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Commit | Line | Data |
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0628567a | 1 | /* execute_cmd.c -- Execute a COMMAND structure. */ |
726f6388 | 2 | |
d233b485 | 3 | /* Copyright (C) 1987-2018 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; |
f73dda09 | 112 | #if 0 |
ccc6cda3 | 113 | extern char *glob_argv_flags; |
f73dda09 | 114 | #endif |
726f6388 | 115 | |
f73dda09 | 116 | extern int close __P((int)); |
726f6388 JA |
117 | |
118 | /* Static functions defined and used in this file. */ | |
f73dda09 JA |
119 | static void close_pipes __P((int, int)); |
120 | static void do_piping __P((int, int)); | |
121 | static void bind_lastarg __P((char *)); | |
122 | static int shell_control_structure __P((enum command_type)); | |
123 | static void cleanup_redirects __P((REDIRECT *)); | |
124 | ||
125 | #if defined (JOB_CONTROL) | |
126 | static int restore_signal_mask __P((sigset_t *)); | |
127 | #endif | |
ccc6cda3 | 128 | |
f73dda09 JA |
129 | static void async_redirect_stdin __P((void)); |
130 | ||
131 | static int builtin_status __P((int)); | |
132 | ||
133 | static int execute_for_command __P((FOR_COM *)); | |
ccc6cda3 | 134 | #if defined (SELECT_COMMAND) |
495aee44 | 135 | static int displen __P((const char *)); |
f73dda09 JA |
136 | static int print_index_and_element __P((int, int, WORD_LIST *)); |
137 | static void indent __P((int, int)); | |
138 | static void print_select_list __P((WORD_LIST *, int, int, int)); | |
7117c2d2 | 139 | static char *select_query __P((WORD_LIST *, int, char *, int)); |
f73dda09 | 140 | static int execute_select_command __P((SELECT_COM *)); |
ccc6cda3 | 141 | #endif |
cce855bc | 142 | #if defined (DPAREN_ARITHMETIC) |
f73dda09 | 143 | static int execute_arith_command __P((ARITH_COM *)); |
cce855bc JA |
144 | #endif |
145 | #if defined (COND_COMMAND) | |
f73dda09 JA |
146 | static int execute_cond_node __P((COND_COM *)); |
147 | static int execute_cond_command __P((COND_COM *)); | |
cce855bc | 148 | #endif |
d166f048 | 149 | #if defined (COMMAND_TIMING) |
f73dda09 JA |
150 | static int mkfmt __P((char *, int, int, time_t, int)); |
151 | static void print_formatted_time __P((FILE *, char *, | |
152 | time_t, int, time_t, int, | |
153 | time_t, int, int)); | |
154 | static int time_command __P((COMMAND *, int, int, int, struct fd_bitmap *)); | |
d166f048 | 155 | #endif |
bb70624e | 156 | #if defined (ARITH_FOR_COMMAND) |
7117c2d2 | 157 | static intmax_t eval_arith_for_expr __P((WORD_LIST *, int *)); |
f73dda09 | 158 | static int execute_arith_for_command __P((ARITH_FOR_COM *)); |
bb70624e | 159 | #endif |
f73dda09 JA |
160 | static int execute_case_command __P((CASE_COM *)); |
161 | static int execute_while_command __P((WHILE_COM *)); | |
162 | static int execute_until_command __P((WHILE_COM *)); | |
163 | static int execute_while_or_until __P((WHILE_COM *, int)); | |
164 | static int execute_if_command __P((IF_COM *)); | |
95732b49 | 165 | static int execute_null_command __P((REDIRECT *, int, int, int)); |
f73dda09 JA |
166 | static void fix_assignment_words __P((WORD_LIST *)); |
167 | static int execute_simple_command __P((SIMPLE_COM *, int, int, int, struct fd_bitmap *)); | |
168 | static int execute_builtin __P((sh_builtin_func_t *, WORD_LIST *, int, int)); | |
169 | static int execute_function __P((SHELL_VAR *, WORD_LIST *, int, struct fd_bitmap *, int, int)); | |
170 | static int execute_builtin_or_function __P((WORD_LIST *, sh_builtin_func_t *, | |
171 | SHELL_VAR *, | |
172 | REDIRECT *, struct fd_bitmap *, int)); | |
173 | static void execute_subshell_builtin_or_function __P((WORD_LIST *, REDIRECT *, | |
174 | sh_builtin_func_t *, | |
175 | SHELL_VAR *, | |
176 | int, int, int, | |
177 | struct fd_bitmap *, | |
178 | int)); | |
495aee44 | 179 | static int execute_disk_command __P((WORD_LIST *, REDIRECT *, char *, |
f73dda09 JA |
180 | int, int, int, struct fd_bitmap *, int)); |
181 | ||
182 | static char *getinterp __P((char *, int, int *)); | |
183 | static void initialize_subshell __P((void)); | |
184 | static int execute_in_subshell __P((COMMAND *, int, int, int, struct fd_bitmap *)); | |
3185942a | 185 | #if defined (COPROCESS_SUPPORT) |
d233b485 | 186 | static void coproc_setstatus __P((struct coproc *, int)); |
3185942a JA |
187 | static int execute_coproc __P((COMMAND *, int, int, struct fd_bitmap *)); |
188 | #endif | |
f73dda09 JA |
189 | |
190 | static int execute_pipeline __P((COMMAND *, int, int, int, struct fd_bitmap *)); | |
191 | ||
192 | static int execute_connection __P((COMMAND *, int, int, int, struct fd_bitmap *)); | |
193 | ||
ac50fbac | 194 | static int execute_intern_function __P((WORD_DESC *, FUNCTION_DEF *)); |
f73dda09 | 195 | |
d166f048 JA |
196 | /* Set to 1 if fd 0 was the subject of redirection to a subshell. Global |
197 | so that reader_loop can set it to zero before executing a command. */ | |
198 | int stdin_redir; | |
726f6388 JA |
199 | |
200 | /* The name of the command that is currently being executed. | |
201 | `test' needs this, for example. */ | |
202 | char *this_command_name; | |
203 | ||
b80f6443 JA |
204 | /* The printed representation of the currently-executing command (same as |
205 | the_printed_command), except when a trap is being executed. Useful for | |
206 | a debugger to know where exactly the program is currently executing. */ | |
207 | char *the_printed_command_except_trap; | |
208 | ||
726f6388 | 209 | /* For catching RETURN in a function. */ |
ccc6cda3 | 210 | int return_catch_flag; |
726f6388 | 211 | int return_catch_value; |
ccc6cda3 | 212 | procenv_t return_catch; |
726f6388 JA |
213 | |
214 | /* The value returned by the last synchronous command. */ | |
a0c0a00f | 215 | volatile int last_command_exit_value; |
726f6388 | 216 | |
b80f6443 JA |
217 | /* Whether or not the last command (corresponding to last_command_exit_value) |
218 | was terminated by a signal, and, if so, which one. */ | |
219 | int last_command_exit_signal; | |
220 | ||
ac50fbac CR |
221 | /* Are we currently ignoring the -e option for the duration of a builtin's |
222 | execution? */ | |
223 | int builtin_ignoring_errexit = 0; | |
224 | ||
726f6388 JA |
225 | /* The list of redirections to perform which will undo the redirections |
226 | that I made in the shell. */ | |
227 | REDIRECT *redirection_undo_list = (REDIRECT *)NULL; | |
228 | ||
229 | /* The list of redirections to perform which will undo the internal | |
230 | redirections performed by the `exec' builtin. These are redirections | |
231 | that must be undone even when exec discards redirection_undo_list. */ | |
232 | REDIRECT *exec_redirection_undo_list = (REDIRECT *)NULL; | |
233 | ||
3185942a JA |
234 | /* When greater than zero, value is the `level' of builtins we are |
235 | currently executing (e.g. `eval echo a' would have it set to 2). */ | |
236 | int executing_builtin = 0; | |
237 | ||
238 | /* Non-zero if we are executing a command list (a;b;c, etc.) */ | |
239 | int executing_list = 0; | |
240 | ||
241 | /* Non-zero if failing commands in a command substitution should not exit the | |
242 | shell even if -e is set. Used to pass the CMD_IGNORE_RETURN flag down to | |
243 | commands run in command substitutions by parse_and_execute. */ | |
244 | int comsub_ignore_return = 0; | |
245 | ||
726f6388 JA |
246 | /* Non-zero if we have just forked and are currently running in a subshell |
247 | environment. */ | |
ccc6cda3 JA |
248 | int subshell_environment; |
249 | ||
b80f6443 JA |
250 | /* Count of nested subshells, like SHLVL. Available via $BASH_SUBSHELL */ |
251 | int subshell_level = 0; | |
252 | ||
bb70624e JA |
253 | /* Currently-executing shell function. */ |
254 | SHELL_VAR *this_shell_function; | |
255 | ||
95732b49 JA |
256 | /* If non-zero, matches in case and [[ ... ]] are case-insensitive */ |
257 | int match_ignore_case = 0; | |
258 | ||
495aee44 CR |
259 | int executing_command_builtin = 0; |
260 | ||
3185942a JA |
261 | struct stat SB; /* used for debugging */ |
262 | ||
263 | static int special_builtin_failed; | |
264 | ||
265 | static COMMAND *currently_executing_command; | |
266 | ||
267 | /* The line number that the currently executing function starts on. */ | |
268 | static int function_line_number; | |
269 | ||
270 | /* XXX - set to 1 if we're running the DEBUG trap and we want to show the line | |
271 | number containing the function name. Used by executing_line_number to | |
272 | report the correct line number. Kind of a hack. */ | |
273 | static int showing_function_line; | |
274 | ||
d233b485 CR |
275 | static int connection_count; |
276 | ||
ac50fbac CR |
277 | /* $LINENO ($BASH_LINENO) for use by an ERR trap. Global so parse_and_execute |
278 | can save and restore it. */ | |
279 | int line_number_for_err_trap; | |
3185942a | 280 | |
0001803f | 281 | /* A sort of function nesting level counter */ |
495aee44 | 282 | int funcnest = 0; |
a0c0a00f CR |
283 | int funcnest_max = 0; |
284 | ||
d233b485 | 285 | int evalnest = 0; |
a0c0a00f CR |
286 | int evalnest_max = EVALNEST_MAX; |
287 | ||
288 | int sourcenest = 0; | |
289 | int sourcenest_max = SOURCENEST_MAX; | |
290 | ||
291 | volatile int from_return_trap = 0; | |
495aee44 CR |
292 | |
293 | int lastpipe_opt = 0; | |
0001803f | 294 | |
726f6388 JA |
295 | struct fd_bitmap *current_fds_to_close = (struct fd_bitmap *)NULL; |
296 | ||
f73dda09 | 297 | #define FD_BITMAP_DEFAULT_SIZE 32 |
d166f048 | 298 | |
726f6388 JA |
299 | /* Functions to allocate and deallocate the structures used to pass |
300 | information from the shell to its children about file descriptors | |
301 | to close. */ | |
302 | struct fd_bitmap * | |
303 | new_fd_bitmap (size) | |
f73dda09 | 304 | int size; |
726f6388 JA |
305 | { |
306 | struct fd_bitmap *ret; | |
307 | ||
308 | ret = (struct fd_bitmap *)xmalloc (sizeof (struct fd_bitmap)); | |
309 | ||
310 | ret->size = size; | |
311 | ||
312 | if (size) | |
313 | { | |
f73dda09 | 314 | ret->bitmap = (char *)xmalloc (size); |
7117c2d2 | 315 | memset (ret->bitmap, '\0', size); |
726f6388 JA |
316 | } |
317 | else | |
318 | ret->bitmap = (char *)NULL; | |
319 | return (ret); | |
320 | } | |
321 | ||
322 | void | |
323 | dispose_fd_bitmap (fdbp) | |
324 | struct fd_bitmap *fdbp; | |
325 | { | |
326 | FREE (fdbp->bitmap); | |
327 | free (fdbp); | |
328 | } | |
329 | ||
330 | void | |
331 | close_fd_bitmap (fdbp) | |
332 | struct fd_bitmap *fdbp; | |
333 | { | |
334 | register int i; | |
335 | ||
336 | if (fdbp) | |
337 | { | |
338 | for (i = 0; i < fdbp->size; i++) | |
339 | if (fdbp->bitmap[i]) | |
340 | { | |
341 | close (i); | |
342 | fdbp->bitmap[i] = 0; | |
343 | } | |
344 | } | |
345 | } | |
346 | ||
ccc6cda3 JA |
347 | /* Return the line number of the currently executing command. */ |
348 | int | |
349 | executing_line_number () | |
350 | { | |
b80f6443 JA |
351 | if (executing && showing_function_line == 0 && |
352 | (variable_context == 0 || interactive_shell == 0) && | |
353 | currently_executing_command) | |
7117c2d2 | 354 | { |
b80f6443 JA |
355 | #if defined (COND_COMMAND) |
356 | if (currently_executing_command->type == cm_cond) | |
7117c2d2 | 357 | return currently_executing_command->value.Cond->line; |
b80f6443 JA |
358 | #endif |
359 | #if defined (DPAREN_ARITHMETIC) | |
ac50fbac | 360 | if (currently_executing_command->type == cm_arith) |
7117c2d2 | 361 | return currently_executing_command->value.Arith->line; |
b80f6443 JA |
362 | #endif |
363 | #if defined (ARITH_FOR_COMMAND) | |
ac50fbac | 364 | if (currently_executing_command->type == cm_arith_for) |
7117c2d2 | 365 | return currently_executing_command->value.ArithFor->line; |
b80f6443 JA |
366 | #endif |
367 | ||
7117c2d2 JA |
368 | return line_number; |
369 | } | |
d166f048 JA |
370 | else |
371 | return line_number; | |
ccc6cda3 JA |
372 | } |
373 | ||
726f6388 JA |
374 | /* Execute the command passed in COMMAND. COMMAND is exactly what |
375 | read_command () places into GLOBAL_COMMAND. See "command.h" for the | |
376 | details of the command structure. | |
377 | ||
378 | EXECUTION_SUCCESS or EXECUTION_FAILURE are the only possible | |
379 | return values. Executing a command with nothing in it returns | |
380 | EXECUTION_SUCCESS. */ | |
ccc6cda3 | 381 | int |
726f6388 JA |
382 | execute_command (command) |
383 | COMMAND *command; | |
384 | { | |
385 | struct fd_bitmap *bitmap; | |
386 | int result; | |
387 | ||
388 | current_fds_to_close = (struct fd_bitmap *)NULL; | |
389 | bitmap = new_fd_bitmap (FD_BITMAP_DEFAULT_SIZE); | |
390 | begin_unwind_frame ("execute-command"); | |
391 | add_unwind_protect (dispose_fd_bitmap, (char *)bitmap); | |
392 | ||
393 | /* Just do the command, but not asynchronously. */ | |
394 | result = execute_command_internal (command, 0, NO_PIPE, NO_PIPE, bitmap); | |
395 | ||
396 | dispose_fd_bitmap (bitmap); | |
397 | discard_unwind_frame ("execute-command"); | |
398 | ||
399 | #if defined (PROCESS_SUBSTITUTION) | |
bb70624e JA |
400 | /* don't unlink fifos if we're in a shell function; wait until the function |
401 | returns. */ | |
d233b485 | 402 | if (variable_context == 0 && executing_list == 0) |
bb70624e | 403 | unlink_fifo_list (); |
726f6388 JA |
404 | #endif /* PROCESS_SUBSTITUTION */ |
405 | ||
0628567a | 406 | QUIT; |
726f6388 JA |
407 | return (result); |
408 | } | |
409 | ||
410 | /* Return 1 if TYPE is a shell control structure type. */ | |
411 | static int | |
412 | shell_control_structure (type) | |
413 | enum command_type type; | |
414 | { | |
415 | switch (type) | |
416 | { | |
bb70624e JA |
417 | #if defined (ARITH_FOR_COMMAND) |
418 | case cm_arith_for: | |
419 | #endif | |
726f6388 JA |
420 | #if defined (SELECT_COMMAND) |
421 | case cm_select: | |
cce855bc JA |
422 | #endif |
423 | #if defined (DPAREN_ARITHMETIC) | |
424 | case cm_arith: | |
425 | #endif | |
426 | #if defined (COND_COMMAND) | |
427 | case cm_cond: | |
726f6388 JA |
428 | #endif |
429 | case cm_case: | |
430 | case cm_while: | |
431 | case cm_until: | |
432 | case cm_if: | |
95732b49 | 433 | case cm_for: |
726f6388 | 434 | case cm_group: |
95732b49 | 435 | case cm_function_def: |
726f6388 JA |
436 | return (1); |
437 | ||
438 | default: | |
439 | return (0); | |
440 | } | |
441 | } | |
442 | ||
443 | /* A function to use to unwind_protect the redirection undo list | |
444 | for loops. */ | |
445 | static void | |
446 | cleanup_redirects (list) | |
447 | REDIRECT *list; | |
448 | { | |
b80f6443 | 449 | do_redirections (list, RX_ACTIVE); |
726f6388 JA |
450 | dispose_redirects (list); |
451 | } | |
452 | ||
d233b485 CR |
453 | void |
454 | undo_partial_redirects () | |
455 | { | |
456 | if (redirection_undo_list) | |
457 | { | |
458 | cleanup_redirects (redirection_undo_list); | |
459 | redirection_undo_list = (REDIRECT *)NULL; | |
460 | } | |
461 | } | |
462 | ||
ccc6cda3 | 463 | #if 0 |
726f6388 JA |
464 | /* Function to unwind_protect the redirections for functions and builtins. */ |
465 | static void | |
466 | cleanup_func_redirects (list) | |
467 | REDIRECT *list; | |
468 | { | |
b80f6443 | 469 | do_redirections (list, RX_ACTIVE); |
726f6388 | 470 | } |
ccc6cda3 | 471 | #endif |
726f6388 | 472 | |
cce855bc | 473 | void |
726f6388 JA |
474 | dispose_exec_redirects () |
475 | { | |
476 | if (exec_redirection_undo_list) | |
477 | { | |
478 | dispose_redirects (exec_redirection_undo_list); | |
479 | exec_redirection_undo_list = (REDIRECT *)NULL; | |
480 | } | |
481 | } | |
482 | ||
d233b485 CR |
483 | void |
484 | dispose_partial_redirects () | |
485 | { | |
486 | if (redirection_undo_list) | |
487 | { | |
488 | dispose_redirects (redirection_undo_list); | |
489 | redirection_undo_list = (REDIRECT *)NULL; | |
490 | } | |
491 | } | |
492 | ||
726f6388 JA |
493 | #if defined (JOB_CONTROL) |
494 | /* A function to restore the signal mask to its proper value when the shell | |
495 | is interrupted or errors occur while creating a pipeline. */ | |
496 | static int | |
497 | restore_signal_mask (set) | |
f73dda09 | 498 | sigset_t *set; |
726f6388 | 499 | { |
f73dda09 | 500 | return (sigprocmask (SIG_SETMASK, set, (sigset_t *)NULL)); |
726f6388 JA |
501 | } |
502 | #endif /* JOB_CONTROL */ | |
503 | ||
f73dda09 | 504 | #ifdef DEBUG |
726f6388 JA |
505 | /* A debugging function that can be called from gdb, for instance. */ |
506 | void | |
507 | open_files () | |
508 | { | |
509 | register int i; | |
510 | int f, fd_table_size; | |
511 | ||
512 | fd_table_size = getdtablesize (); | |
513 | ||
f73dda09 | 514 | fprintf (stderr, "pid %ld open files:", (long)getpid ()); |
726f6388 JA |
515 | for (i = 3; i < fd_table_size; i++) |
516 | { | |
517 | if ((f = fcntl (i, F_GETFD, 0)) != -1) | |
518 | fprintf (stderr, " %d (%s)", i, f ? "close" : "open"); | |
519 | } | |
520 | fprintf (stderr, "\n"); | |
521 | } | |
f73dda09 | 522 | #endif |
726f6388 | 523 | |
d166f048 JA |
524 | static void |
525 | async_redirect_stdin () | |
526 | { | |
527 | int fd; | |
528 | ||
529 | fd = open ("/dev/null", O_RDONLY); | |
530 | if (fd > 0) | |
531 | { | |
532 | dup2 (fd, 0); | |
533 | close (fd); | |
534 | } | |
535 | else if (fd < 0) | |
b80f6443 | 536 | internal_error (_("cannot redirect standard input from /dev/null: %s"), strerror (errno)); |
d166f048 JA |
537 | } |
538 | ||
ccc6cda3 | 539 | #define DESCRIBE_PID(pid) do { if (interactive) describe_pid (pid); } while (0) |
726f6388 | 540 | |
ac50fbac | 541 | /* Execute the command passed in COMMAND, perhaps doing it asynchronously. |
726f6388 JA |
542 | COMMAND is exactly what read_command () places into GLOBAL_COMMAND. |
543 | ASYNCHROUNOUS, if non-zero, says to do this command in the background. | |
544 | PIPE_IN and PIPE_OUT are file descriptors saying where input comes | |
545 | from and where it goes. They can have the value of NO_PIPE, which means | |
546 | I/O is stdin/stdout. | |
547 | FDS_TO_CLOSE is a list of file descriptors to close once the child has | |
548 | been forked. This list often contains the unusable sides of pipes, etc. | |
549 | ||
550 | EXECUTION_SUCCESS or EXECUTION_FAILURE are the only possible | |
551 | return values. Executing a command with nothing in it returns | |
552 | EXECUTION_SUCCESS. */ | |
ccc6cda3 JA |
553 | int |
554 | execute_command_internal (command, asynchronous, pipe_in, pipe_out, | |
726f6388 JA |
555 | fds_to_close) |
556 | COMMAND *command; | |
557 | int asynchronous; | |
558 | int pipe_in, pipe_out; | |
559 | struct fd_bitmap *fds_to_close; | |
560 | { | |
17345e5a | 561 | int exec_result, user_subshell, invert, ignore_return, was_error_trap; |
d166f048 | 562 | REDIRECT *my_undo_list, *exec_undo_list; |
ac50fbac | 563 | char *tcmd; |
b80f6443 | 564 | volatile int save_line_number; |
ac50fbac CR |
565 | #if defined (PROCESS_SUBSTITUTION) |
566 | volatile int ofifo, nfifo, osize, saved_fifo; | |
567 | volatile char *ofifo_list; | |
568 | #endif | |
726f6388 | 569 | |
f1be666c JA |
570 | if (breaking || continuing) |
571 | return (last_command_exit_value); | |
572 | if (command == 0 || read_but_dont_execute) | |
573 | return (EXECUTION_SUCCESS); | |
726f6388 | 574 | |
0628567a | 575 | QUIT; |
726f6388 JA |
576 | run_pending_traps (); |
577 | ||
b80f6443 | 578 | #if 0 |
ccc6cda3 | 579 | if (running_trap == 0) |
b80f6443 | 580 | #endif |
ccc6cda3 JA |
581 | currently_executing_command = command; |
582 | ||
726f6388 | 583 | invert = (command->flags & CMD_INVERT_RETURN) != 0; |
d166f048 JA |
584 | |
585 | /* If we're inverting the return value and `set -e' has been executed, | |
586 | we don't want a failing command to inadvertently cause the shell | |
587 | to exit. */ | |
588 | if (exit_immediately_on_error && invert) /* XXX */ | |
589 | command->flags |= CMD_IGNORE_RETURN; /* XXX */ | |
590 | ||
ccc6cda3 | 591 | exec_result = EXECUTION_SUCCESS; |
726f6388 JA |
592 | |
593 | /* If a command was being explicitly run in a subshell, or if it is | |
594 | a shell control-structure, and it has a pipe, then we do the command | |
595 | in a subshell. */ | |
bb70624e JA |
596 | if (command->type == cm_subshell && (command->flags & CMD_NO_FORK)) |
597 | return (execute_in_subshell (command, asynchronous, pipe_in, pipe_out, fds_to_close)); | |
726f6388 | 598 | |
3185942a JA |
599 | #if defined (COPROCESS_SUPPORT) |
600 | if (command->type == cm_coproc) | |
d233b485 | 601 | return (last_command_exit_value = execute_coproc (command, pipe_in, pipe_out, fds_to_close)); |
3185942a JA |
602 | #endif |
603 | ||
17345e5a JA |
604 | user_subshell = command->type == cm_subshell || ((command->flags & CMD_WANT_SUBSHELL) != 0); |
605 | ||
d233b485 CR |
606 | #if defined (TIME_BEFORE_SUBSHELL) |
607 | if ((command->flags & CMD_TIME_PIPELINE) && user_subshell && asynchronous == 0) | |
608 | { | |
609 | command->flags |= CMD_FORCE_SUBSHELL; | |
610 | exec_result = time_command (command, asynchronous, pipe_in, pipe_out, fds_to_close); | |
611 | currently_executing_command = (COMMAND *)NULL; | |
612 | return (exec_result); | |
613 | } | |
614 | #endif | |
615 | ||
bb70624e JA |
616 | if (command->type == cm_subshell || |
617 | (command->flags & (CMD_WANT_SUBSHELL|CMD_FORCE_SUBSHELL)) || | |
726f6388 JA |
618 | (shell_control_structure (command->type) && |
619 | (pipe_out != NO_PIPE || pipe_in != NO_PIPE || asynchronous))) | |
620 | { | |
621 | pid_t paren_pid; | |
ac50fbac | 622 | int s; |
d233b485 | 623 | char *p; |
726f6388 JA |
624 | |
625 | /* Fork a subshell, turn off the subshell bit, turn off job | |
626 | control and call execute_command () on the command again. */ | |
d233b485 CR |
627 | if (command->type == cm_subshell) |
628 | line_number_for_err_trap = line_number = command->value.Subshell->line; /* XXX - save value? */ | |
629 | /* Otherwise we defer setting line_number */ | |
ac50fbac | 630 | tcmd = make_command_string (command); |
d233b485 | 631 | paren_pid = make_child (p = savestring (tcmd), asynchronous); |
ac50fbac CR |
632 | |
633 | if (user_subshell && signal_is_trapped (ERROR_TRAP) && | |
634 | signal_in_progress (DEBUG_TRAP) == 0 && running_trap == 0) | |
635 | { | |
636 | FREE (the_printed_command_except_trap); | |
637 | the_printed_command_except_trap = savestring (the_printed_command); | |
638 | } | |
639 | ||
726f6388 | 640 | if (paren_pid == 0) |
ac50fbac | 641 | { |
d233b485 CR |
642 | #if defined (JOB_CONTROL) |
643 | FREE (p); /* child doesn't use pointer */ | |
644 | #endif | |
ac50fbac CR |
645 | /* We want to run the exit trap for forced {} subshells, and we |
646 | want to note this before execute_in_subshell modifies the | |
647 | COMMAND struct. Need to keep in mind that execute_in_subshell | |
648 | runs the exit trap for () subshells itself. */ | |
649 | /* This handles { command; } & */ | |
650 | s = user_subshell == 0 && command->type == cm_group && pipe_in == NO_PIPE && pipe_out == NO_PIPE && asynchronous; | |
651 | /* run exit trap for : | { ...; } and { ...; } | : */ | |
652 | /* run exit trap for : | ( ...; ) and ( ...; ) | : */ | |
653 | s += user_subshell == 0 && command->type == cm_group && (pipe_in != NO_PIPE || pipe_out != NO_PIPE) && asynchronous == 0; | |
654 | ||
655 | last_command_exit_value = execute_in_subshell (command, asynchronous, pipe_in, pipe_out, fds_to_close); | |
656 | if (s) | |
657 | subshell_exit (last_command_exit_value); | |
658 | else | |
a0c0a00f | 659 | sh_exit (last_command_exit_value); |
ac50fbac CR |
660 | /* NOTREACHED */ |
661 | } | |
726f6388 JA |
662 | else |
663 | { | |
664 | close_pipes (pipe_in, pipe_out); | |
665 | ||
666 | #if defined (PROCESS_SUBSTITUTION) && defined (HAVE_DEV_FD) | |
ac50fbac CR |
667 | if (variable_context == 0) /* wait until shell function completes */ |
668 | unlink_fifo_list (); | |
726f6388 JA |
669 | #endif |
670 | /* If we are part of a pipeline, and not the end of the pipeline, | |
671 | then we should simply return and let the last command in the | |
672 | pipe be waited for. If we are not in a pipeline, or are the | |
ccc6cda3 | 673 | last command in the pipeline, then we wait for the subshell |
726f6388 JA |
674 | and return its exit status as usual. */ |
675 | if (pipe_out != NO_PIPE) | |
676 | return (EXECUTION_SUCCESS); | |
677 | ||
678 | stop_pipeline (asynchronous, (COMMAND *)NULL); | |
679 | ||
ccc6cda3 | 680 | if (asynchronous == 0) |
726f6388 | 681 | { |
17345e5a JA |
682 | was_error_trap = signal_is_trapped (ERROR_TRAP) && signal_is_ignored (ERROR_TRAP) == 0; |
683 | invert = (command->flags & CMD_INVERT_RETURN) != 0; | |
684 | ignore_return = (command->flags & CMD_IGNORE_RETURN) != 0; | |
685 | ||
495aee44 | 686 | exec_result = wait_for (paren_pid); |
726f6388 JA |
687 | |
688 | /* If we have to, invert the return value. */ | |
689 | if (invert) | |
495aee44 | 690 | exec_result = ((exec_result == EXECUTION_SUCCESS) |
bb70624e JA |
691 | ? EXECUTION_FAILURE |
692 | : EXECUTION_SUCCESS); | |
bb70624e | 693 | |
495aee44 | 694 | last_command_exit_value = exec_result; |
17345e5a JA |
695 | if (user_subshell && was_error_trap && ignore_return == 0 && invert == 0 && exec_result != EXECUTION_SUCCESS) |
696 | { | |
89a92869 CR |
697 | save_line_number = line_number; |
698 | line_number = line_number_for_err_trap; | |
17345e5a | 699 | run_error_trap (); |
89a92869 | 700 | line_number = save_line_number; |
17345e5a JA |
701 | } |
702 | ||
703 | if (user_subshell && ignore_return == 0 && invert == 0 && exit_immediately_on_error && exec_result != EXECUTION_SUCCESS) | |
704 | { | |
17345e5a JA |
705 | run_pending_traps (); |
706 | jump_to_top_level (ERREXIT); | |
707 | } | |
708 | ||
495aee44 | 709 | return (last_command_exit_value); |
726f6388 JA |
710 | } |
711 | else | |
712 | { | |
713 | DESCRIBE_PID (paren_pid); | |
714 | ||
715 | run_pending_traps (); | |
716 | ||
ac50fbac CR |
717 | /* Posix 2013 2.9.3.1: "the exit status of an asynchronous list |
718 | shall be zero." */ | |
719 | last_command_exit_value = 0; | |
726f6388 JA |
720 | return (EXECUTION_SUCCESS); |
721 | } | |
722 | } | |
723 | } | |
724 | ||
d166f048 JA |
725 | #if defined (COMMAND_TIMING) |
726 | if (command->flags & CMD_TIME_PIPELINE) | |
727 | { | |
728 | if (asynchronous) | |
729 | { | |
730 | command->flags |= CMD_FORCE_SUBSHELL; | |
731 | exec_result = execute_command_internal (command, 1, pipe_in, pipe_out, fds_to_close); | |
732 | } | |
733 | else | |
734 | { | |
735 | exec_result = time_command (command, asynchronous, pipe_in, pipe_out, fds_to_close); | |
b80f6443 | 736 | #if 0 |
d166f048 | 737 | if (running_trap == 0) |
b80f6443 | 738 | #endif |
d166f048 JA |
739 | currently_executing_command = (COMMAND *)NULL; |
740 | } | |
741 | return (exec_result); | |
742 | } | |
743 | #endif /* COMMAND_TIMING */ | |
744 | ||
745 | if (shell_control_structure (command->type) && command->redirects) | |
746 | stdin_redir = stdin_redirects (command->redirects); | |
747 | ||
ac50fbac | 748 | #if defined (PROCESS_SUBSTITUTION) |
d233b485 CR |
749 | # if !defined (HAVE_DEV_FD) |
750 | reap_procsubs (); | |
751 | # endif | |
752 | ||
753 | if (variable_context != 0) /* XXX - also if sourcelevel != 0? */ | |
ac50fbac CR |
754 | { |
755 | ofifo = num_fifos (); | |
756 | ofifo_list = copy_fifo_list ((int *)&osize); | |
2fb21d75 CR |
757 | begin_unwind_frame ("internal_fifos"); |
758 | add_unwind_protect (xfree, ofifo_list); | |
ac50fbac CR |
759 | saved_fifo = 1; |
760 | } | |
761 | else | |
762 | saved_fifo = 0; | |
763 | #endif | |
764 | ||
726f6388 JA |
765 | /* Handle WHILE FOR CASE etc. with redirections. (Also '&' input |
766 | redirection.) */ | |
b80f6443 | 767 | if (do_redirections (command->redirects, RX_ACTIVE|RX_UNDOABLE) != 0) |
726f6388 | 768 | { |
d233b485 | 769 | undo_partial_redirects (); |
726f6388 | 770 | dispose_exec_redirects (); |
ac50fbac CR |
771 | #if defined (PROCESS_SUBSTITUTION) |
772 | if (saved_fifo) | |
d233b485 | 773 | { |
2fb21d75 | 774 | free ((void *)ofifo_list); |
d233b485 CR |
775 | discard_unwind_frame ("internal_fifos"); |
776 | } | |
ac50fbac | 777 | #endif |
f1be666c | 778 | return (last_command_exit_value = EXECUTION_FAILURE); |
726f6388 JA |
779 | } |
780 | ||
d233b485 | 781 | #if 0 |
726f6388 JA |
782 | if (redirection_undo_list) |
783 | { | |
495aee44 | 784 | /* XXX - why copy here? */ |
726f6388 | 785 | my_undo_list = (REDIRECT *)copy_redirects (redirection_undo_list); |
d233b485 | 786 | dispose_partial_redirects (); |
726f6388 JA |
787 | } |
788 | else | |
789 | my_undo_list = (REDIRECT *)NULL; | |
d233b485 CR |
790 | #else |
791 | my_undo_list = redirection_undo_list; | |
792 | redirection_undo_list = (REDIRECT *)NULL; | |
793 | #endif | |
726f6388 | 794 | |
d233b485 | 795 | #if 0 |
726f6388 JA |
796 | if (exec_redirection_undo_list) |
797 | { | |
495aee44 | 798 | /* XXX - why copy here? */ |
726f6388 | 799 | exec_undo_list = (REDIRECT *)copy_redirects (exec_redirection_undo_list); |
d233b485 | 800 | dispose_exec_redirects (); |
726f6388 JA |
801 | } |
802 | else | |
803 | exec_undo_list = (REDIRECT *)NULL; | |
d233b485 CR |
804 | #else |
805 | exec_undo_list = exec_redirection_undo_list; | |
806 | exec_redirection_undo_list = (REDIRECT *)NULL; | |
807 | #endif | |
726f6388 JA |
808 | |
809 | if (my_undo_list || exec_undo_list) | |
810 | begin_unwind_frame ("loop_redirections"); | |
811 | ||
812 | if (my_undo_list) | |
813 | add_unwind_protect ((Function *)cleanup_redirects, my_undo_list); | |
814 | ||
815 | if (exec_undo_list) | |
816 | add_unwind_protect ((Function *)dispose_redirects, exec_undo_list); | |
817 | ||
818 | ignore_return = (command->flags & CMD_IGNORE_RETURN) != 0; | |
819 | ||
820 | QUIT; | |
821 | ||
822 | switch (command->type) | |
823 | { | |
ccc6cda3 JA |
824 | case cm_simple: |
825 | { | |
b80f6443 JA |
826 | save_line_number = line_number; |
827 | /* We can't rely on variables retaining their values across a | |
ccc6cda3 JA |
828 | call to execute_simple_command if a longjmp occurs as the |
829 | result of a `return' builtin. This is true for sure with gcc. */ | |
95732b49 JA |
830 | #if defined (RECYCLES_PIDS) |
831 | last_made_pid = NO_PID; | |
832 | #endif | |
f73dda09 | 833 | was_error_trap = signal_is_trapped (ERROR_TRAP) && signal_is_ignored (ERROR_TRAP) == 0; |
ccc6cda3 JA |
834 | |
835 | if (ignore_return && command->value.Simple) | |
836 | command->value.Simple->flags |= CMD_IGNORE_RETURN; | |
d166f048 JA |
837 | if (command->flags & CMD_STDIN_REDIR) |
838 | command->value.Simple->flags |= CMD_STDIN_REDIR; | |
b80f6443 | 839 | |
0628567a | 840 | line_number_for_err_trap = line_number = command->value.Simple->line; |
ccc6cda3 JA |
841 | exec_result = |
842 | execute_simple_command (command->value.Simple, pipe_in, pipe_out, | |
843 | asynchronous, fds_to_close); | |
b80f6443 | 844 | line_number = save_line_number; |
ccc6cda3 JA |
845 | |
846 | /* The temporary environment should be used for only the simple | |
847 | command immediately following its definition. */ | |
848 | dispose_used_env_vars (); | |
849 | ||
850 | #if (defined (ultrix) && defined (mips)) || defined (C_ALLOCA) | |
851 | /* Reclaim memory allocated with alloca () on machines which | |
852 | may be using the alloca emulation code. */ | |
853 | (void) alloca (0); | |
854 | #endif /* (ultrix && mips) || C_ALLOCA */ | |
855 | ||
856 | /* If we forked to do the command, then we must wait_for () | |
857 | the child. */ | |
858 | ||
859 | /* XXX - this is something to watch out for if there are problems | |
ac50fbac CR |
860 | when the shell is compiled without job control. Don't worry about |
861 | whether or not last_made_pid == last_pid; already_making_children | |
862 | tells us whether or not there are unwaited-for children to wait | |
863 | for and reap. */ | |
864 | if (already_making_children && pipe_out == NO_PIPE) | |
ccc6cda3 JA |
865 | { |
866 | stop_pipeline (asynchronous, (COMMAND *)NULL); | |
867 | ||
868 | if (asynchronous) | |
869 | { | |
870 | DESCRIBE_PID (last_made_pid); | |
a0c0a00f CR |
871 | exec_result = EXECUTION_SUCCESS; |
872 | invert = 0; /* async commands always succeed */ | |
ccc6cda3 JA |
873 | } |
874 | else | |
875 | #if !defined (JOB_CONTROL) | |
876 | /* Do not wait for asynchronous processes started from | |
877 | startup files. */ | |
a0c0a00f CR |
878 | if (last_made_pid != NO_PID && last_made_pid != last_asynchronous_pid) |
879 | #else | |
880 | if (last_made_pid != NO_PID) | |
ccc6cda3 JA |
881 | #endif |
882 | /* When executing a shell function that executes other | |
883 | commands, this causes the last simple command in | |
b80f6443 JA |
884 | the function to be waited for twice. This also causes |
885 | subshells forked to execute builtin commands (e.g., in | |
886 | pipelines) to be waited for twice. */ | |
ccc6cda3 JA |
887 | exec_result = wait_for (last_made_pid); |
888 | } | |
889 | } | |
890 | ||
17345e5a | 891 | /* 2009/02/13 -- pipeline failure is processed elsewhere. This handles |
d233b485 CR |
892 | only the failure of a simple command. We don't want to run the error |
893 | trap if the command run by the `command' builtin fails; we want to | |
894 | defer that until the command builtin itself returns failure. */ | |
895 | if (was_error_trap && ignore_return == 0 && invert == 0 && | |
896 | pipe_in == NO_PIPE && pipe_out == NO_PIPE && | |
897 | (command->value.Simple->flags & CMD_COMMAND_BUILTIN) == 0 && | |
898 | exec_result != EXECUTION_SUCCESS) | |
f73dda09 JA |
899 | { |
900 | last_command_exit_value = exec_result; | |
89a92869 | 901 | line_number = line_number_for_err_trap; |
f73dda09 | 902 | run_error_trap (); |
89a92869 | 903 | line_number = save_line_number; |
f73dda09 JA |
904 | } |
905 | ||
ccc6cda3 | 906 | if (ignore_return == 0 && invert == 0 && |
cce855bc | 907 | ((posixly_correct && interactive == 0 && special_builtin_failed) || |
3185942a | 908 | (exit_immediately_on_error && pipe_in == NO_PIPE && pipe_out == NO_PIPE && exec_result != EXECUTION_SUCCESS))) |
ccc6cda3 JA |
909 | { |
910 | last_command_exit_value = exec_result; | |
911 | run_pending_traps (); | |
a0c0a00f CR |
912 | |
913 | /* Undo redirections before running exit trap on the way out of | |
914 | set -e. Report by Mark Farrell 5/19/2014 */ | |
915 | if (exit_immediately_on_error && signal_is_trapped (0) && | |
916 | unwind_protect_tag_on_stack ("saved-redirects")) | |
917 | run_unwind_frame ("saved-redirects"); | |
918 | ||
b80f6443 | 919 | jump_to_top_level (ERREXIT); |
ccc6cda3 JA |
920 | } |
921 | ||
922 | break; | |
923 | ||
726f6388 JA |
924 | case cm_for: |
925 | if (ignore_return) | |
926 | command->value.For->flags |= CMD_IGNORE_RETURN; | |
927 | exec_result = execute_for_command (command->value.For); | |
928 | break; | |
929 | ||
bb70624e JA |
930 | #if defined (ARITH_FOR_COMMAND) |
931 | case cm_arith_for: | |
932 | if (ignore_return) | |
933 | command->value.ArithFor->flags |= CMD_IGNORE_RETURN; | |
934 | exec_result = execute_arith_for_command (command->value.ArithFor); | |
935 | break; | |
936 | #endif | |
937 | ||
726f6388 JA |
938 | #if defined (SELECT_COMMAND) |
939 | case cm_select: | |
940 | if (ignore_return) | |
941 | command->value.Select->flags |= CMD_IGNORE_RETURN; | |
942 | exec_result = execute_select_command (command->value.Select); | |
943 | break; | |
944 | #endif | |
945 | ||
946 | case cm_case: | |
947 | if (ignore_return) | |
948 | command->value.Case->flags |= CMD_IGNORE_RETURN; | |
949 | exec_result = execute_case_command (command->value.Case); | |
950 | break; | |
951 | ||
952 | case cm_while: | |
953 | if (ignore_return) | |
954 | command->value.While->flags |= CMD_IGNORE_RETURN; | |
955 | exec_result = execute_while_command (command->value.While); | |
956 | break; | |
957 | ||
958 | case cm_until: | |
959 | if (ignore_return) | |
960 | command->value.While->flags |= CMD_IGNORE_RETURN; | |
961 | exec_result = execute_until_command (command->value.While); | |
962 | break; | |
963 | ||
964 | case cm_if: | |
965 | if (ignore_return) | |
966 | command->value.If->flags |= CMD_IGNORE_RETURN; | |
967 | exec_result = execute_if_command (command->value.If); | |
968 | break; | |
969 | ||
970 | case cm_group: | |
971 | ||
972 | /* This code can be executed from either of two paths: an explicit | |
973 | '{}' command, or via a function call. If we are executed via a | |
974 | function call, we have already taken care of the function being | |
975 | executed in the background (down there in execute_simple_command ()), | |
976 | and this command should *not* be marked as asynchronous. If we | |
977 | are executing a regular '{}' group command, and asynchronous == 1, | |
978 | we must want to execute the whole command in the background, so we | |
979 | need a subshell, and we want the stuff executed in that subshell | |
980 | (this group command) to be executed in the foreground of that | |
981 | subshell (i.e. there will not be *another* subshell forked). | |
982 | ||
983 | What we do is to force a subshell if asynchronous, and then call | |
984 | execute_command_internal again with asynchronous still set to 1, | |
985 | but with the original group command, so the printed command will | |
986 | look right. | |
987 | ||
988 | The code above that handles forking off subshells will note that | |
989 | both subshell and async are on, and turn off async in the child | |
990 | after forking the subshell (but leave async set in the parent, so | |
991 | the normal call to describe_pid is made). This turning off | |
992 | async is *crucial*; if it is not done, this will fall into an | |
993 | infinite loop of executions through this spot in subshell after | |
994 | subshell until the process limit is exhausted. */ | |
995 | ||
996 | if (asynchronous) | |
997 | { | |
998 | command->flags |= CMD_FORCE_SUBSHELL; | |
999 | exec_result = | |
1000 | execute_command_internal (command, 1, pipe_in, pipe_out, | |
1001 | fds_to_close); | |
1002 | } | |
1003 | else | |
1004 | { | |
1005 | if (ignore_return && command->value.Group->command) | |
1006 | command->value.Group->command->flags |= CMD_IGNORE_RETURN; | |
1007 | exec_result = | |
1008 | execute_command_internal (command->value.Group->command, | |
1009 | asynchronous, pipe_in, pipe_out, | |
1010 | fds_to_close); | |
1011 | } | |
1012 | break; | |
1013 | ||
ccc6cda3 JA |
1014 | case cm_connection: |
1015 | exec_result = execute_connection (command, asynchronous, | |
1016 | pipe_in, pipe_out, fds_to_close); | |
a0c0a00f CR |
1017 | if (asynchronous) |
1018 | invert = 0; /* XXX */ | |
1019 | ||
ccc6cda3 | 1020 | break; |
726f6388 | 1021 | |
cce855bc JA |
1022 | #if defined (DPAREN_ARITHMETIC) |
1023 | case cm_arith: | |
0001803f | 1024 | was_error_trap = signal_is_trapped (ERROR_TRAP) && signal_is_ignored (ERROR_TRAP) == 0; |
cce855bc JA |
1025 | if (ignore_return) |
1026 | command->value.Arith->flags |= CMD_IGNORE_RETURN; | |
0001803f | 1027 | line_number_for_err_trap = save_line_number = line_number; |
cce855bc | 1028 | exec_result = execute_arith_command (command->value.Arith); |
0001803f CR |
1029 | line_number = save_line_number; |
1030 | ||
1031 | if (was_error_trap && ignore_return == 0 && invert == 0 && exec_result != EXECUTION_SUCCESS) | |
1032 | { | |
1033 | last_command_exit_value = exec_result; | |
1034 | save_line_number = line_number; | |
1035 | line_number = line_number_for_err_trap; | |
1036 | run_error_trap (); | |
1037 | line_number = save_line_number; | |
1038 | } | |
1039 | ||
1040 | if (ignore_return == 0 && invert == 0 && exit_immediately_on_error && exec_result != EXECUTION_SUCCESS) | |
1041 | { | |
1042 | last_command_exit_value = exec_result; | |
1043 | run_pending_traps (); | |
1044 | jump_to_top_level (ERREXIT); | |
1045 | } | |
1046 | ||
cce855bc JA |
1047 | break; |
1048 | #endif | |
1049 | ||
1050 | #if defined (COND_COMMAND) | |
1051 | case cm_cond: | |
0001803f | 1052 | was_error_trap = signal_is_trapped (ERROR_TRAP) && signal_is_ignored (ERROR_TRAP) == 0; |
cce855bc JA |
1053 | if (ignore_return) |
1054 | command->value.Cond->flags |= CMD_IGNORE_RETURN; | |
0001803f CR |
1055 | |
1056 | line_number_for_err_trap = save_line_number = line_number; | |
cce855bc | 1057 | exec_result = execute_cond_command (command->value.Cond); |
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 JA |
1076 | break; |
1077 | #endif | |
1078 | ||
ccc6cda3 JA |
1079 | case cm_function_def: |
1080 | exec_result = execute_intern_function (command->value.Function_def->name, | |
ac50fbac | 1081 | command->value.Function_def); |
ccc6cda3 | 1082 | break; |
726f6388 | 1083 | |
ccc6cda3 | 1084 | default: |
b72432fd | 1085 | command_error ("execute_command", CMDERR_BADTYPE, command->type, 0); |
ccc6cda3 | 1086 | } |
726f6388 | 1087 | |
ccc6cda3 | 1088 | if (my_undo_list) |
d233b485 | 1089 | cleanup_redirects (my_undo_list); |
726f6388 | 1090 | |
ccc6cda3 JA |
1091 | if (exec_undo_list) |
1092 | dispose_redirects (exec_undo_list); | |
726f6388 | 1093 | |
ccc6cda3 JA |
1094 | if (my_undo_list || exec_undo_list) |
1095 | discard_unwind_frame ("loop_redirections"); | |
726f6388 | 1096 | |
ac50fbac CR |
1097 | #if defined (PROCESS_SUBSTITUTION) |
1098 | if (saved_fifo) | |
1099 | { | |
1100 | nfifo = num_fifos (); | |
1101 | if (nfifo > ofifo) | |
1102 | close_new_fifos ((char *)ofifo_list, osize); | |
1103 | free ((void *)ofifo_list); | |
2fb21d75 | 1104 | discard_unwind_frame ("internal_fifos"); |
ac50fbac CR |
1105 | } |
1106 | #endif | |
1107 | ||
ccc6cda3 JA |
1108 | /* Invert the return value if we have to */ |
1109 | if (invert) | |
1110 | exec_result = (exec_result == EXECUTION_SUCCESS) | |
1111 | ? EXECUTION_FAILURE | |
1112 | : EXECUTION_SUCCESS; | |
726f6388 | 1113 | |
0628567a JA |
1114 | #if defined (DPAREN_ARITHMETIC) || defined (COND_COMMAND) |
1115 | /* This is where we set PIPESTATUS from the exit status of the appropriate | |
1116 | compound commands (the ones that look enough like simple commands to | |
1117 | cause confusion). We might be able to optimize by not doing this if | |
1118 | subshell_environment != 0. */ | |
1119 | switch (command->type) | |
1120 | { | |
1121 | # if defined (DPAREN_ARITHMETIC) | |
1122 | case cm_arith: | |
1123 | # endif | |
1124 | # if defined (COND_COMMAND) | |
1125 | case cm_cond: | |
1126 | # endif | |
1127 | set_pipestatus_from_exit (exec_result); | |
1128 | break; | |
d233b485 CR |
1129 | default: |
1130 | break; | |
0628567a JA |
1131 | } |
1132 | #endif | |
1133 | ||
ccc6cda3 JA |
1134 | last_command_exit_value = exec_result; |
1135 | run_pending_traps (); | |
b80f6443 | 1136 | #if 0 |
ccc6cda3 | 1137 | if (running_trap == 0) |
b80f6443 | 1138 | #endif |
ccc6cda3 | 1139 | currently_executing_command = (COMMAND *)NULL; |
ac50fbac | 1140 | |
ccc6cda3 JA |
1141 | return (last_command_exit_value); |
1142 | } | |
726f6388 | 1143 | |
ccc6cda3 | 1144 | #if defined (COMMAND_TIMING) |
726f6388 | 1145 | |
bb70624e | 1146 | #if defined (HAVE_GETRUSAGE) && defined (HAVE_GETTIMEOFDAY) |
f73dda09 JA |
1147 | extern struct timeval *difftimeval __P((struct timeval *, struct timeval *, struct timeval *)); |
1148 | extern struct timeval *addtimeval __P((struct timeval *, struct timeval *, struct timeval *)); | |
1149 | extern int timeval_to_cpu __P((struct timeval *, struct timeval *, struct timeval *)); | |
bb70624e | 1150 | #endif |
726f6388 | 1151 | |
ccc6cda3 JA |
1152 | #define POSIX_TIMEFORMAT "real %2R\nuser %2U\nsys %2S" |
1153 | #define BASH_TIMEFORMAT "\nreal\t%3lR\nuser\t%3lU\nsys\t%3lS" | |
726f6388 | 1154 | |
3185942a | 1155 | static const int precs[] = { 0, 100, 10, 1 }; |
726f6388 | 1156 | |
ccc6cda3 JA |
1157 | /* Expand one `%'-prefixed escape sequence from a time format string. */ |
1158 | static int | |
1159 | mkfmt (buf, prec, lng, sec, sec_fraction) | |
1160 | char *buf; | |
1161 | int prec, lng; | |
f73dda09 | 1162 | time_t sec; |
ccc6cda3 JA |
1163 | int sec_fraction; |
1164 | { | |
f73dda09 JA |
1165 | time_t min; |
1166 | char abuf[INT_STRLEN_BOUND(time_t) + 1]; | |
ccc6cda3 | 1167 | int ind, aind; |
726f6388 | 1168 | |
ccc6cda3 | 1169 | ind = 0; |
f73dda09 | 1170 | abuf[sizeof(abuf) - 1] = '\0'; |
726f6388 | 1171 | |
ccc6cda3 JA |
1172 | /* If LNG is non-zero, we want to decompose SEC into minutes and seconds. */ |
1173 | if (lng) | |
1174 | { | |
1175 | min = sec / 60; | |
1176 | sec %= 60; | |
f73dda09 | 1177 | aind = sizeof(abuf) - 2; |
ccc6cda3 JA |
1178 | do |
1179 | abuf[aind--] = (min % 10) + '0'; | |
1180 | while (min /= 10); | |
1181 | aind++; | |
1182 | while (abuf[aind]) | |
cce855bc | 1183 | buf[ind++] = abuf[aind++]; |
ccc6cda3 JA |
1184 | buf[ind++] = 'm'; |
1185 | } | |
726f6388 | 1186 | |
ccc6cda3 | 1187 | /* Now add the seconds. */ |
f73dda09 | 1188 | aind = sizeof (abuf) - 2; |
ccc6cda3 JA |
1189 | do |
1190 | abuf[aind--] = (sec % 10) + '0'; | |
1191 | while (sec /= 10); | |
1192 | aind++; | |
1193 | while (abuf[aind]) | |
1194 | buf[ind++] = abuf[aind++]; | |
1195 | ||
1196 | /* We want to add a decimal point and PREC places after it if PREC is | |
1197 | nonzero. PREC is not greater than 3. SEC_FRACTION is between 0 | |
1198 | and 999. */ | |
1199 | if (prec != 0) | |
1200 | { | |
d233b485 | 1201 | buf[ind++] = locale_decpoint (); |
ccc6cda3 JA |
1202 | for (aind = 1; aind <= prec; aind++) |
1203 | { | |
1204 | buf[ind++] = (sec_fraction / precs[aind]) + '0'; | |
1205 | sec_fraction %= precs[aind]; | |
1206 | } | |
1207 | } | |
726f6388 | 1208 | |
ccc6cda3 JA |
1209 | if (lng) |
1210 | buf[ind++] = 's'; | |
1211 | buf[ind] = '\0'; | |
726f6388 | 1212 | |
ccc6cda3 JA |
1213 | return (ind); |
1214 | } | |
726f6388 | 1215 | |
ccc6cda3 JA |
1216 | /* Interpret the format string FORMAT, interpolating the following escape |
1217 | sequences: | |
7117c2d2 | 1218 | %[prec][l][RUS] |
ccc6cda3 JA |
1219 | |
1220 | where the optional `prec' is a precision, meaning the number of | |
1221 | characters after the decimal point, the optional `l' means to format | |
1222 | using minutes and seconds (MMmNN[.FF]s), like the `times' builtin', | |
1223 | and the last character is one of | |
1224 | ||
7117c2d2 JA |
1225 | R number of seconds of `real' time |
1226 | U number of seconds of `user' time | |
1227 | S number of seconds of `system' time | |
ccc6cda3 JA |
1228 | |
1229 | An occurrence of `%%' in the format string is translated to a `%'. The | |
1230 | result is printed to FP, a pointer to a FILE. The other variables are | |
1231 | the seconds and thousandths of a second of real, user, and system time, | |
1232 | resectively. */ | |
1233 | static void | |
1234 | print_formatted_time (fp, format, rs, rsf, us, usf, ss, ssf, cpu) | |
1235 | FILE *fp; | |
1236 | char *format; | |
f73dda09 JA |
1237 | time_t rs; |
1238 | int rsf; | |
1239 | time_t us; | |
1240 | int usf; | |
1241 | time_t ss; | |
1242 | int ssf, cpu; | |
ccc6cda3 JA |
1243 | { |
1244 | int prec, lng, len; | |
f73dda09 JA |
1245 | char *str, *s, ts[INT_STRLEN_BOUND (time_t) + sizeof ("mSS.FFFF")]; |
1246 | time_t sum; | |
e8ce775d | 1247 | int sum_frac; |
ccc6cda3 | 1248 | int sindex, ssize; |
726f6388 | 1249 | |
ccc6cda3 JA |
1250 | len = strlen (format); |
1251 | ssize = (len + 64) - (len % 64); | |
f73dda09 | 1252 | str = (char *)xmalloc (ssize); |
ccc6cda3 JA |
1253 | sindex = 0; |
1254 | ||
1255 | for (s = format; *s; s++) | |
1256 | { | |
1257 | if (*s != '%' || s[1] == '\0') | |
cce855bc JA |
1258 | { |
1259 | RESIZE_MALLOCED_BUFFER (str, sindex, 1, ssize, 64); | |
1260 | str[sindex++] = *s; | |
1261 | } | |
ccc6cda3 | 1262 | else if (s[1] == '%') |
cce855bc JA |
1263 | { |
1264 | s++; | |
1265 | RESIZE_MALLOCED_BUFFER (str, sindex, 1, ssize, 64); | |
1266 | str[sindex++] = *s; | |
1267 | } | |
ccc6cda3 JA |
1268 | else if (s[1] == 'P') |
1269 | { | |
1270 | s++; | |
17345e5a JA |
1271 | #if 0 |
1272 | /* clamp CPU usage at 100% */ | |
ccc6cda3 JA |
1273 | if (cpu > 10000) |
1274 | cpu = 10000; | |
17345e5a | 1275 | #endif |
ccc6cda3 JA |
1276 | sum = cpu / 100; |
1277 | sum_frac = (cpu % 100) * 10; | |
1278 | len = mkfmt (ts, 2, 0, sum, sum_frac); | |
1279 | RESIZE_MALLOCED_BUFFER (str, sindex, len, ssize, 64); | |
1280 | strcpy (str + sindex, ts); | |
1281 | sindex += len; | |
1282 | } | |
1283 | else | |
1284 | { | |
1285 | prec = 3; /* default is three places past the decimal point. */ | |
1286 | lng = 0; /* default is to not use minutes or append `s' */ | |
1287 | s++; | |
f73dda09 | 1288 | if (DIGIT (*s)) /* `precision' */ |
726f6388 | 1289 | { |
ccc6cda3 JA |
1290 | prec = *s++ - '0'; |
1291 | if (prec > 3) prec = 3; | |
726f6388 | 1292 | } |
ccc6cda3 JA |
1293 | if (*s == 'l') /* `length extender' */ |
1294 | { | |
1295 | lng = 1; | |
1296 | s++; | |
1297 | } | |
1298 | if (*s == 'R' || *s == 'E') | |
1299 | len = mkfmt (ts, prec, lng, rs, rsf); | |
1300 | else if (*s == 'U') | |
1301 | len = mkfmt (ts, prec, lng, us, usf); | |
1302 | else if (*s == 'S') | |
1303 | len = mkfmt (ts, prec, lng, ss, ssf); | |
1304 | else | |
1305 | { | |
b80f6443 | 1306 | internal_error (_("TIMEFORMAT: `%c': invalid format character"), *s); |
ccc6cda3 JA |
1307 | free (str); |
1308 | return; | |
1309 | } | |
1310 | RESIZE_MALLOCED_BUFFER (str, sindex, len, ssize, 64); | |
1311 | strcpy (str + sindex, ts); | |
1312 | sindex += len; | |
1313 | } | |
1314 | } | |
1315 | ||
1316 | str[sindex] = '\0'; | |
1317 | fprintf (fp, "%s\n", str); | |
1318 | fflush (fp); | |
1319 | ||
1320 | free (str); | |
1321 | } | |
1322 | ||
1323 | static int | |
1324 | time_command (command, asynchronous, pipe_in, pipe_out, fds_to_close) | |
1325 | COMMAND *command; | |
1326 | int asynchronous, pipe_in, pipe_out; | |
1327 | struct fd_bitmap *fds_to_close; | |
1328 | { | |
a0c0a00f | 1329 | int rv, posix_time, old_flags, nullcmd, code; |
f73dda09 | 1330 | time_t rs, us, ss; |
ccc6cda3 JA |
1331 | int rsf, usf, ssf; |
1332 | int cpu; | |
1333 | char *time_format; | |
a0c0a00f | 1334 | volatile procenv_t save_top_level; |
ccc6cda3 JA |
1335 | |
1336 | #if defined (HAVE_GETRUSAGE) && defined (HAVE_GETTIMEOFDAY) | |
1337 | struct timeval real, user, sys; | |
1338 | struct timeval before, after; | |
b80f6443 JA |
1339 | # if defined (HAVE_STRUCT_TIMEZONE) |
1340 | struct timezone dtz; /* posix doesn't define this */ | |
1341 | # endif | |
ccc6cda3 JA |
1342 | struct rusage selfb, selfa, kidsb, kidsa; /* a = after, b = before */ |
1343 | #else | |
1344 | # if defined (HAVE_TIMES) | |
1345 | clock_t tbefore, tafter, real, user, sys; | |
1346 | struct tms before, after; | |
1347 | # endif | |
1348 | #endif | |
1349 | ||
1350 | #if defined (HAVE_GETRUSAGE) && defined (HAVE_GETTIMEOFDAY) | |
b80f6443 | 1351 | # if defined (HAVE_STRUCT_TIMEZONE) |
ccc6cda3 | 1352 | gettimeofday (&before, &dtz); |
b80f6443 JA |
1353 | # else |
1354 | gettimeofday (&before, (void *)NULL); | |
1355 | # endif /* !HAVE_STRUCT_TIMEZONE */ | |
ccc6cda3 JA |
1356 | getrusage (RUSAGE_SELF, &selfb); |
1357 | getrusage (RUSAGE_CHILDREN, &kidsb); | |
1358 | #else | |
1359 | # if defined (HAVE_TIMES) | |
1360 | tbefore = times (&before); | |
1361 | # endif | |
1362 | #endif | |
1363 | ||
ac50fbac | 1364 | posix_time = command && (command->flags & CMD_TIME_POSIX); |
ccc6cda3 | 1365 | |
495aee44 CR |
1366 | nullcmd = (command == 0) || (command->type == cm_simple && command->value.Simple->words == 0 && command->value.Simple->redirects == 0); |
1367 | if (posixly_correct && nullcmd) | |
1368 | { | |
1369 | #if defined (HAVE_GETRUSAGE) | |
1370 | selfb.ru_utime.tv_sec = kidsb.ru_utime.tv_sec = selfb.ru_stime.tv_sec = kidsb.ru_stime.tv_sec = 0; | |
1371 | selfb.ru_utime.tv_usec = kidsb.ru_utime.tv_usec = selfb.ru_stime.tv_usec = kidsb.ru_stime.tv_usec = 0; | |
1372 | before.tv_sec = shell_start_time; | |
1373 | before.tv_usec = 0; | |
1374 | #else | |
1375 | before.tms_utime = before.tms_stime = before.tms_cutime = before.tms_cstime = 0; | |
1376 | tbefore = shell_start_time; | |
1377 | #endif | |
1378 | } | |
1379 | ||
d166f048 | 1380 | old_flags = command->flags; |
a0c0a00f | 1381 | COPY_PROCENV (top_level, save_top_level); |
ccc6cda3 | 1382 | command->flags &= ~(CMD_TIME_PIPELINE|CMD_TIME_POSIX); |
a0c0a00f CR |
1383 | code = setjmp_nosigs (top_level); |
1384 | if (code == NOT_JUMPED) | |
d233b485 CR |
1385 | { |
1386 | rv = execute_command_internal (command, asynchronous, pipe_in, pipe_out, fds_to_close); | |
1387 | command->flags = old_flags; | |
1388 | } | |
a0c0a00f | 1389 | COPY_PROCENV (save_top_level, top_level); |
ccc6cda3 | 1390 | |
f73dda09 | 1391 | rs = us = ss = 0; |
cce855bc JA |
1392 | rsf = usf = ssf = cpu = 0; |
1393 | ||
ccc6cda3 | 1394 | #if defined (HAVE_GETRUSAGE) && defined (HAVE_GETTIMEOFDAY) |
b80f6443 | 1395 | # if defined (HAVE_STRUCT_TIMEZONE) |
ccc6cda3 | 1396 | gettimeofday (&after, &dtz); |
b80f6443 JA |
1397 | # else |
1398 | gettimeofday (&after, (void *)NULL); | |
1399 | # endif /* !HAVE_STRUCT_TIMEZONE */ | |
ccc6cda3 JA |
1400 | getrusage (RUSAGE_SELF, &selfa); |
1401 | getrusage (RUSAGE_CHILDREN, &kidsa); | |
1402 | ||
1403 | difftimeval (&real, &before, &after); | |
1404 | timeval_to_secs (&real, &rs, &rsf); | |
1405 | ||
1406 | addtimeval (&user, difftimeval(&after, &selfb.ru_utime, &selfa.ru_utime), | |
1407 | difftimeval(&before, &kidsb.ru_utime, &kidsa.ru_utime)); | |
1408 | timeval_to_secs (&user, &us, &usf); | |
1409 | ||
1410 | addtimeval (&sys, difftimeval(&after, &selfb.ru_stime, &selfa.ru_stime), | |
1411 | difftimeval(&before, &kidsb.ru_stime, &kidsa.ru_stime)); | |
1412 | timeval_to_secs (&sys, &ss, &ssf); | |
1413 | ||
1414 | cpu = timeval_to_cpu (&real, &user, &sys); | |
1415 | #else | |
1416 | # if defined (HAVE_TIMES) | |
1417 | tafter = times (&after); | |
1418 | ||
1419 | real = tafter - tbefore; | |
1420 | clock_t_to_secs (real, &rs, &rsf); | |
1421 | ||
1422 | user = (after.tms_utime - before.tms_utime) + (after.tms_cutime - before.tms_cutime); | |
1423 | clock_t_to_secs (user, &us, &usf); | |
1424 | ||
1425 | sys = (after.tms_stime - before.tms_stime) + (after.tms_cstime - before.tms_cstime); | |
1426 | clock_t_to_secs (sys, &ss, &ssf); | |
1427 | ||
d166f048 | 1428 | cpu = (real == 0) ? 0 : ((user + sys) * 10000) / real; |
ccc6cda3 JA |
1429 | |
1430 | # else | |
f73dda09 | 1431 | rs = us = ss = 0; |
ccc6cda3 JA |
1432 | rsf = usf = ssf = cpu = 0; |
1433 | # endif | |
1434 | #endif | |
1435 | ||
1436 | if (posix_time) | |
1437 | time_format = POSIX_TIMEFORMAT; | |
1438 | else if ((time_format = get_string_value ("TIMEFORMAT")) == 0) | |
495aee44 CR |
1439 | { |
1440 | if (posixly_correct && nullcmd) | |
1441 | time_format = "user\t%2lU\nsys\t%2lS"; | |
1442 | else | |
1443 | time_format = BASH_TIMEFORMAT; | |
1444 | } | |
d233b485 | 1445 | |
ccc6cda3 JA |
1446 | if (time_format && *time_format) |
1447 | print_formatted_time (stderr, time_format, rs, rsf, us, usf, ss, ssf, cpu); | |
1448 | ||
a0c0a00f CR |
1449 | if (code) |
1450 | sh_longjmp (top_level, code); | |
1451 | ||
ccc6cda3 JA |
1452 | return rv; |
1453 | } | |
1454 | #endif /* COMMAND_TIMING */ | |
1455 | ||
bb70624e | 1456 | /* Execute a command that's supposed to be in a subshell. This must be |
28ef6c31 JA |
1457 | called after make_child and we must be running in the child process. |
1458 | The caller will return or exit() immediately with the value this returns. */ | |
bb70624e JA |
1459 | static int |
1460 | execute_in_subshell (command, asynchronous, pipe_in, pipe_out, fds_to_close) | |
1461 | COMMAND *command; | |
1462 | int asynchronous; | |
1463 | int pipe_in, pipe_out; | |
1464 | struct fd_bitmap *fds_to_close; | |
1465 | { | |
d233b485 CR |
1466 | volatile int user_subshell, user_coproc, invert; |
1467 | int return_code, function_value, should_redir_stdin, ois, result; | |
495aee44 | 1468 | volatile COMMAND *tcom; |
bb70624e | 1469 | |
f73dda09 | 1470 | USE_VAR(user_subshell); |
3185942a | 1471 | USE_VAR(user_coproc); |
f73dda09 JA |
1472 | USE_VAR(invert); |
1473 | USE_VAR(tcom); | |
1474 | USE_VAR(asynchronous); | |
1475 | ||
b80f6443 | 1476 | subshell_level++; |
bb70624e JA |
1477 | should_redir_stdin = (asynchronous && (command->flags & CMD_STDIN_REDIR) && |
1478 | pipe_in == NO_PIPE && | |
1479 | stdin_redirects (command->redirects) == 0); | |
1480 | ||
28ef6c31 | 1481 | invert = (command->flags & CMD_INVERT_RETURN) != 0; |
bb70624e | 1482 | user_subshell = command->type == cm_subshell || ((command->flags & CMD_WANT_SUBSHELL) != 0); |
3185942a | 1483 | user_coproc = command->type == cm_coproc; |
28ef6c31 | 1484 | |
bb70624e JA |
1485 | command->flags &= ~(CMD_FORCE_SUBSHELL | CMD_WANT_SUBSHELL | CMD_INVERT_RETURN); |
1486 | ||
1487 | /* If a command is asynchronous in a subshell (like ( foo ) & or | |
1488 | the special case of an asynchronous GROUP command where the | |
1489 | the subshell bit is turned on down in case cm_group: below), | |
1490 | turn off `asynchronous', so that two subshells aren't spawned. | |
0628567a JA |
1491 | XXX - asynchronous used to be set to 0 in this block, but that |
1492 | means that setup_async_signals was never run. Now it's set to | |
1493 | 0 after subshell_environment is set appropriately and setup_async_signals | |
1494 | is run. | |
bb70624e JA |
1495 | |
1496 | This seems semantically correct to me. For example, | |
1497 | ( foo ) & seems to say ``do the command `foo' in a subshell | |
1498 | environment, but don't wait for that subshell to finish'', | |
1499 | and "{ foo ; bar ; } &" seems to me to be like functions or | |
1500 | builtins in the background, which executed in a subshell | |
1501 | environment. I just don't see the need to fork two subshells. */ | |
1502 | ||
1503 | /* Don't fork again, we are already in a subshell. A `doubly | |
1504 | async' shell is not interactive, however. */ | |
1505 | if (asynchronous) | |
1506 | { | |
1507 | #if defined (JOB_CONTROL) | |
1508 | /* If a construct like ( exec xxx yyy ) & is given while job | |
1509 | control is active, we want to prevent exec from putting the | |
1510 | subshell back into the original process group, carefully | |
1511 | undoing all the work we just did in make_child. */ | |
1512 | original_pgrp = -1; | |
1513 | #endif /* JOB_CONTROL */ | |
28ef6c31 | 1514 | ois = interactive_shell; |
bb70624e | 1515 | interactive_shell = 0; |
28ef6c31 JA |
1516 | /* This test is to prevent alias expansion by interactive shells that |
1517 | run `(command) &' but to allow scripts that have enabled alias | |
1518 | expansion with `shopt -s expand_alias' to continue to expand | |
1519 | aliases. */ | |
1520 | if (ois != interactive_shell) | |
1521 | expand_aliases = 0; | |
bb70624e JA |
1522 | } |
1523 | ||
1524 | /* Subshells are neither login nor interactive. */ | |
1525 | login_shell = interactive = 0; | |
1526 | ||
d233b485 CR |
1527 | /* And we're no longer in a loop. See Posix interp 842 (we are not in the |
1528 | "same execution environment"). */ | |
1529 | if (shell_compatibility_level > 44) | |
1530 | loop_level = 0; | |
1531 | ||
0628567a | 1532 | if (user_subshell) |
d233b485 CR |
1533 | { |
1534 | subshell_environment = SUBSHELL_PAREN; /* XXX */ | |
1535 | if (asynchronous) | |
1536 | subshell_environment |= SUBSHELL_ASYNC; | |
1537 | } | |
0628567a JA |
1538 | else |
1539 | { | |
1540 | subshell_environment = 0; /* XXX */ | |
1541 | if (asynchronous) | |
1542 | subshell_environment |= SUBSHELL_ASYNC; | |
1543 | if (pipe_in != NO_PIPE || pipe_out != NO_PIPE) | |
1544 | subshell_environment |= SUBSHELL_PIPE; | |
3185942a JA |
1545 | if (user_coproc) |
1546 | subshell_environment |= SUBSHELL_COPROC; | |
0628567a | 1547 | } |
bb70624e JA |
1548 | |
1549 | reset_terminating_signals (); /* in sig.c */ | |
1550 | /* Cancel traps, in trap.c. */ | |
495aee44 CR |
1551 | /* Reset the signal handlers in the child, but don't free the |
1552 | trap strings. Set a flag noting that we have to free the | |
1553 | trap strings if we run trap to change a signal disposition. */ | |
1554 | reset_signal_handlers (); | |
1555 | subshell_environment |= SUBSHELL_RESETTRAP; | |
d233b485 CR |
1556 | #if 0 /* TAG:bash-5.1 */ |
1557 | /* We are in a subshell, so forget that we are running a trap handler or | |
1558 | that the signal handler has changed (we haven't changed it!) */ | |
1559 | if (running_trap > 0) | |
1560 | { | |
1561 | run_trap_cleanup (running_trap - 1); | |
1562 | running_trap = 0; | |
1563 | } | |
1564 | #endif | |
0628567a JA |
1565 | |
1566 | /* Make sure restore_original_signals doesn't undo the work done by | |
1567 | make_child to ensure that asynchronous children are immune to SIGINT | |
1568 | and SIGQUIT. Turn off asynchronous to make sure more subshells are | |
1569 | not spawned. */ | |
bb70624e | 1570 | if (asynchronous) |
0628567a JA |
1571 | { |
1572 | setup_async_signals (); | |
1573 | asynchronous = 0; | |
1574 | } | |
d233b485 CR |
1575 | else |
1576 | set_sigint_handler (); | |
bb70624e JA |
1577 | |
1578 | #if defined (JOB_CONTROL) | |
1579 | set_sigchld_handler (); | |
1580 | #endif /* JOB_CONTROL */ | |
1581 | ||
bb70624e JA |
1582 | /* Delete all traces that there were any jobs running. This is |
1583 | only for subshells. */ | |
1584 | without_job_control (); | |
bb70624e JA |
1585 | |
1586 | if (fds_to_close) | |
1587 | close_fd_bitmap (fds_to_close); | |
1588 | ||
1589 | do_piping (pipe_in, pipe_out); | |
1590 | ||
3185942a JA |
1591 | #if defined (COPROCESS_SUPPORT) |
1592 | coproc_closeall (); | |
1593 | #endif | |
1594 | ||
bb70624e JA |
1595 | /* If this is a user subshell, set a flag if stdin was redirected. |
1596 | This is used later to decide whether to redirect fd 0 to | |
1597 | /dev/null for async commands in the subshell. This adds more | |
a0c0a00f CR |
1598 | sh compatibility, but I'm not sure it's the right thing to do. |
1599 | Note that an input pipe to a compound command suffices to inhibit | |
1600 | the implicit /dev/null redirection for asynchronous commands | |
1601 | executed as part of that compound command. */ | |
bb70624e JA |
1602 | if (user_subshell) |
1603 | { | |
a0c0a00f CR |
1604 | stdin_redir = stdin_redirects (command->redirects) || pipe_in != NO_PIPE; |
1605 | #if 0 | |
1606 | restore_default_signal (EXIT_TRAP); /* XXX - reset_signal_handlers above */ | |
1607 | #endif | |
bb70624e | 1608 | } |
a0c0a00f CR |
1609 | else if (shell_control_structure (command->type) && pipe_in != NO_PIPE) |
1610 | stdin_redir = 1; | |
bb70624e JA |
1611 | |
1612 | /* If this is an asynchronous command (command &), we want to | |
1613 | redirect the standard input from /dev/null in the absence of | |
1614 | any specific redirection involving stdin. */ | |
1615 | if (should_redir_stdin && stdin_redir == 0) | |
1616 | async_redirect_stdin (); | |
1617 | ||
d233b485 CR |
1618 | #if 0 |
1619 | /* XXX - TAG:bash-5.1 */ | |
1620 | if (user_subshell && command->type == cm_subshell) | |
1621 | optimize_subshell_command (command->value.Subshell->command); | |
1622 | #endif | |
1623 | ||
bb70624e JA |
1624 | /* Do redirections, then dispose of them before recursive call. */ |
1625 | if (command->redirects) | |
1626 | { | |
b80f6443 | 1627 | if (do_redirections (command->redirects, RX_ACTIVE) != 0) |
28ef6c31 | 1628 | exit (invert ? EXECUTION_SUCCESS : EXECUTION_FAILURE); |
bb70624e JA |
1629 | |
1630 | dispose_redirects (command->redirects); | |
1631 | command->redirects = (REDIRECT *)NULL; | |
1632 | } | |
1633 | ||
3185942a JA |
1634 | if (command->type == cm_subshell) |
1635 | tcom = command->value.Subshell->command; | |
1636 | else if (user_coproc) | |
1637 | tcom = command->value.Coproc->command; | |
1638 | else | |
1639 | tcom = command; | |
bb70624e | 1640 | |
95732b49 JA |
1641 | if (command->flags & CMD_TIME_PIPELINE) |
1642 | tcom->flags |= CMD_TIME_PIPELINE; | |
1643 | if (command->flags & CMD_TIME_POSIX) | |
1644 | tcom->flags |= CMD_TIME_POSIX; | |
1645 | ||
f73dda09 JA |
1646 | /* Make sure the subshell inherits any CMD_IGNORE_RETURN flag. */ |
1647 | if ((command->flags & CMD_IGNORE_RETURN) && tcom != command) | |
1648 | tcom->flags |= CMD_IGNORE_RETURN; | |
1649 | ||
bb70624e JA |
1650 | /* If this is a simple command, tell execute_disk_command that it |
1651 | might be able to get away without forking and simply exec. | |
1652 | This means things like ( sleep 10 ) will only cause one fork. | |
28ef6c31 JA |
1653 | If we're timing the command or inverting its return value, however, |
1654 | we cannot do this optimization. */ | |
3185942a | 1655 | if ((user_subshell || user_coproc) && (tcom->type == cm_simple || tcom->type == cm_subshell) && |
28ef6c31 JA |
1656 | ((tcom->flags & CMD_TIME_PIPELINE) == 0) && |
1657 | ((tcom->flags & CMD_INVERT_RETURN) == 0)) | |
bb70624e JA |
1658 | { |
1659 | tcom->flags |= CMD_NO_FORK; | |
1660 | if (tcom->type == cm_simple) | |
1661 | tcom->value.Simple->flags |= CMD_NO_FORK; | |
1662 | } | |
1663 | ||
28ef6c31 JA |
1664 | invert = (tcom->flags & CMD_INVERT_RETURN) != 0; |
1665 | tcom->flags &= ~CMD_INVERT_RETURN; | |
1666 | ||
ac50fbac | 1667 | result = setjmp_nosigs (top_level); |
0001803f | 1668 | |
bb70624e JA |
1669 | /* If we're inside a function while executing this subshell, we |
1670 | need to handle a possible `return'. */ | |
1671 | function_value = 0; | |
1672 | if (return_catch_flag) | |
ac50fbac | 1673 | function_value = setjmp_nosigs (return_catch); |
bb70624e | 1674 | |
0001803f CR |
1675 | /* If we're going to exit the shell, we don't want to invert the return |
1676 | status. */ | |
1677 | if (result == EXITPROG) | |
1678 | invert = 0, return_code = last_command_exit_value; | |
1679 | else if (result) | |
a0c0a00f | 1680 | return_code = (last_command_exit_value == EXECUTION_SUCCESS) ? EXECUTION_FAILURE : last_command_exit_value; |
0001803f | 1681 | else if (function_value) |
bb70624e JA |
1682 | return_code = return_catch_value; |
1683 | else | |
ac50fbac | 1684 | return_code = execute_command_internal ((COMMAND *)tcom, asynchronous, NO_PIPE, NO_PIPE, fds_to_close); |
bb70624e | 1685 | |
28ef6c31 JA |
1686 | /* If we are asked to, invert the return value. */ |
1687 | if (invert) | |
1688 | return_code = (return_code == EXECUTION_SUCCESS) ? EXECUTION_FAILURE | |
1689 | : EXECUTION_SUCCESS; | |
1690 | ||
d233b485 | 1691 | |
bb70624e JA |
1692 | /* If we were explicitly placed in a subshell with (), we need |
1693 | to do the `shell cleanup' things, such as running traps[0]. */ | |
1694 | if (user_subshell && signal_is_trapped (0)) | |
1695 | { | |
1696 | last_command_exit_value = return_code; | |
1697 | return_code = run_exit_trap (); | |
1698 | } | |
1699 | ||
a0c0a00f CR |
1700 | #if 0 |
1701 | subshell_level--; /* don't bother, caller will just exit */ | |
1702 | #endif | |
bb70624e JA |
1703 | return (return_code); |
1704 | /* NOTREACHED */ | |
1705 | } | |
1706 | ||
3185942a JA |
1707 | #if defined (COPROCESS_SUPPORT) |
1708 | #define COPROC_MAX 16 | |
1709 | ||
1710 | typedef struct cpelement | |
1711 | { | |
1712 | struct cpelement *next; | |
1713 | struct coproc *coproc; | |
1714 | } | |
1715 | cpelement_t; | |
1716 | ||
1717 | typedef struct cplist | |
1718 | { | |
1719 | struct cpelement *head; | |
1720 | struct cpelement *tail; | |
1721 | int ncoproc; | |
ac50fbac | 1722 | int lock; |
3185942a JA |
1723 | } |
1724 | cplist_t; | |
1725 | ||
1726 | static struct cpelement *cpe_alloc __P((struct coproc *)); | |
1727 | static void cpe_dispose __P((struct cpelement *)); | |
1728 | static struct cpelement *cpl_add __P((struct coproc *)); | |
1729 | static struct cpelement *cpl_delete __P((pid_t)); | |
17345e5a | 1730 | static void cpl_reap __P((void)); |
3185942a | 1731 | static void cpl_flush __P((void)); |
ac50fbac | 1732 | static void cpl_closeall __P((void)); |
3185942a | 1733 | static struct cpelement *cpl_search __P((pid_t)); |
ac50fbac | 1734 | static struct cpelement *cpl_searchbyname __P((const char *)); |
3185942a JA |
1735 | static void cpl_prune __P((void)); |
1736 | ||
ac50fbac CR |
1737 | static void coproc_free __P((struct coproc *)); |
1738 | ||
1739 | /* Will go away when there is fully-implemented support for multiple coprocs. */ | |
1740 | Coproc sh_coproc = { 0, NO_PID, -1, -1, 0, 0, 0, 0, 0 }; | |
3185942a JA |
1741 | |
1742 | cplist_t coproc_list = {0, 0, 0}; | |
1743 | ||
17345e5a | 1744 | /* Functions to manage the list of coprocs */ |
3185942a JA |
1745 | |
1746 | static struct cpelement * | |
1747 | cpe_alloc (cp) | |
1748 | Coproc *cp; | |
1749 | { | |
1750 | struct cpelement *cpe; | |
1751 | ||
1752 | cpe = (struct cpelement *)xmalloc (sizeof (struct cpelement)); | |
1753 | cpe->coproc = cp; | |
1754 | cpe->next = (struct cpelement *)0; | |
1755 | return cpe; | |
1756 | } | |
1757 | ||
1758 | static void | |
1759 | cpe_dispose (cpe) | |
1760 | struct cpelement *cpe; | |
1761 | { | |
1762 | free (cpe); | |
1763 | } | |
1764 | ||
1765 | static struct cpelement * | |
1766 | cpl_add (cp) | |
1767 | Coproc *cp; | |
1768 | { | |
1769 | struct cpelement *cpe; | |
1770 | ||
1771 | cpe = cpe_alloc (cp); | |
1772 | ||
1773 | if (coproc_list.head == 0) | |
1774 | { | |
1775 | coproc_list.head = coproc_list.tail = cpe; | |
1776 | coproc_list.ncoproc = 0; /* just to make sure */ | |
1777 | } | |
1778 | else | |
1779 | { | |
1780 | coproc_list.tail->next = cpe; | |
1781 | coproc_list.tail = cpe; | |
1782 | } | |
1783 | coproc_list.ncoproc++; | |
1784 | ||
1785 | return cpe; | |
1786 | } | |
1787 | ||
1788 | static struct cpelement * | |
1789 | cpl_delete (pid) | |
1790 | pid_t pid; | |
1791 | { | |
1792 | struct cpelement *prev, *p; | |
1793 | ||
1794 | for (prev = p = coproc_list.head; p; prev = p, p = p->next) | |
1795 | if (p->coproc->c_pid == pid) | |
1796 | { | |
1797 | prev->next = p->next; /* remove from list */ | |
1798 | break; | |
1799 | } | |
1800 | ||
1801 | if (p == 0) | |
1802 | return 0; /* not found */ | |
1803 | ||
1804 | #if defined (DEBUG) | |
1805 | itrace("cpl_delete: deleting %d", pid); | |
1806 | #endif | |
1807 | ||
1808 | /* Housekeeping in the border cases. */ | |
1809 | if (p == coproc_list.head) | |
1810 | coproc_list.head = coproc_list.head->next; | |
1811 | else if (p == coproc_list.tail) | |
1812 | coproc_list.tail = prev; | |
1813 | ||
1814 | coproc_list.ncoproc--; | |
1815 | if (coproc_list.ncoproc == 0) | |
1816 | coproc_list.head = coproc_list.tail = 0; | |
1817 | else if (coproc_list.ncoproc == 1) | |
1818 | coproc_list.tail = coproc_list.head; /* just to make sure */ | |
1819 | ||
1820 | return (p); | |
1821 | } | |
1822 | ||
17345e5a JA |
1823 | static void |
1824 | cpl_reap () | |
1825 | { | |
ac50fbac | 1826 | struct cpelement *p, *next, *nh, *nt; |
17345e5a | 1827 | |
ac50fbac CR |
1828 | /* Build a new list by removing dead coprocs and fix up the coproc_list |
1829 | pointers when done. */ | |
1830 | nh = nt = next = (struct cpelement *)0; | |
1831 | for (p = coproc_list.head; p; p = next) | |
1832 | { | |
1833 | next = p->next; | |
1834 | if (p->coproc->c_flags & COPROC_DEAD) | |
1835 | { | |
1836 | coproc_list.ncoproc--; /* keep running count, fix up pointers later */ | |
17345e5a JA |
1837 | |
1838 | #if defined (DEBUG) | |
ac50fbac | 1839 | itrace("cpl_reap: deleting %d", p->coproc->c_pid); |
17345e5a JA |
1840 | #endif |
1841 | ||
ac50fbac CR |
1842 | coproc_dispose (p->coproc); |
1843 | cpe_dispose (p); | |
1844 | } | |
1845 | else if (nh == 0) | |
1846 | nh = nt = p; | |
1847 | else | |
1848 | { | |
1849 | nt->next = p; | |
1850 | nt = nt->next; | |
1851 | } | |
1852 | } | |
1853 | ||
1854 | if (coproc_list.ncoproc == 0) | |
1855 | coproc_list.head = coproc_list.tail = 0; | |
1856 | else | |
1857 | { | |
1858 | if (nt) | |
1859 | nt->next = 0; | |
1860 | coproc_list.head = nh; | |
1861 | coproc_list.tail = nt; | |
1862 | if (coproc_list.ncoproc == 1) | |
1863 | coproc_list.tail = coproc_list.head; /* just to make sure */ | |
1864 | } | |
17345e5a JA |
1865 | } |
1866 | ||
3185942a JA |
1867 | /* Clear out the list of saved statuses */ |
1868 | static void | |
1869 | cpl_flush () | |
1870 | { | |
1871 | struct cpelement *cpe, *p; | |
1872 | ||
1873 | for (cpe = coproc_list.head; cpe; ) | |
1874 | { | |
1875 | p = cpe; | |
1876 | cpe = cpe->next; | |
1877 | ||
1878 | coproc_dispose (p->coproc); | |
1879 | cpe_dispose (p); | |
1880 | } | |
1881 | ||
1882 | coproc_list.head = coproc_list.tail = 0; | |
1883 | coproc_list.ncoproc = 0; | |
1884 | } | |
1885 | ||
ac50fbac CR |
1886 | static void |
1887 | cpl_closeall () | |
1888 | { | |
1889 | struct cpelement *cpe; | |
1890 | ||
1891 | for (cpe = coproc_list.head; cpe; cpe = cpe->next) | |
1892 | coproc_close (cpe->coproc); | |
1893 | } | |
1894 | ||
1895 | static void | |
1896 | cpl_fdchk (fd) | |
1897 | int fd; | |
1898 | { | |
1899 | struct cpelement *cpe; | |
1900 | ||
1901 | for (cpe = coproc_list.head; cpe; cpe = cpe->next) | |
1902 | coproc_checkfd (cpe->coproc, fd); | |
1903 | } | |
1904 | ||
3185942a JA |
1905 | /* Search for PID in the list of coprocs; return the cpelement struct if |
1906 | found. If not found, return NULL. */ | |
1907 | static struct cpelement * | |
1908 | cpl_search (pid) | |
1909 | pid_t pid; | |
1910 | { | |
ac50fbac | 1911 | struct cpelement *cpe; |
3185942a | 1912 | |
ac50fbac CR |
1913 | for (cpe = coproc_list.head ; cpe; cpe = cpe->next) |
1914 | if (cpe->coproc->c_pid == pid) | |
1915 | return cpe; | |
3185942a JA |
1916 | return (struct cpelement *)NULL; |
1917 | } | |
1918 | ||
1919 | /* Search for the coproc named NAME in the list of coprocs; return the | |
1920 | cpelement struct if found. If not found, return NULL. */ | |
1921 | static struct cpelement * | |
1922 | cpl_searchbyname (name) | |
ac50fbac | 1923 | const char *name; |
3185942a JA |
1924 | { |
1925 | struct cpelement *cp; | |
1926 | ||
1927 | for (cp = coproc_list.head ; cp; cp = cp->next) | |
1928 | if (STREQ (cp->coproc->c_name, name)) | |
1929 | return cp; | |
1930 | return (struct cpelement *)NULL; | |
1931 | } | |
1932 | ||
d233b485 CR |
1933 | static pid_t |
1934 | cpl_firstactive () | |
1935 | { | |
1936 | struct cpelement *cpe; | |
1937 | ||
1938 | for (cpe = coproc_list.head ; cpe; cpe = cpe->next) | |
1939 | if ((cpe->coproc->c_flags & COPROC_DEAD) == 0) | |
1940 | return cpe->coproc->c_pid; | |
1941 | return (pid_t)NO_PID; | |
1942 | } | |
1943 | ||
3185942a JA |
1944 | #if 0 |
1945 | static void | |
1946 | cpl_prune () | |
1947 | { | |
1948 | struct cpelement *cp; | |
1949 | ||
1950 | while (coproc_list.head && coproc_list.ncoproc > COPROC_MAX) | |
1951 | { | |
1952 | cp = coproc_list.head; | |
1953 | coproc_list.head = coproc_list.head->next; | |
1954 | coproc_dispose (cp->coproc); | |
1955 | cpe_dispose (cp); | |
1956 | coproc_list.ncoproc--; | |
1957 | } | |
1958 | } | |
1959 | #endif | |
1960 | ||
1961 | /* These currently use a single global "shell coproc" but are written in a | |
1962 | way to not preclude additional coprocs later (using the list management | |
1963 | package above). */ | |
1964 | ||
1965 | struct coproc * | |
1966 | getcoprocbypid (pid) | |
1967 | pid_t pid; | |
1968 | { | |
ac50fbac CR |
1969 | #if MULTIPLE_COPROCS |
1970 | struct cpelement *p; | |
1971 | ||
1972 | p = cpl_search (pid); | |
1973 | return (p ? p->coproc : 0); | |
1974 | #else | |
3185942a | 1975 | return (pid == sh_coproc.c_pid ? &sh_coproc : 0); |
ac50fbac | 1976 | #endif |
3185942a JA |
1977 | } |
1978 | ||
1979 | struct coproc * | |
1980 | getcoprocbyname (name) | |
1981 | const char *name; | |
1982 | { | |
ac50fbac CR |
1983 | #if MULTIPLE_COPROCS |
1984 | struct cpelement *p; | |
1985 | ||
1986 | p = cpl_searchbyname (name); | |
1987 | return (p ? p->coproc : 0); | |
1988 | #else | |
3185942a | 1989 | return ((sh_coproc.c_name && STREQ (sh_coproc.c_name, name)) ? &sh_coproc : 0); |
ac50fbac | 1990 | #endif |
3185942a JA |
1991 | } |
1992 | ||
1993 | void | |
1994 | coproc_init (cp) | |
1995 | struct coproc *cp; | |
1996 | { | |
1997 | cp->c_name = 0; | |
1998 | cp->c_pid = NO_PID; | |
1999 | cp->c_rfd = cp->c_wfd = -1; | |
2000 | cp->c_rsave = cp->c_wsave = -1; | |
ac50fbac | 2001 | cp->c_flags = cp->c_status = cp->c_lock = 0; |
3185942a JA |
2002 | } |
2003 | ||
2004 | struct coproc * | |
2005 | coproc_alloc (name, pid) | |
2006 | char *name; | |
2007 | pid_t pid; | |
2008 | { | |
2009 | struct coproc *cp; | |
2010 | ||
ac50fbac CR |
2011 | #if MULTIPLE_COPROCS |
2012 | cp = (struct coproc *)xmalloc (sizeof (struct coproc)); | |
2013 | #else | |
2014 | cp = &sh_coproc; | |
2015 | #endif | |
3185942a | 2016 | coproc_init (cp); |
ac50fbac | 2017 | cp->c_lock = 2; |
3185942a | 2018 | |
3185942a | 2019 | cp->c_pid = pid; |
ac50fbac CR |
2020 | cp->c_name = savestring (name); |
2021 | #if MULTIPLE_COPROCS | |
2022 | cpl_add (cp); | |
2023 | #endif | |
2024 | cp->c_lock = 0; | |
3185942a JA |
2025 | return (cp); |
2026 | } | |
2027 | ||
ac50fbac CR |
2028 | static void |
2029 | coproc_free (cp) | |
2030 | struct coproc *cp; | |
2031 | { | |
2032 | free (cp); | |
2033 | } | |
2034 | ||
3185942a JA |
2035 | void |
2036 | coproc_dispose (cp) | |
2037 | struct coproc *cp; | |
2038 | { | |
ac50fbac CR |
2039 | sigset_t set, oset; |
2040 | ||
3185942a JA |
2041 | if (cp == 0) |
2042 | return; | |
2043 | ||
ac50fbac CR |
2044 | BLOCK_SIGNAL (SIGCHLD, set, oset); |
2045 | cp->c_lock = 3; | |
3185942a JA |
2046 | coproc_unsetvars (cp); |
2047 | FREE (cp->c_name); | |
2048 | coproc_close (cp); | |
ac50fbac CR |
2049 | #if MULTIPLE_COPROCS |
2050 | coproc_free (cp); | |
2051 | #else | |
3185942a | 2052 | coproc_init (cp); |
ac50fbac CR |
2053 | cp->c_lock = 0; |
2054 | #endif | |
2055 | UNBLOCK_SIGNAL (oset); | |
3185942a JA |
2056 | } |
2057 | ||
ac50fbac | 2058 | /* Placeholder for now. Will require changes for multiple coprocs */ |
3185942a JA |
2059 | void |
2060 | coproc_flush () | |
2061 | { | |
ac50fbac CR |
2062 | #if MULTIPLE_COPROCS |
2063 | cpl_flush (); | |
2064 | #else | |
3185942a | 2065 | coproc_dispose (&sh_coproc); |
ac50fbac | 2066 | #endif |
3185942a JA |
2067 | } |
2068 | ||
2069 | void | |
2070 | coproc_close (cp) | |
2071 | struct coproc *cp; | |
2072 | { | |
2073 | if (cp->c_rfd >= 0) | |
2074 | { | |
2075 | close (cp->c_rfd); | |
2076 | cp->c_rfd = -1; | |
2077 | } | |
2078 | if (cp->c_wfd >= 0) | |
2079 | { | |
2080 | close (cp->c_wfd); | |
2081 | cp->c_wfd = -1; | |
2082 | } | |
2083 | cp->c_rsave = cp->c_wsave = -1; | |
2084 | } | |
2085 | ||
2086 | void | |
2087 | coproc_closeall () | |
2088 | { | |
ac50fbac CR |
2089 | #if MULTIPLE_COPROCS |
2090 | cpl_closeall (); | |
2091 | #else | |
2092 | coproc_close (&sh_coproc); /* XXX - will require changes for multiple coprocs */ | |
2093 | #endif | |
3185942a JA |
2094 | } |
2095 | ||
17345e5a JA |
2096 | void |
2097 | coproc_reap () | |
2098 | { | |
ac50fbac CR |
2099 | #if MULTIPLE_COPROCS |
2100 | cpl_reap (); | |
2101 | #else | |
17345e5a JA |
2102 | struct coproc *cp; |
2103 | ||
ac50fbac | 2104 | cp = &sh_coproc; /* XXX - will require changes for multiple coprocs */ |
17345e5a JA |
2105 | if (cp && (cp->c_flags & COPROC_DEAD)) |
2106 | coproc_dispose (cp); | |
ac50fbac | 2107 | #endif |
17345e5a JA |
2108 | } |
2109 | ||
3185942a JA |
2110 | void |
2111 | coproc_rclose (cp, fd) | |
2112 | struct coproc *cp; | |
2113 | int fd; | |
2114 | { | |
2115 | if (cp->c_rfd >= 0 && cp->c_rfd == fd) | |
2116 | { | |
2117 | close (cp->c_rfd); | |
2118 | cp->c_rfd = -1; | |
2119 | } | |
2120 | } | |
2121 | ||
2122 | void | |
2123 | coproc_wclose (cp, fd) | |
2124 | struct coproc *cp; | |
2125 | int fd; | |
2126 | { | |
2127 | if (cp->c_wfd >= 0 && cp->c_wfd == fd) | |
2128 | { | |
2129 | close (cp->c_wfd); | |
2130 | cp->c_wfd = -1; | |
2131 | } | |
2132 | } | |
2133 | ||
2134 | void | |
2135 | coproc_checkfd (cp, fd) | |
2136 | struct coproc *cp; | |
2137 | int fd; | |
2138 | { | |
2139 | int update; | |
2140 | ||
2141 | update = 0; | |
2142 | if (cp->c_rfd >= 0 && cp->c_rfd == fd) | |
2143 | update = cp->c_rfd = -1; | |
2144 | if (cp->c_wfd >= 0 && cp->c_wfd == fd) | |
2145 | update = cp->c_wfd = -1; | |
2146 | if (update) | |
2147 | coproc_setvars (cp); | |
2148 | } | |
2149 | ||
2150 | void | |
2151 | coproc_fdchk (fd) | |
2152 | int fd; | |
2153 | { | |
ac50fbac CR |
2154 | #if MULTIPLE_COPROCS |
2155 | cpl_fdchk (fd); | |
2156 | #else | |
3185942a | 2157 | coproc_checkfd (&sh_coproc, fd); |
ac50fbac | 2158 | #endif |
3185942a JA |
2159 | } |
2160 | ||
2161 | void | |
2162 | coproc_fdclose (cp, fd) | |
2163 | struct coproc *cp; | |
2164 | int fd; | |
2165 | { | |
2166 | coproc_rclose (cp, fd); | |
2167 | coproc_wclose (cp, fd); | |
2168 | coproc_setvars (cp); | |
2169 | } | |
2170 | ||
2171 | void | |
2172 | coproc_fdsave (cp) | |
2173 | struct coproc *cp; | |
2174 | { | |
2175 | cp->c_rsave = cp->c_rfd; | |
2176 | cp->c_wsave = cp->c_wfd; | |
2177 | } | |
2178 | ||
2179 | void | |
2180 | coproc_fdrestore (cp) | |
2181 | struct coproc *cp; | |
2182 | { | |
2183 | cp->c_rfd = cp->c_rsave; | |
2184 | cp->c_wfd = cp->c_wsave; | |
2185 | } | |
17345e5a | 2186 | |
d233b485 CR |
2187 | static void |
2188 | coproc_setstatus (cp, status) | |
2189 | struct coproc *cp; | |
2190 | int status; | |
2191 | { | |
2192 | cp->c_lock = 4; | |
2193 | cp->c_status = status; | |
2194 | cp->c_flags |= COPROC_DEAD; | |
2195 | cp->c_flags &= ~COPROC_RUNNING; | |
2196 | /* Don't dispose the coproc or unset the COPROC_XXX variables because | |
2197 | this is executed in a signal handler context. Wait until coproc_reap | |
2198 | takes care of it. */ | |
2199 | cp->c_lock = 0; | |
2200 | } | |
2201 | ||
3185942a | 2202 | void |
17345e5a | 2203 | coproc_pidchk (pid, status) |
3185942a | 2204 | pid_t pid; |
a0c0a00f | 2205 | int status; |
3185942a JA |
2206 | { |
2207 | struct coproc *cp; | |
2208 | ||
ac50fbac CR |
2209 | #if MULTIPLE_COPROCS |
2210 | struct cpelement *cpe; | |
2211 | ||
d233b485 CR |
2212 | /* We're not disposing the coproc because this is executed in a signal |
2213 | handler context */ | |
2214 | cpe = cpl_search (pid); | |
ac50fbac CR |
2215 | cp = cpe ? cpe->coproc : 0; |
2216 | #else | |
3185942a | 2217 | cp = getcoprocbypid (pid); |
3185942a JA |
2218 | #endif |
2219 | if (cp) | |
d233b485 | 2220 | coproc_setstatus (cp, status); |
3185942a JA |
2221 | } |
2222 | ||
d233b485 CR |
2223 | pid_t |
2224 | coproc_active () | |
2225 | { | |
2226 | #if MULTIPLE_COPROCS | |
2227 | return (cpl_firstactive ()); | |
2228 | #else | |
2229 | return ((sh_coproc.c_flags & COPROC_DEAD) ? NO_PID : sh_coproc.c_pid); | |
2230 | #endif | |
2231 | } | |
3185942a JA |
2232 | void |
2233 | coproc_setvars (cp) | |
2234 | struct coproc *cp; | |
2235 | { | |
2236 | SHELL_VAR *v; | |
2237 | char *namevar, *t; | |
2238 | int l; | |
a0c0a00f | 2239 | WORD_DESC w; |
3185942a JA |
2240 | #if defined (ARRAY_VARS) |
2241 | arrayind_t ind; | |
2242 | #endif | |
2243 | ||
2244 | if (cp->c_name == 0) | |
2245 | return; | |
2246 | ||
a0c0a00f CR |
2247 | /* We could do more here but right now we only check the name, warn if it's |
2248 | not a valid identifier, and refuse to create variables with invalid names | |
2249 | if a coproc with such a name is supplied. */ | |
2250 | w.word = cp->c_name; | |
2251 | w.flags = 0; | |
2252 | if (check_identifier (&w, 1) == 0) | |
2253 | return; | |
2254 | ||
3185942a JA |
2255 | l = strlen (cp->c_name); |
2256 | namevar = xmalloc (l + 16); | |
2257 | ||
2258 | #if defined (ARRAY_VARS) | |
2259 | v = find_variable (cp->c_name); | |
a0c0a00f CR |
2260 | |
2261 | /* This is the same code as in find_or_make_array_variable */ | |
2262 | if (v == 0) | |
2263 | { | |
2264 | v = find_variable_nameref_for_create (cp->c_name, 1); | |
2265 | if (v == INVALID_NAMEREF_VALUE) | |
d233b485 CR |
2266 | { |
2267 | free (namevar); | |
2268 | return; | |
2269 | } | |
a0c0a00f CR |
2270 | if (v && nameref_p (v)) |
2271 | { | |
2272 | free (cp->c_name); | |
2273 | cp->c_name = savestring (nameref_cell (v)); | |
2274 | v = make_new_array_variable (cp->c_name); | |
2275 | } | |
2276 | } | |
2277 | ||
2278 | if (v && (readonly_p (v) || noassign_p (v))) | |
2279 | { | |
2280 | if (readonly_p (v)) | |
2281 | err_readonly (cp->c_name); | |
d233b485 | 2282 | free (namevar); |
a0c0a00f CR |
2283 | return; |
2284 | } | |
3185942a JA |
2285 | if (v == 0) |
2286 | v = make_new_array_variable (cp->c_name); | |
2287 | if (array_p (v) == 0) | |
2288 | v = convert_var_to_array (v); | |
2289 | ||
2290 | t = itos (cp->c_rfd); | |
2291 | ind = 0; | |
2292 | v = bind_array_variable (cp->c_name, ind, t, 0); | |
2293 | free (t); | |
2294 | ||
2295 | t = itos (cp->c_wfd); | |
2296 | ind = 1; | |
d233b485 | 2297 | v = bind_array_variable (cp->c_name, ind, t, 0); |
3185942a JA |
2298 | free (t); |
2299 | #else | |
2300 | sprintf (namevar, "%s_READ", cp->c_name); | |
2301 | t = itos (cp->c_rfd); | |
2302 | bind_variable (namevar, t, 0); | |
2303 | free (t); | |
2304 | sprintf (namevar, "%s_WRITE", cp->c_name); | |
2305 | t = itos (cp->c_wfd); | |
2306 | bind_variable (namevar, t, 0); | |
2307 | free (t); | |
2308 | #endif | |
2309 | ||
2310 | sprintf (namevar, "%s_PID", cp->c_name); | |
2311 | t = itos (cp->c_pid); | |
d233b485 | 2312 | v = bind_variable (namevar, t, 0); |
3185942a JA |
2313 | free (t); |
2314 | ||
2315 | free (namevar); | |
2316 | } | |
2317 | ||
2318 | void | |
2319 | coproc_unsetvars (cp) | |
2320 | struct coproc *cp; | |
2321 | { | |
2322 | int l; | |
2323 | char *namevar; | |
2324 | ||
2325 | if (cp->c_name == 0) | |
2326 | return; | |
2327 | ||
2328 | l = strlen (cp->c_name); | |
2329 | namevar = xmalloc (l + 16); | |
2330 | ||
2331 | sprintf (namevar, "%s_PID", cp->c_name); | |
a0c0a00f | 2332 | unbind_variable_noref (namevar); |
3185942a JA |
2333 | |
2334 | #if defined (ARRAY_VARS) | |
a0c0a00f | 2335 | check_unbind_variable (cp->c_name); |
3185942a JA |
2336 | #else |
2337 | sprintf (namevar, "%s_READ", cp->c_name); | |
2338 | unbind_variable (namevar); | |
2339 | sprintf (namevar, "%s_WRITE", cp->c_name); | |
2340 | unbind_variable (namevar); | |
2341 | #endif | |
2342 | ||
2343 | free (namevar); | |
2344 | } | |
2345 | ||
2346 | static int | |
2347 | execute_coproc (command, pipe_in, pipe_out, fds_to_close) | |
2348 | COMMAND *command; | |
2349 | int pipe_in, pipe_out; | |
2350 | struct fd_bitmap *fds_to_close; | |
2351 | { | |
ac50fbac | 2352 | int rpipe[2], wpipe[2], estat, invert; |
3185942a JA |
2353 | pid_t coproc_pid; |
2354 | Coproc *cp; | |
d233b485 | 2355 | char *tcmd, *p, *name; |
ac50fbac | 2356 | sigset_t set, oset; |
3185942a | 2357 | |
ac50fbac CR |
2358 | /* XXX -- can be removed after changes to handle multiple coprocs */ |
2359 | #if !MULTIPLE_COPROCS | |
d233b485 | 2360 | if (sh_coproc.c_pid != NO_PID && (sh_coproc.c_rfd >= 0 || sh_coproc.c_wfd >= 0)) |
a0c0a00f | 2361 | internal_warning (_("execute_coproc: coproc [%d:%s] still exists"), sh_coproc.c_pid, sh_coproc.c_name); |
3185942a | 2362 | coproc_init (&sh_coproc); |
ac50fbac | 2363 | #endif |
3185942a | 2364 | |
ac50fbac | 2365 | invert = (command->flags & CMD_INVERT_RETURN) != 0; |
d233b485 CR |
2366 | |
2367 | /* expand name without splitting - could make this dependent on a shopt option */ | |
2368 | name = expand_string_unsplit_to_string (command->value.Coproc->name, 0); | |
2369 | /* Optional check -- could be relaxed */ | |
2370 | if (legal_identifier (name) == 0) | |
2371 | { | |
2372 | internal_error (_("`%s': not a valid identifier"), name); | |
2373 | return (invert ? EXECUTION_SUCCESS : EXECUTION_FAILURE); | |
2374 | } | |
2375 | else | |
2376 | { | |
2377 | free (command->value.Coproc->name); | |
2378 | command->value.Coproc->name = name; | |
2379 | } | |
2380 | ||
3185942a JA |
2381 | command_string_index = 0; |
2382 | tcmd = make_command_string (command); | |
2383 | ||
2384 | sh_openpipe ((int *)&rpipe); /* 0 = parent read, 1 = child write */ | |
2385 | sh_openpipe ((int *)&wpipe); /* 0 = child read, 1 = parent write */ | |
2386 | ||
ac50fbac CR |
2387 | BLOCK_SIGNAL (SIGCHLD, set, oset); |
2388 | ||
d233b485 | 2389 | coproc_pid = make_child (p = savestring (tcmd), 1); |
ac50fbac | 2390 | |
3185942a JA |
2391 | if (coproc_pid == 0) |
2392 | { | |
2393 | close (rpipe[0]); | |
2394 | close (wpipe[1]); | |
2395 | ||
d233b485 CR |
2396 | #if defined (JOB_CONTROL) |
2397 | FREE (p); | |
2398 | #endif | |
2399 | ||
ac50fbac | 2400 | UNBLOCK_SIGNAL (oset); |
0001803f CR |
2401 | estat = execute_in_subshell (command, 1, wpipe[0], rpipe[1], fds_to_close); |
2402 | ||
2403 | fflush (stdout); | |
2404 | fflush (stderr); | |
2405 | ||
2406 | exit (estat); | |
3185942a JA |
2407 | } |
2408 | ||
2409 | close (rpipe[1]); | |
2410 | close (wpipe[0]); | |
2411 | ||
2412 | cp = coproc_alloc (command->value.Coproc->name, coproc_pid); | |
2413 | cp->c_rfd = rpipe[0]; | |
2414 | cp->c_wfd = wpipe[1]; | |
2415 | ||
d233b485 CR |
2416 | cp->c_flags |= COPROC_RUNNING; |
2417 | ||
3185942a JA |
2418 | SET_CLOSE_ON_EXEC (cp->c_rfd); |
2419 | SET_CLOSE_ON_EXEC (cp->c_wfd); | |
2420 | ||
2421 | coproc_setvars (cp); | |
2422 | ||
ac50fbac CR |
2423 | UNBLOCK_SIGNAL (oset); |
2424 | ||
3185942a | 2425 | #if 0 |
d233b485 | 2426 | itrace ("execute_coproc (%s): [%d] %s", command->value.Coproc->name, coproc_pid, the_printed_command); |
3185942a JA |
2427 | #endif |
2428 | ||
2429 | close_pipes (pipe_in, pipe_out); | |
2430 | #if defined (PROCESS_SUBSTITUTION) && defined (HAVE_DEV_FD) | |
2431 | unlink_fifo_list (); | |
2432 | #endif | |
2433 | stop_pipeline (1, (COMMAND *)NULL); | |
2434 | DESCRIBE_PID (coproc_pid); | |
2435 | run_pending_traps (); | |
2436 | ||
ac50fbac | 2437 | return (invert ? EXECUTION_FAILURE : EXECUTION_SUCCESS); |
3185942a JA |
2438 | } |
2439 | #endif | |
2440 | ||
495aee44 CR |
2441 | static void |
2442 | restore_stdin (s) | |
2443 | int s; | |
2444 | { | |
2445 | dup2 (s, 0); | |
2446 | close (s); | |
2447 | } | |
2448 | ||
2449 | /* Catch-all cleanup function for lastpipe code for unwind-protects */ | |
2450 | static void | |
2451 | lastpipe_cleanup (s) | |
2452 | int s; | |
2453 | { | |
d233b485 | 2454 | set_jobs_list_frozen (s); |
495aee44 CR |
2455 | } |
2456 | ||
ccc6cda3 JA |
2457 | static int |
2458 | execute_pipeline (command, asynchronous, pipe_in, pipe_out, fds_to_close) | |
2459 | COMMAND *command; | |
2460 | int asynchronous, pipe_in, pipe_out; | |
2461 | struct fd_bitmap *fds_to_close; | |
2462 | { | |
2463 | int prev, fildes[2], new_bitmap_size, dummyfd, ignore_return, exec_result; | |
d233b485 | 2464 | int lstdin, lastpipe_flag, lastpipe_jid, old_frozen; |
ccc6cda3 JA |
2465 | COMMAND *cmd; |
2466 | struct fd_bitmap *fd_bitmap; | |
495aee44 | 2467 | pid_t lastpid; |
726f6388 JA |
2468 | |
2469 | #if defined (JOB_CONTROL) | |
ccc6cda3 JA |
2470 | sigset_t set, oset; |
2471 | BLOCK_CHILD (set, oset); | |
726f6388 JA |
2472 | #endif /* JOB_CONTROL */ |
2473 | ||
ccc6cda3 | 2474 | ignore_return = (command->flags & CMD_IGNORE_RETURN) != 0; |
726f6388 | 2475 | |
ccc6cda3 JA |
2476 | prev = pipe_in; |
2477 | cmd = command; | |
2478 | ||
2479 | while (cmd && cmd->type == cm_connection && | |
2480 | cmd->value.Connection && cmd->value.Connection->connector == '|') | |
2481 | { | |
2482 | /* Make a pipeline between the two commands. */ | |
2483 | if (pipe (fildes) < 0) | |
2484 | { | |
3185942a | 2485 | sys_error (_("pipe error")); |
726f6388 | 2486 | #if defined (JOB_CONTROL) |
ccc6cda3 JA |
2487 | terminate_current_pipeline (); |
2488 | kill_current_pipeline (); | |
95732b49 | 2489 | UNBLOCK_CHILD (oset); |
726f6388 | 2490 | #endif /* JOB_CONTROL */ |
ccc6cda3 JA |
2491 | last_command_exit_value = EXECUTION_FAILURE; |
2492 | /* The unwind-protects installed below will take care | |
2493 | of closing all of the open file descriptors. */ | |
2494 | throw_to_top_level (); | |
2495 | return (EXECUTION_FAILURE); /* XXX */ | |
2496 | } | |
2497 | ||
2498 | /* Here is a problem: with the new file close-on-exec | |
2499 | code, the read end of the pipe (fildes[0]) stays open | |
2500 | in the first process, so that process will never get a | |
2501 | SIGPIPE. There is no way to signal the first process | |
2502 | that it should close fildes[0] after forking, so it | |
2503 | remains open. No SIGPIPE is ever sent because there | |
2504 | is still a file descriptor open for reading connected | |
2505 | to the pipe. We take care of that here. This passes | |
2506 | around a bitmap of file descriptors that must be | |
2507 | closed after making a child process in execute_simple_command. */ | |
2508 | ||
2509 | /* We need fd_bitmap to be at least as big as fildes[0]. | |
2510 | If fildes[0] is less than fds_to_close->size, then | |
2511 | use fds_to_close->size. */ | |
2512 | new_bitmap_size = (fildes[0] < fds_to_close->size) | |
2513 | ? fds_to_close->size | |
2514 | : fildes[0] + 8; | |
2515 | ||
2516 | fd_bitmap = new_fd_bitmap (new_bitmap_size); | |
2517 | ||
2518 | /* Now copy the old information into the new bitmap. */ | |
2519 | xbcopy ((char *)fds_to_close->bitmap, (char *)fd_bitmap->bitmap, fds_to_close->size); | |
2520 | ||
2521 | /* And mark the pipe file descriptors to be closed. */ | |
2522 | fd_bitmap->bitmap[fildes[0]] = 1; | |
2523 | ||
2524 | /* In case there are pipe or out-of-processes errors, we | |
cce855bc | 2525 | want all these file descriptors to be closed when |
ccc6cda3 JA |
2526 | unwind-protects are run, and the storage used for the |
2527 | bitmaps freed up. */ | |
2528 | begin_unwind_frame ("pipe-file-descriptors"); | |
2529 | add_unwind_protect (dispose_fd_bitmap, fd_bitmap); | |
2530 | add_unwind_protect (close_fd_bitmap, fd_bitmap); | |
2531 | if (prev >= 0) | |
2532 | add_unwind_protect (close, prev); | |
2533 | dummyfd = fildes[1]; | |
2534 | add_unwind_protect (close, dummyfd); | |
726f6388 JA |
2535 | |
2536 | #if defined (JOB_CONTROL) | |
f73dda09 | 2537 | add_unwind_protect (restore_signal_mask, &oset); |
726f6388 JA |
2538 | #endif /* JOB_CONTROL */ |
2539 | ||
ccc6cda3 JA |
2540 | if (ignore_return && cmd->value.Connection->first) |
2541 | cmd->value.Connection->first->flags |= CMD_IGNORE_RETURN; | |
2542 | execute_command_internal (cmd->value.Connection->first, asynchronous, | |
2543 | prev, fildes[1], fd_bitmap); | |
2544 | ||
2545 | if (prev >= 0) | |
2546 | close (prev); | |
2547 | ||
2548 | prev = fildes[0]; | |
2549 | close (fildes[1]); | |
2550 | ||
2551 | dispose_fd_bitmap (fd_bitmap); | |
2552 | discard_unwind_frame ("pipe-file-descriptors"); | |
726f6388 | 2553 | |
ccc6cda3 JA |
2554 | cmd = cmd->value.Connection->second; |
2555 | } | |
2556 | ||
495aee44 CR |
2557 | lastpid = last_made_pid; |
2558 | ||
ccc6cda3 JA |
2559 | /* Now execute the rightmost command in the pipeline. */ |
2560 | if (ignore_return && cmd) | |
2561 | cmd->flags |= CMD_IGNORE_RETURN; | |
495aee44 CR |
2562 | |
2563 | lastpipe_flag = 0; | |
ac50fbac | 2564 | |
495aee44 CR |
2565 | begin_unwind_frame ("lastpipe-exec"); |
2566 | lstdin = -1; | |
2567 | /* If the `lastpipe' option is set with shopt, and job control is not | |
2568 | enabled, execute the last element of non-async pipelines in the | |
2569 | current shell environment. */ | |
2570 | if (lastpipe_opt && job_control == 0 && asynchronous == 0 && pipe_out == NO_PIPE && prev > 0) | |
2571 | { | |
72347977 | 2572 | lstdin = move_to_high_fd (0, 1, -1); |
495aee44 CR |
2573 | if (lstdin > 0) |
2574 | { | |
2575 | do_piping (prev, pipe_out); | |
2576 | prev = NO_PIPE; | |
2577 | add_unwind_protect (restore_stdin, lstdin); | |
2578 | lastpipe_flag = 1; | |
d233b485 | 2579 | old_frozen = freeze_jobs_list (); |
495aee44 | 2580 | lastpipe_jid = stop_pipeline (0, (COMMAND *)NULL); /* XXX */ |
d233b485 | 2581 | add_unwind_protect (lastpipe_cleanup, old_frozen); |
495aee44 | 2582 | } |
335de49a CR |
2583 | if (cmd) |
2584 | cmd->flags |= CMD_LASTPIPE; | |
495aee44 CR |
2585 | } |
2586 | if (prev >= 0) | |
2587 | add_unwind_protect (close, prev); | |
2588 | ||
ccc6cda3 | 2589 | exec_result = execute_command_internal (cmd, asynchronous, prev, pipe_out, fds_to_close); |
726f6388 | 2590 | |
495aee44 CR |
2591 | if (lstdin > 0) |
2592 | restore_stdin (lstdin); | |
2593 | ||
ccc6cda3 JA |
2594 | if (prev >= 0) |
2595 | close (prev); | |
726f6388 JA |
2596 | |
2597 | #if defined (JOB_CONTROL) | |
ccc6cda3 | 2598 | UNBLOCK_CHILD (oset); |
726f6388 | 2599 | #endif |
726f6388 | 2600 | |
3185942a | 2601 | QUIT; |
495aee44 CR |
2602 | |
2603 | if (lastpipe_flag) | |
2604 | { | |
2605 | #if defined (JOB_CONTROL) | |
8061f8f1 CR |
2606 | if (INVALID_JOB (lastpipe_jid) == 0) |
2607 | { | |
2608 | append_process (savestring (the_printed_command_except_trap), dollar_dollar_pid, exec_result, lastpipe_jid); | |
2609 | lstdin = wait_for (lastpid); | |
2610 | } | |
2611 | else | |
a0c0a00f | 2612 | lstdin = wait_for_single_pid (lastpid, 0); /* checks bgpids list */ |
8061f8f1 | 2613 | #else |
495aee44 | 2614 | lstdin = wait_for (lastpid); |
8061f8f1 CR |
2615 | #endif |
2616 | ||
495aee44 | 2617 | #if defined (JOB_CONTROL) |
df2c55de CR |
2618 | /* If wait_for removes the job from the jobs table, use result of last |
2619 | command as pipeline's exit status as usual. The jobs list can get | |
2620 | frozen and unfrozen at inconvenient times if there are multiple pipelines | |
2621 | running simultaneously. */ | |
2622 | if (INVALID_JOB (lastpipe_jid) == 0) | |
2623 | exec_result = job_exit_status (lastpipe_jid); | |
2624 | else if (pipefail_opt) | |
2625 | exec_result = exec_result | lstdin; /* XXX */ | |
2626 | /* otherwise we use exec_result */ | |
495aee44 | 2627 | #endif |
d233b485 CR |
2628 | |
2629 | set_jobs_list_frozen (old_frozen); | |
495aee44 CR |
2630 | } |
2631 | ||
2632 | discard_unwind_frame ("lastpipe-exec"); | |
2633 | ||
ccc6cda3 JA |
2634 | return (exec_result); |
2635 | } | |
2636 | ||
2637 | static int | |
2638 | execute_connection (command, asynchronous, pipe_in, pipe_out, fds_to_close) | |
2639 | COMMAND *command; | |
2640 | int asynchronous, pipe_in, pipe_out; | |
2641 | struct fd_bitmap *fds_to_close; | |
2642 | { | |
ccc6cda3 | 2643 | COMMAND *tc, *second; |
17345e5a | 2644 | int ignore_return, exec_result, was_error_trap, invert; |
89a92869 | 2645 | volatile int save_line_number; |
ccc6cda3 JA |
2646 | |
2647 | ignore_return = (command->flags & CMD_IGNORE_RETURN) != 0; | |
2648 | ||
2649 | switch (command->value.Connection->connector) | |
2650 | { | |
2651 | /* Do the first command asynchronously. */ | |
2652 | case '&': | |
2653 | tc = command->value.Connection->first; | |
2654 | if (tc == 0) | |
2655 | return (EXECUTION_SUCCESS); | |
2656 | ||
d166f048 | 2657 | if (ignore_return) |
ccc6cda3 | 2658 | tc->flags |= CMD_IGNORE_RETURN; |
d166f048 | 2659 | tc->flags |= CMD_AMPERSAND; |
ccc6cda3 | 2660 | |
f73dda09 JA |
2661 | /* If this shell was compiled without job control support, |
2662 | if we are currently in a subshell via `( xxx )', or if job | |
2663 | control is not active then the standard input for an | |
2664 | asynchronous command is forced to /dev/null. */ | |
ccc6cda3 | 2665 | #if defined (JOB_CONTROL) |
f73dda09 | 2666 | if ((subshell_environment || !job_control) && !stdin_redir) |
ccc6cda3 JA |
2667 | #else |
2668 | if (!stdin_redir) | |
2669 | #endif /* JOB_CONTROL */ | |
7117c2d2 | 2670 | tc->flags |= CMD_STDIN_REDIR; |
ccc6cda3 JA |
2671 | |
2672 | exec_result = execute_command_internal (tc, 1, pipe_in, pipe_out, fds_to_close); | |
3185942a | 2673 | QUIT; |
ccc6cda3 | 2674 | |
d166f048 | 2675 | if (tc->flags & CMD_STDIN_REDIR) |
7117c2d2 | 2676 | tc->flags &= ~CMD_STDIN_REDIR; |
726f6388 | 2677 | |
ccc6cda3 JA |
2678 | second = command->value.Connection->second; |
2679 | if (second) | |
2680 | { | |
2681 | if (ignore_return) | |
2682 | second->flags |= CMD_IGNORE_RETURN; | |
726f6388 | 2683 | |
ccc6cda3 JA |
2684 | exec_result = execute_command_internal (second, asynchronous, pipe_in, pipe_out, fds_to_close); |
2685 | } | |
726f6388 | 2686 | |
ccc6cda3 | 2687 | break; |
726f6388 | 2688 | |
ccc6cda3 JA |
2689 | /* Just call execute command on both sides. */ |
2690 | case ';': | |
2691 | if (ignore_return) | |
2692 | { | |
2693 | if (command->value.Connection->first) | |
2694 | command->value.Connection->first->flags |= CMD_IGNORE_RETURN; | |
2695 | if (command->value.Connection->second) | |
2696 | command->value.Connection->second->flags |= CMD_IGNORE_RETURN; | |
726f6388 | 2697 | } |
3185942a | 2698 | executing_list++; |
ccc6cda3 JA |
2699 | QUIT; |
2700 | execute_command (command->value.Connection->first); | |
2701 | QUIT; | |
2702 | exec_result = execute_command_internal (command->value.Connection->second, | |
2703 | asynchronous, pipe_in, pipe_out, | |
2704 | fds_to_close); | |
3185942a | 2705 | executing_list--; |
726f6388 JA |
2706 | break; |
2707 | ||
ccc6cda3 | 2708 | case '|': |
17345e5a JA |
2709 | was_error_trap = signal_is_trapped (ERROR_TRAP) && signal_is_ignored (ERROR_TRAP) == 0; |
2710 | invert = (command->flags & CMD_INVERT_RETURN) != 0; | |
2711 | ignore_return = (command->flags & CMD_IGNORE_RETURN) != 0; | |
2712 | ||
a0c0a00f | 2713 | line_number_for_err_trap = line_number; /* XXX - save value? */ |
ccc6cda3 | 2714 | exec_result = execute_pipeline (command, asynchronous, pipe_in, pipe_out, fds_to_close); |
17345e5a | 2715 | |
a0c0a00f CR |
2716 | if (asynchronous) |
2717 | { | |
2718 | exec_result = EXECUTION_SUCCESS; | |
2719 | invert = 0; | |
2720 | } | |
2721 | ||
17345e5a JA |
2722 | if (was_error_trap && ignore_return == 0 && invert == 0 && exec_result != EXECUTION_SUCCESS) |
2723 | { | |
2724 | last_command_exit_value = exec_result; | |
89a92869 CR |
2725 | save_line_number = line_number; |
2726 | line_number = line_number_for_err_trap; | |
17345e5a | 2727 | run_error_trap (); |
89a92869 | 2728 | line_number = save_line_number; |
17345e5a JA |
2729 | } |
2730 | ||
2731 | if (ignore_return == 0 && invert == 0 && exit_immediately_on_error && exec_result != EXECUTION_SUCCESS) | |
2732 | { | |
2733 | last_command_exit_value = exec_result; | |
2734 | run_pending_traps (); | |
2735 | jump_to_top_level (ERREXIT); | |
2736 | } | |
2737 | ||
726f6388 JA |
2738 | break; |
2739 | ||
ccc6cda3 JA |
2740 | case AND_AND: |
2741 | case OR_OR: | |
2742 | if (asynchronous) | |
2743 | { | |
2744 | /* If we have something like `a && b &' or `a || b &', run the | |
2745 | && or || stuff in a subshell. Force a subshell and just call | |
2746 | execute_command_internal again. Leave asynchronous on | |
2747 | so that we get a report from the parent shell about the | |
2748 | background job. */ | |
2749 | command->flags |= CMD_FORCE_SUBSHELL; | |
2750 | exec_result = execute_command_internal (command, 1, pipe_in, pipe_out, fds_to_close); | |
2751 | break; | |
2752 | } | |
726f6388 | 2753 | |
ccc6cda3 JA |
2754 | /* Execute the first command. If the result of that is successful |
2755 | and the connector is AND_AND, or the result is not successful | |
2756 | and the connector is OR_OR, then execute the second command, | |
2757 | otherwise return. */ | |
726f6388 | 2758 | |
3185942a | 2759 | executing_list++; |
ccc6cda3 JA |
2760 | if (command->value.Connection->first) |
2761 | command->value.Connection->first->flags |= CMD_IGNORE_RETURN; | |
726f6388 | 2762 | |
ccc6cda3 JA |
2763 | exec_result = execute_command (command->value.Connection->first); |
2764 | QUIT; | |
2765 | if (((command->value.Connection->connector == AND_AND) && | |
2766 | (exec_result == EXECUTION_SUCCESS)) || | |
2767 | ((command->value.Connection->connector == OR_OR) && | |
2768 | (exec_result != EXECUTION_SUCCESS))) | |
2769 | { | |
a0c0a00f CR |
2770 | second = command->value.Connection->second; |
2771 | if (ignore_return && second) | |
2772 | second->flags |= CMD_IGNORE_RETURN; | |
726f6388 | 2773 | |
a0c0a00f | 2774 | exec_result = execute_command (second); |
ccc6cda3 | 2775 | } |
3185942a | 2776 | executing_list--; |
ccc6cda3 JA |
2777 | break; |
2778 | ||
2779 | default: | |
b72432fd | 2780 | command_error ("execute_connection", CMDERR_BADCONN, command->value.Connection->connector, 0); |
ccc6cda3 JA |
2781 | jump_to_top_level (DISCARD); |
2782 | exec_result = EXECUTION_FAILURE; | |
726f6388 JA |
2783 | } |
2784 | ||
ccc6cda3 | 2785 | return exec_result; |
726f6388 JA |
2786 | } |
2787 | ||
a0c0a00f CR |
2788 | /* The test used to be only for interactive_shell, but we don't want to report |
2789 | job status when the shell is not interactive or when job control isn't | |
2790 | enabled. */ | |
bb70624e JA |
2791 | #define REAP() \ |
2792 | do \ | |
2793 | { \ | |
a0c0a00f | 2794 | if (job_control == 0 || interactive_shell == 0) \ |
bb70624e JA |
2795 | reap_dead_jobs (); \ |
2796 | } \ | |
2797 | while (0) | |
726f6388 JA |
2798 | |
2799 | /* Execute a FOR command. The syntax is: FOR word_desc IN word_list; | |
2800 | DO command; DONE */ | |
ccc6cda3 | 2801 | static int |
726f6388 JA |
2802 | execute_for_command (for_command) |
2803 | FOR_COM *for_command; | |
2804 | { | |
726f6388 | 2805 | register WORD_LIST *releaser, *list; |
ccc6cda3 | 2806 | SHELL_VAR *v; |
726f6388 | 2807 | char *identifier; |
b80f6443 | 2808 | int retval, save_line_number; |
ccc6cda3 | 2809 | #if 0 |
726f6388 | 2810 | SHELL_VAR *old_value = (SHELL_VAR *)NULL; /* Remember the old value of x. */ |
ccc6cda3 | 2811 | #endif |
726f6388 | 2812 | |
b80f6443 | 2813 | save_line_number = line_number; |
726f6388 | 2814 | if (check_identifier (for_command->name, 1) == 0) |
ccc6cda3 JA |
2815 | { |
2816 | if (posixly_correct && interactive_shell == 0) | |
cce855bc | 2817 | { |
3185942a | 2818 | last_command_exit_value = EX_BADUSAGE; |
b80f6443 | 2819 | jump_to_top_level (ERREXIT); |
cce855bc | 2820 | } |
ccc6cda3 JA |
2821 | return (EXECUTION_FAILURE); |
2822 | } | |
726f6388 JA |
2823 | |
2824 | loop_level++; | |
2825 | identifier = for_command->name->word; | |
2826 | ||
ac50fbac | 2827 | line_number = for_command->line; /* for expansion error messages */ |
726f6388 JA |
2828 | list = releaser = expand_words_no_vars (for_command->map_list); |
2829 | ||
2830 | begin_unwind_frame ("for"); | |
2831 | add_unwind_protect (dispose_words, releaser); | |
2832 | ||
ccc6cda3 | 2833 | #if 0 |
726f6388 JA |
2834 | if (lexical_scoping) |
2835 | { | |
2836 | old_value = copy_variable (find_variable (identifier)); | |
2837 | if (old_value) | |
2838 | add_unwind_protect (dispose_variable, old_value); | |
2839 | } | |
ccc6cda3 | 2840 | #endif |
726f6388 JA |
2841 | |
2842 | if (for_command->flags & CMD_IGNORE_RETURN) | |
2843 | for_command->action->flags |= CMD_IGNORE_RETURN; | |
2844 | ||
ccc6cda3 | 2845 | for (retval = EXECUTION_SUCCESS; list; list = list->next) |
726f6388 JA |
2846 | { |
2847 | QUIT; | |
b80f6443 JA |
2848 | |
2849 | line_number = for_command->line; | |
2850 | ||
2851 | /* Remember what this command looks like, for debugger. */ | |
2852 | command_string_index = 0; | |
2853 | print_for_command_head (for_command); | |
2854 | ||
2855 | if (echo_command_at_execute) | |
2856 | xtrace_print_for_command_head (for_command); | |
2857 | ||
95732b49 JA |
2858 | /* Save this command unless it's a trap command and we're not running |
2859 | a debug trap. */ | |
0628567a | 2860 | if (signal_in_progress (DEBUG_TRAP) == 0 && running_trap == 0) |
b80f6443 JA |
2861 | { |
2862 | FREE (the_printed_command_except_trap); | |
2863 | the_printed_command_except_trap = savestring (the_printed_command); | |
2864 | } | |
2865 | ||
2866 | retval = run_debug_trap (); | |
2867 | #if defined (DEBUGGER) | |
2868 | /* In debugging mode, if the DEBUG trap returns a non-zero status, we | |
2869 | skip the command. */ | |
2870 | if (debugging_mode && retval != EXECUTION_SUCCESS) | |
2871 | continue; | |
2872 | #endif | |
2873 | ||
ccc6cda3 | 2874 | this_command_name = (char *)NULL; |
ac50fbac | 2875 | /* XXX - special ksh93 for command index variable handling */ |
a0c0a00f | 2876 | v = find_variable_last_nameref (identifier, 1); |
ac50fbac | 2877 | if (v && nameref_p (v)) |
a0c0a00f CR |
2878 | { |
2879 | if (valid_nameref_value (list->word->word, 1) == 0) | |
2880 | { | |
2881 | sh_invalidid (list->word->word); | |
2882 | v = 0; | |
2883 | } | |
d233b485 CR |
2884 | else if (readonly_p (v)) |
2885 | err_readonly (name_cell (v)); | |
a0c0a00f | 2886 | else |
d233b485 | 2887 | v = bind_variable_value (v, list->word->word, ASS_NAMEREF); |
a0c0a00f | 2888 | } |
ac50fbac | 2889 | else |
a0c0a00f CR |
2890 | v = bind_variable (identifier, list->word->word, 0); |
2891 | ||
2892 | if (v == 0 || readonly_p (v) || noassign_p (v)) | |
ccc6cda3 | 2893 | { |
b80f6443 | 2894 | line_number = save_line_number; |
a0c0a00f | 2895 | if (v && readonly_p (v) && interactive_shell == 0 && posixly_correct) |
ccc6cda3 JA |
2896 | { |
2897 | last_command_exit_value = EXECUTION_FAILURE; | |
2898 | jump_to_top_level (FORCE_EOF); | |
2899 | } | |
2900 | else | |
2901 | { | |
b80f6443 JA |
2902 | dispose_words (releaser); |
2903 | discard_unwind_frame ("for"); | |
d166f048 | 2904 | loop_level--; |
ccc6cda3 JA |
2905 | return (EXECUTION_FAILURE); |
2906 | } | |
2907 | } | |
a0c0a00f CR |
2908 | |
2909 | if (ifsname (identifier)) | |
2910 | setifs (v); | |
2911 | ||
ccc6cda3 | 2912 | retval = execute_command (for_command->action); |
726f6388 JA |
2913 | REAP (); |
2914 | QUIT; | |
2915 | ||
2916 | if (breaking) | |
2917 | { | |
ccc6cda3 | 2918 | breaking--; |
726f6388 JA |
2919 | break; |
2920 | } | |
2921 | ||
2922 | if (continuing) | |
2923 | { | |
2924 | continuing--; | |
2925 | if (continuing) | |
2926 | break; | |
2927 | } | |
726f6388 JA |
2928 | } |
2929 | ||
2930 | loop_level--; | |
b80f6443 | 2931 | line_number = save_line_number; |
726f6388 | 2932 | |
ccc6cda3 | 2933 | #if 0 |
726f6388 JA |
2934 | if (lexical_scoping) |
2935 | { | |
2936 | if (!old_value) | |
7117c2d2 | 2937 | unbind_variable (identifier); |
726f6388 JA |
2938 | else |
2939 | { | |
2940 | SHELL_VAR *new_value; | |
2941 | ||
d233b485 | 2942 | new_value = bind_variable (identifier, value_cell (old_value), 0); |
726f6388 JA |
2943 | new_value->attributes = old_value->attributes; |
2944 | dispose_variable (old_value); | |
2945 | } | |
2946 | } | |
ccc6cda3 | 2947 | #endif |
726f6388 JA |
2948 | |
2949 | dispose_words (releaser); | |
2950 | discard_unwind_frame ("for"); | |
2951 | return (retval); | |
2952 | } | |
2953 | ||
bb70624e JA |
2954 | #if defined (ARITH_FOR_COMMAND) |
2955 | /* Execute an arithmetic for command. The syntax is | |
2956 | ||
2957 | for (( init ; step ; test )) | |
2958 | do | |
2959 | body | |
2960 | done | |
2961 | ||
2962 | The execution should be exactly equivalent to | |
2963 | ||
2964 | eval \(\( init \)\) | |
2965 | while eval \(\( test \)\) ; do | |
2966 | body; | |
2967 | eval \(\( step \)\) | |
2968 | done | |
2969 | */ | |
7117c2d2 | 2970 | static intmax_t |
bb70624e JA |
2971 | eval_arith_for_expr (l, okp) |
2972 | WORD_LIST *l; | |
2973 | int *okp; | |
2974 | { | |
2975 | WORD_LIST *new; | |
7117c2d2 | 2976 | intmax_t expresult; |
b80f6443 | 2977 | int r; |
bb70624e JA |
2978 | |
2979 | new = expand_words_no_vars (l); | |
f73dda09 JA |
2980 | if (new) |
2981 | { | |
2982 | if (echo_command_at_execute) | |
2983 | xtrace_print_arith_cmd (new); | |
7117c2d2 | 2984 | this_command_name = "(("; /* )) for expression error messages */ |
b80f6443 JA |
2985 | |
2986 | command_string_index = 0; | |
2987 | print_arith_command (new); | |
d233b485 | 2988 | if (signal_in_progress (DEBUG_TRAP) == 0 && running_trap == 0) |
95732b49 JA |
2989 | { |
2990 | FREE (the_printed_command_except_trap); | |
2991 | the_printed_command_except_trap = savestring (the_printed_command); | |
2992 | } | |
b80f6443 JA |
2993 | |
2994 | r = run_debug_trap (); | |
2995 | /* In debugging mode, if the DEBUG trap returns a non-zero status, we | |
2996 | skip the command. */ | |
2997 | #if defined (DEBUGGER) | |
2998 | if (debugging_mode == 0 || r == EXECUTION_SUCCESS) | |
d233b485 | 2999 | expresult = evalexp (new->word->word, EXP_EXPANDED, okp); |
b80f6443 JA |
3000 | else |
3001 | { | |
3002 | expresult = 0; | |
3003 | if (okp) | |
3004 | *okp = 1; | |
3005 | } | |
3006 | #else | |
d233b485 | 3007 | expresult = evalexp (new->word->word, EXP_EXPANDED, okp); |
b80f6443 | 3008 | #endif |
f73dda09 JA |
3009 | dispose_words (new); |
3010 | } | |
3011 | else | |
3012 | { | |
3013 | expresult = 0; | |
3014 | if (okp) | |
3015 | *okp = 1; | |
3016 | } | |
bb70624e JA |
3017 | return (expresult); |
3018 | } | |
3019 | ||
3020 | static int | |
3021 | execute_arith_for_command (arith_for_command) | |
3022 | ARITH_FOR_COM *arith_for_command; | |
3023 | { | |
7117c2d2 JA |
3024 | intmax_t expresult; |
3025 | int expok, body_status, arith_lineno, save_lineno; | |
bb70624e JA |
3026 | |
3027 | body_status = EXECUTION_SUCCESS; | |
3028 | loop_level++; | |
b80f6443 | 3029 | save_lineno = line_number; |
bb70624e JA |
3030 | |
3031 | if (arith_for_command->flags & CMD_IGNORE_RETURN) | |
3032 | arith_for_command->action->flags |= CMD_IGNORE_RETURN; | |
3033 | ||
3034 | this_command_name = "(("; /* )) for expression error messages */ | |
3035 | ||
7117c2d2 JA |
3036 | /* save the starting line number of the command so we can reset |
3037 | line_number before executing each expression -- for $LINENO | |
3038 | and the DEBUG trap. */ | |
b80f6443 | 3039 | line_number = arith_lineno = arith_for_command->line; |
d233b485 | 3040 | if (variable_context && interactive_shell && sourcelevel == 0) |
a0c0a00f | 3041 | { |
d233b485 CR |
3042 | /* line numbers in a function start at 1 */ |
3043 | line_number -= function_line_number - 1; | |
3044 | if (line_number <= 0) | |
3045 | line_number = 1; | |
a0c0a00f | 3046 | } |
bb70624e JA |
3047 | |
3048 | /* Evaluate the initialization expression. */ | |
3049 | expresult = eval_arith_for_expr (arith_for_command->init, &expok); | |
3050 | if (expok == 0) | |
b80f6443 JA |
3051 | { |
3052 | line_number = save_lineno; | |
3053 | return (EXECUTION_FAILURE); | |
3054 | } | |
bb70624e JA |
3055 | |
3056 | while (1) | |
3057 | { | |
3058 | /* Evaluate the test expression. */ | |
7117c2d2 | 3059 | line_number = arith_lineno; |
bb70624e | 3060 | expresult = eval_arith_for_expr (arith_for_command->test, &expok); |
7117c2d2 JA |
3061 | line_number = save_lineno; |
3062 | ||
bb70624e JA |
3063 | if (expok == 0) |
3064 | { | |
3065 | body_status = EXECUTION_FAILURE; | |
3066 | break; | |
3067 | } | |
3068 | REAP (); | |
3069 | if (expresult == 0) | |
28ef6c31 | 3070 | break; |
bb70624e JA |
3071 | |
3072 | /* Execute the body of the arithmetic for command. */ | |
3073 | QUIT; | |
3074 | body_status = execute_command (arith_for_command->action); | |
3075 | QUIT; | |
3076 | ||
3077 | /* Handle any `break' or `continue' commands executed by the body. */ | |
3078 | if (breaking) | |
3079 | { | |
3080 | breaking--; | |
3081 | break; | |
3082 | } | |
3083 | ||
3084 | if (continuing) | |
3085 | { | |
3086 | continuing--; | |
3087 | if (continuing) | |
3088 | break; | |
3089 | } | |
3090 | ||
3091 | /* Evaluate the step expression. */ | |
7117c2d2 | 3092 | line_number = arith_lineno; |
bb70624e | 3093 | expresult = eval_arith_for_expr (arith_for_command->step, &expok); |
7117c2d2 JA |
3094 | line_number = save_lineno; |
3095 | ||
bb70624e JA |
3096 | if (expok == 0) |
3097 | { | |
3098 | body_status = EXECUTION_FAILURE; | |
3099 | break; | |
3100 | } | |
3101 | } | |
3102 | ||
3103 | loop_level--; | |
b80f6443 JA |
3104 | line_number = save_lineno; |
3105 | ||
bb70624e JA |
3106 | return (body_status); |
3107 | } | |
3108 | #endif | |
3109 | ||
726f6388 JA |
3110 | #if defined (SELECT_COMMAND) |
3111 | static int LINES, COLS, tabsize; | |
3112 | ||
3113 | #define RP_SPACE ") " | |
3114 | #define RP_SPACE_LEN 2 | |
3115 | ||
3116 | /* XXX - does not handle numbers > 1000000 at all. */ | |
3117 | #define NUMBER_LEN(s) \ | |
3118 | ((s < 10) ? 1 \ | |
3119 | : ((s < 100) ? 2 \ | |
3120 | : ((s < 1000) ? 3 \ | |
3121 | : ((s < 10000) ? 4 \ | |
3122 | : ((s < 100000) ? 5 \ | |
3123 | : 6))))) | |
3124 | ||
495aee44 CR |
3125 | static int |
3126 | displen (s) | |
3127 | const char *s; | |
3128 | { | |
3129 | #if defined (HANDLE_MULTIBYTE) | |
3130 | wchar_t *wcstr; | |
ac50fbac CR |
3131 | size_t slen; |
3132 | int wclen; | |
495aee44 CR |
3133 | |
3134 | wcstr = 0; | |
3135 | slen = mbstowcs (wcstr, s, 0); | |
3136 | if (slen == -1) | |
3137 | slen = 0; | |
3138 | wcstr = (wchar_t *)xmalloc (sizeof (wchar_t) * (slen + 1)); | |
3139 | mbstowcs (wcstr, s, slen + 1); | |
3140 | wclen = wcswidth (wcstr, slen); | |
3141 | free (wcstr); | |
ac50fbac | 3142 | return (wclen < 0 ? STRLEN(s) : wclen); |
495aee44 CR |
3143 | #else |
3144 | return (STRLEN (s)); | |
3145 | #endif | |
3146 | } | |
3147 | ||
726f6388 JA |
3148 | static int |
3149 | print_index_and_element (len, ind, list) | |
3150 | int len, ind; | |
3151 | WORD_LIST *list; | |
3152 | { | |
3153 | register WORD_LIST *l; | |
3154 | register int i; | |
3155 | ||
3156 | if (list == 0) | |
3157 | return (0); | |
ccc6cda3 JA |
3158 | for (i = ind, l = list; l && --i; l = l->next) |
3159 | ; | |
ac50fbac CR |
3160 | if (l == 0) /* don't think this can happen */ |
3161 | return (0); | |
726f6388 | 3162 | fprintf (stderr, "%*d%s%s", len, ind, RP_SPACE, l->word->word); |
495aee44 | 3163 | return (displen (l->word->word)); |
726f6388 JA |
3164 | } |
3165 | ||
3166 | static void | |
3167 | indent (from, to) | |
3168 | int from, to; | |
3169 | { | |
3170 | while (from < to) | |
3171 | { | |
3172 | if ((to / tabsize) > (from / tabsize)) | |
3173 | { | |
3174 | putc ('\t', stderr); | |
3175 | from += tabsize - from % tabsize; | |
3176 | } | |
3177 | else | |
3178 | { | |
3179 | putc (' ', stderr); | |
3180 | from++; | |
3181 | } | |
3182 | } | |
3183 | } | |
3184 | ||
3185 | static void | |
3186 | print_select_list (list, list_len, max_elem_len, indices_len) | |
3187 | WORD_LIST *list; | |
3188 | int list_len, max_elem_len, indices_len; | |
3189 | { | |
3190 | int ind, row, elem_len, pos, cols, rows; | |
3191 | int first_column_indices_len, other_indices_len; | |
3192 | ||
3193 | if (list == 0) | |
3194 | { | |
3195 | putc ('\n', stderr); | |
3196 | return; | |
3197 | } | |
3198 | ||
ccc6cda3 | 3199 | cols = max_elem_len ? COLS / max_elem_len : 1; |
726f6388 JA |
3200 | if (cols == 0) |
3201 | cols = 1; | |
3202 | rows = list_len ? list_len / cols + (list_len % cols != 0) : 1; | |
3203 | cols = list_len ? list_len / rows + (list_len % rows != 0) : 1; | |
3204 | ||
3205 | if (rows == 1) | |
3206 | { | |
3207 | rows = cols; | |
3208 | cols = 1; | |
3209 | } | |
3210 | ||
3211 | first_column_indices_len = NUMBER_LEN (rows); | |
3212 | other_indices_len = indices_len; | |
3213 | ||
3214 | for (row = 0; row < rows; row++) | |
3215 | { | |
3216 | ind = row; | |
3217 | pos = 0; | |
3218 | while (1) | |
3219 | { | |
3220 | indices_len = (pos == 0) ? first_column_indices_len : other_indices_len; | |
3221 | elem_len = print_index_and_element (indices_len, ind + 1, list); | |
3222 | elem_len += indices_len + RP_SPACE_LEN; | |
3223 | ind += rows; | |
3224 | if (ind >= list_len) | |
3225 | break; | |
3226 | indent (pos + elem_len, pos + max_elem_len); | |
3227 | pos += max_elem_len; | |
3228 | } | |
3229 | putc ('\n', stderr); | |
3230 | } | |
3231 | } | |
3232 | ||
3233 | /* Print the elements of LIST, one per line, preceded by an index from 1 to | |
3234 | LIST_LEN. Then display PROMPT and wait for the user to enter a number. | |
3235 | If the number is between 1 and LIST_LEN, return that selection. If EOF | |
e8ce775d JA |
3236 | is read, return a null string. If a blank line is entered, or an invalid |
3237 | number is entered, the loop is executed again. */ | |
726f6388 | 3238 | static char * |
7117c2d2 | 3239 | select_query (list, list_len, prompt, print_menu) |
726f6388 JA |
3240 | WORD_LIST *list; |
3241 | int list_len; | |
3242 | char *prompt; | |
7117c2d2 | 3243 | int print_menu; |
726f6388 | 3244 | { |
e8ce775d | 3245 | int max_elem_len, indices_len, len; |
7117c2d2 | 3246 | intmax_t reply; |
726f6388 JA |
3247 | WORD_LIST *l; |
3248 | char *repl_string, *t; | |
3249 | ||
d233b485 | 3250 | COLS = default_columns (); |
726f6388 JA |
3251 | |
3252 | #if 0 | |
3253 | t = get_string_value ("TABSIZE"); | |
3254 | tabsize = (t && *t) ? atoi (t) : 8; | |
3255 | if (tabsize <= 0) | |
3256 | tabsize = 8; | |
3257 | #else | |
3258 | tabsize = 8; | |
3259 | #endif | |
3260 | ||
3261 | max_elem_len = 0; | |
3262 | for (l = list; l; l = l->next) | |
3263 | { | |
495aee44 | 3264 | len = displen (l->word->word); |
726f6388 | 3265 | if (len > max_elem_len) |
cce855bc | 3266 | max_elem_len = len; |
726f6388 JA |
3267 | } |
3268 | indices_len = NUMBER_LEN (list_len); | |
3269 | max_elem_len += indices_len + RP_SPACE_LEN + 2; | |
3270 | ||
3271 | while (1) | |
3272 | { | |
7117c2d2 JA |
3273 | if (print_menu) |
3274 | print_select_list (list, list_len, max_elem_len, indices_len); | |
ccc6cda3 JA |
3275 | fprintf (stderr, "%s", prompt); |
3276 | fflush (stderr); | |
726f6388 JA |
3277 | QUIT; |
3278 | ||
495aee44 | 3279 | if (read_builtin ((WORD_LIST *)NULL) != EXECUTION_SUCCESS) |
726f6388 JA |
3280 | { |
3281 | putchar ('\n'); | |
3282 | return ((char *)NULL); | |
3283 | } | |
3284 | repl_string = get_string_value ("REPLY"); | |
a0c0a00f CR |
3285 | if (repl_string == 0) |
3286 | return ((char *)NULL); | |
726f6388 | 3287 | if (*repl_string == 0) |
7117c2d2 JA |
3288 | { |
3289 | print_menu = 1; | |
3290 | continue; | |
3291 | } | |
e8ce775d | 3292 | if (legal_number (repl_string, &reply) == 0) |
cce855bc | 3293 | return ""; |
726f6388 JA |
3294 | if (reply < 1 || reply > list_len) |
3295 | return ""; | |
3296 | ||
ccc6cda3 JA |
3297 | for (l = list; l && --reply; l = l->next) |
3298 | ; | |
ac50fbac | 3299 | return (l->word->word); /* XXX - can't be null? */ |
726f6388 JA |
3300 | } |
3301 | } | |
3302 | ||
3303 | /* Execute a SELECT command. The syntax is: | |
3304 | SELECT word IN list DO command_list DONE | |
3305 | Only `break' or `return' in command_list will terminate | |
3306 | the command. */ | |
ccc6cda3 | 3307 | static int |
726f6388 JA |
3308 | execute_select_command (select_command) |
3309 | SELECT_COM *select_command; | |
3310 | { | |
3311 | WORD_LIST *releaser, *list; | |
ccc6cda3 | 3312 | SHELL_VAR *v; |
726f6388 | 3313 | char *identifier, *ps3_prompt, *selection; |
b80f6443 | 3314 | int retval, list_len, show_menu, save_line_number; |
7117c2d2 | 3315 | |
726f6388 JA |
3316 | if (check_identifier (select_command->name, 1) == 0) |
3317 | return (EXECUTION_FAILURE); | |
3318 | ||
b80f6443 JA |
3319 | save_line_number = line_number; |
3320 | line_number = select_command->line; | |
3321 | ||
3322 | command_string_index = 0; | |
3323 | print_select_command_head (select_command); | |
3324 | ||
3325 | if (echo_command_at_execute) | |
3326 | xtrace_print_select_command_head (select_command); | |
3327 | ||
0628567a | 3328 | #if 0 |
95732b49 | 3329 | if (signal_in_progress (DEBUG_TRAP) == 0 && (this_command_name == 0 || (STREQ (this_command_name, "trap") == 0))) |
0628567a JA |
3330 | #else |
3331 | if (signal_in_progress (DEBUG_TRAP) == 0 && running_trap == 0) | |
3332 | #endif | |
95732b49 JA |
3333 | { |
3334 | FREE (the_printed_command_except_trap); | |
3335 | the_printed_command_except_trap = savestring (the_printed_command); | |
3336 | } | |
b80f6443 JA |
3337 | |
3338 | retval = run_debug_trap (); | |
3339 | #if defined (DEBUGGER) | |
3340 | /* In debugging mode, if the DEBUG trap returns a non-zero status, we | |
3341 | skip the command. */ | |
3342 | if (debugging_mode && retval != EXECUTION_SUCCESS) | |
3343 | return (EXECUTION_SUCCESS); | |
3344 | #endif | |
3345 | ||
726f6388 JA |
3346 | loop_level++; |
3347 | identifier = select_command->name->word; | |
3348 | ||
3349 | /* command and arithmetic substitution, parameter and variable expansion, | |
3350 | word splitting, pathname expansion, and quote removal. */ | |
3351 | list = releaser = expand_words_no_vars (select_command->map_list); | |
3352 | list_len = list_length (list); | |
3353 | if (list == 0 || list_len == 0) | |
3354 | { | |
3355 | if (list) | |
3356 | dispose_words (list); | |
b80f6443 | 3357 | line_number = save_line_number; |
726f6388 JA |
3358 | return (EXECUTION_SUCCESS); |
3359 | } | |
3360 | ||
3361 | begin_unwind_frame ("select"); | |
3362 | add_unwind_protect (dispose_words, releaser); | |
3363 | ||
726f6388 JA |
3364 | if (select_command->flags & CMD_IGNORE_RETURN) |
3365 | select_command->action->flags |= CMD_IGNORE_RETURN; | |
3366 | ||
ccc6cda3 | 3367 | retval = EXECUTION_SUCCESS; |
7117c2d2 | 3368 | show_menu = 1; |
ccc6cda3 | 3369 | |
726f6388 JA |
3370 | while (1) |
3371 | { | |
b80f6443 | 3372 | line_number = select_command->line; |
726f6388 | 3373 | ps3_prompt = get_string_value ("PS3"); |
ccc6cda3 | 3374 | if (ps3_prompt == 0) |
726f6388 JA |
3375 | ps3_prompt = "#? "; |
3376 | ||
3377 | QUIT; | |
7117c2d2 | 3378 | selection = select_query (list, list_len, ps3_prompt, show_menu); |
726f6388 JA |
3379 | QUIT; |
3380 | if (selection == 0) | |
7117c2d2 JA |
3381 | { |
3382 | /* select_query returns EXECUTION_FAILURE if the read builtin | |
3383 | fails, so we want to return failure in this case. */ | |
3384 | retval = EXECUTION_FAILURE; | |
3385 | break; | |
3386 | } | |
ccc6cda3 | 3387 | |
95732b49 | 3388 | v = bind_variable (identifier, selection, 0); |
a0c0a00f | 3389 | if (v == 0 || readonly_p (v) || noassign_p (v)) |
ccc6cda3 | 3390 | { |
a0c0a00f | 3391 | if (v && readonly_p (v) && interactive_shell == 0 && posixly_correct) |
ccc6cda3 JA |
3392 | { |
3393 | last_command_exit_value = EXECUTION_FAILURE; | |
3394 | jump_to_top_level (FORCE_EOF); | |
3395 | } | |
3396 | else | |
3397 | { | |
b80f6443 JA |
3398 | dispose_words (releaser); |
3399 | discard_unwind_frame ("select"); | |
3400 | loop_level--; | |
3401 | line_number = save_line_number; | |
ccc6cda3 JA |
3402 | return (EXECUTION_FAILURE); |
3403 | } | |
3404 | } | |
726f6388 | 3405 | |
f73dda09 | 3406 | retval = execute_command (select_command->action); |
726f6388 JA |
3407 | |
3408 | REAP (); | |
3409 | QUIT; | |
3410 | ||
3411 | if (breaking) | |
3412 | { | |
3413 | breaking--; | |
3414 | break; | |
3415 | } | |
bb70624e JA |
3416 | |
3417 | if (continuing) | |
3418 | { | |
3419 | continuing--; | |
3420 | if (continuing) | |
3421 | break; | |
3422 | } | |
7117c2d2 JA |
3423 | |
3424 | #if defined (KSH_COMPATIBLE_SELECT) | |
3425 | show_menu = 0; | |
3426 | selection = get_string_value ("REPLY"); | |
3427 | if (selection && *selection == '\0') | |
3428 | show_menu = 1; | |
3429 | #endif | |
726f6388 JA |
3430 | } |
3431 | ||
3432 | loop_level--; | |
b80f6443 | 3433 | line_number = save_line_number; |
726f6388 | 3434 | |
b80f6443 JA |
3435 | dispose_words (releaser); |
3436 | discard_unwind_frame ("select"); | |
726f6388 JA |
3437 | return (retval); |
3438 | } | |
3439 | #endif /* SELECT_COMMAND */ | |
3440 | ||
3441 | /* Execute a CASE command. The syntax is: CASE word_desc IN pattern_list ESAC. | |
3442 | The pattern_list is a linked list of pattern clauses; each clause contains | |
3443 | some patterns to compare word_desc against, and an associated command to | |
3444 | execute. */ | |
ccc6cda3 | 3445 | static int |
726f6388 JA |
3446 | execute_case_command (case_command) |
3447 | CASE_COM *case_command; | |
3448 | { | |
3449 | register WORD_LIST *list; | |
ccc6cda3 | 3450 | WORD_LIST *wlist, *es; |
726f6388 | 3451 | PATTERN_LIST *clauses; |
ccc6cda3 | 3452 | char *word, *pattern; |
d233b485 | 3453 | int retval, match, ignore_return, save_line_number, qflags; |
b80f6443 JA |
3454 | |
3455 | save_line_number = line_number; | |
3456 | line_number = case_command->line; | |
3457 | ||
3458 | command_string_index = 0; | |
3459 | print_case_command_head (case_command); | |
3460 | ||
3461 | if (echo_command_at_execute) | |
3462 | xtrace_print_case_command_head (case_command); | |
3463 | ||
0628567a JA |
3464 | #if 0 |
3465 | if (signal_in_progress (DEBUG_TRAP) == 0 && (this_command_name == 0 || (STREQ (this_command_name, "trap") == 0))) | |
3466 | #else | |
3467 | if (signal_in_progress (DEBUG_TRAP) == 0 && running_trap == 0) | |
3468 | #endif | |
b80f6443 JA |
3469 | { |
3470 | FREE (the_printed_command_except_trap); | |
3471 | the_printed_command_except_trap = savestring (the_printed_command); | |
3472 | } | |
3473 | ||
3474 | retval = run_debug_trap(); | |
3475 | #if defined (DEBUGGER) | |
3476 | /* In debugging mode, if the DEBUG trap returns a non-zero status, we | |
3477 | skip the command. */ | |
3478 | if (debugging_mode && retval != EXECUTION_SUCCESS) | |
3479 | { | |
3480 | line_number = save_line_number; | |
3481 | return (EXECUTION_SUCCESS); | |
3482 | } | |
3483 | #endif | |
726f6388 | 3484 | |
d233b485 CR |
3485 | /* Use the same expansions (the ones POSIX specifies) as the patterns; |
3486 | dequote the resulting string (as POSIX specifies) since the quotes in | |
3487 | patterns are handled specially below. We have to do it in this order | |
3488 | because we're not supposed to perform word splitting. */ | |
3489 | wlist = expand_word_leave_quoted (case_command->word, 0); | |
3490 | if (wlist) | |
3491 | { | |
3492 | char *t; | |
3493 | t = string_list (wlist); | |
3494 | word = dequote_string (t); | |
3495 | free (t); | |
3496 | } | |
3497 | else | |
3498 | word = savestring (""); | |
ccc6cda3 JA |
3499 | dispose_words (wlist); |
3500 | ||
726f6388 | 3501 | retval = EXECUTION_SUCCESS; |
ccc6cda3 | 3502 | ignore_return = case_command->flags & CMD_IGNORE_RETURN; |
726f6388 JA |
3503 | |
3504 | begin_unwind_frame ("case"); | |
a0c0a00f | 3505 | add_unwind_protect (xfree, word); |
726f6388 | 3506 | |
ccc6cda3 JA |
3507 | #define EXIT_CASE() goto exit_case_command |
3508 | ||
3509 | for (clauses = case_command->clauses; clauses; clauses = clauses->next) | |
726f6388 JA |
3510 | { |
3511 | QUIT; | |
ccc6cda3 | 3512 | for (list = clauses->patterns; list; list = list->next) |
726f6388 | 3513 | { |
726f6388 JA |
3514 | es = expand_word_leave_quoted (list->word, 0); |
3515 | ||
3516 | if (es && es->word && es->word->word && *(es->word->word)) | |
d233b485 CR |
3517 | { |
3518 | /* Convert quoted null strings into empty strings. */ | |
3519 | qflags = QGLOB_CVTNULL; | |
3520 | ||
3521 | /* We left CTLESC in place quoting CTLESC and CTLNUL after the | |
3522 | call to expand_word_leave_quoted; tell quote_string_for_globbing | |
3523 | to remove those here. This works for both unquoted portions of | |
3524 | the word (which call quote_escapes) and quoted portions | |
3525 | (which call quote_string). */ | |
3526 | qflags |= QGLOB_CTLESC; | |
3527 | pattern = quote_string_for_globbing (es->word->word, qflags); | |
3528 | } | |
726f6388 | 3529 | else |
ccc6cda3 | 3530 | { |
f73dda09 | 3531 | pattern = (char *)xmalloc (1); |
ccc6cda3 JA |
3532 | pattern[0] = '\0'; |
3533 | } | |
726f6388 JA |
3534 | |
3535 | /* Since the pattern does not undergo quote removal (as per | |
f73dda09 | 3536 | Posix.2, section 3.9.4.3), the strmatch () call must be able |
726f6388 | 3537 | to recognize backslashes as escape characters. */ |
95732b49 | 3538 | match = strmatch (pattern, word, FNMATCH_EXTFLAG|FNMATCH_IGNCASE) != FNM_NOMATCH; |
726f6388 JA |
3539 | free (pattern); |
3540 | ||
3541 | dispose_words (es); | |
3542 | ||
3543 | if (match) | |
3544 | { | |
3185942a JA |
3545 | do |
3546 | { | |
3547 | if (clauses->action && ignore_return) | |
3548 | clauses->action->flags |= CMD_IGNORE_RETURN; | |
3549 | retval = execute_command (clauses->action); | |
3550 | } | |
3551 | while ((clauses->flags & CASEPAT_FALLTHROUGH) && (clauses = clauses->next)); | |
89a92869 | 3552 | if (clauses == 0 || (clauses->flags & CASEPAT_TESTNEXT) == 0) |
3185942a JA |
3553 | EXIT_CASE (); |
3554 | else | |
3555 | break; | |
726f6388 JA |
3556 | } |
3557 | ||
726f6388 JA |
3558 | QUIT; |
3559 | } | |
726f6388 JA |
3560 | } |
3561 | ||
ccc6cda3 JA |
3562 | exit_case_command: |
3563 | free (word); | |
726f6388 | 3564 | discard_unwind_frame ("case"); |
b80f6443 | 3565 | line_number = save_line_number; |
726f6388 JA |
3566 | return (retval); |
3567 | } | |
3568 | ||
3569 | #define CMD_WHILE 0 | |
3570 | #define CMD_UNTIL 1 | |
3571 | ||
3572 | /* The WHILE command. Syntax: WHILE test DO action; DONE. | |
3573 | Repeatedly execute action while executing test produces | |
3574 | EXECUTION_SUCCESS. */ | |
ccc6cda3 | 3575 | static int |
726f6388 JA |
3576 | execute_while_command (while_command) |
3577 | WHILE_COM *while_command; | |
3578 | { | |
3579 | return (execute_while_or_until (while_command, CMD_WHILE)); | |
3580 | } | |
3581 | ||
3582 | /* UNTIL is just like WHILE except that the test result is negated. */ | |
ccc6cda3 | 3583 | static int |
726f6388 JA |
3584 | execute_until_command (while_command) |
3585 | WHILE_COM *while_command; | |
3586 | { | |
3587 | return (execute_while_or_until (while_command, CMD_UNTIL)); | |
3588 | } | |
3589 | ||
3590 | /* The body for both while and until. The only difference between the | |
3591 | two is that the test value is treated differently. TYPE is | |
3592 | CMD_WHILE or CMD_UNTIL. The return value for both commands should | |
3593 | be EXECUTION_SUCCESS if no commands in the body are executed, and | |
3594 | the status of the last command executed in the body otherwise. */ | |
ccc6cda3 | 3595 | static int |
726f6388 JA |
3596 | execute_while_or_until (while_command, type) |
3597 | WHILE_COM *while_command; | |
3598 | int type; | |
3599 | { | |
3600 | int return_value, body_status; | |
3601 | ||
3602 | body_status = EXECUTION_SUCCESS; | |
3603 | loop_level++; | |
3604 | ||
3605 | while_command->test->flags |= CMD_IGNORE_RETURN; | |
3606 | if (while_command->flags & CMD_IGNORE_RETURN) | |
3607 | while_command->action->flags |= CMD_IGNORE_RETURN; | |
3608 | ||
3609 | while (1) | |
3610 | { | |
3611 | return_value = execute_command (while_command->test); | |
3612 | REAP (); | |
3613 | ||
f73dda09 JA |
3614 | /* Need to handle `break' in the test when we would break out of the |
3615 | loop. The job control code will set `breaking' to loop_level | |
3616 | when a job in a loop is stopped with SIGTSTP. If the stopped job | |
3617 | is in the loop test, `breaking' will not be reset unless we do | |
a0c0a00f CR |
3618 | this, and the shell will cease to execute commands. The same holds |
3619 | true for `continue'. */ | |
726f6388 | 3620 | if (type == CMD_WHILE && return_value != EXECUTION_SUCCESS) |
f73dda09 JA |
3621 | { |
3622 | if (breaking) | |
3623 | breaking--; | |
a0c0a00f CR |
3624 | if (continuing) |
3625 | continuing--; | |
f73dda09 JA |
3626 | break; |
3627 | } | |
726f6388 | 3628 | if (type == CMD_UNTIL && return_value == EXECUTION_SUCCESS) |
f73dda09 JA |
3629 | { |
3630 | if (breaking) | |
3631 | breaking--; | |
a0c0a00f CR |
3632 | if (continuing) |
3633 | continuing--; | |
f73dda09 JA |
3634 | break; |
3635 | } | |
726f6388 JA |
3636 | |
3637 | QUIT; | |
3638 | body_status = execute_command (while_command->action); | |
3639 | QUIT; | |
3640 | ||
3641 | if (breaking) | |
3642 | { | |
3643 | breaking--; | |
3644 | break; | |
3645 | } | |
3646 | ||
3647 | if (continuing) | |
3648 | { | |
3649 | continuing--; | |
3650 | if (continuing) | |
3651 | break; | |
3652 | } | |
3653 | } | |
3654 | loop_level--; | |
3655 | ||
3656 | return (body_status); | |
3657 | } | |
3658 | ||
3659 | /* IF test THEN command [ELSE command]. | |
3660 | IF also allows ELIF in the place of ELSE IF, but | |
3661 | the parser makes *that* stupidity transparent. */ | |
ccc6cda3 | 3662 | static int |
726f6388 JA |
3663 | execute_if_command (if_command) |
3664 | IF_COM *if_command; | |
3665 | { | |
b80f6443 | 3666 | int return_value, save_line_number; |
726f6388 | 3667 | |
b80f6443 | 3668 | save_line_number = line_number; |
726f6388 JA |
3669 | if_command->test->flags |= CMD_IGNORE_RETURN; |
3670 | return_value = execute_command (if_command->test); | |
b80f6443 | 3671 | line_number = save_line_number; |
726f6388 JA |
3672 | |
3673 | if (return_value == EXECUTION_SUCCESS) | |
3674 | { | |
3675 | QUIT; | |
ccc6cda3 | 3676 | |
726f6388 | 3677 | if (if_command->true_case && (if_command->flags & CMD_IGNORE_RETURN)) |
ccc6cda3 JA |
3678 | if_command->true_case->flags |= CMD_IGNORE_RETURN; |
3679 | ||
726f6388 JA |
3680 | return (execute_command (if_command->true_case)); |
3681 | } | |
3682 | else | |
3683 | { | |
3684 | QUIT; | |
3685 | ||
3686 | if (if_command->false_case && (if_command->flags & CMD_IGNORE_RETURN)) | |
3687 | if_command->false_case->flags |= CMD_IGNORE_RETURN; | |
3688 | ||
3689 | return (execute_command (if_command->false_case)); | |
3690 | } | |
3691 | } | |
3692 | ||
cce855bc JA |
3693 | #if defined (DPAREN_ARITHMETIC) |
3694 | static int | |
3695 | execute_arith_command (arith_command) | |
3696 | ARITH_COM *arith_command; | |
3697 | { | |
b80f6443 | 3698 | int expok, save_line_number, retval; |
7117c2d2 | 3699 | intmax_t expresult; |
f73dda09 | 3700 | WORD_LIST *new; |
0628567a | 3701 | char *exp; |
cce855bc | 3702 | |
f73dda09 | 3703 | expresult = 0; |
cce855bc | 3704 | |
b80f6443 | 3705 | save_line_number = line_number; |
b72432fd | 3706 | this_command_name = "(("; /* )) */ |
d233b485 | 3707 | line_number_for_err_trap = line_number = arith_command->line; |
cce855bc | 3708 | /* If we're in a function, update the line number information. */ |
d233b485 | 3709 | if (variable_context && interactive_shell && sourcelevel == 0) |
a0c0a00f | 3710 | { |
d233b485 CR |
3711 | /* line numbers in a function start at 1 */ |
3712 | line_number -= function_line_number - 1; | |
3713 | if (line_number <= 0) | |
3714 | line_number = 1; | |
a0c0a00f | 3715 | } |
b80f6443 JA |
3716 | |
3717 | command_string_index = 0; | |
3718 | print_arith_command (arith_command->exp); | |
95732b49 | 3719 | |
d233b485 | 3720 | if (signal_in_progress (DEBUG_TRAP) == 0 && running_trap == 0) |
95732b49 JA |
3721 | { |
3722 | FREE (the_printed_command_except_trap); | |
3723 | the_printed_command_except_trap = savestring (the_printed_command); | |
3724 | } | |
cce855bc | 3725 | |
7117c2d2 JA |
3726 | /* Run the debug trap before each arithmetic command, but do it after we |
3727 | update the line number information and before we expand the various | |
3728 | words in the expression. */ | |
b80f6443 JA |
3729 | retval = run_debug_trap (); |
3730 | #if defined (DEBUGGER) | |
3731 | /* In debugging mode, if the DEBUG trap returns a non-zero status, we | |
3732 | skip the command. */ | |
3733 | if (debugging_mode && retval != EXECUTION_SUCCESS) | |
3734 | { | |
3735 | line_number = save_line_number; | |
3736 | return (EXECUTION_SUCCESS); | |
3737 | } | |
3738 | #endif | |
7117c2d2 | 3739 | |
b80f6443 | 3740 | new = expand_words_no_vars (arith_command->exp); |
cce855bc JA |
3741 | |
3742 | /* If we're tracing, make a new word list with `((' at the front and `))' | |
3743 | at the back and print it. */ | |
3744 | if (echo_command_at_execute) | |
3745 | xtrace_print_arith_cmd (new); | |
3746 | ||
b80f6443 JA |
3747 | if (new) |
3748 | { | |
0628567a | 3749 | exp = new->next ? string_list (new) : new->word->word; |
d233b485 | 3750 | expresult = evalexp (exp, EXP_EXPANDED, &expok); |
b80f6443 | 3751 | line_number = save_line_number; |
0628567a JA |
3752 | if (exp != new->word->word) |
3753 | free (exp); | |
b80f6443 JA |
3754 | dispose_words (new); |
3755 | } | |
3756 | else | |
3757 | { | |
3758 | expresult = 0; | |
3759 | expok = 1; | |
3760 | } | |
cce855bc JA |
3761 | |
3762 | if (expok == 0) | |
3763 | return (EXECUTION_FAILURE); | |
3764 | ||
f73dda09 | 3765 | return (expresult == 0 ? EXECUTION_FAILURE : EXECUTION_SUCCESS); |
cce855bc JA |
3766 | } |
3767 | #endif /* DPAREN_ARITHMETIC */ | |
3768 | ||
3769 | #if defined (COND_COMMAND) | |
3770 | ||
3185942a | 3771 | static char * const nullstr = ""; |
cce855bc | 3772 | |
ac50fbac | 3773 | /* XXX - can COND ever be NULL when this is called? */ |
cce855bc JA |
3774 | static int |
3775 | execute_cond_node (cond) | |
3776 | COND_COM *cond; | |
3777 | { | |
0001803f | 3778 | int result, invert, patmatch, rmatch, mflags, ignore; |
f73dda09 | 3779 | char *arg1, *arg2; |
ac50fbac CR |
3780 | #if 0 |
3781 | char *t1, *t2; | |
3782 | #endif | |
cce855bc JA |
3783 | |
3784 | invert = (cond->flags & CMD_INVERT_RETURN); | |
0001803f CR |
3785 | ignore = (cond->flags & CMD_IGNORE_RETURN); |
3786 | if (ignore) | |
3787 | { | |
3788 | if (cond->left) | |
3789 | cond->left->flags |= CMD_IGNORE_RETURN; | |
3790 | if (cond->right) | |
3791 | cond->right->flags |= CMD_IGNORE_RETURN; | |
3792 | } | |
3793 | ||
cce855bc JA |
3794 | if (cond->type == COND_EXPR) |
3795 | result = execute_cond_node (cond->left); | |
3796 | else if (cond->type == COND_OR) | |
3797 | { | |
3798 | result = execute_cond_node (cond->left); | |
3799 | if (result != EXECUTION_SUCCESS) | |
3800 | result = execute_cond_node (cond->right); | |
3801 | } | |
3802 | else if (cond->type == COND_AND) | |
3803 | { | |
3804 | result = execute_cond_node (cond->left); | |
3805 | if (result == EXECUTION_SUCCESS) | |
3806 | result = execute_cond_node (cond->right); | |
3807 | } | |
3808 | else if (cond->type == COND_UNARY) | |
3809 | { | |
0001803f CR |
3810 | if (ignore) |
3811 | comsub_ignore_return++; | |
cce855bc | 3812 | arg1 = cond_expand_word (cond->left->op, 0); |
0001803f CR |
3813 | if (ignore) |
3814 | comsub_ignore_return--; | |
cce855bc JA |
3815 | if (arg1 == 0) |
3816 | arg1 = nullstr; | |
3817 | if (echo_command_at_execute) | |
3818 | xtrace_print_cond_term (cond->type, invert, cond->op, arg1, (char *)NULL); | |
3819 | result = unary_test (cond->op->word, arg1) ? EXECUTION_SUCCESS : EXECUTION_FAILURE; | |
3820 | if (arg1 != nullstr) | |
3821 | free (arg1); | |
3822 | } | |
3823 | else if (cond->type == COND_BINARY) | |
3824 | { | |
0628567a | 3825 | rmatch = 0; |
ac50fbac CR |
3826 | patmatch = (((cond->op->word[1] == '=') && (cond->op->word[2] == '\0') && |
3827 | (cond->op->word[0] == '!' || cond->op->word[0] == '=')) || | |
b72432fd | 3828 | (cond->op->word[0] == '=' && cond->op->word[1] == '\0')); |
b80f6443 JA |
3829 | #if defined (COND_REGEXP) |
3830 | rmatch = (cond->op->word[0] == '=' && cond->op->word[1] == '~' && | |
3831 | cond->op->word[2] == '\0'); | |
3832 | #endif | |
cce855bc | 3833 | |
0001803f CR |
3834 | if (ignore) |
3835 | comsub_ignore_return++; | |
cce855bc | 3836 | arg1 = cond_expand_word (cond->left->op, 0); |
0001803f CR |
3837 | if (ignore) |
3838 | comsub_ignore_return--; | |
cce855bc JA |
3839 | if (arg1 == 0) |
3840 | arg1 = nullstr; | |
0001803f CR |
3841 | if (ignore) |
3842 | comsub_ignore_return++; | |
f1be666c JA |
3843 | arg2 = cond_expand_word (cond->right->op, |
3844 | (rmatch && shell_compatibility_level > 31) ? 2 : (patmatch ? 1 : 0)); | |
0001803f CR |
3845 | if (ignore) |
3846 | comsub_ignore_return--; | |
cce855bc JA |
3847 | if (arg2 == 0) |
3848 | arg2 = nullstr; | |
3849 | ||
3850 | if (echo_command_at_execute) | |
3851 | xtrace_print_cond_term (cond->type, invert, cond->op, arg1, arg2); | |
3852 | ||
b80f6443 JA |
3853 | #if defined (COND_REGEXP) |
3854 | if (rmatch) | |
3855 | { | |
3856 | mflags = SHMAT_PWARN; | |
3857 | #if defined (ARRAY_VARS) | |
3858 | mflags |= SHMAT_SUBEXP; | |
3859 | #endif | |
3860 | ||
ac50fbac CR |
3861 | #if 0 |
3862 | t1 = strescape(arg1); | |
3863 | t2 = strescape(arg2); | |
3864 | itrace("execute_cond_node: sh_regmatch on `%s' and `%s'", t1, t2); | |
3865 | free(t1); | |
3866 | free(t2); | |
3867 | #endif | |
3868 | ||
b80f6443 JA |
3869 | result = sh_regmatch (arg1, arg2, mflags); |
3870 | } | |
3871 | else | |
3872 | #endif /* COND_REGEXP */ | |
95732b49 JA |
3873 | { |
3874 | int oe; | |
3875 | oe = extended_glob; | |
3876 | extended_glob = 1; | |
0001803f | 3877 | result = binary_test (cond->op->word, arg1, arg2, TEST_PATMATCH|TEST_ARITHEXP|TEST_LOCALE) |
95732b49 JA |
3878 | ? EXECUTION_SUCCESS |
3879 | : EXECUTION_FAILURE; | |
3880 | extended_glob = oe; | |
3881 | } | |
cce855bc JA |
3882 | if (arg1 != nullstr) |
3883 | free (arg1); | |
3884 | if (arg2 != nullstr) | |
3885 | free (arg2); | |
3886 | } | |
3887 | else | |
3888 | { | |
b72432fd | 3889 | command_error ("execute_cond_node", CMDERR_BADTYPE, cond->type, 0); |
cce855bc JA |
3890 | jump_to_top_level (DISCARD); |
3891 | result = EXECUTION_FAILURE; | |
3892 | } | |
3893 | ||
3894 | if (invert) | |
3895 | result = (result == EXECUTION_SUCCESS) ? EXECUTION_FAILURE : EXECUTION_SUCCESS; | |
3896 | ||
3897 | return result; | |
3898 | } | |
3899 | ||
3900 | static int | |
3901 | execute_cond_command (cond_command) | |
3902 | COND_COM *cond_command; | |
3903 | { | |
b80f6443 | 3904 | int retval, save_line_number; |
cce855bc | 3905 | |
b80f6443 | 3906 | save_line_number = line_number; |
cce855bc JA |
3907 | |
3908 | this_command_name = "[["; | |
d233b485 | 3909 | line_number_for_err_trap = line_number = cond_command->line; |
cce855bc | 3910 | /* If we're in a function, update the line number information. */ |
d233b485 | 3911 | if (variable_context && interactive_shell && sourcelevel == 0) |
a0c0a00f | 3912 | { |
d233b485 CR |
3913 | /* line numbers in a function start at 1 */ |
3914 | line_number -= function_line_number - 1; | |
3915 | if (line_number <= 0) | |
3916 | line_number = 1; | |
a0c0a00f | 3917 | } |
b80f6443 JA |
3918 | command_string_index = 0; |
3919 | print_cond_command (cond_command); | |
95732b49 | 3920 | |
d233b485 | 3921 | if (signal_in_progress (DEBUG_TRAP) == 0 && running_trap == 0) |
95732b49 JA |
3922 | { |
3923 | FREE (the_printed_command_except_trap); | |
3924 | the_printed_command_except_trap = savestring (the_printed_command); | |
3925 | } | |
cce855bc | 3926 | |
7117c2d2 JA |
3927 | /* Run the debug trap before each conditional command, but do it after we |
3928 | update the line number information. */ | |
b80f6443 JA |
3929 | retval = run_debug_trap (); |
3930 | #if defined (DEBUGGER) | |
3931 | /* In debugging mode, if the DEBUG trap returns a non-zero status, we | |
3932 | skip the command. */ | |
3933 | if (debugging_mode && retval != EXECUTION_SUCCESS) | |
3934 | { | |
3935 | line_number = save_line_number; | |
3936 | return (EXECUTION_SUCCESS); | |
3937 | } | |
3938 | #endif | |
7117c2d2 | 3939 | |
cce855bc JA |
3940 | #if 0 |
3941 | debug_print_cond_command (cond_command); | |
3942 | #endif | |
b80f6443 JA |
3943 | |
3944 | last_command_exit_value = retval = execute_cond_node (cond_command); | |
3945 | line_number = save_line_number; | |
3946 | return (retval); | |
cce855bc JA |
3947 | } |
3948 | #endif /* COND_COMMAND */ | |
3949 | ||
726f6388 JA |
3950 | static void |
3951 | bind_lastarg (arg) | |
3952 | char *arg; | |
3953 | { | |
3954 | SHELL_VAR *var; | |
3955 | ||
ccc6cda3 | 3956 | if (arg == 0) |
726f6388 | 3957 | arg = ""; |
95732b49 | 3958 | var = bind_variable ("_", arg, 0); |
a0c0a00f CR |
3959 | if (var) |
3960 | VUNSETATTR (var, att_exported); | |
726f6388 JA |
3961 | } |
3962 | ||
ccc6cda3 JA |
3963 | /* Execute a null command. Fork a subshell if the command uses pipes or is |
3964 | to be run asynchronously. This handles all the side effects that are | |
3965 | supposed to take place. */ | |
3966 | static int | |
95732b49 | 3967 | execute_null_command (redirects, pipe_in, pipe_out, async) |
ccc6cda3 | 3968 | REDIRECT *redirects; |
bb70624e | 3969 | int pipe_in, pipe_out, async; |
ccc6cda3 | 3970 | { |
b80f6443 | 3971 | int r; |
0001803f CR |
3972 | int forcefork; |
3973 | REDIRECT *rd; | |
b80f6443 | 3974 | |
0001803f | 3975 | for (forcefork = 0, rd = redirects; rd; rd = rd->next) |
d233b485 CR |
3976 | { |
3977 | forcefork += rd->rflags & REDIR_VARASSIGN; | |
3978 | /* Safety */ | |
3979 | 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); | |
3980 | } | |
0001803f CR |
3981 | |
3982 | if (forcefork || pipe_in != NO_PIPE || pipe_out != NO_PIPE || async) | |
ccc6cda3 JA |
3983 | { |
3984 | /* We have a null command, but we really want a subshell to take | |
3985 | care of it. Just fork, do piping and redirections, and exit. */ | |
3986 | if (make_child ((char *)NULL, async) == 0) | |
3987 | { | |
3988 | /* Cancel traps, in trap.c. */ | |
3989 | restore_original_signals (); /* XXX */ | |
3990 | ||
3991 | do_piping (pipe_in, pipe_out); | |
3992 | ||
3185942a JA |
3993 | #if defined (COPROCESS_SUPPORT) |
3994 | coproc_closeall (); | |
3995 | #endif | |
3996 | ||
d233b485 CR |
3997 | interactive = 0; /* XXX */ |
3998 | ||
3185942a | 3999 | subshell_environment = 0; |
0628567a JA |
4000 | if (async) |
4001 | subshell_environment |= SUBSHELL_ASYNC; | |
4002 | if (pipe_in != NO_PIPE || pipe_out != NO_PIPE) | |
4003 | subshell_environment |= SUBSHELL_PIPE; | |
ccc6cda3 | 4004 | |
b80f6443 | 4005 | if (do_redirections (redirects, RX_ACTIVE) == 0) |
ccc6cda3 JA |
4006 | exit (EXECUTION_SUCCESS); |
4007 | else | |
4008 | exit (EXECUTION_FAILURE); | |
4009 | } | |
4010 | else | |
4011 | { | |
4012 | close_pipes (pipe_in, pipe_out); | |
4013 | #if defined (PROCESS_SUBSTITUTION) && defined (HAVE_DEV_FD) | |
ac50fbac CR |
4014 | if (pipe_out == NO_PIPE) |
4015 | unlink_fifo_list (); | |
ccc6cda3 JA |
4016 | #endif |
4017 | return (EXECUTION_SUCCESS); | |
4018 | } | |
4019 | } | |
4020 | else | |
4021 | { | |
4022 | /* Even if there aren't any command names, pretend to do the | |
4023 | redirections that are specified. The user expects the side | |
4024 | effects to take place. If the redirections fail, then return | |
4025 | failure. Otherwise, if a command substitution took place while | |
4026 | expanding the command or a redirection, return the value of that | |
4027 | substitution. Otherwise, return EXECUTION_SUCCESS. */ | |
4028 | ||
b80f6443 JA |
4029 | r = do_redirections (redirects, RX_ACTIVE|RX_UNDOABLE); |
4030 | cleanup_redirects (redirection_undo_list); | |
4031 | redirection_undo_list = (REDIRECT *)NULL; | |
4032 | ||
4033 | if (r != 0) | |
ccc6cda3 | 4034 | return (EXECUTION_FAILURE); |
95732b49 | 4035 | else if (last_command_subst_pid != NO_PID) |
ccc6cda3 JA |
4036 | return (last_command_exit_value); |
4037 | else | |
4038 | return (EXECUTION_SUCCESS); | |
4039 | } | |
4040 | } | |
4041 | ||
4042 | /* This is a hack to suppress word splitting for assignment statements | |
4043 | given as arguments to builtins with the ASSIGNMENT_BUILTIN flag set. */ | |
4044 | static void | |
4045 | fix_assignment_words (words) | |
4046 | WORD_LIST *words; | |
4047 | { | |
ac50fbac | 4048 | WORD_LIST *w, *wcmd; |
ccc6cda3 | 4049 | struct builtin *b; |
ac50fbac | 4050 | int assoc, global, array, integer; |
ccc6cda3 JA |
4051 | |
4052 | if (words == 0) | |
4053 | return; | |
4054 | ||
7117c2d2 | 4055 | b = 0; |
ac50fbac | 4056 | assoc = global = array = integer = 0; |
ccc6cda3 | 4057 | |
ac50fbac CR |
4058 | /* Skip over assignment statements preceding a command name */ |
4059 | wcmd = words; | |
4060 | for (wcmd = words; wcmd; wcmd = wcmd->next) | |
4061 | if ((wcmd->word->flags & W_ASSIGNMENT) == 0) | |
4062 | break; | |
a0c0a00f CR |
4063 | /* Posix (post-2008) says that `command' doesn't change whether |
4064 | or not the builtin it shadows is a `declaration command', even | |
4065 | though it removes other special builtin properties. In Posix | |
4066 | mode, we skip over one or more instances of `command' and | |
4067 | deal with the next word as the assignment builtin. */ | |
4068 | while (posixly_correct && wcmd && wcmd->word && wcmd->word->word && STREQ (wcmd->word->word, "command")) | |
4069 | wcmd = wcmd->next; | |
ac50fbac CR |
4070 | |
4071 | for (w = wcmd; w; w = w->next) | |
ccc6cda3 | 4072 | if (w->word->flags & W_ASSIGNMENT) |
7117c2d2 | 4073 | { |
a0c0a00f | 4074 | /* Lazy builtin lookup, only do it if we find an assignment */ |
7117c2d2 JA |
4075 | if (b == 0) |
4076 | { | |
ac50fbac | 4077 | b = builtin_address_internal (wcmd->word->word, 0); |
7117c2d2 JA |
4078 | if (b == 0 || (b->flags & ASSIGNMENT_BUILTIN) == 0) |
4079 | return; | |
95732b49 | 4080 | else if (b && (b->flags & ASSIGNMENT_BUILTIN)) |
ac50fbac | 4081 | wcmd->word->flags |= W_ASSNBLTIN; |
7117c2d2 | 4082 | } |
95732b49 | 4083 | w->word->flags |= (W_NOSPLIT|W_NOGLOB|W_TILDEEXP|W_ASSIGNARG); |
3185942a JA |
4084 | #if defined (ARRAY_VARS) |
4085 | if (assoc) | |
4086 | w->word->flags |= W_ASSIGNASSOC; | |
ac50fbac CR |
4087 | if (array) |
4088 | w->word->flags |= W_ASSIGNARRAY; | |
4089 | #endif | |
6d41b715 CR |
4090 | if (global) |
4091 | w->word->flags |= W_ASSNGLOBAL; | |
a0c0a00f CR |
4092 | |
4093 | /* If we have an assignment builtin that does not create local variables, | |
4094 | make sure we create global variables even if we internally call | |
d233b485 CR |
4095 | `declare'. The CHKLOCAL flag means to set attributes or values on |
4096 | an existing local variable, if there is one. */ | |
a0c0a00f | 4097 | if (b && ((b->flags & (ASSIGNMENT_BUILTIN|LOCALVAR_BUILTIN)) == ASSIGNMENT_BUILTIN)) |
d233b485 CR |
4098 | w->word->flags |= W_ASSNGLOBAL|W_CHKLOCAL; |
4099 | #if 0 | |
4100 | else if (b && (b->flags & ASSIGNMENT_BUILTIN) && (b->flags & LOCALVAR_BUILTIN)) | |
4101 | w->word->flags |= W_CHKLOCAL; | |
4102 | #endif | |
7117c2d2 | 4103 | } |
3185942a JA |
4104 | #if defined (ARRAY_VARS) |
4105 | /* Note that we saw an associative array option to a builtin that takes | |
4106 | assignment statements. This is a bit of a kludge. */ | |
a0c0a00f | 4107 | else if (w->word->word[0] == '-' && (strpbrk (w->word->word+1, "Aag") != 0)) |
6d41b715 CR |
4108 | #else |
4109 | else if (w->word->word[0] == '-' && strchr (w->word->word+1, 'g')) | |
4110 | #endif | |
3185942a JA |
4111 | { |
4112 | if (b == 0) | |
4113 | { | |
ac50fbac | 4114 | b = builtin_address_internal (wcmd->word->word, 0); |
3185942a JA |
4115 | if (b == 0 || (b->flags & ASSIGNMENT_BUILTIN) == 0) |
4116 | return; | |
4117 | else if (b && (b->flags & ASSIGNMENT_BUILTIN)) | |
ac50fbac | 4118 | wcmd->word->flags |= W_ASSNBLTIN; |
3185942a | 4119 | } |
ac50fbac | 4120 | if ((wcmd->word->flags & W_ASSNBLTIN) && strchr (w->word->word+1, 'A')) |
3185942a | 4121 | assoc = 1; |
ac50fbac CR |
4122 | else if ((wcmd->word->flags & W_ASSNBLTIN) && strchr (w->word->word+1, 'a')) |
4123 | array = 1; | |
4124 | if ((wcmd->word->flags & W_ASSNBLTIN) && strchr (w->word->word+1, 'g')) | |
6d41b715 | 4125 | global = 1; |
3185942a | 4126 | } |
3185942a JA |
4127 | } |
4128 | ||
4129 | /* Return 1 if the file found by searching $PATH for PATHNAME, defaulting | |
4130 | to PATHNAME, is a directory. Used by the autocd code below. */ | |
4131 | static int | |
4132 | is_dirname (pathname) | |
4133 | char *pathname; | |
4134 | { | |
4135 | char *temp; | |
ac50fbac CR |
4136 | int ret; |
4137 | ||
4138 | temp = search_for_command (pathname, 0); | |
a0c0a00f | 4139 | ret = temp ? file_isdir (temp) : file_isdir (pathname); |
ac50fbac CR |
4140 | free (temp); |
4141 | return ret; | |
ccc6cda3 JA |
4142 | } |
4143 | ||
726f6388 JA |
4144 | /* The meaty part of all the executions. We have to start hacking the |
4145 | real execution of commands here. Fork a process, set things up, | |
4146 | execute the command. */ | |
ccc6cda3 | 4147 | static int |
726f6388 JA |
4148 | execute_simple_command (simple_command, pipe_in, pipe_out, async, fds_to_close) |
4149 | SIMPLE_COM *simple_command; | |
4150 | int pipe_in, pipe_out, async; | |
4151 | struct fd_bitmap *fds_to_close; | |
4152 | { | |
4153 | WORD_LIST *words, *lastword; | |
ccc6cda3 | 4154 | char *command_line, *lastarg, *temp; |
bc4cd23c | 4155 | int first_word_quoted, result, builtin_is_special, already_forked, dofork; |
95732b49 | 4156 | pid_t old_last_async_pid; |
f73dda09 | 4157 | sh_builtin_func_t *builtin; |
ccc6cda3 | 4158 | SHELL_VAR *func; |
495aee44 | 4159 | volatile int old_builtin, old_command_builtin; |
726f6388 JA |
4160 | |
4161 | result = EXECUTION_SUCCESS; | |
ccc6cda3 | 4162 | special_builtin_failed = builtin_is_special = 0; |
cce855bc | 4163 | command_line = (char *)0; |
726f6388 | 4164 | |
ac50fbac CR |
4165 | QUIT; |
4166 | ||
ccc6cda3 | 4167 | /* If we're in a function, update the line number information. */ |
0001803f | 4168 | if (variable_context && interactive_shell && sourcelevel == 0) |
a0c0a00f | 4169 | { |
d233b485 CR |
4170 | /* line numbers in a function start at 1 */ |
4171 | line_number -= function_line_number - 1; | |
4172 | if (line_number <= 0) | |
4173 | line_number = 1; | |
a0c0a00f | 4174 | } |
7117c2d2 | 4175 | |
726f6388 JA |
4176 | /* Remember what this command line looks like at invocation. */ |
4177 | command_string_index = 0; | |
4178 | print_simple_command (simple_command); | |
726f6388 | 4179 | |
0628567a | 4180 | #if 0 |
95732b49 | 4181 | if (signal_in_progress (DEBUG_TRAP) == 0 && (this_command_name == 0 || (STREQ (this_command_name, "trap") == 0))) |
0628567a JA |
4182 | #else |
4183 | if (signal_in_progress (DEBUG_TRAP) == 0 && running_trap == 0) | |
4184 | #endif | |
b80f6443 JA |
4185 | { |
4186 | FREE (the_printed_command_except_trap); | |
95732b49 | 4187 | the_printed_command_except_trap = the_printed_command ? savestring (the_printed_command) : (char *)0; |
b80f6443 JA |
4188 | } |
4189 | ||
4190 | /* Run the debug trap before each simple command, but do it after we | |
4191 | update the line number information. */ | |
4192 | result = run_debug_trap (); | |
4193 | #if defined (DEBUGGER) | |
4194 | /* In debugging mode, if the DEBUG trap returns a non-zero status, we | |
4195 | skip the command. */ | |
4196 | if (debugging_mode && result != EXECUTION_SUCCESS) | |
4197 | return (EXECUTION_SUCCESS); | |
4198 | #endif | |
4199 | ||
726f6388 | 4200 | first_word_quoted = |
3185942a | 4201 | simple_command->words ? (simple_command->words->word->flags & W_QUOTED) : 0; |
726f6388 | 4202 | |
95732b49 | 4203 | last_command_subst_pid = NO_PID; |
b72432fd | 4204 | old_last_async_pid = last_asynchronous_pid; |
726f6388 | 4205 | |
d233b485 | 4206 | already_forked = 0; |
bc4cd23c JA |
4207 | |
4208 | /* If we're in a pipeline or run in the background, set DOFORK so we | |
4209 | make the child early, before word expansion. This keeps assignment | |
4210 | statements from affecting the parent shell's environment when they | |
4211 | should not. */ | |
4212 | dofork = pipe_in != NO_PIPE || pipe_out != NO_PIPE || async; | |
4213 | ||
4214 | /* Something like `%2 &' should restart job 2 in the background, not cause | |
4215 | the shell to fork here. */ | |
4216 | if (dofork && pipe_in == NO_PIPE && pipe_out == NO_PIPE && | |
4217 | simple_command->words && simple_command->words->word && | |
4218 | simple_command->words->word->word && | |
4219 | (simple_command->words->word->word[0] == '%')) | |
4220 | dofork = 0; | |
4221 | ||
4222 | if (dofork) | |
cce855bc | 4223 | { |
d233b485 CR |
4224 | char *p; |
4225 | ||
bb70624e JA |
4226 | /* Do this now, because execute_disk_command will do it anyway in the |
4227 | vast majority of cases. */ | |
4228 | maybe_make_export_env (); | |
4229 | ||
95732b49 JA |
4230 | /* Don't let a DEBUG trap overwrite the command string to be saved with |
4231 | the process/job associated with this child. */ | |
d233b485 | 4232 | if (make_child (p = savestring (the_printed_command_except_trap), async) == 0) |
cce855bc JA |
4233 | { |
4234 | already_forked = 1; | |
4235 | simple_command->flags |= CMD_NO_FORK; | |
4236 | ||
a0c0a00f | 4237 | subshell_environment = SUBSHELL_FORK; /* XXX */ |
95732b49 JA |
4238 | if (pipe_in != NO_PIPE || pipe_out != NO_PIPE) |
4239 | subshell_environment |= SUBSHELL_PIPE; | |
4240 | if (async) | |
4241 | subshell_environment |= SUBSHELL_ASYNC; | |
28ef6c31 | 4242 | |
bb70624e JA |
4243 | /* We need to do this before piping to handle some really |
4244 | pathological cases where one of the pipe file descriptors | |
4245 | is < 2. */ | |
4246 | if (fds_to_close) | |
4247 | close_fd_bitmap (fds_to_close); | |
4248 | ||
a0c0a00f CR |
4249 | /* If we fork because of an input pipe, note input pipe for later to |
4250 | inhibit async commands from redirecting stdin from /dev/null */ | |
4251 | stdin_redir |= pipe_in != NO_PIPE; | |
4252 | ||
cce855bc | 4253 | do_piping (pipe_in, pipe_out); |
f73dda09 | 4254 | pipe_in = pipe_out = NO_PIPE; |
3185942a JA |
4255 | #if defined (COPROCESS_SUPPORT) |
4256 | coproc_closeall (); | |
4257 | #endif | |
cce855bc | 4258 | |
b72432fd | 4259 | last_asynchronous_pid = old_last_async_pid; |
ac50fbac CR |
4260 | |
4261 | CHECK_SIGTERM; | |
a0c0a00f CR |
4262 | |
4263 | if (async) | |
4264 | subshell_level++; /* not for pipes yet */ | |
d233b485 CR |
4265 | |
4266 | #if defined (JOB_CONTROL) | |
4267 | FREE (p); /* child doesn't use pointer */ | |
4268 | #endif | |
cce855bc JA |
4269 | } |
4270 | else | |
4271 | { | |
495aee44 CR |
4272 | /* Don't let simple commands that aren't the last command in a |
4273 | pipeline change $? for the rest of the pipeline (or at all). */ | |
4274 | if (pipe_out != NO_PIPE) | |
4275 | result = last_command_exit_value; | |
cce855bc JA |
4276 | close_pipes (pipe_in, pipe_out); |
4277 | #if defined (PROCESS_SUBSTITUTION) && defined (HAVE_DEV_FD) | |
d233b485 | 4278 | #if 0 |
ac50fbac CR |
4279 | /* Close /dev/fd file descriptors in the parent after forking the |
4280 | last child in a (possibly one-element) pipeline. Defer this | |
4281 | until any running shell function completes. */ | |
4282 | if (pipe_out == NO_PIPE && variable_context == 0) /* XXX */ | |
4283 | unlink_fifo_list (); /* XXX */ | |
d233b485 | 4284 | #endif |
cce855bc JA |
4285 | #endif |
4286 | command_line = (char *)NULL; /* don't free this. */ | |
d233b485 | 4287 | #if 0 |
cce855bc | 4288 | bind_lastarg ((char *)NULL); |
d233b485 | 4289 | #endif |
cce855bc JA |
4290 | return (result); |
4291 | } | |
4292 | } | |
4293 | ||
a0c0a00f CR |
4294 | QUIT; /* XXX */ |
4295 | ||
726f6388 JA |
4296 | /* If we are re-running this as the result of executing the `command' |
4297 | builtin, do not expand the command words a second time. */ | |
4298 | if ((simple_command->flags & CMD_INHIBIT_EXPANSION) == 0) | |
4299 | { | |
4300 | current_fds_to_close = fds_to_close; | |
ccc6cda3 | 4301 | fix_assignment_words (simple_command->words); |
3185942a JA |
4302 | /* Pass the ignore return flag down to command substitutions */ |
4303 | if (simple_command->flags & CMD_IGNORE_RETURN) /* XXX */ | |
4304 | comsub_ignore_return++; | |
726f6388 | 4305 | words = expand_words (simple_command->words); |
3185942a JA |
4306 | if (simple_command->flags & CMD_IGNORE_RETURN) |
4307 | comsub_ignore_return--; | |
726f6388 JA |
4308 | current_fds_to_close = (struct fd_bitmap *)NULL; |
4309 | } | |
4310 | else | |
4311 | words = copy_word_list (simple_command->words); | |
4312 | ||
726f6388 JA |
4313 | /* It is possible for WORDS not to have anything left in it. |
4314 | Perhaps all the words consisted of `$foo', and there was | |
4315 | no variable `$foo'. */ | |
ccc6cda3 | 4316 | if (words == 0) |
726f6388 | 4317 | { |
b80f6443 | 4318 | this_command_name = 0; |
ccc6cda3 | 4319 | result = execute_null_command (simple_command->redirects, |
cce855bc | 4320 | pipe_in, pipe_out, |
95732b49 | 4321 | already_forked ? 0 : async); |
cce855bc | 4322 | if (already_forked) |
a0c0a00f | 4323 | sh_exit (result); |
cce855bc JA |
4324 | else |
4325 | { | |
4326 | bind_lastarg ((char *)NULL); | |
4327 | set_pipestatus_from_exit (result); | |
4328 | return (result); | |
4329 | } | |
ccc6cda3 | 4330 | } |
726f6388 | 4331 | |
ccc6cda3 | 4332 | lastarg = (char *)NULL; |
726f6388 | 4333 | |
ccc6cda3 | 4334 | begin_unwind_frame ("simple-command"); |
726f6388 | 4335 | |
ccc6cda3 | 4336 | if (echo_command_at_execute) |
b80f6443 | 4337 | xtrace_print_word_list (words, 1); |
726f6388 | 4338 | |
f73dda09 | 4339 | builtin = (sh_builtin_func_t *)NULL; |
ccc6cda3 JA |
4340 | func = (SHELL_VAR *)NULL; |
4341 | if ((simple_command->flags & CMD_NO_FUNCTIONS) == 0) | |
4342 | { | |
4343 | /* Posix.2 says special builtins are found before functions. We | |
4344 | don't set builtin_is_special anywhere other than here, because | |
4345 | this path is followed only when the `command' builtin is *not* | |
4346 | being used, and we don't want to exit the shell if a special | |
4347 | builtin executed with `command builtin' fails. `command' is not | |
4348 | a special builtin. */ | |
4349 | if (posixly_correct) | |
4350 | { | |
4351 | builtin = find_special_builtin (words->word->word); | |
4352 | if (builtin) | |
4353 | builtin_is_special = 1; | |
726f6388 | 4354 | } |
ccc6cda3 | 4355 | if (builtin == 0) |
726f6388 | 4356 | func = find_function (words->word->word); |
ccc6cda3 | 4357 | } |
726f6388 | 4358 | |
b80f6443 JA |
4359 | /* In POSIX mode, assignment errors in the temporary environment cause a |
4360 | non-interactive shell to exit. */ | |
ac50fbac | 4361 | if (posixly_correct && builtin_is_special && interactive_shell == 0 && tempenv_assign_error) |
b80f6443 JA |
4362 | { |
4363 | last_command_exit_value = EXECUTION_FAILURE; | |
4364 | jump_to_top_level (ERREXIT); | |
4365 | } | |
ac50fbac | 4366 | tempenv_assign_error = 0; /* don't care about this any more */ |
b80f6443 | 4367 | |
ccc6cda3 JA |
4368 | add_unwind_protect (dispose_words, words); |
4369 | QUIT; | |
726f6388 | 4370 | |
ccc6cda3 JA |
4371 | /* Bind the last word in this command to "$_" after execution. */ |
4372 | for (lastword = words; lastword->next; lastword = lastword->next) | |
4373 | ; | |
4374 | lastarg = lastword->word->word; | |
726f6388 JA |
4375 | |
4376 | #if defined (JOB_CONTROL) | |
ccc6cda3 | 4377 | /* Is this command a job control related thing? */ |
cce855bc | 4378 | if (words->word->word[0] == '%' && already_forked == 0) |
ccc6cda3 JA |
4379 | { |
4380 | this_command_name = async ? "bg" : "fg"; | |
726f6388 | 4381 | last_shell_builtin = this_shell_builtin; |
ccc6cda3 JA |
4382 | this_shell_builtin = builtin_address (this_command_name); |
4383 | result = (*this_shell_builtin) (words); | |
4384 | goto return_result; | |
4385 | } | |
726f6388 | 4386 | |
ac50fbac | 4387 | /* One other possibililty. The user may want to resume an existing job. |
ccc6cda3 JA |
4388 | If they do, find out whether this word is a candidate for a running |
4389 | job. */ | |
cce855bc | 4390 | if (job_control && already_forked == 0 && async == 0 && |
ccc6cda3 JA |
4391 | !first_word_quoted && |
4392 | !words->next && | |
4393 | words->word->word[0] && | |
4394 | !simple_command->redirects && | |
4395 | pipe_in == NO_PIPE && | |
4396 | pipe_out == NO_PIPE && | |
4397 | (temp = get_string_value ("auto_resume"))) | |
4398 | { | |
7117c2d2 | 4399 | int job, jflags, started_status; |
ccc6cda3 | 4400 | |
7117c2d2 JA |
4401 | jflags = JM_STOPPED|JM_FIRSTMATCH; |
4402 | if (STREQ (temp, "exact")) | |
4403 | jflags |= JM_EXACT; | |
4404 | else if (STREQ (temp, "substring")) | |
4405 | jflags |= JM_SUBSTRING; | |
4406 | else | |
4407 | jflags |= JM_PREFIX; | |
4408 | job = get_job_by_name (words->word->word, jflags); | |
4409 | if (job != NO_JOB) | |
726f6388 | 4410 | { |
7117c2d2 JA |
4411 | run_unwind_frame ("simple-command"); |
4412 | this_command_name = "fg"; | |
4413 | last_shell_builtin = this_shell_builtin; | |
4414 | this_shell_builtin = builtin_address ("fg"); | |
ccc6cda3 | 4415 | |
7117c2d2 JA |
4416 | started_status = start_job (job, 1); |
4417 | return ((started_status < 0) ? EXECUTION_FAILURE : started_status); | |
726f6388 | 4418 | } |
ccc6cda3 JA |
4419 | } |
4420 | #endif /* JOB_CONTROL */ | |
726f6388 | 4421 | |
3185942a | 4422 | run_builtin: |
ccc6cda3 JA |
4423 | /* Remember the name of this command globally. */ |
4424 | this_command_name = words->word->word; | |
726f6388 | 4425 | |
ccc6cda3 JA |
4426 | QUIT; |
4427 | ||
4428 | /* This command could be a shell builtin or a user-defined function. | |
4429 | We have already found special builtins by this time, so we do not | |
4430 | set builtin_is_special. If this is a function or builtin, and we | |
4431 | have pipes, then fork a subshell in here. Otherwise, just execute | |
4432 | the command directly. */ | |
4433 | if (func == 0 && builtin == 0) | |
4434 | builtin = find_shell_builtin (this_command_name); | |
4435 | ||
4436 | last_shell_builtin = this_shell_builtin; | |
4437 | this_shell_builtin = builtin; | |
4438 | ||
4439 | if (builtin || func) | |
726f6388 | 4440 | { |
3185942a | 4441 | if (builtin) |
495aee44 CR |
4442 | { |
4443 | old_builtin = executing_builtin; | |
4444 | old_command_builtin = executing_command_builtin; | |
4445 | unwind_protect_int (executing_builtin); /* modified in execute_builtin */ | |
4446 | unwind_protect_int (executing_command_builtin); /* ditto */ | |
4447 | } | |
28ef6c31 | 4448 | if (already_forked) |
726f6388 | 4449 | { |
cce855bc | 4450 | /* reset_terminating_signals (); */ /* XXX */ |
495aee44 CR |
4451 | /* Reset the signal handlers in the child, but don't free the |
4452 | trap strings. Set a flag noting that we have to free the | |
4453 | trap strings if we run trap to change a signal disposition. */ | |
4454 | reset_signal_handlers (); | |
4455 | subshell_environment |= SUBSHELL_RESETTRAP; | |
726f6388 | 4456 | |
cce855bc | 4457 | if (async) |
ccc6cda3 | 4458 | { |
cce855bc JA |
4459 | if ((simple_command->flags & CMD_STDIN_REDIR) && |
4460 | pipe_in == NO_PIPE && | |
4461 | (stdin_redirects (simple_command->redirects) == 0)) | |
4462 | async_redirect_stdin (); | |
4463 | setup_async_signals (); | |
ccc6cda3 | 4464 | } |
cce855bc | 4465 | |
a0c0a00f CR |
4466 | if (async == 0) |
4467 | subshell_level++; | |
cce855bc JA |
4468 | execute_subshell_builtin_or_function |
4469 | (words, simple_command->redirects, builtin, func, | |
4470 | pipe_in, pipe_out, async, fds_to_close, | |
4471 | simple_command->flags); | |
b80f6443 | 4472 | subshell_level--; |
726f6388 JA |
4473 | } |
4474 | else | |
4475 | { | |
ccc6cda3 JA |
4476 | result = execute_builtin_or_function |
4477 | (words, builtin, func, simple_command->redirects, fds_to_close, | |
4478 | simple_command->flags); | |
4479 | if (builtin) | |
4480 | { | |
4481 | if (result > EX_SHERRBASE) | |
4482 | { | |
ac50fbac CR |
4483 | switch (result) |
4484 | { | |
4485 | case EX_REDIRFAIL: | |
4486 | case EX_BADASSIGN: | |
4487 | case EX_EXPFAIL: | |
4488 | /* These errors cause non-interactive posix mode shells to exit */ | |
4489 | if (posixly_correct && builtin_is_special && interactive_shell == 0) | |
4490 | { | |
4491 | last_command_exit_value = EXECUTION_FAILURE; | |
4492 | jump_to_top_level (ERREXIT); | |
4493 | } | |
d233b485 CR |
4494 | break; |
4495 | case EX_DISKFALLBACK: | |
4496 | /* XXX - experimental */ | |
4497 | executing_builtin = old_builtin; | |
4498 | executing_command_builtin = old_command_builtin; | |
4499 | builtin = 0; | |
4500 | /* XXX - redirections will have to be performed again */ | |
4501 | goto execute_from_filesystem; | |
ac50fbac | 4502 | } |
cce855bc JA |
4503 | result = builtin_status (result); |
4504 | if (builtin_is_special) | |
d233b485 | 4505 | special_builtin_failed = 1; /* XXX - take command builtin into account? */ |
ccc6cda3 JA |
4506 | } |
4507 | /* In POSIX mode, if there are assignment statements preceding | |
4508 | a special builtin, they persist after the builtin | |
4509 | completes. */ | |
4510 | if (posixly_correct && builtin_is_special && temporary_env) | |
4511 | merge_temporary_env (); | |
4512 | } | |
4513 | else /* function */ | |
4514 | { | |
4515 | if (result == EX_USAGE) | |
4516 | result = EX_BADUSAGE; | |
4517 | else if (result > EX_SHERRBASE) | |
cce855bc | 4518 | result = EXECUTION_FAILURE; |
ccc6cda3 JA |
4519 | } |
4520 | ||
cce855bc JA |
4521 | set_pipestatus_from_exit (result); |
4522 | ||
726f6388 JA |
4523 | goto return_result; |
4524 | } | |
4525 | } | |
726f6388 | 4526 | |
3185942a JA |
4527 | if (autocd && interactive && words->word && is_dirname (words->word->word)) |
4528 | { | |
a0c0a00f | 4529 | words = make_word_list (make_word ("--"), words); |
3185942a JA |
4530 | words = make_word_list (make_word ("cd"), words); |
4531 | xtrace_print_word_list (words, 0); | |
a0c0a00f | 4532 | func = find_function ("cd"); |
3185942a JA |
4533 | goto run_builtin; |
4534 | } | |
4535 | ||
d233b485 | 4536 | execute_from_filesystem: |
cce855bc | 4537 | if (command_line == 0) |
ac50fbac | 4538 | command_line = savestring (the_printed_command_except_trap ? the_printed_command_except_trap : ""); |
cce855bc | 4539 | |
f1be666c | 4540 | #if defined (PROCESS_SUBSTITUTION) |
a0c0a00f CR |
4541 | /* The old code did not test already_forked and only did this if |
4542 | subshell_environment&SUBSHELL_COMSUB != 0 (comsubs and procsubs). Other | |
4543 | uses of the no-fork optimization left FIFOs in $TMPDIR */ | |
4544 | if (already_forked == 0 && (simple_command->flags & CMD_NO_FORK) && fifos_pending() > 0) | |
f1be666c JA |
4545 | simple_command->flags &= ~CMD_NO_FORK; |
4546 | #endif | |
495aee44 | 4547 | result = execute_disk_command (words, simple_command->redirects, command_line, |
ccc6cda3 | 4548 | pipe_in, pipe_out, async, fds_to_close, |
d166f048 | 4549 | simple_command->flags); |
726f6388 JA |
4550 | |
4551 | return_result: | |
4552 | bind_lastarg (lastarg); | |
ccc6cda3 | 4553 | FREE (command_line); |
b80f6443 | 4554 | dispose_words (words); |
495aee44 CR |
4555 | if (builtin) |
4556 | { | |
4557 | executing_builtin = old_builtin; | |
4558 | executing_command_builtin = old_command_builtin; | |
4559 | } | |
b80f6443 JA |
4560 | discard_unwind_frame ("simple-command"); |
4561 | this_command_name = (char *)NULL; /* points to freed memory now */ | |
726f6388 JA |
4562 | return (result); |
4563 | } | |
4564 | ||
ccc6cda3 JA |
4565 | /* Translate the special builtin exit statuses. We don't really need a |
4566 | function for this; it's a placeholder for future work. */ | |
4567 | static int | |
4568 | builtin_status (result) | |
4569 | int result; | |
4570 | { | |
4571 | int r; | |
4572 | ||
4573 | switch (result) | |
4574 | { | |
4575 | case EX_USAGE: | |
4576 | r = EX_BADUSAGE; | |
4577 | break; | |
4578 | case EX_REDIRFAIL: | |
4579 | case EX_BADSYNTAX: | |
4580 | case EX_BADASSIGN: | |
4581 | case EX_EXPFAIL: | |
4582 | r = EXECUTION_FAILURE; | |
4583 | break; | |
4584 | default: | |
4585 | r = EXECUTION_SUCCESS; | |
4586 | break; | |
4587 | } | |
4588 | return (r); | |
4589 | } | |
4590 | ||
726f6388 JA |
4591 | static int |
4592 | execute_builtin (builtin, words, flags, subshell) | |
f73dda09 | 4593 | sh_builtin_func_t *builtin; |
726f6388 JA |
4594 | WORD_LIST *words; |
4595 | int flags, subshell; | |
4596 | { | |
d233b485 CR |
4597 | int result, eval_unwind, ignexit_flag; |
4598 | int isbltinenv, should_keep; | |
0001803f | 4599 | char *error_trap; |
726f6388 | 4600 | |
0001803f | 4601 | error_trap = 0; |
d233b485 | 4602 | should_keep = 0; |
a0c0a00f | 4603 | |
726f6388 JA |
4604 | /* The eval builtin calls parse_and_execute, which does not know about |
4605 | the setting of flags, and always calls the execution functions with | |
4606 | flags that will exit the shell on an error if -e is set. If the | |
4607 | eval builtin is being called, and we're supposed to ignore the exit | |
0001803f CR |
4608 | value of the command, we turn the -e flag off ourselves and disable |
4609 | the ERR trap, then restore them when the command completes. This is | |
4610 | also a problem (as below) for the command and source/. builtins. */ | |
3185942a JA |
4611 | if (subshell == 0 && (flags & CMD_IGNORE_RETURN) && |
4612 | (builtin == eval_builtin || builtin == command_builtin || builtin == source_builtin)) | |
726f6388 JA |
4613 | { |
4614 | begin_unwind_frame ("eval_builtin"); | |
4615 | unwind_protect_int (exit_immediately_on_error); | |
ac50fbac | 4616 | unwind_protect_int (builtin_ignoring_errexit); |
0001803f CR |
4617 | error_trap = TRAP_STRING (ERROR_TRAP); |
4618 | if (error_trap) | |
4619 | { | |
4620 | error_trap = savestring (error_trap); | |
4621 | add_unwind_protect (xfree, error_trap); | |
4622 | add_unwind_protect (set_error_trap, error_trap); | |
4623 | restore_default_signal (ERROR_TRAP); | |
4624 | } | |
726f6388 | 4625 | exit_immediately_on_error = 0; |
a0c0a00f | 4626 | ignexit_flag = builtin_ignoring_errexit; |
ac50fbac | 4627 | builtin_ignoring_errexit = 1; |
d166f048 | 4628 | eval_unwind = 1; |
726f6388 | 4629 | } |
d166f048 JA |
4630 | else |
4631 | eval_unwind = 0; | |
726f6388 JA |
4632 | |
4633 | /* The temporary environment for a builtin is supposed to apply to | |
4634 | all commands executed by that builtin. Currently, this is a | |
ac50fbac CR |
4635 | problem only with the `unset', `source' and `eval' builtins. |
4636 | `mapfile' is a special case because it uses evalstring (same as | |
4637 | eval or source) to run its callbacks. */ | |
d233b485 CR |
4638 | /* SHOULD_KEEP is for the pop_scope call below; it only matters when |
4639 | posixly_correct is set, but we should propagate the temporary environment | |
4640 | to the enclosing environment only for special builtins. */ | |
ac50fbac | 4641 | isbltinenv = (builtin == source_builtin || builtin == eval_builtin || builtin == unset_builtin || builtin == mapfile_builtin); |
d233b485 CR |
4642 | should_keep = isbltinenv && builtin != mapfile_builtin; |
4643 | #if defined (HISTORY) && defined (READLINE) | |
4644 | if (builtin == fc_builtin || builtin == read_builtin) | |
4645 | { | |
4646 | isbltinenv = 1; | |
4647 | should_keep = 0; | |
4648 | } | |
4649 | #endif | |
95732b49 | 4650 | |
7117c2d2 | 4651 | if (isbltinenv) |
726f6388 JA |
4652 | { |
4653 | if (subshell == 0) | |
4654 | begin_unwind_frame ("builtin_env"); | |
4655 | ||
4656 | if (temporary_env) | |
4657 | { | |
7117c2d2 | 4658 | push_scope (VC_BLTNENV, temporary_env); |
d233b485 CR |
4659 | if (flags & CMD_COMMAND_BUILTIN) |
4660 | should_keep = 0; | |
726f6388 | 4661 | if (subshell == 0) |
d233b485 | 4662 | add_unwind_protect (pop_scope, should_keep ? "1" : 0); |
7117c2d2 | 4663 | temporary_env = (HASH_TABLE *)NULL; |
726f6388 | 4664 | } |
28ef6c31 JA |
4665 | } |
4666 | ||
a0c0a00f CR |
4667 | if (subshell == 0 && builtin == eval_builtin) |
4668 | { | |
4669 | if (evalnest_max > 0 && evalnest >= evalnest_max) | |
4670 | { | |
4671 | internal_error (_("eval: maximum eval nesting level exceeded (%d)"), evalnest); | |
4672 | evalnest = 0; | |
4673 | jump_to_top_level (DISCARD); | |
4674 | } | |
4675 | unwind_protect_int (evalnest); | |
4676 | /* The test for subshell == 0 above doesn't make a difference */ | |
4677 | evalnest++; /* execute_subshell_builtin_or_function sets this to 0 */ | |
4678 | } | |
4679 | else if (subshell == 0 && builtin == source_builtin) | |
4680 | { | |
4681 | if (sourcenest_max > 0 && sourcenest >= sourcenest_max) | |
4682 | { | |
4683 | internal_error (_("%s: maximum source nesting level exceeded (%d)"), this_command_name, sourcenest); | |
4684 | sourcenest = 0; | |
4685 | jump_to_top_level (DISCARD); | |
4686 | } | |
4687 | unwind_protect_int (sourcenest); | |
4688 | /* The test for subshell == 0 above doesn't make a difference */ | |
4689 | sourcenest++; /* execute_subshell_builtin_or_function sets this to 0 */ | |
4690 | } | |
4691 | ||
28ef6c31 JA |
4692 | /* `return' does a longjmp() back to a saved environment in execute_function. |
4693 | If a variable assignment list preceded the command, and the shell is | |
4694 | running in POSIX mode, we need to merge that into the shell_variables | |
d233b485 CR |
4695 | table, since `return' is a POSIX special builtin. We don't do this if |
4696 | it's being run by the `command' builtin, since that's supposed to inhibit | |
4697 | the special builtin properties. */ | |
4698 | if (posixly_correct && subshell == 0 && builtin == return_builtin && (flags & CMD_COMMAND_BUILTIN) == 0 && temporary_env) | |
28ef6c31 JA |
4699 | { |
4700 | begin_unwind_frame ("return_temp_env"); | |
4701 | add_unwind_protect (merge_temporary_env, (char *)NULL); | |
726f6388 JA |
4702 | } |
4703 | ||
3185942a | 4704 | executing_builtin++; |
495aee44 | 4705 | executing_command_builtin |= builtin == command_builtin; |
726f6388 JA |
4706 | result = ((*builtin) (words->next)); |
4707 | ||
28ef6c31 JA |
4708 | /* This shouldn't happen, but in case `return' comes back instead of |
4709 | longjmp'ing, we need to unwind. */ | |
4710 | if (posixly_correct && subshell == 0 && builtin == return_builtin && temporary_env) | |
4711 | discard_unwind_frame ("return_temp_env"); | |
4712 | ||
7117c2d2 JA |
4713 | if (subshell == 0 && isbltinenv) |
4714 | run_unwind_frame ("builtin_env"); | |
726f6388 | 4715 | |
d166f048 | 4716 | if (eval_unwind) |
726f6388 | 4717 | { |
a0c0a00f CR |
4718 | builtin_ignoring_errexit = ignexit_flag; |
4719 | exit_immediately_on_error = builtin_ignoring_errexit ? 0 : errexit_flag; | |
0001803f CR |
4720 | if (error_trap) |
4721 | { | |
4722 | set_error_trap (error_trap); | |
d233b485 | 4723 | free (error_trap); |
0001803f | 4724 | } |
726f6388 JA |
4725 | discard_unwind_frame ("eval_builtin"); |
4726 | } | |
4727 | ||
4728 | return (result); | |
4729 | } | |
4730 | ||
a0c0a00f CR |
4731 | static void |
4732 | maybe_restore_getopt_state (gs) | |
4733 | sh_getopt_state_t *gs; | |
4734 | { | |
a0c0a00f CR |
4735 | /* If we have a local copy of OPTIND and it's at the right (current) |
4736 | context, then we restore getopt's internal state. If not, we just | |
4737 | let it go. We know there is a local OPTIND if gs->gs_flags & 1. | |
4738 | This is set below in execute_function() before the context is run. */ | |
4739 | if (gs->gs_flags & 1) | |
4740 | sh_getopt_restore_istate (gs); | |
4741 | else | |
4742 | free (gs); | |
4743 | } | |
4744 | ||
4745 | #if defined (ARRAY_VARS) | |
4746 | void | |
4747 | restore_funcarray_state (fa) | |
4748 | struct func_array_state *fa; | |
4749 | { | |
4750 | SHELL_VAR *nfv; | |
4751 | ARRAY *funcname_a; | |
4752 | ||
4753 | array_pop (fa->source_a); | |
4754 | array_pop (fa->lineno_a); | |
4755 | ||
4756 | GET_ARRAY_FROM_VAR ("FUNCNAME", nfv, funcname_a); | |
4757 | if (nfv == fa->funcname_v) | |
4758 | array_pop (funcname_a); | |
4759 | ||
4760 | free (fa); | |
4761 | } | |
4762 | #endif | |
4763 | ||
726f6388 JA |
4764 | static int |
4765 | execute_function (var, words, flags, fds_to_close, async, subshell) | |
4766 | SHELL_VAR *var; | |
4767 | WORD_LIST *words; | |
f73dda09 | 4768 | int flags; |
726f6388 | 4769 | struct fd_bitmap *fds_to_close; |
f73dda09 | 4770 | int async, subshell; |
726f6388 JA |
4771 | { |
4772 | int return_val, result; | |
b80f6443 JA |
4773 | COMMAND *tc, *fc, *save_current; |
4774 | char *debug_trap, *error_trap, *return_trap; | |
4775 | #if defined (ARRAY_VARS) | |
a0c0a00f | 4776 | SHELL_VAR *funcname_v, *bash_source_v, *bash_lineno_v; |
495aee44 CR |
4777 | ARRAY *funcname_a; |
4778 | volatile ARRAY *bash_source_a; | |
4779 | volatile ARRAY *bash_lineno_a; | |
a0c0a00f | 4780 | struct func_array_state *fa; |
b80f6443 JA |
4781 | #endif |
4782 | FUNCTION_DEF *shell_fn; | |
4783 | char *sfile, *t; | |
a0c0a00f CR |
4784 | sh_getopt_state_t *gs; |
4785 | SHELL_VAR *gv; | |
f73dda09 JA |
4786 | |
4787 | USE_VAR(fc); | |
726f6388 | 4788 | |
0001803f CR |
4789 | if (funcnest_max > 0 && funcnest >= funcnest_max) |
4790 | { | |
ac50fbac | 4791 | internal_error (_("%s: maximum function nesting level exceeded (%d)"), var->name, funcnest); |
495aee44 | 4792 | funcnest = 0; /* XXX - should we reset it somewhere else? */ |
0001803f CR |
4793 | jump_to_top_level (DISCARD); |
4794 | } | |
0001803f | 4795 | |
b80f6443 JA |
4796 | #if defined (ARRAY_VARS) |
4797 | GET_ARRAY_FROM_VAR ("FUNCNAME", funcname_v, funcname_a); | |
4798 | GET_ARRAY_FROM_VAR ("BASH_SOURCE", bash_source_v, bash_source_a); | |
4799 | GET_ARRAY_FROM_VAR ("BASH_LINENO", bash_lineno_v, bash_lineno_a); | |
4800 | #endif | |
4801 | ||
726f6388 JA |
4802 | tc = (COMMAND *)copy_command (function_cell (var)); |
4803 | if (tc && (flags & CMD_IGNORE_RETURN)) | |
4804 | tc->flags |= CMD_IGNORE_RETURN; | |
4805 | ||
a0c0a00f | 4806 | gs = sh_getopt_save_istate (); |
726f6388 JA |
4807 | if (subshell == 0) |
4808 | { | |
ccc6cda3 | 4809 | begin_unwind_frame ("function_calling"); |
d233b485 CR |
4810 | /* If the shell is in posix mode, this will push the variables in |
4811 | the temporary environment to the "current shell environment" (the | |
4812 | global scope), and dispose the temporary env before setting it to | |
4813 | NULL later. This behavior has disappeared from the latest edition | |
4814 | of the standard, so I will eventually remove it from variables.c: | |
4815 | push_var_context. */ | |
7117c2d2 | 4816 | push_context (var->name, subshell, temporary_env); |
a0c0a00f CR |
4817 | /* This has to be before the pop_context(), because the unwinding of |
4818 | local variables may cause the restore of a local declaration of | |
4819 | OPTIND to force a getopts state reset. */ | |
4820 | add_unwind_protect (maybe_restore_getopt_state, gs); | |
726f6388 JA |
4821 | add_unwind_protect (pop_context, (char *)NULL); |
4822 | unwind_protect_int (line_number); | |
a0c0a00f CR |
4823 | unwind_protect_int (line_number_for_err_trap); |
4824 | unwind_protect_int (function_line_number); | |
ccc6cda3 JA |
4825 | unwind_protect_int (return_catch_flag); |
4826 | unwind_protect_jmp_buf (return_catch); | |
4827 | add_unwind_protect (dispose_command, (char *)tc); | |
bb70624e | 4828 | unwind_protect_pointer (this_shell_function); |
0001803f | 4829 | unwind_protect_int (funcnest); |
a0c0a00f | 4830 | unwind_protect_int (loop_level); |
726f6388 | 4831 | } |
7117c2d2 JA |
4832 | else |
4833 | push_context (var->name, subshell, temporary_env); /* don't unwind-protect for subshells */ | |
4834 | ||
4835 | temporary_env = (HASH_TABLE *)NULL; | |
726f6388 | 4836 | |
bb70624e JA |
4837 | this_shell_function = var; |
4838 | make_funcname_visible (1); | |
4839 | ||
f73dda09 JA |
4840 | debug_trap = TRAP_STRING(DEBUG_TRAP); |
4841 | error_trap = TRAP_STRING(ERROR_TRAP); | |
b80f6443 | 4842 | return_trap = TRAP_STRING(RETURN_TRAP); |
f73dda09 | 4843 | |
b80f6443 JA |
4844 | /* The order of the unwind protects for debug_trap, error_trap and |
4845 | return_trap is important here! unwind-protect commands are run | |
4846 | in reverse order of registration. If this causes problems, take | |
4847 | out the xfree unwind-protect calls and live with the small memory leak. */ | |
4848 | ||
4849 | /* function_trace_mode != 0 means that all functions inherit the DEBUG trap. | |
4850 | if the function has the trace attribute set, it inherits the DEBUG trap */ | |
4851 | if (debug_trap && ((trace_p (var) == 0) && function_trace_mode == 0)) | |
ccc6cda3 JA |
4852 | { |
4853 | if (subshell == 0) | |
4854 | { | |
4855 | debug_trap = savestring (debug_trap); | |
cce855bc | 4856 | add_unwind_protect (xfree, debug_trap); |
a0c0a00f | 4857 | add_unwind_protect (maybe_set_debug_trap, debug_trap); |
ccc6cda3 JA |
4858 | } |
4859 | restore_default_signal (DEBUG_TRAP); | |
4860 | } | |
726f6388 | 4861 | |
b80f6443 JA |
4862 | /* error_trace_mode != 0 means that functions inherit the ERR trap. */ |
4863 | if (error_trap && error_trace_mode == 0) | |
f73dda09 JA |
4864 | { |
4865 | if (subshell == 0) | |
4866 | { | |
4867 | error_trap = savestring (error_trap); | |
4868 | add_unwind_protect (xfree, error_trap); | |
a0c0a00f | 4869 | add_unwind_protect (maybe_set_error_trap, error_trap); |
f73dda09 JA |
4870 | } |
4871 | restore_default_signal (ERROR_TRAP); | |
4872 | } | |
4873 | ||
95732b49 JA |
4874 | /* Shell functions inherit the RETURN trap if function tracing is on |
4875 | globally or on individually for this function. */ | |
95732b49 | 4876 | if (return_trap && (signal_in_progress (DEBUG_TRAP) || ((trace_p (var) == 0) && function_trace_mode == 0))) |
b80f6443 JA |
4877 | { |
4878 | if (subshell == 0) | |
4879 | { | |
4880 | return_trap = savestring (return_trap); | |
4881 | add_unwind_protect (xfree, return_trap); | |
a0c0a00f | 4882 | add_unwind_protect (maybe_set_return_trap, return_trap); |
b80f6443 JA |
4883 | } |
4884 | restore_default_signal (RETURN_TRAP); | |
4885 | } | |
4886 | ||
4887 | funcnest++; | |
4888 | #if defined (ARRAY_VARS) | |
4889 | /* This is quite similar to the code in shell.c and elsewhere. */ | |
4890 | shell_fn = find_function_def (this_shell_function->name); | |
4891 | sfile = shell_fn ? shell_fn->source_file : ""; | |
ac50fbac | 4892 | array_push ((ARRAY *)funcname_a, this_shell_function->name); |
b80f6443 | 4893 | |
ac50fbac | 4894 | array_push ((ARRAY *)bash_source_a, sfile); |
b80f6443 | 4895 | t = itos (executing_line_number ()); |
ac50fbac | 4896 | array_push ((ARRAY *)bash_lineno_a, t); |
b80f6443 JA |
4897 | free (t); |
4898 | #endif | |
4899 | ||
a0c0a00f CR |
4900 | #if defined (ARRAY_VARS) |
4901 | fa = (struct func_array_state *)xmalloc (sizeof (struct func_array_state)); | |
4902 | fa->source_a = (ARRAY *)bash_source_a; | |
4903 | fa->source_v = bash_source_v; | |
4904 | fa->lineno_a = (ARRAY *)bash_lineno_a; | |
4905 | fa->lineno_v = bash_lineno_v; | |
4906 | fa->funcname_a = (ARRAY *)funcname_a; | |
4907 | fa->funcname_v = funcname_v; | |
4908 | if (subshell == 0) | |
4909 | add_unwind_protect (restore_funcarray_state, fa); | |
4910 | #endif | |
4911 | ||
726f6388 JA |
4912 | /* The temporary environment for a function is supposed to apply to |
4913 | all commands executed within the function body. */ | |
726f6388 | 4914 | |
d233b485 CR |
4915 | /* Initialize BASH_ARGC and BASH_ARGV before we blow away the positional |
4916 | parameters */ | |
4917 | if (debugging_mode || shell_compatibility_level <= 44) | |
4918 | init_bash_argv (); | |
4919 | ||
726f6388 JA |
4920 | remember_args (words->next, 1); |
4921 | ||
b80f6443 JA |
4922 | /* Update BASH_ARGV and BASH_ARGC */ |
4923 | if (debugging_mode) | |
a0c0a00f CR |
4924 | { |
4925 | push_args (words->next); | |
4926 | if (subshell == 0) | |
4927 | add_unwind_protect (pop_args, 0); | |
4928 | } | |
b80f6443 | 4929 | |
ccc6cda3 | 4930 | /* Number of the line on which the function body starts. */ |
b80f6443 | 4931 | line_number = function_line_number = tc->line; |
726f6388 | 4932 | |
726f6388 | 4933 | #if defined (JOB_CONTROL) |
95732b49 JA |
4934 | if (subshell) |
4935 | stop_pipeline (async, (COMMAND *)NULL); | |
726f6388 | 4936 | #endif |
726f6388 | 4937 | |
a0c0a00f CR |
4938 | if (shell_compatibility_level > 43) |
4939 | loop_level = 0; | |
4940 | ||
95732b49 | 4941 | fc = tc; |
726f6388 | 4942 | |
a0c0a00f CR |
4943 | from_return_trap = 0; |
4944 | ||
726f6388 | 4945 | return_catch_flag++; |
ac50fbac | 4946 | return_val = setjmp_nosigs (return_catch); |
726f6388 JA |
4947 | |
4948 | if (return_val) | |
95732b49 JA |
4949 | { |
4950 | result = return_catch_value; | |
4951 | /* Run the RETURN trap in the function's context. */ | |
4952 | save_current = currently_executing_command; | |
a0c0a00f CR |
4953 | if (from_return_trap == 0) |
4954 | run_return_trap (); | |
95732b49 JA |
4955 | currently_executing_command = save_current; |
4956 | } | |
726f6388 | 4957 | else |
b80f6443 JA |
4958 | { |
4959 | /* Run the debug trap here so we can trap at the start of a function's | |
4960 | execution rather than the execution of the body's first command. */ | |
4961 | showing_function_line = 1; | |
4962 | save_current = currently_executing_command; | |
4963 | result = run_debug_trap (); | |
4964 | #if defined (DEBUGGER) | |
4965 | /* In debugging mode, if the DEBUG trap returns a non-zero status, we | |
4966 | skip the command. */ | |
4967 | if (debugging_mode == 0 || result == EXECUTION_SUCCESS) | |
4968 | { | |
4969 | showing_function_line = 0; | |
4970 | currently_executing_command = save_current; | |
4971 | result = execute_command_internal (fc, 0, NO_PIPE, NO_PIPE, fds_to_close); | |
4972 | ||
4973 | /* Run the RETURN trap in the function's context */ | |
4974 | save_current = currently_executing_command; | |
4975 | run_return_trap (); | |
4976 | currently_executing_command = save_current; | |
4977 | } | |
4978 | #else | |
4979 | result = execute_command_internal (fc, 0, NO_PIPE, NO_PIPE, fds_to_close); | |
95732b49 JA |
4980 | |
4981 | save_current = currently_executing_command; | |
4982 | run_return_trap (); | |
4983 | currently_executing_command = save_current; | |
b80f6443 JA |
4984 | #endif |
4985 | showing_function_line = 0; | |
4986 | } | |
4987 | ||
a0c0a00f CR |
4988 | /* If we have a local copy of OPTIND, note it in the saved getopts state. */ |
4989 | gv = find_variable ("OPTIND"); | |
4990 | if (gv && gv->context == variable_context) | |
4991 | gs->gs_flags |= 1; | |
726f6388 | 4992 | |
ccc6cda3 | 4993 | if (subshell == 0) |
726f6388 | 4994 | run_unwind_frame ("function_calling"); |
b80f6443 | 4995 | #if defined (ARRAY_VARS) |
a0c0a00f CR |
4996 | else |
4997 | { | |
4998 | restore_funcarray_state (fa); | |
4999 | /* Restore BASH_ARGC and BASH_ARGV */ | |
5000 | if (debugging_mode) | |
5001 | pop_args (); | |
5002 | } | |
b80f6443 | 5003 | #endif |
a0c0a00f | 5004 | |
bb70624e | 5005 | if (variable_context == 0 || this_shell_function == 0) |
0001803f CR |
5006 | { |
5007 | make_funcname_visible (0); | |
5008 | #if defined (PROCESS_SUBSTITUTION) | |
5009 | unlink_fifo_list (); | |
5010 | #endif | |
5011 | } | |
a0c0a00f | 5012 | |
726f6388 JA |
5013 | return (result); |
5014 | } | |
5015 | ||
bb70624e JA |
5016 | /* A convenience routine for use by other parts of the shell to execute |
5017 | a particular shell function. */ | |
5018 | int | |
5019 | execute_shell_function (var, words) | |
5020 | SHELL_VAR *var; | |
5021 | WORD_LIST *words; | |
5022 | { | |
5023 | int ret; | |
5024 | struct fd_bitmap *bitmap; | |
5025 | ||
5026 | bitmap = new_fd_bitmap (FD_BITMAP_DEFAULT_SIZE); | |
5027 | begin_unwind_frame ("execute-shell-function"); | |
5028 | add_unwind_protect (dispose_fd_bitmap, (char *)bitmap); | |
5029 | ||
5030 | ret = execute_function (var, words, 0, bitmap, 0, 0); | |
5031 | ||
5032 | dispose_fd_bitmap (bitmap); | |
5033 | discard_unwind_frame ("execute-shell-function"); | |
5034 | ||
5035 | return ret; | |
5036 | } | |
5037 | ||
726f6388 JA |
5038 | /* Execute a shell builtin or function in a subshell environment. This |
5039 | routine does not return; it only calls exit(). If BUILTIN is non-null, | |
5040 | it points to a function to call to execute a shell builtin; otherwise | |
5041 | VAR points at the body of a function to execute. WORDS is the arguments | |
5042 | to the command, REDIRECTS specifies redirections to perform before the | |
5043 | command is executed. */ | |
5044 | static void | |
5045 | execute_subshell_builtin_or_function (words, redirects, builtin, var, | |
5046 | pipe_in, pipe_out, async, fds_to_close, | |
5047 | flags) | |
5048 | WORD_LIST *words; | |
5049 | REDIRECT *redirects; | |
f73dda09 | 5050 | sh_builtin_func_t *builtin; |
726f6388 JA |
5051 | SHELL_VAR *var; |
5052 | int pipe_in, pipe_out, async; | |
5053 | struct fd_bitmap *fds_to_close; | |
5054 | int flags; | |
5055 | { | |
0628567a | 5056 | int result, r, funcvalue; |
bb70624e JA |
5057 | #if defined (JOB_CONTROL) |
5058 | int jobs_hack; | |
726f6388 | 5059 | |
b72432fd JA |
5060 | jobs_hack = (builtin == jobs_builtin) && |
5061 | ((subshell_environment & SUBSHELL_ASYNC) == 0 || pipe_out != NO_PIPE); | |
bb70624e JA |
5062 | #endif |
5063 | ||
5064 | /* A subshell is neither a login shell nor interactive. */ | |
5065 | login_shell = interactive = 0; | |
a0c0a00f CR |
5066 | if (builtin == eval_builtin) |
5067 | evalnest = 0; | |
5068 | else if (builtin == source_builtin) | |
5069 | sourcenest = 0; | |
b72432fd | 5070 | |
0628567a JA |
5071 | if (async) |
5072 | subshell_environment |= SUBSHELL_ASYNC; | |
5073 | if (pipe_in != NO_PIPE || pipe_out != NO_PIPE) | |
5074 | subshell_environment |= SUBSHELL_PIPE; | |
726f6388 | 5075 | |
ccc6cda3 | 5076 | maybe_make_export_env (); /* XXX - is this needed? */ |
726f6388 JA |
5077 | |
5078 | #if defined (JOB_CONTROL) | |
5079 | /* Eradicate all traces of job control after we fork the subshell, so | |
5080 | all jobs begun by this subshell are in the same process group as | |
5081 | the shell itself. */ | |
5082 | ||
5083 | /* Allow the output of `jobs' to be piped. */ | |
b72432fd | 5084 | if (jobs_hack) |
726f6388 JA |
5085 | kill_current_pipeline (); |
5086 | else | |
5087 | without_job_control (); | |
5088 | ||
5089 | set_sigchld_handler (); | |
d233b485 CR |
5090 | #else |
5091 | without_job_control (); | |
726f6388 JA |
5092 | #endif /* JOB_CONTROL */ |
5093 | ||
5094 | set_sigint_handler (); | |
5095 | ||
726f6388 JA |
5096 | if (fds_to_close) |
5097 | close_fd_bitmap (fds_to_close); | |
5098 | ||
bb70624e JA |
5099 | do_piping (pipe_in, pipe_out); |
5100 | ||
b80f6443 | 5101 | if (do_redirections (redirects, RX_ACTIVE) != 0) |
726f6388 JA |
5102 | exit (EXECUTION_FAILURE); |
5103 | ||
5104 | if (builtin) | |
5105 | { | |
726f6388 JA |
5106 | /* Give builtins a place to jump back to on failure, |
5107 | so we don't go back up to main(). */ | |
ac50fbac | 5108 | result = setjmp_nosigs (top_level); |
726f6388 | 5109 | |
0628567a JA |
5110 | /* Give the return builtin a place to jump to when executed in a subshell |
5111 | or pipeline */ | |
5112 | funcvalue = 0; | |
5113 | if (return_catch_flag && builtin == return_builtin) | |
ac50fbac | 5114 | funcvalue = setjmp_nosigs (return_catch); |
0628567a | 5115 | |
726f6388 JA |
5116 | if (result == EXITPROG) |
5117 | exit (last_command_exit_value); | |
5118 | else if (result) | |
5119 | exit (EXECUTION_FAILURE); | |
0628567a JA |
5120 | else if (funcvalue) |
5121 | exit (return_catch_value); | |
726f6388 | 5122 | else |
cce855bc JA |
5123 | { |
5124 | r = execute_builtin (builtin, words, flags, 1); | |
3185942a | 5125 | fflush (stdout); |
cce855bc JA |
5126 | if (r == EX_USAGE) |
5127 | r = EX_BADUSAGE; | |
d233b485 CR |
5128 | /* XXX - experimental */ |
5129 | else if (r == EX_DISKFALLBACK) | |
5130 | { | |
5131 | char *command_line; | |
5132 | ||
5133 | command_line = savestring (the_printed_command_except_trap ? the_printed_command_except_trap : ""); | |
5134 | r = execute_disk_command (words, (REDIRECT *)0, command_line, | |
5135 | -1, -1, async, (struct fd_bitmap *)0, flags|CMD_NO_FORK); | |
5136 | } | |
a0c0a00f | 5137 | sh_exit (r); |
cce855bc | 5138 | } |
726f6388 JA |
5139 | } |
5140 | else | |
3185942a JA |
5141 | { |
5142 | r = execute_function (var, words, flags, fds_to_close, async, 1); | |
5143 | fflush (stdout); | |
a0c0a00f | 5144 | sh_exit (r); |
3185942a | 5145 | } |
726f6388 JA |
5146 | } |
5147 | ||
5148 | /* Execute a builtin or function in the current shell context. If BUILTIN | |
5149 | is non-null, it is the builtin command to execute, otherwise VAR points | |
5150 | to the body of a function. WORDS are the command's arguments, REDIRECTS | |
5151 | are the redirections to perform. FDS_TO_CLOSE is the usual bitmap of | |
5152 | file descriptors to close. | |
5153 | ||
5154 | If BUILTIN is exec_builtin, the redirections specified in REDIRECTS are | |
5155 | not undone before this function returns. */ | |
5156 | static int | |
5157 | execute_builtin_or_function (words, builtin, var, redirects, | |
5158 | fds_to_close, flags) | |
5159 | WORD_LIST *words; | |
f73dda09 | 5160 | sh_builtin_func_t *builtin; |
726f6388 JA |
5161 | SHELL_VAR *var; |
5162 | REDIRECT *redirects; | |
5163 | struct fd_bitmap *fds_to_close; | |
5164 | int flags; | |
5165 | { | |
ccc6cda3 | 5166 | int result; |
726f6388 | 5167 | REDIRECT *saved_undo_list; |
495aee44 CR |
5168 | #if defined (PROCESS_SUBSTITUTION) |
5169 | int ofifo, nfifo, osize; | |
5170 | char *ofifo_list; | |
5171 | #endif | |
5172 | ||
2fb21d75 CR |
5173 | #if defined (PROCESS_SUBSTITUTION) |
5174 | begin_unwind_frame ("saved_fifos"); | |
5175 | /* If we return, we longjmp and don't get a chance to restore the old | |
5176 | fifo list, so we add an unwind protect to free it */ | |
495aee44 CR |
5177 | ofifo = num_fifos (); |
5178 | ofifo_list = copy_fifo_list (&osize); | |
2fb21d75 CR |
5179 | if (ofifo_list) |
5180 | add_unwind_protect (xfree, ofifo_list); | |
495aee44 | 5181 | #endif |
726f6388 | 5182 | |
b80f6443 | 5183 | if (do_redirections (redirects, RX_ACTIVE|RX_UNDOABLE) != 0) |
726f6388 | 5184 | { |
d233b485 | 5185 | undo_partial_redirects (); |
726f6388 | 5186 | dispose_exec_redirects (); |
495aee44 CR |
5187 | #if defined (PROCESS_SUBSTITUTION) |
5188 | free (ofifo_list); | |
5189 | #endif | |
ccc6cda3 | 5190 | return (EX_REDIRFAIL); /* was EXECUTION_FAILURE */ |
726f6388 JA |
5191 | } |
5192 | ||
5193 | saved_undo_list = redirection_undo_list; | |
5194 | ||
5195 | /* Calling the "exec" builtin changes redirections forever. */ | |
5196 | if (builtin == exec_builtin) | |
5197 | { | |
5198 | dispose_redirects (saved_undo_list); | |
5199 | saved_undo_list = exec_redirection_undo_list; | |
5200 | exec_redirection_undo_list = (REDIRECT *)NULL; | |
5201 | } | |
5202 | else | |
5203 | dispose_exec_redirects (); | |
5204 | ||
5205 | if (saved_undo_list) | |
5206 | { | |
a0c0a00f | 5207 | begin_unwind_frame ("saved-redirects"); |
ccc6cda3 | 5208 | add_unwind_protect (cleanup_redirects, (char *)saved_undo_list); |
726f6388 JA |
5209 | } |
5210 | ||
5211 | redirection_undo_list = (REDIRECT *)NULL; | |
5212 | ||
5213 | if (builtin) | |
5214 | result = execute_builtin (builtin, words, flags, 0); | |
5215 | else | |
5216 | result = execute_function (var, words, flags, fds_to_close, 0, 0); | |
5217 | ||
b80f6443 | 5218 | /* We do this before undoing the effects of any redirections. */ |
3185942a JA |
5219 | fflush (stdout); |
5220 | fpurge (stdout); | |
b80f6443 JA |
5221 | if (ferror (stdout)) |
5222 | clearerr (stdout); | |
5223 | ||
28ef6c31 JA |
5224 | /* If we are executing the `command' builtin, but this_shell_builtin is |
5225 | set to `exec_builtin', we know that we have something like | |
5226 | `command exec [redirection]', since otherwise `exec' would have | |
5227 | overwritten the shell and we wouldn't get here. In this case, we | |
5228 | want to behave as if the `command' builtin had not been specified | |
5229 | and preserve the redirections. */ | |
5230 | if (builtin == command_builtin && this_shell_builtin == exec_builtin) | |
5231 | { | |
495aee44 CR |
5232 | int discard; |
5233 | ||
5234 | discard = 0; | |
28ef6c31 | 5235 | if (saved_undo_list) |
495aee44 CR |
5236 | { |
5237 | dispose_redirects (saved_undo_list); | |
5238 | discard = 1; | |
5239 | } | |
28ef6c31 JA |
5240 | redirection_undo_list = exec_redirection_undo_list; |
5241 | saved_undo_list = exec_redirection_undo_list = (REDIRECT *)NULL; | |
495aee44 | 5242 | if (discard) |
a0c0a00f | 5243 | discard_unwind_frame ("saved-redirects"); |
28ef6c31 JA |
5244 | } |
5245 | ||
726f6388 JA |
5246 | if (saved_undo_list) |
5247 | { | |
5248 | redirection_undo_list = saved_undo_list; | |
a0c0a00f | 5249 | discard_unwind_frame ("saved-redirects"); |
726f6388 JA |
5250 | } |
5251 | ||
d233b485 | 5252 | undo_partial_redirects (); |
726f6388 | 5253 | |
495aee44 CR |
5254 | #if defined (PROCESS_SUBSTITUTION) |
5255 | /* Close any FIFOs created by this builtin or function. */ | |
5256 | nfifo = num_fifos (); | |
5257 | if (nfifo > ofifo) | |
5258 | close_new_fifos (ofifo_list, osize); | |
2fb21d75 CR |
5259 | if (ofifo_list) |
5260 | free (ofifo_list); | |
5261 | discard_unwind_frame ("saved_fifos"); | |
495aee44 CR |
5262 | #endif |
5263 | ||
726f6388 JA |
5264 | return (result); |
5265 | } | |
5266 | ||
5267 | void | |
5268 | setup_async_signals () | |
5269 | { | |
b72432fd JA |
5270 | #if defined (__BEOS__) |
5271 | set_signal_handler (SIGHUP, SIG_IGN); /* they want csh-like behavior */ | |
5272 | #endif | |
5273 | ||
726f6388 JA |
5274 | #if defined (JOB_CONTROL) |
5275 | if (job_control == 0) | |
5276 | #endif | |
5277 | { | |
ac50fbac CR |
5278 | /* Make sure we get the original signal dispositions now so we don't |
5279 | confuse the trap builtin later if the subshell tries to use it to | |
5280 | reset SIGINT/SIGQUIT. Don't call set_signal_ignored; that sets | |
5281 | the value of original_signals to SIG_IGN. Posix interpretation 751. */ | |
5282 | get_original_signal (SIGINT); | |
726f6388 | 5283 | set_signal_handler (SIGINT, SIG_IGN); |
ac50fbac CR |
5284 | |
5285 | get_original_signal (SIGQUIT); | |
726f6388 | 5286 | set_signal_handler (SIGQUIT, SIG_IGN); |
726f6388 JA |
5287 | } |
5288 | } | |
5289 | ||
5290 | /* Execute a simple command that is hopefully defined in a disk file | |
5291 | somewhere. | |
5292 | ||
5293 | 1) fork () | |
5294 | 2) connect pipes | |
5295 | 3) look up the command | |
5296 | 4) do redirections | |
5297 | 5) execve () | |
5298 | 6) If the execve failed, see if the file has executable mode set. | |
5299 | If so, and it isn't a directory, then execute its contents as | |
5300 | a shell script. | |
5301 | ||
5302 | Note that the filename hashing stuff has to take place up here, | |
5303 | in the parent. This is probably why the Bourne style shells | |
5304 | don't handle it, since that would require them to go through | |
b80f6443 JA |
5305 | this gnarly hair, for no good reason. |
5306 | ||
5307 | NOTE: callers expect this to fork or exit(). */ | |
3185942a JA |
5308 | |
5309 | /* Name of a shell function to call when a command name is not found. */ | |
5310 | #ifndef NOTFOUND_HOOK | |
5311 | # define NOTFOUND_HOOK "command_not_found_handle" | |
5312 | #endif | |
5313 | ||
495aee44 | 5314 | static int |
726f6388 | 5315 | execute_disk_command (words, redirects, command_line, pipe_in, pipe_out, |
d166f048 | 5316 | async, fds_to_close, cmdflags) |
726f6388 JA |
5317 | WORD_LIST *words; |
5318 | REDIRECT *redirects; | |
5319 | char *command_line; | |
5320 | int pipe_in, pipe_out, async; | |
5321 | struct fd_bitmap *fds_to_close; | |
d166f048 | 5322 | int cmdflags; |
726f6388 | 5323 | { |
d233b485 | 5324 | char *pathname, *command, **args, *p; |
a0c0a00f | 5325 | int nofork, stdpath, result; |
bb70624e | 5326 | pid_t pid; |
3185942a JA |
5327 | SHELL_VAR *hookf; |
5328 | WORD_LIST *wl; | |
726f6388 | 5329 | |
a0c0a00f CR |
5330 | stdpath = (cmdflags & CMD_STDPATH); /* use command -p path */ |
5331 | nofork = (cmdflags & CMD_NO_FORK); /* Don't fork, just exec, if no pipes */ | |
726f6388 | 5332 | pathname = words->word->word; |
ccc6cda3 | 5333 | |
d233b485 | 5334 | p = 0; |
495aee44 | 5335 | result = EXECUTION_SUCCESS; |
726f6388 | 5336 | #if defined (RESTRICTED_SHELL) |
b80f6443 | 5337 | command = (char *)NULL; |
0001803f | 5338 | if (restricted && mbschr (pathname, '/')) |
726f6388 | 5339 | { |
b80f6443 | 5340 | internal_error (_("%s: restricted: cannot specify `/' in command names"), |
726f6388 | 5341 | pathname); |
495aee44 | 5342 | result = last_command_exit_value = EXECUTION_FAILURE; |
b80f6443 JA |
5343 | |
5344 | /* If we're not going to fork below, we must already be in a child | |
5345 | process or a context in which it's safe to call exit(2). */ | |
5346 | if (nofork && pipe_in == NO_PIPE && pipe_out == NO_PIPE) | |
5347 | exit (last_command_exit_value); | |
5348 | else | |
5349 | goto parent_return; | |
726f6388 JA |
5350 | } |
5351 | #endif /* RESTRICTED_SHELL */ | |
5352 | ||
a0c0a00f | 5353 | command = search_for_command (pathname, CMDSRCH_HASH|(stdpath ? CMDSRCH_STDPATH : 0)); |
d233b485 | 5354 | QUIT; |
726f6388 | 5355 | |
ccc6cda3 | 5356 | if (command) |
726f6388 | 5357 | { |
d233b485 CR |
5358 | /* If we're optimizing out the fork (implicit `exec'), decrement the |
5359 | shell level like `exec' would do. */ | |
5360 | if (nofork && pipe_in == NO_PIPE && pipe_out == NO_PIPE) | |
5361 | adjust_shell_level (-1); | |
5362 | ||
ccc6cda3 JA |
5363 | maybe_make_export_env (); |
5364 | put_command_name_into_env (command); | |
726f6388 JA |
5365 | } |
5366 | ||
bb70624e | 5367 | /* We have to make the child before we check for the non-existence |
726f6388 JA |
5368 | of COMMAND, since we want the error messages to be redirected. */ |
5369 | /* If we can get away without forking and there are no pipes to deal with, | |
5370 | don't bother to fork, just directly exec the command. */ | |
5371 | if (nofork && pipe_in == NO_PIPE && pipe_out == NO_PIPE) | |
5372 | pid = 0; | |
5373 | else | |
d233b485 | 5374 | pid = make_child (p = savestring (command_line), async); |
726f6388 JA |
5375 | |
5376 | if (pid == 0) | |
5377 | { | |
5378 | int old_interactive; | |
5379 | ||
495aee44 | 5380 | reset_terminating_signals (); /* XXX */ |
726f6388 JA |
5381 | /* Cancel traps, in trap.c. */ |
5382 | restore_original_signals (); | |
5383 | ||
ac50fbac CR |
5384 | CHECK_SIGTERM; |
5385 | ||
d233b485 CR |
5386 | #if defined (JOB_CONTROL) |
5387 | FREE (p); | |
5388 | #endif | |
5389 | ||
726f6388 | 5390 | /* restore_original_signals may have undone the work done |
cce855bc JA |
5391 | by make_child to ensure that SIGINT and SIGQUIT are ignored |
5392 | in asynchronous children. */ | |
726f6388 | 5393 | if (async) |
d166f048 JA |
5394 | { |
5395 | if ((cmdflags & CMD_STDIN_REDIR) && | |
5396 | pipe_in == NO_PIPE && | |
5397 | (stdin_redirects (redirects) == 0)) | |
5398 | async_redirect_stdin (); | |
5399 | setup_async_signals (); | |
5400 | } | |
726f6388 | 5401 | |
bb70624e JA |
5402 | /* This functionality is now provided by close-on-exec of the |
5403 | file descriptors manipulated by redirection and piping. | |
5404 | Some file descriptors still need to be closed in all children | |
5405 | because of the way bash does pipes; fds_to_close is a | |
5406 | bitmap of all such file descriptors. */ | |
5407 | if (fds_to_close) | |
5408 | close_fd_bitmap (fds_to_close); | |
5409 | ||
726f6388 JA |
5410 | do_piping (pipe_in, pipe_out); |
5411 | ||
f73dda09 | 5412 | old_interactive = interactive; |
726f6388 | 5413 | if (async) |
f73dda09 | 5414 | interactive = 0; |
726f6388 | 5415 | |
a0c0a00f | 5416 | subshell_environment |= SUBSHELL_FORK; /* XXX - was just = */ |
726f6388 | 5417 | |
b80f6443 | 5418 | if (redirects && (do_redirections (redirects, RX_ACTIVE) != 0)) |
726f6388 JA |
5419 | { |
5420 | #if defined (PROCESS_SUBSTITUTION) | |
5421 | /* Try to remove named pipes that may have been created as the | |
5422 | result of redirections. */ | |
5423 | unlink_fifo_list (); | |
5424 | #endif /* PROCESS_SUBSTITUTION */ | |
5425 | exit (EXECUTION_FAILURE); | |
5426 | } | |
5427 | ||
5428 | if (async) | |
5429 | interactive = old_interactive; | |
5430 | ||
ccc6cda3 | 5431 | if (command == 0) |
726f6388 | 5432 | { |
3185942a JA |
5433 | hookf = find_function (NOTFOUND_HOOK); |
5434 | if (hookf == 0) | |
5435 | { | |
495aee44 | 5436 | /* Make sure filenames are displayed using printable characters */ |
a0c0a00f | 5437 | pathname = printable_filename (pathname, 0); |
3185942a JA |
5438 | internal_error (_("%s: command not found"), pathname); |
5439 | exit (EX_NOTFOUND); /* Posix.2 says the exit status is 127 */ | |
5440 | } | |
5441 | ||
d233b485 CR |
5442 | /* We don't want to manage process groups for processes we start |
5443 | from here, so we turn off job control and don't attempt to | |
5444 | manipulate the terminal's process group. */ | |
5445 | without_job_control (); | |
5446 | ||
ac50fbac | 5447 | #if defined (JOB_CONTROL) |
d233b485 | 5448 | set_sigchld_handler (); |
ac50fbac CR |
5449 | #endif |
5450 | ||
3185942a JA |
5451 | wl = make_word_list (make_word (NOTFOUND_HOOK), words); |
5452 | exit (execute_shell_function (hookf, wl)); | |
726f6388 JA |
5453 | } |
5454 | ||
ac50fbac CR |
5455 | CHECK_SIGTERM; |
5456 | ||
ccc6cda3 JA |
5457 | /* Execve expects the command name to be in args[0]. So we |
5458 | leave it there, in the same format that the user used to | |
5459 | type it in. */ | |
7117c2d2 | 5460 | args = strvec_from_word_list (words, 0, 0, (int *)NULL); |
726f6388 JA |
5461 | exit (shell_execve (command, args, export_env)); |
5462 | } | |
5463 | else | |
5464 | { | |
b80f6443 | 5465 | parent_return: |
ac50fbac CR |
5466 | QUIT; |
5467 | ||
726f6388 JA |
5468 | /* Make sure that the pipes are closed in the parent. */ |
5469 | close_pipes (pipe_in, pipe_out); | |
5470 | #if defined (PROCESS_SUBSTITUTION) && defined (HAVE_DEV_FD) | |
d233b485 | 5471 | #if 0 |
0001803f CR |
5472 | if (variable_context == 0) |
5473 | unlink_fifo_list (); | |
d233b485 | 5474 | #endif |
726f6388 JA |
5475 | #endif |
5476 | FREE (command); | |
495aee44 | 5477 | return (result); |
726f6388 JA |
5478 | } |
5479 | } | |
5480 | ||
28ef6c31 JA |
5481 | /* CPP defines to decide whether a particular index into the #! line |
5482 | corresponds to a valid interpreter name or argument character, or | |
5483 | whitespace. The MSDOS define is to allow \r to be treated the same | |
5484 | as \n. */ | |
5485 | ||
5486 | #if !defined (MSDOS) | |
5487 | # define STRINGCHAR(ind) \ | |
f73dda09 | 5488 | (ind < sample_len && !whitespace (sample[ind]) && sample[ind] != '\n') |
28ef6c31 | 5489 | # define WHITECHAR(ind) \ |
f73dda09 | 5490 | (ind < sample_len && whitespace (sample[ind])) |
28ef6c31 JA |
5491 | #else /* MSDOS */ |
5492 | # define STRINGCHAR(ind) \ | |
f73dda09 | 5493 | (ind < sample_len && !whitespace (sample[ind]) && sample[ind] != '\n' && sample[ind] != '\r') |
28ef6c31 | 5494 | # define WHITECHAR(ind) \ |
f73dda09 | 5495 | (ind < sample_len && whitespace (sample[ind])) |
28ef6c31 JA |
5496 | #endif /* MSDOS */ |
5497 | ||
f73dda09 JA |
5498 | static char * |
5499 | getinterp (sample, sample_len, endp) | |
5500 | char *sample; | |
5501 | int sample_len, *endp; | |
726f6388 JA |
5502 | { |
5503 | register int i; | |
f73dda09 JA |
5504 | char *execname; |
5505 | int start; | |
726f6388 JA |
5506 | |
5507 | /* Find the name of the interpreter to exec. */ | |
f73dda09 | 5508 | for (i = 2; i < sample_len && whitespace (sample[i]); i++) |
726f6388 JA |
5509 | ; |
5510 | ||
28ef6c31 | 5511 | for (start = i; STRINGCHAR(i); i++) |
726f6388 JA |
5512 | ; |
5513 | ||
f73dda09 JA |
5514 | execname = substring (sample, start, i); |
5515 | ||
5516 | if (endp) | |
5517 | *endp = i; | |
5518 | return execname; | |
5519 | } | |
5520 | ||
5521 | #if !defined (HAVE_HASH_BANG_EXEC) | |
5522 | /* If the operating system on which we're running does not handle | |
5523 | the #! executable format, then help out. SAMPLE is the text read | |
5524 | from the file, SAMPLE_LEN characters. COMMAND is the name of | |
5525 | the script; it and ARGS, the arguments given by the user, will | |
5526 | become arguments to the specified interpreter. ENV is the environment | |
5527 | to pass to the interpreter. | |
5528 | ||
5529 | The word immediately following the #! is the interpreter to execute. | |
5530 | A single argument to the interpreter is allowed. */ | |
5531 | ||
5532 | static int | |
5533 | execute_shell_script (sample, sample_len, command, args, env) | |
5534 | char *sample; | |
5535 | int sample_len; | |
5536 | char *command; | |
5537 | char **args, **env; | |
5538 | { | |
5539 | char *execname, *firstarg; | |
5540 | int i, start, size_increment, larry; | |
5541 | ||
5542 | /* Find the name of the interpreter to exec. */ | |
5543 | execname = getinterp (sample, sample_len, &i); | |
726f6388 JA |
5544 | size_increment = 1; |
5545 | ||
5546 | /* Now the argument, if any. */ | |
28ef6c31 | 5547 | for (firstarg = (char *)NULL, start = i; WHITECHAR(i); i++) |
726f6388 JA |
5548 | ; |
5549 | ||
5550 | /* If there is more text on the line, then it is an argument for the | |
5551 | interpreter. */ | |
28ef6c31 JA |
5552 | |
5553 | if (STRINGCHAR(i)) | |
726f6388 | 5554 | { |
28ef6c31 | 5555 | for (start = i; STRINGCHAR(i); i++) |
726f6388 | 5556 | ; |
bb70624e | 5557 | firstarg = substring ((char *)sample, start, i); |
726f6388 JA |
5558 | size_increment = 2; |
5559 | } | |
5560 | ||
7117c2d2 JA |
5561 | larry = strvec_len (args) + size_increment; |
5562 | args = strvec_resize (args, larry + 1); | |
726f6388 JA |
5563 | |
5564 | for (i = larry - 1; i; i--) | |
5565 | args[i] = args[i - size_increment]; | |
5566 | ||
5567 | args[0] = execname; | |
5568 | if (firstarg) | |
5569 | { | |
5570 | args[1] = firstarg; | |
5571 | args[2] = command; | |
5572 | } | |
5573 | else | |
5574 | args[1] = command; | |
5575 | ||
5576 | args[larry] = (char *)NULL; | |
5577 | ||
5578 | return (shell_execve (execname, args, env)); | |
5579 | } | |
28ef6c31 JA |
5580 | #undef STRINGCHAR |
5581 | #undef WHITECHAR | |
5582 | ||
ccc6cda3 JA |
5583 | #endif /* !HAVE_HASH_BANG_EXEC */ |
5584 | ||
d166f048 JA |
5585 | static void |
5586 | initialize_subshell () | |
5587 | { | |
5588 | #if defined (ALIAS) | |
5589 | /* Forget about any aliases that we knew of. We are in a subshell. */ | |
5590 | delete_all_aliases (); | |
5591 | #endif /* ALIAS */ | |
5592 | ||
5593 | #if defined (HISTORY) | |
5594 | /* Forget about the history lines we have read. This is a non-interactive | |
5595 | subshell. */ | |
5596 | history_lines_this_session = 0; | |
5597 | #endif | |
5598 | ||
d166f048 JA |
5599 | /* Forget about the way job control was working. We are in a subshell. */ |
5600 | without_job_control (); | |
a0c0a00f CR |
5601 | |
5602 | #if defined (JOB_CONTROL) | |
d166f048 | 5603 | set_sigchld_handler (); |
95732b49 | 5604 | init_job_stats (); |
d166f048 JA |
5605 | #endif /* JOB_CONTROL */ |
5606 | ||
5607 | /* Reset the values of the shell flags and options. */ | |
5608 | reset_shell_flags (); | |
5609 | reset_shell_options (); | |
5610 | reset_shopt_options (); | |
5611 | ||
28ef6c31 JA |
5612 | /* Zero out builtin_env, since this could be a shell script run from a |
5613 | sourced file with a temporary environment supplied to the `source/.' | |
5614 | builtin. Such variables are not supposed to be exported (empirical | |
7117c2d2 JA |
5615 | testing with sh and ksh). Just throw it away; don't worry about a |
5616 | memory leak. */ | |
5617 | if (vc_isbltnenv (shell_variables)) | |
5618 | shell_variables = shell_variables->down; | |
28ef6c31 JA |
5619 | |
5620 | clear_unwind_protect_list (0); | |
f1be666c JA |
5621 | /* XXX -- are there other things we should be resetting here? */ |
5622 | parse_and_execute_level = 0; /* nothing left to restore it */ | |
28ef6c31 JA |
5623 | |
5624 | /* We're no longer inside a shell function. */ | |
a0c0a00f | 5625 | variable_context = return_catch_flag = funcnest = evalnest = sourcenest = 0; |
28ef6c31 | 5626 | |
3185942a JA |
5627 | executing_list = 0; /* XXX */ |
5628 | ||
d166f048 JA |
5629 | /* If we're not interactive, close the file descriptor from which we're |
5630 | reading the current shell script. */ | |
cce855bc | 5631 | if (interactive_shell == 0) |
b80f6443 | 5632 | unset_bash_input (0); |
d166f048 JA |
5633 | } |
5634 | ||
ccc6cda3 JA |
5635 | #if defined (HAVE_SETOSTYPE) && defined (_POSIX_SOURCE) |
5636 | # define SETOSTYPE(x) __setostype(x) | |
5637 | #else | |
5638 | # define SETOSTYPE(x) | |
5639 | #endif | |
726f6388 | 5640 | |
a0c0a00f CR |
5641 | #define HASH_BANG_BUFSIZ 128 |
5642 | ||
28ef6c31 JA |
5643 | #define READ_SAMPLE_BUF(file, buf, len) \ |
5644 | do \ | |
5645 | { \ | |
5646 | fd = open(file, O_RDONLY); \ | |
5647 | if (fd >= 0) \ | |
5648 | { \ | |
a0c0a00f | 5649 | len = read (fd, buf, HASH_BANG_BUFSIZ); \ |
28ef6c31 JA |
5650 | close (fd); \ |
5651 | } \ | |
5652 | else \ | |
5653 | len = -1; \ | |
5654 | } \ | |
5655 | while (0) | |
5656 | ||
726f6388 JA |
5657 | /* Call execve (), handling interpreting shell scripts, and handling |
5658 | exec failures. */ | |
5659 | int | |
5660 | shell_execve (command, args, env) | |
5661 | char *command; | |
5662 | char **args, **env; | |
5663 | { | |
ccc6cda3 | 5664 | int larray, i, fd; |
a0c0a00f | 5665 | char sample[HASH_BANG_BUFSIZ]; |
28ef6c31 | 5666 | int sample_len; |
ccc6cda3 JA |
5667 | |
5668 | SETOSTYPE (0); /* Some systems use for USG/POSIX semantics */ | |
726f6388 | 5669 | execve (command, args, env); |
28ef6c31 | 5670 | i = errno; /* error from execve() */ |
3185942a | 5671 | CHECK_TERMSIG; |
ccc6cda3 | 5672 | SETOSTYPE (1); |
726f6388 JA |
5673 | |
5674 | /* If we get to this point, then start checking out the file. | |
5675 | Maybe it is something we can hack ourselves. */ | |
28ef6c31 | 5676 | if (i != ENOEXEC) |
ccc6cda3 | 5677 | { |
a0c0a00f CR |
5678 | /* make sure this is set correctly for file_error/report_error */ |
5679 | last_command_exit_value = (i == ENOENT) ? EX_NOTFOUND : EX_NOEXEC; /* XXX Posix.2 says that exit status is 126 */ | |
3185942a | 5680 | if (file_isdir (command)) |
495aee44 CR |
5681 | #if defined (EISDIR) |
5682 | internal_error (_("%s: %s"), command, strerror (EISDIR)); | |
5683 | #else | |
b80f6443 | 5684 | internal_error (_("%s: is a directory"), command); |
495aee44 | 5685 | #endif |
7117c2d2 JA |
5686 | else if (executable_file (command) == 0) |
5687 | { | |
5688 | errno = i; | |
5689 | file_error (command); | |
5690 | } | |
95732b49 JA |
5691 | /* errors not involving the path argument to execve. */ |
5692 | else if (i == E2BIG || i == ENOMEM) | |
5693 | { | |
5694 | errno = i; | |
5695 | file_error (command); | |
5696 | } | |
ccc6cda3 JA |
5697 | else |
5698 | { | |
7117c2d2 JA |
5699 | /* The file has the execute bits set, but the kernel refuses to |
5700 | run it for some reason. See why. */ | |
28ef6c31 JA |
5701 | #if defined (HAVE_HASH_BANG_EXEC) |
5702 | READ_SAMPLE_BUF (command, sample, sample_len); | |
a0c0a00f CR |
5703 | if (sample_len > 0) |
5704 | sample[sample_len - 1] = '\0'; | |
28ef6c31 JA |
5705 | if (sample_len > 2 && sample[0] == '#' && sample[1] == '!') |
5706 | { | |
f73dda09 | 5707 | char *interp; |
95732b49 | 5708 | int ilen; |
f73dda09 JA |
5709 | |
5710 | interp = getinterp (sample, sample_len, (int *)NULL); | |
95732b49 | 5711 | ilen = strlen (interp); |
28ef6c31 | 5712 | errno = i; |
95732b49 JA |
5713 | if (interp[ilen - 1] == '\r') |
5714 | { | |
5715 | interp = xrealloc (interp, ilen + 2); | |
5716 | interp[ilen - 1] = '^'; | |
5717 | interp[ilen] = 'M'; | |
5718 | interp[ilen + 1] = '\0'; | |
5719 | } | |
b80f6443 | 5720 | sys_error (_("%s: %s: bad interpreter"), command, interp ? interp : ""); |
f73dda09 | 5721 | FREE (interp); |
28ef6c31 JA |
5722 | return (EX_NOEXEC); |
5723 | } | |
5724 | #endif | |
ccc6cda3 | 5725 | errno = i; |
726f6388 | 5726 | file_error (command); |
ccc6cda3 | 5727 | } |
a0c0a00f | 5728 | return (last_command_exit_value); |
ccc6cda3 | 5729 | } |
726f6388 | 5730 | |
ccc6cda3 JA |
5731 | /* This file is executable. |
5732 | If it begins with #!, then help out people with losing operating | |
5733 | systems. Otherwise, check to see if it is a binary file by seeing | |
28ef6c31 JA |
5734 | if the contents of the first line (or up to 80 characters) are in the |
5735 | ASCII set. If it's a text file, execute the contents as shell commands, | |
5736 | otherwise return 126 (EX_BINARY_FILE). */ | |
5737 | READ_SAMPLE_BUF (command, sample, sample_len); | |
ccc6cda3 | 5738 | |
28ef6c31 JA |
5739 | if (sample_len == 0) |
5740 | return (EXECUTION_SUCCESS); | |
ccc6cda3 | 5741 | |
28ef6c31 JA |
5742 | /* Is this supposed to be an executable script? |
5743 | If so, the format of the line is "#! interpreter [argument]". | |
5744 | A single argument is allowed. The BSD kernel restricts | |
5745 | the length of the entire line to 32 characters (32 bytes | |
5746 | being the size of the BSD exec header), but we allow 80 | |
5747 | characters. */ | |
5748 | if (sample_len > 0) | |
5749 | { | |
ccc6cda3 | 5750 | #if !defined (HAVE_HASH_BANG_EXEC) |
28ef6c31 JA |
5751 | if (sample_len > 2 && sample[0] == '#' && sample[1] == '!') |
5752 | return (execute_shell_script (sample, sample_len, command, args, env)); | |
5753 | else | |
ccc6cda3 | 5754 | #endif |
28ef6c31 JA |
5755 | if (check_binary_file (sample, sample_len)) |
5756 | { | |
ac50fbac | 5757 | internal_error (_("%s: cannot execute binary file: %s"), command, strerror (i)); |
a0c0a00f | 5758 | errno = i; |
28ef6c31 | 5759 | return (EX_BINARY_FILE); |
726f6388 | 5760 | } |
ccc6cda3 JA |
5761 | } |
5762 | ||
28ef6c31 JA |
5763 | /* We have committed to attempting to execute the contents of this file |
5764 | as shell commands. */ | |
5765 | ||
a0c0a00f | 5766 | reset_parser (); |
d166f048 | 5767 | initialize_subshell (); |
726f6388 | 5768 | |
ccc6cda3 | 5769 | set_sigint_handler (); |
726f6388 | 5770 | |
ccc6cda3 | 5771 | /* Insert the name of this shell into the argument list. */ |
7117c2d2 JA |
5772 | larray = strvec_len (args) + 1; |
5773 | args = strvec_resize (args, larray + 1); | |
726f6388 | 5774 | |
ccc6cda3 JA |
5775 | for (i = larray - 1; i; i--) |
5776 | args[i] = args[i - 1]; | |
726f6388 | 5777 | |
ccc6cda3 JA |
5778 | args[0] = shell_name; |
5779 | args[1] = command; | |
5780 | args[larray] = (char *)NULL; | |
726f6388 | 5781 | |
ccc6cda3 JA |
5782 | if (args[0][0] == '-') |
5783 | args[0]++; | |
726f6388 | 5784 | |
ccc6cda3 JA |
5785 | #if defined (RESTRICTED_SHELL) |
5786 | if (restricted) | |
5787 | change_flag ('r', FLAG_OFF); | |
5788 | #endif | |
726f6388 | 5789 | |
ccc6cda3 JA |
5790 | if (subshell_argv) |
5791 | { | |
5792 | /* Can't free subshell_argv[0]; that is shell_name. */ | |
5793 | for (i = 1; i < subshell_argc; i++) | |
5794 | free (subshell_argv[i]); | |
5795 | free (subshell_argv); | |
5796 | } | |
5797 | ||
5798 | dispose_command (currently_executing_command); /* XXX */ | |
5799 | currently_executing_command = (COMMAND *)NULL; | |
5800 | ||
5801 | subshell_argc = larray; | |
5802 | subshell_argv = args; | |
5803 | subshell_envp = env; | |
5804 | ||
5805 | unbind_args (); /* remove the positional parameters */ | |
5806 | ||
a0c0a00f CR |
5807 | #if defined (PROCESS_SUBSTITUTION) |
5808 | clear_fifo_list (); /* pipe fds are what they are now */ | |
5809 | #endif | |
5810 | ||
5811 | sh_longjmp (subshell_top_level, 1); | |
f73dda09 | 5812 | /*NOTREACHED*/ |
ccc6cda3 JA |
5813 | } |
5814 | ||
5815 | static int | |
ac50fbac | 5816 | execute_intern_function (name, funcdef) |
ccc6cda3 | 5817 | WORD_DESC *name; |
ac50fbac | 5818 | FUNCTION_DEF *funcdef; |
ccc6cda3 JA |
5819 | { |
5820 | SHELL_VAR *var; | |
d233b485 | 5821 | char *t; |
ccc6cda3 JA |
5822 | |
5823 | if (check_identifier (name, posixly_correct) == 0) | |
5824 | { | |
5825 | if (posixly_correct && interactive_shell == 0) | |
5826 | { | |
3185942a | 5827 | last_command_exit_value = EX_BADUSAGE; |
b80f6443 | 5828 | jump_to_top_level (ERREXIT); |
ccc6cda3 JA |
5829 | } |
5830 | return (EXECUTION_FAILURE); | |
5831 | } | |
5832 | ||
d233b485 CR |
5833 | if (strchr (name->word, CTLESC)) /* WHY? */ |
5834 | { | |
5835 | t = dequote_escapes (name->word); | |
5836 | free (name->word); | |
5837 | name->word = t; | |
5838 | } | |
5839 | ||
ac50fbac CR |
5840 | /* Posix interpretation 383 */ |
5841 | if (posixly_correct && find_special_builtin (name->word)) | |
5842 | { | |
5843 | internal_error (_("`%s': is a special builtin"), name->word); | |
5844 | last_command_exit_value = EX_BADUSAGE; | |
a0c0a00f | 5845 | jump_to_top_level (interactive_shell ? DISCARD : ERREXIT); |
ac50fbac CR |
5846 | } |
5847 | ||
ccc6cda3 | 5848 | var = find_function (name->word); |
28ef6c31 | 5849 | if (var && (readonly_p (var) || noassign_p (var))) |
ccc6cda3 | 5850 | { |
28ef6c31 | 5851 | if (readonly_p (var)) |
b80f6443 | 5852 | internal_error (_("%s: readonly function"), var->name); |
ccc6cda3 JA |
5853 | return (EXECUTION_FAILURE); |
5854 | } | |
5855 | ||
ac50fbac | 5856 | #if defined (DEBUGGER) |
d233b485 | 5857 | bind_function_def (name->word, funcdef, 1); |
ac50fbac CR |
5858 | #endif |
5859 | ||
5860 | bind_function (name->word, funcdef->command); | |
ccc6cda3 | 5861 | return (EXECUTION_SUCCESS); |
726f6388 JA |
5862 | } |
5863 | ||
d166f048 | 5864 | #if defined (INCLUDE_UNUSED) |
726f6388 | 5865 | #if defined (PROCESS_SUBSTITUTION) |
726f6388 JA |
5866 | void |
5867 | close_all_files () | |
5868 | { | |
5869 | register int i, fd_table_size; | |
5870 | ||
5871 | fd_table_size = getdtablesize (); | |
5872 | if (fd_table_size > 256) /* clamp to a reasonable value */ | |
7117c2d2 | 5873 | fd_table_size = 256; |
726f6388 JA |
5874 | |
5875 | for (i = 3; i < fd_table_size; i++) | |
5876 | close (i); | |
5877 | } | |
5878 | #endif /* PROCESS_SUBSTITUTION */ | |
d166f048 | 5879 | #endif |
726f6388 JA |
5880 | |
5881 | static void | |
5882 | close_pipes (in, out) | |
5883 | int in, out; | |
5884 | { | |
5885 | if (in >= 0) | |
5886 | close (in); | |
5887 | if (out >= 0) | |
5888 | close (out); | |
5889 | } | |
5890 | ||
b80f6443 JA |
5891 | static void |
5892 | dup_error (oldd, newd) | |
5893 | int oldd, newd; | |
5894 | { | |
5895 | sys_error (_("cannot duplicate fd %d to fd %d"), oldd, newd); | |
5896 | } | |
5897 | ||
726f6388 JA |
5898 | /* Redirect input and output to be from and to the specified pipes. |
5899 | NO_PIPE and REDIRECT_BOTH are handled correctly. */ | |
5900 | static void | |
5901 | do_piping (pipe_in, pipe_out) | |
5902 | int pipe_in, pipe_out; | |
5903 | { | |
5904 | if (pipe_in != NO_PIPE) | |
5905 | { | |
5906 | if (dup2 (pipe_in, 0) < 0) | |
b80f6443 | 5907 | dup_error (pipe_in, 0); |
726f6388 | 5908 | if (pipe_in > 0) |
cce855bc | 5909 | close (pipe_in); |
495aee44 CR |
5910 | #ifdef __CYGWIN__ |
5911 | /* Let stdio know the fd may have changed from text to binary mode. */ | |
5912 | freopen (NULL, "r", stdin); | |
5913 | #endif /* __CYGWIN__ */ | |
726f6388 JA |
5914 | } |
5915 | if (pipe_out != NO_PIPE) | |
5916 | { | |
5917 | if (pipe_out != REDIRECT_BOTH) | |
5918 | { | |
5919 | if (dup2 (pipe_out, 1) < 0) | |
b80f6443 | 5920 | dup_error (pipe_out, 1); |
726f6388 JA |
5921 | if (pipe_out == 0 || pipe_out > 1) |
5922 | close (pipe_out); | |
5923 | } | |
5924 | else | |
ccc6cda3 | 5925 | { |
cce855bc | 5926 | if (dup2 (1, 2) < 0) |
b80f6443 | 5927 | dup_error (1, 2); |
ccc6cda3 | 5928 | } |
495aee44 CR |
5929 | #ifdef __CYGWIN__ |
5930 | /* Let stdio know the fd may have changed from text to binary mode, and | |
5931 | make sure to preserve stdout line buffering. */ | |
5932 | freopen (NULL, "w", stdout); | |
5933 | sh_setlinebuf (stdout); | |
5934 | #endif /* __CYGWIN__ */ | |
d166f048 | 5935 | } |
726f6388 | 5936 | } |