in the | |
675 | pipe be waited for. If we are not in a pipeline, or are the | |
ccc6cda3 | 676 | last command in the pipeline, then we wait for the subshell |
726f6388 JA |
677 | and return its exit status as usual. */ |
678 | if (pipe_out != NO_PIPE) | |
679 | return (EXECUTION_SUCCESS); | |
680 | ||
681 | stop_pipeline (asynchronous, (COMMAND *)NULL); | |
682 | ||
8868edaf CR |
683 | line_number = save_line_number; |
684 | ||
ccc6cda3 | 685 | if (asynchronous == 0) |
726f6388 | 686 | { |
17345e5a JA |
687 | was_error_trap = signal_is_trapped (ERROR_TRAP) && signal_is_ignored (ERROR_TRAP) == 0; |
688 | invert = (command->flags & CMD_INVERT_RETURN) != 0; | |
689 | ignore_return = (command->flags & CMD_IGNORE_RETURN) != 0; | |
690 | ||
8868edaf | 691 | exec_result = wait_for (paren_pid, 0); |
726f6388 JA |
692 | |
693 | /* If we have to, invert the return value. */ | |
694 | if (invert) | |
495aee44 | 695 | exec_result = ((exec_result == EXECUTION_SUCCESS) |
bb70624e JA |
696 | ? EXECUTION_FAILURE |
697 | : EXECUTION_SUCCESS); | |
bb70624e | 698 | |
495aee44 | 699 | last_command_exit_value = exec_result; |
17345e5a JA |
700 | if (user_subshell && was_error_trap && ignore_return == 0 && invert == 0 && exec_result != EXECUTION_SUCCESS) |
701 | { | |
89a92869 CR |
702 | save_line_number = line_number; |
703 | line_number = line_number_for_err_trap; | |
17345e5a | 704 | run_error_trap (); |
89a92869 | 705 | line_number = save_line_number; |
17345e5a JA |
706 | } |
707 | ||
708 | if (user_subshell && ignore_return == 0 && invert == 0 && exit_immediately_on_error && exec_result != EXECUTION_SUCCESS) | |
709 | { | |
17345e5a JA |
710 | run_pending_traps (); |
711 | jump_to_top_level (ERREXIT); | |
712 | } | |
713 | ||
495aee44 | 714 | return (last_command_exit_value); |
726f6388 JA |
715 | } |
716 | else | |
717 | { | |
718 | DESCRIBE_PID (paren_pid); | |
719 | ||
720 | run_pending_traps (); | |
721 | ||
ac50fbac CR |
722 | /* Posix 2013 2.9.3.1: "the exit status of an asynchronous list |
723 | shall be zero." */ | |
724 | last_command_exit_value = 0; | |
726f6388 JA |
725 | return (EXECUTION_SUCCESS); |
726 | } | |
727 | } | |
728 | } | |
729 | ||
d166f048 JA |
730 | #if defined (COMMAND_TIMING) |
731 | if (command->flags & CMD_TIME_PIPELINE) | |
732 | { | |
733 | if (asynchronous) | |
734 | { | |
735 | command->flags |= CMD_FORCE_SUBSHELL; | |
736 | exec_result = execute_command_internal (command, 1, pipe_in, pipe_out, fds_to_close); | |
737 | } | |
738 | else | |
739 | { | |
740 | exec_result = time_command (command, asynchronous, pipe_in, pipe_out, fds_to_close); | |
b80f6443 | 741 | #if 0 |
d166f048 | 742 | if (running_trap == 0) |
b80f6443 | 743 | #endif |
d166f048 JA |
744 | currently_executing_command = (COMMAND *)NULL; |
745 | } | |
746 | return (exec_result); | |
747 | } | |
748 | #endif /* COMMAND_TIMING */ | |
749 | ||
750 | if (shell_control_structure (command->type) && command->redirects) | |
751 | stdin_redir = stdin_redirects (command->redirects); | |
752 | ||
ac50fbac | 753 | #if defined (PROCESS_SUBSTITUTION) |
d233b485 CR |
754 | # if !defined (HAVE_DEV_FD) |
755 | reap_procsubs (); | |
756 | # endif | |
757 | ||
9e49d343 | 758 | /* XXX - also if sourcelevel != 0? */ |
8868edaf | 759 | if (variable_context != 0 || executing_list) |
ac50fbac CR |
760 | { |
761 | ofifo = num_fifos (); | |
762 | ofifo_list = copy_fifo_list ((int *)&osize); | |
2fb21d75 | 763 | begin_unwind_frame ("internal_fifos"); |
9e49d343 CR |
764 | if (ofifo_list) |
765 | add_unwind_protect (xfree, ofifo_list); | |
ac50fbac CR |
766 | saved_fifo = 1; |
767 | } | |
768 | else | |
769 | saved_fifo = 0; | |
770 | #endif | |
771 | ||
726f6388 JA |
772 | /* Handle WHILE FOR CASE etc. with redirections. (Also '&' input |
773 | redirection.) */ | |
8868edaf CR |
774 | was_error_trap = signal_is_trapped (ERROR_TRAP) && signal_is_ignored (ERROR_TRAP) == 0; |
775 | ignore_return = (command->flags & CMD_IGNORE_RETURN) != 0; | |
776 | ||
b80f6443 | 777 | if (do_redirections (command->redirects, RX_ACTIVE|RX_UNDOABLE) != 0) |
726f6388 | 778 | { |
d233b485 | 779 | undo_partial_redirects (); |
726f6388 | 780 | dispose_exec_redirects (); |
ac50fbac CR |
781 | #if defined (PROCESS_SUBSTITUTION) |
782 | if (saved_fifo) | |
d233b485 | 783 | { |
2fb21d75 | 784 | free ((void *)ofifo_list); |
d233b485 CR |
785 | discard_unwind_frame ("internal_fifos"); |
786 | } | |
ac50fbac | 787 | #endif |
726f6388 | 788 | |
8868edaf CR |
789 | /* Handle redirection error as command failure if errexit set. */ |
790 | last_command_exit_value = EXECUTION_FAILURE; | |
791 | if (ignore_return == 0 && invert == 0 && pipe_in == NO_PIPE && pipe_out == NO_PIPE) | |
792 | { | |
793 | if (was_error_trap) | |
794 | { | |
795 | save_line_number = line_number; | |
796 | line_number = line_number_for_err_trap; | |
797 | run_error_trap (); | |
798 | line_number = save_line_number; | |
799 | } | |
800 | if (exit_immediately_on_error) | |
801 | { | |
802 | run_pending_traps (); | |
803 | jump_to_top_level (ERREXIT); | |
804 | } | |
805 | } | |
806 | return (last_command_exit_value); | |
726f6388 | 807 | } |
8868edaf | 808 | |
d233b485 CR |
809 | my_undo_list = redirection_undo_list; |
810 | redirection_undo_list = (REDIRECT *)NULL; | |
726f6388 | 811 | |
d233b485 CR |
812 | exec_undo_list = exec_redirection_undo_list; |
813 | exec_redirection_undo_list = (REDIRECT *)NULL; | |
726f6388 JA |
814 | |
815 | if (my_undo_list || exec_undo_list) | |
816 | begin_unwind_frame ("loop_redirections"); | |
817 | ||
818 | if (my_undo_list) | |
819 | add_unwind_protect ((Function *)cleanup_redirects, my_undo_list); | |
820 | ||
821 | if (exec_undo_list) | |
822 | add_unwind_protect ((Function *)dispose_redirects, exec_undo_list); | |
823 | ||
726f6388 JA |
824 | QUIT; |
825 | ||
826 | switch (command->type) | |
827 | { | |
ccc6cda3 JA |
828 | case cm_simple: |
829 | { | |
b80f6443 JA |
830 | save_line_number = line_number; |
831 | /* We can't rely on variables retaining their values across a | |
ccc6cda3 JA |
832 | call to execute_simple_command if a longjmp occurs as the |
833 | result of a `return' builtin. This is true for sure with gcc. */ | |
95732b49 JA |
834 | #if defined (RECYCLES_PIDS) |
835 | last_made_pid = NO_PID; | |
836 | #endif | |
f73dda09 | 837 | was_error_trap = signal_is_trapped (ERROR_TRAP) && signal_is_ignored (ERROR_TRAP) == 0; |
ccc6cda3 JA |
838 | |
839 | if (ignore_return && command->value.Simple) | |
840 | command->value.Simple->flags |= CMD_IGNORE_RETURN; | |
d166f048 JA |
841 | if (command->flags & CMD_STDIN_REDIR) |
842 | command->value.Simple->flags |= CMD_STDIN_REDIR; | |
b80f6443 | 843 | |
0628567a | 844 | line_number_for_err_trap = line_number = command->value.Simple->line; |
ccc6cda3 JA |
845 | exec_result = |
846 | execute_simple_command (command->value.Simple, pipe_in, pipe_out, | |
847 | asynchronous, fds_to_close); | |
b80f6443 | 848 | line_number = save_line_number; |
ccc6cda3 JA |
849 | |
850 | /* The temporary environment should be used for only the simple | |
851 | command immediately following its definition. */ | |
852 | dispose_used_env_vars (); | |
853 | ||
854 | #if (defined (ultrix) && defined (mips)) || defined (C_ALLOCA) | |
855 | /* Reclaim memory allocated with alloca () on machines which | |
856 | may be using the alloca emulation code. */ | |
857 | (void) alloca (0); | |
858 | #endif /* (ultrix && mips) || C_ALLOCA */ | |
859 | ||
860 | /* If we forked to do the command, then we must wait_for () | |
861 | the child. */ | |
862 | ||
863 | /* XXX - this is something to watch out for if there are problems | |
ac50fbac CR |
864 | when the shell is compiled without job control. Don't worry about |
865 | whether or not last_made_pid == last_pid; already_making_children | |
866 | tells us whether or not there are unwaited-for children to wait | |
867 | for and reap. */ | |
868 | if (already_making_children && pipe_out == NO_PIPE) | |
ccc6cda3 JA |
869 | { |
870 | stop_pipeline (asynchronous, (COMMAND *)NULL); | |
871 | ||
872 | if (asynchronous) | |
873 | { | |
874 | DESCRIBE_PID (last_made_pid); | |
a0c0a00f CR |
875 | exec_result = EXECUTION_SUCCESS; |
876 | invert = 0; /* async commands always succeed */ | |
ccc6cda3 JA |
877 | } |
878 | else | |
879 | #if !defined (JOB_CONTROL) | |
880 | /* Do not wait for asynchronous processes started from | |
881 | startup files. */ | |
a0c0a00f CR |
882 | if (last_made_pid != NO_PID && last_made_pid != last_asynchronous_pid) |
883 | #else | |
884 | if (last_made_pid != NO_PID) | |
ccc6cda3 JA |
885 | #endif |
886 | /* When executing a shell function that executes other | |
887 | commands, this causes the last simple command in | |
b80f6443 JA |
888 | the function to be waited for twice. This also causes |
889 | subshells forked to execute builtin commands (e.g., in | |
890 | pipelines) to be waited for twice. */ | |
8868edaf | 891 | exec_result = wait_for (last_made_pid, 0); |
ccc6cda3 JA |
892 | } |
893 | } | |
894 | ||
17345e5a | 895 | /* 2009/02/13 -- pipeline failure is processed elsewhere. This handles |
d233b485 CR |
896 | only the failure of a simple command. We don't want to run the error |
897 | trap if the command run by the `command' builtin fails; we want to | |
898 | defer that until the command builtin itself returns failure. */ | |
8868edaf | 899 | /* 2020/07/14 -- this changes with how the command builtin is handled */ |
d233b485 CR |
900 | if (was_error_trap && ignore_return == 0 && invert == 0 && |
901 | pipe_in == NO_PIPE && pipe_out == NO_PIPE && | |
902 | (command->value.Simple->flags & CMD_COMMAND_BUILTIN) == 0 && | |
903 | exec_result != EXECUTION_SUCCESS) | |
f73dda09 JA |
904 | { |
905 | last_command_exit_value = exec_result; | |
89a92869 | 906 | line_number = line_number_for_err_trap; |
f73dda09 | 907 | run_error_trap (); |
89a92869 | 908 | line_number = save_line_number; |
f73dda09 JA |
909 | } |
910 | ||
ccc6cda3 | 911 | if (ignore_return == 0 && invert == 0 && |
cce855bc | 912 | ((posixly_correct && interactive == 0 && special_builtin_failed) || |
3185942a | 913 | (exit_immediately_on_error && pipe_in == NO_PIPE && pipe_out == NO_PIPE && exec_result != EXECUTION_SUCCESS))) |
ccc6cda3 JA |
914 | { |
915 | last_command_exit_value = exec_result; | |
916 | run_pending_traps (); | |
a0c0a00f CR |
917 | |
918 | /* Undo redirections before running exit trap on the way out of | |
919 | set -e. Report by Mark Farrell 5/19/2014 */ | |
920 | if (exit_immediately_on_error && signal_is_trapped (0) && | |
921 | unwind_protect_tag_on_stack ("saved-redirects")) | |
922 | run_unwind_frame ("saved-redirects"); | |
923 | ||
b80f6443 | 924 | jump_to_top_level (ERREXIT); |
ccc6cda3 JA |
925 | } |
926 | ||
927 | break; | |
928 | ||
726f6388 JA |
929 | case cm_for: |
930 | if (ignore_return) | |
931 | command->value.For->flags |= CMD_IGNORE_RETURN; | |
932 | exec_result = execute_for_command (command->value.For); | |
933 | break; | |
934 | ||
bb70624e JA |
935 | #if defined (ARITH_FOR_COMMAND) |
936 | case cm_arith_for: | |
937 | if (ignore_return) | |
938 | command->value.ArithFor->flags |= CMD_IGNORE_RETURN; | |
939 | exec_result = execute_arith_for_command (command->value.ArithFor); | |
940 | break; | |
941 | #endif | |
942 | ||
726f6388 JA |
943 | #if defined (SELECT_COMMAND) |
944 | case cm_select: | |
945 | if (ignore_return) | |
946 | command->value.Select->flags |= CMD_IGNORE_RETURN; | |
947 | exec_result = execute_select_command (command->value.Select); | |
948 | break; | |
949 | #endif | |
950 | ||
951 | case cm_case: | |
952 | if (ignore_return) | |
953 | command->value.Case->flags |= CMD_IGNORE_RETURN; | |
954 | exec_result = execute_case_command (command->value.Case); | |
955 | break; | |
956 | ||
957 | case cm_while: | |
958 | if (ignore_return) | |
959 | command->value.While->flags |= CMD_IGNORE_RETURN; | |
960 | exec_result = execute_while_command (command->value.While); | |
961 | break; | |
962 | ||
963 | case cm_until: | |
964 | if (ignore_return) | |
965 | command->value.While->flags |= CMD_IGNORE_RETURN; | |
966 | exec_result = execute_until_command (command->value.While); | |
967 | break; | |
968 | ||
969 | case cm_if: | |
970 | if (ignore_return) | |
971 | command->value.If->flags |= CMD_IGNORE_RETURN; | |
972 | exec_result = execute_if_command (command->value.If); | |
973 | break; | |
974 | ||
975 | case cm_group: | |
976 | ||
977 | /* This code can be executed from either of two paths: an explicit | |
978 | '{}' command, or via a function call. If we are executed via a | |
979 | function call, we have already taken care of the function being | |
980 | executed in the background (down there in execute_simple_command ()), | |
981 | and this command should *not* be marked as asynchronous. If we | |
982 | are executing a regular '{}' group command, and asynchronous == 1, | |
983 | we must want to execute the whole command in the background, so we | |
984 | need a subshell, and we want the stuff executed in that subshell | |
985 | (this group command) to be executed in the foreground of that | |
986 | subshell (i.e. there will not be *another* subshell forked). | |
987 | ||
988 | What we do is to force a subshell if asynchronous, and then call | |
989 | execute_command_internal again with asynchronous still set to 1, | |
990 | but with the original group command, so the printed command will | |
991 | look right. | |
992 | ||
993 | The code above that handles forking off subshells will note that | |
994 | both subshell and async are on, and turn off async in the child | |
995 | after forking the subshell (but leave async set in the parent, so | |
996 | the normal call to describe_pid is made). This turning off | |
997 | async is *crucial*; if it is not done, this will fall into an | |
998 | infinite loop of executions through this spot in subshell after | |
999 | subshell until the process limit is exhausted. */ | |
1000 | ||
1001 | if (asynchronous) | |
1002 | { | |
1003 | command->flags |= CMD_FORCE_SUBSHELL; | |
1004 | exec_result = | |
1005 | execute_command_internal (command, 1, pipe_in, pipe_out, | |
1006 | fds_to_close); | |
1007 | } | |
1008 | else | |
1009 | { | |
1010 | if (ignore_return && command->value.Group->command) | |
1011 | command->value.Group->command->flags |= CMD_IGNORE_RETURN; | |
1012 | exec_result = | |
1013 | execute_command_internal (command->value.Group->command, | |
1014 | asynchronous, pipe_in, pipe_out, | |
1015 | fds_to_close); | |
1016 | } | |
1017 | break; | |
1018 | ||
ccc6cda3 JA |
1019 | case cm_connection: |
1020 | exec_result = execute_connection (command, asynchronous, | |
1021 | pipe_in, pipe_out, fds_to_close); | |
a0c0a00f CR |
1022 | if (asynchronous) |
1023 | invert = 0; /* XXX */ | |
1024 | ||
ccc6cda3 | 1025 | break; |
726f6388 | 1026 | |
cce855bc JA |
1027 | #if defined (DPAREN_ARITHMETIC) |
1028 | case cm_arith: | |
cce855bc | 1029 | #endif |
cce855bc JA |
1030 | #if defined (COND_COMMAND) |
1031 | case cm_cond: | |
8868edaf CR |
1032 | #endif |
1033 | case cm_function_def: | |
0001803f | 1034 | was_error_trap = signal_is_trapped (ERROR_TRAP) && signal_is_ignored (ERROR_TRAP) == 0; |
8868edaf CR |
1035 | #if defined (DPAREN_ARITHMETIC) |
1036 | if (ignore_return && command->type == cm_arith) | |
1037 | command->value.Arith->flags |= CMD_IGNORE_RETURN; | |
1038 | #endif | |
1039 | #if defined (COND_COMMAND) | |
1040 | if (ignore_return && command->type == cm_cond) | |
cce855bc | 1041 | command->value.Cond->flags |= CMD_IGNORE_RETURN; |
8868edaf | 1042 | #endif |
0001803f CR |
1043 | |
1044 | line_number_for_err_trap = save_line_number = line_number; | |
8868edaf CR |
1045 | #if defined (DPAREN_ARITHMETIC) |
1046 | if (command->type == cm_arith) | |
1047 | exec_result = execute_arith_command (command->value.Arith); | |
1048 | else | |
1049 | #endif | |
1050 | #if defined (COND_COMMAND) | |
1051 | if (command->type == cm_cond) | |
1052 | exec_result = execute_cond_command (command->value.Cond); | |
1053 | else | |
1054 | #endif | |
1055 | if (command->type == cm_function_def) | |
1056 | exec_result = execute_intern_function (command->value.Function_def->name, | |
1057 | command->value.Function_def); | |
b80f6443 | 1058 | line_number = save_line_number; |
0001803f CR |
1059 | |
1060 | if (was_error_trap && ignore_return == 0 && invert == 0 && exec_result != EXECUTION_SUCCESS) | |
1061 | { | |
1062 | last_command_exit_value = exec_result; | |
1063 | save_line_number = line_number; | |
1064 | line_number = line_number_for_err_trap; | |
1065 | run_error_trap (); | |
1066 | line_number = save_line_number; | |
1067 | } | |
1068 | ||
1069 | if (ignore_return == 0 && invert == 0 && exit_immediately_on_error && exec_result != EXECUTION_SUCCESS) | |
1070 | { | |
1071 | last_command_exit_value = exec_result; | |
1072 | run_pending_traps (); | |
1073 | jump_to_top_level (ERREXIT); | |
1074 | } | |
1075 | ||
cce855bc | 1076 | break; |
726f6388 | 1077 | |
ccc6cda3 | 1078 | default: |
b72432fd | 1079 | command_error ("execute_command", CMDERR_BADTYPE, command->type, 0); |
ccc6cda3 | 1080 | } |
726f6388 | 1081 | |
ccc6cda3 | 1082 | if (my_undo_list) |
d233b485 | 1083 | cleanup_redirects (my_undo_list); |
726f6388 | 1084 | |
ccc6cda3 JA |
1085 | if (exec_undo_list) |
1086 | dispose_redirects (exec_undo_list); | |
726f6388 | 1087 | |
ccc6cda3 JA |
1088 | if (my_undo_list || exec_undo_list) |
1089 | discard_unwind_frame ("loop_redirections"); | |
726f6388 | 1090 | |
ac50fbac CR |
1091 | #if defined (PROCESS_SUBSTITUTION) |
1092 | if (saved_fifo) | |
1093 | { | |
1094 | nfifo = num_fifos (); | |
1095 | if (nfifo > ofifo) | |
9e49d343 | 1096 | close_new_fifos ((void *)ofifo_list, osize); |
ac50fbac | 1097 | free ((void *)ofifo_list); |
2fb21d75 | 1098 | discard_unwind_frame ("internal_fifos"); |
ac50fbac CR |
1099 | } |
1100 | #endif | |
1101 | ||
ccc6cda3 JA |
1102 | /* Invert the return value if we have to */ |
1103 | if (invert) | |
1104 | exec_result = (exec_result == EXECUTION_SUCCESS) | |
1105 | ? EXECUTION_FAILURE | |
1106 | : EXECUTION_SUCCESS; | |
726f6388 | 1107 | |
0628567a JA |
1108 | #if defined (DPAREN_ARITHMETIC) || defined (COND_COMMAND) |
1109 | /* This is where we set PIPESTATUS from the exit status of the appropriate | |
1110 | compound commands (the ones that look enough like simple commands to | |
1111 | cause confusion). We might be able to optimize by not doing this if | |
1112 | subshell_environment != 0. */ | |
1113 | switch (command->type) | |
1114 | { | |
1115 | # if defined (DPAREN_ARITHMETIC) | |
1116 | case cm_arith: | |
1117 | # endif | |
1118 | # if defined (COND_COMMAND) | |
1119 | case cm_cond: | |
1120 | # endif | |
1121 | set_pipestatus_from_exit (exec_result); | |
1122 | break; | |
d233b485 CR |
1123 | default: |
1124 | break; | |
0628567a JA |
1125 | } |
1126 | #endif | |
1127 | ||
ccc6cda3 JA |
1128 | last_command_exit_value = exec_result; |
1129 | run_pending_traps (); | |
8868edaf | 1130 | currently_executing_command = (COMMAND *)NULL; |
ac50fbac | 1131 | |
ccc6cda3 JA |
1132 | return (last_command_exit_value); |
1133 | } | |
726f6388 | 1134 | |
ccc6cda3 | 1135 | #if defined (COMMAND_TIMING) |
726f6388 | 1136 | |
bb70624e | 1137 | #if defined (HAVE_GETRUSAGE) && defined (HAVE_GETTIMEOFDAY) |
8868edaf CR |
1138 | extern struct timeval *difftimeval PARAMS((struct timeval *, struct timeval *, struct timeval *)); |
1139 | extern struct timeval *addtimeval PARAMS((struct timeval *, struct timeval *, struct timeval *)); | |
1140 | extern int timeval_to_cpu PARAMS((struct timeval *, struct timeval *, struct timeval *)); | |
bb70624e | 1141 | #endif |
726f6388 | 1142 | |
ccc6cda3 JA |
1143 | #define POSIX_TIMEFORMAT "real %2R\nuser %2U\nsys %2S" |
1144 | #define BASH_TIMEFORMAT "\nreal\t%3lR\nuser\t%3lU\nsys\t%3lS" | |
726f6388 | 1145 | |
3185942a | 1146 | static const int precs[] = { 0, 100, 10, 1 }; |
726f6388 | 1147 | |
ccc6cda3 JA |
1148 | /* Expand one `%'-prefixed escape sequence from a time format string. */ |
1149 | static int | |
1150 | mkfmt (buf, prec, lng, sec, sec_fraction) | |
1151 | char *buf; | |
1152 | int prec, lng; | |
f73dda09 | 1153 | time_t sec; |
ccc6cda3 JA |
1154 | int sec_fraction; |
1155 | { | |
f73dda09 JA |
1156 | time_t min; |
1157 | char abuf[INT_STRLEN_BOUND(time_t) + 1]; | |
ccc6cda3 | 1158 | int ind, aind; |
726f6388 | 1159 | |
ccc6cda3 | 1160 | ind = 0; |
f73dda09 | 1161 | abuf[sizeof(abuf) - 1] = '\0'; |
726f6388 | 1162 | |
ccc6cda3 JA |
1163 | /* If LNG is non-zero, we want to decompose SEC into minutes and seconds. */ |
1164 | if (lng) | |
1165 | { | |
1166 | min = sec / 60; | |
1167 | sec %= 60; | |
f73dda09 | 1168 | aind = sizeof(abuf) - 2; |
ccc6cda3 JA |
1169 | do |
1170 | abuf[aind--] = (min % 10) + '0'; | |
1171 | while (min /= 10); | |
1172 | aind++; | |
1173 | while (abuf[aind]) | |
cce855bc | 1174 | buf[ind++] = abuf[aind++]; |
ccc6cda3 JA |
1175 | buf[ind++] = 'm'; |
1176 | } | |
726f6388 | 1177 | |
ccc6cda3 | 1178 | /* Now add the seconds. */ |
f73dda09 | 1179 | aind = sizeof (abuf) - 2; |
ccc6cda3 JA |
1180 | do |
1181 | abuf[aind--] = (sec % 10) + '0'; | |
1182 | while (sec /= 10); | |
1183 | aind++; | |
1184 | while (abuf[aind]) | |
1185 | buf[ind++] = abuf[aind++]; | |
1186 | ||
1187 | /* We want to add a decimal point and PREC places after it if PREC is | |
1188 | nonzero. PREC is not greater than 3. SEC_FRACTION is between 0 | |
1189 | and 999. */ | |
1190 | if (prec != 0) | |
1191 | { | |
d233b485 | 1192 | buf[ind++] = locale_decpoint (); |
ccc6cda3 JA |
1193 | for (aind = 1; aind <= prec; aind++) |
1194 | { | |
1195 | buf[ind++] = (sec_fraction / precs[aind]) + '0'; | |
1196 | sec_fraction %= precs[aind]; | |
1197 | } | |
1198 | } | |
726f6388 | 1199 | |
ccc6cda3 JA |
1200 | if (lng) |
1201 | buf[ind++] = 's'; | |
1202 | buf[ind] = '\0'; | |
726f6388 | 1203 | |
ccc6cda3 JA |
1204 | return (ind); |
1205 | } | |
726f6388 | 1206 | |
ccc6cda3 JA |
1207 | /* Interpret the format string FORMAT, interpolating the following escape |
1208 | sequences: | |
7117c2d2 | 1209 | %[prec][l][RUS] |
ccc6cda3 JA |
1210 | |
1211 | where the optional `prec' is a precision, meaning the number of | |
1212 | characters after the decimal point, the optional `l' means to format | |
1213 | using minutes and seconds (MMmNN[.FF]s), like the `times' builtin', | |
1214 | and the last character is one of | |
1215 | ||
7117c2d2 JA |
1216 | R number of seconds of `real' time |
1217 | U number of seconds of `user' time | |
1218 | S number of seconds of `system' time | |
ccc6cda3 JA |
1219 | |
1220 | An occurrence of `%%' in the format string is translated to a `%'. The | |
1221 | result is printed to FP, a pointer to a FILE. The other variables are | |
1222 | the seconds and thousandths of a second of real, user, and system time, | |
1223 | resectively. */ | |
1224 | static void | |
1225 | print_formatted_time (fp, format, rs, rsf, us, usf, ss, ssf, cpu) | |
1226 | FILE *fp; | |
1227 | char *format; | |
f73dda09 JA |
1228 | time_t rs; |
1229 | int rsf; | |
1230 | time_t us; | |
1231 | int usf; | |
1232 | time_t ss; | |
1233 | int ssf, cpu; | |
ccc6cda3 JA |
1234 | { |
1235 | int prec, lng, len; | |
f73dda09 JA |
1236 | char *str, *s, ts[INT_STRLEN_BOUND (time_t) + sizeof ("mSS.FFFF")]; |
1237 | time_t sum; | |
e8ce775d | 1238 | int sum_frac; |
ccc6cda3 | 1239 | int sindex, ssize; |
726f6388 | 1240 | |
ccc6cda3 JA |
1241 | len = strlen (format); |
1242 | ssize = (len + 64) - (len % 64); | |
f73dda09 | 1243 | str = (char *)xmalloc (ssize); |
ccc6cda3 JA |
1244 | sindex = 0; |
1245 | ||
1246 | for (s = format; *s; s++) | |
1247 | { | |
1248 | if (*s != '%' || s[1] == '\0') | |
cce855bc JA |
1249 | { |
1250 | RESIZE_MALLOCED_BUFFER (str, sindex, 1, ssize, 64); | |
1251 | str[sindex++] = *s; | |
1252 | } | |
ccc6cda3 | 1253 | else if (s[1] == '%') |
cce855bc JA |
1254 | { |
1255 | s++; | |
1256 | RESIZE_MALLOCED_BUFFER (str, sindex, 1, ssize, 64); | |
1257 | str[sindex++] = *s; | |
1258 | } | |
ccc6cda3 JA |
1259 | else if (s[1] == 'P') |
1260 | { | |
1261 | s++; | |
17345e5a JA |
1262 | #if 0 |
1263 | /* clamp CPU usage at 100% */ | |
ccc6cda3 JA |
1264 | if (cpu > 10000) |
1265 | cpu = 10000; | |
17345e5a | 1266 | #endif |
ccc6cda3 JA |
1267 | sum = cpu / 100; |
1268 | sum_frac = (cpu % 100) * 10; | |
1269 | len = mkfmt (ts, 2, 0, sum, sum_frac); | |
1270 | RESIZE_MALLOCED_BUFFER (str, sindex, len, ssize, 64); | |
1271 | strcpy (str + sindex, ts); | |
1272 | sindex += len; | |
1273 | } | |
1274 | else | |
1275 | { | |
1276 | prec = 3; /* default is three places past the decimal point. */ | |
1277 | lng = 0; /* default is to not use minutes or append `s' */ | |
1278 | s++; | |
f73dda09 | 1279 | if (DIGIT (*s)) /* `precision' */ |
726f6388 | 1280 | { |
ccc6cda3 JA |
1281 | prec = *s++ - '0'; |
1282 | if (prec > 3) prec = 3; | |
726f6388 | 1283 | } |
ccc6cda3 JA |
1284 | if (*s == 'l') /* `length extender' */ |
1285 | { | |
1286 | lng = 1; | |
1287 | s++; | |
1288 | } | |
1289 | if (*s == 'R' || *s == 'E') | |
1290 | len = mkfmt (ts, prec, lng, rs, rsf); | |
1291 | else if (*s == 'U') | |
1292 | len = mkfmt (ts, prec, lng, us, usf); | |
1293 | else if (*s == 'S') | |
1294 | len = mkfmt (ts, prec, lng, ss, ssf); | |
1295 | else | |
1296 | { | |
b80f6443 | 1297 | internal_error (_("TIMEFORMAT: `%c': invalid format character"), *s); |
ccc6cda3 JA |
1298 | free (str); |
1299 | return; | |
1300 | } | |
1301 | RESIZE_MALLOCED_BUFFER (str, sindex, len, ssize, 64); | |
1302 | strcpy (str + sindex, ts); | |
1303 | sindex += len; | |
1304 | } | |
1305 | } | |
1306 | ||
1307 | str[sindex] = '\0'; | |
1308 | fprintf (fp, "%s\n", str); | |
1309 | fflush (fp); | |
1310 | ||
1311 | free (str); | |
1312 | } | |
1313 | ||
1314 | static int | |
1315 | time_command (command, asynchronous, pipe_in, pipe_out, fds_to_close) | |
1316 | COMMAND *command; | |
1317 | int asynchronous, pipe_in, pipe_out; | |
1318 | struct fd_bitmap *fds_to_close; | |
1319 | { | |
a0c0a00f | 1320 | int rv, posix_time, old_flags, nullcmd, code; |
f73dda09 | 1321 | time_t rs, us, ss; |
ccc6cda3 JA |
1322 | int rsf, usf, ssf; |
1323 | int cpu; | |
1324 | char *time_format; | |
a0c0a00f | 1325 | volatile procenv_t save_top_level; |
ccc6cda3 JA |
1326 | |
1327 | #if defined (HAVE_GETRUSAGE) && defined (HAVE_GETTIMEOFDAY) | |
1328 | struct timeval real, user, sys; | |
1329 | struct timeval before, after; | |
b80f6443 JA |
1330 | # if defined (HAVE_STRUCT_TIMEZONE) |
1331 | struct timezone dtz; /* posix doesn't define this */ | |
1332 | # endif | |
ccc6cda3 JA |
1333 | struct rusage selfb, selfa, kidsb, kidsa; /* a = after, b = before */ |
1334 | #else | |
1335 | # if defined (HAVE_TIMES) | |
1336 | clock_t tbefore, tafter, real, user, sys; | |
1337 | struct tms before, after; | |
1338 | # endif | |
1339 | #endif | |
1340 | ||
1341 | #if defined (HAVE_GETRUSAGE) && defined (HAVE_GETTIMEOFDAY) | |
b80f6443 | 1342 | # if defined (HAVE_STRUCT_TIMEZONE) |
ccc6cda3 | 1343 | gettimeofday (&before, &dtz); |
b80f6443 JA |
1344 | # else |
1345 | gettimeofday (&before, (void *)NULL); | |
1346 | # endif /* !HAVE_STRUCT_TIMEZONE */ | |
ccc6cda3 JA |
1347 | getrusage (RUSAGE_SELF, &selfb); |
1348 | getrusage (RUSAGE_CHILDREN, &kidsb); | |
1349 | #else | |
1350 | # if defined (HAVE_TIMES) | |
1351 | tbefore = times (&before); | |
1352 | # endif | |
1353 | #endif | |
1354 | ||
ac50fbac | 1355 | posix_time = command && (command->flags & CMD_TIME_POSIX); |
ccc6cda3 | 1356 | |
495aee44 CR |
1357 | nullcmd = (command == 0) || (command->type == cm_simple && command->value.Simple->words == 0 && command->value.Simple->redirects == 0); |
1358 | if (posixly_correct && nullcmd) | |
1359 | { | |
1360 | #if defined (HAVE_GETRUSAGE) | |
1361 | selfb.ru_utime.tv_sec = kidsb.ru_utime.tv_sec = selfb.ru_stime.tv_sec = kidsb.ru_stime.tv_sec = 0; | |
1362 | selfb.ru_utime.tv_usec = kidsb.ru_utime.tv_usec = selfb.ru_stime.tv_usec = kidsb.ru_stime.tv_usec = 0; | |
8868edaf | 1363 | before = shellstart; |
495aee44 CR |
1364 | #else |
1365 | before.tms_utime = before.tms_stime = before.tms_cutime = before.tms_cstime = 0; | |
1366 | tbefore = shell_start_time; | |
1367 | #endif | |
1368 | } | |
1369 | ||
d166f048 | 1370 | old_flags = command->flags; |
a0c0a00f | 1371 | COPY_PROCENV (top_level, save_top_level); |
ccc6cda3 | 1372 | command->flags &= ~(CMD_TIME_PIPELINE|CMD_TIME_POSIX); |
a0c0a00f CR |
1373 | code = setjmp_nosigs (top_level); |
1374 | if (code == NOT_JUMPED) | |
d233b485 CR |
1375 | { |
1376 | rv = execute_command_internal (command, asynchronous, pipe_in, pipe_out, fds_to_close); | |
1377 | command->flags = old_flags; | |
1378 | } | |
a0c0a00f | 1379 | COPY_PROCENV (save_top_level, top_level); |
ccc6cda3 | 1380 | |
f73dda09 | 1381 | rs = us = ss = 0; |
cce855bc JA |
1382 | rsf = usf = ssf = cpu = 0; |
1383 | ||
ccc6cda3 | 1384 | #if defined (HAVE_GETRUSAGE) && defined (HAVE_GETTIMEOFDAY) |
b80f6443 | 1385 | # if defined (HAVE_STRUCT_TIMEZONE) |
ccc6cda3 | 1386 | gettimeofday (&after, &dtz); |
b80f6443 JA |
1387 | # else |
1388 | gettimeofday (&after, (void *)NULL); | |
1389 | # endif /* !HAVE_STRUCT_TIMEZONE */ | |
ccc6cda3 JA |
1390 | getrusage (RUSAGE_SELF, &selfa); |
1391 | getrusage (RUSAGE_CHILDREN, &kidsa); | |
1392 | ||
1393 | difftimeval (&real, &before, &after); | |
1394 | timeval_to_secs (&real, &rs, &rsf); | |
1395 | ||
1396 | addtimeval (&user, difftimeval(&after, &selfb.ru_utime, &selfa.ru_utime), | |
1397 | difftimeval(&before, &kidsb.ru_utime, &kidsa.ru_utime)); | |
1398 | timeval_to_secs (&user, &us, &usf); | |
1399 | ||
1400 | addtimeval (&sys, difftimeval(&after, &selfb.ru_stime, &selfa.ru_stime), | |
1401 | difftimeval(&before, &kidsb.ru_stime, &kidsa.ru_stime)); | |
1402 | timeval_to_secs (&sys, &ss, &ssf); | |
1403 | ||
1404 | cpu = timeval_to_cpu (&real, &user, &sys); | |
1405 | #else | |
1406 | # if defined (HAVE_TIMES) | |
1407 | tafter = times (&after); | |
1408 | ||
1409 | real = tafter - tbefore; | |
1410 | clock_t_to_secs (real, &rs, &rsf); | |
1411 | ||
1412 | user = (after.tms_utime - before.tms_utime) + (after.tms_cutime - before.tms_cutime); | |
1413 | clock_t_to_secs (user, &us, &usf); | |
1414 | ||
1415 | sys = (after.tms_stime - before.tms_stime) + (after.tms_cstime - before.tms_cstime); | |
1416 | clock_t_to_secs (sys, &ss, &ssf); | |
1417 | ||
d166f048 | 1418 | cpu = (real == 0) ? 0 : ((user + sys) * 10000) / real; |
ccc6cda3 JA |
1419 | |
1420 | # else | |
f73dda09 | 1421 | rs = us = ss = 0; |
ccc6cda3 JA |
1422 | rsf = usf = ssf = cpu = 0; |
1423 | # endif | |
1424 | #endif | |
1425 | ||
1426 | if (posix_time) | |
1427 | time_format = POSIX_TIMEFORMAT; | |
1428 | else if ((time_format = get_string_value ("TIMEFORMAT")) == 0) | |
495aee44 CR |
1429 | { |
1430 | if (posixly_correct && nullcmd) | |
1431 | time_format = "user\t%2lU\nsys\t%2lS"; | |
1432 | else | |
1433 | time_format = BASH_TIMEFORMAT; | |
1434 | } | |
d233b485 | 1435 | |
ccc6cda3 JA |
1436 | if (time_format && *time_format) |
1437 | print_formatted_time (stderr, time_format, rs, rsf, us, usf, ss, ssf, cpu); | |
1438 | ||
a0c0a00f CR |
1439 | if (code) |
1440 | sh_longjmp (top_level, code); | |
1441 | ||
ccc6cda3 JA |
1442 | return rv; |
1443 | } | |
1444 | #endif /* COMMAND_TIMING */ | |
1445 | ||
bb70624e | 1446 | /* Execute a command that's supposed to be in a subshell. This must be |
28ef6c31 JA |
1447 | called after make_child and we must be running in the child process. |
1448 | The caller will return or exit() immediately with the value this returns. */ | |
bb70624e JA |
1449 | static int |
1450 | execute_in_subshell (command, asynchronous, pipe_in, pipe_out, fds_to_close) | |
1451 | COMMAND *command; | |
1452 | int asynchronous; | |
1453 | int pipe_in, pipe_out; | |
1454 | struct fd_bitmap *fds_to_close; | |
1455 | { | |
d233b485 CR |
1456 | volatile int user_subshell, user_coproc, invert; |
1457 | int return_code, function_value, should_redir_stdin, ois, result; | |
495aee44 | 1458 | volatile COMMAND *tcom; |
bb70624e | 1459 | |
f73dda09 | 1460 | USE_VAR(user_subshell); |
3185942a | 1461 | USE_VAR(user_coproc); |
f73dda09 JA |
1462 | USE_VAR(invert); |
1463 | USE_VAR(tcom); | |
1464 | USE_VAR(asynchronous); | |
1465 | ||
b80f6443 | 1466 | subshell_level++; |
bb70624e JA |
1467 | should_redir_stdin = (asynchronous && (command->flags & CMD_STDIN_REDIR) && |
1468 | pipe_in == NO_PIPE && | |
1469 | stdin_redirects (command->redirects) == 0); | |
1470 | ||
28ef6c31 | 1471 | invert = (command->flags & CMD_INVERT_RETURN) != 0; |
bb70624e | 1472 | user_subshell = command->type == cm_subshell || ((command->flags & CMD_WANT_SUBSHELL) != 0); |
3185942a | 1473 | user_coproc = command->type == cm_coproc; |
28ef6c31 | 1474 | |
bb70624e JA |
1475 | command->flags &= ~(CMD_FORCE_SUBSHELL | CMD_WANT_SUBSHELL | CMD_INVERT_RETURN); |
1476 | ||
1477 | /* If a command is asynchronous in a subshell (like ( foo ) & or | |
1478 | the special case of an asynchronous GROUP command where the | |
1479 | the subshell bit is turned on down in case cm_group: below), | |
1480 | turn off `asynchronous', so that two subshells aren't spawned. | |
0628567a JA |
1481 | XXX - asynchronous used to be set to 0 in this block, but that |
1482 | means that setup_async_signals was never run. Now it's set to | |
1483 | 0 after subshell_environment is set appropriately and setup_async_signals | |
1484 | is run. | |
bb70624e JA |
1485 | |
1486 | This seems semantically correct to me. For example, | |
1487 | ( foo ) & seems to say ``do the command `foo' in a subshell | |
1488 | environment, but don't wait for that subshell to finish'', | |
1489 | and "{ foo ; bar ; } &" seems to me to be like functions or | |
1490 | builtins in the background, which executed in a subshell | |
1491 | environment. I just don't see the need to fork two subshells. */ | |
1492 | ||
1493 | /* Don't fork again, we are already in a subshell. A `doubly | |
1494 | async' shell is not interactive, however. */ | |
1495 | if (asynchronous) | |
1496 | { | |
1497 | #if defined (JOB_CONTROL) | |
1498 | /* If a construct like ( exec xxx yyy ) & is given while job | |
1499 | control is active, we want to prevent exec from putting the | |
1500 | subshell back into the original process group, carefully | |
1501 | undoing all the work we just did in make_child. */ | |
1502 | original_pgrp = -1; | |
1503 | #endif /* JOB_CONTROL */ | |
28ef6c31 | 1504 | ois = interactive_shell; |
bb70624e | 1505 | interactive_shell = 0; |
28ef6c31 JA |
1506 | /* This test is to prevent alias expansion by interactive shells that |
1507 | run `(command) &' but to allow scripts that have enabled alias | |
1508 | expansion with `shopt -s expand_alias' to continue to expand | |
1509 | aliases. */ | |
1510 | if (ois != interactive_shell) | |
1511 | expand_aliases = 0; | |
bb70624e JA |
1512 | } |
1513 | ||
1514 | /* Subshells are neither login nor interactive. */ | |
1515 | login_shell = interactive = 0; | |
1516 | ||
d233b485 CR |
1517 | /* And we're no longer in a loop. See Posix interp 842 (we are not in the |
1518 | "same execution environment"). */ | |
1519 | if (shell_compatibility_level > 44) | |
1520 | loop_level = 0; | |
1521 | ||
0628567a | 1522 | if (user_subshell) |
d233b485 CR |
1523 | { |
1524 | subshell_environment = SUBSHELL_PAREN; /* XXX */ | |
1525 | if (asynchronous) | |
1526 | subshell_environment |= SUBSHELL_ASYNC; | |
1527 | } | |
0628567a JA |
1528 | else |
1529 | { | |
1530 | subshell_environment = 0; /* XXX */ | |
1531 | if (asynchronous) | |
1532 | subshell_environment |= SUBSHELL_ASYNC; | |
1533 | if (pipe_in != NO_PIPE || pipe_out != NO_PIPE) | |
1534 | subshell_environment |= SUBSHELL_PIPE; | |
3185942a JA |
1535 | if (user_coproc) |
1536 | subshell_environment |= SUBSHELL_COPROC; | |
0628567a | 1537 | } |
bb70624e | 1538 | |
8868edaf CR |
1539 | QUIT; |
1540 | CHECK_TERMSIG; | |
1541 | ||
bb70624e JA |
1542 | reset_terminating_signals (); /* in sig.c */ |
1543 | /* Cancel traps, in trap.c. */ | |
495aee44 CR |
1544 | /* Reset the signal handlers in the child, but don't free the |
1545 | trap strings. Set a flag noting that we have to free the | |
1546 | trap strings if we run trap to change a signal disposition. */ | |
8868edaf | 1547 | clear_pending_traps (); |
495aee44 CR |
1548 | reset_signal_handlers (); |
1549 | subshell_environment |= SUBSHELL_RESETTRAP; | |
8868edaf | 1550 | |
d233b485 CR |
1551 | /* We are in a subshell, so forget that we are running a trap handler or |
1552 | that the signal handler has changed (we haven't changed it!) */ | |
1553 | if (running_trap > 0) | |
1554 | { | |
1555 | run_trap_cleanup (running_trap - 1); | |
8868edaf | 1556 | running_trap = 0; /* XXX - maybe leave this */ |
d233b485 | 1557 | } |
0628567a JA |
1558 | |
1559 | /* Make sure restore_original_signals doesn't undo the work done by | |
1560 | make_child to ensure that asynchronous children are immune to SIGINT | |
1561 | and SIGQUIT. Turn off asynchronous to make sure more subshells are | |
1562 | not spawned. */ | |
bb70624e | 1563 | if (asynchronous) |
0628567a JA |
1564 | { |
1565 | setup_async_signals (); | |
1566 | asynchronous = 0; | |
1567 | } | |
d233b485 CR |
1568 | else |
1569 | set_sigint_handler (); | |
bb70624e JA |
1570 | |
1571 | #if defined (JOB_CONTROL) | |
1572 | set_sigchld_handler (); | |
1573 | #endif /* JOB_CONTROL */ | |
1574 | ||
bb70624e JA |
1575 | /* Delete all traces that there were any jobs running. This is |
1576 | only for subshells. */ | |
1577 | without_job_control (); | |
bb70624e JA |
1578 | |
1579 | if (fds_to_close) | |
1580 | close_fd_bitmap (fds_to_close); | |
1581 | ||
1582 | do_piping (pipe_in, pipe_out); | |
1583 | ||
3185942a JA |
1584 | #if defined (COPROCESS_SUPPORT) |
1585 | coproc_closeall (); | |
1586 | #endif | |
1587 | ||
8868edaf CR |
1588 | #if defined (PROCESS_SUBSTITUTION) |
1589 | clear_fifo_list (); /* XXX- we haven't created any FIFOs */ | |
1590 | #endif | |
1591 | ||
bb70624e JA |
1592 | /* If this is a user subshell, set a flag if stdin was redirected. |
1593 | This is used later to decide whether to redirect fd 0 to | |
1594 | /dev/null for async commands in the subshell. This adds more | |
a0c0a00f CR |
1595 | sh compatibility, but I'm not sure it's the right thing to do. |
1596 | Note that an input pipe to a compound command suffices to inhibit | |
1597 | the implicit /dev/null redirection for asynchronous commands | |
1598 | executed as part of that compound command. */ | |
bb70624e JA |
1599 | if (user_subshell) |
1600 | { | |
a0c0a00f CR |
1601 | stdin_redir = stdin_redirects (command->redirects) || pipe_in != NO_PIPE; |
1602 | #if 0 | |
1603 | restore_default_signal (EXIT_TRAP); /* XXX - reset_signal_handlers above */ | |
1604 | #endif | |
bb70624e | 1605 | } |
a0c0a00f CR |
1606 | else if (shell_control_structure (command->type) && pipe_in != NO_PIPE) |
1607 | stdin_redir = 1; | |
bb70624e JA |
1608 | |
1609 | /* If this is an asynchronous command (command &), we want to | |
1610 | redirect the standard input from /dev/null in the absence of | |
1611 | any specific redirection involving stdin. */ | |
1612 | if (should_redir_stdin && stdin_redir == 0) | |
1613 | async_redirect_stdin (); | |
1614 | ||
8868edaf CR |
1615 | #if defined (BUFFERED_INPUT) |
1616 | /* In any case, we are not reading our command input from stdin. */ | |
1617 | default_buffered_input = -1; | |
1618 | #endif | |
1619 | ||
1620 | #if 0 /* TAG: bash-5.2 */ | |
d233b485 CR |
1621 | if (user_subshell && command->type == cm_subshell) |
1622 | optimize_subshell_command (command->value.Subshell->command); | |
1623 | #endif | |
1624 | ||
bb70624e JA |
1625 | /* Do redirections, then dispose of them before recursive call. */ |
1626 | if (command->redirects) | |
1627 | { | |
b80f6443 | 1628 | if (do_redirections (command->redirects, RX_ACTIVE) != 0) |
28ef6c31 | 1629 | exit (invert ? EXECUTION_SUCCESS : EXECUTION_FAILURE); |
bb70624e JA |
1630 | |
1631 | dispose_redirects (command->redirects); | |
1632 | command->redirects = (REDIRECT *)NULL; | |
1633 | } | |
1634 | ||
3185942a JA |
1635 | if (command->type == cm_subshell) |
1636 | tcom = command->value.Subshell->command; | |
1637 | else if (user_coproc) | |
1638 | tcom = command->value.Coproc->command; | |
1639 | else | |
1640 | tcom = command; | |
bb70624e | 1641 | |
95732b49 JA |
1642 | if (command->flags & CMD_TIME_PIPELINE) |
1643 | tcom->flags |= CMD_TIME_PIPELINE; | |
1644 | if (command->flags & CMD_TIME_POSIX) | |
1645 | tcom->flags |= CMD_TIME_POSIX; | |
1646 | ||
f73dda09 JA |
1647 | /* Make sure the subshell inherits any CMD_IGNORE_RETURN flag. */ |
1648 | if ((command->flags & CMD_IGNORE_RETURN) && tcom != command) | |
1649 | tcom->flags |= CMD_IGNORE_RETURN; | |
1650 | ||
bb70624e JA |
1651 | /* If this is a simple command, tell execute_disk_command that it |
1652 | might be able to get away without forking and simply exec. | |
1653 | This means things like ( sleep 10 ) will only cause one fork. | |
28ef6c31 JA |
1654 | If we're timing the command or inverting its return value, however, |
1655 | we cannot do this optimization. */ | |
3185942a | 1656 | if ((user_subshell || user_coproc) && (tcom->type == cm_simple || tcom->type == cm_subshell) && |
28ef6c31 JA |
1657 | ((tcom->flags & CMD_TIME_PIPELINE) == 0) && |
1658 | ((tcom->flags & CMD_INVERT_RETURN) == 0)) | |
bb70624e JA |
1659 | { |
1660 | tcom->flags |= CMD_NO_FORK; | |
1661 | if (tcom->type == cm_simple) | |
1662 | tcom->value.Simple->flags |= CMD_NO_FORK; | |
1663 | } | |
1664 | ||
28ef6c31 JA |
1665 | invert = (tcom->flags & CMD_INVERT_RETURN) != 0; |
1666 | tcom->flags &= ~CMD_INVERT_RETURN; | |
1667 | ||
ac50fbac | 1668 | result = setjmp_nosigs (top_level); |
0001803f | 1669 | |
bb70624e JA |
1670 | /* If we're inside a function while executing this subshell, we |
1671 | need to handle a possible `return'. */ | |
1672 | function_value = 0; | |
1673 | if (return_catch_flag) | |
ac50fbac | 1674 | function_value = setjmp_nosigs (return_catch); |
bb70624e | 1675 | |
0001803f CR |
1676 | /* If we're going to exit the shell, we don't want to invert the return |
1677 | status. */ | |
1678 | if (result == EXITPROG) | |
1679 | invert = 0, return_code = last_command_exit_value; | |
1680 | else if (result) | |
a0c0a00f | 1681 | return_code = (last_command_exit_value == EXECUTION_SUCCESS) ? EXECUTION_FAILURE : last_command_exit_value; |
0001803f | 1682 | else if (function_value) |
bb70624e JA |
1683 | return_code = return_catch_value; |
1684 | else | |
ac50fbac | 1685 | return_code = execute_command_internal ((COMMAND *)tcom, asynchronous, NO_PIPE, NO_PIPE, fds_to_close); |
bb70624e | 1686 | |
28ef6c31 JA |
1687 | /* If we are asked to, invert the return value. */ |
1688 | if (invert) | |
1689 | return_code = (return_code == EXECUTION_SUCCESS) ? EXECUTION_FAILURE | |
1690 | : EXECUTION_SUCCESS; | |
1691 | ||
d233b485 | 1692 | |
bb70624e JA |
1693 | /* If we were explicitly placed in a subshell with (), we need |
1694 | to do the `shell cleanup' things, such as running traps[0]. */ | |
1695 | if (user_subshell && signal_is_trapped (0)) | |
1696 | { | |
1697 | last_command_exit_value = return_code; | |
1698 | return_code = run_exit_trap (); | |
1699 | } | |
1700 | ||
a0c0a00f CR |
1701 | #if 0 |
1702 | subshell_level--; /* don't bother, caller will just exit */ | |
1703 | #endif | |
bb70624e JA |
1704 | return (return_code); |
1705 | /* NOTREACHED */ | |
1706 | } | |
1707 | ||
3185942a JA |
1708 | #if defined (COPROCESS_SUPPORT) |
1709 | #define COPROC_MAX 16 | |
1710 | ||
1711 | typedef struct cpelement | |
1712 | { | |
1713 | struct cpelement *next; | |
1714 | struct coproc *coproc; | |
1715 | } | |
1716 | cpelement_t; | |
1717 | ||
1718 | typedef struct cplist | |
1719 | { | |
1720 | struct cpelement *head; | |
1721 | struct cpelement *tail; | |
1722 | int ncoproc; | |
ac50fbac | 1723 | int lock; |
3185942a JA |
1724 | } |
1725 | cplist_t; | |
1726 | ||
8868edaf CR |
1727 | static struct cpelement *cpe_alloc PARAMS((struct coproc *)); |
1728 | static void cpe_dispose PARAMS((struct cpelement *)); | |
1729 | static struct cpelement *cpl_add PARAMS((struct coproc *)); | |
1730 | static struct cpelement *cpl_delete PARAMS((pid_t)); | |
1731 | static void cpl_reap PARAMS((void)); | |
1732 | static void cpl_flush PARAMS((void)); | |
1733 | static void cpl_closeall PARAMS((void)); | |
1734 | static struct cpelement *cpl_search PARAMS((pid_t)); | |
1735 | static struct cpelement *cpl_searchbyname PARAMS((const char *)); | |
1736 | static void cpl_prune PARAMS((void)); | |
3185942a | 1737 | |
8868edaf | 1738 | static void coproc_free PARAMS((struct coproc *)); |
ac50fbac CR |
1739 | |
1740 | /* Will go away when there is fully-implemented support for multiple coprocs. */ | |
1741 | Coproc sh_coproc = { 0, NO_PID, -1, -1, 0, 0, 0, 0, 0 }; | |
3185942a JA |
1742 | |
1743 | cplist_t coproc_list = {0, 0, 0}; | |
1744 | ||
17345e5a | 1745 | /* Functions to manage the list of coprocs */ |
3185942a JA |
1746 | |
1747 | static struct cpelement * | |
1748 | cpe_alloc (cp) | |
1749 | Coproc *cp; | |
1750 | { | |
1751 | struct cpelement *cpe; | |
1752 | ||
1753 | cpe = (struct cpelement *)xmalloc (sizeof (struct cpelement)); | |
1754 | cpe->coproc = cp; | |
1755 | cpe->next = (struct cpelement *)0; | |
1756 | return cpe; | |
1757 | } | |
1758 | ||
1759 | static void | |
1760 | cpe_dispose (cpe) | |
1761 | struct cpelement *cpe; | |
1762 | { | |
1763 | free (cpe); | |
1764 | } | |
1765 | ||
1766 | static struct cpelement * | |
1767 | cpl_add (cp) | |
1768 | Coproc *cp; | |
1769 | { | |
1770 | struct cpelement *cpe; | |
1771 | ||
1772 | cpe = cpe_alloc (cp); | |
1773 | ||
1774 | if (coproc_list.head == 0) | |
1775 | { | |
1776 | coproc_list.head = coproc_list.tail = cpe; | |
1777 | coproc_list.ncoproc = 0; /* just to make sure */ | |
1778 | } | |
1779 | else | |
1780 | { | |
1781 | coproc_list.tail->next = cpe; | |
1782 | coproc_list.tail = cpe; | |
1783 | } | |
1784 | coproc_list.ncoproc++; | |
1785 | ||
1786 | return cpe; | |
1787 | } | |
1788 | ||
1789 | static struct cpelement * | |
1790 | cpl_delete (pid) | |
1791 | pid_t pid; | |
1792 | { | |
1793 | struct cpelement *prev, *p; | |
1794 | ||
1795 | for (prev = p = coproc_list.head; p; prev = p, p = p->next) | |
1796 | if (p->coproc->c_pid == pid) | |
1797 | { | |
1798 | prev->next = p->next; /* remove from list */ | |
1799 | break; | |
1800 | } | |
1801 | ||
1802 | if (p == 0) | |
1803 | return 0; /* not found */ | |
1804 | ||
1805 | #if defined (DEBUG) | |
1806 | itrace("cpl_delete: deleting %d", pid); | |
1807 | #endif | |
1808 | ||
1809 | /* Housekeeping in the border cases. */ | |
1810 | if (p == coproc_list.head) | |
1811 | coproc_list.head = coproc_list.head->next; | |
1812 | else if (p == coproc_list.tail) | |
1813 | coproc_list.tail = prev; | |
1814 | ||
1815 | coproc_list.ncoproc--; | |
1816 | if (coproc_list.ncoproc == 0) | |
1817 | coproc_list.head = coproc_list.tail = 0; | |
1818 | else if (coproc_list.ncoproc == 1) | |
1819 | coproc_list.tail = coproc_list.head; /* just to make sure */ | |
1820 | ||
1821 | return (p); | |
1822 | } | |
1823 | ||
17345e5a JA |
1824 | static void |
1825 | cpl_reap () | |
1826 | { | |
ac50fbac | 1827 | struct cpelement *p, *next, *nh, *nt; |
17345e5a | 1828 | |
ac50fbac CR |
1829 | /* Build a new list by removing dead coprocs and fix up the coproc_list |
1830 | pointers when done. */ | |
1831 | nh = nt = next = (struct cpelement *)0; | |
1832 | for (p = coproc_list.head; p; p = next) | |
1833 | { | |
1834 | next = p->next; | |
1835 | if (p->coproc->c_flags & COPROC_DEAD) | |
1836 | { | |
1837 | coproc_list.ncoproc--; /* keep running count, fix up pointers later */ | |
17345e5a JA |
1838 | |
1839 | #if defined (DEBUG) | |
ac50fbac | 1840 | itrace("cpl_reap: deleting %d", p->coproc->c_pid); |
17345e5a JA |
1841 | #endif |
1842 | ||
ac50fbac CR |
1843 | coproc_dispose (p->coproc); |
1844 | cpe_dispose (p); | |
1845 | } | |
1846 | else if (nh == 0) | |
1847 | nh = nt = p; | |
1848 | else | |
1849 | { | |
1850 | nt->next = p; | |
1851 | nt = nt->next; | |
1852 | } | |
1853 | } | |
1854 | ||
1855 | if (coproc_list.ncoproc == 0) | |
1856 | coproc_list.head = coproc_list.tail = 0; | |
1857 | else | |
1858 | { | |
1859 | if (nt) | |
1860 | nt->next = 0; | |
1861 | coproc_list.head = nh; | |
1862 | coproc_list.tail = nt; | |
1863 | if (coproc_list.ncoproc == 1) | |
1864 | coproc_list.tail = coproc_list.head; /* just to make sure */ | |
1865 | } | |
17345e5a JA |
1866 | } |
1867 | ||
3185942a JA |
1868 | /* Clear out the list of saved statuses */ |
1869 | static void | |
1870 | cpl_flush () | |
1871 | { | |
1872 | struct cpelement *cpe, *p; | |
1873 | ||
1874 | for (cpe = coproc_list.head; cpe; ) | |
1875 | { | |
1876 | p = cpe; | |
1877 | cpe = cpe->next; | |
1878 | ||
1879 | coproc_dispose (p->coproc); | |
1880 | cpe_dispose (p); | |
1881 | } | |
1882 | ||
1883 | coproc_list.head = coproc_list.tail = 0; | |
1884 | coproc_list.ncoproc = 0; | |
1885 | } | |
1886 | ||
ac50fbac CR |
1887 | static void |
1888 | cpl_closeall () | |
1889 | { | |
1890 | struct cpelement *cpe; | |
1891 | ||
1892 | for (cpe = coproc_list.head; cpe; cpe = cpe->next) | |
1893 | coproc_close (cpe->coproc); | |
1894 | } | |
1895 | ||
1896 | static void | |
1897 | cpl_fdchk (fd) | |
1898 | int fd; | |
1899 | { | |
1900 | struct cpelement *cpe; | |
1901 | ||
1902 | for (cpe = coproc_list.head; cpe; cpe = cpe->next) | |
1903 | coproc_checkfd (cpe->coproc, fd); | |
1904 | } | |
1905 | ||
3185942a JA |
1906 | /* Search for PID in the list of coprocs; return the cpelement struct if |
1907 | found. If not found, return NULL. */ | |
1908 | static struct cpelement * | |
1909 | cpl_search (pid) | |
1910 | pid_t pid; | |
1911 | { | |
ac50fbac | 1912 | struct cpelement *cpe; |
3185942a | 1913 | |
ac50fbac CR |
1914 | for (cpe = coproc_list.head ; cpe; cpe = cpe->next) |
1915 | if (cpe->coproc->c_pid == pid) | |
1916 | return cpe; | |
3185942a JA |
1917 | return (struct cpelement *)NULL; |
1918 | } | |
1919 | ||
1920 | /* Search for the coproc named NAME in the list of coprocs; return the | |
1921 | cpelement struct if found. If not found, return NULL. */ | |
1922 | static struct cpelement * | |
1923 | cpl_searchbyname (name) | |
ac50fbac | 1924 | const char *name; |
3185942a JA |
1925 | { |
1926 | struct cpelement *cp; | |
1927 | ||
1928 | for (cp = coproc_list.head ; cp; cp = cp->next) | |
1929 | if (STREQ (cp->coproc->c_name, name)) | |
1930 | return cp; | |
1931 | return (struct cpelement *)NULL; | |
1932 | } | |
1933 | ||
d233b485 CR |
1934 | static pid_t |
1935 | cpl_firstactive () | |
1936 | { | |
1937 | struct cpelement *cpe; | |
1938 | ||
1939 | for (cpe = coproc_list.head ; cpe; cpe = cpe->next) | |
1940 | if ((cpe->coproc->c_flags & COPROC_DEAD) == 0) | |
1941 | return cpe->coproc->c_pid; | |
1942 | return (pid_t)NO_PID; | |
1943 | } | |
1944 | ||
3185942a JA |
1945 | #if 0 |
1946 | static void | |
1947 | cpl_prune () | |
1948 | { | |
1949 | struct cpelement *cp; | |
1950 | ||
1951 | while (coproc_list.head && coproc_list.ncoproc > COPROC_MAX) | |
1952 | { | |
1953 | cp = coproc_list.head; | |
1954 | coproc_list.head = coproc_list.head->next; | |
1955 | coproc_dispose (cp->coproc); | |
1956 | cpe_dispose (cp); | |
1957 | coproc_list.ncoproc--; | |
1958 | } | |
1959 | } | |
1960 | #endif | |
1961 | ||
1962 | /* These currently use a single global "shell coproc" but are written in a | |
1963 | way to not preclude additional coprocs later (using the list management | |
1964 | package above). */ | |
1965 | ||
1966 | struct coproc * | |
1967 | getcoprocbypid (pid) | |
1968 | pid_t pid; | |
1969 | { | |
ac50fbac CR |
1970 | #if MULTIPLE_COPROCS |
1971 | struct cpelement *p; | |
1972 | ||
1973 | p = cpl_search (pid); | |
1974 | return (p ? p->coproc : 0); | |
1975 | #else | |
3185942a | 1976 | return (pid == sh_coproc.c_pid ? &sh_coproc : 0); |
ac50fbac | 1977 | #endif |
3185942a JA |
1978 | } |
1979 | ||
1980 | struct coproc * | |
1981 | getcoprocbyname (name) | |
1982 | const char *name; | |
1983 | { | |
ac50fbac CR |
1984 | #if MULTIPLE_COPROCS |
1985 | struct cpelement *p; | |
1986 | ||
1987 | p = cpl_searchbyname (name); | |
1988 | return (p ? p->coproc : 0); | |
1989 | #else | |
3185942a | 1990 | return ((sh_coproc.c_name && STREQ (sh_coproc.c_name, name)) ? &sh_coproc : 0); |
ac50fbac | 1991 | #endif |
3185942a JA |
1992 | } |
1993 | ||
1994 | void | |
1995 | coproc_init (cp) | |
1996 | struct coproc *cp; | |
1997 | { | |
1998 | cp->c_name = 0; | |
1999 | cp->c_pid = NO_PID; | |
2000 | cp->c_rfd = cp->c_wfd = -1; | |
2001 | cp->c_rsave = cp->c_wsave = -1; | |
ac50fbac | 2002 | cp->c_flags = cp->c_status = cp->c_lock = 0; |
3185942a JA |
2003 | } |
2004 | ||
2005 | struct coproc * | |
2006 | coproc_alloc (name, pid) | |
2007 | char *name; | |
2008 | pid_t pid; | |
2009 | { | |
2010 | struct coproc *cp; | |
2011 | ||
ac50fbac CR |
2012 | #if MULTIPLE_COPROCS |
2013 | cp = (struct coproc *)xmalloc (sizeof (struct coproc)); | |
2014 | #else | |
2015 | cp = &sh_coproc; | |
2016 | #endif | |
3185942a | 2017 | coproc_init (cp); |
ac50fbac | 2018 | cp->c_lock = 2; |
3185942a | 2019 | |
3185942a | 2020 | cp->c_pid = pid; |
ac50fbac CR |
2021 | cp->c_name = savestring (name); |
2022 | #if MULTIPLE_COPROCS | |
2023 | cpl_add (cp); | |
2024 | #endif | |
2025 | cp->c_lock = 0; | |
3185942a JA |
2026 | return (cp); |
2027 | } | |
2028 | ||
ac50fbac CR |
2029 | static void |
2030 | coproc_free (cp) | |
2031 | struct coproc *cp; | |
2032 | { | |
2033 | free (cp); | |
2034 | } | |
2035 | ||
3185942a JA |
2036 | void |
2037 | coproc_dispose (cp) | |
2038 | struct coproc *cp; | |
2039 | { | |
ac50fbac CR |
2040 | sigset_t set, oset; |
2041 | ||
3185942a JA |
2042 | if (cp == 0) |
2043 | return; | |
2044 | ||
ac50fbac CR |
2045 | BLOCK_SIGNAL (SIGCHLD, set, oset); |
2046 | cp->c_lock = 3; | |
3185942a JA |
2047 | coproc_unsetvars (cp); |
2048 | FREE (cp->c_name); | |
2049 | coproc_close (cp); | |
ac50fbac CR |
2050 | #if MULTIPLE_COPROCS |
2051 | coproc_free (cp); | |
2052 | #else | |
3185942a | 2053 | coproc_init (cp); |
ac50fbac CR |
2054 | cp->c_lock = 0; |
2055 | #endif | |
2056 | UNBLOCK_SIGNAL (oset); | |
3185942a JA |
2057 | } |
2058 | ||
ac50fbac | 2059 | /* Placeholder for now. Will require changes for multiple coprocs */ |
3185942a JA |
2060 | void |
2061 | coproc_flush () | |
2062 | { | |
ac50fbac CR |
2063 | #if MULTIPLE_COPROCS |
2064 | cpl_flush (); | |
2065 | #else | |
3185942a | 2066 | coproc_dispose (&sh_coproc); |
ac50fbac | 2067 | #endif |
3185942a JA |
2068 | } |
2069 | ||
2070 | void | |
2071 | coproc_close (cp) | |
2072 | struct coproc *cp; | |
2073 | { | |
2074 | if (cp->c_rfd >= 0) | |
2075 | { | |
2076 | close (cp->c_rfd); | |
2077 | cp->c_rfd = -1; | |
2078 | } | |
2079 | if (cp->c_wfd >= 0) | |
2080 | { | |
2081 | close (cp->c_wfd); | |
2082 | cp->c_wfd = -1; | |
2083 | } | |
2084 | cp->c_rsave = cp->c_wsave = -1; | |
2085 | } | |
2086 | ||
2087 | void | |
2088 | coproc_closeall () | |
2089 | { | |
ac50fbac CR |
2090 | #if MULTIPLE_COPROCS |
2091 | cpl_closeall (); | |
2092 | #else | |
2093 | coproc_close (&sh_coproc); /* XXX - will require changes for multiple coprocs */ | |
2094 | #endif | |
3185942a JA |
2095 | } |
2096 | ||
17345e5a JA |
2097 | void |
2098 | coproc_reap () | |
2099 | { | |
ac50fbac CR |
2100 | #if MULTIPLE_COPROCS |
2101 | cpl_reap (); | |
2102 | #else | |
17345e5a JA |
2103 | struct coproc *cp; |
2104 | ||
ac50fbac | 2105 | cp = &sh_coproc; /* XXX - will require changes for multiple coprocs */ |
17345e5a JA |
2106 | if (cp && (cp->c_flags & COPROC_DEAD)) |
2107 | coproc_dispose (cp); | |
ac50fbac | 2108 | #endif |
17345e5a JA |
2109 | } |
2110 | ||
3185942a JA |
2111 | void |
2112 | coproc_rclose (cp, fd) | |
2113 | struct coproc *cp; | |
2114 | int fd; | |
2115 | { | |
2116 | if (cp->c_rfd >= 0 && cp->c_rfd == fd) | |
2117 | { | |
2118 | close (cp->c_rfd); | |
2119 | cp->c_rfd = -1; | |
2120 | } | |
2121 | } | |
2122 | ||
2123 | void | |
2124 | coproc_wclose (cp, fd) | |
2125 | struct coproc *cp; | |
2126 | int fd; | |
2127 | { | |
2128 | if (cp->c_wfd >= 0 && cp->c_wfd == fd) | |
2129 | { | |
2130 | close (cp->c_wfd); | |
2131 | cp->c_wfd = -1; | |
2132 | } | |
2133 | } | |
2134 | ||
2135 | void | |
2136 | coproc_checkfd (cp, fd) | |
2137 | struct coproc *cp; | |
2138 | int fd; | |
2139 | { | |
2140 | int update; | |
2141 | ||
2142 | update = 0; | |
2143 | if (cp->c_rfd >= 0 && cp->c_rfd == fd) | |
2144 | update = cp->c_rfd = -1; | |
2145 | if (cp->c_wfd >= 0 && cp->c_wfd == fd) | |
2146 | update = cp->c_wfd = -1; | |
2147 | if (update) | |
2148 | coproc_setvars (cp); | |
2149 | } | |
2150 | ||
2151 | void | |
2152 | coproc_fdchk (fd) | |
2153 | int fd; | |
2154 | { | |
ac50fbac CR |
2155 | #if MULTIPLE_COPROCS |
2156 | cpl_fdchk (fd); | |
2157 | #else | |
3185942a | 2158 | coproc_checkfd (&sh_coproc, fd); |
ac50fbac | 2159 | #endif |
3185942a JA |
2160 | } |
2161 | ||
2162 | void | |
2163 | coproc_fdclose (cp, fd) | |
2164 | struct coproc *cp; | |
2165 | int fd; | |
2166 | { | |
2167 | coproc_rclose (cp, fd); | |
2168 | coproc_wclose (cp, fd); | |
2169 | coproc_setvars (cp); | |
2170 | } | |
2171 | ||
2172 | void | |
2173 | coproc_fdsave (cp) | |
2174 | struct coproc *cp; | |
2175 | { | |
2176 | cp->c_rsave = cp->c_rfd; | |
2177 | cp->c_wsave = cp->c_wfd; | |
2178 | } | |
2179 | ||
2180 | void | |
2181 | coproc_fdrestore (cp) | |
2182 | struct coproc *cp; | |
2183 | { | |
2184 | cp->c_rfd = cp->c_rsave; | |
2185 | cp->c_wfd = cp->c_wsave; | |
2186 | } | |
17345e5a | 2187 | |
d233b485 CR |
2188 | static void |
2189 | coproc_setstatus (cp, status) | |
2190 | struct coproc *cp; | |
2191 | int status; | |
2192 | { | |
2193 | cp->c_lock = 4; | |
2194 | cp->c_status = status; | |
2195 | cp->c_flags |= COPROC_DEAD; | |
2196 | cp->c_flags &= ~COPROC_RUNNING; | |
2197 | /* Don't dispose the coproc or unset the COPROC_XXX variables because | |
2198 | this is executed in a signal handler context. Wait until coproc_reap | |
2199 | takes care of it. */ | |
2200 | cp->c_lock = 0; | |
2201 | } | |
2202 | ||
3185942a | 2203 | void |
17345e5a | 2204 | coproc_pidchk (pid, status) |
3185942a | 2205 | pid_t pid; |
a0c0a00f | 2206 | int status; |
3185942a JA |
2207 | { |
2208 | struct coproc *cp; | |
2209 | ||
ac50fbac CR |
2210 | #if MULTIPLE_COPROCS |
2211 | struct cpelement *cpe; | |
2212 | ||
d233b485 CR |
2213 | /* We're not disposing the coproc because this is executed in a signal |
2214 | handler context */ | |
2215 | cpe = cpl_search (pid); | |
ac50fbac CR |
2216 | cp = cpe ? cpe->coproc : 0; |
2217 | #else | |
3185942a | 2218 | cp = getcoprocbypid (pid); |
3185942a JA |
2219 | #endif |
2220 | if (cp) | |
d233b485 | 2221 | coproc_setstatus (cp, status); |
3185942a JA |
2222 | } |
2223 | ||
d233b485 CR |
2224 | pid_t |
2225 | coproc_active () | |
2226 | { | |
2227 | #if MULTIPLE_COPROCS | |
2228 | return (cpl_firstactive ()); | |
2229 | #else | |
2230 | return ((sh_coproc.c_flags & COPROC_DEAD) ? NO_PID : sh_coproc.c_pid); | |
2231 | #endif | |
2232 | } | |
3185942a JA |
2233 | void |
2234 | coproc_setvars (cp) | |
2235 | struct coproc *cp; | |
2236 | { | |
2237 | SHELL_VAR *v; | |
2238 | char *namevar, *t; | |
2239 | int l; | |
a0c0a00f | 2240 | WORD_DESC w; |
3185942a JA |
2241 | #if defined (ARRAY_VARS) |
2242 | arrayind_t ind; | |
2243 | #endif | |
2244 | ||
2245 | if (cp->c_name == 0) | |
2246 | return; | |
2247 | ||
a0c0a00f CR |
2248 | /* We could do more here but right now we only check the name, warn if it's |
2249 | not a valid identifier, and refuse to create variables with invalid names | |
2250 | if a coproc with such a name is supplied. */ | |
2251 | w.word = cp->c_name; | |
2252 | w.flags = 0; | |
2253 | if (check_identifier (&w, 1) == 0) | |
2254 | return; | |
2255 | ||
3185942a JA |
2256 | l = strlen (cp->c_name); |
2257 | namevar = xmalloc (l + 16); | |
2258 | ||
2259 | #if defined (ARRAY_VARS) | |
2260 | v = find_variable (cp->c_name); | |
a0c0a00f CR |
2261 | |
2262 | /* This is the same code as in find_or_make_array_variable */ | |
2263 | if (v == 0) | |
2264 | { | |
2265 | v = find_variable_nameref_for_create (cp->c_name, 1); | |
2266 | if (v == INVALID_NAMEREF_VALUE) | |
d233b485 CR |
2267 | { |
2268 | free (namevar); | |
2269 | return; | |
2270 | } | |
a0c0a00f CR |
2271 | if (v && nameref_p (v)) |
2272 | { | |
2273 | free (cp->c_name); | |
2274 | cp->c_name = savestring (nameref_cell (v)); | |
2275 | v = make_new_array_variable (cp->c_name); | |
2276 | } | |
2277 | } | |
2278 | ||
2279 | if (v && (readonly_p (v) || noassign_p (v))) | |
2280 | { | |
2281 | if (readonly_p (v)) | |
2282 | err_readonly (cp->c_name); | |
d233b485 | 2283 | free (namevar); |
a0c0a00f CR |
2284 | return; |
2285 | } | |
3185942a JA |
2286 | if (v == 0) |
2287 | v = make_new_array_variable (cp->c_name); | |
2288 | if (array_p (v) == 0) | |
2289 | v = convert_var_to_array (v); | |
2290 | ||
2291 | t = itos (cp->c_rfd); | |
2292 | ind = 0; | |
2293 | v = bind_array_variable (cp->c_name, ind, t, 0); | |
2294 | free (t); | |
2295 | ||
2296 | t = itos (cp->c_wfd); | |
2297 | ind = 1; | |
d233b485 | 2298 | v = bind_array_variable (cp->c_name, ind, t, 0); |
3185942a JA |
2299 | free (t); |
2300 | #else | |
2301 | sprintf (namevar, "%s_READ", cp->c_name); | |
2302 | t = itos (cp->c_rfd); | |
2303 | bind_variable (namevar, t, 0); | |
2304 | free (t); | |
2305 | sprintf (namevar, "%s_WRITE", cp->c_name); | |
2306 | t = itos (cp->c_wfd); | |
2307 | bind_variable (namevar, t, 0); | |
2308 | free (t); | |
2309 | #endif | |
2310 | ||
2311 | sprintf (namevar, "%s_PID", cp->c_name); | |
2312 | t = itos (cp->c_pid); | |
d233b485 | 2313 | v = bind_variable (namevar, t, 0); |
3185942a JA |
2314 | free (t); |
2315 | ||
2316 | free (namevar); | |
2317 | } | |
2318 | ||
2319 | void | |
2320 | coproc_unsetvars (cp) | |
2321 | struct coproc *cp; | |
2322 | { | |
2323 | int l; | |
2324 | char *namevar; | |
2325 | ||
2326 | if (cp->c_name == 0) | |
2327 | return; | |
2328 | ||
2329 | l = strlen (cp->c_name); | |
2330 | namevar = xmalloc (l + 16); | |
2331 | ||
2332 | sprintf (namevar, "%s_PID", cp->c_name); | |
a0c0a00f | 2333 | unbind_variable_noref (namevar); |
3185942a JA |
2334 | |
2335 | #if defined (ARRAY_VARS) | |
a0c0a00f | 2336 | check_unbind_variable (cp->c_name); |
3185942a JA |
2337 | #else |
2338 | sprintf (namevar, "%s_READ", cp->c_name); | |
2339 | unbind_variable (namevar); | |
2340 | sprintf (namevar, "%s_WRITE", cp->c_name); | |
2341 | unbind_variable (namevar); | |
2342 | #endif | |
2343 | ||
2344 | free (namevar); | |
2345 | } | |
2346 | ||
2347 | static int | |
2348 | execute_coproc (command, pipe_in, pipe_out, fds_to_close) | |
2349 | COMMAND *command; | |
2350 | int pipe_in, pipe_out; | |
2351 | struct fd_bitmap *fds_to_close; | |
2352 | { | |
ac50fbac | 2353 | int rpipe[2], wpipe[2], estat, invert; |
3185942a JA |
2354 | pid_t coproc_pid; |
2355 | Coproc *cp; | |
d233b485 | 2356 | char *tcmd, *p, *name; |
ac50fbac | 2357 | sigset_t set, oset; |
3185942a | 2358 | |
ac50fbac CR |
2359 | /* XXX -- can be removed after changes to handle multiple coprocs */ |
2360 | #if !MULTIPLE_COPROCS | |
d233b485 | 2361 | if (sh_coproc.c_pid != NO_PID && (sh_coproc.c_rfd >= 0 || sh_coproc.c_wfd >= 0)) |
a0c0a00f | 2362 | internal_warning (_("execute_coproc: coproc [%d:%s] still exists"), sh_coproc.c_pid, sh_coproc.c_name); |
3185942a | 2363 | coproc_init (&sh_coproc); |
ac50fbac | 2364 | #endif |
3185942a | 2365 | |
ac50fbac | 2366 | invert = (command->flags & CMD_INVERT_RETURN) != 0; |
d233b485 CR |
2367 | |
2368 | /* expand name without splitting - could make this dependent on a shopt option */ | |
2369 | name = expand_string_unsplit_to_string (command->value.Coproc->name, 0); | |
2370 | /* Optional check -- could be relaxed */ | |
2371 | if (legal_identifier (name) == 0) | |
2372 | { | |
2373 | internal_error (_("`%s': not a valid identifier"), name); | |
2374 | return (invert ? EXECUTION_SUCCESS : EXECUTION_FAILURE); | |
2375 | } | |
2376 | else | |
2377 | { | |
2378 | free (command->value.Coproc->name); | |
2379 | command->value.Coproc->name = name; | |
2380 | } | |
2381 | ||
3185942a JA |
2382 | command_string_index = 0; |
2383 | tcmd = make_command_string (command); | |
2384 | ||
2385 | sh_openpipe ((int *)&rpipe); /* 0 = parent read, 1 = child write */ | |
2386 | sh_openpipe ((int *)&wpipe); /* 0 = child read, 1 = parent write */ | |
2387 | ||
ac50fbac CR |
2388 | BLOCK_SIGNAL (SIGCHLD, set, oset); |
2389 | ||
8868edaf | 2390 | coproc_pid = make_child (p = savestring (tcmd), FORK_ASYNC); |
ac50fbac | 2391 | |
3185942a JA |
2392 | if (coproc_pid == 0) |
2393 | { | |
2394 | close (rpipe[0]); | |
2395 | close (wpipe[1]); | |
2396 | ||
d233b485 CR |
2397 | #if defined (JOB_CONTROL) |
2398 | FREE (p); | |
2399 | #endif | |
2400 | ||
ac50fbac | 2401 | UNBLOCK_SIGNAL (oset); |
0001803f CR |
2402 | estat = execute_in_subshell (command, 1, wpipe[0], rpipe[1], fds_to_close); |
2403 | ||
2404 | fflush (stdout); | |
2405 | fflush (stderr); | |
2406 | ||
2407 | exit (estat); | |
3185942a JA |
2408 | } |
2409 | ||
2410 | close (rpipe[1]); | |
2411 | close (wpipe[0]); | |
2412 | ||
2413 | cp = coproc_alloc (command->value.Coproc->name, coproc_pid); | |
2414 | cp->c_rfd = rpipe[0]; | |
2415 | cp->c_wfd = wpipe[1]; | |
2416 | ||
d233b485 CR |
2417 | cp->c_flags |= COPROC_RUNNING; |
2418 | ||
3185942a JA |
2419 | SET_CLOSE_ON_EXEC (cp->c_rfd); |
2420 | SET_CLOSE_ON_EXEC (cp->c_wfd); | |
2421 | ||
2422 | coproc_setvars (cp); | |
2423 | ||
ac50fbac CR |
2424 | UNBLOCK_SIGNAL (oset); |
2425 | ||
3185942a | 2426 | #if 0 |
d233b485 | 2427 | itrace ("execute_coproc (%s): [%d] %s", command->value.Coproc->name, coproc_pid, the_printed_command); |
3185942a JA |
2428 | #endif |
2429 | ||
2430 | close_pipes (pipe_in, pipe_out); | |
2431 | #if defined (PROCESS_SUBSTITUTION) && defined (HAVE_DEV_FD) | |
2432 | unlink_fifo_list (); | |
2433 | #endif | |
2434 | stop_pipeline (1, (COMMAND *)NULL); | |
2435 | DESCRIBE_PID (coproc_pid); | |
2436 | run_pending_traps (); | |
2437 | ||
ac50fbac | 2438 | return (invert ? EXECUTION_FAILURE : EXECUTION_SUCCESS); |
3185942a JA |
2439 | } |
2440 | #endif | |
2441 | ||
495aee44 CR |
2442 | static void |
2443 | restore_stdin (s) | |
2444 | int s; | |
2445 | { | |
2446 | dup2 (s, 0); | |
2447 | close (s); | |
2448 | } | |
2449 | ||
2450 | /* Catch-all cleanup function for lastpipe code for unwind-protects */ | |
2451 | static void | |
2452 | lastpipe_cleanup (s) | |
2453 | int s; | |
2454 | { | |
d233b485 | 2455 | set_jobs_list_frozen (s); |
495aee44 CR |
2456 | } |
2457 | ||
ccc6cda3 JA |
2458 | static int |
2459 | execute_pipeline (command, asynchronous, pipe_in, pipe_out, fds_to_close) | |
2460 | COMMAND *command; | |
2461 | int asynchronous, pipe_in, pipe_out; | |
2462 | struct fd_bitmap *fds_to_close; | |
2463 | { | |
2464 | int prev, fildes[2], new_bitmap_size, dummyfd, ignore_return, exec_result; | |
d233b485 | 2465 | int lstdin, lastpipe_flag, lastpipe_jid, old_frozen; |
ccc6cda3 JA |
2466 | COMMAND *cmd; |
2467 | struct fd_bitmap *fd_bitmap; | |
495aee44 | 2468 | pid_t lastpid; |
726f6388 JA |
2469 | |
2470 | #if defined (JOB_CONTROL) | |
ccc6cda3 JA |
2471 | sigset_t set, oset; |
2472 | BLOCK_CHILD (set, oset); | |
726f6388 JA |
2473 | #endif /* JOB_CONTROL */ |
2474 | ||
ccc6cda3 | 2475 | ignore_return = (command->flags & CMD_IGNORE_RETURN) != 0; |
726f6388 | 2476 | |
ccc6cda3 JA |
2477 | prev = pipe_in; |
2478 | cmd = command; | |
2479 | ||
2480 | while (cmd && cmd->type == cm_connection && | |
2481 | cmd->value.Connection && cmd->value.Connection->connector == '|') | |
2482 | { | |
2483 | /* Make a pipeline between the two commands. */ | |
2484 | if (pipe (fildes) < 0) | |
2485 | { | |
3185942a | 2486 | sys_error (_("pipe error")); |
726f6388 | 2487 | #if defined (JOB_CONTROL) |
ccc6cda3 JA |
2488 | terminate_current_pipeline (); |
2489 | kill_current_pipeline (); | |
95732b49 | 2490 | UNBLOCK_CHILD (oset); |
726f6388 | 2491 | #endif /* JOB_CONTROL */ |
ccc6cda3 JA |
2492 | last_command_exit_value = EXECUTION_FAILURE; |
2493 | /* The unwind-protects installed below will take care | |
2494 | of closing all of the open file descriptors. */ | |
2495 | throw_to_top_level (); | |
2496 | return (EXECUTION_FAILURE); /* XXX */ | |
2497 | } | |
2498 | ||
2499 | /* Here is a problem: with the new file close-on-exec | |
2500 | code, the read end of the pipe (fildes[0]) stays open | |
2501 | in the first process, so that process will never get a | |
2502 | SIGPIPE. There is no way to signal the first process | |
2503 | that it should close fildes[0] after forking, so it | |
2504 | remains open. No SIGPIPE is ever sent because there | |
2505 | is still a file descriptor open for reading connected | |
2506 | to the pipe. We take care of that here. This passes | |
2507 | around a bitmap of file descriptors that must be | |
2508 | closed after making a child process in execute_simple_command. */ | |
2509 | ||
2510 | /* We need fd_bitmap to be at least as big as fildes[0]. | |
2511 | If fildes[0] is less than fds_to_close->size, then | |
2512 | use fds_to_close->size. */ | |
2513 | new_bitmap_size = (fildes[0] < fds_to_close->size) | |
2514 | ? fds_to_close->size | |
2515 | : fildes[0] + 8; | |
2516 | ||
2517 | fd_bitmap = new_fd_bitmap (new_bitmap_size); | |
2518 | ||
2519 | /* Now copy the old information into the new bitmap. */ | |
2520 | xbcopy ((char *)fds_to_close->bitmap, (char *)fd_bitmap->bitmap, fds_to_close->size); | |
2521 | ||
2522 | /* And mark the pipe file descriptors to be closed. */ | |
2523 | fd_bitmap->bitmap[fildes[0]] = 1; | |
2524 | ||
2525 | /* In case there are pipe or out-of-processes errors, we | |
cce855bc | 2526 | want all these file descriptors to be closed when |
ccc6cda3 JA |
2527 | unwind-protects are run, and the storage used for the |
2528 | bitmaps freed up. */ | |
2529 | begin_unwind_frame ("pipe-file-descriptors"); | |
2530 | add_unwind_protect (dispose_fd_bitmap, fd_bitmap); | |
2531 | add_unwind_protect (close_fd_bitmap, fd_bitmap); | |
2532 | if (prev >= 0) | |
2533 | add_unwind_protect (close, prev); | |
2534 | dummyfd = fildes[1]; | |
2535 | add_unwind_protect (close, dummyfd); | |
726f6388 JA |
2536 | |
2537 | #if defined (JOB_CONTROL) | |
f73dda09 | 2538 | add_unwind_protect (restore_signal_mask, &oset); |
726f6388 JA |
2539 | #endif /* JOB_CONTROL */ |
2540 | ||
ccc6cda3 JA |
2541 | if (ignore_return && cmd->value.Connection->first) |
2542 | cmd->value.Connection->first->flags |= CMD_IGNORE_RETURN; | |
2543 | execute_command_internal (cmd->value.Connection->first, asynchronous, | |
2544 | prev, fildes[1], fd_bitmap); | |
2545 | ||
2546 | if (prev >= 0) | |
2547 | close (prev); | |
2548 | ||
2549 | prev = fildes[0]; | |
2550 | close (fildes[1]); | |
2551 | ||
2552 | dispose_fd_bitmap (fd_bitmap); | |
2553 | discard_unwind_frame ("pipe-file-descriptors"); | |
726f6388 | 2554 | |
ccc6cda3 JA |
2555 | cmd = cmd->value.Connection->second; |
2556 | } | |
2557 | ||
495aee44 CR |
2558 | lastpid = last_made_pid; |
2559 | ||
ccc6cda3 JA |
2560 | /* Now execute the rightmost command in the pipeline. */ |
2561 | if (ignore_return && cmd) | |
2562 | cmd->flags |= CMD_IGNORE_RETURN; | |
495aee44 CR |
2563 | |
2564 | lastpipe_flag = 0; | |
ac50fbac | 2565 | |
495aee44 CR |
2566 | begin_unwind_frame ("lastpipe-exec"); |
2567 | lstdin = -1; | |
2568 | /* If the `lastpipe' option is set with shopt, and job control is not | |
2569 | enabled, execute the last element of non-async pipelines in the | |
2570 | current shell environment. */ | |
2571 | if (lastpipe_opt && job_control == 0 && asynchronous == 0 && pipe_out == NO_PIPE && prev > 0) | |
2572 | { | |
72347977 | 2573 | lstdin = move_to_high_fd (0, 1, -1); |
495aee44 CR |
2574 | if (lstdin > 0) |
2575 | { | |
2576 | do_piping (prev, pipe_out); | |
2577 | prev = NO_PIPE; | |
2578 | add_unwind_protect (restore_stdin, lstdin); | |
2579 | lastpipe_flag = 1; | |
d233b485 | 2580 | old_frozen = freeze_jobs_list (); |
495aee44 | 2581 | lastpipe_jid = stop_pipeline (0, (COMMAND *)NULL); /* XXX */ |
d233b485 | 2582 | add_unwind_protect (lastpipe_cleanup, old_frozen); |
8868edaf CR |
2583 | #if defined (JOB_CONTROL) |
2584 | UNBLOCK_CHILD (oset); /* XXX */ | |
2585 | #endif | |
495aee44 | 2586 | } |
335de49a CR |
2587 | if (cmd) |
2588 | cmd->flags |= CMD_LASTPIPE; | |
495aee44 CR |
2589 | } |
2590 | if (prev >= 0) | |
2591 | add_unwind_protect (close, prev); | |
2592 | ||
ccc6cda3 | 2593 | exec_result = execute_command_internal (cmd, asynchronous, prev, pipe_out, fds_to_close); |
726f6388 | 2594 | |
495aee44 CR |
2595 | if (lstdin > 0) |
2596 | restore_stdin (lstdin); | |
2597 | ||
ccc6cda3 JA |
2598 | if (prev >= 0) |
2599 | close (prev); | |
726f6388 JA |
2600 | |
2601 | #if defined (JOB_CONTROL) | |
ccc6cda3 | 2602 | UNBLOCK_CHILD (oset); |
726f6388 | 2603 | #endif |
726f6388 | 2604 | |
3185942a | 2605 | QUIT; |
495aee44 CR |
2606 | |
2607 | if (lastpipe_flag) | |
2608 | { | |
2609 | #if defined (JOB_CONTROL) | |
8061f8f1 CR |
2610 | if (INVALID_JOB (lastpipe_jid) == 0) |
2611 | { | |
2612 | append_process (savestring (the_printed_command_except_trap), dollar_dollar_pid, exec_result, lastpipe_jid); | |
8868edaf | 2613 | lstdin = wait_for (lastpid, 0); |
8061f8f1 CR |
2614 | } |
2615 | else | |
a0c0a00f | 2616 | lstdin = wait_for_single_pid (lastpid, 0); /* checks bgpids list */ |
8061f8f1 | 2617 | #else |
8868edaf | 2618 | lstdin = wait_for (lastpid, 0); |
8061f8f1 CR |
2619 | #endif |
2620 | ||
495aee44 | 2621 | #if defined (JOB_CONTROL) |
df2c55de CR |
2622 | /* If wait_for removes the job from the jobs table, use result of last |
2623 | command as pipeline's exit status as usual. The jobs list can get | |
2624 | frozen and unfrozen at inconvenient times if there are multiple pipelines | |
2625 | running simultaneously. */ | |
2626 | if (INVALID_JOB (lastpipe_jid) == 0) | |
2627 | exec_result = job_exit_status (lastpipe_jid); | |
2628 | else if (pipefail_opt) | |
2629 | exec_result = exec_result | lstdin; /* XXX */ | |
2630 | /* otherwise we use exec_result */ | |
495aee44 | 2631 | #endif |
d233b485 CR |
2632 | |
2633 | set_jobs_list_frozen (old_frozen); | |
495aee44 CR |
2634 | } |
2635 | ||
2636 | discard_unwind_frame ("lastpipe-exec"); | |
2637 | ||
ccc6cda3 JA |
2638 | return (exec_result); |
2639 | } | |
2640 | ||
2641 | static int | |
2642 | execute_connection (command, asynchronous, pipe_in, pipe_out, fds_to_close) | |
2643 | COMMAND *command; | |
2644 | int asynchronous, pipe_in, pipe_out; | |
2645 | struct fd_bitmap *fds_to_close; | |
2646 | { | |
ccc6cda3 | 2647 | COMMAND *tc, *second; |
17345e5a | 2648 | int ignore_return, exec_result, was_error_trap, invert; |
89a92869 | 2649 | volatile int save_line_number; |
ccc6cda3 JA |
2650 | |
2651 | ignore_return = (command->flags & CMD_IGNORE_RETURN) != 0; | |
2652 | ||
2653 | switch (command->value.Connection->connector) | |
2654 | { | |
2655 | /* Do the first command asynchronously. */ | |
2656 | case '&': | |
2657 | tc = command->value.Connection->first; | |
2658 | if (tc == 0) | |
2659 | return (EXECUTION_SUCCESS); | |
2660 | ||
d166f048 | 2661 | if (ignore_return) |
ccc6cda3 | 2662 | tc->flags |= CMD_IGNORE_RETURN; |
d166f048 | 2663 | tc->flags |= CMD_AMPERSAND; |
ccc6cda3 | 2664 | |
f73dda09 JA |
2665 | /* If this shell was compiled without job control support, |
2666 | if we are currently in a subshell via `( xxx )', or if job | |
2667 | control is not active then the standard input for an | |
2668 | asynchronous command is forced to /dev/null. */ | |
ccc6cda3 | 2669 | #if defined (JOB_CONTROL) |
f73dda09 | 2670 | if ((subshell_environment || !job_control) && !stdin_redir) |
ccc6cda3 JA |
2671 | #else |
2672 | if (!stdin_redir) | |
2673 | #endif /* JOB_CONTROL */ | |
7117c2d2 | 2674 | tc->flags |= CMD_STDIN_REDIR; |
ccc6cda3 JA |
2675 | |
2676 | exec_result = execute_command_internal (tc, 1, pipe_in, pipe_out, fds_to_close); | |
3185942a | 2677 | QUIT; |
ccc6cda3 | 2678 | |
d166f048 | 2679 | if (tc->flags & CMD_STDIN_REDIR) |
7117c2d2 | 2680 | tc->flags &= ~CMD_STDIN_REDIR; |
726f6388 | 2681 | |
ccc6cda3 JA |
2682 | second = command->value.Connection->second; |
2683 | if (second) | |
2684 | { | |
2685 | if (ignore_return) | |
2686 | second->flags |= CMD_IGNORE_RETURN; | |
726f6388 | 2687 | |
ccc6cda3 JA |
2688 | exec_result = execute_command_internal (second, asynchronous, pipe_in, pipe_out, fds_to_close); |
2689 | } | |
726f6388 | 2690 | |
ccc6cda3 | 2691 | break; |
726f6388 | 2692 | |
ccc6cda3 JA |
2693 | /* Just call execute command on both sides. */ |
2694 | case ';': | |
2695 | if (ignore_return) | |
2696 | { | |
2697 | if (command->value.Connection->first) | |
2698 | command->value.Connection->first->flags |= CMD_IGNORE_RETURN; | |
2699 | if (command->value.Connection->second) | |
2700 | command->value.Connection->second->flags |= CMD_IGNORE_RETURN; | |
726f6388 | 2701 | } |
3185942a | 2702 | executing_list++; |
ccc6cda3 | 2703 | QUIT; |
8868edaf CR |
2704 | |
2705 | #if 1 | |
ccc6cda3 | 2706 | execute_command (command->value.Connection->first); |
8868edaf CR |
2707 | #else |
2708 | execute_command_internal (command->value.Connection->first, | |
2709 | asynchronous, pipe_in, pipe_out, | |
2710 | fds_to_close); | |
2711 | #endif | |
2712 | ||
ccc6cda3 | 2713 | QUIT; |
8868edaf | 2714 | optimize_fork (command); /* XXX */ |
ccc6cda3 JA |
2715 | exec_result = execute_command_internal (command->value.Connection->second, |
2716 | asynchronous, pipe_in, pipe_out, | |
2717 | fds_to_close); | |
3185942a | 2718 | executing_list--; |
726f6388 JA |
2719 | break; |
2720 | ||
ccc6cda3 | 2721 | case '|': |
17345e5a JA |
2722 | was_error_trap = signal_is_trapped (ERROR_TRAP) && signal_is_ignored (ERROR_TRAP) == 0; |
2723 | invert = (command->flags & CMD_INVERT_RETURN) != 0; | |
2724 | ignore_return = (command->flags & CMD_IGNORE_RETURN) != 0; | |
2725 | ||
a0c0a00f | 2726 | line_number_for_err_trap = line_number; /* XXX - save value? */ |
ccc6cda3 | 2727 | exec_result = execute_pipeline (command, asynchronous, pipe_in, pipe_out, fds_to_close); |
17345e5a | 2728 | |
a0c0a00f CR |
2729 | if (asynchronous) |
2730 | { | |
2731 | exec_result = EXECUTION_SUCCESS; | |
2732 | invert = 0; | |
2733 | } | |
2734 | ||
17345e5a JA |
2735 | if (was_error_trap && ignore_return == 0 && invert == 0 && exec_result != EXECUTION_SUCCESS) |
2736 | { | |
2737 | last_command_exit_value = exec_result; | |
89a92869 CR |
2738 | save_line_number = line_number; |
2739 | line_number = line_number_for_err_trap; | |
17345e5a | 2740 | run_error_trap (); |
89a92869 | 2741 | line_number = save_line_number; |
17345e5a JA |
2742 | } |
2743 | ||
2744 | if (ignore_return == 0 && invert == 0 && exit_immediately_on_error && exec_result != EXECUTION_SUCCESS) | |
2745 | { | |
2746 | last_command_exit_value = exec_result; | |
2747 | run_pending_traps (); | |
2748 | jump_to_top_level (ERREXIT); | |
2749 | } | |
2750 | ||
726f6388 JA |
2751 | break; |
2752 | ||
ccc6cda3 JA |
2753 | case AND_AND: |
2754 | case OR_OR: | |
2755 | if (asynchronous) | |
2756 | { | |
2757 | /* If we have something like `a && b &' or `a || b &', run the | |
2758 | && or || stuff in a subshell. Force a subshell and just call | |
2759 | execute_command_internal again. Leave asynchronous on | |
2760 | so that we get a report from the parent shell about the | |
2761 | background job. */ | |
2762 | command->flags |= CMD_FORCE_SUBSHELL; | |
2763 | exec_result = execute_command_internal (command, 1, pipe_in, pipe_out, fds_to_close); | |
2764 | break; | |
2765 | } | |
726f6388 | 2766 | |
ccc6cda3 JA |
2767 | /* Execute the first command. If the result of that is successful |
2768 | and the connector is AND_AND, or the result is not successful | |
2769 | and the connector is OR_OR, then execute the second command, | |
2770 | otherwise return. */ | |
726f6388 | 2771 | |
3185942a | 2772 | executing_list++; |
ccc6cda3 JA |
2773 | if (command->value.Connection->first) |
2774 | command->value.Connection->first->flags |= CMD_IGNORE_RETURN; | |
726f6388 | 2775 | |
8868edaf | 2776 | #if 1 |
ccc6cda3 | 2777 | exec_result = execute_command (command->value.Connection->first); |
8868edaf CR |
2778 | #else |
2779 | exec_result = execute_command_internal (command->value.Connection->first, 0, NO_PIPE, NO_PIPE, fds_to_close); | |
2780 | #endif | |
ccc6cda3 JA |
2781 | QUIT; |
2782 | if (((command->value.Connection->connector == AND_AND) && | |
2783 | (exec_result == EXECUTION_SUCCESS)) || | |
2784 | ((command->value.Connection->connector == OR_OR) && | |
2785 | (exec_result != EXECUTION_SUCCESS))) | |
2786 | { | |
41f5420d CR |
2787 | optimize_fork (command); |
2788 | ||
a0c0a00f CR |
2789 | second = command->value.Connection->second; |
2790 | if (ignore_return && second) | |
2791 | second->flags |= CMD_IGNORE_RETURN; | |
726f6388 | 2792 | |
a0c0a00f | 2793 | exec_result = execute_command (second); |
ccc6cda3 | 2794 | } |
3185942a | 2795 | executing_list--; |
ccc6cda3 JA |
2796 | break; |
2797 | ||
2798 | default: | |
b72432fd | 2799 | command_error ("execute_connection", CMDERR_BADCONN, command->value.Connection->connector, 0); |
ccc6cda3 JA |
2800 | jump_to_top_level (DISCARD); |
2801 | exec_result = EXECUTION_FAILURE; | |
726f6388 JA |
2802 | } |
2803 | ||
ccc6cda3 | 2804 | return exec_result; |
726f6388 JA |
2805 | } |
2806 | ||
a0c0a00f CR |
2807 | /* The test used to be only for interactive_shell, but we don't want to report |
2808 | job status when the shell is not interactive or when job control isn't | |
2809 | enabled. */ | |
bb70624e JA |
2810 | #define REAP() \ |
2811 | do \ | |
2812 | { \ | |
a0c0a00f | 2813 | if (job_control == 0 || interactive_shell == 0) \ |
bb70624e JA |
2814 | reap_dead_jobs (); \ |
2815 | } \ | |
2816 | while (0) | |
726f6388 JA |
2817 | |
2818 | /* Execute a FOR command. The syntax is: FOR word_desc IN word_list; | |
2819 | DO command; DONE */ | |
ccc6cda3 | 2820 | static int |
726f6388 JA |
2821 | execute_for_command (for_command) |
2822 | FOR_COM *for_command; | |
2823 | { | |
726f6388 | 2824 | register WORD_LIST *releaser, *list; |
ccc6cda3 | 2825 | SHELL_VAR *v; |
726f6388 | 2826 | char *identifier; |
b80f6443 | 2827 | int retval, save_line_number; |
ccc6cda3 | 2828 | #if 0 |
726f6388 | 2829 | SHELL_VAR *old_value = (SHELL_VAR *)NULL; /* Remember the old value of x. */ |
ccc6cda3 | 2830 | #endif |
726f6388 | 2831 | |
b80f6443 | 2832 | save_line_number = line_number; |
726f6388 | 2833 | if (check_identifier (for_command->name, 1) == 0) |
ccc6cda3 JA |
2834 | { |
2835 | if (posixly_correct && interactive_shell == 0) | |
cce855bc | 2836 | { |
3185942a | 2837 | last_command_exit_value = EX_BADUSAGE; |
b80f6443 | 2838 | jump_to_top_level (ERREXIT); |
cce855bc | 2839 | } |
ccc6cda3 JA |
2840 | return (EXECUTION_FAILURE); |
2841 | } | |
726f6388 JA |
2842 | |
2843 | loop_level++; | |
2844 | identifier = for_command->name->word; | |
2845 | ||
ac50fbac | 2846 | line_number = for_command->line; /* for expansion error messages */ |
726f6388 JA |
2847 | list = releaser = expand_words_no_vars (for_command->map_list); |
2848 | ||
2849 | begin_unwind_frame ("for"); | |
2850 | add_unwind_protect (dispose_words, releaser); | |
2851 | ||
ccc6cda3 | 2852 | #if 0 |
726f6388 JA |
2853 | if (lexical_scoping) |
2854 | { | |
2855 | old_value = copy_variable (find_variable (identifier)); | |
2856 | if (old_value) | |
2857 | add_unwind_protect (dispose_variable, old_value); | |
2858 | } | |
ccc6cda3 | 2859 | #endif |
726f6388 JA |
2860 | |
2861 | if (for_command->flags & CMD_IGNORE_RETURN) | |
2862 | for_command->action->flags |= CMD_IGNORE_RETURN; | |
2863 | ||
ccc6cda3 | 2864 | for (retval = EXECUTION_SUCCESS; list; list = list->next) |
726f6388 JA |
2865 | { |
2866 | QUIT; | |
b80f6443 JA |
2867 | |
2868 | line_number = for_command->line; | |
2869 | ||
2870 | /* Remember what this command looks like, for debugger. */ | |
2871 | command_string_index = 0; | |
2872 | print_for_command_head (for_command); | |
2873 | ||
2874 | if (echo_command_at_execute) | |
2875 | xtrace_print_for_command_head (for_command); | |
2876 | ||
95732b49 JA |
2877 | /* Save this command unless it's a trap command and we're not running |
2878 | a debug trap. */ | |
0628567a | 2879 | if (signal_in_progress (DEBUG_TRAP) == 0 && running_trap == 0) |
b80f6443 JA |
2880 | { |
2881 | FREE (the_printed_command_except_trap); | |
2882 | the_printed_command_except_trap = savestring (the_printed_command); | |
2883 | } | |
2884 | ||
2885 | retval = run_debug_trap (); | |
2886 | #if defined (DEBUGGER) | |
2887 | /* In debugging mode, if the DEBUG trap returns a non-zero status, we | |
2888 | skip the command. */ | |
2889 | if (debugging_mode && retval != EXECUTION_SUCCESS) | |
2890 | continue; | |
2891 | #endif | |
2892 | ||
ccc6cda3 | 2893 | this_command_name = (char *)NULL; |
ac50fbac | 2894 | /* XXX - special ksh93 for command index variable handling */ |
a0c0a00f | 2895 | v = find_variable_last_nameref (identifier, 1); |
ac50fbac | 2896 | if (v && nameref_p (v)) |
a0c0a00f CR |
2897 | { |
2898 | if (valid_nameref_value (list->word->word, 1) == 0) | |
2899 | { | |
2900 | sh_invalidid (list->word->word); | |
2901 | v = 0; | |
2902 | } | |
d233b485 CR |
2903 | else if (readonly_p (v)) |
2904 | err_readonly (name_cell (v)); | |
a0c0a00f | 2905 | else |
d233b485 | 2906 | v = bind_variable_value (v, list->word->word, ASS_NAMEREF); |
a0c0a00f | 2907 | } |
ac50fbac | 2908 | else |
a0c0a00f CR |
2909 | v = bind_variable (identifier, list->word->word, 0); |
2910 | ||
2911 | if (v == 0 || readonly_p (v) || noassign_p (v)) | |
ccc6cda3 | 2912 | { |
b80f6443 | 2913 | line_number = save_line_number; |
a0c0a00f | 2914 | if (v && readonly_p (v) && interactive_shell == 0 && posixly_correct) |
ccc6cda3 JA |
2915 | { |
2916 | last_command_exit_value = EXECUTION_FAILURE; | |
2917 | jump_to_top_level (FORCE_EOF); | |
2918 | } | |
2919 | else | |
2920 | { | |
b80f6443 JA |
2921 | dispose_words (releaser); |
2922 | discard_unwind_frame ("for"); | |
d166f048 | 2923 | loop_level--; |
ccc6cda3 JA |
2924 | return (EXECUTION_FAILURE); |
2925 | } | |
2926 | } | |
a0c0a00f CR |
2927 | |
2928 | if (ifsname (identifier)) | |
2929 | setifs (v); | |
8868edaf CR |
2930 | else |
2931 | stupidly_hack_special_variables (identifier); | |
a0c0a00f | 2932 | |
ccc6cda3 | 2933 | retval = execute_command (for_command->action); |
726f6388 JA |
2934 | REAP (); |
2935 | QUIT; | |
2936 | ||
2937 | if (breaking) | |
2938 | { | |
ccc6cda3 | 2939 | breaking--; |
726f6388 JA |
2940 | break; |
2941 | } | |
2942 | ||
2943 | if (continuing) | |
2944 | { | |
2945 | continuing--; | |
2946 | if (continuing) | |
2947 | break; | |
2948 | } | |
726f6388 JA |
2949 | } |
2950 | ||
2951 | loop_level--; | |
b80f6443 | 2952 | line_number = save_line_number; |
726f6388 | 2953 | |
ccc6cda3 | 2954 | #if 0 |
726f6388 JA |
2955 | if (lexical_scoping) |
2956 | { | |
2957 | if (!old_value) | |
7117c2d2 | 2958 | unbind_variable (identifier); |
726f6388 JA |
2959 | else |
2960 | { | |
2961 | SHELL_VAR *new_value; | |
2962 | ||
d233b485 | 2963 | new_value = bind_variable (identifier, value_cell (old_value), 0); |
726f6388 JA |
2964 | new_value->attributes = old_value->attributes; |
2965 | dispose_variable (old_value); | |
2966 | } | |
2967 | } | |
ccc6cda3 | 2968 | #endif |
726f6388 JA |
2969 | |
2970 | dispose_words (releaser); | |
2971 | discard_unwind_frame ("for"); | |
2972 | return (retval); | |
2973 | } | |
2974 | ||
bb70624e JA |
2975 | #if defined (ARITH_FOR_COMMAND) |
2976 | /* Execute an arithmetic for command. The syntax is | |
2977 | ||
2978 | for (( init ; step ; test )) | |
2979 | do | |
2980 | body | |
2981 | done | |
2982 | ||
2983 | The execution should be exactly equivalent to | |
2984 | ||
2985 | eval \(\( init \)\) | |
2986 | while eval \(\( test \)\) ; do | |
2987 | body; | |
2988 | eval \(\( step \)\) | |
2989 | done | |
2990 | */ | |
7117c2d2 | 2991 | static intmax_t |
bb70624e JA |
2992 | eval_arith_for_expr (l, okp) |
2993 | WORD_LIST *l; | |
2994 | int *okp; | |
2995 | { | |
2996 | WORD_LIST *new; | |
7117c2d2 | 2997 | intmax_t expresult; |
b80f6443 | 2998 | int r; |
bb70624e JA |
2999 | |
3000 | new = expand_words_no_vars (l); | |
f73dda09 JA |
3001 | if (new) |
3002 | { | |
3003 | if (echo_command_at_execute) | |
3004 | xtrace_print_arith_cmd (new); | |
7117c2d2 | 3005 | this_command_name = "(("; /* )) for expression error messages */ |
b80f6443 JA |
3006 | |
3007 | command_string_index = 0; | |
3008 | print_arith_command (new); | |
d233b485 | 3009 | if (signal_in_progress (DEBUG_TRAP) == 0 && running_trap == 0) |
95732b49 JA |
3010 | { |
3011 | FREE (the_printed_command_except_trap); | |
3012 | the_printed_command_except_trap = savestring (the_printed_command); | |
3013 | } | |
b80f6443 JA |
3014 | |
3015 | r = run_debug_trap (); | |
3016 | /* In debugging mode, if the DEBUG trap returns a non-zero status, we | |
3017 | skip the command. */ | |
3018 | #if defined (DEBUGGER) | |
3019 | if (debugging_mode == 0 || r == EXECUTION_SUCCESS) | |
d233b485 | 3020 | expresult = evalexp (new->word->word, EXP_EXPANDED, okp); |
b80f6443 JA |
3021 | else |
3022 | { | |
3023 | expresult = 0; | |
3024 | if (okp) | |
3025 | *okp = 1; | |
3026 | } | |
3027 | #else | |
d233b485 | 3028 | expresult = evalexp (new->word->word, EXP_EXPANDED, okp); |
b80f6443 | 3029 | #endif |
f73dda09 JA |
3030 | dispose_words (new); |
3031 | } | |
3032 | else | |
3033 | { | |
3034 | expresult = 0; | |
3035 | if (okp) | |
3036 | *okp = 1; | |
3037 | } | |
bb70624e JA |
3038 | return (expresult); |
3039 | } | |
3040 | ||
3041 | static int | |
3042 | execute_arith_for_command (arith_for_command) | |
3043 | ARITH_FOR_COM *arith_for_command; | |
3044 | { | |
7117c2d2 JA |
3045 | intmax_t expresult; |
3046 | int expok, body_status, arith_lineno, save_lineno; | |
bb70624e JA |
3047 | |
3048 | body_status = EXECUTION_SUCCESS; | |
3049 | loop_level++; | |
b80f6443 | 3050 | save_lineno = line_number; |
bb70624e JA |
3051 | |
3052 | if (arith_for_command->flags & CMD_IGNORE_RETURN) | |
3053 | arith_for_command->action->flags |= CMD_IGNORE_RETURN; | |
3054 | ||
3055 | this_command_name = "(("; /* )) for expression error messages */ | |
3056 | ||
7117c2d2 JA |
3057 | /* save the starting line number of the command so we can reset |
3058 | line_number before executing each expression -- for $LINENO | |
3059 | and the DEBUG trap. */ | |
b80f6443 | 3060 | line_number = arith_lineno = arith_for_command->line; |
d233b485 | 3061 | if (variable_context && interactive_shell && sourcelevel == 0) |
a0c0a00f | 3062 | { |
d233b485 CR |
3063 | /* line numbers in a function start at 1 */ |
3064 | line_number -= function_line_number - 1; | |
3065 | if (line_number <= 0) | |
3066 | line_number = 1; | |
a0c0a00f | 3067 | } |
bb70624e JA |
3068 | |
3069 | /* Evaluate the initialization expression. */ | |
3070 | expresult = eval_arith_for_expr (arith_for_command->init, &expok); | |
3071 | if (expok == 0) | |
b80f6443 JA |
3072 | { |
3073 | line_number = save_lineno; | |
3074 | return (EXECUTION_FAILURE); | |
3075 | } | |
bb70624e JA |
3076 | |
3077 | while (1) | |
3078 | { | |
3079 | /* Evaluate the test expression. */ | |
7117c2d2 | 3080 | line_number = arith_lineno; |
bb70624e | 3081 | expresult = eval_arith_for_expr (arith_for_command->test, &expok); |
7117c2d2 JA |
3082 | line_number = save_lineno; |
3083 | ||
bb70624e JA |
3084 | if (expok == 0) |
3085 | { | |
3086 | body_status = EXECUTION_FAILURE; | |
3087 | break; | |
3088 | } | |
3089 | REAP (); | |
3090 | if (expresult == 0) | |
28ef6c31 | 3091 | break; |
bb70624e JA |
3092 | |
3093 | /* Execute the body of the arithmetic for command. */ | |
3094 | QUIT; | |
3095 | body_status = execute_command (arith_for_command->action); | |
3096 | QUIT; | |
3097 | ||
3098 | /* Handle any `break' or `continue' commands executed by the body. */ | |
3099 | if (breaking) | |
3100 | { | |
3101 | breaking--; | |
3102 | break; | |
3103 | } | |
3104 | ||
3105 | if (continuing) | |
3106 | { | |
3107 | continuing--; | |
3108 | if (continuing) | |
3109 | break; | |
3110 | } | |
3111 | ||
3112 | /* Evaluate the step expression. */ | |
7117c2d2 | 3113 | line_number = arith_lineno; |
bb70624e | 3114 | expresult = eval_arith_for_expr (arith_for_command->step, &expok); |
7117c2d2 JA |
3115 | line_number = save_lineno; |
3116 | ||
bb70624e JA |
3117 | if (expok == 0) |
3118 | { | |
3119 | body_status = EXECUTION_FAILURE; | |
3120 | break; | |
3121 | } | |
3122 | } | |
3123 | ||
3124 | loop_level--; | |
b80f6443 JA |
3125 | line_number = save_lineno; |
3126 | ||
bb70624e JA |
3127 | return (body_status); |
3128 | } | |
3129 | #endif | |
3130 | ||
726f6388 JA |
3131 | #if defined (SELECT_COMMAND) |
3132 | static int LINES, COLS, tabsize; | |
3133 | ||
3134 | #define RP_SPACE ") " | |
3135 | #define RP_SPACE_LEN 2 | |
3136 | ||
3137 | /* XXX - does not handle numbers > 1000000 at all. */ | |
3138 | #define NUMBER_LEN(s) \ | |
3139 | ((s < 10) ? 1 \ | |
3140 | : ((s < 100) ? 2 \ | |
3141 | : ((s < 1000) ? 3 \ | |
3142 | : ((s < 10000) ? 4 \ | |
3143 | : ((s < 100000) ? 5 \ | |
3144 | : 6))))) | |
3145 | ||
495aee44 CR |
3146 | static int |
3147 | displen (s) | |
3148 | const char *s; | |
3149 | { | |
3150 | #if defined (HANDLE_MULTIBYTE) | |
3151 | wchar_t *wcstr; | |
ac50fbac CR |
3152 | size_t slen; |
3153 | int wclen; | |
495aee44 CR |
3154 | |
3155 | wcstr = 0; | |
3156 | slen = mbstowcs (wcstr, s, 0); | |
3157 | if (slen == -1) | |
3158 | slen = 0; | |
3159 | wcstr = (wchar_t *)xmalloc (sizeof (wchar_t) * (slen + 1)); | |
3160 | mbstowcs (wcstr, s, slen + 1); | |
3161 | wclen = wcswidth (wcstr, slen); | |
3162 | free (wcstr); | |
ac50fbac | 3163 | return (wclen < 0 ? STRLEN(s) : wclen); |
495aee44 CR |
3164 | #else |
3165 | return (STRLEN (s)); | |
3166 | #endif | |
3167 | } | |
3168 | ||
726f6388 JA |
3169 | static int |
3170 | print_index_and_element (len, ind, list) | |
3171 | int len, ind; | |
3172 | WORD_LIST *list; | |
3173 | { | |
3174 | register WORD_LIST *l; | |
3175 | register int i; | |
3176 | ||
3177 | if (list == 0) | |
3178 | return (0); | |
ccc6cda3 JA |
3179 | for (i = ind, l = list; l && --i; l = l->next) |
3180 | ; | |
ac50fbac CR |
3181 | if (l == 0) /* don't think this can happen */ |
3182 | return (0); | |
726f6388 | 3183 | fprintf (stderr, "%*d%s%s", len, ind, RP_SPACE, l->word->word); |
495aee44 | 3184 | return (displen (l->word->word)); |
726f6388 JA |
3185 | } |
3186 | ||
3187 | static void | |
3188 | indent (from, to) | |
3189 | int from, to; | |
3190 | { | |
3191 | while (from < to) | |
3192 | { | |
3193 | if ((to / tabsize) > (from / tabsize)) | |
3194 | { | |
3195 | putc ('\t', stderr); | |
3196 | from += tabsize - from % tabsize; | |
3197 | } | |
3198 | else | |
3199 | { | |
3200 | putc (' ', stderr); | |
3201 | from++; | |
3202 | } | |
3203 | } | |
3204 | } | |
3205 | ||
3206 | static void | |
3207 | print_select_list (list, list_len, max_elem_len, indices_len) | |
3208 | WORD_LIST *list; | |
3209 | int list_len, max_elem_len, indices_len; | |
3210 | { | |
3211 | int ind, row, elem_len, pos, cols, rows; | |
3212 | int first_column_indices_len, other_indices_len; | |
3213 | ||
3214 | if (list == 0) | |
3215 | { | |
3216 | putc ('\n', stderr); | |
3217 | return; | |
3218 | } | |
3219 | ||
ccc6cda3 | 3220 | cols = max_elem_len ? COLS / max_elem_len : 1; |
726f6388 JA |
3221 | if (cols == 0) |
3222 | cols = 1; | |
3223 | rows = list_len ? list_len / cols + (list_len % cols != 0) : 1; | |
3224 | cols = list_len ? list_len / rows + (list_len % rows != 0) : 1; | |
3225 | ||
3226 | if (rows == 1) | |
3227 | { | |
3228 | rows = cols; | |
3229 | cols = 1; | |
3230 | } | |
3231 | ||
3232 | first_column_indices_len = NUMBER_LEN (rows); | |
3233 | other_indices_len = indices_len; | |
3234 | ||
3235 | for (row = 0; row < rows; row++) | |
3236 | { | |
3237 | ind = row; | |
3238 | pos = 0; | |
3239 | while (1) | |
3240 | { | |
3241 | indices_len = (pos == 0) ? first_column_indices_len : other_indices_len; | |
3242 | elem_len = print_index_and_element (indices_len, ind + 1, list); | |
3243 | elem_len += indices_len + RP_SPACE_LEN; | |
3244 | ind += rows; | |
3245 | if (ind >= list_len) | |
3246 | break; | |
3247 | indent (pos + elem_len, pos + max_elem_len); | |
3248 | pos += max_elem_len; | |
3249 | } | |
3250 | putc ('\n', stderr); | |
3251 | } | |
3252 | } | |
3253 | ||
3254 | /* Print the elements of LIST, one per line, preceded by an index from 1 to | |
3255 | LIST_LEN. Then display PROMPT and wait for the user to enter a number. | |
3256 | If the number is between 1 and LIST_LEN, return that selection. If EOF | |
e8ce775d JA |
3257 | is read, return a null string. If a blank line is entered, or an invalid |
3258 | number is entered, the loop is executed again. */ | |
726f6388 | 3259 | static char * |
7117c2d2 | 3260 | select_query (list, list_len, prompt, print_menu) |
726f6388 JA |
3261 | WORD_LIST *list; |
3262 | int list_len; | |
3263 | char *prompt; | |
7117c2d2 | 3264 | int print_menu; |
726f6388 | 3265 | { |
8868edaf | 3266 | int max_elem_len, indices_len, len, r, oe; |
7117c2d2 | 3267 | intmax_t reply; |
726f6388 JA |
3268 | WORD_LIST *l; |
3269 | char *repl_string, *t; | |
3270 | ||
d233b485 | 3271 | COLS = default_columns (); |
726f6388 JA |
3272 | |
3273 | #if 0 | |
3274 | t = get_string_value ("TABSIZE"); | |
3275 | tabsize = (t && *t) ? atoi (t) : 8; | |
3276 | if (tabsize <= 0) | |
3277 | tabsize = 8; | |
3278 | #else | |
3279 | tabsize = 8; | |
3280 | #endif | |
3281 | ||
3282 | max_elem_len = 0; | |
3283 | for (l = list; l; l = l->next) | |
3284 | { | |
495aee44 | 3285 | len = displen (l->word->word); |
726f6388 | 3286 | if (len > max_elem_len) |
cce855bc | 3287 | max_elem_len = len; |
726f6388 JA |
3288 | } |
3289 | indices_len = NUMBER_LEN (list_len); | |
3290 | max_elem_len += indices_len + RP_SPACE_LEN + 2; | |
3291 | ||
3292 | while (1) | |
3293 | { | |
7117c2d2 JA |
3294 | if (print_menu) |
3295 | print_select_list (list, list_len, max_elem_len, indices_len); | |
ccc6cda3 JA |
3296 | fprintf (stderr, "%s", prompt); |
3297 | fflush (stderr); | |
726f6388 JA |
3298 | QUIT; |
3299 | ||
8868edaf CR |
3300 | oe = executing_builtin; |
3301 | executing_builtin = 1; | |
3302 | r = read_builtin ((WORD_LIST *)NULL); | |
3303 | executing_builtin = oe; | |
3304 | if (r != EXECUTION_SUCCESS) | |
726f6388 JA |
3305 | { |
3306 | putchar ('\n'); | |
3307 | return ((char *)NULL); | |
3308 | } | |
3309 | repl_string = get_string_value ("REPLY"); | |
a0c0a00f CR |
3310 | if (repl_string == 0) |
3311 | return ((char *)NULL); | |
726f6388 | 3312 | if (*repl_string == 0) |
7117c2d2 JA |
3313 | { |
3314 | print_menu = 1; | |
3315 | continue; | |
3316 | } | |
e8ce775d | 3317 | if (legal_number (repl_string, &reply) == 0) |
cce855bc | 3318 | return ""; |
726f6388 JA |
3319 | if (reply < 1 || reply > list_len) |
3320 | return ""; | |
3321 | ||
ccc6cda3 JA |
3322 | for (l = list; l && --reply; l = l->next) |
3323 | ; | |
ac50fbac | 3324 | return (l->word->word); /* XXX - can't be null? */ |
726f6388 JA |
3325 | } |
3326 | } | |
3327 | ||
3328 | /* Execute a SELECT command. The syntax is: | |
3329 | SELECT word IN list DO command_list DONE | |
3330 | Only `break' or `return' in command_list will terminate | |
3331 | the command. */ | |
ccc6cda3 | 3332 | static int |
726f6388 JA |
3333 | execute_select_command (select_command) |
3334 | SELECT_COM *select_command; | |
3335 | { | |
3336 | WORD_LIST *releaser, *list; | |
ccc6cda3 | 3337 | SHELL_VAR *v; |
726f6388 | 3338 | char *identifier, *ps3_prompt, *selection; |
b80f6443 | 3339 | int retval, list_len, show_menu, save_line_number; |
7117c2d2 | 3340 | |
726f6388 JA |
3341 | if (check_identifier (select_command->name, 1) == 0) |
3342 | return (EXECUTION_FAILURE); | |
3343 | ||
b80f6443 JA |
3344 | save_line_number = line_number; |
3345 | line_number = select_command->line; | |
3346 | ||
3347 | command_string_index = 0; | |
3348 | print_select_command_head (select_command); | |
3349 | ||
3350 | if (echo_command_at_execute) | |
3351 | xtrace_print_select_command_head (select_command); | |
3352 | ||
0628567a | 3353 | #if 0 |
95732b49 | 3354 | if (signal_in_progress (DEBUG_TRAP) == 0 && (this_command_name == 0 || (STREQ (this_command_name, "trap") == 0))) |
0628567a JA |
3355 | #else |
3356 | if (signal_in_progress (DEBUG_TRAP) == 0 && running_trap == 0) | |
3357 | #endif | |
95732b49 JA |
3358 | { |
3359 | FREE (the_printed_command_except_trap); | |
3360 | the_printed_command_except_trap = savestring (the_printed_command); | |
3361 | } | |
b80f6443 JA |
3362 | |
3363 | retval = run_debug_trap (); | |
3364 | #if defined (DEBUGGER) | |
3365 | /* In debugging mode, if the DEBUG trap returns a non-zero status, we | |
3366 | skip the command. */ | |
3367 | if (debugging_mode && retval != EXECUTION_SUCCESS) | |
3368 | return (EXECUTION_SUCCESS); | |
3369 | #endif | |
3370 | ||
726f6388 JA |
3371 | loop_level++; |
3372 | identifier = select_command->name->word; | |
3373 | ||
3374 | /* command and arithmetic substitution, parameter and variable expansion, | |
3375 | word splitting, pathname expansion, and quote removal. */ | |
3376 | list = releaser = expand_words_no_vars (select_command->map_list); | |
3377 | list_len = list_length (list); | |
3378 | if (list == 0 || list_len == 0) | |
3379 | { | |
3380 | if (list) | |
3381 | dispose_words (list); | |
b80f6443 | 3382 | line_number = save_line_number; |
726f6388 JA |
3383 | return (EXECUTION_SUCCESS); |
3384 | } | |
3385 | ||
3386 | begin_unwind_frame ("select"); | |
3387 | add_unwind_protect (dispose_words, releaser); | |
3388 | ||
726f6388 JA |
3389 | if (select_command->flags & CMD_IGNORE_RETURN) |
3390 | select_command->action->flags |= CMD_IGNORE_RETURN; | |
3391 | ||
ccc6cda3 | 3392 | retval = EXECUTION_SUCCESS; |
7117c2d2 | 3393 | show_menu = 1; |
ccc6cda3 | 3394 | |
726f6388 JA |
3395 | while (1) |
3396 | { | |
b80f6443 | 3397 | line_number = select_command->line; |
726f6388 | 3398 | ps3_prompt = get_string_value ("PS3"); |
ccc6cda3 | 3399 | if (ps3_prompt == 0) |
726f6388 JA |
3400 | ps3_prompt = "#? "; |
3401 | ||
3402 | QUIT; | |
7117c2d2 | 3403 | selection = select_query (list, list_len, ps3_prompt, show_menu); |
726f6388 JA |
3404 | QUIT; |
3405 | if (selection == 0) | |
7117c2d2 JA |
3406 | { |
3407 | /* select_query returns EXECUTION_FAILURE if the read builtin | |
3408 | fails, so we want to return failure in this case. */ | |
3409 | retval = EXECUTION_FAILURE; | |
3410 | break; | |
3411 | } | |
ccc6cda3 | 3412 | |
95732b49 | 3413 | v = bind_variable (identifier, selection, 0); |
a0c0a00f | 3414 | if (v == 0 || readonly_p (v) || noassign_p (v)) |
ccc6cda3 | 3415 | { |
a0c0a00f | 3416 | if (v && readonly_p (v) && interactive_shell == 0 && posixly_correct) |
ccc6cda3 JA |
3417 | { |
3418 | last_command_exit_value = EXECUTION_FAILURE; | |
3419 | jump_to_top_level (FORCE_EOF); | |
3420 | } | |
3421 | else | |
3422 | { | |
b80f6443 JA |
3423 | dispose_words (releaser); |
3424 | discard_unwind_frame ("select"); | |
3425 | loop_level--; | |
3426 | line_number = save_line_number; | |
ccc6cda3 JA |
3427 | return (EXECUTION_FAILURE); |
3428 | } | |
3429 | } | |
726f6388 | 3430 | |
8868edaf CR |
3431 | stupidly_hack_special_variables (identifier); |
3432 | ||
f73dda09 | 3433 | retval = execute_command (select_command->action); |
726f6388 JA |
3434 | |
3435 | REAP (); | |
3436 | QUIT; | |
3437 | ||
3438 | if (breaking) | |
3439 | { | |
3440 | breaking--; | |
3441 | break; | |
3442 | } | |
bb70624e JA |
3443 | |
3444 | if (continuing) | |
3445 | { | |
3446 | continuing--; | |
3447 | if (continuing) | |
3448 | break; | |
3449 | } | |
7117c2d2 JA |
3450 | |
3451 | #if defined (KSH_COMPATIBLE_SELECT) | |
3452 | show_menu = 0; | |
3453 | selection = get_string_value ("REPLY"); | |
3454 | if (selection && *selection == '\0') | |
3455 | show_menu = 1; | |
3456 | #endif | |
726f6388 JA |
3457 | } |
3458 | ||
3459 | loop_level--; | |
b80f6443 | 3460 | line_number = save_line_number; |
726f6388 | 3461 | |
b80f6443 JA |
3462 | dispose_words (releaser); |
3463 | discard_unwind_frame ("select"); | |
726f6388 JA |
3464 | return (retval); |
3465 | } | |
3466 | #endif /* SELECT_COMMAND */ | |
3467 | ||
3468 | /* Execute a CASE command. The syntax is: CASE word_desc IN pattern_list ESAC. | |
3469 | The pattern_list is a linked list of pattern clauses; each clause contains | |
3470 | some patterns to compare word_desc against, and an associated command to | |
3471 | execute. */ | |
ccc6cda3 | 3472 | static int |
726f6388 JA |
3473 | execute_case_command (case_command) |
3474 | CASE_COM *case_command; | |
3475 | { | |
3476 | register WORD_LIST *list; | |
ccc6cda3 | 3477 | WORD_LIST *wlist, *es; |
726f6388 | 3478 | PATTERN_LIST *clauses; |
ccc6cda3 | 3479 | char *word, *pattern; |
d233b485 | 3480 | int retval, match, ignore_return, save_line_number, qflags; |
b80f6443 JA |
3481 | |
3482 | save_line_number = line_number; | |
3483 | line_number = case_command->line; | |
3484 | ||
3485 | command_string_index = 0; | |
3486 | print_case_command_head (case_command); | |
3487 | ||
3488 | if (echo_command_at_execute) | |
3489 | xtrace_print_case_command_head (case_command); | |
3490 | ||
0628567a JA |
3491 | #if 0 |
3492 | if (signal_in_progress (DEBUG_TRAP) == 0 && (this_command_name == 0 || (STREQ (this_command_name, "trap") == 0))) | |
3493 | #else | |
3494 | if (signal_in_progress (DEBUG_TRAP) == 0 && running_trap == 0) | |
3495 | #endif | |
b80f6443 JA |
3496 | { |
3497 | FREE (the_printed_command_except_trap); | |
3498 | the_printed_command_except_trap = savestring (the_printed_command); | |
3499 | } | |
3500 | ||
3501 | retval = run_debug_trap(); | |
3502 | #if defined (DEBUGGER) | |
3503 | /* In debugging mode, if the DEBUG trap returns a non-zero status, we | |
3504 | skip the command. */ | |
3505 | if (debugging_mode && retval != EXECUTION_SUCCESS) | |
3506 | { | |
3507 | line_number = save_line_number; | |
3508 | return (EXECUTION_SUCCESS); | |
3509 | } | |
3510 | #endif | |
726f6388 | 3511 | |
d233b485 CR |
3512 | /* Use the same expansions (the ones POSIX specifies) as the patterns; |
3513 | dequote the resulting string (as POSIX specifies) since the quotes in | |
3514 | patterns are handled specially below. We have to do it in this order | |
3515 | because we're not supposed to perform word splitting. */ | |
3516 | wlist = expand_word_leave_quoted (case_command->word, 0); | |
3517 | if (wlist) | |
3518 | { | |
3519 | char *t; | |
3520 | t = string_list (wlist); | |
3521 | word = dequote_string (t); | |
3522 | free (t); | |
3523 | } | |
3524 | else | |
3525 | word = savestring (""); | |
ccc6cda3 JA |
3526 | dispose_words (wlist); |
3527 | ||
726f6388 | 3528 | retval = EXECUTION_SUCCESS; |
ccc6cda3 | 3529 | ignore_return = case_command->flags & CMD_IGNORE_RETURN; |
726f6388 JA |
3530 | |
3531 | begin_unwind_frame ("case"); | |
a0c0a00f | 3532 | add_unwind_protect (xfree, word); |
726f6388 | 3533 | |
ccc6cda3 JA |
3534 | #define EXIT_CASE() goto exit_case_command |
3535 | ||
3536 | for (clauses = case_command->clauses; clauses; clauses = clauses->next) | |
726f6388 JA |
3537 | { |
3538 | QUIT; | |
ccc6cda3 | 3539 | for (list = clauses->patterns; list; list = list->next) |
726f6388 | 3540 | { |
726f6388 JA |
3541 | es = expand_word_leave_quoted (list->word, 0); |
3542 | ||
3543 | if (es && es->word && es->word->word && *(es->word->word)) | |
d233b485 CR |
3544 | { |
3545 | /* Convert quoted null strings into empty strings. */ | |
3546 | qflags = QGLOB_CVTNULL; | |
3547 | ||
3548 | /* We left CTLESC in place quoting CTLESC and CTLNUL after the | |
3549 | call to expand_word_leave_quoted; tell quote_string_for_globbing | |
3550 | to remove those here. This works for both unquoted portions of | |
3551 | the word (which call quote_escapes) and quoted portions | |
3552 | (which call quote_string). */ | |
3553 | qflags |= QGLOB_CTLESC; | |
3554 | pattern = quote_string_for_globbing (es->word->word, qflags); | |
3555 | } | |
726f6388 | 3556 | else |
ccc6cda3 | 3557 | { |
f73dda09 | 3558 | pattern = (char *)xmalloc (1); |
ccc6cda3 JA |
3559 | pattern[0] = '\0'; |
3560 | } | |
726f6388 JA |
3561 | |
3562 | /* Since the pattern does not undergo quote removal (as per | |
f73dda09 | 3563 | Posix.2, section 3.9.4.3), the strmatch () call must be able |
726f6388 | 3564 | to recognize backslashes as escape characters. */ |
95732b49 | 3565 | match = strmatch (pattern, word, FNMATCH_EXTFLAG|FNMATCH_IGNCASE) != FNM_NOMATCH; |
726f6388 JA |
3566 | free (pattern); |
3567 | ||
3568 | dispose_words (es); | |
3569 | ||
3570 | if (match) | |
3571 | { | |
3185942a JA |
3572 | do |
3573 | { | |
3574 | if (clauses->action && ignore_return) | |
3575 | clauses->action->flags |= CMD_IGNORE_RETURN; | |
3576 | retval = execute_command (clauses->action); | |
3577 | } | |
3578 | while ((clauses->flags & CASEPAT_FALLTHROUGH) && (clauses = clauses->next)); | |
89a92869 | 3579 | if (clauses == 0 || (clauses->flags & CASEPAT_TESTNEXT) == 0) |
3185942a JA |
3580 | EXIT_CASE (); |
3581 | else | |
3582 | break; | |
726f6388 JA |
3583 | } |
3584 | ||
726f6388 JA |
3585 | QUIT; |
3586 | } | |
726f6388 JA |
3587 | } |
3588 | ||
ccc6cda3 JA |
3589 | exit_case_command: |
3590 | free (word); | |
726f6388 | 3591 | discard_unwind_frame ("case"); |
b80f6443 | 3592 | line_number = save_line_number; |
726f6388 JA |
3593 | return (retval); |
3594 | } | |
3595 | ||
3596 | #define CMD_WHILE 0 | |
3597 | #define CMD_UNTIL 1 | |
3598 | ||
3599 | /* The WHILE command. Syntax: WHILE test DO action; DONE. | |
3600 | Repeatedly execute action while executing test produces | |
3601 | EXECUTION_SUCCESS. */ | |
ccc6cda3 | 3602 | static int |
726f6388 JA |
3603 | execute_while_command (while_command) |
3604 | WHILE_COM *while_command; | |
3605 | { | |
3606 | return (execute_while_or_until (while_command, CMD_WHILE)); | |
3607 | } | |
3608 | ||
3609 | /* UNTIL is just like WHILE except that the test result is negated. */ | |
ccc6cda3 | 3610 | static int |
726f6388 JA |
3611 | execute_until_command (while_command) |
3612 | WHILE_COM *while_command; | |
3613 | { | |
3614 | return (execute_while_or_until (while_command, CMD_UNTIL)); | |
3615 | } | |
3616 | ||
3617 | /* The body for both while and until. The only difference between the | |
3618 | two is that the test value is treated differently. TYPE is | |
3619 | CMD_WHILE or CMD_UNTIL. The return value for both commands should | |
3620 | be EXECUTION_SUCCESS if no commands in the body are executed, and | |
3621 | the status of the last command executed in the body otherwise. */ | |
ccc6cda3 | 3622 | static int |
726f6388 JA |
3623 | execute_while_or_until (while_command, type) |
3624 | WHILE_COM *while_command; | |
3625 | int type; | |
3626 | { | |
3627 | int return_value, body_status; | |
3628 | ||
3629 | body_status = EXECUTION_SUCCESS; | |
3630 | loop_level++; | |
3631 | ||
3632 | while_command->test->flags |= CMD_IGNORE_RETURN; | |
3633 | if (while_command->flags & CMD_IGNORE_RETURN) | |
3634 | while_command->action->flags |= CMD_IGNORE_RETURN; | |
3635 | ||
3636 | while (1) | |
3637 | { | |
3638 | return_value = execute_command (while_command->test); | |
3639 | REAP (); | |
3640 | ||
f73dda09 JA |
3641 | /* Need to handle `break' in the test when we would break out of the |
3642 | loop. The job control code will set `breaking' to loop_level | |
3643 | when a job in a loop is stopped with SIGTSTP. If the stopped job | |
3644 | is in the loop test, `breaking' will not be reset unless we do | |
a0c0a00f CR |
3645 | this, and the shell will cease to execute commands. The same holds |
3646 | true for `continue'. */ | |
726f6388 | 3647 | if (type == CMD_WHILE && return_value != EXECUTION_SUCCESS) |
f73dda09 JA |
3648 | { |
3649 | if (breaking) | |
3650 | breaking--; | |
a0c0a00f CR |
3651 | if (continuing) |
3652 | continuing--; | |
f73dda09 JA |
3653 | break; |
3654 | } | |
726f6388 | 3655 | if (type == CMD_UNTIL && return_value == EXECUTION_SUCCESS) |
f73dda09 JA |
3656 | { |
3657 | if (breaking) | |
3658 | breaking--; | |
a0c0a00f CR |
3659 | if (continuing) |
3660 | continuing--; | |
f73dda09 JA |
3661 | break; |
3662 | } | |
726f6388 JA |
3663 | |
3664 | QUIT; | |
3665 | body_status = execute_command (while_command->action); | |
3666 | QUIT; | |
3667 | ||
3668 | if (breaking) | |
3669 | { | |
3670 | breaking--; | |
3671 | break; | |
3672 | } | |
3673 | ||
3674 | if (continuing) | |
3675 | { | |
3676 | continuing--; | |
3677 | if (continuing) | |
3678 | break; | |
3679 | } | |
3680 | } | |
3681 | loop_level--; | |
3682 | ||
3683 | return (body_status); | |
3684 | } | |
3685 | ||
3686 | /* IF test THEN command [ELSE command]. | |
3687 | IF also allows ELIF in the place of ELSE IF, but | |
3688 | the parser makes *that* stupidity transparent. */ | |
ccc6cda3 | 3689 | static int |
726f6388 JA |
3690 | execute_if_command (if_command) |
3691 | IF_COM *if_command; | |
3692 | { | |
b80f6443 | 3693 | int return_value, save_line_number; |
726f6388 | 3694 | |
b80f6443 | 3695 | save_line_number = line_number; |
726f6388 JA |
3696 | if_command->test->flags |= CMD_IGNORE_RETURN; |
3697 | return_value = execute_command (if_command->test); | |
b80f6443 | 3698 | line_number = save_line_number; |
726f6388 JA |
3699 | |
3700 | if (return_value == EXECUTION_SUCCESS) | |
3701 | { | |
3702 | QUIT; | |
ccc6cda3 | 3703 | |
726f6388 | 3704 | if (if_command->true_case && (if_command->flags & CMD_IGNORE_RETURN)) |
ccc6cda3 JA |
3705 | if_command->true_case->flags |= CMD_IGNORE_RETURN; |
3706 | ||
726f6388 JA |
3707 | return (execute_command (if_command->true_case)); |
3708 | } | |
3709 | else | |
3710 | { | |
3711 | QUIT; | |
3712 | ||
3713 | if (if_command->false_case && (if_command->flags & CMD_IGNORE_RETURN)) | |
3714 | if_command->false_case->flags |= CMD_IGNORE_RETURN; | |
3715 | ||
3716 | return (execute_command (if_command->false_case)); | |
3717 | } | |
3718 | } | |
3719 | ||
cce855bc JA |
3720 | #if defined (DPAREN_ARITHMETIC) |
3721 | static int | |
3722 | execute_arith_command (arith_command) | |
3723 | ARITH_COM *arith_command; | |
3724 | { | |
b80f6443 | 3725 | int expok, save_line_number, retval; |
7117c2d2 | 3726 | intmax_t expresult; |
f73dda09 | 3727 | WORD_LIST *new; |
8868edaf | 3728 | char *exp, *t; |
cce855bc | 3729 | |
f73dda09 | 3730 | expresult = 0; |
cce855bc | 3731 | |
b80f6443 | 3732 | save_line_number = line_number; |
b72432fd | 3733 | this_command_name = "(("; /* )) */ |
d233b485 | 3734 | line_number_for_err_trap = line_number = arith_command->line; |
cce855bc | 3735 | /* If we're in a function, update the line number information. */ |
d233b485 | 3736 | if (variable_context && interactive_shell && sourcelevel == 0) |
a0c0a00f | 3737 | { |
d233b485 CR |
3738 | /* line numbers in a function start at 1 */ |
3739 | line_number -= function_line_number - 1; | |
3740 | if (line_number <= 0) | |
3741 | line_number = 1; | |
a0c0a00f | 3742 | } |
b80f6443 JA |
3743 | |
3744 | command_string_index = 0; | |
3745 | print_arith_command (arith_command->exp); | |
95732b49 | 3746 | |
d233b485 | 3747 | if (signal_in_progress (DEBUG_TRAP) == 0 && running_trap == 0) |
95732b49 JA |
3748 | { |
3749 | FREE (the_printed_command_except_trap); | |
3750 | the_printed_command_except_trap = savestring (the_printed_command); | |
3751 | } | |
cce855bc | 3752 | |
7117c2d2 JA |
3753 | /* Run the debug trap before each arithmetic command, but do it after we |
3754 | update the line number information and before we expand the various | |
3755 | words in the expression. */ | |
b80f6443 JA |
3756 | retval = run_debug_trap (); |
3757 | #if defined (DEBUGGER) | |
3758 | /* In debugging mode, if the DEBUG trap returns a non-zero status, we | |
3759 | skip the command. */ | |
3760 | if (debugging_mode && retval != EXECUTION_SUCCESS) | |
3761 | { | |
3762 | line_number = save_line_number; | |
3763 | return (EXECUTION_SUCCESS); | |
3764 | } | |
3765 | #endif | |
7117c2d2 | 3766 | |
8868edaf CR |
3767 | t = (char *)NULL; |
3768 | new = arith_command->exp; | |
3769 | if (new->next) | |
3770 | exp = t = string_list (new); /* just in case */ | |
3771 | else | |
3772 | exp = new->word->word; | |
3773 | ||
3774 | exp = expand_arith_string (exp, Q_DOUBLE_QUOTES|Q_ARITH); | |
cce855bc JA |
3775 | |
3776 | /* If we're tracing, make a new word list with `((' at the front and `))' | |
8868edaf CR |
3777 | at the back and print it. Change xtrace_print_arith_cmd to take a string |
3778 | when I change eval_arith_for_expr to use expand_arith_string(). */ | |
cce855bc | 3779 | if (echo_command_at_execute) |
8868edaf CR |
3780 | { |
3781 | new = make_word_list (make_word (exp ? exp : ""), (WORD_LIST *)NULL); | |
3782 | xtrace_print_arith_cmd (new); | |
3783 | dispose_words (new); | |
3784 | } | |
cce855bc | 3785 | |
8868edaf | 3786 | if (exp) |
b80f6443 | 3787 | { |
d233b485 | 3788 | expresult = evalexp (exp, EXP_EXPANDED, &expok); |
b80f6443 | 3789 | line_number = save_line_number; |
8868edaf | 3790 | free (exp); |
b80f6443 JA |
3791 | } |
3792 | else | |
3793 | { | |
3794 | expresult = 0; | |
3795 | expok = 1; | |
3796 | } | |
8868edaf | 3797 | FREE (t); |
cce855bc JA |
3798 | |
3799 | if (expok == 0) | |
3800 | return (EXECUTION_FAILURE); | |
3801 | ||
f73dda09 | 3802 | return (expresult == 0 ? EXECUTION_FAILURE : EXECUTION_SUCCESS); |
cce855bc JA |
3803 | } |
3804 | #endif /* DPAREN_ARITHMETIC */ | |
3805 | ||
3806 | #if defined (COND_COMMAND) | |
3807 | ||
3185942a | 3808 | static char * const nullstr = ""; |
cce855bc | 3809 | |
ac50fbac | 3810 | /* XXX - can COND ever be NULL when this is called? */ |
cce855bc JA |
3811 | static int |
3812 | execute_cond_node (cond) | |
3813 | COND_COM *cond; | |
3814 | { | |
0001803f | 3815 | int result, invert, patmatch, rmatch, mflags, ignore; |
f73dda09 | 3816 | char *arg1, *arg2; |
ac50fbac CR |
3817 | #if 0 |
3818 | char *t1, *t2; | |
3819 | #endif | |
cce855bc JA |
3820 | |
3821 | invert = (cond->flags & CMD_INVERT_RETURN); | |
0001803f CR |
3822 | ignore = (cond->flags & CMD_IGNORE_RETURN); |
3823 | if (ignore) | |
3824 | { | |
3825 | if (cond->left) | |
3826 | cond->left->flags |= CMD_IGNORE_RETURN; | |
3827 | if (cond->right) | |
3828 | cond->right->flags |= CMD_IGNORE_RETURN; | |
3829 | } | |
3830 | ||
cce855bc JA |
3831 | if (cond->type == COND_EXPR) |
3832 | result = execute_cond_node (cond->left); | |
3833 | else if (cond->type == COND_OR) | |
3834 | { | |
3835 | result = execute_cond_node (cond->left); | |
3836 | if (result != EXECUTION_SUCCESS) | |
3837 | result = execute_cond_node (cond->right); | |
3838 | } | |
3839 | else if (cond->type == COND_AND) | |
3840 | { | |
3841 | result = execute_cond_node (cond->left); | |
3842 | if (result == EXECUTION_SUCCESS) | |
3843 | result = execute_cond_node (cond->right); | |
3844 | } | |
3845 | else if (cond->type == COND_UNARY) | |
3846 | { | |
0001803f CR |
3847 | if (ignore) |
3848 | comsub_ignore_return++; | |
cce855bc | 3849 | arg1 = cond_expand_word (cond->left->op, 0); |
0001803f CR |
3850 | if (ignore) |
3851 | comsub_ignore_return--; | |
cce855bc JA |
3852 | if (arg1 == 0) |
3853 | arg1 = nullstr; | |
3854 | if (echo_command_at_execute) | |
3855 | xtrace_print_cond_term (cond->type, invert, cond->op, arg1, (char *)NULL); | |
3856 | result = unary_test (cond->op->word, arg1) ? EXECUTION_SUCCESS : EXECUTION_FAILURE; | |
3857 | if (arg1 != nullstr) | |
3858 | free (arg1); | |
3859 | } | |
3860 | else if (cond->type == COND_BINARY) | |
3861 | { | |
0628567a | 3862 | rmatch = 0; |
ac50fbac CR |
3863 | patmatch = (((cond->op->word[1] == '=') && (cond->op->word[2] == '\0') && |
3864 | (cond->op->word[0] == '!' || cond->op->word[0] == '=')) || | |
b72432fd | 3865 | (cond->op->word[0] == '=' && cond->op->word[1] == '\0')); |
b80f6443 JA |
3866 | #if defined (COND_REGEXP) |
3867 | rmatch = (cond->op->word[0] == '=' && cond->op->word[1] == '~' && | |
3868 | cond->op->word[2] == '\0'); | |
3869 | #endif | |
cce855bc | 3870 | |
0001803f CR |
3871 | if (ignore) |
3872 | comsub_ignore_return++; | |
cce855bc | 3873 | arg1 = cond_expand_word (cond->left->op, 0); |
0001803f CR |
3874 | if (ignore) |
3875 | comsub_ignore_return--; | |
cce855bc JA |
3876 | if (arg1 == 0) |
3877 | arg1 = nullstr; | |
0001803f CR |
3878 | if (ignore) |
3879 | comsub_ignore_return++; | |
f1be666c JA |
3880 | arg2 = cond_expand_word (cond->right->op, |
3881 | (rmatch && shell_compatibility_level > 31) ? 2 : (patmatch ? 1 : 0)); | |
0001803f CR |
3882 | if (ignore) |
3883 | comsub_ignore_return--; | |
cce855bc JA |
3884 | if (arg2 == 0) |
3885 | arg2 = nullstr; | |
3886 | ||
3887 | if (echo_command_at_execute) | |
3888 | xtrace_print_cond_term (cond->type, invert, cond->op, arg1, arg2); | |
3889 | ||
b80f6443 JA |
3890 | #if defined (COND_REGEXP) |
3891 | if (rmatch) | |
3892 | { | |
3893 | mflags = SHMAT_PWARN; | |
3894 | #if defined (ARRAY_VARS) | |
3895 | mflags |= SHMAT_SUBEXP; | |
3896 | #endif | |
3897 | ||
ac50fbac CR |
3898 | #if 0 |
3899 | t1 = strescape(arg1); | |
3900 | t2 = strescape(arg2); | |
3901 | itrace("execute_cond_node: sh_regmatch on `%s' and `%s'", t1, t2); | |
3902 | free(t1); | |
3903 | free(t2); | |
3904 | #endif | |
3905 | ||
b80f6443 JA |
3906 | result = sh_regmatch (arg1, arg2, mflags); |
3907 | } | |
3908 | else | |
3909 | #endif /* COND_REGEXP */ | |
95732b49 JA |
3910 | { |
3911 | int oe; | |
3912 | oe = extended_glob; | |
3913 | extended_glob = 1; | |
0001803f | 3914 | result = binary_test (cond->op->word, arg1, arg2, TEST_PATMATCH|TEST_ARITHEXP|TEST_LOCALE) |
95732b49 JA |
3915 | ? EXECUTION_SUCCESS |
3916 | : EXECUTION_FAILURE; | |
3917 | extended_glob = oe; | |
3918 | } | |
cce855bc JA |
3919 | if (arg1 != nullstr) |
3920 | free (arg1); | |
3921 | if (arg2 != nullstr) | |
3922 | free (arg2); | |
3923 | } | |
3924 | else | |
3925 | { | |
b72432fd | 3926 | command_error ("execute_cond_node", CMDERR_BADTYPE, cond->type, 0); |
cce855bc JA |
3927 | jump_to_top_level (DISCARD); |
3928 | result = EXECUTION_FAILURE; | |
3929 | } | |
3930 | ||
3931 | if (invert) | |
3932 | result = (result == EXECUTION_SUCCESS) ? EXECUTION_FAILURE : EXECUTION_SUCCESS; | |
3933 | ||
3934 | return result; | |
3935 | } | |
3936 | ||
3937 | static int | |
3938 | execute_cond_command (cond_command) | |
3939 | COND_COM *cond_command; | |
3940 | { | |
b80f6443 | 3941 | int retval, save_line_number; |
cce855bc | 3942 | |
b80f6443 | 3943 | save_line_number = line_number; |
cce855bc JA |
3944 | |
3945 | this_command_name = "[["; | |
d233b485 | 3946 | line_number_for_err_trap = line_number = cond_command->line; |
cce855bc | 3947 | /* If we're in a function, update the line number information. */ |
d233b485 | 3948 | if (variable_context && interactive_shell && sourcelevel == 0) |
a0c0a00f | 3949 | { |
d233b485 CR |
3950 | /* line numbers in a function start at 1 */ |
3951 | line_number -= function_line_number - 1; | |
3952 | if (line_number <= 0) | |
3953 | line_number = 1; | |
a0c0a00f | 3954 | } |
b80f6443 JA |
3955 | command_string_index = 0; |
3956 | print_cond_command (cond_command); | |
95732b49 | 3957 | |
d233b485 | 3958 | if (signal_in_progress (DEBUG_TRAP) == 0 && running_trap == 0) |
95732b49 JA |
3959 | { |
3960 | FREE (the_printed_command_except_trap); | |
3961 | the_printed_command_except_trap = savestring (the_printed_command); | |
3962 | } | |
cce855bc | 3963 | |
7117c2d2 JA |
3964 | /* Run the debug trap before each conditional command, but do it after we |
3965 | update the line number information. */ | |
b80f6443 JA |
3966 | retval = run_debug_trap (); |
3967 | #if defined (DEBUGGER) | |
3968 | /* In debugging mode, if the DEBUG trap returns a non-zero status, we | |
3969 | skip the command. */ | |
3970 | if (debugging_mode && retval != EXECUTION_SUCCESS) | |
3971 | { | |
3972 | line_number = save_line_number; | |
3973 | return (EXECUTION_SUCCESS); | |
3974 | } | |
3975 | #endif | |
7117c2d2 | 3976 | |
cce855bc JA |
3977 | #if 0 |
3978 | debug_print_cond_command (cond_command); | |
3979 | #endif | |
b80f6443 JA |
3980 | |
3981 | last_command_exit_value = retval = execute_cond_node (cond_command); | |
3982 | line_number = save_line_number; | |
3983 | return (retval); | |
cce855bc JA |
3984 | } |
3985 | #endif /* COND_COMMAND */ | |
3986 | ||
726f6388 JA |
3987 | static void |
3988 | bind_lastarg (arg) | |
3989 | char *arg; | |
3990 | { | |
3991 | SHELL_VAR *var; | |
3992 | ||
ccc6cda3 | 3993 | if (arg == 0) |
726f6388 | 3994 | arg = ""; |
95732b49 | 3995 | var = bind_variable ("_", arg, 0); |
a0c0a00f CR |
3996 | if (var) |
3997 | VUNSETATTR (var, att_exported); | |
726f6388 JA |
3998 | } |
3999 | ||
ccc6cda3 JA |
4000 | /* Execute a null command. Fork a subshell if the command uses pipes or is |
4001 | to be run asynchronously. This handles all the side effects that are | |
4002 | supposed to take place. */ | |
4003 | static int | |
95732b49 | 4004 | execute_null_command (redirects, pipe_in, pipe_out, async) |
ccc6cda3 | 4005 | REDIRECT *redirects; |
bb70624e | 4006 | int pipe_in, pipe_out, async; |
ccc6cda3 | 4007 | { |
b80f6443 | 4008 | int r; |
8868edaf | 4009 | int forcefork, fork_flags; |
0001803f | 4010 | REDIRECT *rd; |
b80f6443 | 4011 | |
0001803f | 4012 | for (forcefork = 0, rd = redirects; rd; rd = rd->next) |
d233b485 CR |
4013 | { |
4014 | forcefork += rd->rflags & REDIR_VARASSIGN; | |
4015 | /* Safety */ | |
4016 | forcefork += (rd->redirector.dest == 0 || fd_is_bash_input (rd->redirector.dest)) && (INPUT_REDIRECT (rd->instruction) || TRANSLATE_REDIRECT (rd->instruction) || rd->instruction == r_close_this); | |
4017 | } | |
0001803f CR |
4018 | |
4019 | if (forcefork || pipe_in != NO_PIPE || pipe_out != NO_PIPE || async) | |
ccc6cda3 JA |
4020 | { |
4021 | /* We have a null command, but we really want a subshell to take | |
4022 | care of it. Just fork, do piping and redirections, and exit. */ | |
8868edaf CR |
4023 | fork_flags = async ? FORK_ASYNC : 0; |
4024 | if (make_child ((char *)NULL, fork_flags) == 0) | |
ccc6cda3 JA |
4025 | { |
4026 | /* Cancel traps, in trap.c. */ | |
4027 | restore_original_signals (); /* XXX */ | |
4028 | ||
4029 | do_piping (pipe_in, pipe_out); | |
4030 | ||
3185942a JA |
4031 | #if defined (COPROCESS_SUPPORT) |
4032 | coproc_closeall (); | |
4033 | #endif | |
4034 | ||
d233b485 CR |
4035 | interactive = 0; /* XXX */ |
4036 | ||
3185942a | 4037 | subshell_environment = 0; |
0628567a JA |
4038 | if (async) |
4039 | subshell_environment |= SUBSHELL_ASYNC; | |
4040 | if (pipe_in != NO_PIPE || pipe_out != NO_PIPE) | |
4041 | subshell_environment |= SUBSHELL_PIPE; | |
ccc6cda3 | 4042 | |
b80f6443 | 4043 | if (do_redirections (redirects, RX_ACTIVE) == 0) |
ccc6cda3 JA |
4044 | exit (EXECUTION_SUCCESS); |
4045 | else | |
4046 | exit (EXECUTION_FAILURE); | |
4047 | } | |
4048 | else | |
4049 | { | |
4050 | close_pipes (pipe_in, pipe_out); | |
4051 | #if defined (PROCESS_SUBSTITUTION) && defined (HAVE_DEV_FD) | |
ac50fbac CR |
4052 | if (pipe_out == NO_PIPE) |
4053 | unlink_fifo_list (); | |
ccc6cda3 JA |
4054 | #endif |
4055 | return (EXECUTION_SUCCESS); | |
4056 | } | |
4057 | } | |
4058 | else | |
4059 | { | |
4060 | /* Even if there aren't any command names, pretend to do the | |
4061 | redirections that are specified. The user expects the side | |
4062 | effects to take place. If the redirections fail, then return | |
4063 | failure. Otherwise, if a command substitution took place while | |
4064 | expanding the command or a redirection, return the value of that | |
4065 | substitution. Otherwise, return EXECUTION_SUCCESS. */ | |
4066 | ||
b80f6443 JA |
4067 | r = do_redirections (redirects, RX_ACTIVE|RX_UNDOABLE); |
4068 | cleanup_redirects (redirection_undo_list); | |
4069 | redirection_undo_list = (REDIRECT *)NULL; | |
4070 | ||
4071 | if (r != 0) | |
ccc6cda3 | 4072 | return (EXECUTION_FAILURE); |
95732b49 | 4073 | else if (last_command_subst_pid != NO_PID) |
ccc6cda3 JA |
4074 | return (last_command_exit_value); |
4075 | else | |
4076 | return (EXECUTION_SUCCESS); | |
4077 | } | |
4078 | } | |
4079 | ||
4080 | /* This is a hack to suppress word splitting for assignment statements | |
4081 | given as arguments to builtins with the ASSIGNMENT_BUILTIN flag set. */ | |
4082 | static void | |
4083 | fix_assignment_words (words) | |
4084 | WORD_LIST *words; | |
4085 | { | |
ac50fbac | 4086 | WORD_LIST *w, *wcmd; |
ccc6cda3 | 4087 | struct builtin *b; |
ac50fbac | 4088 | int assoc, global, array, integer; |
ccc6cda3 JA |
4089 | |
4090 | if (words == 0) | |
4091 | return; | |
4092 | ||
7117c2d2 | 4093 | b = 0; |
ac50fbac | 4094 | assoc = global = array = integer = 0; |
ccc6cda3 | 4095 | |
ac50fbac CR |
4096 | /* Skip over assignment statements preceding a command name */ |
4097 | wcmd = words; | |
4098 | for (wcmd = words; wcmd; wcmd = wcmd->next) | |
4099 | if ((wcmd->word->flags & W_ASSIGNMENT) == 0) | |
4100 | break; | |
a0c0a00f CR |
4101 | /* Posix (post-2008) says that `command' doesn't change whether |
4102 | or not the builtin it shadows is a `declaration command', even | |
4103 | though it removes other special builtin properties. In Posix | |
4104 | mode, we skip over one or more instances of `command' and | |
4105 | deal with the next word as the assignment builtin. */ | |
4106 | while (posixly_correct && wcmd && wcmd->word && wcmd->word->word && STREQ (wcmd->word->word, "command")) | |
4107 | wcmd = wcmd->next; | |
ac50fbac CR |
4108 | |
4109 | for (w = wcmd; w; w = w->next) | |
ccc6cda3 | 4110 | if (w->word->flags & W_ASSIGNMENT) |
7117c2d2 | 4111 | { |
a0c0a00f | 4112 | /* Lazy builtin lookup, only do it if we find an assignment */ |
7117c2d2 JA |
4113 | if (b == 0) |
4114 | { | |
ac50fbac | 4115 | b = builtin_address_internal (wcmd->word->word, 0); |
7117c2d2 JA |
4116 | if (b == 0 || (b->flags & ASSIGNMENT_BUILTIN) == 0) |
4117 | return; | |
95732b49 | 4118 | else if (b && (b->flags & ASSIGNMENT_BUILTIN)) |
ac50fbac | 4119 | wcmd->word->flags |= W_ASSNBLTIN; |
7117c2d2 | 4120 | } |
95732b49 | 4121 | w->word->flags |= (W_NOSPLIT|W_NOGLOB|W_TILDEEXP|W_ASSIGNARG); |
3185942a JA |
4122 | #if defined (ARRAY_VARS) |
4123 | if (assoc) | |
4124 | w->word->flags |= W_ASSIGNASSOC; | |
ac50fbac CR |
4125 | if (array) |
4126 | w->word->flags |= W_ASSIGNARRAY; | |
4127 | #endif | |
6d41b715 CR |
4128 | if (global) |
4129 | w->word->flags |= W_ASSNGLOBAL; | |
a0c0a00f CR |
4130 | |
4131 | /* If we have an assignment builtin that does not create local variables, | |
4132 | make sure we create global variables even if we internally call | |
d233b485 CR |
4133 | `declare'. The CHKLOCAL flag means to set attributes or values on |
4134 | an existing local variable, if there is one. */ | |
a0c0a00f | 4135 | if (b && ((b->flags & (ASSIGNMENT_BUILTIN|LOCALVAR_BUILTIN)) == ASSIGNMENT_BUILTIN)) |
d233b485 | 4136 | w->word->flags |= W_ASSNGLOBAL|W_CHKLOCAL; |
8868edaf CR |
4137 | else if (b && (b->flags & ASSIGNMENT_BUILTIN) && (b->flags & LOCALVAR_BUILTIN) && variable_context) |
4138 | w->word->flags |= W_FORCELOCAL; | |
7117c2d2 | 4139 | } |
3185942a JA |
4140 | #if defined (ARRAY_VARS) |
4141 | /* Note that we saw an associative array option to a builtin that takes | |
4142 | assignment statements. This is a bit of a kludge. */ | |
a0c0a00f | 4143 | else if (w->word->word[0] == '-' && (strpbrk (w->word->word+1, "Aag") != 0)) |
6d41b715 CR |
4144 | #else |
4145 | else if (w->word->word[0] == '-' && strchr (w->word->word+1, 'g')) | |
4146 | #endif | |
3185942a JA |
4147 | { |
4148 | if (b == 0) | |
4149 | { | |
ac50fbac | 4150 | b = builtin_address_internal (wcmd->word->word, 0); |
3185942a JA |
4151 | if (b == 0 || (b->flags & ASSIGNMENT_BUILTIN) == 0) |
4152 | return; | |
4153 | else if (b && (b->flags & ASSIGNMENT_BUILTIN)) | |
ac50fbac | 4154 | wcmd->word->flags |= W_ASSNBLTIN; |
3185942a | 4155 | } |
ac50fbac | 4156 | if ((wcmd->word->flags & W_ASSNBLTIN) && strchr (w->word->word+1, 'A')) |
3185942a | 4157 | assoc = 1; |
ac50fbac CR |
4158 | else if ((wcmd->word->flags & W_ASSNBLTIN) && strchr (w->word->word+1, 'a')) |
4159 | array = 1; | |
4160 | if ((wcmd->word->flags & W_ASSNBLTIN) && strchr (w->word->word+1, 'g')) | |
6d41b715 | 4161 | global = 1; |
3185942a | 4162 | } |
3185942a JA |
4163 | } |
4164 | ||
8868edaf CR |
4165 | #ifndef ISOPTION |
4166 | # define ISOPTION(s, c) (s[0] == '-' && s[1] == c && s[2] == 0) | |
4167 | #endif | |
4168 | ||
4169 | #define RETURN_NOT_COMMAND() \ | |
4170 | do { if (typep) *typep = 0; return words; } while (0) | |
4171 | ||
4172 | /* Make sure we have `command [-p] command_name [args]', and handle skipping | |
4173 | over the usual `--' that ends the options. Returns the updated WORDS with | |
4174 | the command and options stripped and sets *TYPEP to a non-zero value. If | |
4175 | any other options are supplied, or there is not a command_name, we punt | |
4176 | and return a zero value in *TYPEP without updating WORDS. */ | |
4177 | static WORD_LIST * | |
4178 | check_command_builtin (words, typep) | |
4179 | WORD_LIST *words; | |
4180 | int *typep; | |
4181 | { | |
4182 | int type; | |
4183 | WORD_LIST *w; | |
4184 | ||
4185 | w = words->next; | |
4186 | type = 1; | |
4187 | ||
4188 | if (w && ISOPTION (w->word->word, 'p')) /* command -p */ | |
4189 | { | |
4190 | #if defined (RESTRICTED_SHELL) | |
4191 | if (restricted) | |
4192 | RETURN_NOT_COMMAND(); | |
4193 | #endif | |
4194 | w = w->next; | |
4195 | type = 2; | |
4196 | } | |
4197 | ||
4198 | if (w && ISOPTION (w->word->word, '-')) /* command [-p] -- */ | |
4199 | w = w->next; | |
4200 | else if (w && w->word->word[0] == '-') /* any other option */ | |
4201 | RETURN_NOT_COMMAND(); | |
4202 | ||
4203 | if (w == 0 || w->word->word == 0) /* must have a command_name */ | |
4204 | RETURN_NOT_COMMAND(); | |
4205 | ||
4206 | if (typep) | |
4207 | *typep = type; | |
4208 | return w; | |
4209 | } | |
4210 | ||
3185942a JA |
4211 | /* Return 1 if the file found by searching $PATH for PATHNAME, defaulting |
4212 | to PATHNAME, is a directory. Used by the autocd code below. */ | |
4213 | static int | |
4214 | is_dirname (pathname) | |
4215 | char *pathname; | |
4216 | { | |
4217 | char *temp; | |
ac50fbac CR |
4218 | int ret; |
4219 | ||
4220 | temp = search_for_command (pathname, 0); | |
a0c0a00f | 4221 | ret = temp ? file_isdir (temp) : file_isdir (pathname); |
ac50fbac CR |
4222 | free (temp); |
4223 | return ret; | |
ccc6cda3 JA |
4224 | } |
4225 | ||
726f6388 JA |
4226 | /* The meaty part of all the executions. We have to start hacking the |
4227 | real execution of commands here. Fork a process, set things up, | |
4228 | execute the command. */ | |
ccc6cda3 | 4229 | static int |
726f6388 JA |
4230 | execute_simple_command (simple_command, pipe_in, pipe_out, async, fds_to_close) |
4231 | SIMPLE_COM *simple_command; | |
4232 | int pipe_in, pipe_out, async; | |
4233 | struct fd_bitmap *fds_to_close; | |
4234 | { | |
4235 | WORD_LIST *words, *lastword; | |
ccc6cda3 | 4236 | char *command_line, *lastarg, *temp; |
bc4cd23c | 4237 | int first_word_quoted, result, builtin_is_special, already_forked, dofork; |
8868edaf | 4238 | int fork_flags, cmdflags; |
95732b49 | 4239 | pid_t old_last_async_pid; |
f73dda09 | 4240 | sh_builtin_func_t *builtin; |
ccc6cda3 | 4241 | SHELL_VAR *func; |
495aee44 | 4242 | volatile int old_builtin, old_command_builtin; |
726f6388 JA |
4243 | |
4244 | result = EXECUTION_SUCCESS; | |
ccc6cda3 | 4245 | special_builtin_failed = builtin_is_special = 0; |
cce855bc | 4246 | command_line = (char *)0; |
726f6388 | 4247 | |
ac50fbac CR |
4248 | QUIT; |
4249 | ||
ccc6cda3 | 4250 | /* If we're in a function, update the line number information. */ |
0001803f | 4251 | if (variable_context && interactive_shell && sourcelevel == 0) |
a0c0a00f | 4252 | { |
d233b485 CR |
4253 | /* line numbers in a function start at 1 */ |
4254 | line_number -= function_line_number - 1; | |
4255 | if (line_number <= 0) | |
4256 | line_number = 1; | |
a0c0a00f | 4257 | } |
7117c2d2 | 4258 | |
726f6388 JA |
4259 | /* Remember what this command line looks like at invocation. */ |
4260 | command_string_index = 0; | |
4261 | print_simple_command (simple_command); | |
726f6388 | 4262 | |
0628567a | 4263 | #if 0 |
95732b49 | 4264 | if (signal_in_progress (DEBUG_TRAP) == 0 && (this_command_name == 0 || (STREQ (this_command_name, "trap") == 0))) |
0628567a JA |
4265 | #else |
4266 | if (signal_in_progress (DEBUG_TRAP) == 0 && running_trap == 0) | |
4267 | #endif | |
b80f6443 JA |
4268 | { |
4269 | FREE (the_printed_command_except_trap); | |
95732b49 | 4270 | the_printed_command_except_trap = the_printed_command ? savestring (the_printed_command) : (char *)0; |
b80f6443 JA |
4271 | } |
4272 | ||
4273 | /* Run the debug trap before each simple command, but do it after we | |
4274 | update the line number information. */ | |
4275 | result = run_debug_trap (); | |
4276 | #if defined (DEBUGGER) | |
4277 | /* In debugging mode, if the DEBUG trap returns a non-zero status, we | |
4278 | skip the command. */ | |
4279 | if (debugging_mode && result != EXECUTION_SUCCESS) | |
4280 | return (EXECUTION_SUCCESS); | |
4281 | #endif | |
4282 | ||
8868edaf CR |
4283 | cmdflags = simple_command->flags; |
4284 | ||
726f6388 | 4285 | first_word_quoted = |
3185942a | 4286 | simple_command->words ? (simple_command->words->word->flags & W_QUOTED) : 0; |
726f6388 | 4287 | |
95732b49 | 4288 | last_command_subst_pid = NO_PID; |
b72432fd | 4289 | old_last_async_pid = last_asynchronous_pid; |
726f6388 | 4290 | |
d233b485 | 4291 | already_forked = 0; |
bc4cd23c JA |
4292 | |
4293 | /* If we're in a pipeline or run in the background, set DOFORK so we | |
4294 | make the child early, before word expansion. This keeps assignment | |
4295 | statements from affecting the parent shell's environment when they | |
4296 | should not. */ | |
4297 | dofork = pipe_in != NO_PIPE || pipe_out != NO_PIPE || async; | |
4298 | ||
4299 | /* Something like `%2 &' should restart job 2 in the background, not cause | |
4300 | the shell to fork here. */ | |
4301 | if (dofork && pipe_in == NO_PIPE && pipe_out == NO_PIPE && | |
4302 | simple_command->words && simple_command->words->word && | |
4303 | simple_command->words->word->word && | |
4304 | (simple_command->words->word->word[0] == '%')) | |
4305 | dofork = 0; | |
4306 | ||
4307 | if (dofork) | |
cce855bc | 4308 | { |
d233b485 CR |
4309 | char *p; |
4310 | ||
bb70624e JA |
4311 | /* Do this now, because execute_disk_command will do it anyway in the |
4312 | vast majority of cases. */ | |
4313 | maybe_make_export_env (); | |
4314 | ||
95732b49 JA |
4315 | /* Don't let a DEBUG trap overwrite the command string to be saved with |
4316 | the process/job associated with this child. */ | |
8868edaf CR |
4317 | fork_flags = async ? FORK_ASYNC : 0; |
4318 | if (make_child (p = savestring (the_printed_command_except_trap), fork_flags) == 0) | |
cce855bc JA |
4319 | { |
4320 | already_forked = 1; | |
8868edaf | 4321 | cmdflags |= CMD_NO_FORK; |
cce855bc | 4322 | |
a0c0a00f | 4323 | subshell_environment = SUBSHELL_FORK; /* XXX */ |
95732b49 JA |
4324 | if (pipe_in != NO_PIPE || pipe_out != NO_PIPE) |
4325 | subshell_environment |= SUBSHELL_PIPE; | |
4326 | if (async) | |
4327 | subshell_environment |= SUBSHELL_ASYNC; | |
28ef6c31 | 4328 | |
bb70624e JA |
4329 | /* We need to do this before piping to handle some really |
4330 | pathological cases where one of the pipe file descriptors | |
4331 | is < 2. */ | |
4332 | if (fds_to_close) | |
4333 | close_fd_bitmap (fds_to_close); | |
4334 | ||
a0c0a00f CR |
4335 | /* If we fork because of an input pipe, note input pipe for later to |
4336 | inhibit async commands from redirecting stdin from /dev/null */ | |
4337 | stdin_redir |= pipe_in != NO_PIPE; | |
4338 | ||
cce855bc | 4339 | do_piping (pipe_in, pipe_out); |
f73dda09 | 4340 | pipe_in = pipe_out = NO_PIPE; |
3185942a JA |
4341 | #if defined (COPROCESS_SUPPORT) |
4342 | coproc_closeall (); | |
4343 | #endif | |
cce855bc | 4344 | |
b72432fd | 4345 | last_asynchronous_pid = old_last_async_pid; |
ac50fbac | 4346 | |
a0c0a00f CR |
4347 | if (async) |
4348 | subshell_level++; /* not for pipes yet */ | |
d233b485 CR |
4349 | |
4350 | #if defined (JOB_CONTROL) | |
4351 | FREE (p); /* child doesn't use pointer */ | |
4352 | #endif | |
cce855bc JA |
4353 | } |
4354 | else | |
4355 | { | |
495aee44 CR |
4356 | /* Don't let simple commands that aren't the last command in a |
4357 | pipeline change $? for the rest of the pipeline (or at all). */ | |
4358 | if (pipe_out != NO_PIPE) | |
4359 | result = last_command_exit_value; | |
cce855bc | 4360 | close_pipes (pipe_in, pipe_out); |
cce855bc | 4361 | command_line = (char *)NULL; /* don't free this. */ |
cce855bc JA |
4362 | return (result); |
4363 | } | |
4364 | } | |
4365 | ||
a0c0a00f CR |
4366 | QUIT; /* XXX */ |
4367 | ||
726f6388 JA |
4368 | /* If we are re-running this as the result of executing the `command' |
4369 | builtin, do not expand the command words a second time. */ | |
8868edaf | 4370 | if ((cmdflags & CMD_INHIBIT_EXPANSION) == 0) |
726f6388 JA |
4371 | { |
4372 | current_fds_to_close = fds_to_close; | |
ccc6cda3 | 4373 | fix_assignment_words (simple_command->words); |
3185942a | 4374 | /* Pass the ignore return flag down to command substitutions */ |
8868edaf | 4375 | if (cmdflags & CMD_IGNORE_RETURN) /* XXX */ |
3185942a | 4376 | comsub_ignore_return++; |
726f6388 | 4377 | words = expand_words (simple_command->words); |
8868edaf | 4378 | if (cmdflags & CMD_IGNORE_RETURN) |
3185942a | 4379 | comsub_ignore_return--; |
726f6388 JA |
4380 | current_fds_to_close = (struct fd_bitmap *)NULL; |
4381 | } | |
4382 | else | |
4383 | words = copy_word_list (simple_command->words); | |
4384 | ||
726f6388 JA |
4385 | /* It is possible for WORDS not to have anything left in it. |
4386 | Perhaps all the words consisted of `$foo', and there was | |
4387 | no variable `$foo'. */ | |
ccc6cda3 | 4388 | if (words == 0) |
726f6388 | 4389 | { |
b80f6443 | 4390 | this_command_name = 0; |
ccc6cda3 | 4391 | result = execute_null_command (simple_command->redirects, |
cce855bc | 4392 | pipe_in, pipe_out, |
95732b49 | 4393 | already_forked ? 0 : async); |
cce855bc | 4394 | if (already_forked) |
a0c0a00f | 4395 | sh_exit (result); |
cce855bc JA |
4396 | else |
4397 | { | |
4398 | bind_lastarg ((char *)NULL); | |
4399 | set_pipestatus_from_exit (result); | |
4400 | return (result); | |
4401 | } | |
ccc6cda3 | 4402 | } |
726f6388 | 4403 | |
ccc6cda3 | 4404 | lastarg = (char *)NULL; |
726f6388 | 4405 | |
ccc6cda3 | 4406 | begin_unwind_frame ("simple-command"); |
726f6388 | 4407 | |
8868edaf | 4408 | if (echo_command_at_execute && (cmdflags & CMD_COMMAND_BUILTIN) == 0) |
b80f6443 | 4409 | xtrace_print_word_list (words, 1); |
726f6388 | 4410 | |
f73dda09 | 4411 | builtin = (sh_builtin_func_t *)NULL; |
ccc6cda3 | 4412 | func = (SHELL_VAR *)NULL; |
8868edaf CR |
4413 | |
4414 | /* This test is still here in case we want to change the command builtin | |
4415 | handler code below to recursively call execute_simple_command (after | |
4416 | modifying the simple_command struct). */ | |
4417 | if ((cmdflags & CMD_NO_FUNCTIONS) == 0) | |
ccc6cda3 JA |
4418 | { |
4419 | /* Posix.2 says special builtins are found before functions. We | |
4420 | don't set builtin_is_special anywhere other than here, because | |
4421 | this path is followed only when the `command' builtin is *not* | |
4422 | being used, and we don't want to exit the shell if a special | |
4423 | builtin executed with `command builtin' fails. `command' is not | |
4424 | a special builtin. */ | |
4425 | if (posixly_correct) | |
4426 | { | |
4427 | builtin = find_special_builtin (words->word->word); | |
4428 | if (builtin) | |
4429 | builtin_is_special = 1; | |
726f6388 | 4430 | } |
ccc6cda3 | 4431 | if (builtin == 0) |
726f6388 | 4432 | func = find_function (words->word->word); |
ccc6cda3 | 4433 | } |
726f6388 | 4434 | |
b80f6443 JA |
4435 | /* In POSIX mode, assignment errors in the temporary environment cause a |
4436 | non-interactive shell to exit. */ | |
8868edaf | 4437 | #if 1 |
ac50fbac | 4438 | if (posixly_correct && builtin_is_special && interactive_shell == 0 && tempenv_assign_error) |
8868edaf CR |
4439 | #else |
4440 | /* This is for strict posix conformance. */ | |
4441 | if (posixly_correct && interactive_shell == 0 && tempenv_assign_error) | |
4442 | #endif | |
b80f6443 JA |
4443 | { |
4444 | last_command_exit_value = EXECUTION_FAILURE; | |
4445 | jump_to_top_level (ERREXIT); | |
4446 | } | |
ac50fbac | 4447 | tempenv_assign_error = 0; /* don't care about this any more */ |
b80f6443 | 4448 | |
8868edaf CR |
4449 | /* This is where we handle the command builtin as a pseudo-reserved word |
4450 | prefix. This allows us to optimize away forks if we can. */ | |
4451 | old_command_builtin = -1; | |
4452 | if (builtin == 0 && func == 0) | |
4453 | { | |
4454 | WORD_LIST *disposer, *l; | |
4455 | int cmdtype; | |
4456 | ||
4457 | builtin = find_shell_builtin (words->word->word); | |
4458 | while (builtin == command_builtin) | |
4459 | { | |
4460 | disposer = words; | |
4461 | cmdtype = 0; | |
4462 | words = check_command_builtin (words, &cmdtype); | |
4463 | if (cmdtype > 0) /* command -p [--] words */ | |
4464 | { | |
4465 | for (l = disposer; l->next != words; l = l->next) | |
4466 | ; | |
4467 | l->next = 0; | |
4468 | dispose_words (disposer); | |
4469 | cmdflags |= CMD_COMMAND_BUILTIN | CMD_NO_FUNCTIONS; | |
4470 | if (cmdtype == 2) | |
4471 | cmdflags |= CMD_STDPATH; | |
4472 | builtin = find_shell_builtin (words->word->word); | |
4473 | } | |
4474 | else | |
4475 | break; | |
4476 | } | |
4477 | if (cmdflags & CMD_COMMAND_BUILTIN) | |
4478 | { | |
4479 | old_command_builtin = executing_command_builtin; | |
4480 | unwind_protect_int (executing_command_builtin); | |
4481 | executing_command_builtin |= 1; | |
4482 | } | |
4483 | builtin = 0; | |
4484 | } | |
4485 | ||
ccc6cda3 JA |
4486 | add_unwind_protect (dispose_words, words); |
4487 | QUIT; | |
726f6388 | 4488 | |
ccc6cda3 JA |
4489 | /* Bind the last word in this command to "$_" after execution. */ |
4490 | for (lastword = words; lastword->next; lastword = lastword->next) | |
4491 | ; | |
4492 | lastarg = lastword->word->word; | |
726f6388 JA |
4493 | |
4494 | #if defined (JOB_CONTROL) | |
ccc6cda3 | 4495 | /* Is this command a job control related thing? */ |
cce855bc | 4496 | if (words->word->word[0] == '%' && already_forked == 0) |
ccc6cda3 JA |
4497 | { |
4498 | this_command_name = async ? "bg" : "fg"; | |
726f6388 | 4499 | last_shell_builtin = this_shell_builtin; |
ccc6cda3 JA |
4500 | this_shell_builtin = builtin_address (this_command_name); |
4501 | result = (*this_shell_builtin) (words); | |
4502 | goto return_result; | |
4503 | } | |
726f6388 | 4504 | |
ac50fbac | 4505 | /* One other possibililty. The user may want to resume an existing job. |
ccc6cda3 JA |
4506 | If they do, find out whether this word is a candidate for a running |
4507 | job. */ | |
cce855bc | 4508 | if (job_control && already_forked == 0 && async == 0 && |
ccc6cda3 JA |
4509 | !first_word_quoted && |
4510 | !words->next && | |
4511 | words->word->word[0] && | |
4512 | !simple_command->redirects && | |
4513 | pipe_in == NO_PIPE && | |
4514 | pipe_out == NO_PIPE && | |
4515 | (temp = get_string_value ("auto_resume"))) | |
4516 | { | |
7117c2d2 | 4517 | int job, jflags, started_status; |
ccc6cda3 | 4518 | |
7117c2d2 JA |
4519 | jflags = JM_STOPPED|JM_FIRSTMATCH; |
4520 | if (STREQ (temp, "exact")) | |
4521 | jflags |= JM_EXACT; | |
4522 | else if (STREQ (temp, "substring")) | |
4523 | jflags |= JM_SUBSTRING; | |
4524 | else | |
4525 | jflags |= JM_PREFIX; | |
4526 | job = get_job_by_name (words->word->word, jflags); | |
4527 | if (job != NO_JOB) | |
726f6388 | 4528 | { |
7117c2d2 JA |
4529 | run_unwind_frame ("simple-command"); |
4530 | this_command_name = "fg"; | |
4531 | last_shell_builtin = this_shell_builtin; | |
4532 | this_shell_builtin = builtin_address ("fg"); | |
ccc6cda3 | 4533 | |
7117c2d2 JA |
4534 | started_status = start_job (job, 1); |
4535 | return ((started_status < 0) ? EXECUTION_FAILURE : started_status); | |
726f6388 | 4536 | } |
ccc6cda3 JA |
4537 | } |
4538 | #endif /* JOB_CONTROL */ | |
726f6388 | 4539 | |
3185942a | 4540 | run_builtin: |
ccc6cda3 JA |
4541 | /* Remember the name of this command globally. */ |
4542 | this_command_name = words->word->word; | |
726f6388 | 4543 | |
ccc6cda3 JA |
4544 | QUIT; |
4545 | ||
4546 | /* This command could be a shell builtin or a user-defined function. | |
4547 | We have already found special builtins by this time, so we do not | |
4548 | set builtin_is_special. If this is a function or builtin, and we | |
4549 | have pipes, then fork a subshell in here. Otherwise, just execute | |
4550 | the command directly. */ | |
4551 | if (func == 0 && builtin == 0) | |
4552 | builtin = find_shell_builtin (this_command_name); | |
4553 | ||
4554 | last_shell_builtin = this_shell_builtin; | |
4555 | this_shell_builtin = builtin; | |
4556 | ||
4557 | if (builtin || func) | |
726f6388 | 4558 | { |
3185942a | 4559 | if (builtin) |
495aee44 CR |
4560 | { |
4561 | old_builtin = executing_builtin; | |
495aee44 | 4562 | unwind_protect_int (executing_builtin); /* modified in execute_builtin */ |
8868edaf CR |
4563 | if (old_command_builtin == -1) /* sentinel, can be set above */ |
4564 | { | |
4565 | old_command_builtin = executing_command_builtin; | |
4566 | unwind_protect_int (executing_command_builtin); /* ditto and set above */ | |
4567 | } | |
495aee44 | 4568 | } |
28ef6c31 | 4569 | if (already_forked) |
726f6388 | 4570 | { |
cce855bc | 4571 | /* reset_terminating_signals (); */ /* XXX */ |
495aee44 CR |
4572 | /* Reset the signal handlers in the child, but don't free the |
4573 | trap strings. Set a flag noting that we have to free the | |
4574 | trap strings if we run trap to change a signal disposition. */ | |
4575 | reset_signal_handlers (); | |
4576 | subshell_environment |= SUBSHELL_RESETTRAP; | |
726f6388 | 4577 | |
cce855bc | 4578 | if (async) |
ccc6cda3 | 4579 | { |
8868edaf | 4580 | if ((cmdflags & CMD_STDIN_REDIR) && |
cce855bc JA |
4581 | pipe_in == NO_PIPE && |
4582 | (stdin_redirects (simple_command->redirects) == 0)) | |
4583 | async_redirect_stdin (); | |
4584 | setup_async_signals (); | |
ccc6cda3 | 4585 | } |
cce855bc | 4586 | |
a0c0a00f CR |
4587 | if (async == 0) |
4588 | subshell_level++; | |
cce855bc JA |
4589 | execute_subshell_builtin_or_function |
4590 | (words, simple_command->redirects, builtin, func, | |
4591 | pipe_in, pipe_out, async, fds_to_close, | |
8868edaf | 4592 | cmdflags); |
b80f6443 | 4593 | subshell_level--; |
726f6388 JA |
4594 | } |
4595 | else | |
4596 | { | |
ccc6cda3 JA |
4597 | result = execute_builtin_or_function |
4598 | (words, builtin, func, simple_command->redirects, fds_to_close, | |
8868edaf | 4599 | cmdflags); |
ccc6cda3 JA |
4600 | if (builtin) |
4601 | { | |
4602 | if (result > EX_SHERRBASE) | |
4603 | { | |
ac50fbac CR |
4604 | switch (result) |
4605 | { | |
4606 | case EX_REDIRFAIL: | |
4607 | case EX_BADASSIGN: | |
4608 | case EX_EXPFAIL: | |
4609 | /* These errors cause non-interactive posix mode shells to exit */ | |
4610 | if (posixly_correct && builtin_is_special && interactive_shell == 0) | |
4611 | { | |
4612 | last_command_exit_value = EXECUTION_FAILURE; | |
4613 | jump_to_top_level (ERREXIT); | |
4614 | } | |
d233b485 CR |
4615 | break; |
4616 | case EX_DISKFALLBACK: | |
4617 | /* XXX - experimental */ | |
4618 | executing_builtin = old_builtin; | |
4619 | executing_command_builtin = old_command_builtin; | |
4620 | builtin = 0; | |
4621 | /* XXX - redirections will have to be performed again */ | |
4622 | goto execute_from_filesystem; | |
ac50fbac | 4623 | } |
cce855bc JA |
4624 | result = builtin_status (result); |
4625 | if (builtin_is_special) | |
d233b485 | 4626 | special_builtin_failed = 1; /* XXX - take command builtin into account? */ |
ccc6cda3 JA |
4627 | } |
4628 | /* In POSIX mode, if there are assignment statements preceding | |
4629 | a special builtin, they persist after the builtin | |
4630 | completes. */ | |
4631 | if (posixly_correct && builtin_is_special && temporary_env) | |
4632 | merge_temporary_env (); | |
4633 | } | |
4634 | else /* function */ | |
4635 | { | |
4636 | if (result == EX_USAGE) | |
4637 | result = EX_BADUSAGE; | |
4638 | else if (result > EX_SHERRBASE) | |
8868edaf | 4639 | result = builtin_status (result); |
ccc6cda3 JA |
4640 | } |
4641 | ||
cce855bc JA |
4642 | set_pipestatus_from_exit (result); |
4643 | ||
726f6388 JA |
4644 | goto return_result; |
4645 | } | |
4646 | } | |
726f6388 | 4647 | |
3185942a JA |
4648 | if (autocd && interactive && words->word && is_dirname (words->word->word)) |
4649 | { | |
a0c0a00f | 4650 | words = make_word_list (make_word ("--"), words); |
3185942a JA |
4651 | words = make_word_list (make_word ("cd"), words); |
4652 | xtrace_print_word_list (words, 0); | |
a0c0a00f | 4653 | func = find_function ("cd"); |
3185942a JA |
4654 | goto run_builtin; |
4655 | } | |
4656 | ||
d233b485 | 4657 | execute_from_filesystem: |
cce855bc | 4658 | if (command_line == 0) |
ac50fbac | 4659 | command_line = savestring (the_printed_command_except_trap ? the_printed_command_except_trap : ""); |
cce855bc | 4660 | |
f1be666c | 4661 | #if defined (PROCESS_SUBSTITUTION) |
a0c0a00f CR |
4662 | /* The old code did not test already_forked and only did this if |
4663 | subshell_environment&SUBSHELL_COMSUB != 0 (comsubs and procsubs). Other | |
4664 | uses of the no-fork optimization left FIFOs in $TMPDIR */ | |
8868edaf CR |
4665 | if (already_forked == 0 && (cmdflags & CMD_NO_FORK) && fifos_pending() > 0) |
4666 | cmdflags &= ~CMD_NO_FORK; | |
f1be666c | 4667 | #endif |
495aee44 | 4668 | result = execute_disk_command (words, simple_command->redirects, command_line, |
ccc6cda3 | 4669 | pipe_in, pipe_out, async, fds_to_close, |
8868edaf | 4670 | cmdflags); |
726f6388 JA |
4671 | |
4672 | return_result: | |
4673 | bind_lastarg (lastarg); | |
ccc6cda3 | 4674 | FREE (command_line); |
b80f6443 | 4675 | dispose_words (words); |
495aee44 CR |
4676 | if (builtin) |
4677 | { | |
4678 | executing_builtin = old_builtin; | |
4679 | executing_command_builtin = old_command_builtin; | |
4680 | } | |
b80f6443 JA |
4681 | discard_unwind_frame ("simple-command"); |
4682 | this_command_name = (char *)NULL; /* points to freed memory now */ | |
726f6388 JA |
4683 | return (result); |
4684 | } | |
4685 | ||
ccc6cda3 JA |
4686 | /* Translate the special builtin exit statuses. We don't really need a |
4687 | function for this; it's a placeholder for future work. */ | |
4688 | static int | |
4689 | builtin_status (result) | |
4690 | int result; | |
4691 | { | |
4692 | int r; | |
4693 | ||
4694 | switch (result) | |
4695 | { | |
4696 | case EX_USAGE: | |
8868edaf | 4697 | case EX_BADSYNTAX: |
ccc6cda3 JA |
4698 | r = EX_BADUSAGE; |
4699 | break; | |
4700 | case EX_REDIRFAIL: | |
ccc6cda3 JA |
4701 | case EX_BADASSIGN: |
4702 | case EX_EXPFAIL: | |
4703 | r = EXECUTION_FAILURE; | |
4704 | break; | |
4705 | default: | |
8868edaf CR |
4706 | /* other special exit statuses not yet defined */ |
4707 | r = (result > EX_SHERRBASE) ? EXECUTION_FAILURE : EXECUTION_SUCCESS; | |
ccc6cda3 JA |
4708 | break; |
4709 | } | |
4710 | return (r); | |
4711 | } | |
4712 | ||
726f6388 JA |
4713 | static int |
4714 | execute_builtin (builtin, words, flags, subshell) | |
f73dda09 | 4715 | sh_builtin_func_t *builtin; |
726f6388 JA |
4716 | WORD_LIST *words; |
4717 | int flags, subshell; | |
4718 | { | |
d233b485 CR |
4719 | int result, eval_unwind, ignexit_flag; |
4720 | int isbltinenv, should_keep; | |
0001803f | 4721 | char *error_trap; |
726f6388 | 4722 | |
0001803f | 4723 | error_trap = 0; |
d233b485 | 4724 | should_keep = 0; |
a0c0a00f | 4725 | |
726f6388 JA |
4726 | /* The eval builtin calls parse_and_execute, which does not know about |
4727 | the setting of flags, and always calls the execution functions with | |
4728 | flags that will exit the shell on an error if -e is set. If the | |
4729 | eval builtin is being called, and we're supposed to ignore the exit | |
0001803f CR |
4730 | value of the command, we turn the -e flag off ourselves and disable |
4731 | the ERR trap, then restore them when the command completes. This is | |
4732 | also a problem (as below) for the command and source/. builtins. */ | |
3185942a | 4733 | if (subshell == 0 && (flags & CMD_IGNORE_RETURN) && |
8868edaf | 4734 | (builtin == eval_builtin || (flags & CMD_COMMAND_BUILTIN) || builtin == source_builtin)) |
726f6388 JA |
4735 | { |
4736 | begin_unwind_frame ("eval_builtin"); | |
4737 | unwind_protect_int (exit_immediately_on_error); | |
ac50fbac | 4738 | unwind_protect_int (builtin_ignoring_errexit); |
0001803f CR |
4739 | error_trap = TRAP_STRING (ERROR_TRAP); |
4740 | if (error_trap) | |
4741 | { | |
4742 | error_trap = savestring (error_trap); | |
4743 | add_unwind_protect (xfree, error_trap); | |
4744 | add_unwind_protect (set_error_trap, error_trap); | |
4745 | restore_default_signal (ERROR_TRAP); | |
4746 | } | |
726f6388 | 4747 | exit_immediately_on_error = 0; |
a0c0a00f | 4748 | ignexit_flag = builtin_ignoring_errexit; |
ac50fbac | 4749 | builtin_ignoring_errexit = 1; |
d166f048 | 4750 | eval_unwind = 1; |
726f6388 | 4751 | } |
d166f048 JA |
4752 | else |
4753 | eval_unwind = 0; | |
726f6388 JA |
4754 | |
4755 | /* The temporary environment for a builtin is supposed to apply to | |
4756 | all commands executed by that builtin. Currently, this is a | |
ac50fbac CR |
4757 | problem only with the `unset', `source' and `eval' builtins. |
4758 | `mapfile' is a special case because it uses evalstring (same as | |
4759 | eval or source) to run its callbacks. */ | |
d233b485 CR |
4760 | /* SHOULD_KEEP is for the pop_scope call below; it only matters when |
4761 | posixly_correct is set, but we should propagate the temporary environment | |
4762 | to the enclosing environment only for special builtins. */ | |
ac50fbac | 4763 | isbltinenv = (builtin == source_builtin || builtin == eval_builtin || builtin == unset_builtin || builtin == mapfile_builtin); |
d233b485 CR |
4764 | should_keep = isbltinenv && builtin != mapfile_builtin; |
4765 | #if defined (HISTORY) && defined (READLINE) | |
4766 | if (builtin == fc_builtin || builtin == read_builtin) | |
4767 | { | |
4768 | isbltinenv = 1; | |
4769 | should_keep = 0; | |
4770 | } | |
4771 | #endif | |
95732b49 | 4772 | |
7117c2d2 | 4773 | if (isbltinenv) |
726f6388 JA |
4774 | { |
4775 | if (subshell == 0) | |
4776 | begin_unwind_frame ("builtin_env"); | |
4777 | ||
4778 | if (temporary_env) | |
4779 | { | |
7117c2d2 | 4780 | push_scope (VC_BLTNENV, temporary_env); |
d233b485 CR |
4781 | if (flags & CMD_COMMAND_BUILTIN) |
4782 | should_keep = 0; | |
726f6388 | 4783 | if (subshell == 0) |
d233b485 | 4784 | add_unwind_protect (pop_scope, should_keep ? "1" : 0); |
7117c2d2 | 4785 | temporary_env = (HASH_TABLE *)NULL; |
726f6388 | 4786 | } |
28ef6c31 JA |
4787 | } |
4788 | ||
a0c0a00f CR |
4789 | if (subshell == 0 && builtin == eval_builtin) |
4790 | { | |
4791 | if (evalnest_max > 0 && evalnest >= evalnest_max) | |
4792 | { | |
4793 | internal_error (_("eval: maximum eval nesting level exceeded (%d)"), evalnest); | |
4794 | evalnest = 0; | |
4795 | jump_to_top_level (DISCARD); | |
4796 | } | |
4797 | unwind_protect_int (evalnest); | |
4798 | /* The test for subshell == 0 above doesn't make a difference */ | |
4799 | evalnest++; /* execute_subshell_builtin_or_function sets this to 0 */ | |
4800 | } | |
4801 | else if (subshell == 0 && builtin == source_builtin) | |
4802 | { | |
4803 | if (sourcenest_max > 0 && sourcenest >= sourcenest_max) | |
4804 | { | |
4805 | internal_error (_("%s: maximum source nesting level exceeded (%d)"), this_command_name, sourcenest); | |
4806 | sourcenest = 0; | |
4807 | jump_to_top_level (DISCARD); | |
4808 | } | |
4809 | unwind_protect_int (sourcenest); | |
4810 | /* The test for subshell == 0 above doesn't make a difference */ | |
4811 | sourcenest++; /* execute_subshell_builtin_or_function sets this to 0 */ | |
4812 | } | |
4813 | ||
28ef6c31 JA |
4814 | /* `return' does a longjmp() back to a saved environment in execute_function. |
4815 | If a variable assignment list preceded the command, and the shell is | |
4816 | running in POSIX mode, we need to merge that into the shell_variables | |
d233b485 CR |
4817 | table, since `return' is a POSIX special builtin. We don't do this if |
4818 | it's being run by the `command' builtin, since that's supposed to inhibit | |
4819 | the special builtin properties. */ | |
4820 | if (posixly_correct && subshell == 0 && builtin == return_builtin && (flags & CMD_COMMAND_BUILTIN) == 0 && temporary_env) | |
28ef6c31 JA |
4821 | { |
4822 | begin_unwind_frame ("return_temp_env"); | |
4823 | add_unwind_protect (merge_temporary_env, (char *)NULL); | |
726f6388 JA |
4824 | } |
4825 | ||
3185942a | 4826 | executing_builtin++; |
495aee44 | 4827 | executing_command_builtin |= builtin == command_builtin; |
726f6388 JA |
4828 | result = ((*builtin) (words->next)); |
4829 | ||
28ef6c31 JA |
4830 | /* This shouldn't happen, but in case `return' comes back instead of |
4831 | longjmp'ing, we need to unwind. */ | |
4832 | if (posixly_correct && subshell == 0 && builtin == return_builtin && temporary_env) | |
4833 | discard_unwind_frame ("return_temp_env"); | |
4834 | ||
7117c2d2 JA |
4835 | if (subshell == 0 && isbltinenv) |
4836 | run_unwind_frame ("builtin_env"); | |
726f6388 | 4837 | |
d166f048 | 4838 | if (eval_unwind) |
726f6388 | 4839 | { |
a0c0a00f CR |
4840 | builtin_ignoring_errexit = ignexit_flag; |
4841 | exit_immediately_on_error = builtin_ignoring_errexit ? 0 : errexit_flag; | |
0001803f CR |
4842 | if (error_trap) |
4843 | { | |
4844 | set_error_trap (error_trap); | |
d233b485 | 4845 | free (error_trap); |
0001803f | 4846 | } |
726f6388 JA |
4847 | discard_unwind_frame ("eval_builtin"); |
4848 | } | |
4849 | ||
4850 | return (result); | |
4851 | } | |
4852 | ||
a0c0a00f CR |
4853 | static void |
4854 | maybe_restore_getopt_state (gs) | |
4855 | sh_getopt_state_t *gs; | |
4856 | { | |
a0c0a00f CR |
4857 | /* If we have a local copy of OPTIND and it's at the right (current) |
4858 | context, then we restore getopt's internal state. If not, we just | |
4859 | let it go. We know there is a local OPTIND if gs->gs_flags & 1. | |
4860 | This is set below in execute_function() before the context is run. */ | |
4861 | if (gs->gs_flags & 1) | |
4862 | sh_getopt_restore_istate (gs); | |
4863 | else | |
4864 | free (gs); | |
4865 | } | |
4866 | ||
4867 | #if defined (ARRAY_VARS) | |
4868 | void | |
4869 | restore_funcarray_state (fa) | |
4870 | struct func_array_state *fa; | |
4871 | { | |
4872 | SHELL_VAR *nfv; | |
4873 | ARRAY *funcname_a; | |
4874 | ||
4875 | array_pop (fa->source_a); | |
4876 | array_pop (fa->lineno_a); | |
4877 | ||
4878 | GET_ARRAY_FROM_VAR ("FUNCNAME", nfv, funcname_a); | |
4879 | if (nfv == fa->funcname_v) | |
4880 | array_pop (funcname_a); | |
4881 | ||
4882 | free (fa); | |
4883 | } | |
4884 | #endif | |
4885 | ||
726f6388 JA |
4886 | static int |
4887 | execute_function (var, words, flags, fds_to_close, async, subshell) | |
4888 | SHELL_VAR *var; | |
4889 | WORD_LIST *words; | |
f73dda09 | 4890 | int flags; |
726f6388 | 4891 | struct fd_bitmap *fds_to_close; |
f73dda09 | 4892 | int async, subshell; |
726f6388 JA |
4893 | { |
4894 | int return_val, result; | |
b80f6443 JA |
4895 | COMMAND *tc, *fc, *save_current; |
4896 | char *debug_trap, *error_trap, *return_trap; | |
4897 | #if defined (ARRAY_VARS) | |
a0c0a00f | 4898 | SHELL_VAR *funcname_v, *bash_source_v, *bash_lineno_v; |
495aee44 CR |
4899 | ARRAY *funcname_a; |
4900 | volatile ARRAY *bash_source_a; | |
4901 | volatile ARRAY *bash_lineno_a; | |
a0c0a00f | 4902 | struct func_array_state *fa; |
b80f6443 JA |
4903 | #endif |
4904 | FUNCTION_DEF *shell_fn; | |
4905 | char *sfile, *t; | |
a0c0a00f CR |
4906 | sh_getopt_state_t *gs; |
4907 | SHELL_VAR *gv; | |
f73dda09 JA |
4908 | |
4909 | USE_VAR(fc); | |
726f6388 | 4910 | |
0001803f CR |
4911 | if (funcnest_max > 0 && funcnest >= funcnest_max) |
4912 | { | |
ac50fbac | 4913 | internal_error (_("%s: maximum function nesting level exceeded (%d)"), var->name, funcnest); |
495aee44 | 4914 | funcnest = 0; /* XXX - should we reset it somewhere else? */ |
0001803f CR |
4915 | jump_to_top_level (DISCARD); |
4916 | } | |
0001803f | 4917 | |
b80f6443 JA |
4918 | #if defined (ARRAY_VARS) |
4919 | GET_ARRAY_FROM_VAR ("FUNCNAME", funcname_v, funcname_a); | |
4920 | GET_ARRAY_FROM_VAR ("BASH_SOURCE", bash_source_v, bash_source_a); | |
4921 | GET_ARRAY_FROM_VAR ("BASH_LINENO", bash_lineno_v, bash_lineno_a); | |
4922 | #endif | |
4923 | ||
726f6388 JA |
4924 | tc = (COMMAND *)copy_command (function_cell (var)); |
4925 | if (tc && (flags & CMD_IGNORE_RETURN)) | |
4926 | tc->flags |= CMD_IGNORE_RETURN; | |
4927 | ||
8868edaf CR |
4928 | /* A limited attempt at optimization: shell functions at the end of command |
4929 | substitutions that are already marked NO_FORK. */ | |
4930 | if (tc && (flags & CMD_NO_FORK) && (subshell_environment & SUBSHELL_COMSUB)) | |
4931 | optimize_shell_function (tc); | |
4932 | ||
a0c0a00f | 4933 | gs = sh_getopt_save_istate (); |
726f6388 JA |
4934 | if (subshell == 0) |
4935 | { | |
ccc6cda3 | 4936 | begin_unwind_frame ("function_calling"); |
d233b485 CR |
4937 | /* If the shell is in posix mode, this will push the variables in |
4938 | the temporary environment to the "current shell environment" (the | |
4939 | global scope), and dispose the temporary env before setting it to | |
4940 | NULL later. This behavior has disappeared from the latest edition | |
4941 | of the standard, so I will eventually remove it from variables.c: | |
4942 | push_var_context. */ | |
7117c2d2 | 4943 | push_context (var->name, subshell, temporary_env); |
a0c0a00f CR |
4944 | /* This has to be before the pop_context(), because the unwinding of |
4945 | local variables may cause the restore of a local declaration of | |
4946 | OPTIND to force a getopts state reset. */ | |
4947 | add_unwind_protect (maybe_restore_getopt_state, gs); | |
726f6388 JA |
4948 | add_unwind_protect (pop_context, (char *)NULL); |
4949 | unwind_protect_int (line_number); | |
a0c0a00f CR |
4950 | unwind_protect_int (line_number_for_err_trap); |
4951 | unwind_protect_int (function_line_number); | |
ccc6cda3 JA |
4952 | unwind_protect_int (return_catch_flag); |
4953 | unwind_protect_jmp_buf (return_catch); | |
4954 | add_unwind_protect (dispose_command, (char *)tc); | |
bb70624e | 4955 | unwind_protect_pointer (this_shell_function); |
0001803f | 4956 | unwind_protect_int (funcnest); |
a0c0a00f | 4957 | unwind_protect_int (loop_level); |
726f6388 | 4958 | } |
7117c2d2 JA |
4959 | else |
4960 | push_context (var->name, subshell, temporary_env); /* don't unwind-protect for subshells */ | |
4961 | ||
4962 | temporary_env = (HASH_TABLE *)NULL; | |
726f6388 | 4963 | |
bb70624e JA |
4964 | this_shell_function = var; |
4965 | make_funcname_visible (1); | |
4966 | ||
f73dda09 JA |
4967 | debug_trap = TRAP_STRING(DEBUG_TRAP); |
4968 | error_trap = TRAP_STRING(ERROR_TRAP); | |
b80f6443 | 4969 | return_trap = TRAP_STRING(RETURN_TRAP); |
f73dda09 | 4970 | |
b80f6443 JA |
4971 | /* The order of the unwind protects for debug_trap, error_trap and |
4972 | return_trap is important here! unwind-protect commands are run | |
4973 | in reverse order of registration. If this causes problems, take | |
4974 | out the xfree unwind-protect calls and live with the small memory leak. */ | |
4975 | ||
4976 | /* function_trace_mode != 0 means that all functions inherit the DEBUG trap. | |
4977 | if the function has the trace attribute set, it inherits the DEBUG trap */ | |
4978 | if (debug_trap && ((trace_p (var) == 0) && function_trace_mode == 0)) | |
ccc6cda3 JA |
4979 | { |
4980 | if (subshell == 0) | |
4981 | { | |
4982 | debug_trap = savestring (debug_trap); | |
cce855bc | 4983 | add_unwind_protect (xfree, debug_trap); |
a0c0a00f | 4984 | add_unwind_protect (maybe_set_debug_trap, debug_trap); |
ccc6cda3 JA |
4985 | } |
4986 | restore_default_signal (DEBUG_TRAP); | |
4987 | } | |
726f6388 | 4988 | |
b80f6443 JA |
4989 | /* error_trace_mode != 0 means that functions inherit the ERR trap. */ |
4990 | if (error_trap && error_trace_mode == 0) | |
f73dda09 JA |
4991 | { |
4992 | if (subshell == 0) | |
4993 | { | |
4994 | error_trap = savestring (error_trap); | |
4995 | add_unwind_protect (xfree, error_trap); | |
a0c0a00f | 4996 | add_unwind_protect (maybe_set_error_trap, error_trap); |
f73dda09 JA |
4997 | } |
4998 | restore_default_signal (ERROR_TRAP); | |
4999 | } | |
5000 | ||
95732b49 JA |
5001 | /* Shell functions inherit the RETURN trap if function tracing is on |
5002 | globally or on individually for this function. */ | |
95732b49 | 5003 | if (return_trap && (signal_in_progress (DEBUG_TRAP) || ((trace_p (var) == 0) && function_trace_mode == 0))) |
b80f6443 JA |
5004 | { |
5005 | if (subshell == 0) | |
5006 | { | |
5007 | return_trap = savestring (return_trap); | |
5008 | add_unwind_protect (xfree, return_trap); | |
a0c0a00f | 5009 | add_unwind_protect (maybe_set_return_trap, return_trap); |
b80f6443 JA |
5010 | } |
5011 | restore_default_signal (RETURN_TRAP); | |
5012 | } | |
5013 | ||
5014 | funcnest++; | |
5015 | #if defined (ARRAY_VARS) | |
5016 | /* This is quite similar to the code in shell.c and elsewhere. */ | |
5017 | shell_fn = find_function_def (this_shell_function->name); | |
5018 | sfile = shell_fn ? shell_fn->source_file : ""; | |
ac50fbac | 5019 | array_push ((ARRAY *)funcname_a, this_shell_function->name); |
b80f6443 | 5020 | |
ac50fbac | 5021 | array_push ((ARRAY *)bash_source_a, sfile); |
b80f6443 | 5022 | t = itos (executing_line_number ()); |
ac50fbac | 5023 | array_push ((ARRAY *)bash_lineno_a, t); |
b80f6443 JA |
5024 | free (t); |
5025 | #endif | |
5026 | ||
a0c0a00f CR |
5027 | #if defined (ARRAY_VARS) |
5028 | fa = (struct func_array_state *)xmalloc (sizeof (struct func_array_state)); | |
5029 | fa->source_a = (ARRAY *)bash_source_a; | |
5030 | fa->source_v = bash_source_v; | |
5031 | fa->lineno_a = (ARRAY *)bash_lineno_a; | |
5032 | fa->lineno_v = bash_lineno_v; | |
5033 | fa->funcname_a = (ARRAY *)funcname_a; | |
5034 | fa->funcname_v = funcname_v; | |
5035 | if (subshell == 0) | |
5036 | add_unwind_protect (restore_funcarray_state, fa); | |
5037 | #endif | |
5038 | ||
726f6388 JA |
5039 | /* The temporary environment for a function is supposed to apply to |
5040 | all commands executed within the function body. */ | |
726f6388 | 5041 | |
d233b485 CR |
5042 | /* Initialize BASH_ARGC and BASH_ARGV before we blow away the positional |
5043 | parameters */ | |
5044 | if (debugging_mode || shell_compatibility_level <= 44) | |
5045 | init_bash_argv (); | |
5046 | ||
726f6388 JA |
5047 | remember_args (words->next, 1); |
5048 | ||
b80f6443 JA |
5049 | /* Update BASH_ARGV and BASH_ARGC */ |
5050 | if (debugging_mode) | |
a0c0a00f CR |
5051 | { |
5052 | push_args (words->next); | |
5053 | if (subshell == 0) | |
5054 | add_unwind_protect (pop_args, 0); | |
5055 | } | |
b80f6443 | 5056 | |
ccc6cda3 | 5057 | /* Number of the line on which the function body starts. */ |
b80f6443 | 5058 | line_number = function_line_number = tc->line; |
726f6388 | 5059 | |
726f6388 | 5060 | #if defined (JOB_CONTROL) |
95732b49 JA |
5061 | if (subshell) |
5062 | stop_pipeline (async, (COMMAND *)NULL); | |
726f6388 | 5063 | #endif |
726f6388 | 5064 | |
a0c0a00f CR |
5065 | if (shell_compatibility_level > 43) |
5066 | loop_level = 0; | |
5067 | ||
95732b49 | 5068 | fc = tc; |
726f6388 | 5069 | |
a0c0a00f CR |
5070 | from_return_trap = 0; |
5071 | ||
726f6388 | 5072 | return_catch_flag++; |
ac50fbac | 5073 | return_val = setjmp_nosigs (return_catch); |
726f6388 JA |
5074 | |
5075 | if (return_val) | |
95732b49 JA |
5076 | { |
5077 | result = return_catch_value; | |
5078 | /* Run the RETURN trap in the function's context. */ | |
5079 | save_current = currently_executing_command; | |
a0c0a00f CR |
5080 | if (from_return_trap == 0) |
5081 | run_return_trap (); | |
95732b49 JA |
5082 | currently_executing_command = save_current; |
5083 | } | |
726f6388 | 5084 | else |
b80f6443 JA |
5085 | { |
5086 | /* Run the debug trap here so we can trap at the start of a function's | |
5087 | execution rather than the execution of the body's first command. */ | |
5088 | showing_function_line = 1; | |
5089 | save_current = currently_executing_command; | |
5090 | result = run_debug_trap (); | |
5091 | #if defined (DEBUGGER) | |
5092 | /* In debugging mode, if the DEBUG trap returns a non-zero status, we | |
5093 | skip the command. */ | |
5094 | if (debugging_mode == 0 || result == EXECUTION_SUCCESS) | |
5095 | { | |
5096 | showing_function_line = 0; | |
5097 | currently_executing_command = save_current; | |
5098 | result = execute_command_internal (fc, 0, NO_PIPE, NO_PIPE, fds_to_close); | |
5099 | ||
5100 | /* Run the RETURN trap in the function's context */ | |
5101 | save_current = currently_executing_command; | |
5102 | run_return_trap (); | |
5103 | currently_executing_command = save_current; | |
5104 | } | |
5105 | #else | |
5106 | result = execute_command_internal (fc, 0, NO_PIPE, NO_PIPE, fds_to_close); | |
95732b49 JA |
5107 | |
5108 | save_current = currently_executing_command; | |
5109 | run_return_trap (); | |
5110 | currently_executing_command = save_current; | |
b80f6443 JA |
5111 | #endif |
5112 | showing_function_line = 0; | |
5113 | } | |
5114 | ||
a0c0a00f CR |
5115 | /* If we have a local copy of OPTIND, note it in the saved getopts state. */ |
5116 | gv = find_variable ("OPTIND"); | |
5117 | if (gv && gv->context == variable_context) | |
5118 | gs->gs_flags |= 1; | |
726f6388 | 5119 | |
ccc6cda3 | 5120 | if (subshell == 0) |
726f6388 | 5121 | run_unwind_frame ("function_calling"); |
b80f6443 | 5122 | #if defined (ARRAY_VARS) |
a0c0a00f CR |
5123 | else |
5124 | { | |
5125 | restore_funcarray_state (fa); | |
5126 | /* Restore BASH_ARGC and BASH_ARGV */ | |
5127 | if (debugging_mode) | |
5128 | pop_args (); | |
5129 | } | |
b80f6443 | 5130 | #endif |
a0c0a00f | 5131 | |
bb70624e | 5132 | if (variable_context == 0 || this_shell_function == 0) |
0001803f CR |
5133 | { |
5134 | make_funcname_visible (0); | |
5135 | #if defined (PROCESS_SUBSTITUTION) | |
5136 | unlink_fifo_list (); | |
5137 | #endif | |
5138 | } | |
a0c0a00f | 5139 | |
726f6388 JA |
5140 | return (result); |
5141 | } | |
5142 | ||
bb70624e JA |
5143 | /* A convenience routine for use by other parts of the shell to execute |
5144 | a particular shell function. */ | |
5145 | int | |
5146 | execute_shell_function (var, words) | |
5147 | SHELL_VAR *var; | |
5148 | WORD_LIST *words; | |
5149 | { | |
5150 | int ret; | |
5151 | struct fd_bitmap *bitmap; | |
5152 | ||
5153 | bitmap = new_fd_bitmap (FD_BITMAP_DEFAULT_SIZE); | |
5154 | begin_unwind_frame ("execute-shell-function"); | |
5155 | add_unwind_protect (dispose_fd_bitmap, (char *)bitmap); | |
5156 | ||
5157 | ret = execute_function (var, words, 0, bitmap, 0, 0); | |
5158 | ||
5159 | dispose_fd_bitmap (bitmap); | |
5160 | discard_unwind_frame ("execute-shell-function"); | |
5161 | ||
5162 | return ret; | |
5163 | } | |
5164 | ||
726f6388 JA |
5165 | /* Execute a shell builtin or function in a subshell environment. This |
5166 | routine does not return; it only calls exit(). If BUILTIN is non-null, | |
5167 | it points to a function to call to execute a shell builtin; otherwise | |
5168 | VAR points at the body of a function to execute. WORDS is the arguments | |
5169 | to the command, REDIRECTS specifies redirections to perform before the | |
5170 | command is executed. */ | |
5171 | static void | |
5172 | execute_subshell_builtin_or_function (words, redirects, builtin, var, | |
5173 | pipe_in, pipe_out, async, fds_to_close, | |
5174 | flags) | |
5175 | WORD_LIST *words; | |
5176 | REDIRECT *redirects; | |
f73dda09 | 5177 | sh_builtin_func_t *builtin; |
726f6388 JA |
5178 | SHELL_VAR *var; |
5179 | int pipe_in, pipe_out, async; | |
5180 | struct fd_bitmap *fds_to_close; | |
5181 | int flags; | |
5182 | { | |
0628567a | 5183 | int result, r, funcvalue; |
bb70624e JA |
5184 | #if defined (JOB_CONTROL) |
5185 | int jobs_hack; | |
726f6388 | 5186 | |
b72432fd JA |
5187 | jobs_hack = (builtin == jobs_builtin) && |
5188 | ((subshell_environment & SUBSHELL_ASYNC) == 0 || pipe_out != NO_PIPE); | |
bb70624e JA |
5189 | #endif |
5190 | ||
5191 | /* A subshell is neither a login shell nor interactive. */ | |
5192 | login_shell = interactive = 0; | |
a0c0a00f CR |
5193 | if (builtin == eval_builtin) |
5194 | evalnest = 0; | |
5195 | else if (builtin == source_builtin) | |
5196 | sourcenest = 0; | |
b72432fd | 5197 | |
0628567a JA |
5198 | if (async) |
5199 | subshell_environment |= SUBSHELL_ASYNC; | |
5200 | if (pipe_in != NO_PIPE || pipe_out != NO_PIPE) | |
5201 | subshell_environment |= SUBSHELL_PIPE; | |
726f6388 | 5202 | |
ccc6cda3 | 5203 | maybe_make_export_env (); /* XXX - is this needed? */ |
726f6388 JA |
5204 | |
5205 | #if defined (JOB_CONTROL) | |
5206 | /* Eradicate all traces of job control after we fork the subshell, so | |
5207 | all jobs begun by this subshell are in the same process group as | |
5208 | the shell itself. */ | |
5209 | ||
5210 | /* Allow the output of `jobs' to be piped. */ | |
b72432fd | 5211 | if (jobs_hack) |
726f6388 JA |
5212 | kill_current_pipeline (); |
5213 | else | |
5214 | without_job_control (); | |
5215 | ||
5216 | set_sigchld_handler (); | |
d233b485 CR |
5217 | #else |
5218 | without_job_control (); | |
726f6388 JA |
5219 | #endif /* JOB_CONTROL */ |
5220 | ||
5221 | set_sigint_handler (); | |
5222 | ||
726f6388 JA |
5223 | if (fds_to_close) |
5224 | close_fd_bitmap (fds_to_close); | |
5225 | ||
bb70624e JA |
5226 | do_piping (pipe_in, pipe_out); |
5227 | ||
b80f6443 | 5228 | if (do_redirections (redirects, RX_ACTIVE) != 0) |
726f6388 JA |
5229 | exit (EXECUTION_FAILURE); |
5230 | ||
5231 | if (builtin) | |
5232 | { | |
726f6388 JA |
5233 | /* Give builtins a place to jump back to on failure, |
5234 | so we don't go back up to main(). */ | |
ac50fbac | 5235 | result = setjmp_nosigs (top_level); |
726f6388 | 5236 | |
0628567a JA |
5237 | /* Give the return builtin a place to jump to when executed in a subshell |
5238 | or pipeline */ | |
5239 | funcvalue = 0; | |
5240 | if (return_catch_flag && builtin == return_builtin) | |
ac50fbac | 5241 | funcvalue = setjmp_nosigs (return_catch); |
0628567a | 5242 | |
726f6388 | 5243 | if (result == EXITPROG) |
8868edaf | 5244 | subshell_exit (last_command_exit_value); |
726f6388 | 5245 | else if (result) |
8868edaf | 5246 | subshell_exit (EXECUTION_FAILURE); |
0628567a | 5247 | else if (funcvalue) |
8868edaf | 5248 | subshell_exit (return_catch_value); |
726f6388 | 5249 | else |
cce855bc JA |
5250 | { |
5251 | r = execute_builtin (builtin, words, flags, 1); | |
3185942a | 5252 | fflush (stdout); |
cce855bc JA |
5253 | if (r == EX_USAGE) |
5254 | r = EX_BADUSAGE; | |
d233b485 CR |
5255 | /* XXX - experimental */ |
5256 | else if (r == EX_DISKFALLBACK) | |
5257 | { | |
5258 | char *command_line; | |
5259 | ||
5260 | command_line = savestring (the_printed_command_except_trap ? the_printed_command_except_trap : ""); | |
5261 | r = execute_disk_command (words, (REDIRECT *)0, command_line, | |
5262 | -1, -1, async, (struct fd_bitmap *)0, flags|CMD_NO_FORK); | |
5263 | } | |
8868edaf | 5264 | subshell_exit (r); |
cce855bc | 5265 | } |
726f6388 JA |
5266 | } |
5267 | else | |
3185942a JA |
5268 | { |
5269 | r = execute_function (var, words, flags, fds_to_close, async, 1); | |
5270 | fflush (stdout); | |
8868edaf | 5271 | subshell_exit (r); |
3185942a | 5272 | } |
726f6388 JA |
5273 | } |
5274 | ||
5275 | /* Execute a builtin or function in the current shell context. If BUILTIN | |
5276 | is non-null, it is the builtin command to execute, otherwise VAR points | |
5277 | to the body of a function. WORDS are the command's arguments, REDIRECTS | |
5278 | are the redirections to perform. FDS_TO_CLOSE is the usual bitmap of | |
5279 | file descriptors to close. | |
5280 | ||
5281 | If BUILTIN is exec_builtin, the redirections specified in REDIRECTS are | |
5282 | not undone before this function returns. */ | |
5283 | static int | |
5284 | execute_builtin_or_function (words, builtin, var, redirects, | |
5285 | fds_to_close, flags) | |
5286 | WORD_LIST *words; | |
f73dda09 | 5287 | sh_builtin_func_t *builtin; |
726f6388 JA |
5288 | SHELL_VAR *var; |
5289 | REDIRECT *redirects; | |
5290 | struct fd_bitmap *fds_to_close; | |
5291 | int flags; | |
5292 | { | |
ccc6cda3 | 5293 | int result; |
726f6388 | 5294 | REDIRECT *saved_undo_list; |
495aee44 CR |
5295 | #if defined (PROCESS_SUBSTITUTION) |
5296 | int ofifo, nfifo, osize; | |
8868edaf | 5297 | void *ofifo_list; |
495aee44 CR |
5298 | #endif |
5299 | ||
2fb21d75 CR |
5300 | #if defined (PROCESS_SUBSTITUTION) |
5301 | begin_unwind_frame ("saved_fifos"); | |
5302 | /* If we return, we longjmp and don't get a chance to restore the old | |
5303 | fifo list, so we add an unwind protect to free it */ | |
495aee44 CR |
5304 | ofifo = num_fifos (); |
5305 | ofifo_list = copy_fifo_list (&osize); | |
2fb21d75 CR |
5306 | if (ofifo_list) |
5307 | add_unwind_protect (xfree, ofifo_list); | |
495aee44 | 5308 | #endif |
726f6388 | 5309 | |
b80f6443 | 5310 | if (do_redirections (redirects, RX_ACTIVE|RX_UNDOABLE) != 0) |
726f6388 | 5311 | { |
d233b485 | 5312 | undo_partial_redirects (); |
726f6388 | 5313 | dispose_exec_redirects (); |
495aee44 CR |
5314 | #if defined (PROCESS_SUBSTITUTION) |
5315 | free (ofifo_list); | |
5316 | #endif | |
ccc6cda3 | 5317 | return (EX_REDIRFAIL); /* was EXECUTION_FAILURE */ |
726f6388 JA |
5318 | } |
5319 | ||
5320 | saved_undo_list = redirection_undo_list; | |
5321 | ||
5322 | /* Calling the "exec" builtin changes redirections forever. */ | |
5323 | if (builtin == exec_builtin) | |
5324 | { | |
5325 | dispose_redirects (saved_undo_list); | |
5326 | saved_undo_list = exec_redirection_undo_list; | |
5327 | exec_redirection_undo_list = (REDIRECT *)NULL; | |
5328 | } | |
5329 | else | |
5330 | dispose_exec_redirects (); | |
5331 | ||
5332 | if (saved_undo_list) | |
5333 | { | |
a0c0a00f | 5334 | begin_unwind_frame ("saved-redirects"); |
ccc6cda3 | 5335 | add_unwind_protect (cleanup_redirects, (char *)saved_undo_list); |
726f6388 JA |
5336 | } |
5337 | ||
5338 | redirection_undo_list = (REDIRECT *)NULL; | |
5339 | ||
5340 | if (builtin) | |
5341 | result = execute_builtin (builtin, words, flags, 0); | |
5342 | else | |
5343 | result = execute_function (var, words, flags, fds_to_close, 0, 0); | |
5344 | ||
b80f6443 | 5345 | /* We do this before undoing the effects of any redirections. */ |
3185942a JA |
5346 | fflush (stdout); |
5347 | fpurge (stdout); | |
b80f6443 JA |
5348 | if (ferror (stdout)) |
5349 | clearerr (stdout); | |
5350 | ||
28ef6c31 JA |
5351 | /* If we are executing the `command' builtin, but this_shell_builtin is |
5352 | set to `exec_builtin', we know that we have something like | |
5353 | `command exec [redirection]', since otherwise `exec' would have | |
5354 | overwritten the shell and we wouldn't get here. In this case, we | |
5355 | want to behave as if the `command' builtin had not been specified | |
5356 | and preserve the redirections. */ | |
5357 | if (builtin == command_builtin && this_shell_builtin == exec_builtin) | |
5358 | { | |
495aee44 CR |
5359 | int discard; |
5360 | ||
5361 | discard = 0; | |
28ef6c31 | 5362 | if (saved_undo_list) |
495aee44 CR |
5363 | { |
5364 | dispose_redirects (saved_undo_list); | |
5365 | discard = 1; | |
5366 | } | |
28ef6c31 JA |
5367 | redirection_undo_list = exec_redirection_undo_list; |
5368 | saved_undo_list = exec_redirection_undo_list = (REDIRECT *)NULL; | |
495aee44 | 5369 | if (discard) |
a0c0a00f | 5370 | discard_unwind_frame ("saved-redirects"); |
28ef6c31 JA |
5371 | } |
5372 | ||
726f6388 JA |
5373 | if (saved_undo_list) |
5374 | { | |
5375 | redirection_undo_list = saved_undo_list; | |
a0c0a00f | 5376 | discard_unwind_frame ("saved-redirects"); |
726f6388 JA |
5377 | } |
5378 | ||
d233b485 | 5379 | undo_partial_redirects (); |
726f6388 | 5380 | |
495aee44 CR |
5381 | #if defined (PROCESS_SUBSTITUTION) |
5382 | /* Close any FIFOs created by this builtin or function. */ | |
5383 | nfifo = num_fifos (); | |
5384 | if (nfifo > ofifo) | |
5385 | close_new_fifos (ofifo_list, osize); | |
2fb21d75 CR |
5386 | if (ofifo_list) |
5387 | free (ofifo_list); | |
5388 | discard_unwind_frame ("saved_fifos"); | |
495aee44 CR |
5389 | #endif |
5390 | ||
726f6388 JA |
5391 | return (result); |
5392 | } | |
5393 | ||
5394 | void | |
5395 | setup_async_signals () | |
5396 | { | |
b72432fd JA |
5397 | #if defined (__BEOS__) |
5398 | set_signal_handler (SIGHUP, SIG_IGN); /* they want csh-like behavior */ | |
5399 | #endif | |
5400 | ||
726f6388 JA |
5401 | #if defined (JOB_CONTROL) |
5402 | if (job_control == 0) | |
5403 | #endif | |
5404 | { | |
ac50fbac CR |
5405 | /* Make sure we get the original signal dispositions now so we don't |
5406 | confuse the trap builtin later if the subshell tries to use it to | |
5407 | reset SIGINT/SIGQUIT. Don't call set_signal_ignored; that sets | |
5408 | the value of original_signals to SIG_IGN. Posix interpretation 751. */ | |
5409 | get_original_signal (SIGINT); | |
726f6388 | 5410 | set_signal_handler (SIGINT, SIG_IGN); |
ac50fbac CR |
5411 | |
5412 | get_original_signal (SIGQUIT); | |
726f6388 | 5413 | set_signal_handler (SIGQUIT, SIG_IGN); |
726f6388 JA |
5414 | } |
5415 | } | |
5416 | ||
5417 | /* Execute a simple command that is hopefully defined in a disk file | |
5418 | somewhere. | |
5419 | ||
5420 | 1) fork () | |
5421 | 2) connect pipes | |
5422 | 3) look up the command | |
5423 | 4) do redirections | |
5424 | 5) execve () | |
5425 | 6) If the execve failed, see if the file has executable mode set. | |
5426 | If so, and it isn't a directory, then execute its contents as | |
5427 | a shell script. | |
5428 | ||
5429 | Note that the filename hashing stuff has to take place up here, | |
5430 | in the parent. This is probably why the Bourne style shells | |
5431 | don't handle it, since that would require them to go through | |
b80f6443 JA |
5432 | this gnarly hair, for no good reason. |
5433 | ||
5434 | NOTE: callers expect this to fork or exit(). */ | |
3185942a JA |
5435 | |
5436 | /* Name of a shell function to call when a command name is not found. */ | |
5437 | #ifndef NOTFOUND_HOOK | |
5438 | # define NOTFOUND_HOOK "command_not_found_handle" | |
5439 | #endif | |
5440 | ||
495aee44 | 5441 | static int |
726f6388 | 5442 | execute_disk_command (words, redirects, command_line, pipe_in, pipe_out, |
d166f048 | 5443 | async, fds_to_close, cmdflags) |
726f6388 JA |
5444 | WORD_LIST *words; |
5445 | REDIRECT *redirects; | |
5446 | char *command_line; | |
5447 | int pipe_in, pipe_out, async; | |
5448 | struct fd_bitmap *fds_to_close; | |
d166f048 | 5449 | int cmdflags; |
726f6388 | 5450 | { |
d233b485 | 5451 | char *pathname, *command, **args, *p; |
8868edaf | 5452 | int nofork, stdpath, result, fork_flags; |
bb70624e | 5453 | pid_t pid; |
3185942a JA |
5454 | SHELL_VAR *hookf; |
5455 | WORD_LIST *wl; | |
726f6388 | 5456 | |
a0c0a00f CR |
5457 | stdpath = (cmdflags & CMD_STDPATH); /* use command -p path */ |
5458 | nofork = (cmdflags & CMD_NO_FORK); /* Don't fork, just exec, if no pipes */ | |
726f6388 | 5459 | pathname = words->word->word; |
ccc6cda3 | 5460 | |
d233b485 | 5461 | p = 0; |
495aee44 | 5462 | result = EXECUTION_SUCCESS; |
726f6388 | 5463 | #if defined (RESTRICTED_SHELL) |
b80f6443 | 5464 | command = (char *)NULL; |
0001803f | 5465 | if (restricted && mbschr (pathname, '/')) |
726f6388 | 5466 | { |
b80f6443 | 5467 | internal_error (_("%s: restricted: cannot specify `/' in command names"), |
726f6388 | 5468 | pathname); |
495aee44 | 5469 | result = last_command_exit_value = EXECUTION_FAILURE; |
b80f6443 JA |
5470 | |
5471 | /* If we're not going to fork below, we must already be in a child | |
5472 | process or a context in which it's safe to call exit(2). */ | |
5473 | if (nofork && pipe_in == NO_PIPE && pipe_out == NO_PIPE) | |
5474 | exit (last_command_exit_value); | |
5475 | else | |
5476 | goto parent_return; | |
726f6388 JA |
5477 | } |
5478 | #endif /* RESTRICTED_SHELL */ | |
5479 | ||
a0c0a00f | 5480 | command = search_for_command (pathname, CMDSRCH_HASH|(stdpath ? CMDSRCH_STDPATH : 0)); |
d233b485 | 5481 | QUIT; |
726f6388 | 5482 | |
ccc6cda3 | 5483 | if (command) |
726f6388 | 5484 | { |
d233b485 CR |
5485 | /* If we're optimizing out the fork (implicit `exec'), decrement the |
5486 | shell level like `exec' would do. */ | |
8868edaf CR |
5487 | #if 0 /* TAG: bash-5.2 psmith 10/11/2020 */ |
5488 | if (nofork && pipe_in == NO_PIPE && pipe_out == NO_PIPE && (subshell_environment & SUBSHELL_PIPE) == 0) | |
5489 | #else | |
d233b485 | 5490 | if (nofork && pipe_in == NO_PIPE && pipe_out == NO_PIPE) |
8868edaf | 5491 | #endif |
d233b485 CR |
5492 | adjust_shell_level (-1); |
5493 | ||
ccc6cda3 JA |
5494 | maybe_make_export_env (); |
5495 | put_command_name_into_env (command); | |
726f6388 JA |
5496 | } |
5497 | ||
bb70624e | 5498 | /* We have to make the child before we check for the non-existence |
726f6388 JA |
5499 | of COMMAND, since we want the error messages to be redirected. */ |
5500 | /* If we can get away without forking and there are no pipes to deal with, | |
5501 | don't bother to fork, just directly exec the command. */ | |
5502 | if (nofork && pipe_in == NO_PIPE && pipe_out == NO_PIPE) | |
5503 | pid = 0; | |
5504 | else | |
8868edaf CR |
5505 | { |
5506 | fork_flags = async ? FORK_ASYNC : 0; | |
5507 | pid = make_child (p = savestring (command_line), fork_flags); | |
5508 | } | |
726f6388 JA |
5509 | |
5510 | if (pid == 0) | |
5511 | { | |
5512 | int old_interactive; | |
5513 | ||
495aee44 | 5514 | reset_terminating_signals (); /* XXX */ |
726f6388 JA |
5515 | /* Cancel traps, in trap.c. */ |
5516 | restore_original_signals (); | |
5517 | ||
d233b485 CR |
5518 | #if defined (JOB_CONTROL) |
5519 | FREE (p); | |
5520 | #endif | |
5521 | ||
726f6388 | 5522 | /* restore_original_signals may have undone the work done |
cce855bc JA |
5523 | by make_child to ensure that SIGINT and SIGQUIT are ignored |
5524 | in asynchronous children. */ | |
726f6388 | 5525 | if (async) |
d166f048 JA |
5526 | { |
5527 | if ((cmdflags & CMD_STDIN_REDIR) && | |
5528 | pipe_in == NO_PIPE && | |
5529 | (stdin_redirects (redirects) == 0)) | |
5530 | async_redirect_stdin (); | |
5531 | setup_async_signals (); | |
5532 | } | |
726f6388 | 5533 | |
bb70624e JA |
5534 | /* This functionality is now provided by close-on-exec of the |
5535 | file descriptors manipulated by redirection and piping. | |
5536 | Some file descriptors still need to be closed in all children | |
5537 | because of the way bash does pipes; fds_to_close is a | |
5538 | bitmap of all such file descriptors. */ | |
5539 | if (fds_to_close) | |
5540 | close_fd_bitmap (fds_to_close); | |
5541 | ||
726f6388 JA |
5542 | do_piping (pipe_in, pipe_out); |
5543 | ||
f73dda09 | 5544 | old_interactive = interactive; |
726f6388 | 5545 | if (async) |
f73dda09 | 5546 | interactive = 0; |
726f6388 | 5547 | |
a0c0a00f | 5548 | subshell_environment |= SUBSHELL_FORK; /* XXX - was just = */ |
726f6388 | 5549 | |
8868edaf CR |
5550 | #if defined (PROCESS_SUBSTITUTION) && !defined (HAVE_DEV_FD) |
5551 | clear_fifo_list (); /* XXX - we haven't created any FIFOs */ | |
5552 | #endif | |
5553 | ||
b80f6443 | 5554 | if (redirects && (do_redirections (redirects, RX_ACTIVE) != 0)) |
726f6388 JA |
5555 | { |
5556 | #if defined (PROCESS_SUBSTITUTION) | |
5557 | /* Try to remove named pipes that may have been created as the | |
5558 | result of redirections. */ | |
5559 | unlink_fifo_list (); | |
5560 | #endif /* PROCESS_SUBSTITUTION */ | |
5561 | exit (EXECUTION_FAILURE); | |
5562 | } | |
5563 | ||
5564 | if (async) | |
5565 | interactive = old_interactive; | |
5566 | ||
ccc6cda3 | 5567 | if (command == 0) |
726f6388 | 5568 | { |
3185942a JA |
5569 | hookf = find_function (NOTFOUND_HOOK); |
5570 | if (hookf == 0) | |
5571 | { | |
495aee44 | 5572 | /* Make sure filenames are displayed using printable characters */ |
a0c0a00f | 5573 | pathname = printable_filename (pathname, 0); |
3185942a JA |
5574 | internal_error (_("%s: command not found"), pathname); |
5575 | exit (EX_NOTFOUND); /* Posix.2 says the exit status is 127 */ | |
5576 | } | |
5577 | ||
d233b485 CR |
5578 | /* We don't want to manage process groups for processes we start |
5579 | from here, so we turn off job control and don't attempt to | |
5580 | manipulate the terminal's process group. */ | |
5581 | without_job_control (); | |
5582 | ||
ac50fbac | 5583 | #if defined (JOB_CONTROL) |
d233b485 | 5584 | set_sigchld_handler (); |
ac50fbac CR |
5585 | #endif |
5586 | ||
3185942a JA |
5587 | wl = make_word_list (make_word (NOTFOUND_HOOK), words); |
5588 | exit (execute_shell_function (hookf, wl)); | |
726f6388 JA |
5589 | } |
5590 | ||
ccc6cda3 JA |
5591 | /* Execve expects the command name to be in args[0]. So we |
5592 | leave it there, in the same format that the user used to | |
5593 | type it in. */ | |
7117c2d2 | 5594 | args = strvec_from_word_list (words, 0, 0, (int *)NULL); |
726f6388 JA |
5595 | exit (shell_execve (command, args, export_env)); |
5596 | } | |
5597 | else | |
5598 | { | |
b80f6443 | 5599 | parent_return: |
ac50fbac CR |
5600 | QUIT; |
5601 | ||
726f6388 JA |
5602 | /* Make sure that the pipes are closed in the parent. */ |
5603 | close_pipes (pipe_in, pipe_out); | |
5604 | #if defined (PROCESS_SUBSTITUTION) && defined (HAVE_DEV_FD) | |
d233b485 | 5605 | #if 0 |
0001803f CR |
5606 | if (variable_context == 0) |
5607 | unlink_fifo_list (); | |
d233b485 | 5608 | #endif |
726f6388 JA |
5609 | #endif |
5610 | FREE (command); | |
495aee44 | 5611 | return (result); |
726f6388 JA |
5612 | } |
5613 | } | |
5614 | ||
28ef6c31 JA |
5615 | /* CPP defines to decide whether a particular index into the #! line |
5616 | corresponds to a valid interpreter name or argument character, or | |
5617 | whitespace. The MSDOS define is to allow \r to be treated the same | |
5618 | as \n. */ | |
5619 | ||
5620 | #if !defined (MSDOS) | |
5621 | # define STRINGCHAR(ind) \ | |
f73dda09 | 5622 | (ind < sample_len && !whitespace (sample[ind]) && sample[ind] != '\n') |
28ef6c31 | 5623 | # define WHITECHAR(ind) \ |
f73dda09 | 5624 | (ind < sample_len && whitespace (sample[ind])) |
28ef6c31 JA |
5625 | #else /* MSDOS */ |
5626 | # define STRINGCHAR(ind) \ | |
f73dda09 | 5627 | (ind < sample_len && !whitespace (sample[ind]) && sample[ind] != '\n' && sample[ind] != '\r') |
28ef6c31 | 5628 | # define WHITECHAR(ind) \ |
f73dda09 | 5629 | (ind < sample_len && whitespace (sample[ind])) |
28ef6c31 JA |
5630 | #endif /* MSDOS */ |
5631 | ||
f73dda09 JA |
5632 | static char * |
5633 | getinterp (sample, sample_len, endp) | |
5634 | char *sample; | |
5635 | int sample_len, *endp; | |
726f6388 JA |
5636 | { |
5637 | register int i; | |
f73dda09 JA |
5638 | char *execname; |
5639 | int start; | |
726f6388 JA |
5640 | |
5641 | /* Find the name of the interpreter to exec. */ | |
f73dda09 | 5642 | for (i = 2; i < sample_len && whitespace (sample[i]); i++) |
726f6388 JA |
5643 | ; |
5644 | ||
28ef6c31 | 5645 | for (start = i; STRINGCHAR(i); i++) |
726f6388 JA |
5646 | ; |
5647 | ||
f73dda09 JA |
5648 | execname = substring (sample, start, i); |
5649 | ||
5650 | if (endp) | |
5651 | *endp = i; | |
5652 | return execname; | |
5653 | } | |
5654 | ||
5655 | #if !defined (HAVE_HASH_BANG_EXEC) | |
5656 | /* If the operating system on which we're running does not handle | |
5657 | the #! executable format, then help out. SAMPLE is the text read | |
5658 | from the file, SAMPLE_LEN characters. COMMAND is the name of | |
5659 | the script; it and ARGS, the arguments given by the user, will | |
5660 | become arguments to the specified interpreter. ENV is the environment | |
5661 | to pass to the interpreter. | |
5662 | ||
5663 | The word immediately following the #! is the interpreter to execute. | |
5664 | A single argument to the interpreter is allowed. */ | |
5665 | ||
5666 | static int | |
5667 | execute_shell_script (sample, sample_len, command, args, env) | |
5668 | char *sample; | |
5669 | int sample_len; | |
5670 | char *command; | |
5671 | char **args, **env; | |
5672 | { | |
5673 | char *execname, *firstarg; | |
5674 | int i, start, size_increment, larry; | |
5675 | ||
5676 | /* Find the name of the interpreter to exec. */ | |
5677 | execname = getinterp (sample, sample_len, &i); | |
726f6388 JA |
5678 | size_increment = 1; |
5679 | ||
5680 | /* Now the argument, if any. */ | |
28ef6c31 | 5681 | for (firstarg = (char *)NULL, start = i; WHITECHAR(i); i++) |
726f6388 JA |
5682 | ; |
5683 | ||
5684 | /* If there is more text on the line, then it is an argument for the | |
5685 | interpreter. */ | |
28ef6c31 JA |
5686 | |
5687 | if (STRINGCHAR(i)) | |
726f6388 | 5688 | { |
28ef6c31 | 5689 | for (start = i; STRINGCHAR(i); i++) |
726f6388 | 5690 | ; |
bb70624e | 5691 | firstarg = substring ((char *)sample, start, i); |
726f6388 JA |
5692 | size_increment = 2; |
5693 | } | |
5694 | ||
7117c2d2 JA |
5695 | larry = strvec_len (args) + size_increment; |
5696 | args = strvec_resize (args, larry + 1); | |
726f6388 JA |
5697 | |
5698 | for (i = larry - 1; i; i--) | |
5699 | args[i] = args[i - size_increment]; | |
5700 | ||
5701 | args[0] = execname; | |
5702 | if (firstarg) | |
5703 | { | |
5704 | args[1] = firstarg; | |
5705 | args[2] = command; | |
5706 | } | |
5707 | else | |
5708 | args[1] = command; | |
5709 | ||
5710 | args[larry] = (char *)NULL; | |
5711 | ||
5712 | return (shell_execve (execname, args, env)); | |
5713 | } | |
28ef6c31 JA |
5714 | #undef STRINGCHAR |
5715 | #undef WHITECHAR | |
5716 | ||
ccc6cda3 JA |
5717 | #endif /* !HAVE_HASH_BANG_EXEC */ |
5718 | ||
d166f048 JA |
5719 | static void |
5720 | initialize_subshell () | |
5721 | { | |
5722 | #if defined (ALIAS) | |
5723 | /* Forget about any aliases that we knew of. We are in a subshell. */ | |
5724 | delete_all_aliases (); | |
5725 | #endif /* ALIAS */ | |
5726 | ||
5727 | #if defined (HISTORY) | |
5728 | /* Forget about the history lines we have read. This is a non-interactive | |
5729 | subshell. */ | |
5730 | history_lines_this_session = 0; | |
5731 | #endif | |
5732 | ||
d166f048 JA |
5733 | /* Forget about the way job control was working. We are in a subshell. */ |
5734 | without_job_control (); | |
a0c0a00f CR |
5735 | |
5736 | #if defined (JOB_CONTROL) | |
d166f048 | 5737 | set_sigchld_handler (); |
95732b49 | 5738 | init_job_stats (); |
d166f048 JA |
5739 | #endif /* JOB_CONTROL */ |
5740 | ||
5741 | /* Reset the values of the shell flags and options. */ | |
5742 | reset_shell_flags (); | |
5743 | reset_shell_options (); | |
5744 | reset_shopt_options (); | |
5745 | ||
28ef6c31 JA |
5746 | /* Zero out builtin_env, since this could be a shell script run from a |
5747 | sourced file with a temporary environment supplied to the `source/.' | |
5748 | builtin. Such variables are not supposed to be exported (empirical | |
7117c2d2 JA |
5749 | testing with sh and ksh). Just throw it away; don't worry about a |
5750 | memory leak. */ | |
5751 | if (vc_isbltnenv (shell_variables)) | |
5752 | shell_variables = shell_variables->down; | |
28ef6c31 JA |
5753 | |
5754 | clear_unwind_protect_list (0); | |
f1be666c JA |
5755 | /* XXX -- are there other things we should be resetting here? */ |
5756 | parse_and_execute_level = 0; /* nothing left to restore it */ | |
28ef6c31 JA |
5757 | |
5758 | /* We're no longer inside a shell function. */ | |
a0c0a00f | 5759 | variable_context = return_catch_flag = funcnest = evalnest = sourcenest = 0; |
28ef6c31 | 5760 | |
3185942a JA |
5761 | executing_list = 0; /* XXX */ |
5762 | ||
d166f048 JA |
5763 | /* If we're not interactive, close the file descriptor from which we're |
5764 | reading the current shell script. */ | |
cce855bc | 5765 | if (interactive_shell == 0) |
b80f6443 | 5766 | unset_bash_input (0); |
d166f048 JA |
5767 | } |
5768 | ||
ccc6cda3 JA |
5769 | #if defined (HAVE_SETOSTYPE) && defined (_POSIX_SOURCE) |
5770 | # define SETOSTYPE(x) __setostype(x) | |
5771 | #else | |
5772 | # define SETOSTYPE(x) | |
5773 | #endif | |
726f6388 | 5774 | |
a0c0a00f CR |
5775 | #define HASH_BANG_BUFSIZ 128 |
5776 | ||
28ef6c31 JA |
5777 | #define READ_SAMPLE_BUF(file, buf, len) \ |
5778 | do \ | |
5779 | { \ | |
5780 | fd = open(file, O_RDONLY); \ | |
5781 | if (fd >= 0) \ | |
5782 | { \ | |
a0c0a00f | 5783 | len = read (fd, buf, HASH_BANG_BUFSIZ); \ |
28ef6c31 JA |
5784 | close (fd); \ |
5785 | } \ | |
5786 | else \ | |
5787 | len = -1; \ | |
5788 | } \ | |
5789 | while (0) | |
5790 | ||
726f6388 JA |
5791 | /* Call execve (), handling interpreting shell scripts, and handling |
5792 | exec failures. */ | |
5793 | int | |
5794 | shell_execve (command, args, env) | |
5795 | char *command; | |
5796 | char **args, **env; | |
5797 | { | |
ccc6cda3 | 5798 | int larray, i, fd; |
a0c0a00f | 5799 | char sample[HASH_BANG_BUFSIZ]; |
28ef6c31 | 5800 | int sample_len; |
ccc6cda3 JA |
5801 | |
5802 | SETOSTYPE (0); /* Some systems use for USG/POSIX semantics */ | |
726f6388 | 5803 | execve (command, args, env); |
28ef6c31 | 5804 | i = errno; /* error from execve() */ |
3185942a | 5805 | CHECK_TERMSIG; |
ccc6cda3 | 5806 | SETOSTYPE (1); |
726f6388 JA |
5807 | |
5808 | /* If we get to this point, then start checking out the file. | |
5809 | Maybe it is something we can hack ourselves. */ | |
28ef6c31 | 5810 | if (i != ENOEXEC) |
ccc6cda3 | 5811 | { |
a0c0a00f CR |
5812 | /* make sure this is set correctly for file_error/report_error */ |
5813 | last_command_exit_value = (i == ENOENT) ? EX_NOTFOUND : EX_NOEXEC; /* XXX Posix.2 says that exit status is 126 */ | |
3185942a | 5814 | if (file_isdir (command)) |
495aee44 CR |
5815 | #if defined (EISDIR) |
5816 | internal_error (_("%s: %s"), command, strerror (EISDIR)); | |
5817 | #else | |
b80f6443 | 5818 | internal_error (_("%s: is a directory"), command); |
495aee44 | 5819 | #endif |
7117c2d2 JA |
5820 | else if (executable_file (command) == 0) |
5821 | { | |
5822 | errno = i; | |
5823 | file_error (command); | |
5824 | } | |
95732b49 JA |
5825 | /* errors not involving the path argument to execve. */ |
5826 | else if (i == E2BIG || i == ENOMEM) | |
5827 | { | |
5828 | errno = i; | |
5829 | file_error (command); | |
5830 | } | |
ccc6cda3 JA |
5831 | else |
5832 | { | |
7117c2d2 JA |
5833 | /* The file has the execute bits set, but the kernel refuses to |
5834 | run it for some reason. See why. */ | |
28ef6c31 JA |
5835 | #if defined (HAVE_HASH_BANG_EXEC) |
5836 | READ_SAMPLE_BUF (command, sample, sample_len); | |
a0c0a00f CR |
5837 | if (sample_len > 0) |
5838 | sample[sample_len - 1] = '\0'; | |
28ef6c31 JA |
5839 | if (sample_len > 2 && sample[0] == '#' && sample[1] == '!') |
5840 | { | |
f73dda09 | 5841 | char *interp; |
95732b49 | 5842 | int ilen; |
f73dda09 JA |
5843 | |
5844 | interp = getinterp (sample, sample_len, (int *)NULL); | |
95732b49 | 5845 | ilen = strlen (interp); |
28ef6c31 | 5846 | errno = i; |
95732b49 JA |
5847 | if (interp[ilen - 1] == '\r') |
5848 | { | |
5849 | interp = xrealloc (interp, ilen + 2); | |
5850 | interp[ilen - 1] = '^'; | |
5851 | interp[ilen] = 'M'; | |
5852 | interp[ilen + 1] = '\0'; | |
5853 | } | |
b80f6443 | 5854 | sys_error (_("%s: %s: bad interpreter"), command, interp ? interp : ""); |
f73dda09 | 5855 | FREE (interp); |
28ef6c31 JA |
5856 | return (EX_NOEXEC); |
5857 | } | |
5858 | #endif | |
ccc6cda3 | 5859 | errno = i; |
726f6388 | 5860 | file_error (command); |
ccc6cda3 | 5861 | } |
a0c0a00f | 5862 | return (last_command_exit_value); |
ccc6cda3 | 5863 | } |
726f6388 | 5864 | |
ccc6cda3 JA |
5865 | /* This file is executable. |
5866 | If it begins with #!, then help out people with losing operating | |
5867 | systems. Otherwise, check to see if it is a binary file by seeing | |
28ef6c31 JA |
5868 | if the contents of the first line (or up to 80 characters) are in the |
5869 | ASCII set. If it's a text file, execute the contents as shell commands, | |
5870 | otherwise return 126 (EX_BINARY_FILE). */ | |
5871 | READ_SAMPLE_BUF (command, sample, sample_len); | |
ccc6cda3 | 5872 | |
28ef6c31 JA |
5873 | if (sample_len == 0) |
5874 | return (EXECUTION_SUCCESS); | |
ccc6cda3 | 5875 | |
28ef6c31 JA |
5876 | /* Is this supposed to be an executable script? |
5877 | If so, the format of the line is "#! interpreter [argument]". | |
5878 | A single argument is allowed. The BSD kernel restricts | |
5879 | the length of the entire line to 32 characters (32 bytes | |
5880 | being the size of the BSD exec header), but we allow 80 | |
5881 | characters. */ | |
5882 | if (sample_len > 0) | |
5883 | { | |
ccc6cda3 | 5884 | #if !defined (HAVE_HASH_BANG_EXEC) |
28ef6c31 JA |
5885 | if (sample_len > 2 && sample[0] == '#' && sample[1] == '!') |
5886 | return (execute_shell_script (sample, sample_len, command, args, env)); | |
5887 | else | |
ccc6cda3 | 5888 | #endif |
28ef6c31 JA |
5889 | if (check_binary_file (sample, sample_len)) |
5890 | { | |
ac50fbac | 5891 | internal_error (_("%s: cannot execute binary file: %s"), command, strerror (i)); |
a0c0a00f | 5892 | errno = i; |
28ef6c31 | 5893 | return (EX_BINARY_FILE); |
726f6388 | 5894 | } |
ccc6cda3 JA |
5895 | } |
5896 | ||
28ef6c31 JA |
5897 | /* We have committed to attempting to execute the contents of this file |
5898 | as shell commands. */ | |
5899 | ||
a0c0a00f | 5900 | reset_parser (); |
d166f048 | 5901 | initialize_subshell (); |
726f6388 | 5902 | |
ccc6cda3 | 5903 | set_sigint_handler (); |
726f6388 | 5904 | |
ccc6cda3 | 5905 | /* Insert the name of this shell into the argument list. */ |
7117c2d2 JA |
5906 | larray = strvec_len (args) + 1; |
5907 | args = strvec_resize (args, larray + 1); | |
726f6388 | 5908 | |
ccc6cda3 JA |
5909 | for (i = larray - 1; i; i--) |
5910 | args[i] = args[i - 1]; | |
726f6388 | 5911 | |
ccc6cda3 JA |
5912 | args[0] = shell_name; |
5913 | args[1] = command; | |
5914 | args[larray] = (char *)NULL; | |
726f6388 | 5915 | |
ccc6cda3 JA |
5916 | if (args[0][0] == '-') |
5917 | args[0]++; | |
726f6388 | 5918 | |
ccc6cda3 JA |
5919 | #if defined (RESTRICTED_SHELL) |
5920 | if (restricted) | |
5921 | change_flag ('r', FLAG_OFF); | |
5922 | #endif | |
726f6388 | 5923 | |
ccc6cda3 JA |
5924 | if (subshell_argv) |
5925 | { | |
5926 | /* Can't free subshell_argv[0]; that is shell_name. */ | |
5927 | for (i = 1; i < subshell_argc; i++) | |
5928 | free (subshell_argv[i]); | |
5929 | free (subshell_argv); | |
5930 | } | |
5931 | ||
5932 | dispose_command (currently_executing_command); /* XXX */ | |
5933 | currently_executing_command = (COMMAND *)NULL; | |
5934 | ||
5935 | subshell_argc = larray; | |
5936 | subshell_argv = args; | |
5937 | subshell_envp = env; | |
5938 | ||
5939 | unbind_args (); /* remove the positional parameters */ | |
5940 | ||
8868edaf | 5941 | #if defined (PROCESS_SUBSTITUTION) && defined (HAVE_DEV_FD) |
a0c0a00f CR |
5942 | clear_fifo_list (); /* pipe fds are what they are now */ |
5943 | #endif | |
5944 | ||
5945 | sh_longjmp (subshell_top_level, 1); | |
f73dda09 | 5946 | /*NOTREACHED*/ |
ccc6cda3 JA |
5947 | } |
5948 | ||
5949 | static int | |
ac50fbac | 5950 | execute_intern_function (name, funcdef) |
ccc6cda3 | 5951 | WORD_DESC *name; |
ac50fbac | 5952 | FUNCTION_DEF *funcdef; |
ccc6cda3 JA |
5953 | { |
5954 | SHELL_VAR *var; | |
d233b485 | 5955 | char *t; |
ccc6cda3 JA |
5956 | |
5957 | if (check_identifier (name, posixly_correct) == 0) | |
5958 | { | |
5959 | if (posixly_correct && interactive_shell == 0) | |
5960 | { | |
3185942a | 5961 | last_command_exit_value = EX_BADUSAGE; |
b80f6443 | 5962 | jump_to_top_level (ERREXIT); |
ccc6cda3 JA |
5963 | } |
5964 | return (EXECUTION_FAILURE); | |
5965 | } | |
5966 | ||
d233b485 CR |
5967 | if (strchr (name->word, CTLESC)) /* WHY? */ |
5968 | { | |
5969 | t = dequote_escapes (name->word); | |
5970 | free (name->word); | |
5971 | name->word = t; | |
5972 | } | |
5973 | ||
ac50fbac CR |
5974 | /* Posix interpretation 383 */ |
5975 | if (posixly_correct && find_special_builtin (name->word)) | |
5976 | { | |
5977 | internal_error (_("`%s': is a special builtin"), name->word); | |
5978 | last_command_exit_value = EX_BADUSAGE; | |
a0c0a00f | 5979 | jump_to_top_level (interactive_shell ? DISCARD : ERREXIT); |
ac50fbac CR |
5980 | } |
5981 | ||
ccc6cda3 | 5982 | var = find_function (name->word); |
28ef6c31 | 5983 | if (var && (readonly_p (var) || noassign_p (var))) |
ccc6cda3 | 5984 | { |
28ef6c31 | 5985 | if (readonly_p (var)) |
b80f6443 | 5986 | internal_error (_("%s: readonly function"), var->name); |
ccc6cda3 JA |
5987 | return (EXECUTION_FAILURE); |
5988 | } | |
5989 | ||
ac50fbac | 5990 | #if defined (DEBUGGER) |
d233b485 | 5991 | bind_function_def (name->word, funcdef, 1); |
ac50fbac CR |
5992 | #endif |
5993 | ||
5994 | bind_function (name->word, funcdef->command); | |
ccc6cda3 | 5995 | return (EXECUTION_SUCCESS); |
726f6388 JA |
5996 | } |
5997 | ||
d166f048 | 5998 | #if defined (INCLUDE_UNUSED) |
726f6388 | 5999 | #if defined (PROCESS_SUBSTITUTION) |
726f6388 JA |
6000 | void |
6001 | close_all_files () | |
6002 | { | |
6003 | register int i, fd_table_size; | |
6004 | ||
6005 | fd_table_size = getdtablesize (); | |
6006 | if (fd_table_size > 256) /* clamp to a reasonable value */ | |
7117c2d2 | 6007 | fd_table_size = 256; |
726f6388 JA |
6008 | |
6009 | for (i = 3; i < fd_table_size; i++) | |
6010 | close (i); | |
6011 | } | |
6012 | #endif /* PROCESS_SUBSTITUTION */ | |
d166f048 | 6013 | #endif |
726f6388 JA |
6014 | |
6015 | static void | |
6016 | close_pipes (in, out) | |
6017 | int in, out; | |
6018 | { | |
6019 | if (in >= 0) | |
6020 | close (in); | |
6021 | if (out >= 0) | |
6022 | close (out); | |
6023 | } | |
6024 | ||
b80f6443 JA |
6025 | static void |
6026 | dup_error (oldd, newd) | |
6027 | int oldd, newd; | |
6028 | { | |
6029 | sys_error (_("cannot duplicate fd %d to fd %d"), oldd, newd); | |
6030 | } | |
6031 | ||
726f6388 JA |
6032 | /* Redirect input and output to be from and to the specified pipes. |
6033 | NO_PIPE and REDIRECT_BOTH are handled correctly. */ | |
6034 | static void | |
6035 | do_piping (pipe_in, pipe_out) | |
6036 | int pipe_in, pipe_out; | |
6037 | { | |
6038 | if (pipe_in != NO_PIPE) | |
6039 | { | |
6040 | if (dup2 (pipe_in, 0) < 0) | |
b80f6443 | 6041 | dup_error (pipe_in, 0); |
726f6388 | 6042 | if (pipe_in > 0) |
cce855bc | 6043 | close (pipe_in); |
495aee44 CR |
6044 | #ifdef __CYGWIN__ |
6045 | /* Let stdio know the fd may have changed from text to binary mode. */ | |
6046 | freopen (NULL, "r", stdin); | |
6047 | #endif /* __CYGWIN__ */ | |
726f6388 JA |
6048 | } |
6049 | if (pipe_out != NO_PIPE) | |
6050 | { | |
6051 | if (pipe_out != REDIRECT_BOTH) | |
6052 | { | |
6053 | if (dup2 (pipe_out, 1) < 0) | |
b80f6443 | 6054 | dup_error (pipe_out, 1); |
726f6388 JA |
6055 | if (pipe_out == 0 || pipe_out > 1) |
6056 | close (pipe_out); | |
6057 | } | |
6058 | else | |
ccc6cda3 | 6059 | { |
cce855bc | 6060 | if (dup2 (1, 2) < 0) |
b80f6443 | 6061 | dup_error (1, 2); |
ccc6cda3 | 6062 | } |
495aee44 CR |
6063 | #ifdef __CYGWIN__ |
6064 | /* Let stdio know the fd may have changed from text to binary mode, and | |
6065 | make sure to preserve stdout line buffering. */ | |
6066 | freopen (NULL, "w", stdout); | |
6067 | sh_setlinebuf (stdout); | |
6068 | #endif /* __CYGWIN__ */ | |
d166f048 | 6069 | } |
726f6388 | 6070 | } |