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Commit | Line | Data |
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0628567a | 1 | /* execute_cmd.c -- Execute a COMMAND structure. */ |
726f6388 | 2 | |
495aee44 | 3 | /* Copyright (C) 1987-2010 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> | |
cce855bc JA |
36 | #ifndef _MINIX |
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 CR |
60 | #define NEED_FPURGE_DECL |
61 | ||
ccc6cda3 | 62 | #include "bashansi.h" |
b80f6443 | 63 | #include "bashintl.h" |
726f6388 | 64 | |
ccc6cda3 | 65 | #include "memalloc.h" |
726f6388 | 66 | #include "shell.h" |
d166f048 | 67 | #include <y.tab.h> /* use <...> so we pick it up from the build directory */ |
726f6388 | 68 | #include "flags.h" |
ccc6cda3 JA |
69 | #include "builtins.h" |
70 | #include "hashlib.h" | |
726f6388 JA |
71 | #include "jobs.h" |
72 | #include "execute_cmd.h" | |
cce855bc JA |
73 | #include "findcmd.h" |
74 | #include "redir.h" | |
ccc6cda3 JA |
75 | #include "trap.h" |
76 | #include "pathexp.h" | |
d166f048 | 77 | #include "hashcmd.h" |
726f6388 | 78 | |
cce855bc JA |
79 | #if defined (COND_COMMAND) |
80 | # include "test.h" | |
81 | #endif | |
82 | ||
726f6388 JA |
83 | #include "builtins/common.h" |
84 | #include "builtins/builtext.h" /* list of builtins */ | |
85 | ||
f73dda09 | 86 | #include <glob/strmatch.h> |
726f6388 JA |
87 | #include <tilde/tilde.h> |
88 | ||
89 | #if defined (BUFFERED_INPUT) | |
90 | # include "input.h" | |
91 | #endif | |
92 | ||
ccc6cda3 JA |
93 | #if defined (ALIAS) |
94 | # include "alias.h" | |
95 | #endif | |
96 | ||
97 | #if defined (HISTORY) | |
98 | # include "bashhist.h" | |
99 | #endif | |
100 | ||
495aee44 | 101 | extern int dollar_dollar_pid; |
726f6388 | 102 | extern int posixly_correct; |
f73dda09 | 103 | extern int expand_aliases; |
3185942a JA |
104 | extern int autocd; |
105 | extern int breaking, continuing, loop_level; | |
0001803f | 106 | extern int parse_and_execute_level, running_trap, sourcelevel; |
f73dda09 | 107 | extern int command_string_index, line_number; |
726f6388 | 108 | extern int dot_found_in_search; |
ccc6cda3 | 109 | extern int already_making_children; |
b80f6443 | 110 | extern int tempenv_assign_error; |
726f6388 JA |
111 | extern char *the_printed_command, *shell_name; |
112 | extern pid_t last_command_subst_pid; | |
f73dda09 | 113 | extern sh_builtin_func_t *last_shell_builtin, *this_shell_builtin; |
726f6388 | 114 | extern char **subshell_argv, **subshell_envp; |
ccc6cda3 | 115 | extern int subshell_argc; |
495aee44 | 116 | extern time_t shell_start_time; |
f73dda09 | 117 | #if 0 |
ccc6cda3 | 118 | extern char *glob_argv_flags; |
f73dda09 | 119 | #endif |
726f6388 | 120 | |
f73dda09 | 121 | extern int close __P((int)); |
726f6388 JA |
122 | |
123 | /* Static functions defined and used in this file. */ | |
f73dda09 JA |
124 | static void close_pipes __P((int, int)); |
125 | static void do_piping __P((int, int)); | |
126 | static void bind_lastarg __P((char *)); | |
127 | static int shell_control_structure __P((enum command_type)); | |
128 | static void cleanup_redirects __P((REDIRECT *)); | |
129 | ||
130 | #if defined (JOB_CONTROL) | |
131 | static int restore_signal_mask __P((sigset_t *)); | |
132 | #endif | |
ccc6cda3 | 133 | |
f73dda09 JA |
134 | static void async_redirect_stdin __P((void)); |
135 | ||
136 | static int builtin_status __P((int)); | |
137 | ||
138 | static int execute_for_command __P((FOR_COM *)); | |
ccc6cda3 | 139 | #if defined (SELECT_COMMAND) |
495aee44 | 140 | static int displen __P((const char *)); |
f73dda09 JA |
141 | static int print_index_and_element __P((int, int, WORD_LIST *)); |
142 | static void indent __P((int, int)); | |
143 | static void print_select_list __P((WORD_LIST *, int, int, int)); | |
7117c2d2 | 144 | static char *select_query __P((WORD_LIST *, int, char *, int)); |
f73dda09 | 145 | static int execute_select_command __P((SELECT_COM *)); |
ccc6cda3 | 146 | #endif |
cce855bc | 147 | #if defined (DPAREN_ARITHMETIC) |
f73dda09 | 148 | static int execute_arith_command __P((ARITH_COM *)); |
cce855bc JA |
149 | #endif |
150 | #if defined (COND_COMMAND) | |
f73dda09 JA |
151 | static int execute_cond_node __P((COND_COM *)); |
152 | static int execute_cond_command __P((COND_COM *)); | |
cce855bc | 153 | #endif |
d166f048 | 154 | #if defined (COMMAND_TIMING) |
f73dda09 JA |
155 | static int mkfmt __P((char *, int, int, time_t, int)); |
156 | static void print_formatted_time __P((FILE *, char *, | |
157 | time_t, int, time_t, int, | |
158 | time_t, int, int)); | |
159 | static int time_command __P((COMMAND *, int, int, int, struct fd_bitmap *)); | |
d166f048 | 160 | #endif |
bb70624e | 161 | #if defined (ARITH_FOR_COMMAND) |
7117c2d2 | 162 | static intmax_t eval_arith_for_expr __P((WORD_LIST *, int *)); |
f73dda09 | 163 | static int execute_arith_for_command __P((ARITH_FOR_COM *)); |
bb70624e | 164 | #endif |
f73dda09 JA |
165 | static int execute_case_command __P((CASE_COM *)); |
166 | static int execute_while_command __P((WHILE_COM *)); | |
167 | static int execute_until_command __P((WHILE_COM *)); | |
168 | static int execute_while_or_until __P((WHILE_COM *, int)); | |
169 | static int execute_if_command __P((IF_COM *)); | |
95732b49 | 170 | static int execute_null_command __P((REDIRECT *, int, int, int)); |
f73dda09 JA |
171 | static void fix_assignment_words __P((WORD_LIST *)); |
172 | static int execute_simple_command __P((SIMPLE_COM *, int, int, int, struct fd_bitmap *)); | |
173 | static int execute_builtin __P((sh_builtin_func_t *, WORD_LIST *, int, int)); | |
174 | static int execute_function __P((SHELL_VAR *, WORD_LIST *, int, struct fd_bitmap *, int, int)); | |
175 | static int execute_builtin_or_function __P((WORD_LIST *, sh_builtin_func_t *, | |
176 | SHELL_VAR *, | |
177 | REDIRECT *, struct fd_bitmap *, int)); | |
178 | static void execute_subshell_builtin_or_function __P((WORD_LIST *, REDIRECT *, | |
179 | sh_builtin_func_t *, | |
180 | SHELL_VAR *, | |
181 | int, int, int, | |
182 | struct fd_bitmap *, | |
183 | int)); | |
495aee44 | 184 | static int execute_disk_command __P((WORD_LIST *, REDIRECT *, char *, |
f73dda09 JA |
185 | int, int, int, struct fd_bitmap *, int)); |
186 | ||
187 | static char *getinterp __P((char *, int, int *)); | |
188 | static void initialize_subshell __P((void)); | |
189 | static int execute_in_subshell __P((COMMAND *, int, int, int, struct fd_bitmap *)); | |
3185942a JA |
190 | #if defined (COPROCESS_SUPPORT) |
191 | static int execute_coproc __P((COMMAND *, int, int, struct fd_bitmap *)); | |
192 | #endif | |
f73dda09 JA |
193 | |
194 | static int execute_pipeline __P((COMMAND *, int, int, int, struct fd_bitmap *)); | |
195 | ||
196 | static int execute_connection __P((COMMAND *, int, int, int, struct fd_bitmap *)); | |
197 | ||
198 | static int execute_intern_function __P((WORD_DESC *, COMMAND *)); | |
199 | ||
d166f048 JA |
200 | /* Set to 1 if fd 0 was the subject of redirection to a subshell. Global |
201 | so that reader_loop can set it to zero before executing a command. */ | |
202 | int stdin_redir; | |
726f6388 JA |
203 | |
204 | /* The name of the command that is currently being executed. | |
205 | `test' needs this, for example. */ | |
206 | char *this_command_name; | |
207 | ||
b80f6443 JA |
208 | /* The printed representation of the currently-executing command (same as |
209 | the_printed_command), except when a trap is being executed. Useful for | |
210 | a debugger to know where exactly the program is currently executing. */ | |
211 | char *the_printed_command_except_trap; | |
212 | ||
726f6388 | 213 | /* For catching RETURN in a function. */ |
ccc6cda3 | 214 | int return_catch_flag; |
726f6388 | 215 | int return_catch_value; |
ccc6cda3 | 216 | procenv_t return_catch; |
726f6388 JA |
217 | |
218 | /* The value returned by the last synchronous command. */ | |
ccc6cda3 | 219 | int last_command_exit_value; |
726f6388 | 220 | |
b80f6443 JA |
221 | /* Whether or not the last command (corresponding to last_command_exit_value) |
222 | was terminated by a signal, and, if so, which one. */ | |
223 | int last_command_exit_signal; | |
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 | ||
275 | static int line_number_for_err_trap; | |
276 | ||
0001803f | 277 | /* A sort of function nesting level counter */ |
495aee44 CR |
278 | int funcnest = 0; |
279 | int funcnest_max = 0; /* XXX - bash-4.2 */ | |
280 | ||
281 | int lastpipe_opt = 0; | |
0001803f | 282 | |
726f6388 JA |
283 | struct fd_bitmap *current_fds_to_close = (struct fd_bitmap *)NULL; |
284 | ||
f73dda09 | 285 | #define FD_BITMAP_DEFAULT_SIZE 32 |
d166f048 | 286 | |
726f6388 JA |
287 | /* Functions to allocate and deallocate the structures used to pass |
288 | information from the shell to its children about file descriptors | |
289 | to close. */ | |
290 | struct fd_bitmap * | |
291 | new_fd_bitmap (size) | |
f73dda09 | 292 | int size; |
726f6388 JA |
293 | { |
294 | struct fd_bitmap *ret; | |
295 | ||
296 | ret = (struct fd_bitmap *)xmalloc (sizeof (struct fd_bitmap)); | |
297 | ||
298 | ret->size = size; | |
299 | ||
300 | if (size) | |
301 | { | |
f73dda09 | 302 | ret->bitmap = (char *)xmalloc (size); |
7117c2d2 | 303 | memset (ret->bitmap, '\0', size); |
726f6388 JA |
304 | } |
305 | else | |
306 | ret->bitmap = (char *)NULL; | |
307 | return (ret); | |
308 | } | |
309 | ||
310 | void | |
311 | dispose_fd_bitmap (fdbp) | |
312 | struct fd_bitmap *fdbp; | |
313 | { | |
314 | FREE (fdbp->bitmap); | |
315 | free (fdbp); | |
316 | } | |
317 | ||
318 | void | |
319 | close_fd_bitmap (fdbp) | |
320 | struct fd_bitmap *fdbp; | |
321 | { | |
322 | register int i; | |
323 | ||
324 | if (fdbp) | |
325 | { | |
326 | for (i = 0; i < fdbp->size; i++) | |
327 | if (fdbp->bitmap[i]) | |
328 | { | |
329 | close (i); | |
330 | fdbp->bitmap[i] = 0; | |
331 | } | |
332 | } | |
333 | } | |
334 | ||
ccc6cda3 JA |
335 | /* Return the line number of the currently executing command. */ |
336 | int | |
337 | executing_line_number () | |
338 | { | |
b80f6443 JA |
339 | if (executing && showing_function_line == 0 && |
340 | (variable_context == 0 || interactive_shell == 0) && | |
341 | currently_executing_command) | |
7117c2d2 | 342 | { |
b80f6443 JA |
343 | #if defined (COND_COMMAND) |
344 | if (currently_executing_command->type == cm_cond) | |
7117c2d2 | 345 | return currently_executing_command->value.Cond->line; |
b80f6443 JA |
346 | #endif |
347 | #if defined (DPAREN_ARITHMETIC) | |
7117c2d2 JA |
348 | else if (currently_executing_command->type == cm_arith) |
349 | return currently_executing_command->value.Arith->line; | |
b80f6443 JA |
350 | #endif |
351 | #if defined (ARITH_FOR_COMMAND) | |
7117c2d2 JA |
352 | else if (currently_executing_command->type == cm_arith_for) |
353 | return currently_executing_command->value.ArithFor->line; | |
b80f6443 JA |
354 | #endif |
355 | ||
7117c2d2 JA |
356 | return line_number; |
357 | } | |
d166f048 JA |
358 | else |
359 | return line_number; | |
ccc6cda3 JA |
360 | } |
361 | ||
726f6388 JA |
362 | /* Execute the command passed in COMMAND. COMMAND is exactly what |
363 | read_command () places into GLOBAL_COMMAND. See "command.h" for the | |
364 | details of the command structure. | |
365 | ||
366 | EXECUTION_SUCCESS or EXECUTION_FAILURE are the only possible | |
367 | return values. Executing a command with nothing in it returns | |
368 | EXECUTION_SUCCESS. */ | |
ccc6cda3 | 369 | int |
726f6388 JA |
370 | execute_command (command) |
371 | COMMAND *command; | |
372 | { | |
373 | struct fd_bitmap *bitmap; | |
374 | int result; | |
375 | ||
376 | current_fds_to_close = (struct fd_bitmap *)NULL; | |
377 | bitmap = new_fd_bitmap (FD_BITMAP_DEFAULT_SIZE); | |
378 | begin_unwind_frame ("execute-command"); | |
379 | add_unwind_protect (dispose_fd_bitmap, (char *)bitmap); | |
380 | ||
381 | /* Just do the command, but not asynchronously. */ | |
382 | result = execute_command_internal (command, 0, NO_PIPE, NO_PIPE, bitmap); | |
383 | ||
384 | dispose_fd_bitmap (bitmap); | |
385 | discard_unwind_frame ("execute-command"); | |
386 | ||
387 | #if defined (PROCESS_SUBSTITUTION) | |
bb70624e JA |
388 | /* don't unlink fifos if we're in a shell function; wait until the function |
389 | returns. */ | |
390 | if (variable_context == 0) | |
391 | unlink_fifo_list (); | |
726f6388 JA |
392 | #endif /* PROCESS_SUBSTITUTION */ |
393 | ||
0628567a | 394 | QUIT; |
726f6388 JA |
395 | return (result); |
396 | } | |
397 | ||
398 | /* Return 1 if TYPE is a shell control structure type. */ | |
399 | static int | |
400 | shell_control_structure (type) | |
401 | enum command_type type; | |
402 | { | |
403 | switch (type) | |
404 | { | |
bb70624e JA |
405 | #if defined (ARITH_FOR_COMMAND) |
406 | case cm_arith_for: | |
407 | #endif | |
726f6388 JA |
408 | #if defined (SELECT_COMMAND) |
409 | case cm_select: | |
cce855bc JA |
410 | #endif |
411 | #if defined (DPAREN_ARITHMETIC) | |
412 | case cm_arith: | |
413 | #endif | |
414 | #if defined (COND_COMMAND) | |
415 | case cm_cond: | |
726f6388 JA |
416 | #endif |
417 | case cm_case: | |
418 | case cm_while: | |
419 | case cm_until: | |
420 | case cm_if: | |
95732b49 | 421 | case cm_for: |
726f6388 | 422 | case cm_group: |
95732b49 | 423 | case cm_function_def: |
726f6388 JA |
424 | return (1); |
425 | ||
426 | default: | |
427 | return (0); | |
428 | } | |
429 | } | |
430 | ||
431 | /* A function to use to unwind_protect the redirection undo list | |
432 | for loops. */ | |
433 | static void | |
434 | cleanup_redirects (list) | |
435 | REDIRECT *list; | |
436 | { | |
b80f6443 | 437 | do_redirections (list, RX_ACTIVE); |
726f6388 JA |
438 | dispose_redirects (list); |
439 | } | |
440 | ||
ccc6cda3 | 441 | #if 0 |
726f6388 JA |
442 | /* Function to unwind_protect the redirections for functions and builtins. */ |
443 | static void | |
444 | cleanup_func_redirects (list) | |
445 | REDIRECT *list; | |
446 | { | |
b80f6443 | 447 | do_redirections (list, RX_ACTIVE); |
726f6388 | 448 | } |
ccc6cda3 | 449 | #endif |
726f6388 | 450 | |
cce855bc | 451 | void |
726f6388 JA |
452 | dispose_exec_redirects () |
453 | { | |
454 | if (exec_redirection_undo_list) | |
455 | { | |
456 | dispose_redirects (exec_redirection_undo_list); | |
457 | exec_redirection_undo_list = (REDIRECT *)NULL; | |
458 | } | |
459 | } | |
460 | ||
461 | #if defined (JOB_CONTROL) | |
462 | /* A function to restore the signal mask to its proper value when the shell | |
463 | is interrupted or errors occur while creating a pipeline. */ | |
464 | static int | |
465 | restore_signal_mask (set) | |
f73dda09 | 466 | sigset_t *set; |
726f6388 | 467 | { |
f73dda09 | 468 | return (sigprocmask (SIG_SETMASK, set, (sigset_t *)NULL)); |
726f6388 JA |
469 | } |
470 | #endif /* JOB_CONTROL */ | |
471 | ||
f73dda09 | 472 | #ifdef DEBUG |
726f6388 JA |
473 | /* A debugging function that can be called from gdb, for instance. */ |
474 | void | |
475 | open_files () | |
476 | { | |
477 | register int i; | |
478 | int f, fd_table_size; | |
479 | ||
480 | fd_table_size = getdtablesize (); | |
481 | ||
f73dda09 | 482 | fprintf (stderr, "pid %ld open files:", (long)getpid ()); |
726f6388 JA |
483 | for (i = 3; i < fd_table_size; i++) |
484 | { | |
485 | if ((f = fcntl (i, F_GETFD, 0)) != -1) | |
486 | fprintf (stderr, " %d (%s)", i, f ? "close" : "open"); | |
487 | } | |
488 | fprintf (stderr, "\n"); | |
489 | } | |
f73dda09 | 490 | #endif |
726f6388 | 491 | |
d166f048 JA |
492 | static void |
493 | async_redirect_stdin () | |
494 | { | |
495 | int fd; | |
496 | ||
497 | fd = open ("/dev/null", O_RDONLY); | |
498 | if (fd > 0) | |
499 | { | |
500 | dup2 (fd, 0); | |
501 | close (fd); | |
502 | } | |
503 | else if (fd < 0) | |
b80f6443 | 504 | internal_error (_("cannot redirect standard input from /dev/null: %s"), strerror (errno)); |
d166f048 JA |
505 | } |
506 | ||
ccc6cda3 | 507 | #define DESCRIBE_PID(pid) do { if (interactive) describe_pid (pid); } while (0) |
726f6388 JA |
508 | |
509 | /* Execute the command passed in COMMAND, perhaps doing it asynchrounously. | |
510 | COMMAND is exactly what read_command () places into GLOBAL_COMMAND. | |
511 | ASYNCHROUNOUS, if non-zero, says to do this command in the background. | |
512 | PIPE_IN and PIPE_OUT are file descriptors saying where input comes | |
513 | from and where it goes. They can have the value of NO_PIPE, which means | |
514 | I/O is stdin/stdout. | |
515 | FDS_TO_CLOSE is a list of file descriptors to close once the child has | |
516 | been forked. This list often contains the unusable sides of pipes, etc. | |
517 | ||
518 | EXECUTION_SUCCESS or EXECUTION_FAILURE are the only possible | |
519 | return values. Executing a command with nothing in it returns | |
520 | EXECUTION_SUCCESS. */ | |
ccc6cda3 JA |
521 | int |
522 | execute_command_internal (command, asynchronous, pipe_in, pipe_out, | |
726f6388 JA |
523 | fds_to_close) |
524 | COMMAND *command; | |
525 | int asynchronous; | |
526 | int pipe_in, pipe_out; | |
527 | struct fd_bitmap *fds_to_close; | |
528 | { | |
17345e5a | 529 | int exec_result, user_subshell, invert, ignore_return, was_error_trap; |
d166f048 | 530 | REDIRECT *my_undo_list, *exec_undo_list; |
95732b49 | 531 | volatile int last_pid; |
b80f6443 | 532 | volatile int save_line_number; |
726f6388 | 533 | |
f1be666c | 534 | #if 0 |
ccc6cda3 | 535 | if (command == 0 || breaking || continuing || read_but_dont_execute) |
726f6388 | 536 | return (EXECUTION_SUCCESS); |
f1be666c JA |
537 | #else |
538 | if (breaking || continuing) | |
539 | return (last_command_exit_value); | |
540 | if (command == 0 || read_but_dont_execute) | |
541 | return (EXECUTION_SUCCESS); | |
542 | #endif | |
726f6388 | 543 | |
0628567a | 544 | QUIT; |
726f6388 JA |
545 | run_pending_traps (); |
546 | ||
b80f6443 | 547 | #if 0 |
ccc6cda3 | 548 | if (running_trap == 0) |
b80f6443 | 549 | #endif |
ccc6cda3 JA |
550 | currently_executing_command = command; |
551 | ||
726f6388 | 552 | invert = (command->flags & CMD_INVERT_RETURN) != 0; |
d166f048 JA |
553 | |
554 | /* If we're inverting the return value and `set -e' has been executed, | |
555 | we don't want a failing command to inadvertently cause the shell | |
556 | to exit. */ | |
557 | if (exit_immediately_on_error && invert) /* XXX */ | |
558 | command->flags |= CMD_IGNORE_RETURN; /* XXX */ | |
559 | ||
ccc6cda3 | 560 | exec_result = EXECUTION_SUCCESS; |
726f6388 JA |
561 | |
562 | /* If a command was being explicitly run in a subshell, or if it is | |
563 | a shell control-structure, and it has a pipe, then we do the command | |
564 | in a subshell. */ | |
bb70624e JA |
565 | if (command->type == cm_subshell && (command->flags & CMD_NO_FORK)) |
566 | return (execute_in_subshell (command, asynchronous, pipe_in, pipe_out, fds_to_close)); | |
726f6388 | 567 | |
3185942a JA |
568 | #if defined (COPROCESS_SUPPORT) |
569 | if (command->type == cm_coproc) | |
570 | return (execute_coproc (command, pipe_in, pipe_out, fds_to_close)); | |
571 | #endif | |
572 | ||
17345e5a JA |
573 | user_subshell = command->type == cm_subshell || ((command->flags & CMD_WANT_SUBSHELL) != 0); |
574 | ||
bb70624e JA |
575 | if (command->type == cm_subshell || |
576 | (command->flags & (CMD_WANT_SUBSHELL|CMD_FORCE_SUBSHELL)) || | |
726f6388 JA |
577 | (shell_control_structure (command->type) && |
578 | (pipe_out != NO_PIPE || pipe_in != NO_PIPE || asynchronous))) | |
579 | { | |
580 | pid_t paren_pid; | |
581 | ||
582 | /* Fork a subshell, turn off the subshell bit, turn off job | |
583 | control and call execute_command () on the command again. */ | |
89a92869 | 584 | line_number_for_err_trap = line_number; |
726f6388 JA |
585 | paren_pid = make_child (savestring (make_command_string (command)), |
586 | asynchronous); | |
587 | if (paren_pid == 0) | |
28ef6c31 JA |
588 | exit (execute_in_subshell (command, asynchronous, pipe_in, pipe_out, fds_to_close)); |
589 | /* NOTREACHED */ | |
726f6388 JA |
590 | else |
591 | { | |
592 | close_pipes (pipe_in, pipe_out); | |
593 | ||
594 | #if defined (PROCESS_SUBSTITUTION) && defined (HAVE_DEV_FD) | |
595 | unlink_fifo_list (); | |
596 | #endif | |
597 | /* If we are part of a pipeline, and not the end of the pipeline, | |
598 | then we should simply return and let the last command in the | |
599 | pipe be waited for. If we are not in a pipeline, or are the | |
ccc6cda3 | 600 | last command in the pipeline, then we wait for the subshell |
726f6388 JA |
601 | and return its exit status as usual. */ |
602 | if (pipe_out != NO_PIPE) | |
603 | return (EXECUTION_SUCCESS); | |
604 | ||
605 | stop_pipeline (asynchronous, (COMMAND *)NULL); | |
606 | ||
ccc6cda3 | 607 | if (asynchronous == 0) |
726f6388 | 608 | { |
17345e5a JA |
609 | was_error_trap = signal_is_trapped (ERROR_TRAP) && signal_is_ignored (ERROR_TRAP) == 0; |
610 | invert = (command->flags & CMD_INVERT_RETURN) != 0; | |
611 | ignore_return = (command->flags & CMD_IGNORE_RETURN) != 0; | |
612 | ||
495aee44 | 613 | exec_result = wait_for (paren_pid); |
726f6388 JA |
614 | |
615 | /* If we have to, invert the return value. */ | |
616 | if (invert) | |
495aee44 | 617 | exec_result = ((exec_result == EXECUTION_SUCCESS) |
bb70624e JA |
618 | ? EXECUTION_FAILURE |
619 | : EXECUTION_SUCCESS); | |
bb70624e | 620 | |
495aee44 | 621 | last_command_exit_value = exec_result; |
17345e5a JA |
622 | if (user_subshell && was_error_trap && ignore_return == 0 && invert == 0 && exec_result != EXECUTION_SUCCESS) |
623 | { | |
89a92869 CR |
624 | save_line_number = line_number; |
625 | line_number = line_number_for_err_trap; | |
17345e5a | 626 | run_error_trap (); |
89a92869 | 627 | line_number = save_line_number; |
17345e5a JA |
628 | } |
629 | ||
630 | if (user_subshell && ignore_return == 0 && invert == 0 && exit_immediately_on_error && exec_result != EXECUTION_SUCCESS) | |
631 | { | |
17345e5a JA |
632 | run_pending_traps (); |
633 | jump_to_top_level (ERREXIT); | |
634 | } | |
635 | ||
495aee44 | 636 | return (last_command_exit_value); |
726f6388 JA |
637 | } |
638 | else | |
639 | { | |
640 | DESCRIBE_PID (paren_pid); | |
641 | ||
642 | run_pending_traps (); | |
643 | ||
644 | return (EXECUTION_SUCCESS); | |
645 | } | |
646 | } | |
647 | } | |
648 | ||
d166f048 JA |
649 | #if defined (COMMAND_TIMING) |
650 | if (command->flags & CMD_TIME_PIPELINE) | |
651 | { | |
652 | if (asynchronous) | |
653 | { | |
654 | command->flags |= CMD_FORCE_SUBSHELL; | |
655 | exec_result = execute_command_internal (command, 1, pipe_in, pipe_out, fds_to_close); | |
656 | } | |
657 | else | |
658 | { | |
659 | exec_result = time_command (command, asynchronous, pipe_in, pipe_out, fds_to_close); | |
b80f6443 | 660 | #if 0 |
d166f048 | 661 | if (running_trap == 0) |
b80f6443 | 662 | #endif |
d166f048 JA |
663 | currently_executing_command = (COMMAND *)NULL; |
664 | } | |
665 | return (exec_result); | |
666 | } | |
667 | #endif /* COMMAND_TIMING */ | |
668 | ||
669 | if (shell_control_structure (command->type) && command->redirects) | |
670 | stdin_redir = stdin_redirects (command->redirects); | |
671 | ||
726f6388 JA |
672 | /* Handle WHILE FOR CASE etc. with redirections. (Also '&' input |
673 | redirection.) */ | |
b80f6443 | 674 | if (do_redirections (command->redirects, RX_ACTIVE|RX_UNDOABLE) != 0) |
726f6388 JA |
675 | { |
676 | cleanup_redirects (redirection_undo_list); | |
677 | redirection_undo_list = (REDIRECT *)NULL; | |
678 | dispose_exec_redirects (); | |
f1be666c | 679 | return (last_command_exit_value = EXECUTION_FAILURE); |
726f6388 JA |
680 | } |
681 | ||
682 | if (redirection_undo_list) | |
683 | { | |
495aee44 | 684 | /* XXX - why copy here? */ |
726f6388 JA |
685 | my_undo_list = (REDIRECT *)copy_redirects (redirection_undo_list); |
686 | dispose_redirects (redirection_undo_list); | |
687 | redirection_undo_list = (REDIRECT *)NULL; | |
688 | } | |
689 | else | |
690 | my_undo_list = (REDIRECT *)NULL; | |
691 | ||
692 | if (exec_redirection_undo_list) | |
693 | { | |
495aee44 | 694 | /* XXX - why copy here? */ |
726f6388 JA |
695 | exec_undo_list = (REDIRECT *)copy_redirects (exec_redirection_undo_list); |
696 | dispose_redirects (exec_redirection_undo_list); | |
697 | exec_redirection_undo_list = (REDIRECT *)NULL; | |
698 | } | |
699 | else | |
700 | exec_undo_list = (REDIRECT *)NULL; | |
701 | ||
702 | if (my_undo_list || exec_undo_list) | |
703 | begin_unwind_frame ("loop_redirections"); | |
704 | ||
705 | if (my_undo_list) | |
706 | add_unwind_protect ((Function *)cleanup_redirects, my_undo_list); | |
707 | ||
708 | if (exec_undo_list) | |
709 | add_unwind_protect ((Function *)dispose_redirects, exec_undo_list); | |
710 | ||
711 | ignore_return = (command->flags & CMD_IGNORE_RETURN) != 0; | |
712 | ||
713 | QUIT; | |
714 | ||
715 | switch (command->type) | |
716 | { | |
ccc6cda3 JA |
717 | case cm_simple: |
718 | { | |
b80f6443 JA |
719 | save_line_number = line_number; |
720 | /* We can't rely on variables retaining their values across a | |
ccc6cda3 JA |
721 | call to execute_simple_command if a longjmp occurs as the |
722 | result of a `return' builtin. This is true for sure with gcc. */ | |
95732b49 JA |
723 | #if defined (RECYCLES_PIDS) |
724 | last_made_pid = NO_PID; | |
725 | #endif | |
ccc6cda3 | 726 | last_pid = last_made_pid; |
f73dda09 | 727 | was_error_trap = signal_is_trapped (ERROR_TRAP) && signal_is_ignored (ERROR_TRAP) == 0; |
ccc6cda3 JA |
728 | |
729 | if (ignore_return && command->value.Simple) | |
730 | command->value.Simple->flags |= CMD_IGNORE_RETURN; | |
d166f048 JA |
731 | if (command->flags & CMD_STDIN_REDIR) |
732 | command->value.Simple->flags |= CMD_STDIN_REDIR; | |
b80f6443 | 733 | |
0628567a | 734 | line_number_for_err_trap = line_number = command->value.Simple->line; |
ccc6cda3 JA |
735 | exec_result = |
736 | execute_simple_command (command->value.Simple, pipe_in, pipe_out, | |
737 | asynchronous, fds_to_close); | |
b80f6443 | 738 | line_number = save_line_number; |
ccc6cda3 JA |
739 | |
740 | /* The temporary environment should be used for only the simple | |
741 | command immediately following its definition. */ | |
742 | dispose_used_env_vars (); | |
743 | ||
744 | #if (defined (ultrix) && defined (mips)) || defined (C_ALLOCA) | |
745 | /* Reclaim memory allocated with alloca () on machines which | |
746 | may be using the alloca emulation code. */ | |
747 | (void) alloca (0); | |
748 | #endif /* (ultrix && mips) || C_ALLOCA */ | |
749 | ||
750 | /* If we forked to do the command, then we must wait_for () | |
751 | the child. */ | |
752 | ||
753 | /* XXX - this is something to watch out for if there are problems | |
754 | when the shell is compiled without job control. */ | |
755 | if (already_making_children && pipe_out == NO_PIPE && | |
95732b49 | 756 | last_made_pid != last_pid) |
ccc6cda3 JA |
757 | { |
758 | stop_pipeline (asynchronous, (COMMAND *)NULL); | |
759 | ||
760 | if (asynchronous) | |
761 | { | |
762 | DESCRIBE_PID (last_made_pid); | |
763 | } | |
764 | else | |
765 | #if !defined (JOB_CONTROL) | |
766 | /* Do not wait for asynchronous processes started from | |
767 | startup files. */ | |
768 | if (last_made_pid != last_asynchronous_pid) | |
769 | #endif | |
770 | /* When executing a shell function that executes other | |
771 | commands, this causes the last simple command in | |
b80f6443 JA |
772 | the function to be waited for twice. This also causes |
773 | subshells forked to execute builtin commands (e.g., in | |
774 | pipelines) to be waited for twice. */ | |
ccc6cda3 JA |
775 | exec_result = wait_for (last_made_pid); |
776 | } | |
777 | } | |
778 | ||
17345e5a JA |
779 | /* 2009/02/13 -- pipeline failure is processed elsewhere. This handles |
780 | only the failure of a simple command. */ | |
3185942a | 781 | if (was_error_trap && ignore_return == 0 && invert == 0 && pipe_in == NO_PIPE && pipe_out == NO_PIPE && exec_result != EXECUTION_SUCCESS) |
f73dda09 JA |
782 | { |
783 | last_command_exit_value = exec_result; | |
89a92869 | 784 | line_number = line_number_for_err_trap; |
f73dda09 | 785 | run_error_trap (); |
89a92869 | 786 | line_number = save_line_number; |
f73dda09 JA |
787 | } |
788 | ||
ccc6cda3 | 789 | if (ignore_return == 0 && invert == 0 && |
cce855bc | 790 | ((posixly_correct && interactive == 0 && special_builtin_failed) || |
3185942a | 791 | (exit_immediately_on_error && pipe_in == NO_PIPE && pipe_out == NO_PIPE && exec_result != EXECUTION_SUCCESS))) |
ccc6cda3 JA |
792 | { |
793 | last_command_exit_value = exec_result; | |
794 | run_pending_traps (); | |
b80f6443 | 795 | jump_to_top_level (ERREXIT); |
ccc6cda3 JA |
796 | } |
797 | ||
798 | break; | |
799 | ||
726f6388 JA |
800 | case cm_for: |
801 | if (ignore_return) | |
802 | command->value.For->flags |= CMD_IGNORE_RETURN; | |
803 | exec_result = execute_for_command (command->value.For); | |
804 | break; | |
805 | ||
bb70624e JA |
806 | #if defined (ARITH_FOR_COMMAND) |
807 | case cm_arith_for: | |
808 | if (ignore_return) | |
809 | command->value.ArithFor->flags |= CMD_IGNORE_RETURN; | |
810 | exec_result = execute_arith_for_command (command->value.ArithFor); | |
811 | break; | |
812 | #endif | |
813 | ||
726f6388 JA |
814 | #if defined (SELECT_COMMAND) |
815 | case cm_select: | |
816 | if (ignore_return) | |
817 | command->value.Select->flags |= CMD_IGNORE_RETURN; | |
818 | exec_result = execute_select_command (command->value.Select); | |
819 | break; | |
820 | #endif | |
821 | ||
822 | case cm_case: | |
823 | if (ignore_return) | |
824 | command->value.Case->flags |= CMD_IGNORE_RETURN; | |
825 | exec_result = execute_case_command (command->value.Case); | |
826 | break; | |
827 | ||
828 | case cm_while: | |
829 | if (ignore_return) | |
830 | command->value.While->flags |= CMD_IGNORE_RETURN; | |
831 | exec_result = execute_while_command (command->value.While); | |
832 | break; | |
833 | ||
834 | case cm_until: | |
835 | if (ignore_return) | |
836 | command->value.While->flags |= CMD_IGNORE_RETURN; | |
837 | exec_result = execute_until_command (command->value.While); | |
838 | break; | |
839 | ||
840 | case cm_if: | |
841 | if (ignore_return) | |
842 | command->value.If->flags |= CMD_IGNORE_RETURN; | |
843 | exec_result = execute_if_command (command->value.If); | |
844 | break; | |
845 | ||
846 | case cm_group: | |
847 | ||
848 | /* This code can be executed from either of two paths: an explicit | |
849 | '{}' command, or via a function call. If we are executed via a | |
850 | function call, we have already taken care of the function being | |
851 | executed in the background (down there in execute_simple_command ()), | |
852 | and this command should *not* be marked as asynchronous. If we | |
853 | are executing a regular '{}' group command, and asynchronous == 1, | |
854 | we must want to execute the whole command in the background, so we | |
855 | need a subshell, and we want the stuff executed in that subshell | |
856 | (this group command) to be executed in the foreground of that | |
857 | subshell (i.e. there will not be *another* subshell forked). | |
858 | ||
859 | What we do is to force a subshell if asynchronous, and then call | |
860 | execute_command_internal again with asynchronous still set to 1, | |
861 | but with the original group command, so the printed command will | |
862 | look right. | |
863 | ||
864 | The code above that handles forking off subshells will note that | |
865 | both subshell and async are on, and turn off async in the child | |
866 | after forking the subshell (but leave async set in the parent, so | |
867 | the normal call to describe_pid is made). This turning off | |
868 | async is *crucial*; if it is not done, this will fall into an | |
869 | infinite loop of executions through this spot in subshell after | |
870 | subshell until the process limit is exhausted. */ | |
871 | ||
872 | if (asynchronous) | |
873 | { | |
874 | command->flags |= CMD_FORCE_SUBSHELL; | |
875 | exec_result = | |
876 | execute_command_internal (command, 1, pipe_in, pipe_out, | |
877 | fds_to_close); | |
878 | } | |
879 | else | |
880 | { | |
881 | if (ignore_return && command->value.Group->command) | |
882 | command->value.Group->command->flags |= CMD_IGNORE_RETURN; | |
883 | exec_result = | |
884 | execute_command_internal (command->value.Group->command, | |
885 | asynchronous, pipe_in, pipe_out, | |
886 | fds_to_close); | |
887 | } | |
888 | break; | |
889 | ||
ccc6cda3 JA |
890 | case cm_connection: |
891 | exec_result = execute_connection (command, asynchronous, | |
892 | pipe_in, pipe_out, fds_to_close); | |
893 | break; | |
726f6388 | 894 | |
cce855bc JA |
895 | #if defined (DPAREN_ARITHMETIC) |
896 | case cm_arith: | |
0001803f | 897 | was_error_trap = signal_is_trapped (ERROR_TRAP) && signal_is_ignored (ERROR_TRAP) == 0; |
cce855bc JA |
898 | if (ignore_return) |
899 | command->value.Arith->flags |= CMD_IGNORE_RETURN; | |
0001803f | 900 | line_number_for_err_trap = save_line_number = line_number; |
cce855bc | 901 | exec_result = execute_arith_command (command->value.Arith); |
0001803f CR |
902 | line_number = save_line_number; |
903 | ||
904 | if (was_error_trap && ignore_return == 0 && invert == 0 && exec_result != EXECUTION_SUCCESS) | |
905 | { | |
906 | last_command_exit_value = exec_result; | |
907 | save_line_number = line_number; | |
908 | line_number = line_number_for_err_trap; | |
909 | run_error_trap (); | |
910 | line_number = save_line_number; | |
911 | } | |
912 | ||
913 | if (ignore_return == 0 && invert == 0 && exit_immediately_on_error && exec_result != EXECUTION_SUCCESS) | |
914 | { | |
915 | last_command_exit_value = exec_result; | |
916 | run_pending_traps (); | |
917 | jump_to_top_level (ERREXIT); | |
918 | } | |
919 | ||
cce855bc JA |
920 | break; |
921 | #endif | |
922 | ||
923 | #if defined (COND_COMMAND) | |
924 | case cm_cond: | |
0001803f | 925 | was_error_trap = signal_is_trapped (ERROR_TRAP) && signal_is_ignored (ERROR_TRAP) == 0; |
cce855bc JA |
926 | if (ignore_return) |
927 | command->value.Cond->flags |= CMD_IGNORE_RETURN; | |
0001803f CR |
928 | |
929 | line_number_for_err_trap = save_line_number = line_number; | |
cce855bc | 930 | exec_result = execute_cond_command (command->value.Cond); |
b80f6443 | 931 | line_number = save_line_number; |
0001803f CR |
932 | |
933 | if (was_error_trap && ignore_return == 0 && invert == 0 && exec_result != EXECUTION_SUCCESS) | |
934 | { | |
935 | last_command_exit_value = exec_result; | |
936 | save_line_number = line_number; | |
937 | line_number = line_number_for_err_trap; | |
938 | run_error_trap (); | |
939 | line_number = save_line_number; | |
940 | } | |
941 | ||
942 | if (ignore_return == 0 && invert == 0 && exit_immediately_on_error && exec_result != EXECUTION_SUCCESS) | |
943 | { | |
944 | last_command_exit_value = exec_result; | |
945 | run_pending_traps (); | |
946 | jump_to_top_level (ERREXIT); | |
947 | } | |
948 | ||
cce855bc JA |
949 | break; |
950 | #endif | |
951 | ||
ccc6cda3 JA |
952 | case cm_function_def: |
953 | exec_result = execute_intern_function (command->value.Function_def->name, | |
954 | command->value.Function_def->command); | |
955 | break; | |
726f6388 | 956 | |
ccc6cda3 | 957 | default: |
b72432fd | 958 | command_error ("execute_command", CMDERR_BADTYPE, command->type, 0); |
ccc6cda3 | 959 | } |
726f6388 | 960 | |
ccc6cda3 JA |
961 | if (my_undo_list) |
962 | { | |
b80f6443 | 963 | do_redirections (my_undo_list, RX_ACTIVE); |
ccc6cda3 JA |
964 | dispose_redirects (my_undo_list); |
965 | } | |
726f6388 | 966 | |
ccc6cda3 JA |
967 | if (exec_undo_list) |
968 | dispose_redirects (exec_undo_list); | |
726f6388 | 969 | |
ccc6cda3 JA |
970 | if (my_undo_list || exec_undo_list) |
971 | discard_unwind_frame ("loop_redirections"); | |
726f6388 | 972 | |
ccc6cda3 JA |
973 | /* Invert the return value if we have to */ |
974 | if (invert) | |
975 | exec_result = (exec_result == EXECUTION_SUCCESS) | |
976 | ? EXECUTION_FAILURE | |
977 | : EXECUTION_SUCCESS; | |
726f6388 | 978 | |
0628567a JA |
979 | #if defined (DPAREN_ARITHMETIC) || defined (COND_COMMAND) |
980 | /* This is where we set PIPESTATUS from the exit status of the appropriate | |
981 | compound commands (the ones that look enough like simple commands to | |
982 | cause confusion). We might be able to optimize by not doing this if | |
983 | subshell_environment != 0. */ | |
984 | switch (command->type) | |
985 | { | |
986 | # if defined (DPAREN_ARITHMETIC) | |
987 | case cm_arith: | |
988 | # endif | |
989 | # if defined (COND_COMMAND) | |
990 | case cm_cond: | |
991 | # endif | |
992 | set_pipestatus_from_exit (exec_result); | |
993 | break; | |
994 | } | |
995 | #endif | |
996 | ||
ccc6cda3 JA |
997 | last_command_exit_value = exec_result; |
998 | run_pending_traps (); | |
b80f6443 | 999 | #if 0 |
ccc6cda3 | 1000 | if (running_trap == 0) |
b80f6443 | 1001 | #endif |
ccc6cda3 JA |
1002 | currently_executing_command = (COMMAND *)NULL; |
1003 | return (last_command_exit_value); | |
1004 | } | |
726f6388 | 1005 | |
ccc6cda3 | 1006 | #if defined (COMMAND_TIMING) |
726f6388 | 1007 | |
bb70624e | 1008 | #if defined (HAVE_GETRUSAGE) && defined (HAVE_GETTIMEOFDAY) |
f73dda09 JA |
1009 | extern struct timeval *difftimeval __P((struct timeval *, struct timeval *, struct timeval *)); |
1010 | extern struct timeval *addtimeval __P((struct timeval *, struct timeval *, struct timeval *)); | |
1011 | extern int timeval_to_cpu __P((struct timeval *, struct timeval *, struct timeval *)); | |
bb70624e | 1012 | #endif |
726f6388 | 1013 | |
ccc6cda3 JA |
1014 | #define POSIX_TIMEFORMAT "real %2R\nuser %2U\nsys %2S" |
1015 | #define BASH_TIMEFORMAT "\nreal\t%3lR\nuser\t%3lU\nsys\t%3lS" | |
726f6388 | 1016 | |
3185942a | 1017 | static const int precs[] = { 0, 100, 10, 1 }; |
726f6388 | 1018 | |
ccc6cda3 JA |
1019 | /* Expand one `%'-prefixed escape sequence from a time format string. */ |
1020 | static int | |
1021 | mkfmt (buf, prec, lng, sec, sec_fraction) | |
1022 | char *buf; | |
1023 | int prec, lng; | |
f73dda09 | 1024 | time_t sec; |
ccc6cda3 JA |
1025 | int sec_fraction; |
1026 | { | |
f73dda09 JA |
1027 | time_t min; |
1028 | char abuf[INT_STRLEN_BOUND(time_t) + 1]; | |
ccc6cda3 | 1029 | int ind, aind; |
726f6388 | 1030 | |
ccc6cda3 | 1031 | ind = 0; |
f73dda09 | 1032 | abuf[sizeof(abuf) - 1] = '\0'; |
726f6388 | 1033 | |
ccc6cda3 JA |
1034 | /* If LNG is non-zero, we want to decompose SEC into minutes and seconds. */ |
1035 | if (lng) | |
1036 | { | |
1037 | min = sec / 60; | |
1038 | sec %= 60; | |
f73dda09 | 1039 | aind = sizeof(abuf) - 2; |
ccc6cda3 JA |
1040 | do |
1041 | abuf[aind--] = (min % 10) + '0'; | |
1042 | while (min /= 10); | |
1043 | aind++; | |
1044 | while (abuf[aind]) | |
cce855bc | 1045 | buf[ind++] = abuf[aind++]; |
ccc6cda3 JA |
1046 | buf[ind++] = 'm'; |
1047 | } | |
726f6388 | 1048 | |
ccc6cda3 | 1049 | /* Now add the seconds. */ |
f73dda09 | 1050 | aind = sizeof (abuf) - 2; |
ccc6cda3 JA |
1051 | do |
1052 | abuf[aind--] = (sec % 10) + '0'; | |
1053 | while (sec /= 10); | |
1054 | aind++; | |
1055 | while (abuf[aind]) | |
1056 | buf[ind++] = abuf[aind++]; | |
1057 | ||
1058 | /* We want to add a decimal point and PREC places after it if PREC is | |
1059 | nonzero. PREC is not greater than 3. SEC_FRACTION is between 0 | |
1060 | and 999. */ | |
1061 | if (prec != 0) | |
1062 | { | |
1063 | buf[ind++] = '.'; | |
1064 | for (aind = 1; aind <= prec; aind++) | |
1065 | { | |
1066 | buf[ind++] = (sec_fraction / precs[aind]) + '0'; | |
1067 | sec_fraction %= precs[aind]; | |
1068 | } | |
1069 | } | |
726f6388 | 1070 | |
ccc6cda3 JA |
1071 | if (lng) |
1072 | buf[ind++] = 's'; | |
1073 | buf[ind] = '\0'; | |
726f6388 | 1074 | |
ccc6cda3 JA |
1075 | return (ind); |
1076 | } | |
726f6388 | 1077 | |
ccc6cda3 JA |
1078 | /* Interpret the format string FORMAT, interpolating the following escape |
1079 | sequences: | |
7117c2d2 | 1080 | %[prec][l][RUS] |
ccc6cda3 JA |
1081 | |
1082 | where the optional `prec' is a precision, meaning the number of | |
1083 | characters after the decimal point, the optional `l' means to format | |
1084 | using minutes and seconds (MMmNN[.FF]s), like the `times' builtin', | |
1085 | and the last character is one of | |
1086 | ||
7117c2d2 JA |
1087 | R number of seconds of `real' time |
1088 | U number of seconds of `user' time | |
1089 | S number of seconds of `system' time | |
ccc6cda3 JA |
1090 | |
1091 | An occurrence of `%%' in the format string is translated to a `%'. The | |
1092 | result is printed to FP, a pointer to a FILE. The other variables are | |
1093 | the seconds and thousandths of a second of real, user, and system time, | |
1094 | resectively. */ | |
1095 | static void | |
1096 | print_formatted_time (fp, format, rs, rsf, us, usf, ss, ssf, cpu) | |
1097 | FILE *fp; | |
1098 | char *format; | |
f73dda09 JA |
1099 | time_t rs; |
1100 | int rsf; | |
1101 | time_t us; | |
1102 | int usf; | |
1103 | time_t ss; | |
1104 | int ssf, cpu; | |
ccc6cda3 JA |
1105 | { |
1106 | int prec, lng, len; | |
f73dda09 JA |
1107 | char *str, *s, ts[INT_STRLEN_BOUND (time_t) + sizeof ("mSS.FFFF")]; |
1108 | time_t sum; | |
e8ce775d | 1109 | int sum_frac; |
ccc6cda3 | 1110 | int sindex, ssize; |
726f6388 | 1111 | |
ccc6cda3 JA |
1112 | len = strlen (format); |
1113 | ssize = (len + 64) - (len % 64); | |
f73dda09 | 1114 | str = (char *)xmalloc (ssize); |
ccc6cda3 JA |
1115 | sindex = 0; |
1116 | ||
1117 | for (s = format; *s; s++) | |
1118 | { | |
1119 | if (*s != '%' || s[1] == '\0') | |
cce855bc JA |
1120 | { |
1121 | RESIZE_MALLOCED_BUFFER (str, sindex, 1, ssize, 64); | |
1122 | str[sindex++] = *s; | |
1123 | } | |
ccc6cda3 | 1124 | else if (s[1] == '%') |
cce855bc JA |
1125 | { |
1126 | s++; | |
1127 | RESIZE_MALLOCED_BUFFER (str, sindex, 1, ssize, 64); | |
1128 | str[sindex++] = *s; | |
1129 | } | |
ccc6cda3 JA |
1130 | else if (s[1] == 'P') |
1131 | { | |
1132 | s++; | |
17345e5a JA |
1133 | #if 0 |
1134 | /* clamp CPU usage at 100% */ | |
ccc6cda3 JA |
1135 | if (cpu > 10000) |
1136 | cpu = 10000; | |
17345e5a | 1137 | #endif |
ccc6cda3 JA |
1138 | sum = cpu / 100; |
1139 | sum_frac = (cpu % 100) * 10; | |
1140 | len = mkfmt (ts, 2, 0, sum, sum_frac); | |
1141 | RESIZE_MALLOCED_BUFFER (str, sindex, len, ssize, 64); | |
1142 | strcpy (str + sindex, ts); | |
1143 | sindex += len; | |
1144 | } | |
1145 | else | |
1146 | { | |
1147 | prec = 3; /* default is three places past the decimal point. */ | |
1148 | lng = 0; /* default is to not use minutes or append `s' */ | |
1149 | s++; | |
f73dda09 | 1150 | if (DIGIT (*s)) /* `precision' */ |
726f6388 | 1151 | { |
ccc6cda3 JA |
1152 | prec = *s++ - '0'; |
1153 | if (prec > 3) prec = 3; | |
726f6388 | 1154 | } |
ccc6cda3 JA |
1155 | if (*s == 'l') /* `length extender' */ |
1156 | { | |
1157 | lng = 1; | |
1158 | s++; | |
1159 | } | |
1160 | if (*s == 'R' || *s == 'E') | |
1161 | len = mkfmt (ts, prec, lng, rs, rsf); | |
1162 | else if (*s == 'U') | |
1163 | len = mkfmt (ts, prec, lng, us, usf); | |
1164 | else if (*s == 'S') | |
1165 | len = mkfmt (ts, prec, lng, ss, ssf); | |
1166 | else | |
1167 | { | |
b80f6443 | 1168 | internal_error (_("TIMEFORMAT: `%c': invalid format character"), *s); |
ccc6cda3 JA |
1169 | free (str); |
1170 | return; | |
1171 | } | |
1172 | RESIZE_MALLOCED_BUFFER (str, sindex, len, ssize, 64); | |
1173 | strcpy (str + sindex, ts); | |
1174 | sindex += len; | |
1175 | } | |
1176 | } | |
1177 | ||
1178 | str[sindex] = '\0'; | |
1179 | fprintf (fp, "%s\n", str); | |
1180 | fflush (fp); | |
1181 | ||
1182 | free (str); | |
1183 | } | |
1184 | ||
1185 | static int | |
1186 | time_command (command, asynchronous, pipe_in, pipe_out, fds_to_close) | |
1187 | COMMAND *command; | |
1188 | int asynchronous, pipe_in, pipe_out; | |
1189 | struct fd_bitmap *fds_to_close; | |
1190 | { | |
495aee44 | 1191 | int rv, posix_time, old_flags, nullcmd; |
f73dda09 | 1192 | time_t rs, us, ss; |
ccc6cda3 JA |
1193 | int rsf, usf, ssf; |
1194 | int cpu; | |
1195 | char *time_format; | |
1196 | ||
1197 | #if defined (HAVE_GETRUSAGE) && defined (HAVE_GETTIMEOFDAY) | |
1198 | struct timeval real, user, sys; | |
1199 | struct timeval before, after; | |
b80f6443 JA |
1200 | # if defined (HAVE_STRUCT_TIMEZONE) |
1201 | struct timezone dtz; /* posix doesn't define this */ | |
1202 | # endif | |
ccc6cda3 JA |
1203 | struct rusage selfb, selfa, kidsb, kidsa; /* a = after, b = before */ |
1204 | #else | |
1205 | # if defined (HAVE_TIMES) | |
1206 | clock_t tbefore, tafter, real, user, sys; | |
1207 | struct tms before, after; | |
1208 | # endif | |
1209 | #endif | |
1210 | ||
1211 | #if defined (HAVE_GETRUSAGE) && defined (HAVE_GETTIMEOFDAY) | |
b80f6443 | 1212 | # if defined (HAVE_STRUCT_TIMEZONE) |
ccc6cda3 | 1213 | gettimeofday (&before, &dtz); |
b80f6443 JA |
1214 | # else |
1215 | gettimeofday (&before, (void *)NULL); | |
1216 | # endif /* !HAVE_STRUCT_TIMEZONE */ | |
ccc6cda3 JA |
1217 | getrusage (RUSAGE_SELF, &selfb); |
1218 | getrusage (RUSAGE_CHILDREN, &kidsb); | |
1219 | #else | |
1220 | # if defined (HAVE_TIMES) | |
1221 | tbefore = times (&before); | |
1222 | # endif | |
1223 | #endif | |
1224 | ||
1225 | posix_time = (command->flags & CMD_TIME_POSIX); | |
1226 | ||
495aee44 CR |
1227 | nullcmd = (command == 0) || (command->type == cm_simple && command->value.Simple->words == 0 && command->value.Simple->redirects == 0); |
1228 | if (posixly_correct && nullcmd) | |
1229 | { | |
1230 | #if defined (HAVE_GETRUSAGE) | |
1231 | selfb.ru_utime.tv_sec = kidsb.ru_utime.tv_sec = selfb.ru_stime.tv_sec = kidsb.ru_stime.tv_sec = 0; | |
1232 | selfb.ru_utime.tv_usec = kidsb.ru_utime.tv_usec = selfb.ru_stime.tv_usec = kidsb.ru_stime.tv_usec = 0; | |
1233 | before.tv_sec = shell_start_time; | |
1234 | before.tv_usec = 0; | |
1235 | #else | |
1236 | before.tms_utime = before.tms_stime = before.tms_cutime = before.tms_cstime = 0; | |
1237 | tbefore = shell_start_time; | |
1238 | #endif | |
1239 | } | |
1240 | ||
d166f048 | 1241 | old_flags = command->flags; |
ccc6cda3 JA |
1242 | command->flags &= ~(CMD_TIME_PIPELINE|CMD_TIME_POSIX); |
1243 | rv = execute_command_internal (command, asynchronous, pipe_in, pipe_out, fds_to_close); | |
d166f048 | 1244 | command->flags = old_flags; |
ccc6cda3 | 1245 | |
f73dda09 | 1246 | rs = us = ss = 0; |
cce855bc JA |
1247 | rsf = usf = ssf = cpu = 0; |
1248 | ||
ccc6cda3 | 1249 | #if defined (HAVE_GETRUSAGE) && defined (HAVE_GETTIMEOFDAY) |
b80f6443 | 1250 | # if defined (HAVE_STRUCT_TIMEZONE) |
ccc6cda3 | 1251 | gettimeofday (&after, &dtz); |
b80f6443 JA |
1252 | # else |
1253 | gettimeofday (&after, (void *)NULL); | |
1254 | # endif /* !HAVE_STRUCT_TIMEZONE */ | |
ccc6cda3 JA |
1255 | getrusage (RUSAGE_SELF, &selfa); |
1256 | getrusage (RUSAGE_CHILDREN, &kidsa); | |
1257 | ||
1258 | difftimeval (&real, &before, &after); | |
1259 | timeval_to_secs (&real, &rs, &rsf); | |
1260 | ||
1261 | addtimeval (&user, difftimeval(&after, &selfb.ru_utime, &selfa.ru_utime), | |
1262 | difftimeval(&before, &kidsb.ru_utime, &kidsa.ru_utime)); | |
1263 | timeval_to_secs (&user, &us, &usf); | |
1264 | ||
1265 | addtimeval (&sys, difftimeval(&after, &selfb.ru_stime, &selfa.ru_stime), | |
1266 | difftimeval(&before, &kidsb.ru_stime, &kidsa.ru_stime)); | |
1267 | timeval_to_secs (&sys, &ss, &ssf); | |
1268 | ||
1269 | cpu = timeval_to_cpu (&real, &user, &sys); | |
1270 | #else | |
1271 | # if defined (HAVE_TIMES) | |
1272 | tafter = times (&after); | |
1273 | ||
1274 | real = tafter - tbefore; | |
1275 | clock_t_to_secs (real, &rs, &rsf); | |
1276 | ||
1277 | user = (after.tms_utime - before.tms_utime) + (after.tms_cutime - before.tms_cutime); | |
1278 | clock_t_to_secs (user, &us, &usf); | |
1279 | ||
1280 | sys = (after.tms_stime - before.tms_stime) + (after.tms_cstime - before.tms_cstime); | |
1281 | clock_t_to_secs (sys, &ss, &ssf); | |
1282 | ||
d166f048 | 1283 | cpu = (real == 0) ? 0 : ((user + sys) * 10000) / real; |
ccc6cda3 JA |
1284 | |
1285 | # else | |
f73dda09 | 1286 | rs = us = ss = 0; |
ccc6cda3 JA |
1287 | rsf = usf = ssf = cpu = 0; |
1288 | # endif | |
1289 | #endif | |
1290 | ||
1291 | if (posix_time) | |
1292 | time_format = POSIX_TIMEFORMAT; | |
1293 | else if ((time_format = get_string_value ("TIMEFORMAT")) == 0) | |
495aee44 CR |
1294 | { |
1295 | if (posixly_correct && nullcmd) | |
1296 | time_format = "user\t%2lU\nsys\t%2lS"; | |
1297 | else | |
1298 | time_format = BASH_TIMEFORMAT; | |
1299 | } | |
ccc6cda3 JA |
1300 | if (time_format && *time_format) |
1301 | print_formatted_time (stderr, time_format, rs, rsf, us, usf, ss, ssf, cpu); | |
1302 | ||
1303 | return rv; | |
1304 | } | |
1305 | #endif /* COMMAND_TIMING */ | |
1306 | ||
bb70624e | 1307 | /* Execute a command that's supposed to be in a subshell. This must be |
28ef6c31 JA |
1308 | called after make_child and we must be running in the child process. |
1309 | The caller will return or exit() immediately with the value this returns. */ | |
bb70624e JA |
1310 | static int |
1311 | execute_in_subshell (command, asynchronous, pipe_in, pipe_out, fds_to_close) | |
1312 | COMMAND *command; | |
1313 | int asynchronous; | |
1314 | int pipe_in, pipe_out; | |
1315 | struct fd_bitmap *fds_to_close; | |
1316 | { | |
28ef6c31 | 1317 | int user_subshell, return_code, function_value, should_redir_stdin, invert; |
3185942a | 1318 | int ois, user_coproc; |
0001803f | 1319 | int result; |
495aee44 | 1320 | volatile COMMAND *tcom; |
bb70624e | 1321 | |
f73dda09 | 1322 | USE_VAR(user_subshell); |
3185942a | 1323 | USE_VAR(user_coproc); |
f73dda09 JA |
1324 | USE_VAR(invert); |
1325 | USE_VAR(tcom); | |
1326 | USE_VAR(asynchronous); | |
1327 | ||
b80f6443 | 1328 | subshell_level++; |
bb70624e JA |
1329 | should_redir_stdin = (asynchronous && (command->flags & CMD_STDIN_REDIR) && |
1330 | pipe_in == NO_PIPE && | |
1331 | stdin_redirects (command->redirects) == 0); | |
1332 | ||
28ef6c31 | 1333 | invert = (command->flags & CMD_INVERT_RETURN) != 0; |
bb70624e | 1334 | user_subshell = command->type == cm_subshell || ((command->flags & CMD_WANT_SUBSHELL) != 0); |
3185942a | 1335 | user_coproc = command->type == cm_coproc; |
28ef6c31 | 1336 | |
bb70624e JA |
1337 | command->flags &= ~(CMD_FORCE_SUBSHELL | CMD_WANT_SUBSHELL | CMD_INVERT_RETURN); |
1338 | ||
1339 | /* If a command is asynchronous in a subshell (like ( foo ) & or | |
1340 | the special case of an asynchronous GROUP command where the | |
1341 | the subshell bit is turned on down in case cm_group: below), | |
1342 | turn off `asynchronous', so that two subshells aren't spawned. | |
0628567a JA |
1343 | XXX - asynchronous used to be set to 0 in this block, but that |
1344 | means that setup_async_signals was never run. Now it's set to | |
1345 | 0 after subshell_environment is set appropriately and setup_async_signals | |
1346 | is run. | |
bb70624e JA |
1347 | |
1348 | This seems semantically correct to me. For example, | |
1349 | ( foo ) & seems to say ``do the command `foo' in a subshell | |
1350 | environment, but don't wait for that subshell to finish'', | |
1351 | and "{ foo ; bar ; } &" seems to me to be like functions or | |
1352 | builtins in the background, which executed in a subshell | |
1353 | environment. I just don't see the need to fork two subshells. */ | |
1354 | ||
1355 | /* Don't fork again, we are already in a subshell. A `doubly | |
1356 | async' shell is not interactive, however. */ | |
1357 | if (asynchronous) | |
1358 | { | |
1359 | #if defined (JOB_CONTROL) | |
1360 | /* If a construct like ( exec xxx yyy ) & is given while job | |
1361 | control is active, we want to prevent exec from putting the | |
1362 | subshell back into the original process group, carefully | |
1363 | undoing all the work we just did in make_child. */ | |
1364 | original_pgrp = -1; | |
1365 | #endif /* JOB_CONTROL */ | |
28ef6c31 | 1366 | ois = interactive_shell; |
bb70624e | 1367 | interactive_shell = 0; |
28ef6c31 JA |
1368 | /* This test is to prevent alias expansion by interactive shells that |
1369 | run `(command) &' but to allow scripts that have enabled alias | |
1370 | expansion with `shopt -s expand_alias' to continue to expand | |
1371 | aliases. */ | |
1372 | if (ois != interactive_shell) | |
1373 | expand_aliases = 0; | |
bb70624e JA |
1374 | } |
1375 | ||
1376 | /* Subshells are neither login nor interactive. */ | |
1377 | login_shell = interactive = 0; | |
1378 | ||
0628567a JA |
1379 | if (user_subshell) |
1380 | subshell_environment = SUBSHELL_PAREN; | |
1381 | else | |
1382 | { | |
1383 | subshell_environment = 0; /* XXX */ | |
1384 | if (asynchronous) | |
1385 | subshell_environment |= SUBSHELL_ASYNC; | |
1386 | if (pipe_in != NO_PIPE || pipe_out != NO_PIPE) | |
1387 | subshell_environment |= SUBSHELL_PIPE; | |
3185942a JA |
1388 | if (user_coproc) |
1389 | subshell_environment |= SUBSHELL_COPROC; | |
0628567a | 1390 | } |
bb70624e JA |
1391 | |
1392 | reset_terminating_signals (); /* in sig.c */ | |
1393 | /* Cancel traps, in trap.c. */ | |
495aee44 CR |
1394 | /* Reset the signal handlers in the child, but don't free the |
1395 | trap strings. Set a flag noting that we have to free the | |
1396 | trap strings if we run trap to change a signal disposition. */ | |
1397 | reset_signal_handlers (); | |
1398 | subshell_environment |= SUBSHELL_RESETTRAP; | |
0628567a JA |
1399 | |
1400 | /* Make sure restore_original_signals doesn't undo the work done by | |
1401 | make_child to ensure that asynchronous children are immune to SIGINT | |
1402 | and SIGQUIT. Turn off asynchronous to make sure more subshells are | |
1403 | not spawned. */ | |
bb70624e | 1404 | if (asynchronous) |
0628567a JA |
1405 | { |
1406 | setup_async_signals (); | |
1407 | asynchronous = 0; | |
1408 | } | |
bb70624e JA |
1409 | |
1410 | #if defined (JOB_CONTROL) | |
1411 | set_sigchld_handler (); | |
1412 | #endif /* JOB_CONTROL */ | |
1413 | ||
1414 | set_sigint_handler (); | |
1415 | ||
1416 | #if defined (JOB_CONTROL) | |
1417 | /* Delete all traces that there were any jobs running. This is | |
1418 | only for subshells. */ | |
1419 | without_job_control (); | |
1420 | #endif /* JOB_CONTROL */ | |
1421 | ||
1422 | if (fds_to_close) | |
1423 | close_fd_bitmap (fds_to_close); | |
1424 | ||
1425 | do_piping (pipe_in, pipe_out); | |
1426 | ||
3185942a JA |
1427 | #if defined (COPROCESS_SUPPORT) |
1428 | coproc_closeall (); | |
1429 | #endif | |
1430 | ||
bb70624e JA |
1431 | /* If this is a user subshell, set a flag if stdin was redirected. |
1432 | This is used later to decide whether to redirect fd 0 to | |
1433 | /dev/null for async commands in the subshell. This adds more | |
1434 | sh compatibility, but I'm not sure it's the right thing to do. */ | |
1435 | if (user_subshell) | |
1436 | { | |
1437 | stdin_redir = stdin_redirects (command->redirects); | |
1438 | restore_default_signal (0); | |
1439 | } | |
1440 | ||
1441 | /* If this is an asynchronous command (command &), we want to | |
1442 | redirect the standard input from /dev/null in the absence of | |
1443 | any specific redirection involving stdin. */ | |
1444 | if (should_redir_stdin && stdin_redir == 0) | |
1445 | async_redirect_stdin (); | |
1446 | ||
1447 | /* Do redirections, then dispose of them before recursive call. */ | |
1448 | if (command->redirects) | |
1449 | { | |
b80f6443 | 1450 | if (do_redirections (command->redirects, RX_ACTIVE) != 0) |
28ef6c31 | 1451 | exit (invert ? EXECUTION_SUCCESS : EXECUTION_FAILURE); |
bb70624e JA |
1452 | |
1453 | dispose_redirects (command->redirects); | |
1454 | command->redirects = (REDIRECT *)NULL; | |
1455 | } | |
1456 | ||
3185942a JA |
1457 | if (command->type == cm_subshell) |
1458 | tcom = command->value.Subshell->command; | |
1459 | else if (user_coproc) | |
1460 | tcom = command->value.Coproc->command; | |
1461 | else | |
1462 | tcom = command; | |
bb70624e | 1463 | |
95732b49 JA |
1464 | if (command->flags & CMD_TIME_PIPELINE) |
1465 | tcom->flags |= CMD_TIME_PIPELINE; | |
1466 | if (command->flags & CMD_TIME_POSIX) | |
1467 | tcom->flags |= CMD_TIME_POSIX; | |
1468 | ||
f73dda09 JA |
1469 | /* Make sure the subshell inherits any CMD_IGNORE_RETURN flag. */ |
1470 | if ((command->flags & CMD_IGNORE_RETURN) && tcom != command) | |
1471 | tcom->flags |= CMD_IGNORE_RETURN; | |
1472 | ||
bb70624e JA |
1473 | /* If this is a simple command, tell execute_disk_command that it |
1474 | might be able to get away without forking and simply exec. | |
1475 | This means things like ( sleep 10 ) will only cause one fork. | |
28ef6c31 JA |
1476 | If we're timing the command or inverting its return value, however, |
1477 | we cannot do this optimization. */ | |
3185942a | 1478 | if ((user_subshell || user_coproc) && (tcom->type == cm_simple || tcom->type == cm_subshell) && |
28ef6c31 JA |
1479 | ((tcom->flags & CMD_TIME_PIPELINE) == 0) && |
1480 | ((tcom->flags & CMD_INVERT_RETURN) == 0)) | |
bb70624e JA |
1481 | { |
1482 | tcom->flags |= CMD_NO_FORK; | |
1483 | if (tcom->type == cm_simple) | |
1484 | tcom->value.Simple->flags |= CMD_NO_FORK; | |
1485 | } | |
1486 | ||
28ef6c31 JA |
1487 | invert = (tcom->flags & CMD_INVERT_RETURN) != 0; |
1488 | tcom->flags &= ~CMD_INVERT_RETURN; | |
1489 | ||
0001803f CR |
1490 | result = setjmp (top_level); |
1491 | ||
bb70624e JA |
1492 | /* If we're inside a function while executing this subshell, we |
1493 | need to handle a possible `return'. */ | |
1494 | function_value = 0; | |
1495 | if (return_catch_flag) | |
1496 | function_value = setjmp (return_catch); | |
1497 | ||
0001803f CR |
1498 | /* If we're going to exit the shell, we don't want to invert the return |
1499 | status. */ | |
1500 | if (result == EXITPROG) | |
1501 | invert = 0, return_code = last_command_exit_value; | |
1502 | else if (result) | |
1503 | return_code = EXECUTION_FAILURE; | |
1504 | else if (function_value) | |
bb70624e JA |
1505 | return_code = return_catch_value; |
1506 | else | |
0628567a | 1507 | return_code = execute_command_internal (tcom, asynchronous, NO_PIPE, NO_PIPE, fds_to_close); |
bb70624e | 1508 | |
28ef6c31 JA |
1509 | /* If we are asked to, invert the return value. */ |
1510 | if (invert) | |
1511 | return_code = (return_code == EXECUTION_SUCCESS) ? EXECUTION_FAILURE | |
1512 | : EXECUTION_SUCCESS; | |
1513 | ||
bb70624e JA |
1514 | /* If we were explicitly placed in a subshell with (), we need |
1515 | to do the `shell cleanup' things, such as running traps[0]. */ | |
1516 | if (user_subshell && signal_is_trapped (0)) | |
1517 | { | |
1518 | last_command_exit_value = return_code; | |
1519 | return_code = run_exit_trap (); | |
1520 | } | |
1521 | ||
b80f6443 | 1522 | subshell_level--; |
bb70624e JA |
1523 | return (return_code); |
1524 | /* NOTREACHED */ | |
1525 | } | |
1526 | ||
3185942a JA |
1527 | #if defined (COPROCESS_SUPPORT) |
1528 | #define COPROC_MAX 16 | |
1529 | ||
1530 | typedef struct cpelement | |
1531 | { | |
1532 | struct cpelement *next; | |
1533 | struct coproc *coproc; | |
1534 | } | |
1535 | cpelement_t; | |
1536 | ||
1537 | typedef struct cplist | |
1538 | { | |
1539 | struct cpelement *head; | |
1540 | struct cpelement *tail; | |
1541 | int ncoproc; | |
1542 | } | |
1543 | cplist_t; | |
1544 | ||
1545 | static struct cpelement *cpe_alloc __P((struct coproc *)); | |
1546 | static void cpe_dispose __P((struct cpelement *)); | |
1547 | static struct cpelement *cpl_add __P((struct coproc *)); | |
1548 | static struct cpelement *cpl_delete __P((pid_t)); | |
17345e5a | 1549 | static void cpl_reap __P((void)); |
3185942a JA |
1550 | static void cpl_flush __P((void)); |
1551 | static struct cpelement *cpl_search __P((pid_t)); | |
1552 | static struct cpelement *cpl_searchbyname __P((char *)); | |
1553 | static void cpl_prune __P((void)); | |
1554 | ||
495aee44 | 1555 | Coproc sh_coproc = { 0, NO_PID, -1, -1, 0, 0, 0, 0 }; |
3185942a JA |
1556 | |
1557 | cplist_t coproc_list = {0, 0, 0}; | |
1558 | ||
17345e5a | 1559 | /* Functions to manage the list of coprocs */ |
3185942a JA |
1560 | |
1561 | static struct cpelement * | |
1562 | cpe_alloc (cp) | |
1563 | Coproc *cp; | |
1564 | { | |
1565 | struct cpelement *cpe; | |
1566 | ||
1567 | cpe = (struct cpelement *)xmalloc (sizeof (struct cpelement)); | |
1568 | cpe->coproc = cp; | |
1569 | cpe->next = (struct cpelement *)0; | |
1570 | return cpe; | |
1571 | } | |
1572 | ||
1573 | static void | |
1574 | cpe_dispose (cpe) | |
1575 | struct cpelement *cpe; | |
1576 | { | |
1577 | free (cpe); | |
1578 | } | |
1579 | ||
1580 | static struct cpelement * | |
1581 | cpl_add (cp) | |
1582 | Coproc *cp; | |
1583 | { | |
1584 | struct cpelement *cpe; | |
1585 | ||
1586 | cpe = cpe_alloc (cp); | |
1587 | ||
1588 | if (coproc_list.head == 0) | |
1589 | { | |
1590 | coproc_list.head = coproc_list.tail = cpe; | |
1591 | coproc_list.ncoproc = 0; /* just to make sure */ | |
1592 | } | |
1593 | else | |
1594 | { | |
1595 | coproc_list.tail->next = cpe; | |
1596 | coproc_list.tail = cpe; | |
1597 | } | |
1598 | coproc_list.ncoproc++; | |
1599 | ||
1600 | return cpe; | |
1601 | } | |
1602 | ||
1603 | static struct cpelement * | |
1604 | cpl_delete (pid) | |
1605 | pid_t pid; | |
1606 | { | |
1607 | struct cpelement *prev, *p; | |
1608 | ||
1609 | for (prev = p = coproc_list.head; p; prev = p, p = p->next) | |
1610 | if (p->coproc->c_pid == pid) | |
1611 | { | |
1612 | prev->next = p->next; /* remove from list */ | |
1613 | break; | |
1614 | } | |
1615 | ||
1616 | if (p == 0) | |
1617 | return 0; /* not found */ | |
1618 | ||
1619 | #if defined (DEBUG) | |
1620 | itrace("cpl_delete: deleting %d", pid); | |
1621 | #endif | |
1622 | ||
1623 | /* Housekeeping in the border cases. */ | |
1624 | if (p == coproc_list.head) | |
1625 | coproc_list.head = coproc_list.head->next; | |
1626 | else if (p == coproc_list.tail) | |
1627 | coproc_list.tail = prev; | |
1628 | ||
1629 | coproc_list.ncoproc--; | |
1630 | if (coproc_list.ncoproc == 0) | |
1631 | coproc_list.head = coproc_list.tail = 0; | |
1632 | else if (coproc_list.ncoproc == 1) | |
1633 | coproc_list.tail = coproc_list.head; /* just to make sure */ | |
1634 | ||
1635 | return (p); | |
1636 | } | |
1637 | ||
17345e5a JA |
1638 | static void |
1639 | cpl_reap () | |
1640 | { | |
1641 | struct cpelement *prev, *p; | |
1642 | ||
1643 | for (prev = p = coproc_list.head; p; prev = p, p = p->next) | |
1644 | if (p->coproc->c_flags & COPROC_DEAD) | |
1645 | { | |
1646 | prev->next = p->next; /* remove from list */ | |
1647 | ||
1648 | /* Housekeeping in the border cases. */ | |
1649 | if (p == coproc_list.head) | |
1650 | coproc_list.head = coproc_list.head->next; | |
1651 | else if (p == coproc_list.tail) | |
1652 | coproc_list.tail = prev; | |
1653 | ||
1654 | coproc_list.ncoproc--; | |
1655 | if (coproc_list.ncoproc == 0) | |
1656 | coproc_list.head = coproc_list.tail = 0; | |
1657 | else if (coproc_list.ncoproc == 1) | |
1658 | coproc_list.tail = coproc_list.head; /* just to make sure */ | |
1659 | ||
1660 | #if defined (DEBUG) | |
1661 | itrace("cpl_reap: deleting %d", p->coproc->c_pid); | |
1662 | #endif | |
1663 | ||
1664 | coproc_dispose (p->coproc); | |
1665 | cpe_dispose (p); | |
1666 | } | |
1667 | } | |
1668 | ||
3185942a JA |
1669 | /* Clear out the list of saved statuses */ |
1670 | static void | |
1671 | cpl_flush () | |
1672 | { | |
1673 | struct cpelement *cpe, *p; | |
1674 | ||
1675 | for (cpe = coproc_list.head; cpe; ) | |
1676 | { | |
1677 | p = cpe; | |
1678 | cpe = cpe->next; | |
1679 | ||
1680 | coproc_dispose (p->coproc); | |
1681 | cpe_dispose (p); | |
1682 | } | |
1683 | ||
1684 | coproc_list.head = coproc_list.tail = 0; | |
1685 | coproc_list.ncoproc = 0; | |
1686 | } | |
1687 | ||
1688 | /* Search for PID in the list of coprocs; return the cpelement struct if | |
1689 | found. If not found, return NULL. */ | |
1690 | static struct cpelement * | |
1691 | cpl_search (pid) | |
1692 | pid_t pid; | |
1693 | { | |
1694 | struct cpelement *cp; | |
1695 | ||
1696 | for (cp = coproc_list.head ; cp; cp = cp->next) | |
1697 | if (cp->coproc->c_pid == pid) | |
1698 | return cp; | |
1699 | return (struct cpelement *)NULL; | |
1700 | } | |
1701 | ||
1702 | /* Search for the coproc named NAME in the list of coprocs; return the | |
1703 | cpelement struct if found. If not found, return NULL. */ | |
1704 | static struct cpelement * | |
1705 | cpl_searchbyname (name) | |
1706 | char *name; | |
1707 | { | |
1708 | struct cpelement *cp; | |
1709 | ||
1710 | for (cp = coproc_list.head ; cp; cp = cp->next) | |
1711 | if (STREQ (cp->coproc->c_name, name)) | |
1712 | return cp; | |
1713 | return (struct cpelement *)NULL; | |
1714 | } | |
1715 | ||
1716 | #if 0 | |
1717 | static void | |
1718 | cpl_prune () | |
1719 | { | |
1720 | struct cpelement *cp; | |
1721 | ||
1722 | while (coproc_list.head && coproc_list.ncoproc > COPROC_MAX) | |
1723 | { | |
1724 | cp = coproc_list.head; | |
1725 | coproc_list.head = coproc_list.head->next; | |
1726 | coproc_dispose (cp->coproc); | |
1727 | cpe_dispose (cp); | |
1728 | coproc_list.ncoproc--; | |
1729 | } | |
1730 | } | |
1731 | #endif | |
1732 | ||
1733 | /* These currently use a single global "shell coproc" but are written in a | |
1734 | way to not preclude additional coprocs later (using the list management | |
1735 | package above). */ | |
1736 | ||
1737 | struct coproc * | |
1738 | getcoprocbypid (pid) | |
1739 | pid_t pid; | |
1740 | { | |
1741 | return (pid == sh_coproc.c_pid ? &sh_coproc : 0); | |
1742 | } | |
1743 | ||
1744 | struct coproc * | |
1745 | getcoprocbyname (name) | |
1746 | const char *name; | |
1747 | { | |
1748 | return ((sh_coproc.c_name && STREQ (sh_coproc.c_name, name)) ? &sh_coproc : 0); | |
1749 | } | |
1750 | ||
1751 | void | |
1752 | coproc_init (cp) | |
1753 | struct coproc *cp; | |
1754 | { | |
1755 | cp->c_name = 0; | |
1756 | cp->c_pid = NO_PID; | |
1757 | cp->c_rfd = cp->c_wfd = -1; | |
1758 | cp->c_rsave = cp->c_wsave = -1; | |
1759 | cp->c_flags = cp->c_status = 0; | |
1760 | } | |
1761 | ||
1762 | struct coproc * | |
1763 | coproc_alloc (name, pid) | |
1764 | char *name; | |
1765 | pid_t pid; | |
1766 | { | |
1767 | struct coproc *cp; | |
1768 | ||
1769 | cp = &sh_coproc; /* XXX */ | |
1770 | coproc_init (cp); | |
1771 | ||
1772 | cp->c_name = savestring (name); | |
1773 | cp->c_pid = pid; | |
1774 | ||
1775 | return (cp); | |
1776 | } | |
1777 | ||
1778 | void | |
1779 | coproc_dispose (cp) | |
1780 | struct coproc *cp; | |
1781 | { | |
1782 | if (cp == 0) | |
1783 | return; | |
1784 | ||
1785 | coproc_unsetvars (cp); | |
1786 | FREE (cp->c_name); | |
1787 | coproc_close (cp); | |
1788 | coproc_init (cp); | |
1789 | } | |
1790 | ||
1791 | /* Placeholder for now. */ | |
1792 | void | |
1793 | coproc_flush () | |
1794 | { | |
1795 | coproc_dispose (&sh_coproc); | |
1796 | } | |
1797 | ||
1798 | void | |
1799 | coproc_close (cp) | |
1800 | struct coproc *cp; | |
1801 | { | |
1802 | if (cp->c_rfd >= 0) | |
1803 | { | |
1804 | close (cp->c_rfd); | |
1805 | cp->c_rfd = -1; | |
1806 | } | |
1807 | if (cp->c_wfd >= 0) | |
1808 | { | |
1809 | close (cp->c_wfd); | |
1810 | cp->c_wfd = -1; | |
1811 | } | |
1812 | cp->c_rsave = cp->c_wsave = -1; | |
1813 | } | |
1814 | ||
1815 | void | |
1816 | coproc_closeall () | |
1817 | { | |
1818 | coproc_close (&sh_coproc); | |
1819 | } | |
1820 | ||
17345e5a JA |
1821 | void |
1822 | coproc_reap () | |
1823 | { | |
1824 | struct coproc *cp; | |
1825 | ||
1826 | cp = &sh_coproc; | |
1827 | if (cp && (cp->c_flags & COPROC_DEAD)) | |
1828 | coproc_dispose (cp); | |
1829 | } | |
1830 | ||
3185942a JA |
1831 | void |
1832 | coproc_rclose (cp, fd) | |
1833 | struct coproc *cp; | |
1834 | int fd; | |
1835 | { | |
1836 | if (cp->c_rfd >= 0 && cp->c_rfd == fd) | |
1837 | { | |
1838 | close (cp->c_rfd); | |
1839 | cp->c_rfd = -1; | |
1840 | } | |
1841 | } | |
1842 | ||
1843 | void | |
1844 | coproc_wclose (cp, fd) | |
1845 | struct coproc *cp; | |
1846 | int fd; | |
1847 | { | |
1848 | if (cp->c_wfd >= 0 && cp->c_wfd == fd) | |
1849 | { | |
1850 | close (cp->c_wfd); | |
1851 | cp->c_wfd = -1; | |
1852 | } | |
1853 | } | |
1854 | ||
1855 | void | |
1856 | coproc_checkfd (cp, fd) | |
1857 | struct coproc *cp; | |
1858 | int fd; | |
1859 | { | |
1860 | int update; | |
1861 | ||
1862 | update = 0; | |
1863 | if (cp->c_rfd >= 0 && cp->c_rfd == fd) | |
1864 | update = cp->c_rfd = -1; | |
1865 | if (cp->c_wfd >= 0 && cp->c_wfd == fd) | |
1866 | update = cp->c_wfd = -1; | |
1867 | if (update) | |
1868 | coproc_setvars (cp); | |
1869 | } | |
1870 | ||
1871 | void | |
1872 | coproc_fdchk (fd) | |
1873 | int fd; | |
1874 | { | |
1875 | coproc_checkfd (&sh_coproc, fd); | |
1876 | } | |
1877 | ||
1878 | void | |
1879 | coproc_fdclose (cp, fd) | |
1880 | struct coproc *cp; | |
1881 | int fd; | |
1882 | { | |
1883 | coproc_rclose (cp, fd); | |
1884 | coproc_wclose (cp, fd); | |
1885 | coproc_setvars (cp); | |
1886 | } | |
1887 | ||
1888 | void | |
1889 | coproc_fdsave (cp) | |
1890 | struct coproc *cp; | |
1891 | { | |
1892 | cp->c_rsave = cp->c_rfd; | |
1893 | cp->c_wsave = cp->c_wfd; | |
1894 | } | |
1895 | ||
1896 | void | |
1897 | coproc_fdrestore (cp) | |
1898 | struct coproc *cp; | |
1899 | { | |
1900 | cp->c_rfd = cp->c_rsave; | |
1901 | cp->c_wfd = cp->c_wsave; | |
1902 | } | |
17345e5a | 1903 | |
3185942a | 1904 | void |
17345e5a | 1905 | coproc_pidchk (pid, status) |
3185942a JA |
1906 | pid_t pid; |
1907 | { | |
1908 | struct coproc *cp; | |
1909 | ||
1910 | cp = getcoprocbypid (pid); | |
1911 | #if 0 | |
1912 | if (cp) | |
1913 | itrace("coproc_pidchk: pid %d has died", pid); | |
1914 | #endif | |
1915 | if (cp) | |
17345e5a JA |
1916 | { |
1917 | cp->c_status = status; | |
1918 | cp->c_flags |= COPROC_DEAD; | |
1919 | cp->c_flags &= ~COPROC_RUNNING; | |
1920 | #if 0 | |
1921 | coproc_dispose (cp); | |
1922 | #endif | |
1923 | } | |
3185942a JA |
1924 | } |
1925 | ||
1926 | void | |
1927 | coproc_setvars (cp) | |
1928 | struct coproc *cp; | |
1929 | { | |
1930 | SHELL_VAR *v; | |
1931 | char *namevar, *t; | |
1932 | int l; | |
1933 | #if defined (ARRAY_VARS) | |
1934 | arrayind_t ind; | |
1935 | #endif | |
1936 | ||
1937 | if (cp->c_name == 0) | |
1938 | return; | |
1939 | ||
1940 | l = strlen (cp->c_name); | |
1941 | namevar = xmalloc (l + 16); | |
1942 | ||
1943 | #if defined (ARRAY_VARS) | |
1944 | v = find_variable (cp->c_name); | |
1945 | if (v == 0) | |
1946 | v = make_new_array_variable (cp->c_name); | |
1947 | if (array_p (v) == 0) | |
1948 | v = convert_var_to_array (v); | |
1949 | ||
1950 | t = itos (cp->c_rfd); | |
1951 | ind = 0; | |
1952 | v = bind_array_variable (cp->c_name, ind, t, 0); | |
1953 | free (t); | |
1954 | ||
1955 | t = itos (cp->c_wfd); | |
1956 | ind = 1; | |
1957 | bind_array_variable (cp->c_name, ind, t, 0); | |
1958 | free (t); | |
1959 | #else | |
1960 | sprintf (namevar, "%s_READ", cp->c_name); | |
1961 | t = itos (cp->c_rfd); | |
1962 | bind_variable (namevar, t, 0); | |
1963 | free (t); | |
1964 | sprintf (namevar, "%s_WRITE", cp->c_name); | |
1965 | t = itos (cp->c_wfd); | |
1966 | bind_variable (namevar, t, 0); | |
1967 | free (t); | |
1968 | #endif | |
1969 | ||
1970 | sprintf (namevar, "%s_PID", cp->c_name); | |
1971 | t = itos (cp->c_pid); | |
1972 | bind_variable (namevar, t, 0); | |
1973 | free (t); | |
1974 | ||
1975 | free (namevar); | |
1976 | } | |
1977 | ||
1978 | void | |
1979 | coproc_unsetvars (cp) | |
1980 | struct coproc *cp; | |
1981 | { | |
1982 | int l; | |
1983 | char *namevar; | |
1984 | ||
1985 | if (cp->c_name == 0) | |
1986 | return; | |
1987 | ||
1988 | l = strlen (cp->c_name); | |
1989 | namevar = xmalloc (l + 16); | |
1990 | ||
1991 | sprintf (namevar, "%s_PID", cp->c_name); | |
1992 | unbind_variable (namevar); | |
1993 | ||
1994 | #if defined (ARRAY_VARS) | |
1995 | unbind_variable (cp->c_name); | |
1996 | #else | |
1997 | sprintf (namevar, "%s_READ", cp->c_name); | |
1998 | unbind_variable (namevar); | |
1999 | sprintf (namevar, "%s_WRITE", cp->c_name); | |
2000 | unbind_variable (namevar); | |
2001 | #endif | |
2002 | ||
2003 | free (namevar); | |
2004 | } | |
2005 | ||
2006 | static int | |
2007 | execute_coproc (command, pipe_in, pipe_out, fds_to_close) | |
2008 | COMMAND *command; | |
2009 | int pipe_in, pipe_out; | |
2010 | struct fd_bitmap *fds_to_close; | |
2011 | { | |
0001803f | 2012 | int rpipe[2], wpipe[2], estat; |
3185942a JA |
2013 | pid_t coproc_pid; |
2014 | Coproc *cp; | |
2015 | char *tcmd; | |
2016 | ||
2017 | /* XXX -- will require changes to handle multiple coprocs */ | |
2018 | if (sh_coproc.c_pid != NO_PID) | |
2019 | { | |
2020 | #if 0 | |
2021 | internal_error ("execute_coproc: coproc [%d:%s] already exists", sh_coproc.c_pid, sh_coproc.c_name); | |
2022 | return (last_command_exit_value = EXECUTION_FAILURE); | |
2023 | #else | |
2024 | internal_warning ("execute_coproc: coproc [%d:%s] still exists", sh_coproc.c_pid, sh_coproc.c_name); | |
2025 | #endif | |
2026 | } | |
2027 | coproc_init (&sh_coproc); | |
2028 | ||
2029 | command_string_index = 0; | |
2030 | tcmd = make_command_string (command); | |
2031 | ||
2032 | sh_openpipe ((int *)&rpipe); /* 0 = parent read, 1 = child write */ | |
2033 | sh_openpipe ((int *)&wpipe); /* 0 = child read, 1 = parent write */ | |
2034 | ||
2035 | coproc_pid = make_child (savestring (tcmd), 1); | |
2036 | if (coproc_pid == 0) | |
2037 | { | |
2038 | close (rpipe[0]); | |
2039 | close (wpipe[1]); | |
2040 | ||
0001803f CR |
2041 | estat = execute_in_subshell (command, 1, wpipe[0], rpipe[1], fds_to_close); |
2042 | ||
2043 | fflush (stdout); | |
2044 | fflush (stderr); | |
2045 | ||
2046 | exit (estat); | |
3185942a JA |
2047 | } |
2048 | ||
2049 | close (rpipe[1]); | |
2050 | close (wpipe[0]); | |
2051 | ||
2052 | cp = coproc_alloc (command->value.Coproc->name, coproc_pid); | |
2053 | cp->c_rfd = rpipe[0]; | |
2054 | cp->c_wfd = wpipe[1]; | |
2055 | ||
2056 | SET_CLOSE_ON_EXEC (cp->c_rfd); | |
2057 | SET_CLOSE_ON_EXEC (cp->c_wfd); | |
2058 | ||
2059 | coproc_setvars (cp); | |
2060 | ||
2061 | #if 0 | |
2062 | itrace ("execute_coproc: [%d] %s", coproc_pid, the_printed_command); | |
2063 | #endif | |
2064 | ||
2065 | close_pipes (pipe_in, pipe_out); | |
2066 | #if defined (PROCESS_SUBSTITUTION) && defined (HAVE_DEV_FD) | |
2067 | unlink_fifo_list (); | |
2068 | #endif | |
2069 | stop_pipeline (1, (COMMAND *)NULL); | |
2070 | DESCRIBE_PID (coproc_pid); | |
2071 | run_pending_traps (); | |
2072 | ||
2073 | return (EXECUTION_SUCCESS); | |
2074 | } | |
2075 | #endif | |
2076 | ||
495aee44 CR |
2077 | static void |
2078 | restore_stdin (s) | |
2079 | int s; | |
2080 | { | |
2081 | dup2 (s, 0); | |
2082 | close (s); | |
2083 | } | |
2084 | ||
2085 | /* Catch-all cleanup function for lastpipe code for unwind-protects */ | |
2086 | static void | |
2087 | lastpipe_cleanup (s) | |
2088 | int s; | |
2089 | { | |
2090 | unfreeze_jobs_list (); | |
2091 | } | |
2092 | ||
ccc6cda3 JA |
2093 | static int |
2094 | execute_pipeline (command, asynchronous, pipe_in, pipe_out, fds_to_close) | |
2095 | COMMAND *command; | |
2096 | int asynchronous, pipe_in, pipe_out; | |
2097 | struct fd_bitmap *fds_to_close; | |
2098 | { | |
2099 | int prev, fildes[2], new_bitmap_size, dummyfd, ignore_return, exec_result; | |
495aee44 | 2100 | int lstdin, lastpipe_flag, lastpipe_jid; |
ccc6cda3 JA |
2101 | COMMAND *cmd; |
2102 | struct fd_bitmap *fd_bitmap; | |
495aee44 | 2103 | pid_t lastpid; |
726f6388 JA |
2104 | |
2105 | #if defined (JOB_CONTROL) | |
ccc6cda3 JA |
2106 | sigset_t set, oset; |
2107 | BLOCK_CHILD (set, oset); | |
726f6388 JA |
2108 | #endif /* JOB_CONTROL */ |
2109 | ||
ccc6cda3 | 2110 | ignore_return = (command->flags & CMD_IGNORE_RETURN) != 0; |
726f6388 | 2111 | |
ccc6cda3 JA |
2112 | prev = pipe_in; |
2113 | cmd = command; | |
2114 | ||
2115 | while (cmd && cmd->type == cm_connection && | |
2116 | cmd->value.Connection && cmd->value.Connection->connector == '|') | |
2117 | { | |
2118 | /* Make a pipeline between the two commands. */ | |
2119 | if (pipe (fildes) < 0) | |
2120 | { | |
3185942a | 2121 | sys_error (_("pipe error")); |
726f6388 | 2122 | #if defined (JOB_CONTROL) |
ccc6cda3 JA |
2123 | terminate_current_pipeline (); |
2124 | kill_current_pipeline (); | |
95732b49 | 2125 | UNBLOCK_CHILD (oset); |
726f6388 | 2126 | #endif /* JOB_CONTROL */ |
ccc6cda3 JA |
2127 | last_command_exit_value = EXECUTION_FAILURE; |
2128 | /* The unwind-protects installed below will take care | |
2129 | of closing all of the open file descriptors. */ | |
2130 | throw_to_top_level (); | |
2131 | return (EXECUTION_FAILURE); /* XXX */ | |
2132 | } | |
2133 | ||
2134 | /* Here is a problem: with the new file close-on-exec | |
2135 | code, the read end of the pipe (fildes[0]) stays open | |
2136 | in the first process, so that process will never get a | |
2137 | SIGPIPE. There is no way to signal the first process | |
2138 | that it should close fildes[0] after forking, so it | |
2139 | remains open. No SIGPIPE is ever sent because there | |
2140 | is still a file descriptor open for reading connected | |
2141 | to the pipe. We take care of that here. This passes | |
2142 | around a bitmap of file descriptors that must be | |
2143 | closed after making a child process in execute_simple_command. */ | |
2144 | ||
2145 | /* We need fd_bitmap to be at least as big as fildes[0]. | |
2146 | If fildes[0] is less than fds_to_close->size, then | |
2147 | use fds_to_close->size. */ | |
2148 | new_bitmap_size = (fildes[0] < fds_to_close->size) | |
2149 | ? fds_to_close->size | |
2150 | : fildes[0] + 8; | |
2151 | ||
2152 | fd_bitmap = new_fd_bitmap (new_bitmap_size); | |
2153 | ||
2154 | /* Now copy the old information into the new bitmap. */ | |
2155 | xbcopy ((char *)fds_to_close->bitmap, (char *)fd_bitmap->bitmap, fds_to_close->size); | |
2156 | ||
2157 | /* And mark the pipe file descriptors to be closed. */ | |
2158 | fd_bitmap->bitmap[fildes[0]] = 1; | |
2159 | ||
2160 | /* In case there are pipe or out-of-processes errors, we | |
cce855bc | 2161 | want all these file descriptors to be closed when |
ccc6cda3 JA |
2162 | unwind-protects are run, and the storage used for the |
2163 | bitmaps freed up. */ | |
2164 | begin_unwind_frame ("pipe-file-descriptors"); | |
2165 | add_unwind_protect (dispose_fd_bitmap, fd_bitmap); | |
2166 | add_unwind_protect (close_fd_bitmap, fd_bitmap); | |
2167 | if (prev >= 0) | |
2168 | add_unwind_protect (close, prev); | |
2169 | dummyfd = fildes[1]; | |
2170 | add_unwind_protect (close, dummyfd); | |
726f6388 JA |
2171 | |
2172 | #if defined (JOB_CONTROL) | |
f73dda09 | 2173 | add_unwind_protect (restore_signal_mask, &oset); |
726f6388 JA |
2174 | #endif /* JOB_CONTROL */ |
2175 | ||
ccc6cda3 JA |
2176 | if (ignore_return && cmd->value.Connection->first) |
2177 | cmd->value.Connection->first->flags |= CMD_IGNORE_RETURN; | |
2178 | execute_command_internal (cmd->value.Connection->first, asynchronous, | |
2179 | prev, fildes[1], fd_bitmap); | |
2180 | ||
2181 | if (prev >= 0) | |
2182 | close (prev); | |
2183 | ||
2184 | prev = fildes[0]; | |
2185 | close (fildes[1]); | |
2186 | ||
2187 | dispose_fd_bitmap (fd_bitmap); | |
2188 | discard_unwind_frame ("pipe-file-descriptors"); | |
726f6388 | 2189 | |
ccc6cda3 JA |
2190 | cmd = cmd->value.Connection->second; |
2191 | } | |
2192 | ||
495aee44 CR |
2193 | lastpid = last_made_pid; |
2194 | ||
ccc6cda3 JA |
2195 | /* Now execute the rightmost command in the pipeline. */ |
2196 | if (ignore_return && cmd) | |
2197 | cmd->flags |= CMD_IGNORE_RETURN; | |
495aee44 | 2198 | |
335de49a | 2199 | #if defined (JOB_CONTROL) |
495aee44 CR |
2200 | lastpipe_flag = 0; |
2201 | begin_unwind_frame ("lastpipe-exec"); | |
2202 | lstdin = -1; | |
2203 | /* If the `lastpipe' option is set with shopt, and job control is not | |
2204 | enabled, execute the last element of non-async pipelines in the | |
2205 | current shell environment. */ | |
2206 | if (lastpipe_opt && job_control == 0 && asynchronous == 0 && pipe_out == NO_PIPE && prev > 0) | |
2207 | { | |
72347977 | 2208 | lstdin = move_to_high_fd (0, 1, -1); |
495aee44 CR |
2209 | if (lstdin > 0) |
2210 | { | |
2211 | do_piping (prev, pipe_out); | |
2212 | prev = NO_PIPE; | |
2213 | add_unwind_protect (restore_stdin, lstdin); | |
2214 | lastpipe_flag = 1; | |
2215 | freeze_jobs_list (); | |
2216 | lastpipe_jid = stop_pipeline (0, (COMMAND *)NULL); /* XXX */ | |
2217 | add_unwind_protect (lastpipe_cleanup, lastpipe_jid); | |
2218 | } | |
335de49a CR |
2219 | if (cmd) |
2220 | cmd->flags |= CMD_LASTPIPE; | |
495aee44 CR |
2221 | } |
2222 | if (prev >= 0) | |
2223 | add_unwind_protect (close, prev); | |
335de49a | 2224 | #endif |
495aee44 | 2225 | |
ccc6cda3 | 2226 | exec_result = execute_command_internal (cmd, asynchronous, prev, pipe_out, fds_to_close); |
726f6388 | 2227 | |
335de49a | 2228 | #if defined (JOB_CONTROL) |
495aee44 CR |
2229 | if (lstdin > 0) |
2230 | restore_stdin (lstdin); | |
335de49a | 2231 | #endif |
495aee44 | 2232 | |
ccc6cda3 JA |
2233 | if (prev >= 0) |
2234 | close (prev); | |
726f6388 JA |
2235 | |
2236 | #if defined (JOB_CONTROL) | |
ccc6cda3 | 2237 | UNBLOCK_CHILD (oset); |
726f6388 | 2238 | #endif |
726f6388 | 2239 | |
3185942a | 2240 | QUIT; |
495aee44 CR |
2241 | |
2242 | if (lastpipe_flag) | |
2243 | { | |
2244 | #if defined (JOB_CONTROL) | |
2245 | append_process (savestring (the_printed_command), dollar_dollar_pid, exec_result, lastpipe_jid); | |
2246 | #endif | |
2247 | lstdin = wait_for (lastpid); | |
2248 | #if defined (JOB_CONTROL) | |
2249 | exec_result = job_exit_status (lastpipe_jid); | |
2250 | #endif | |
2251 | unfreeze_jobs_list (); | |
2252 | } | |
2253 | ||
72347977 | 2254 | #if defined (JOB_CONTROL) |
495aee44 | 2255 | discard_unwind_frame ("lastpipe-exec"); |
72347977 | 2256 | #endif |
495aee44 | 2257 | |
ccc6cda3 JA |
2258 | return (exec_result); |
2259 | } | |
2260 | ||
2261 | static int | |
2262 | execute_connection (command, asynchronous, pipe_in, pipe_out, fds_to_close) | |
2263 | COMMAND *command; | |
2264 | int asynchronous, pipe_in, pipe_out; | |
2265 | struct fd_bitmap *fds_to_close; | |
2266 | { | |
ccc6cda3 | 2267 | COMMAND *tc, *second; |
17345e5a | 2268 | int ignore_return, exec_result, was_error_trap, invert; |
89a92869 | 2269 | volatile int save_line_number; |
ccc6cda3 JA |
2270 | |
2271 | ignore_return = (command->flags & CMD_IGNORE_RETURN) != 0; | |
2272 | ||
2273 | switch (command->value.Connection->connector) | |
2274 | { | |
2275 | /* Do the first command asynchronously. */ | |
2276 | case '&': | |
2277 | tc = command->value.Connection->first; | |
2278 | if (tc == 0) | |
2279 | return (EXECUTION_SUCCESS); | |
2280 | ||
d166f048 | 2281 | if (ignore_return) |
ccc6cda3 | 2282 | tc->flags |= CMD_IGNORE_RETURN; |
d166f048 | 2283 | tc->flags |= CMD_AMPERSAND; |
ccc6cda3 | 2284 | |
f73dda09 JA |
2285 | /* If this shell was compiled without job control support, |
2286 | if we are currently in a subshell via `( xxx )', or if job | |
2287 | control is not active then the standard input for an | |
2288 | asynchronous command is forced to /dev/null. */ | |
ccc6cda3 | 2289 | #if defined (JOB_CONTROL) |
f73dda09 | 2290 | if ((subshell_environment || !job_control) && !stdin_redir) |
ccc6cda3 JA |
2291 | #else |
2292 | if (!stdin_redir) | |
2293 | #endif /* JOB_CONTROL */ | |
7117c2d2 | 2294 | tc->flags |= CMD_STDIN_REDIR; |
ccc6cda3 JA |
2295 | |
2296 | exec_result = execute_command_internal (tc, 1, pipe_in, pipe_out, fds_to_close); | |
3185942a | 2297 | QUIT; |
ccc6cda3 | 2298 | |
d166f048 | 2299 | if (tc->flags & CMD_STDIN_REDIR) |
7117c2d2 | 2300 | tc->flags &= ~CMD_STDIN_REDIR; |
726f6388 | 2301 | |
ccc6cda3 JA |
2302 | second = command->value.Connection->second; |
2303 | if (second) | |
2304 | { | |
2305 | if (ignore_return) | |
2306 | second->flags |= CMD_IGNORE_RETURN; | |
726f6388 | 2307 | |
ccc6cda3 JA |
2308 | exec_result = execute_command_internal (second, asynchronous, pipe_in, pipe_out, fds_to_close); |
2309 | } | |
726f6388 | 2310 | |
ccc6cda3 | 2311 | break; |
726f6388 | 2312 | |
ccc6cda3 JA |
2313 | /* Just call execute command on both sides. */ |
2314 | case ';': | |
2315 | if (ignore_return) | |
2316 | { | |
2317 | if (command->value.Connection->first) | |
2318 | command->value.Connection->first->flags |= CMD_IGNORE_RETURN; | |
2319 | if (command->value.Connection->second) | |
2320 | command->value.Connection->second->flags |= CMD_IGNORE_RETURN; | |
726f6388 | 2321 | } |
3185942a | 2322 | executing_list++; |
ccc6cda3 JA |
2323 | QUIT; |
2324 | execute_command (command->value.Connection->first); | |
2325 | QUIT; | |
2326 | exec_result = execute_command_internal (command->value.Connection->second, | |
2327 | asynchronous, pipe_in, pipe_out, | |
2328 | fds_to_close); | |
3185942a | 2329 | executing_list--; |
726f6388 JA |
2330 | break; |
2331 | ||
ccc6cda3 | 2332 | case '|': |
17345e5a JA |
2333 | was_error_trap = signal_is_trapped (ERROR_TRAP) && signal_is_ignored (ERROR_TRAP) == 0; |
2334 | invert = (command->flags & CMD_INVERT_RETURN) != 0; | |
2335 | ignore_return = (command->flags & CMD_IGNORE_RETURN) != 0; | |
2336 | ||
89a92869 | 2337 | line_number_for_err_trap = line_number; |
ccc6cda3 | 2338 | exec_result = execute_pipeline (command, asynchronous, pipe_in, pipe_out, fds_to_close); |
17345e5a JA |
2339 | |
2340 | if (was_error_trap && ignore_return == 0 && invert == 0 && exec_result != EXECUTION_SUCCESS) | |
2341 | { | |
2342 | last_command_exit_value = exec_result; | |
89a92869 CR |
2343 | save_line_number = line_number; |
2344 | line_number = line_number_for_err_trap; | |
17345e5a | 2345 | run_error_trap (); |
89a92869 | 2346 | line_number = save_line_number; |
17345e5a JA |
2347 | } |
2348 | ||
2349 | if (ignore_return == 0 && invert == 0 && exit_immediately_on_error && exec_result != EXECUTION_SUCCESS) | |
2350 | { | |
2351 | last_command_exit_value = exec_result; | |
2352 | run_pending_traps (); | |
2353 | jump_to_top_level (ERREXIT); | |
2354 | } | |
2355 | ||
726f6388 JA |
2356 | break; |
2357 | ||
ccc6cda3 JA |
2358 | case AND_AND: |
2359 | case OR_OR: | |
2360 | if (asynchronous) | |
2361 | { | |
2362 | /* If we have something like `a && b &' or `a || b &', run the | |
2363 | && or || stuff in a subshell. Force a subshell and just call | |
2364 | execute_command_internal again. Leave asynchronous on | |
2365 | so that we get a report from the parent shell about the | |
2366 | background job. */ | |
2367 | command->flags |= CMD_FORCE_SUBSHELL; | |
2368 | exec_result = execute_command_internal (command, 1, pipe_in, pipe_out, fds_to_close); | |
2369 | break; | |
2370 | } | |
726f6388 | 2371 | |
ccc6cda3 JA |
2372 | /* Execute the first command. If the result of that is successful |
2373 | and the connector is AND_AND, or the result is not successful | |
2374 | and the connector is OR_OR, then execute the second command, | |
2375 | otherwise return. */ | |
726f6388 | 2376 | |
3185942a | 2377 | executing_list++; |
ccc6cda3 JA |
2378 | if (command->value.Connection->first) |
2379 | command->value.Connection->first->flags |= CMD_IGNORE_RETURN; | |
726f6388 | 2380 | |
ccc6cda3 JA |
2381 | exec_result = execute_command (command->value.Connection->first); |
2382 | QUIT; | |
2383 | if (((command->value.Connection->connector == AND_AND) && | |
2384 | (exec_result == EXECUTION_SUCCESS)) || | |
2385 | ((command->value.Connection->connector == OR_OR) && | |
2386 | (exec_result != EXECUTION_SUCCESS))) | |
2387 | { | |
2388 | if (ignore_return && command->value.Connection->second) | |
2389 | command->value.Connection->second->flags |= CMD_IGNORE_RETURN; | |
726f6388 | 2390 | |
ccc6cda3 JA |
2391 | exec_result = execute_command (command->value.Connection->second); |
2392 | } | |
3185942a | 2393 | executing_list--; |
ccc6cda3 JA |
2394 | break; |
2395 | ||
2396 | default: | |
b72432fd | 2397 | command_error ("execute_connection", CMDERR_BADCONN, command->value.Connection->connector, 0); |
ccc6cda3 JA |
2398 | jump_to_top_level (DISCARD); |
2399 | exec_result = EXECUTION_FAILURE; | |
726f6388 JA |
2400 | } |
2401 | ||
ccc6cda3 | 2402 | return exec_result; |
726f6388 JA |
2403 | } |
2404 | ||
bb70624e JA |
2405 | #define REAP() \ |
2406 | do \ | |
2407 | { \ | |
2408 | if (!interactive_shell) \ | |
2409 | reap_dead_jobs (); \ | |
2410 | } \ | |
2411 | while (0) | |
726f6388 JA |
2412 | |
2413 | /* Execute a FOR command. The syntax is: FOR word_desc IN word_list; | |
2414 | DO command; DONE */ | |
ccc6cda3 | 2415 | static int |
726f6388 JA |
2416 | execute_for_command (for_command) |
2417 | FOR_COM *for_command; | |
2418 | { | |
726f6388 | 2419 | register WORD_LIST *releaser, *list; |
ccc6cda3 | 2420 | SHELL_VAR *v; |
726f6388 | 2421 | char *identifier; |
b80f6443 | 2422 | int retval, save_line_number; |
ccc6cda3 | 2423 | #if 0 |
726f6388 | 2424 | SHELL_VAR *old_value = (SHELL_VAR *)NULL; /* Remember the old value of x. */ |
ccc6cda3 | 2425 | #endif |
726f6388 | 2426 | |
b80f6443 | 2427 | save_line_number = line_number; |
726f6388 | 2428 | if (check_identifier (for_command->name, 1) == 0) |
ccc6cda3 JA |
2429 | { |
2430 | if (posixly_correct && interactive_shell == 0) | |
cce855bc | 2431 | { |
3185942a | 2432 | last_command_exit_value = EX_BADUSAGE; |
b80f6443 | 2433 | jump_to_top_level (ERREXIT); |
cce855bc | 2434 | } |
ccc6cda3 JA |
2435 | return (EXECUTION_FAILURE); |
2436 | } | |
726f6388 JA |
2437 | |
2438 | loop_level++; | |
2439 | identifier = for_command->name->word; | |
2440 | ||
2441 | list = releaser = expand_words_no_vars (for_command->map_list); | |
2442 | ||
2443 | begin_unwind_frame ("for"); | |
2444 | add_unwind_protect (dispose_words, releaser); | |
2445 | ||
ccc6cda3 | 2446 | #if 0 |
726f6388 JA |
2447 | if (lexical_scoping) |
2448 | { | |
2449 | old_value = copy_variable (find_variable (identifier)); | |
2450 | if (old_value) | |
2451 | add_unwind_protect (dispose_variable, old_value); | |
2452 | } | |
ccc6cda3 | 2453 | #endif |
726f6388 JA |
2454 | |
2455 | if (for_command->flags & CMD_IGNORE_RETURN) | |
2456 | for_command->action->flags |= CMD_IGNORE_RETURN; | |
2457 | ||
ccc6cda3 | 2458 | for (retval = EXECUTION_SUCCESS; list; list = list->next) |
726f6388 JA |
2459 | { |
2460 | QUIT; | |
b80f6443 JA |
2461 | |
2462 | line_number = for_command->line; | |
2463 | ||
2464 | /* Remember what this command looks like, for debugger. */ | |
2465 | command_string_index = 0; | |
2466 | print_for_command_head (for_command); | |
2467 | ||
2468 | if (echo_command_at_execute) | |
2469 | xtrace_print_for_command_head (for_command); | |
2470 | ||
95732b49 JA |
2471 | /* Save this command unless it's a trap command and we're not running |
2472 | a debug trap. */ | |
0628567a | 2473 | #if 0 |
95732b49 | 2474 | if (signal_in_progress (DEBUG_TRAP) == 0 && (this_command_name == 0 || (STREQ (this_command_name, "trap") == 0))) |
0628567a JA |
2475 | #else |
2476 | if (signal_in_progress (DEBUG_TRAP) == 0 && running_trap == 0) | |
2477 | #endif | |
b80f6443 JA |
2478 | { |
2479 | FREE (the_printed_command_except_trap); | |
2480 | the_printed_command_except_trap = savestring (the_printed_command); | |
2481 | } | |
2482 | ||
2483 | retval = run_debug_trap (); | |
2484 | #if defined (DEBUGGER) | |
2485 | /* In debugging mode, if the DEBUG trap returns a non-zero status, we | |
2486 | skip the command. */ | |
2487 | if (debugging_mode && retval != EXECUTION_SUCCESS) | |
2488 | continue; | |
2489 | #endif | |
2490 | ||
ccc6cda3 | 2491 | this_command_name = (char *)NULL; |
95732b49 | 2492 | v = bind_variable (identifier, list->word->word, 0); |
28ef6c31 | 2493 | if (readonly_p (v) || noassign_p (v)) |
ccc6cda3 | 2494 | { |
b80f6443 | 2495 | line_number = save_line_number; |
28ef6c31 | 2496 | if (readonly_p (v) && interactive_shell == 0 && posixly_correct) |
ccc6cda3 JA |
2497 | { |
2498 | last_command_exit_value = EXECUTION_FAILURE; | |
2499 | jump_to_top_level (FORCE_EOF); | |
2500 | } | |
2501 | else | |
2502 | { | |
b80f6443 JA |
2503 | dispose_words (releaser); |
2504 | discard_unwind_frame ("for"); | |
d166f048 | 2505 | loop_level--; |
ccc6cda3 JA |
2506 | return (EXECUTION_FAILURE); |
2507 | } | |
2508 | } | |
2509 | retval = execute_command (for_command->action); | |
726f6388 JA |
2510 | REAP (); |
2511 | QUIT; | |
2512 | ||
2513 | if (breaking) | |
2514 | { | |
ccc6cda3 | 2515 | breaking--; |
726f6388 JA |
2516 | break; |
2517 | } | |
2518 | ||
2519 | if (continuing) | |
2520 | { | |
2521 | continuing--; | |
2522 | if (continuing) | |
2523 | break; | |
2524 | } | |
726f6388 JA |
2525 | } |
2526 | ||
2527 | loop_level--; | |
b80f6443 | 2528 | line_number = save_line_number; |
726f6388 | 2529 | |
ccc6cda3 | 2530 | #if 0 |
726f6388 JA |
2531 | if (lexical_scoping) |
2532 | { | |
2533 | if (!old_value) | |
7117c2d2 | 2534 | unbind_variable (identifier); |
726f6388 JA |
2535 | else |
2536 | { | |
2537 | SHELL_VAR *new_value; | |
2538 | ||
95732b49 | 2539 | new_value = bind_variable (identifier, value_cell(old_value), 0); |
726f6388 JA |
2540 | new_value->attributes = old_value->attributes; |
2541 | dispose_variable (old_value); | |
2542 | } | |
2543 | } | |
ccc6cda3 | 2544 | #endif |
726f6388 JA |
2545 | |
2546 | dispose_words (releaser); | |
2547 | discard_unwind_frame ("for"); | |
2548 | return (retval); | |
2549 | } | |
2550 | ||
bb70624e JA |
2551 | #if defined (ARITH_FOR_COMMAND) |
2552 | /* Execute an arithmetic for command. The syntax is | |
2553 | ||
2554 | for (( init ; step ; test )) | |
2555 | do | |
2556 | body | |
2557 | done | |
2558 | ||
2559 | The execution should be exactly equivalent to | |
2560 | ||
2561 | eval \(\( init \)\) | |
2562 | while eval \(\( test \)\) ; do | |
2563 | body; | |
2564 | eval \(\( step \)\) | |
2565 | done | |
2566 | */ | |
7117c2d2 | 2567 | static intmax_t |
bb70624e JA |
2568 | eval_arith_for_expr (l, okp) |
2569 | WORD_LIST *l; | |
2570 | int *okp; | |
2571 | { | |
2572 | WORD_LIST *new; | |
7117c2d2 | 2573 | intmax_t expresult; |
b80f6443 | 2574 | int r; |
bb70624e JA |
2575 | |
2576 | new = expand_words_no_vars (l); | |
f73dda09 JA |
2577 | if (new) |
2578 | { | |
2579 | if (echo_command_at_execute) | |
2580 | xtrace_print_arith_cmd (new); | |
7117c2d2 | 2581 | this_command_name = "(("; /* )) for expression error messages */ |
b80f6443 JA |
2582 | |
2583 | command_string_index = 0; | |
2584 | print_arith_command (new); | |
95732b49 JA |
2585 | if (signal_in_progress (DEBUG_TRAP) == 0) |
2586 | { | |
2587 | FREE (the_printed_command_except_trap); | |
2588 | the_printed_command_except_trap = savestring (the_printed_command); | |
2589 | } | |
b80f6443 JA |
2590 | |
2591 | r = run_debug_trap (); | |
2592 | /* In debugging mode, if the DEBUG trap returns a non-zero status, we | |
2593 | skip the command. */ | |
2594 | #if defined (DEBUGGER) | |
2595 | if (debugging_mode == 0 || r == EXECUTION_SUCCESS) | |
2596 | expresult = evalexp (new->word->word, okp); | |
2597 | else | |
2598 | { | |
2599 | expresult = 0; | |
2600 | if (okp) | |
2601 | *okp = 1; | |
2602 | } | |
2603 | #else | |
f73dda09 | 2604 | expresult = evalexp (new->word->word, okp); |
b80f6443 | 2605 | #endif |
f73dda09 JA |
2606 | dispose_words (new); |
2607 | } | |
2608 | else | |
2609 | { | |
2610 | expresult = 0; | |
2611 | if (okp) | |
2612 | *okp = 1; | |
2613 | } | |
bb70624e JA |
2614 | return (expresult); |
2615 | } | |
2616 | ||
2617 | static int | |
2618 | execute_arith_for_command (arith_for_command) | |
2619 | ARITH_FOR_COM *arith_for_command; | |
2620 | { | |
7117c2d2 JA |
2621 | intmax_t expresult; |
2622 | int expok, body_status, arith_lineno, save_lineno; | |
bb70624e JA |
2623 | |
2624 | body_status = EXECUTION_SUCCESS; | |
2625 | loop_level++; | |
b80f6443 | 2626 | save_lineno = line_number; |
bb70624e JA |
2627 | |
2628 | if (arith_for_command->flags & CMD_IGNORE_RETURN) | |
2629 | arith_for_command->action->flags |= CMD_IGNORE_RETURN; | |
2630 | ||
2631 | this_command_name = "(("; /* )) for expression error messages */ | |
2632 | ||
7117c2d2 JA |
2633 | /* save the starting line number of the command so we can reset |
2634 | line_number before executing each expression -- for $LINENO | |
2635 | and the DEBUG trap. */ | |
b80f6443 | 2636 | line_number = arith_lineno = arith_for_command->line; |
7117c2d2 | 2637 | if (variable_context && interactive_shell) |
b80f6443 | 2638 | line_number -= function_line_number; |
bb70624e JA |
2639 | |
2640 | /* Evaluate the initialization expression. */ | |
2641 | expresult = eval_arith_for_expr (arith_for_command->init, &expok); | |
2642 | if (expok == 0) | |
b80f6443 JA |
2643 | { |
2644 | line_number = save_lineno; | |
2645 | return (EXECUTION_FAILURE); | |
2646 | } | |
bb70624e JA |
2647 | |
2648 | while (1) | |
2649 | { | |
2650 | /* Evaluate the test expression. */ | |
7117c2d2 | 2651 | line_number = arith_lineno; |
bb70624e | 2652 | expresult = eval_arith_for_expr (arith_for_command->test, &expok); |
7117c2d2 JA |
2653 | line_number = save_lineno; |
2654 | ||
bb70624e JA |
2655 | if (expok == 0) |
2656 | { | |
2657 | body_status = EXECUTION_FAILURE; | |
2658 | break; | |
2659 | } | |
2660 | REAP (); | |
2661 | if (expresult == 0) | |
28ef6c31 | 2662 | break; |
bb70624e JA |
2663 | |
2664 | /* Execute the body of the arithmetic for command. */ | |
2665 | QUIT; | |
2666 | body_status = execute_command (arith_for_command->action); | |
2667 | QUIT; | |
2668 | ||
2669 | /* Handle any `break' or `continue' commands executed by the body. */ | |
2670 | if (breaking) | |
2671 | { | |
2672 | breaking--; | |
2673 | break; | |
2674 | } | |
2675 | ||
2676 | if (continuing) | |
2677 | { | |
2678 | continuing--; | |
2679 | if (continuing) | |
2680 | break; | |
2681 | } | |
2682 | ||
2683 | /* Evaluate the step expression. */ | |
7117c2d2 | 2684 | line_number = arith_lineno; |
bb70624e | 2685 | expresult = eval_arith_for_expr (arith_for_command->step, &expok); |
7117c2d2 JA |
2686 | line_number = save_lineno; |
2687 | ||
bb70624e JA |
2688 | if (expok == 0) |
2689 | { | |
2690 | body_status = EXECUTION_FAILURE; | |
2691 | break; | |
2692 | } | |
2693 | } | |
2694 | ||
2695 | loop_level--; | |
b80f6443 JA |
2696 | line_number = save_lineno; |
2697 | ||
bb70624e JA |
2698 | return (body_status); |
2699 | } | |
2700 | #endif | |
2701 | ||
726f6388 JA |
2702 | #if defined (SELECT_COMMAND) |
2703 | static int LINES, COLS, tabsize; | |
2704 | ||
2705 | #define RP_SPACE ") " | |
2706 | #define RP_SPACE_LEN 2 | |
2707 | ||
2708 | /* XXX - does not handle numbers > 1000000 at all. */ | |
2709 | #define NUMBER_LEN(s) \ | |
2710 | ((s < 10) ? 1 \ | |
2711 | : ((s < 100) ? 2 \ | |
2712 | : ((s < 1000) ? 3 \ | |
2713 | : ((s < 10000) ? 4 \ | |
2714 | : ((s < 100000) ? 5 \ | |
2715 | : 6))))) | |
2716 | ||
495aee44 CR |
2717 | static int |
2718 | displen (s) | |
2719 | const char *s; | |
2720 | { | |
2721 | #if defined (HANDLE_MULTIBYTE) | |
2722 | wchar_t *wcstr; | |
2723 | size_t wclen, slen; | |
2724 | ||
2725 | wcstr = 0; | |
2726 | slen = mbstowcs (wcstr, s, 0); | |
2727 | if (slen == -1) | |
2728 | slen = 0; | |
2729 | wcstr = (wchar_t *)xmalloc (sizeof (wchar_t) * (slen + 1)); | |
2730 | mbstowcs (wcstr, s, slen + 1); | |
2731 | wclen = wcswidth (wcstr, slen); | |
2732 | free (wcstr); | |
2733 | return ((int)wclen); | |
2734 | #else | |
2735 | return (STRLEN (s)); | |
2736 | #endif | |
2737 | } | |
2738 | ||
726f6388 JA |
2739 | static int |
2740 | print_index_and_element (len, ind, list) | |
2741 | int len, ind; | |
2742 | WORD_LIST *list; | |
2743 | { | |
2744 | register WORD_LIST *l; | |
2745 | register int i; | |
2746 | ||
2747 | if (list == 0) | |
2748 | return (0); | |
ccc6cda3 JA |
2749 | for (i = ind, l = list; l && --i; l = l->next) |
2750 | ; | |
726f6388 | 2751 | fprintf (stderr, "%*d%s%s", len, ind, RP_SPACE, l->word->word); |
495aee44 | 2752 | return (displen (l->word->word)); |
726f6388 JA |
2753 | } |
2754 | ||
2755 | static void | |
2756 | indent (from, to) | |
2757 | int from, to; | |
2758 | { | |
2759 | while (from < to) | |
2760 | { | |
2761 | if ((to / tabsize) > (from / tabsize)) | |
2762 | { | |
2763 | putc ('\t', stderr); | |
2764 | from += tabsize - from % tabsize; | |
2765 | } | |
2766 | else | |
2767 | { | |
2768 | putc (' ', stderr); | |
2769 | from++; | |
2770 | } | |
2771 | } | |
2772 | } | |
2773 | ||
2774 | static void | |
2775 | print_select_list (list, list_len, max_elem_len, indices_len) | |
2776 | WORD_LIST *list; | |
2777 | int list_len, max_elem_len, indices_len; | |
2778 | { | |
2779 | int ind, row, elem_len, pos, cols, rows; | |
2780 | int first_column_indices_len, other_indices_len; | |
2781 | ||
2782 | if (list == 0) | |
2783 | { | |
2784 | putc ('\n', stderr); | |
2785 | return; | |
2786 | } | |
2787 | ||
ccc6cda3 | 2788 | cols = max_elem_len ? COLS / max_elem_len : 1; |
726f6388 JA |
2789 | if (cols == 0) |
2790 | cols = 1; | |
2791 | rows = list_len ? list_len / cols + (list_len % cols != 0) : 1; | |
2792 | cols = list_len ? list_len / rows + (list_len % rows != 0) : 1; | |
2793 | ||
2794 | if (rows == 1) | |
2795 | { | |
2796 | rows = cols; | |
2797 | cols = 1; | |
2798 | } | |
2799 | ||
2800 | first_column_indices_len = NUMBER_LEN (rows); | |
2801 | other_indices_len = indices_len; | |
2802 | ||
2803 | for (row = 0; row < rows; row++) | |
2804 | { | |
2805 | ind = row; | |
2806 | pos = 0; | |
2807 | while (1) | |
2808 | { | |
2809 | indices_len = (pos == 0) ? first_column_indices_len : other_indices_len; | |
2810 | elem_len = print_index_and_element (indices_len, ind + 1, list); | |
2811 | elem_len += indices_len + RP_SPACE_LEN; | |
2812 | ind += rows; | |
2813 | if (ind >= list_len) | |
2814 | break; | |
2815 | indent (pos + elem_len, pos + max_elem_len); | |
2816 | pos += max_elem_len; | |
2817 | } | |
2818 | putc ('\n', stderr); | |
2819 | } | |
2820 | } | |
2821 | ||
2822 | /* Print the elements of LIST, one per line, preceded by an index from 1 to | |
2823 | LIST_LEN. Then display PROMPT and wait for the user to enter a number. | |
2824 | If the number is between 1 and LIST_LEN, return that selection. If EOF | |
e8ce775d JA |
2825 | is read, return a null string. If a blank line is entered, or an invalid |
2826 | number is entered, the loop is executed again. */ | |
726f6388 | 2827 | static char * |
7117c2d2 | 2828 | select_query (list, list_len, prompt, print_menu) |
726f6388 JA |
2829 | WORD_LIST *list; |
2830 | int list_len; | |
2831 | char *prompt; | |
7117c2d2 | 2832 | int print_menu; |
726f6388 | 2833 | { |
e8ce775d | 2834 | int max_elem_len, indices_len, len; |
7117c2d2 | 2835 | intmax_t reply; |
726f6388 JA |
2836 | WORD_LIST *l; |
2837 | char *repl_string, *t; | |
2838 | ||
495aee44 | 2839 | #if 0 |
726f6388 JA |
2840 | t = get_string_value ("LINES"); |
2841 | LINES = (t && *t) ? atoi (t) : 24; | |
495aee44 | 2842 | #endif |
726f6388 JA |
2843 | t = get_string_value ("COLUMNS"); |
2844 | COLS = (t && *t) ? atoi (t) : 80; | |
2845 | ||
2846 | #if 0 | |
2847 | t = get_string_value ("TABSIZE"); | |
2848 | tabsize = (t && *t) ? atoi (t) : 8; | |
2849 | if (tabsize <= 0) | |
2850 | tabsize = 8; | |
2851 | #else | |
2852 | tabsize = 8; | |
2853 | #endif | |
2854 | ||
2855 | max_elem_len = 0; | |
2856 | for (l = list; l; l = l->next) | |
2857 | { | |
495aee44 | 2858 | len = displen (l->word->word); |
726f6388 | 2859 | if (len > max_elem_len) |
cce855bc | 2860 | max_elem_len = len; |
726f6388 JA |
2861 | } |
2862 | indices_len = NUMBER_LEN (list_len); | |
2863 | max_elem_len += indices_len + RP_SPACE_LEN + 2; | |
2864 | ||
2865 | while (1) | |
2866 | { | |
7117c2d2 JA |
2867 | if (print_menu) |
2868 | print_select_list (list, list_len, max_elem_len, indices_len); | |
ccc6cda3 JA |
2869 | fprintf (stderr, "%s", prompt); |
2870 | fflush (stderr); | |
726f6388 JA |
2871 | QUIT; |
2872 | ||
495aee44 | 2873 | if (read_builtin ((WORD_LIST *)NULL) != EXECUTION_SUCCESS) |
726f6388 JA |
2874 | { |
2875 | putchar ('\n'); | |
2876 | return ((char *)NULL); | |
2877 | } | |
2878 | repl_string = get_string_value ("REPLY"); | |
2879 | if (*repl_string == 0) | |
7117c2d2 JA |
2880 | { |
2881 | print_menu = 1; | |
2882 | continue; | |
2883 | } | |
e8ce775d | 2884 | if (legal_number (repl_string, &reply) == 0) |
cce855bc | 2885 | return ""; |
726f6388 JA |
2886 | if (reply < 1 || reply > list_len) |
2887 | return ""; | |
2888 | ||
ccc6cda3 JA |
2889 | for (l = list; l && --reply; l = l->next) |
2890 | ; | |
726f6388 JA |
2891 | return (l->word->word); |
2892 | } | |
2893 | } | |
2894 | ||
2895 | /* Execute a SELECT command. The syntax is: | |
2896 | SELECT word IN list DO command_list DONE | |
2897 | Only `break' or `return' in command_list will terminate | |
2898 | the command. */ | |
ccc6cda3 | 2899 | static int |
726f6388 JA |
2900 | execute_select_command (select_command) |
2901 | SELECT_COM *select_command; | |
2902 | { | |
2903 | WORD_LIST *releaser, *list; | |
ccc6cda3 | 2904 | SHELL_VAR *v; |
726f6388 | 2905 | char *identifier, *ps3_prompt, *selection; |
b80f6443 | 2906 | int retval, list_len, show_menu, save_line_number; |
7117c2d2 | 2907 | |
726f6388 JA |
2908 | if (check_identifier (select_command->name, 1) == 0) |
2909 | return (EXECUTION_FAILURE); | |
2910 | ||
b80f6443 JA |
2911 | save_line_number = line_number; |
2912 | line_number = select_command->line; | |
2913 | ||
2914 | command_string_index = 0; | |
2915 | print_select_command_head (select_command); | |
2916 | ||
2917 | if (echo_command_at_execute) | |
2918 | xtrace_print_select_command_head (select_command); | |
2919 | ||
0628567a | 2920 | #if 0 |
95732b49 | 2921 | if (signal_in_progress (DEBUG_TRAP) == 0 && (this_command_name == 0 || (STREQ (this_command_name, "trap") == 0))) |
0628567a JA |
2922 | #else |
2923 | if (signal_in_progress (DEBUG_TRAP) == 0 && running_trap == 0) | |
2924 | #endif | |
95732b49 JA |
2925 | { |
2926 | FREE (the_printed_command_except_trap); | |
2927 | the_printed_command_except_trap = savestring (the_printed_command); | |
2928 | } | |
b80f6443 JA |
2929 | |
2930 | retval = run_debug_trap (); | |
2931 | #if defined (DEBUGGER) | |
2932 | /* In debugging mode, if the DEBUG trap returns a non-zero status, we | |
2933 | skip the command. */ | |
2934 | if (debugging_mode && retval != EXECUTION_SUCCESS) | |
2935 | return (EXECUTION_SUCCESS); | |
2936 | #endif | |
2937 | ||
726f6388 JA |
2938 | loop_level++; |
2939 | identifier = select_command->name->word; | |
2940 | ||
2941 | /* command and arithmetic substitution, parameter and variable expansion, | |
2942 | word splitting, pathname expansion, and quote removal. */ | |
2943 | list = releaser = expand_words_no_vars (select_command->map_list); | |
2944 | list_len = list_length (list); | |
2945 | if (list == 0 || list_len == 0) | |
2946 | { | |
2947 | if (list) | |
2948 | dispose_words (list); | |
b80f6443 | 2949 | line_number = save_line_number; |
726f6388 JA |
2950 | return (EXECUTION_SUCCESS); |
2951 | } | |
2952 | ||
2953 | begin_unwind_frame ("select"); | |
2954 | add_unwind_protect (dispose_words, releaser); | |
2955 | ||
726f6388 JA |
2956 | if (select_command->flags & CMD_IGNORE_RETURN) |
2957 | select_command->action->flags |= CMD_IGNORE_RETURN; | |
2958 | ||
ccc6cda3 | 2959 | retval = EXECUTION_SUCCESS; |
7117c2d2 | 2960 | show_menu = 1; |
ccc6cda3 | 2961 | |
726f6388 JA |
2962 | while (1) |
2963 | { | |
b80f6443 | 2964 | line_number = select_command->line; |
726f6388 | 2965 | ps3_prompt = get_string_value ("PS3"); |
ccc6cda3 | 2966 | if (ps3_prompt == 0) |
726f6388 JA |
2967 | ps3_prompt = "#? "; |
2968 | ||
2969 | QUIT; | |
7117c2d2 | 2970 | selection = select_query (list, list_len, ps3_prompt, show_menu); |
726f6388 JA |
2971 | QUIT; |
2972 | if (selection == 0) | |
7117c2d2 JA |
2973 | { |
2974 | /* select_query returns EXECUTION_FAILURE if the read builtin | |
2975 | fails, so we want to return failure in this case. */ | |
2976 | retval = EXECUTION_FAILURE; | |
2977 | break; | |
2978 | } | |
ccc6cda3 | 2979 | |
95732b49 | 2980 | v = bind_variable (identifier, selection, 0); |
28ef6c31 | 2981 | if (readonly_p (v) || noassign_p (v)) |
ccc6cda3 | 2982 | { |
28ef6c31 | 2983 | if (readonly_p (v) && interactive_shell == 0 && posixly_correct) |
ccc6cda3 JA |
2984 | { |
2985 | last_command_exit_value = EXECUTION_FAILURE; | |
2986 | jump_to_top_level (FORCE_EOF); | |
2987 | } | |
2988 | else | |
2989 | { | |
b80f6443 JA |
2990 | dispose_words (releaser); |
2991 | discard_unwind_frame ("select"); | |
2992 | loop_level--; | |
2993 | line_number = save_line_number; | |
ccc6cda3 JA |
2994 | return (EXECUTION_FAILURE); |
2995 | } | |
2996 | } | |
726f6388 | 2997 | |
f73dda09 | 2998 | retval = execute_command (select_command->action); |
726f6388 JA |
2999 | |
3000 | REAP (); | |
3001 | QUIT; | |
3002 | ||
3003 | if (breaking) | |
3004 | { | |
3005 | breaking--; | |
3006 | break; | |
3007 | } | |
bb70624e JA |
3008 | |
3009 | if (continuing) | |
3010 | { | |
3011 | continuing--; | |
3012 | if (continuing) | |
3013 | break; | |
3014 | } | |
7117c2d2 JA |
3015 | |
3016 | #if defined (KSH_COMPATIBLE_SELECT) | |
3017 | show_menu = 0; | |
3018 | selection = get_string_value ("REPLY"); | |
3019 | if (selection && *selection == '\0') | |
3020 | show_menu = 1; | |
3021 | #endif | |
726f6388 JA |
3022 | } |
3023 | ||
3024 | loop_level--; | |
b80f6443 | 3025 | line_number = save_line_number; |
726f6388 | 3026 | |
b80f6443 JA |
3027 | dispose_words (releaser); |
3028 | discard_unwind_frame ("select"); | |
726f6388 JA |
3029 | return (retval); |
3030 | } | |
3031 | #endif /* SELECT_COMMAND */ | |
3032 | ||
3033 | /* Execute a CASE command. The syntax is: CASE word_desc IN pattern_list ESAC. | |
3034 | The pattern_list is a linked list of pattern clauses; each clause contains | |
3035 | some patterns to compare word_desc against, and an associated command to | |
3036 | execute. */ | |
ccc6cda3 | 3037 | static int |
726f6388 JA |
3038 | execute_case_command (case_command) |
3039 | CASE_COM *case_command; | |
3040 | { | |
3041 | register WORD_LIST *list; | |
ccc6cda3 | 3042 | WORD_LIST *wlist, *es; |
726f6388 | 3043 | PATTERN_LIST *clauses; |
ccc6cda3 | 3044 | char *word, *pattern; |
b80f6443 JA |
3045 | int retval, match, ignore_return, save_line_number; |
3046 | ||
3047 | save_line_number = line_number; | |
3048 | line_number = case_command->line; | |
3049 | ||
3050 | command_string_index = 0; | |
3051 | print_case_command_head (case_command); | |
3052 | ||
3053 | if (echo_command_at_execute) | |
3054 | xtrace_print_case_command_head (case_command); | |
3055 | ||
0628567a JA |
3056 | #if 0 |
3057 | if (signal_in_progress (DEBUG_TRAP) == 0 && (this_command_name == 0 || (STREQ (this_command_name, "trap") == 0))) | |
3058 | #else | |
3059 | if (signal_in_progress (DEBUG_TRAP) == 0 && running_trap == 0) | |
3060 | #endif | |
b80f6443 JA |
3061 | { |
3062 | FREE (the_printed_command_except_trap); | |
3063 | the_printed_command_except_trap = savestring (the_printed_command); | |
3064 | } | |
3065 | ||
3066 | retval = run_debug_trap(); | |
3067 | #if defined (DEBUGGER) | |
3068 | /* In debugging mode, if the DEBUG trap returns a non-zero status, we | |
3069 | skip the command. */ | |
3070 | if (debugging_mode && retval != EXECUTION_SUCCESS) | |
3071 | { | |
3072 | line_number = save_line_number; | |
3073 | return (EXECUTION_SUCCESS); | |
3074 | } | |
3075 | #endif | |
726f6388 | 3076 | |
28ef6c31 | 3077 | wlist = expand_word_unsplit (case_command->word, 0); |
ccc6cda3 JA |
3078 | word = wlist ? string_list (wlist) : savestring (""); |
3079 | dispose_words (wlist); | |
3080 | ||
726f6388 | 3081 | retval = EXECUTION_SUCCESS; |
ccc6cda3 | 3082 | ignore_return = case_command->flags & CMD_IGNORE_RETURN; |
726f6388 JA |
3083 | |
3084 | begin_unwind_frame ("case"); | |
726f6388 JA |
3085 | add_unwind_protect ((Function *)xfree, word); |
3086 | ||
ccc6cda3 JA |
3087 | #define EXIT_CASE() goto exit_case_command |
3088 | ||
3089 | for (clauses = case_command->clauses; clauses; clauses = clauses->next) | |
726f6388 JA |
3090 | { |
3091 | QUIT; | |
ccc6cda3 | 3092 | for (list = clauses->patterns; list; list = list->next) |
726f6388 | 3093 | { |
726f6388 JA |
3094 | es = expand_word_leave_quoted (list->word, 0); |
3095 | ||
3096 | if (es && es->word && es->word->word && *(es->word->word)) | |
cce855bc | 3097 | pattern = quote_string_for_globbing (es->word->word, QGLOB_CVTNULL); |
726f6388 | 3098 | else |
ccc6cda3 | 3099 | { |
f73dda09 | 3100 | pattern = (char *)xmalloc (1); |
ccc6cda3 JA |
3101 | pattern[0] = '\0'; |
3102 | } | |
726f6388 JA |
3103 | |
3104 | /* Since the pattern does not undergo quote removal (as per | |
f73dda09 | 3105 | Posix.2, section 3.9.4.3), the strmatch () call must be able |
726f6388 | 3106 | to recognize backslashes as escape characters. */ |
95732b49 | 3107 | match = strmatch (pattern, word, FNMATCH_EXTFLAG|FNMATCH_IGNCASE) != FNM_NOMATCH; |
726f6388 JA |
3108 | free (pattern); |
3109 | ||
3110 | dispose_words (es); | |
3111 | ||
3112 | if (match) | |
3113 | { | |
3185942a JA |
3114 | do |
3115 | { | |
3116 | if (clauses->action && ignore_return) | |
3117 | clauses->action->flags |= CMD_IGNORE_RETURN; | |
3118 | retval = execute_command (clauses->action); | |
3119 | } | |
3120 | while ((clauses->flags & CASEPAT_FALLTHROUGH) && (clauses = clauses->next)); | |
89a92869 | 3121 | if (clauses == 0 || (clauses->flags & CASEPAT_TESTNEXT) == 0) |
3185942a JA |
3122 | EXIT_CASE (); |
3123 | else | |
3124 | break; | |
726f6388 JA |
3125 | } |
3126 | ||
726f6388 JA |
3127 | QUIT; |
3128 | } | |
726f6388 JA |
3129 | } |
3130 | ||
ccc6cda3 JA |
3131 | exit_case_command: |
3132 | free (word); | |
726f6388 | 3133 | discard_unwind_frame ("case"); |
b80f6443 | 3134 | line_number = save_line_number; |
726f6388 JA |
3135 | return (retval); |
3136 | } | |
3137 | ||
3138 | #define CMD_WHILE 0 | |
3139 | #define CMD_UNTIL 1 | |
3140 | ||
3141 | /* The WHILE command. Syntax: WHILE test DO action; DONE. | |
3142 | Repeatedly execute action while executing test produces | |
3143 | EXECUTION_SUCCESS. */ | |
ccc6cda3 | 3144 | static int |
726f6388 JA |
3145 | execute_while_command (while_command) |
3146 | WHILE_COM *while_command; | |
3147 | { | |
3148 | return (execute_while_or_until (while_command, CMD_WHILE)); | |
3149 | } | |
3150 | ||
3151 | /* UNTIL is just like WHILE except that the test result is negated. */ | |
ccc6cda3 | 3152 | static int |
726f6388 JA |
3153 | execute_until_command (while_command) |
3154 | WHILE_COM *while_command; | |
3155 | { | |
3156 | return (execute_while_or_until (while_command, CMD_UNTIL)); | |
3157 | } | |
3158 | ||
3159 | /* The body for both while and until. The only difference between the | |
3160 | two is that the test value is treated differently. TYPE is | |
3161 | CMD_WHILE or CMD_UNTIL. The return value for both commands should | |
3162 | be EXECUTION_SUCCESS if no commands in the body are executed, and | |
3163 | the status of the last command executed in the body otherwise. */ | |
ccc6cda3 | 3164 | static int |
726f6388 JA |
3165 | execute_while_or_until (while_command, type) |
3166 | WHILE_COM *while_command; | |
3167 | int type; | |
3168 | { | |
3169 | int return_value, body_status; | |
3170 | ||
3171 | body_status = EXECUTION_SUCCESS; | |
3172 | loop_level++; | |
3173 | ||
3174 | while_command->test->flags |= CMD_IGNORE_RETURN; | |
3175 | if (while_command->flags & CMD_IGNORE_RETURN) | |
3176 | while_command->action->flags |= CMD_IGNORE_RETURN; | |
3177 | ||
3178 | while (1) | |
3179 | { | |
3180 | return_value = execute_command (while_command->test); | |
3181 | REAP (); | |
3182 | ||
f73dda09 JA |
3183 | /* Need to handle `break' in the test when we would break out of the |
3184 | loop. The job control code will set `breaking' to loop_level | |
3185 | when a job in a loop is stopped with SIGTSTP. If the stopped job | |
3186 | is in the loop test, `breaking' will not be reset unless we do | |
3187 | this, and the shell will cease to execute commands. */ | |
726f6388 | 3188 | if (type == CMD_WHILE && return_value != EXECUTION_SUCCESS) |
f73dda09 JA |
3189 | { |
3190 | if (breaking) | |
3191 | breaking--; | |
3192 | break; | |
3193 | } | |
726f6388 | 3194 | if (type == CMD_UNTIL && return_value == EXECUTION_SUCCESS) |
f73dda09 JA |
3195 | { |
3196 | if (breaking) | |
3197 | breaking--; | |
3198 | break; | |
3199 | } | |
726f6388 JA |
3200 | |
3201 | QUIT; | |
3202 | body_status = execute_command (while_command->action); | |
3203 | QUIT; | |
3204 | ||
3205 | if (breaking) | |
3206 | { | |
3207 | breaking--; | |
3208 | break; | |
3209 | } | |
3210 | ||
3211 | if (continuing) | |
3212 | { | |
3213 | continuing--; | |
3214 | if (continuing) | |
3215 | break; | |
3216 | } | |
3217 | } | |
3218 | loop_level--; | |
3219 | ||
3220 | return (body_status); | |
3221 | } | |
3222 | ||
3223 | /* IF test THEN command [ELSE command]. | |
3224 | IF also allows ELIF in the place of ELSE IF, but | |
3225 | the parser makes *that* stupidity transparent. */ | |
ccc6cda3 | 3226 | static int |
726f6388 JA |
3227 | execute_if_command (if_command) |
3228 | IF_COM *if_command; | |
3229 | { | |
b80f6443 | 3230 | int return_value, save_line_number; |
726f6388 | 3231 | |
b80f6443 | 3232 | save_line_number = line_number; |
726f6388 JA |
3233 | if_command->test->flags |= CMD_IGNORE_RETURN; |
3234 | return_value = execute_command (if_command->test); | |
b80f6443 | 3235 | line_number = save_line_number; |
726f6388 JA |
3236 | |
3237 | if (return_value == EXECUTION_SUCCESS) | |
3238 | { | |
3239 | QUIT; | |
ccc6cda3 | 3240 | |
726f6388 | 3241 | if (if_command->true_case && (if_command->flags & CMD_IGNORE_RETURN)) |
ccc6cda3 JA |
3242 | if_command->true_case->flags |= CMD_IGNORE_RETURN; |
3243 | ||
726f6388 JA |
3244 | return (execute_command (if_command->true_case)); |
3245 | } | |
3246 | else | |
3247 | { | |
3248 | QUIT; | |
3249 | ||
3250 | if (if_command->false_case && (if_command->flags & CMD_IGNORE_RETURN)) | |
3251 | if_command->false_case->flags |= CMD_IGNORE_RETURN; | |
3252 | ||
3253 | return (execute_command (if_command->false_case)); | |
3254 | } | |
3255 | } | |
3256 | ||
cce855bc JA |
3257 | #if defined (DPAREN_ARITHMETIC) |
3258 | static int | |
3259 | execute_arith_command (arith_command) | |
3260 | ARITH_COM *arith_command; | |
3261 | { | |
b80f6443 | 3262 | int expok, save_line_number, retval; |
7117c2d2 | 3263 | intmax_t expresult; |
f73dda09 | 3264 | WORD_LIST *new; |
0628567a | 3265 | char *exp; |
cce855bc | 3266 | |
f73dda09 | 3267 | expresult = 0; |
cce855bc | 3268 | |
b80f6443 | 3269 | save_line_number = line_number; |
b72432fd | 3270 | this_command_name = "(("; /* )) */ |
b80f6443 | 3271 | line_number = arith_command->line; |
cce855bc | 3272 | /* If we're in a function, update the line number information. */ |
7117c2d2 | 3273 | if (variable_context && interactive_shell) |
b80f6443 JA |
3274 | line_number -= function_line_number; |
3275 | ||
3276 | command_string_index = 0; | |
3277 | print_arith_command (arith_command->exp); | |
95732b49 JA |
3278 | |
3279 | if (signal_in_progress (DEBUG_TRAP) == 0) | |
3280 | { | |
3281 | FREE (the_printed_command_except_trap); | |
3282 | the_printed_command_except_trap = savestring (the_printed_command); | |
3283 | } | |
cce855bc | 3284 | |
7117c2d2 JA |
3285 | /* Run the debug trap before each arithmetic command, but do it after we |
3286 | update the line number information and before we expand the various | |
3287 | words in the expression. */ | |
b80f6443 JA |
3288 | retval = run_debug_trap (); |
3289 | #if defined (DEBUGGER) | |
3290 | /* In debugging mode, if the DEBUG trap returns a non-zero status, we | |
3291 | skip the command. */ | |
3292 | if (debugging_mode && retval != EXECUTION_SUCCESS) | |
3293 | { | |
3294 | line_number = save_line_number; | |
3295 | return (EXECUTION_SUCCESS); | |
3296 | } | |
3297 | #endif | |
7117c2d2 | 3298 | |
b80f6443 | 3299 | new = expand_words_no_vars (arith_command->exp); |
cce855bc JA |
3300 | |
3301 | /* If we're tracing, make a new word list with `((' at the front and `))' | |
3302 | at the back and print it. */ | |
3303 | if (echo_command_at_execute) | |
3304 | xtrace_print_arith_cmd (new); | |
3305 | ||
b80f6443 JA |
3306 | if (new) |
3307 | { | |
0628567a JA |
3308 | exp = new->next ? string_list (new) : new->word->word; |
3309 | expresult = evalexp (exp, &expok); | |
b80f6443 | 3310 | line_number = save_line_number; |
0628567a JA |
3311 | if (exp != new->word->word) |
3312 | free (exp); | |
b80f6443 JA |
3313 | dispose_words (new); |
3314 | } | |
3315 | else | |
3316 | { | |
3317 | expresult = 0; | |
3318 | expok = 1; | |
3319 | } | |
cce855bc JA |
3320 | |
3321 | if (expok == 0) | |
3322 | return (EXECUTION_FAILURE); | |
3323 | ||
f73dda09 | 3324 | return (expresult == 0 ? EXECUTION_FAILURE : EXECUTION_SUCCESS); |
cce855bc JA |
3325 | } |
3326 | #endif /* DPAREN_ARITHMETIC */ | |
3327 | ||
3328 | #if defined (COND_COMMAND) | |
3329 | ||
3185942a | 3330 | static char * const nullstr = ""; |
cce855bc JA |
3331 | |
3332 | static int | |
3333 | execute_cond_node (cond) | |
3334 | COND_COM *cond; | |
3335 | { | |
0001803f | 3336 | int result, invert, patmatch, rmatch, mflags, ignore; |
f73dda09 | 3337 | char *arg1, *arg2; |
cce855bc JA |
3338 | |
3339 | invert = (cond->flags & CMD_INVERT_RETURN); | |
0001803f CR |
3340 | ignore = (cond->flags & CMD_IGNORE_RETURN); |
3341 | if (ignore) | |
3342 | { | |
3343 | if (cond->left) | |
3344 | cond->left->flags |= CMD_IGNORE_RETURN; | |
3345 | if (cond->right) | |
3346 | cond->right->flags |= CMD_IGNORE_RETURN; | |
3347 | } | |
3348 | ||
cce855bc JA |
3349 | if (cond->type == COND_EXPR) |
3350 | result = execute_cond_node (cond->left); | |
3351 | else if (cond->type == COND_OR) | |
3352 | { | |
3353 | result = execute_cond_node (cond->left); | |
3354 | if (result != EXECUTION_SUCCESS) | |
3355 | result = execute_cond_node (cond->right); | |
3356 | } | |
3357 | else if (cond->type == COND_AND) | |
3358 | { | |
3359 | result = execute_cond_node (cond->left); | |
3360 | if (result == EXECUTION_SUCCESS) | |
3361 | result = execute_cond_node (cond->right); | |
3362 | } | |
3363 | else if (cond->type == COND_UNARY) | |
3364 | { | |
0001803f CR |
3365 | if (ignore) |
3366 | comsub_ignore_return++; | |
cce855bc | 3367 | arg1 = cond_expand_word (cond->left->op, 0); |
0001803f CR |
3368 | if (ignore) |
3369 | comsub_ignore_return--; | |
cce855bc JA |
3370 | if (arg1 == 0) |
3371 | arg1 = nullstr; | |
3372 | if (echo_command_at_execute) | |
3373 | xtrace_print_cond_term (cond->type, invert, cond->op, arg1, (char *)NULL); | |
3374 | result = unary_test (cond->op->word, arg1) ? EXECUTION_SUCCESS : EXECUTION_FAILURE; | |
3375 | if (arg1 != nullstr) | |
3376 | free (arg1); | |
3377 | } | |
3378 | else if (cond->type == COND_BINARY) | |
3379 | { | |
0628567a | 3380 | rmatch = 0; |
b72432fd JA |
3381 | patmatch = ((cond->op->word[1] == '=') && (cond->op->word[2] == '\0') && |
3382 | (cond->op->word[0] == '!' || cond->op->word[0] == '=') || | |
3383 | (cond->op->word[0] == '=' && cond->op->word[1] == '\0')); | |
b80f6443 JA |
3384 | #if defined (COND_REGEXP) |
3385 | rmatch = (cond->op->word[0] == '=' && cond->op->word[1] == '~' && | |
3386 | cond->op->word[2] == '\0'); | |
3387 | #endif | |
cce855bc | 3388 | |
0001803f CR |
3389 | if (ignore) |
3390 | comsub_ignore_return++; | |
cce855bc | 3391 | arg1 = cond_expand_word (cond->left->op, 0); |
0001803f CR |
3392 | if (ignore) |
3393 | comsub_ignore_return--; | |
cce855bc JA |
3394 | if (arg1 == 0) |
3395 | arg1 = nullstr; | |
0001803f CR |
3396 | if (ignore) |
3397 | comsub_ignore_return++; | |
f1be666c JA |
3398 | arg2 = cond_expand_word (cond->right->op, |
3399 | (rmatch && shell_compatibility_level > 31) ? 2 : (patmatch ? 1 : 0)); | |
0001803f CR |
3400 | if (ignore) |
3401 | comsub_ignore_return--; | |
cce855bc JA |
3402 | if (arg2 == 0) |
3403 | arg2 = nullstr; | |
3404 | ||
3405 | if (echo_command_at_execute) | |
3406 | xtrace_print_cond_term (cond->type, invert, cond->op, arg1, arg2); | |
3407 | ||
b80f6443 JA |
3408 | #if defined (COND_REGEXP) |
3409 | if (rmatch) | |
3410 | { | |
3411 | mflags = SHMAT_PWARN; | |
3412 | #if defined (ARRAY_VARS) | |
3413 | mflags |= SHMAT_SUBEXP; | |
3414 | #endif | |
3415 | ||
3416 | result = sh_regmatch (arg1, arg2, mflags); | |
3417 | } | |
3418 | else | |
3419 | #endif /* COND_REGEXP */ | |
95732b49 JA |
3420 | { |
3421 | int oe; | |
3422 | oe = extended_glob; | |
3423 | extended_glob = 1; | |
0001803f | 3424 | result = binary_test (cond->op->word, arg1, arg2, TEST_PATMATCH|TEST_ARITHEXP|TEST_LOCALE) |
95732b49 JA |
3425 | ? EXECUTION_SUCCESS |
3426 | : EXECUTION_FAILURE; | |
3427 | extended_glob = oe; | |
3428 | } | |
cce855bc JA |
3429 | if (arg1 != nullstr) |
3430 | free (arg1); | |
3431 | if (arg2 != nullstr) | |
3432 | free (arg2); | |
3433 | } | |
3434 | else | |
3435 | { | |
b72432fd | 3436 | command_error ("execute_cond_node", CMDERR_BADTYPE, cond->type, 0); |
cce855bc JA |
3437 | jump_to_top_level (DISCARD); |
3438 | result = EXECUTION_FAILURE; | |
3439 | } | |
3440 | ||
3441 | if (invert) | |
3442 | result = (result == EXECUTION_SUCCESS) ? EXECUTION_FAILURE : EXECUTION_SUCCESS; | |
3443 | ||
3444 | return result; | |
3445 | } | |
3446 | ||
3447 | static int | |
3448 | execute_cond_command (cond_command) | |
3449 | COND_COM *cond_command; | |
3450 | { | |
b80f6443 | 3451 | int retval, save_line_number; |
cce855bc | 3452 | |
b80f6443 JA |
3453 | retval = EXECUTION_SUCCESS; |
3454 | save_line_number = line_number; | |
cce855bc JA |
3455 | |
3456 | this_command_name = "[["; | |
b80f6443 | 3457 | line_number = cond_command->line; |
cce855bc | 3458 | /* If we're in a function, update the line number information. */ |
7117c2d2 | 3459 | if (variable_context && interactive_shell) |
b80f6443 | 3460 | line_number -= function_line_number; |
b80f6443 JA |
3461 | command_string_index = 0; |
3462 | print_cond_command (cond_command); | |
95732b49 JA |
3463 | |
3464 | if (signal_in_progress (DEBUG_TRAP) == 0) | |
3465 | { | |
3466 | FREE (the_printed_command_except_trap); | |
3467 | the_printed_command_except_trap = savestring (the_printed_command); | |
3468 | } | |
cce855bc | 3469 | |
7117c2d2 JA |
3470 | /* Run the debug trap before each conditional command, but do it after we |
3471 | update the line number information. */ | |
b80f6443 JA |
3472 | retval = run_debug_trap (); |
3473 | #if defined (DEBUGGER) | |
3474 | /* In debugging mode, if the DEBUG trap returns a non-zero status, we | |
3475 | skip the command. */ | |
3476 | if (debugging_mode && retval != EXECUTION_SUCCESS) | |
3477 | { | |
3478 | line_number = save_line_number; | |
3479 | return (EXECUTION_SUCCESS); | |
3480 | } | |
3481 | #endif | |
7117c2d2 | 3482 | |
cce855bc JA |
3483 | #if 0 |
3484 | debug_print_cond_command (cond_command); | |
3485 | #endif | |
b80f6443 JA |
3486 | |
3487 | last_command_exit_value = retval = execute_cond_node (cond_command); | |
3488 | line_number = save_line_number; | |
3489 | return (retval); | |
cce855bc JA |
3490 | } |
3491 | #endif /* COND_COMMAND */ | |
3492 | ||
726f6388 JA |
3493 | static void |
3494 | bind_lastarg (arg) | |
3495 | char *arg; | |
3496 | { | |
3497 | SHELL_VAR *var; | |
3498 | ||
ccc6cda3 | 3499 | if (arg == 0) |
726f6388 | 3500 | arg = ""; |
95732b49 | 3501 | var = bind_variable ("_", arg, 0); |
bb70624e | 3502 | VUNSETATTR (var, att_exported); |
726f6388 JA |
3503 | } |
3504 | ||
ccc6cda3 JA |
3505 | /* Execute a null command. Fork a subshell if the command uses pipes or is |
3506 | to be run asynchronously. This handles all the side effects that are | |
3507 | supposed to take place. */ | |
3508 | static int | |
95732b49 | 3509 | execute_null_command (redirects, pipe_in, pipe_out, async) |
ccc6cda3 | 3510 | REDIRECT *redirects; |
bb70624e | 3511 | int pipe_in, pipe_out, async; |
ccc6cda3 | 3512 | { |
b80f6443 | 3513 | int r; |
0001803f CR |
3514 | int forcefork; |
3515 | REDIRECT *rd; | |
b80f6443 | 3516 | |
0001803f CR |
3517 | for (forcefork = 0, rd = redirects; rd; rd = rd->next) |
3518 | forcefork += rd->rflags & REDIR_VARASSIGN; | |
3519 | ||
3520 | if (forcefork || pipe_in != NO_PIPE || pipe_out != NO_PIPE || async) | |
ccc6cda3 JA |
3521 | { |
3522 | /* We have a null command, but we really want a subshell to take | |
3523 | care of it. Just fork, do piping and redirections, and exit. */ | |
3524 | if (make_child ((char *)NULL, async) == 0) | |
3525 | { | |
3526 | /* Cancel traps, in trap.c. */ | |
3527 | restore_original_signals (); /* XXX */ | |
3528 | ||
3529 | do_piping (pipe_in, pipe_out); | |
3530 | ||
3185942a JA |
3531 | #if defined (COPROCESS_SUPPORT) |
3532 | coproc_closeall (); | |
3533 | #endif | |
3534 | ||
3535 | subshell_environment = 0; | |
0628567a JA |
3536 | if (async) |
3537 | subshell_environment |= SUBSHELL_ASYNC; | |
3538 | if (pipe_in != NO_PIPE || pipe_out != NO_PIPE) | |
3539 | subshell_environment |= SUBSHELL_PIPE; | |
ccc6cda3 | 3540 | |
b80f6443 | 3541 | if (do_redirections (redirects, RX_ACTIVE) == 0) |
ccc6cda3 JA |
3542 | exit (EXECUTION_SUCCESS); |
3543 | else | |
3544 | exit (EXECUTION_FAILURE); | |
3545 | } | |
3546 | else | |
3547 | { | |
3548 | close_pipes (pipe_in, pipe_out); | |
3549 | #if defined (PROCESS_SUBSTITUTION) && defined (HAVE_DEV_FD) | |
3550 | unlink_fifo_list (); | |
3551 | #endif | |
3552 | return (EXECUTION_SUCCESS); | |
3553 | } | |
3554 | } | |
3555 | else | |
3556 | { | |
3557 | /* Even if there aren't any command names, pretend to do the | |
3558 | redirections that are specified. The user expects the side | |
3559 | effects to take place. If the redirections fail, then return | |
3560 | failure. Otherwise, if a command substitution took place while | |
3561 | expanding the command or a redirection, return the value of that | |
3562 | substitution. Otherwise, return EXECUTION_SUCCESS. */ | |
3563 | ||
b80f6443 JA |
3564 | r = do_redirections (redirects, RX_ACTIVE|RX_UNDOABLE); |
3565 | cleanup_redirects (redirection_undo_list); | |
3566 | redirection_undo_list = (REDIRECT *)NULL; | |
3567 | ||
3568 | if (r != 0) | |
ccc6cda3 | 3569 | return (EXECUTION_FAILURE); |
95732b49 | 3570 | else if (last_command_subst_pid != NO_PID) |
ccc6cda3 JA |
3571 | return (last_command_exit_value); |
3572 | else | |
3573 | return (EXECUTION_SUCCESS); | |
3574 | } | |
3575 | } | |
3576 | ||
3577 | /* This is a hack to suppress word splitting for assignment statements | |
3578 | given as arguments to builtins with the ASSIGNMENT_BUILTIN flag set. */ | |
3579 | static void | |
3580 | fix_assignment_words (words) | |
3581 | WORD_LIST *words; | |
3582 | { | |
3583 | WORD_LIST *w; | |
3584 | struct builtin *b; | |
6d41b715 | 3585 | int assoc, global; |
ccc6cda3 JA |
3586 | |
3587 | if (words == 0) | |
3588 | return; | |
3589 | ||
7117c2d2 | 3590 | b = 0; |
6d41b715 | 3591 | assoc = global = 0; |
ccc6cda3 JA |
3592 | |
3593 | for (w = words; w; w = w->next) | |
3594 | if (w->word->flags & W_ASSIGNMENT) | |
7117c2d2 JA |
3595 | { |
3596 | if (b == 0) | |
3597 | { | |
3598 | b = builtin_address_internal (words->word->word, 0); | |
3599 | if (b == 0 || (b->flags & ASSIGNMENT_BUILTIN) == 0) | |
3600 | return; | |
95732b49 JA |
3601 | else if (b && (b->flags & ASSIGNMENT_BUILTIN)) |
3602 | words->word->flags |= W_ASSNBLTIN; | |
7117c2d2 | 3603 | } |
95732b49 | 3604 | w->word->flags |= (W_NOSPLIT|W_NOGLOB|W_TILDEEXP|W_ASSIGNARG); |
3185942a JA |
3605 | #if defined (ARRAY_VARS) |
3606 | if (assoc) | |
3607 | w->word->flags |= W_ASSIGNASSOC; | |
6d41b715 CR |
3608 | if (global) |
3609 | w->word->flags |= W_ASSNGLOBAL; | |
3185942a | 3610 | #endif |
7117c2d2 | 3611 | } |
3185942a JA |
3612 | #if defined (ARRAY_VARS) |
3613 | /* Note that we saw an associative array option to a builtin that takes | |
3614 | assignment statements. This is a bit of a kludge. */ | |
6d41b715 CR |
3615 | else if (w->word->word[0] == '-' && (strchr (w->word->word+1, 'A') || strchr (w->word->word+1, 'g'))) |
3616 | #else | |
3617 | else if (w->word->word[0] == '-' && strchr (w->word->word+1, 'g')) | |
3618 | #endif | |
3185942a JA |
3619 | { |
3620 | if (b == 0) | |
3621 | { | |
3622 | b = builtin_address_internal (words->word->word, 0); | |
3623 | if (b == 0 || (b->flags & ASSIGNMENT_BUILTIN) == 0) | |
3624 | return; | |
3625 | else if (b && (b->flags & ASSIGNMENT_BUILTIN)) | |
3626 | words->word->flags |= W_ASSNBLTIN; | |
3627 | } | |
6d41b715 | 3628 | if ((words->word->flags & W_ASSNBLTIN) && strchr (w->word->word+1, 'A')) |
3185942a | 3629 | assoc = 1; |
6d41b715 CR |
3630 | if ((words->word->flags & W_ASSNBLTIN) && strchr (w->word->word+1, 'g')) |
3631 | global = 1; | |
3185942a | 3632 | } |
3185942a JA |
3633 | } |
3634 | ||
3635 | /* Return 1 if the file found by searching $PATH for PATHNAME, defaulting | |
3636 | to PATHNAME, is a directory. Used by the autocd code below. */ | |
3637 | static int | |
3638 | is_dirname (pathname) | |
3639 | char *pathname; | |
3640 | { | |
3641 | char *temp; | |
3642 | temp = search_for_command (pathname); | |
3643 | return (temp ? file_isdir (temp) : file_isdir (pathname)); | |
ccc6cda3 JA |
3644 | } |
3645 | ||
726f6388 JA |
3646 | /* The meaty part of all the executions. We have to start hacking the |
3647 | real execution of commands here. Fork a process, set things up, | |
3648 | execute the command. */ | |
ccc6cda3 | 3649 | static int |
726f6388 JA |
3650 | execute_simple_command (simple_command, pipe_in, pipe_out, async, fds_to_close) |
3651 | SIMPLE_COM *simple_command; | |
3652 | int pipe_in, pipe_out, async; | |
3653 | struct fd_bitmap *fds_to_close; | |
3654 | { | |
3655 | WORD_LIST *words, *lastword; | |
ccc6cda3 | 3656 | char *command_line, *lastarg, *temp; |
bc4cd23c | 3657 | int first_word_quoted, result, builtin_is_special, already_forked, dofork; |
95732b49 | 3658 | pid_t old_last_async_pid; |
f73dda09 | 3659 | sh_builtin_func_t *builtin; |
ccc6cda3 | 3660 | SHELL_VAR *func; |
495aee44 | 3661 | volatile int old_builtin, old_command_builtin; |
726f6388 JA |
3662 | |
3663 | result = EXECUTION_SUCCESS; | |
ccc6cda3 | 3664 | special_builtin_failed = builtin_is_special = 0; |
cce855bc | 3665 | command_line = (char *)0; |
726f6388 | 3666 | |
ccc6cda3 | 3667 | /* If we're in a function, update the line number information. */ |
0001803f | 3668 | if (variable_context && interactive_shell && sourcelevel == 0) |
b80f6443 | 3669 | line_number -= function_line_number; |
7117c2d2 | 3670 | |
726f6388 JA |
3671 | /* Remember what this command line looks like at invocation. */ |
3672 | command_string_index = 0; | |
3673 | print_simple_command (simple_command); | |
726f6388 | 3674 | |
0628567a | 3675 | #if 0 |
95732b49 | 3676 | if (signal_in_progress (DEBUG_TRAP) == 0 && (this_command_name == 0 || (STREQ (this_command_name, "trap") == 0))) |
0628567a JA |
3677 | #else |
3678 | if (signal_in_progress (DEBUG_TRAP) == 0 && running_trap == 0) | |
3679 | #endif | |
b80f6443 JA |
3680 | { |
3681 | FREE (the_printed_command_except_trap); | |
95732b49 | 3682 | the_printed_command_except_trap = the_printed_command ? savestring (the_printed_command) : (char *)0; |
b80f6443 JA |
3683 | } |
3684 | ||
3685 | /* Run the debug trap before each simple command, but do it after we | |
3686 | update the line number information. */ | |
3687 | result = run_debug_trap (); | |
3688 | #if defined (DEBUGGER) | |
3689 | /* In debugging mode, if the DEBUG trap returns a non-zero status, we | |
3690 | skip the command. */ | |
3691 | if (debugging_mode && result != EXECUTION_SUCCESS) | |
3692 | return (EXECUTION_SUCCESS); | |
3693 | #endif | |
3694 | ||
726f6388 | 3695 | first_word_quoted = |
3185942a | 3696 | simple_command->words ? (simple_command->words->word->flags & W_QUOTED) : 0; |
726f6388 | 3697 | |
95732b49 | 3698 | last_command_subst_pid = NO_PID; |
b72432fd | 3699 | old_last_async_pid = last_asynchronous_pid; |
726f6388 | 3700 | |
bc4cd23c JA |
3701 | already_forked = dofork = 0; |
3702 | ||
3703 | /* If we're in a pipeline or run in the background, set DOFORK so we | |
3704 | make the child early, before word expansion. This keeps assignment | |
3705 | statements from affecting the parent shell's environment when they | |
3706 | should not. */ | |
3707 | dofork = pipe_in != NO_PIPE || pipe_out != NO_PIPE || async; | |
3708 | ||
3709 | /* Something like `%2 &' should restart job 2 in the background, not cause | |
3710 | the shell to fork here. */ | |
3711 | if (dofork && pipe_in == NO_PIPE && pipe_out == NO_PIPE && | |
3712 | simple_command->words && simple_command->words->word && | |
3713 | simple_command->words->word->word && | |
3714 | (simple_command->words->word->word[0] == '%')) | |
3715 | dofork = 0; | |
3716 | ||
3717 | if (dofork) | |
cce855bc | 3718 | { |
bb70624e JA |
3719 | /* Do this now, because execute_disk_command will do it anyway in the |
3720 | vast majority of cases. */ | |
3721 | maybe_make_export_env (); | |
3722 | ||
95732b49 JA |
3723 | /* Don't let a DEBUG trap overwrite the command string to be saved with |
3724 | the process/job associated with this child. */ | |
3725 | if (make_child (savestring (the_printed_command_except_trap), async) == 0) | |
cce855bc JA |
3726 | { |
3727 | already_forked = 1; | |
3728 | simple_command->flags |= CMD_NO_FORK; | |
3729 | ||
95732b49 JA |
3730 | subshell_environment = SUBSHELL_FORK; |
3731 | if (pipe_in != NO_PIPE || pipe_out != NO_PIPE) | |
3732 | subshell_environment |= SUBSHELL_PIPE; | |
3733 | if (async) | |
3734 | subshell_environment |= SUBSHELL_ASYNC; | |
28ef6c31 | 3735 | |
bb70624e JA |
3736 | /* We need to do this before piping to handle some really |
3737 | pathological cases where one of the pipe file descriptors | |
3738 | is < 2. */ | |
3739 | if (fds_to_close) | |
3740 | close_fd_bitmap (fds_to_close); | |
3741 | ||
cce855bc | 3742 | do_piping (pipe_in, pipe_out); |
f73dda09 | 3743 | pipe_in = pipe_out = NO_PIPE; |
3185942a JA |
3744 | #if defined (COPROCESS_SUPPORT) |
3745 | coproc_closeall (); | |
3746 | #endif | |
cce855bc | 3747 | |
b72432fd | 3748 | last_asynchronous_pid = old_last_async_pid; |
cce855bc JA |
3749 | } |
3750 | else | |
3751 | { | |
495aee44 CR |
3752 | /* Don't let simple commands that aren't the last command in a |
3753 | pipeline change $? for the rest of the pipeline (or at all). */ | |
3754 | if (pipe_out != NO_PIPE) | |
3755 | result = last_command_exit_value; | |
cce855bc JA |
3756 | close_pipes (pipe_in, pipe_out); |
3757 | #if defined (PROCESS_SUBSTITUTION) && defined (HAVE_DEV_FD) | |
3758 | unlink_fifo_list (); | |
3759 | #endif | |
3760 | command_line = (char *)NULL; /* don't free this. */ | |
3761 | bind_lastarg ((char *)NULL); | |
3762 | return (result); | |
3763 | } | |
3764 | } | |
3765 | ||
726f6388 JA |
3766 | /* If we are re-running this as the result of executing the `command' |
3767 | builtin, do not expand the command words a second time. */ | |
3768 | if ((simple_command->flags & CMD_INHIBIT_EXPANSION) == 0) | |
3769 | { | |
3770 | current_fds_to_close = fds_to_close; | |
ccc6cda3 | 3771 | fix_assignment_words (simple_command->words); |
3185942a JA |
3772 | /* Pass the ignore return flag down to command substitutions */ |
3773 | if (simple_command->flags & CMD_IGNORE_RETURN) /* XXX */ | |
3774 | comsub_ignore_return++; | |
726f6388 | 3775 | words = expand_words (simple_command->words); |
3185942a JA |
3776 | if (simple_command->flags & CMD_IGNORE_RETURN) |
3777 | comsub_ignore_return--; | |
726f6388 JA |
3778 | current_fds_to_close = (struct fd_bitmap *)NULL; |
3779 | } | |
3780 | else | |
3781 | words = copy_word_list (simple_command->words); | |
3782 | ||
726f6388 JA |
3783 | /* It is possible for WORDS not to have anything left in it. |
3784 | Perhaps all the words consisted of `$foo', and there was | |
3785 | no variable `$foo'. */ | |
ccc6cda3 | 3786 | if (words == 0) |
726f6388 | 3787 | { |
b80f6443 | 3788 | this_command_name = 0; |
ccc6cda3 | 3789 | result = execute_null_command (simple_command->redirects, |
cce855bc | 3790 | pipe_in, pipe_out, |
95732b49 | 3791 | already_forked ? 0 : async); |
cce855bc JA |
3792 | if (already_forked) |
3793 | exit (result); | |
3794 | else | |
3795 | { | |
3796 | bind_lastarg ((char *)NULL); | |
3797 | set_pipestatus_from_exit (result); | |
3798 | return (result); | |
3799 | } | |
ccc6cda3 | 3800 | } |
726f6388 | 3801 | |
ccc6cda3 | 3802 | lastarg = (char *)NULL; |
726f6388 | 3803 | |
ccc6cda3 | 3804 | begin_unwind_frame ("simple-command"); |
726f6388 | 3805 | |
ccc6cda3 | 3806 | if (echo_command_at_execute) |
b80f6443 | 3807 | xtrace_print_word_list (words, 1); |
726f6388 | 3808 | |
f73dda09 | 3809 | builtin = (sh_builtin_func_t *)NULL; |
ccc6cda3 JA |
3810 | func = (SHELL_VAR *)NULL; |
3811 | if ((simple_command->flags & CMD_NO_FUNCTIONS) == 0) | |
3812 | { | |
3813 | /* Posix.2 says special builtins are found before functions. We | |
3814 | don't set builtin_is_special anywhere other than here, because | |
3815 | this path is followed only when the `command' builtin is *not* | |
3816 | being used, and we don't want to exit the shell if a special | |
3817 | builtin executed with `command builtin' fails. `command' is not | |
3818 | a special builtin. */ | |
3819 | if (posixly_correct) | |
3820 | { | |
3821 | builtin = find_special_builtin (words->word->word); | |
3822 | if (builtin) | |
3823 | builtin_is_special = 1; | |
726f6388 | 3824 | } |
ccc6cda3 | 3825 | if (builtin == 0) |
726f6388 | 3826 | func = find_function (words->word->word); |
ccc6cda3 | 3827 | } |
726f6388 | 3828 | |
b80f6443 JA |
3829 | /* In POSIX mode, assignment errors in the temporary environment cause a |
3830 | non-interactive shell to exit. */ | |
3831 | if (builtin_is_special && interactive_shell == 0 && tempenv_assign_error) | |
3832 | { | |
3833 | last_command_exit_value = EXECUTION_FAILURE; | |
3834 | jump_to_top_level (ERREXIT); | |
3835 | } | |
3836 | ||
ccc6cda3 JA |
3837 | add_unwind_protect (dispose_words, words); |
3838 | QUIT; | |
726f6388 | 3839 | |
ccc6cda3 JA |
3840 | /* Bind the last word in this command to "$_" after execution. */ |
3841 | for (lastword = words; lastword->next; lastword = lastword->next) | |
3842 | ; | |
3843 | lastarg = lastword->word->word; | |
726f6388 JA |
3844 | |
3845 | #if defined (JOB_CONTROL) | |
ccc6cda3 | 3846 | /* Is this command a job control related thing? */ |
cce855bc | 3847 | if (words->word->word[0] == '%' && already_forked == 0) |
ccc6cda3 JA |
3848 | { |
3849 | this_command_name = async ? "bg" : "fg"; | |
726f6388 | 3850 | last_shell_builtin = this_shell_builtin; |
ccc6cda3 JA |
3851 | this_shell_builtin = builtin_address (this_command_name); |
3852 | result = (*this_shell_builtin) (words); | |
3853 | goto return_result; | |
3854 | } | |
726f6388 | 3855 | |
ccc6cda3 JA |
3856 | /* One other possiblilty. The user may want to resume an existing job. |
3857 | If they do, find out whether this word is a candidate for a running | |
3858 | job. */ | |
cce855bc | 3859 | if (job_control && already_forked == 0 && async == 0 && |
ccc6cda3 JA |
3860 | !first_word_quoted && |
3861 | !words->next && | |
3862 | words->word->word[0] && | |
3863 | !simple_command->redirects && | |
3864 | pipe_in == NO_PIPE && | |
3865 | pipe_out == NO_PIPE && | |
3866 | (temp = get_string_value ("auto_resume"))) | |
3867 | { | |
7117c2d2 | 3868 | int job, jflags, started_status; |
ccc6cda3 | 3869 | |
7117c2d2 JA |
3870 | jflags = JM_STOPPED|JM_FIRSTMATCH; |
3871 | if (STREQ (temp, "exact")) | |
3872 | jflags |= JM_EXACT; | |
3873 | else if (STREQ (temp, "substring")) | |
3874 | jflags |= JM_SUBSTRING; | |
3875 | else | |
3876 | jflags |= JM_PREFIX; | |
3877 | job = get_job_by_name (words->word->word, jflags); | |
3878 | if (job != NO_JOB) | |
726f6388 | 3879 | { |
7117c2d2 JA |
3880 | run_unwind_frame ("simple-command"); |
3881 | this_command_name = "fg"; | |
3882 | last_shell_builtin = this_shell_builtin; | |
3883 | this_shell_builtin = builtin_address ("fg"); | |
ccc6cda3 | 3884 | |
7117c2d2 JA |
3885 | started_status = start_job (job, 1); |
3886 | return ((started_status < 0) ? EXECUTION_FAILURE : started_status); | |
726f6388 | 3887 | } |
ccc6cda3 JA |
3888 | } |
3889 | #endif /* JOB_CONTROL */ | |
726f6388 | 3890 | |
3185942a | 3891 | run_builtin: |
ccc6cda3 JA |
3892 | /* Remember the name of this command globally. */ |
3893 | this_command_name = words->word->word; | |
726f6388 | 3894 | |
ccc6cda3 JA |
3895 | QUIT; |
3896 | ||
3897 | /* This command could be a shell builtin or a user-defined function. | |
3898 | We have already found special builtins by this time, so we do not | |
3899 | set builtin_is_special. If this is a function or builtin, and we | |
3900 | have pipes, then fork a subshell in here. Otherwise, just execute | |
3901 | the command directly. */ | |
3902 | if (func == 0 && builtin == 0) | |
3903 | builtin = find_shell_builtin (this_command_name); | |
3904 | ||
3905 | last_shell_builtin = this_shell_builtin; | |
3906 | this_shell_builtin = builtin; | |
3907 | ||
3908 | if (builtin || func) | |
726f6388 | 3909 | { |
3185942a | 3910 | if (builtin) |
495aee44 CR |
3911 | { |
3912 | old_builtin = executing_builtin; | |
3913 | old_command_builtin = executing_command_builtin; | |
3914 | unwind_protect_int (executing_builtin); /* modified in execute_builtin */ | |
3915 | unwind_protect_int (executing_command_builtin); /* ditto */ | |
3916 | } | |
28ef6c31 | 3917 | if (already_forked) |
726f6388 | 3918 | { |
cce855bc | 3919 | /* reset_terminating_signals (); */ /* XXX */ |
495aee44 CR |
3920 | /* Reset the signal handlers in the child, but don't free the |
3921 | trap strings. Set a flag noting that we have to free the | |
3922 | trap strings if we run trap to change a signal disposition. */ | |
3923 | reset_signal_handlers (); | |
3924 | subshell_environment |= SUBSHELL_RESETTRAP; | |
726f6388 | 3925 | |
cce855bc | 3926 | if (async) |
ccc6cda3 | 3927 | { |
cce855bc JA |
3928 | if ((simple_command->flags & CMD_STDIN_REDIR) && |
3929 | pipe_in == NO_PIPE && | |
3930 | (stdin_redirects (simple_command->redirects) == 0)) | |
3931 | async_redirect_stdin (); | |
3932 | setup_async_signals (); | |
ccc6cda3 | 3933 | } |
cce855bc | 3934 | |
b80f6443 | 3935 | subshell_level++; |
cce855bc JA |
3936 | execute_subshell_builtin_or_function |
3937 | (words, simple_command->redirects, builtin, func, | |
3938 | pipe_in, pipe_out, async, fds_to_close, | |
3939 | simple_command->flags); | |
b80f6443 | 3940 | subshell_level--; |
726f6388 JA |
3941 | } |
3942 | else | |
3943 | { | |
ccc6cda3 JA |
3944 | result = execute_builtin_or_function |
3945 | (words, builtin, func, simple_command->redirects, fds_to_close, | |
3946 | simple_command->flags); | |
3947 | if (builtin) | |
3948 | { | |
3949 | if (result > EX_SHERRBASE) | |
3950 | { | |
cce855bc JA |
3951 | result = builtin_status (result); |
3952 | if (builtin_is_special) | |
3953 | special_builtin_failed = 1; | |
ccc6cda3 JA |
3954 | } |
3955 | /* In POSIX mode, if there are assignment statements preceding | |
3956 | a special builtin, they persist after the builtin | |
3957 | completes. */ | |
3958 | if (posixly_correct && builtin_is_special && temporary_env) | |
3959 | merge_temporary_env (); | |
3960 | } | |
3961 | else /* function */ | |
3962 | { | |
3963 | if (result == EX_USAGE) | |
3964 | result = EX_BADUSAGE; | |
3965 | else if (result > EX_SHERRBASE) | |
cce855bc | 3966 | result = EXECUTION_FAILURE; |
ccc6cda3 JA |
3967 | } |
3968 | ||
cce855bc JA |
3969 | set_pipestatus_from_exit (result); |
3970 | ||
726f6388 JA |
3971 | goto return_result; |
3972 | } | |
3973 | } | |
726f6388 | 3974 | |
3185942a JA |
3975 | if (autocd && interactive && words->word && is_dirname (words->word->word)) |
3976 | { | |
3977 | words = make_word_list (make_word ("cd"), words); | |
3978 | xtrace_print_word_list (words, 0); | |
3979 | goto run_builtin; | |
3980 | } | |
3981 | ||
cce855bc | 3982 | if (command_line == 0) |
0628567a | 3983 | command_line = savestring (the_printed_command_except_trap); |
cce855bc | 3984 | |
f1be666c JA |
3985 | #if defined (PROCESS_SUBSTITUTION) |
3986 | if ((subshell_environment & SUBSHELL_COMSUB) && (simple_command->flags & CMD_NO_FORK) && fifos_pending() > 0) | |
3987 | simple_command->flags &= ~CMD_NO_FORK; | |
3988 | #endif | |
3989 | ||
495aee44 | 3990 | result = execute_disk_command (words, simple_command->redirects, command_line, |
ccc6cda3 | 3991 | pipe_in, pipe_out, async, fds_to_close, |
d166f048 | 3992 | simple_command->flags); |
726f6388 JA |
3993 | |
3994 | return_result: | |
3995 | bind_lastarg (lastarg); | |
ccc6cda3 | 3996 | FREE (command_line); |
b80f6443 | 3997 | dispose_words (words); |
495aee44 CR |
3998 | if (builtin) |
3999 | { | |
4000 | executing_builtin = old_builtin; | |
4001 | executing_command_builtin = old_command_builtin; | |
4002 | } | |
b80f6443 JA |
4003 | discard_unwind_frame ("simple-command"); |
4004 | this_command_name = (char *)NULL; /* points to freed memory now */ | |
726f6388 JA |
4005 | return (result); |
4006 | } | |
4007 | ||
ccc6cda3 JA |
4008 | /* Translate the special builtin exit statuses. We don't really need a |
4009 | function for this; it's a placeholder for future work. */ | |
4010 | static int | |
4011 | builtin_status (result) | |
4012 | int result; | |
4013 | { | |
4014 | int r; | |
4015 | ||
4016 | switch (result) | |
4017 | { | |
4018 | case EX_USAGE: | |
4019 | r = EX_BADUSAGE; | |
4020 | break; | |
4021 | case EX_REDIRFAIL: | |
4022 | case EX_BADSYNTAX: | |
4023 | case EX_BADASSIGN: | |
4024 | case EX_EXPFAIL: | |
4025 | r = EXECUTION_FAILURE; | |
4026 | break; | |
4027 | default: | |
4028 | r = EXECUTION_SUCCESS; | |
4029 | break; | |
4030 | } | |
4031 | return (r); | |
4032 | } | |
4033 | ||
726f6388 JA |
4034 | static int |
4035 | execute_builtin (builtin, words, flags, subshell) | |
f73dda09 | 4036 | sh_builtin_func_t *builtin; |
726f6388 JA |
4037 | WORD_LIST *words; |
4038 | int flags, subshell; | |
4039 | { | |
d166f048 | 4040 | int old_e_flag, result, eval_unwind; |
7117c2d2 | 4041 | int isbltinenv; |
0001803f | 4042 | char *error_trap; |
726f6388 | 4043 | |
3185942a JA |
4044 | #if 0 |
4045 | /* XXX -- added 12/11 */ | |
4046 | terminate_immediately++; | |
4047 | #endif | |
4048 | ||
0001803f | 4049 | error_trap = 0; |
ccc6cda3 | 4050 | old_e_flag = exit_immediately_on_error; |
726f6388 JA |
4051 | /* The eval builtin calls parse_and_execute, which does not know about |
4052 | the setting of flags, and always calls the execution functions with | |
4053 | flags that will exit the shell on an error if -e is set. If the | |
4054 | eval builtin is being called, and we're supposed to ignore the exit | |
0001803f CR |
4055 | value of the command, we turn the -e flag off ourselves and disable |
4056 | the ERR trap, then restore them when the command completes. This is | |
4057 | also a problem (as below) for the command and source/. builtins. */ | |
3185942a JA |
4058 | if (subshell == 0 && (flags & CMD_IGNORE_RETURN) && |
4059 | (builtin == eval_builtin || builtin == command_builtin || builtin == source_builtin)) | |
726f6388 JA |
4060 | { |
4061 | begin_unwind_frame ("eval_builtin"); | |
4062 | unwind_protect_int (exit_immediately_on_error); | |
0001803f CR |
4063 | error_trap = TRAP_STRING (ERROR_TRAP); |
4064 | if (error_trap) | |
4065 | { | |
4066 | error_trap = savestring (error_trap); | |
4067 | add_unwind_protect (xfree, error_trap); | |
4068 | add_unwind_protect (set_error_trap, error_trap); | |
4069 | restore_default_signal (ERROR_TRAP); | |
4070 | } | |
726f6388 | 4071 | exit_immediately_on_error = 0; |
d166f048 | 4072 | eval_unwind = 1; |
726f6388 | 4073 | } |
d166f048 JA |
4074 | else |
4075 | eval_unwind = 0; | |
726f6388 JA |
4076 | |
4077 | /* The temporary environment for a builtin is supposed to apply to | |
4078 | all commands executed by that builtin. Currently, this is a | |
95732b49 JA |
4079 | problem only with the `unset', `source' and `eval' builtins. */ |
4080 | ||
4081 | isbltinenv = (builtin == source_builtin || builtin == eval_builtin || builtin == unset_builtin); | |
4082 | ||
7117c2d2 | 4083 | if (isbltinenv) |
726f6388 JA |
4084 | { |
4085 | if (subshell == 0) | |
4086 | begin_unwind_frame ("builtin_env"); | |
4087 | ||
4088 | if (temporary_env) | |
4089 | { | |
7117c2d2 | 4090 | push_scope (VC_BLTNENV, temporary_env); |
726f6388 | 4091 | if (subshell == 0) |
95732b49 | 4092 | add_unwind_protect (pop_scope, (flags & CMD_COMMAND_BUILTIN) ? 0 : "1"); |
7117c2d2 | 4093 | temporary_env = (HASH_TABLE *)NULL; |
726f6388 | 4094 | } |
28ef6c31 JA |
4095 | } |
4096 | ||
4097 | /* `return' does a longjmp() back to a saved environment in execute_function. | |
4098 | If a variable assignment list preceded the command, and the shell is | |
4099 | running in POSIX mode, we need to merge that into the shell_variables | |
4100 | table, since `return' is a POSIX special builtin. */ | |
4101 | if (posixly_correct && subshell == 0 && builtin == return_builtin && temporary_env) | |
4102 | { | |
4103 | begin_unwind_frame ("return_temp_env"); | |
4104 | add_unwind_protect (merge_temporary_env, (char *)NULL); | |
726f6388 JA |
4105 | } |
4106 | ||
3185942a | 4107 | executing_builtin++; |
495aee44 | 4108 | executing_command_builtin |= builtin == command_builtin; |
726f6388 JA |
4109 | result = ((*builtin) (words->next)); |
4110 | ||
28ef6c31 JA |
4111 | /* This shouldn't happen, but in case `return' comes back instead of |
4112 | longjmp'ing, we need to unwind. */ | |
4113 | if (posixly_correct && subshell == 0 && builtin == return_builtin && temporary_env) | |
4114 | discard_unwind_frame ("return_temp_env"); | |
4115 | ||
7117c2d2 JA |
4116 | if (subshell == 0 && isbltinenv) |
4117 | run_unwind_frame ("builtin_env"); | |
726f6388 | 4118 | |
d166f048 | 4119 | if (eval_unwind) |
726f6388 JA |
4120 | { |
4121 | exit_immediately_on_error += old_e_flag; | |
0001803f CR |
4122 | if (error_trap) |
4123 | { | |
4124 | set_error_trap (error_trap); | |
4125 | xfree (error_trap); | |
4126 | } | |
726f6388 JA |
4127 | discard_unwind_frame ("eval_builtin"); |
4128 | } | |
4129 | ||
3185942a JA |
4130 | #if 0 |
4131 | /* XXX -- added 12/11 */ | |
4132 | terminate_immediately--; | |
4133 | #endif | |
4134 | ||
726f6388 JA |
4135 | return (result); |
4136 | } | |
4137 | ||
726f6388 JA |
4138 | static int |
4139 | execute_function (var, words, flags, fds_to_close, async, subshell) | |
4140 | SHELL_VAR *var; | |
4141 | WORD_LIST *words; | |
f73dda09 | 4142 | int flags; |
726f6388 | 4143 | struct fd_bitmap *fds_to_close; |
f73dda09 | 4144 | int async, subshell; |
726f6388 JA |
4145 | { |
4146 | int return_val, result; | |
b80f6443 JA |
4147 | COMMAND *tc, *fc, *save_current; |
4148 | char *debug_trap, *error_trap, *return_trap; | |
4149 | #if defined (ARRAY_VARS) | |
95732b49 | 4150 | SHELL_VAR *funcname_v, *nfv, *bash_source_v, *bash_lineno_v; |
495aee44 CR |
4151 | ARRAY *funcname_a; |
4152 | volatile ARRAY *bash_source_a; | |
4153 | volatile ARRAY *bash_lineno_a; | |
b80f6443 JA |
4154 | #endif |
4155 | FUNCTION_DEF *shell_fn; | |
4156 | char *sfile, *t; | |
f73dda09 JA |
4157 | |
4158 | USE_VAR(fc); | |
726f6388 | 4159 | |
0001803f CR |
4160 | if (funcnest_max > 0 && funcnest >= funcnest_max) |
4161 | { | |
4162 | internal_error ("%s: maximum function nesting level exceeded (%d)", var->name, funcnest); | |
495aee44 | 4163 | funcnest = 0; /* XXX - should we reset it somewhere else? */ |
0001803f CR |
4164 | jump_to_top_level (DISCARD); |
4165 | } | |
0001803f | 4166 | |
b80f6443 JA |
4167 | #if defined (ARRAY_VARS) |
4168 | GET_ARRAY_FROM_VAR ("FUNCNAME", funcname_v, funcname_a); | |
4169 | GET_ARRAY_FROM_VAR ("BASH_SOURCE", bash_source_v, bash_source_a); | |
4170 | GET_ARRAY_FROM_VAR ("BASH_LINENO", bash_lineno_v, bash_lineno_a); | |
4171 | #endif | |
4172 | ||
726f6388 JA |
4173 | tc = (COMMAND *)copy_command (function_cell (var)); |
4174 | if (tc && (flags & CMD_IGNORE_RETURN)) | |
4175 | tc->flags |= CMD_IGNORE_RETURN; | |
4176 | ||
726f6388 JA |
4177 | if (subshell == 0) |
4178 | { | |
ccc6cda3 | 4179 | begin_unwind_frame ("function_calling"); |
7117c2d2 | 4180 | push_context (var->name, subshell, temporary_env); |
726f6388 JA |
4181 | add_unwind_protect (pop_context, (char *)NULL); |
4182 | unwind_protect_int (line_number); | |
ccc6cda3 JA |
4183 | unwind_protect_int (return_catch_flag); |
4184 | unwind_protect_jmp_buf (return_catch); | |
4185 | add_unwind_protect (dispose_command, (char *)tc); | |
bb70624e | 4186 | unwind_protect_pointer (this_shell_function); |
ccc6cda3 | 4187 | unwind_protect_int (loop_level); |
0001803f | 4188 | unwind_protect_int (funcnest); |
726f6388 | 4189 | } |
7117c2d2 JA |
4190 | else |
4191 | push_context (var->name, subshell, temporary_env); /* don't unwind-protect for subshells */ | |
4192 | ||
4193 | temporary_env = (HASH_TABLE *)NULL; | |
726f6388 | 4194 | |
bb70624e JA |
4195 | this_shell_function = var; |
4196 | make_funcname_visible (1); | |
4197 | ||
f73dda09 JA |
4198 | debug_trap = TRAP_STRING(DEBUG_TRAP); |
4199 | error_trap = TRAP_STRING(ERROR_TRAP); | |
b80f6443 | 4200 | return_trap = TRAP_STRING(RETURN_TRAP); |
f73dda09 | 4201 | |
b80f6443 JA |
4202 | /* The order of the unwind protects for debug_trap, error_trap and |
4203 | return_trap is important here! unwind-protect commands are run | |
4204 | in reverse order of registration. If this causes problems, take | |
4205 | out the xfree unwind-protect calls and live with the small memory leak. */ | |
4206 | ||
4207 | /* function_trace_mode != 0 means that all functions inherit the DEBUG trap. | |
4208 | if the function has the trace attribute set, it inherits the DEBUG trap */ | |
4209 | if (debug_trap && ((trace_p (var) == 0) && function_trace_mode == 0)) | |
ccc6cda3 JA |
4210 | { |
4211 | if (subshell == 0) | |
4212 | { | |
4213 | debug_trap = savestring (debug_trap); | |
cce855bc | 4214 | add_unwind_protect (xfree, debug_trap); |
ccc6cda3 JA |
4215 | add_unwind_protect (set_debug_trap, debug_trap); |
4216 | } | |
4217 | restore_default_signal (DEBUG_TRAP); | |
4218 | } | |
726f6388 | 4219 | |
b80f6443 JA |
4220 | /* error_trace_mode != 0 means that functions inherit the ERR trap. */ |
4221 | if (error_trap && error_trace_mode == 0) | |
f73dda09 JA |
4222 | { |
4223 | if (subshell == 0) | |
4224 | { | |
4225 | error_trap = savestring (error_trap); | |
4226 | add_unwind_protect (xfree, error_trap); | |
4227 | add_unwind_protect (set_error_trap, error_trap); | |
4228 | } | |
4229 | restore_default_signal (ERROR_TRAP); | |
4230 | } | |
4231 | ||
95732b49 JA |
4232 | /* Shell functions inherit the RETURN trap if function tracing is on |
4233 | globally or on individually for this function. */ | |
4234 | #if 0 | |
b80f6443 | 4235 | if (return_trap && ((trace_p (var) == 0) && function_trace_mode == 0)) |
95732b49 JA |
4236 | #else |
4237 | if (return_trap && (signal_in_progress (DEBUG_TRAP) || ((trace_p (var) == 0) && function_trace_mode == 0))) | |
4238 | #endif | |
b80f6443 JA |
4239 | { |
4240 | if (subshell == 0) | |
4241 | { | |
4242 | return_trap = savestring (return_trap); | |
4243 | add_unwind_protect (xfree, return_trap); | |
4244 | add_unwind_protect (set_return_trap, return_trap); | |
4245 | } | |
4246 | restore_default_signal (RETURN_TRAP); | |
4247 | } | |
4248 | ||
4249 | funcnest++; | |
4250 | #if defined (ARRAY_VARS) | |
4251 | /* This is quite similar to the code in shell.c and elsewhere. */ | |
4252 | shell_fn = find_function_def (this_shell_function->name); | |
4253 | sfile = shell_fn ? shell_fn->source_file : ""; | |
4254 | array_push (funcname_a, this_shell_function->name); | |
4255 | ||
4256 | array_push (bash_source_a, sfile); | |
4257 | t = itos (executing_line_number ()); | |
4258 | array_push (bash_lineno_a, t); | |
4259 | free (t); | |
4260 | #endif | |
4261 | ||
726f6388 JA |
4262 | /* The temporary environment for a function is supposed to apply to |
4263 | all commands executed within the function body. */ | |
726f6388 | 4264 | |
726f6388 JA |
4265 | remember_args (words->next, 1); |
4266 | ||
b80f6443 JA |
4267 | /* Update BASH_ARGV and BASH_ARGC */ |
4268 | if (debugging_mode) | |
4269 | push_args (words->next); | |
4270 | ||
ccc6cda3 | 4271 | /* Number of the line on which the function body starts. */ |
b80f6443 | 4272 | line_number = function_line_number = tc->line; |
726f6388 | 4273 | |
726f6388 | 4274 | #if defined (JOB_CONTROL) |
95732b49 JA |
4275 | if (subshell) |
4276 | stop_pipeline (async, (COMMAND *)NULL); | |
726f6388 | 4277 | #endif |
726f6388 | 4278 | |
95732b49 | 4279 | fc = tc; |
726f6388 JA |
4280 | |
4281 | return_catch_flag++; | |
4282 | return_val = setjmp (return_catch); | |
4283 | ||
4284 | if (return_val) | |
95732b49 JA |
4285 | { |
4286 | result = return_catch_value; | |
4287 | /* Run the RETURN trap in the function's context. */ | |
4288 | save_current = currently_executing_command; | |
4289 | run_return_trap (); | |
4290 | currently_executing_command = save_current; | |
4291 | } | |
726f6388 | 4292 | else |
b80f6443 JA |
4293 | { |
4294 | /* Run the debug trap here so we can trap at the start of a function's | |
4295 | execution rather than the execution of the body's first command. */ | |
4296 | showing_function_line = 1; | |
4297 | save_current = currently_executing_command; | |
4298 | result = run_debug_trap (); | |
4299 | #if defined (DEBUGGER) | |
4300 | /* In debugging mode, if the DEBUG trap returns a non-zero status, we | |
4301 | skip the command. */ | |
4302 | if (debugging_mode == 0 || result == EXECUTION_SUCCESS) | |
4303 | { | |
4304 | showing_function_line = 0; | |
4305 | currently_executing_command = save_current; | |
4306 | result = execute_command_internal (fc, 0, NO_PIPE, NO_PIPE, fds_to_close); | |
4307 | ||
4308 | /* Run the RETURN trap in the function's context */ | |
4309 | save_current = currently_executing_command; | |
4310 | run_return_trap (); | |
4311 | currently_executing_command = save_current; | |
4312 | } | |
4313 | #else | |
4314 | result = execute_command_internal (fc, 0, NO_PIPE, NO_PIPE, fds_to_close); | |
95732b49 JA |
4315 | |
4316 | save_current = currently_executing_command; | |
4317 | run_return_trap (); | |
4318 | currently_executing_command = save_current; | |
b80f6443 JA |
4319 | #endif |
4320 | showing_function_line = 0; | |
4321 | } | |
4322 | ||
4323 | /* Restore BASH_ARGC and BASH_ARGV */ | |
4324 | if (debugging_mode) | |
4325 | pop_args (); | |
726f6388 | 4326 | |
ccc6cda3 | 4327 | if (subshell == 0) |
726f6388 JA |
4328 | run_unwind_frame ("function_calling"); |
4329 | ||
b80f6443 | 4330 | #if defined (ARRAY_VARS) |
95732b49 JA |
4331 | /* These two variables cannot be unset, and cannot be affected by the |
4332 | function. */ | |
b80f6443 | 4333 | array_pop (bash_source_a); |
b80f6443 | 4334 | array_pop (bash_lineno_a); |
95732b49 JA |
4335 | |
4336 | /* FUNCNAME can be unset, and so can potentially be changed by the | |
4337 | function. */ | |
4338 | GET_ARRAY_FROM_VAR ("FUNCNAME", nfv, funcname_a); | |
4339 | if (nfv == funcname_v) | |
4340 | array_pop (funcname_a); | |
b80f6443 JA |
4341 | #endif |
4342 | ||
bb70624e | 4343 | if (variable_context == 0 || this_shell_function == 0) |
0001803f CR |
4344 | { |
4345 | make_funcname_visible (0); | |
4346 | #if defined (PROCESS_SUBSTITUTION) | |
4347 | unlink_fifo_list (); | |
4348 | #endif | |
4349 | } | |
4350 | ||
726f6388 JA |
4351 | return (result); |
4352 | } | |
4353 | ||
bb70624e JA |
4354 | /* A convenience routine for use by other parts of the shell to execute |
4355 | a particular shell function. */ | |
4356 | int | |
4357 | execute_shell_function (var, words) | |
4358 | SHELL_VAR *var; | |
4359 | WORD_LIST *words; | |
4360 | { | |
4361 | int ret; | |
4362 | struct fd_bitmap *bitmap; | |
4363 | ||
4364 | bitmap = new_fd_bitmap (FD_BITMAP_DEFAULT_SIZE); | |
4365 | begin_unwind_frame ("execute-shell-function"); | |
4366 | add_unwind_protect (dispose_fd_bitmap, (char *)bitmap); | |
4367 | ||
4368 | ret = execute_function (var, words, 0, bitmap, 0, 0); | |
4369 | ||
4370 | dispose_fd_bitmap (bitmap); | |
4371 | discard_unwind_frame ("execute-shell-function"); | |
4372 | ||
4373 | return ret; | |
4374 | } | |
4375 | ||
726f6388 JA |
4376 | /* Execute a shell builtin or function in a subshell environment. This |
4377 | routine does not return; it only calls exit(). If BUILTIN is non-null, | |
4378 | it points to a function to call to execute a shell builtin; otherwise | |
4379 | VAR points at the body of a function to execute. WORDS is the arguments | |
4380 | to the command, REDIRECTS specifies redirections to perform before the | |
4381 | command is executed. */ | |
4382 | static void | |
4383 | execute_subshell_builtin_or_function (words, redirects, builtin, var, | |
4384 | pipe_in, pipe_out, async, fds_to_close, | |
4385 | flags) | |
4386 | WORD_LIST *words; | |
4387 | REDIRECT *redirects; | |
f73dda09 | 4388 | sh_builtin_func_t *builtin; |
726f6388 JA |
4389 | SHELL_VAR *var; |
4390 | int pipe_in, pipe_out, async; | |
4391 | struct fd_bitmap *fds_to_close; | |
4392 | int flags; | |
4393 | { | |
0628567a | 4394 | int result, r, funcvalue; |
bb70624e JA |
4395 | #if defined (JOB_CONTROL) |
4396 | int jobs_hack; | |
726f6388 | 4397 | |
b72432fd JA |
4398 | jobs_hack = (builtin == jobs_builtin) && |
4399 | ((subshell_environment & SUBSHELL_ASYNC) == 0 || pipe_out != NO_PIPE); | |
bb70624e JA |
4400 | #endif |
4401 | ||
4402 | /* A subshell is neither a login shell nor interactive. */ | |
4403 | login_shell = interactive = 0; | |
b72432fd | 4404 | |
0628567a JA |
4405 | if (async) |
4406 | subshell_environment |= SUBSHELL_ASYNC; | |
4407 | if (pipe_in != NO_PIPE || pipe_out != NO_PIPE) | |
4408 | subshell_environment |= SUBSHELL_PIPE; | |
726f6388 | 4409 | |
ccc6cda3 | 4410 | maybe_make_export_env (); /* XXX - is this needed? */ |
726f6388 JA |
4411 | |
4412 | #if defined (JOB_CONTROL) | |
4413 | /* Eradicate all traces of job control after we fork the subshell, so | |
4414 | all jobs begun by this subshell are in the same process group as | |
4415 | the shell itself. */ | |
4416 | ||
4417 | /* Allow the output of `jobs' to be piped. */ | |
b72432fd | 4418 | if (jobs_hack) |
726f6388 JA |
4419 | kill_current_pipeline (); |
4420 | else | |
4421 | without_job_control (); | |
4422 | ||
4423 | set_sigchld_handler (); | |
4424 | #endif /* JOB_CONTROL */ | |
4425 | ||
4426 | set_sigint_handler (); | |
4427 | ||
726f6388 JA |
4428 | if (fds_to_close) |
4429 | close_fd_bitmap (fds_to_close); | |
4430 | ||
bb70624e JA |
4431 | do_piping (pipe_in, pipe_out); |
4432 | ||
b80f6443 | 4433 | if (do_redirections (redirects, RX_ACTIVE) != 0) |
726f6388 JA |
4434 | exit (EXECUTION_FAILURE); |
4435 | ||
4436 | if (builtin) | |
4437 | { | |
726f6388 JA |
4438 | /* Give builtins a place to jump back to on failure, |
4439 | so we don't go back up to main(). */ | |
4440 | result = setjmp (top_level); | |
4441 | ||
0628567a JA |
4442 | /* Give the return builtin a place to jump to when executed in a subshell |
4443 | or pipeline */ | |
4444 | funcvalue = 0; | |
4445 | if (return_catch_flag && builtin == return_builtin) | |
4446 | funcvalue = setjmp (return_catch); | |
4447 | ||
726f6388 JA |
4448 | if (result == EXITPROG) |
4449 | exit (last_command_exit_value); | |
4450 | else if (result) | |
4451 | exit (EXECUTION_FAILURE); | |
0628567a JA |
4452 | else if (funcvalue) |
4453 | exit (return_catch_value); | |
726f6388 | 4454 | else |
cce855bc JA |
4455 | { |
4456 | r = execute_builtin (builtin, words, flags, 1); | |
3185942a | 4457 | fflush (stdout); |
cce855bc JA |
4458 | if (r == EX_USAGE) |
4459 | r = EX_BADUSAGE; | |
4460 | exit (r); | |
4461 | } | |
726f6388 JA |
4462 | } |
4463 | else | |
3185942a JA |
4464 | { |
4465 | r = execute_function (var, words, flags, fds_to_close, async, 1); | |
4466 | fflush (stdout); | |
4467 | exit (r); | |
4468 | } | |
726f6388 JA |
4469 | } |
4470 | ||
4471 | /* Execute a builtin or function in the current shell context. If BUILTIN | |
4472 | is non-null, it is the builtin command to execute, otherwise VAR points | |
4473 | to the body of a function. WORDS are the command's arguments, REDIRECTS | |
4474 | are the redirections to perform. FDS_TO_CLOSE is the usual bitmap of | |
4475 | file descriptors to close. | |
4476 | ||
4477 | If BUILTIN is exec_builtin, the redirections specified in REDIRECTS are | |
4478 | not undone before this function returns. */ | |
4479 | static int | |
4480 | execute_builtin_or_function (words, builtin, var, redirects, | |
4481 | fds_to_close, flags) | |
4482 | WORD_LIST *words; | |
f73dda09 | 4483 | sh_builtin_func_t *builtin; |
726f6388 JA |
4484 | SHELL_VAR *var; |
4485 | REDIRECT *redirects; | |
4486 | struct fd_bitmap *fds_to_close; | |
4487 | int flags; | |
4488 | { | |
ccc6cda3 | 4489 | int result; |
726f6388 | 4490 | REDIRECT *saved_undo_list; |
495aee44 CR |
4491 | #if defined (PROCESS_SUBSTITUTION) |
4492 | int ofifo, nfifo, osize; | |
4493 | char *ofifo_list; | |
4494 | #endif | |
4495 | ||
4496 | ||
4497 | #if defined (PROCESS_SUBSTITUTION) | |
4498 | ofifo = num_fifos (); | |
4499 | ofifo_list = copy_fifo_list (&osize); | |
4500 | #endif | |
726f6388 | 4501 | |
b80f6443 | 4502 | if (do_redirections (redirects, RX_ACTIVE|RX_UNDOABLE) != 0) |
726f6388 JA |
4503 | { |
4504 | cleanup_redirects (redirection_undo_list); | |
4505 | redirection_undo_list = (REDIRECT *)NULL; | |
4506 | dispose_exec_redirects (); | |
495aee44 CR |
4507 | #if defined (PROCESS_SUBSTITUTION) |
4508 | free (ofifo_list); | |
4509 | #endif | |
ccc6cda3 | 4510 | return (EX_REDIRFAIL); /* was EXECUTION_FAILURE */ |
726f6388 JA |
4511 | } |
4512 | ||
4513 | saved_undo_list = redirection_undo_list; | |
4514 | ||
4515 | /* Calling the "exec" builtin changes redirections forever. */ | |
4516 | if (builtin == exec_builtin) | |
4517 | { | |
4518 | dispose_redirects (saved_undo_list); | |
4519 | saved_undo_list = exec_redirection_undo_list; | |
4520 | exec_redirection_undo_list = (REDIRECT *)NULL; | |
4521 | } | |
4522 | else | |
4523 | dispose_exec_redirects (); | |
4524 | ||
4525 | if (saved_undo_list) | |
4526 | { | |
4527 | begin_unwind_frame ("saved redirects"); | |
ccc6cda3 | 4528 | add_unwind_protect (cleanup_redirects, (char *)saved_undo_list); |
726f6388 JA |
4529 | } |
4530 | ||
4531 | redirection_undo_list = (REDIRECT *)NULL; | |
4532 | ||
4533 | if (builtin) | |
4534 | result = execute_builtin (builtin, words, flags, 0); | |
4535 | else | |
4536 | result = execute_function (var, words, flags, fds_to_close, 0, 0); | |
4537 | ||
b80f6443 | 4538 | /* We do this before undoing the effects of any redirections. */ |
3185942a JA |
4539 | fflush (stdout); |
4540 | fpurge (stdout); | |
b80f6443 JA |
4541 | if (ferror (stdout)) |
4542 | clearerr (stdout); | |
4543 | ||
28ef6c31 JA |
4544 | /* If we are executing the `command' builtin, but this_shell_builtin is |
4545 | set to `exec_builtin', we know that we have something like | |
4546 | `command exec [redirection]', since otherwise `exec' would have | |
4547 | overwritten the shell and we wouldn't get here. In this case, we | |
4548 | want to behave as if the `command' builtin had not been specified | |
4549 | and preserve the redirections. */ | |
4550 | if (builtin == command_builtin && this_shell_builtin == exec_builtin) | |
4551 | { | |
495aee44 CR |
4552 | int discard; |
4553 | ||
4554 | discard = 0; | |
28ef6c31 | 4555 | if (saved_undo_list) |
495aee44 CR |
4556 | { |
4557 | dispose_redirects (saved_undo_list); | |
4558 | discard = 1; | |
4559 | } | |
28ef6c31 JA |
4560 | redirection_undo_list = exec_redirection_undo_list; |
4561 | saved_undo_list = exec_redirection_undo_list = (REDIRECT *)NULL; | |
495aee44 CR |
4562 | if (discard) |
4563 | discard_unwind_frame ("saved redirects"); | |
28ef6c31 JA |
4564 | } |
4565 | ||
726f6388 JA |
4566 | if (saved_undo_list) |
4567 | { | |
4568 | redirection_undo_list = saved_undo_list; | |
4569 | discard_unwind_frame ("saved redirects"); | |
4570 | } | |
4571 | ||
4572 | if (redirection_undo_list) | |
4573 | { | |
ccc6cda3 | 4574 | cleanup_redirects (redirection_undo_list); |
726f6388 JA |
4575 | redirection_undo_list = (REDIRECT *)NULL; |
4576 | } | |
4577 | ||
495aee44 CR |
4578 | #if defined (PROCESS_SUBSTITUTION) |
4579 | /* Close any FIFOs created by this builtin or function. */ | |
4580 | nfifo = num_fifos (); | |
4581 | if (nfifo > ofifo) | |
4582 | close_new_fifos (ofifo_list, osize); | |
4583 | free (ofifo_list); | |
4584 | #endif | |
4585 | ||
726f6388 JA |
4586 | return (result); |
4587 | } | |
4588 | ||
4589 | void | |
4590 | setup_async_signals () | |
4591 | { | |
b72432fd JA |
4592 | #if defined (__BEOS__) |
4593 | set_signal_handler (SIGHUP, SIG_IGN); /* they want csh-like behavior */ | |
4594 | #endif | |
4595 | ||
726f6388 JA |
4596 | #if defined (JOB_CONTROL) |
4597 | if (job_control == 0) | |
4598 | #endif | |
4599 | { | |
4600 | set_signal_handler (SIGINT, SIG_IGN); | |
4601 | set_signal_ignored (SIGINT); | |
4602 | set_signal_handler (SIGQUIT, SIG_IGN); | |
4603 | set_signal_ignored (SIGQUIT); | |
4604 | } | |
4605 | } | |
4606 | ||
4607 | /* Execute a simple command that is hopefully defined in a disk file | |
4608 | somewhere. | |
4609 | ||
4610 | 1) fork () | |
4611 | 2) connect pipes | |
4612 | 3) look up the command | |
4613 | 4) do redirections | |
4614 | 5) execve () | |
4615 | 6) If the execve failed, see if the file has executable mode set. | |
4616 | If so, and it isn't a directory, then execute its contents as | |
4617 | a shell script. | |
4618 | ||
4619 | Note that the filename hashing stuff has to take place up here, | |
4620 | in the parent. This is probably why the Bourne style shells | |
4621 | don't handle it, since that would require them to go through | |
b80f6443 JA |
4622 | this gnarly hair, for no good reason. |
4623 | ||
4624 | NOTE: callers expect this to fork or exit(). */ | |
3185942a JA |
4625 | |
4626 | /* Name of a shell function to call when a command name is not found. */ | |
4627 | #ifndef NOTFOUND_HOOK | |
4628 | # define NOTFOUND_HOOK "command_not_found_handle" | |
4629 | #endif | |
4630 | ||
495aee44 | 4631 | static int |
726f6388 | 4632 | execute_disk_command (words, redirects, command_line, pipe_in, pipe_out, |
d166f048 | 4633 | async, fds_to_close, cmdflags) |
726f6388 JA |
4634 | WORD_LIST *words; |
4635 | REDIRECT *redirects; | |
4636 | char *command_line; | |
4637 | int pipe_in, pipe_out, async; | |
4638 | struct fd_bitmap *fds_to_close; | |
d166f048 | 4639 | int cmdflags; |
726f6388 | 4640 | { |
ccc6cda3 | 4641 | char *pathname, *command, **args; |
495aee44 | 4642 | int nofork, result; |
bb70624e | 4643 | pid_t pid; |
3185942a JA |
4644 | SHELL_VAR *hookf; |
4645 | WORD_LIST *wl; | |
726f6388 | 4646 | |
d166f048 | 4647 | nofork = (cmdflags & CMD_NO_FORK); /* Don't fork, just exec, if no pipes */ |
726f6388 | 4648 | pathname = words->word->word; |
ccc6cda3 | 4649 | |
495aee44 | 4650 | result = EXECUTION_SUCCESS; |
726f6388 | 4651 | #if defined (RESTRICTED_SHELL) |
b80f6443 | 4652 | command = (char *)NULL; |
0001803f | 4653 | if (restricted && mbschr (pathname, '/')) |
726f6388 | 4654 | { |
b80f6443 | 4655 | internal_error (_("%s: restricted: cannot specify `/' in command names"), |
726f6388 | 4656 | pathname); |
495aee44 | 4657 | result = last_command_exit_value = EXECUTION_FAILURE; |
b80f6443 JA |
4658 | |
4659 | /* If we're not going to fork below, we must already be in a child | |
4660 | process or a context in which it's safe to call exit(2). */ | |
4661 | if (nofork && pipe_in == NO_PIPE && pipe_out == NO_PIPE) | |
4662 | exit (last_command_exit_value); | |
4663 | else | |
4664 | goto parent_return; | |
726f6388 JA |
4665 | } |
4666 | #endif /* RESTRICTED_SHELL */ | |
4667 | ||
ccc6cda3 | 4668 | command = search_for_command (pathname); |
726f6388 | 4669 | |
ccc6cda3 | 4670 | if (command) |
726f6388 | 4671 | { |
ccc6cda3 JA |
4672 | maybe_make_export_env (); |
4673 | put_command_name_into_env (command); | |
726f6388 JA |
4674 | } |
4675 | ||
bb70624e | 4676 | /* We have to make the child before we check for the non-existence |
726f6388 JA |
4677 | of COMMAND, since we want the error messages to be redirected. */ |
4678 | /* If we can get away without forking and there are no pipes to deal with, | |
4679 | don't bother to fork, just directly exec the command. */ | |
4680 | if (nofork && pipe_in == NO_PIPE && pipe_out == NO_PIPE) | |
4681 | pid = 0; | |
4682 | else | |
4683 | pid = make_child (savestring (command_line), async); | |
4684 | ||
4685 | if (pid == 0) | |
4686 | { | |
4687 | int old_interactive; | |
4688 | ||
d166f048 JA |
4689 | #if 0 |
4690 | /* This has been disabled for the time being. */ | |
ccc6cda3 JA |
4691 | #if !defined (ARG_MAX) || ARG_MAX >= 10240 |
4692 | if (posixly_correct == 0) | |
f73dda09 | 4693 | put_gnu_argv_flags_into_env ((long)getpid (), glob_argv_flags); |
d166f048 | 4694 | #endif |
ccc6cda3 JA |
4695 | #endif |
4696 | ||
495aee44 | 4697 | reset_terminating_signals (); /* XXX */ |
726f6388 JA |
4698 | /* Cancel traps, in trap.c. */ |
4699 | restore_original_signals (); | |
4700 | ||
4701 | /* restore_original_signals may have undone the work done | |
cce855bc JA |
4702 | by make_child to ensure that SIGINT and SIGQUIT are ignored |
4703 | in asynchronous children. */ | |
726f6388 | 4704 | if (async) |
d166f048 JA |
4705 | { |
4706 | if ((cmdflags & CMD_STDIN_REDIR) && | |
4707 | pipe_in == NO_PIPE && | |
4708 | (stdin_redirects (redirects) == 0)) | |
4709 | async_redirect_stdin (); | |
4710 | setup_async_signals (); | |
4711 | } | |
726f6388 | 4712 | |
bb70624e JA |
4713 | /* This functionality is now provided by close-on-exec of the |
4714 | file descriptors manipulated by redirection and piping. | |
4715 | Some file descriptors still need to be closed in all children | |
4716 | because of the way bash does pipes; fds_to_close is a | |
4717 | bitmap of all such file descriptors. */ | |
4718 | if (fds_to_close) | |
4719 | close_fd_bitmap (fds_to_close); | |
4720 | ||
726f6388 JA |
4721 | do_piping (pipe_in, pipe_out); |
4722 | ||
f73dda09 | 4723 | old_interactive = interactive; |
726f6388 | 4724 | if (async) |
f73dda09 | 4725 | interactive = 0; |
726f6388 | 4726 | |
ccc6cda3 | 4727 | subshell_environment = SUBSHELL_FORK; |
726f6388 | 4728 | |
b80f6443 | 4729 | if (redirects && (do_redirections (redirects, RX_ACTIVE) != 0)) |
726f6388 JA |
4730 | { |
4731 | #if defined (PROCESS_SUBSTITUTION) | |
4732 | /* Try to remove named pipes that may have been created as the | |
4733 | result of redirections. */ | |
4734 | unlink_fifo_list (); | |
4735 | #endif /* PROCESS_SUBSTITUTION */ | |
4736 | exit (EXECUTION_FAILURE); | |
4737 | } | |
4738 | ||
4739 | if (async) | |
4740 | interactive = old_interactive; | |
4741 | ||
ccc6cda3 | 4742 | if (command == 0) |
726f6388 | 4743 | { |
3185942a JA |
4744 | hookf = find_function (NOTFOUND_HOOK); |
4745 | if (hookf == 0) | |
4746 | { | |
495aee44 CR |
4747 | /* Make sure filenames are displayed using printable characters */ |
4748 | if (ansic_shouldquote (pathname)) | |
4749 | pathname = ansic_quote (pathname, 0, NULL); | |
3185942a JA |
4750 | internal_error (_("%s: command not found"), pathname); |
4751 | exit (EX_NOTFOUND); /* Posix.2 says the exit status is 127 */ | |
4752 | } | |
4753 | ||
4754 | wl = make_word_list (make_word (NOTFOUND_HOOK), words); | |
4755 | exit (execute_shell_function (hookf, wl)); | |
726f6388 JA |
4756 | } |
4757 | ||
ccc6cda3 JA |
4758 | /* Execve expects the command name to be in args[0]. So we |
4759 | leave it there, in the same format that the user used to | |
4760 | type it in. */ | |
7117c2d2 | 4761 | args = strvec_from_word_list (words, 0, 0, (int *)NULL); |
726f6388 JA |
4762 | exit (shell_execve (command, args, export_env)); |
4763 | } | |
4764 | else | |
4765 | { | |
b80f6443 | 4766 | parent_return: |
726f6388 JA |
4767 | /* Make sure that the pipes are closed in the parent. */ |
4768 | close_pipes (pipe_in, pipe_out); | |
4769 | #if defined (PROCESS_SUBSTITUTION) && defined (HAVE_DEV_FD) | |
0001803f CR |
4770 | if (variable_context == 0) |
4771 | unlink_fifo_list (); | |
726f6388 JA |
4772 | #endif |
4773 | FREE (command); | |
495aee44 | 4774 | return (result); |
726f6388 JA |
4775 | } |
4776 | } | |
4777 | ||
28ef6c31 JA |
4778 | /* CPP defines to decide whether a particular index into the #! line |
4779 | corresponds to a valid interpreter name or argument character, or | |
4780 | whitespace. The MSDOS define is to allow \r to be treated the same | |
4781 | as \n. */ | |
4782 | ||
4783 | #if !defined (MSDOS) | |
4784 | # define STRINGCHAR(ind) \ | |
f73dda09 | 4785 | (ind < sample_len && !whitespace (sample[ind]) && sample[ind] != '\n') |
28ef6c31 | 4786 | # define WHITECHAR(ind) \ |
f73dda09 | 4787 | (ind < sample_len && whitespace (sample[ind])) |
28ef6c31 JA |
4788 | #else /* MSDOS */ |
4789 | # define STRINGCHAR(ind) \ | |
f73dda09 | 4790 | (ind < sample_len && !whitespace (sample[ind]) && sample[ind] != '\n' && sample[ind] != '\r') |
28ef6c31 | 4791 | # define WHITECHAR(ind) \ |
f73dda09 | 4792 | (ind < sample_len && whitespace (sample[ind])) |
28ef6c31 JA |
4793 | #endif /* MSDOS */ |
4794 | ||
f73dda09 JA |
4795 | static char * |
4796 | getinterp (sample, sample_len, endp) | |
4797 | char *sample; | |
4798 | int sample_len, *endp; | |
726f6388 JA |
4799 | { |
4800 | register int i; | |
f73dda09 JA |
4801 | char *execname; |
4802 | int start; | |
726f6388 JA |
4803 | |
4804 | /* Find the name of the interpreter to exec. */ | |
f73dda09 | 4805 | for (i = 2; i < sample_len && whitespace (sample[i]); i++) |
726f6388 JA |
4806 | ; |
4807 | ||
28ef6c31 | 4808 | for (start = i; STRINGCHAR(i); i++) |
726f6388 JA |
4809 | ; |
4810 | ||
f73dda09 JA |
4811 | execname = substring (sample, start, i); |
4812 | ||
4813 | if (endp) | |
4814 | *endp = i; | |
4815 | return execname; | |
4816 | } | |
4817 | ||
4818 | #if !defined (HAVE_HASH_BANG_EXEC) | |
4819 | /* If the operating system on which we're running does not handle | |
4820 | the #! executable format, then help out. SAMPLE is the text read | |
4821 | from the file, SAMPLE_LEN characters. COMMAND is the name of | |
4822 | the script; it and ARGS, the arguments given by the user, will | |
4823 | become arguments to the specified interpreter. ENV is the environment | |
4824 | to pass to the interpreter. | |
4825 | ||
4826 | The word immediately following the #! is the interpreter to execute. | |
4827 | A single argument to the interpreter is allowed. */ | |
4828 | ||
4829 | static int | |
4830 | execute_shell_script (sample, sample_len, command, args, env) | |
4831 | char *sample; | |
4832 | int sample_len; | |
4833 | char *command; | |
4834 | char **args, **env; | |
4835 | { | |
4836 | char *execname, *firstarg; | |
4837 | int i, start, size_increment, larry; | |
4838 | ||
4839 | /* Find the name of the interpreter to exec. */ | |
4840 | execname = getinterp (sample, sample_len, &i); | |
726f6388 JA |
4841 | size_increment = 1; |
4842 | ||
4843 | /* Now the argument, if any. */ | |
28ef6c31 | 4844 | for (firstarg = (char *)NULL, start = i; WHITECHAR(i); i++) |
726f6388 JA |
4845 | ; |
4846 | ||
4847 | /* If there is more text on the line, then it is an argument for the | |
4848 | interpreter. */ | |
28ef6c31 JA |
4849 | |
4850 | if (STRINGCHAR(i)) | |
726f6388 | 4851 | { |
28ef6c31 | 4852 | for (start = i; STRINGCHAR(i); i++) |
726f6388 | 4853 | ; |
bb70624e | 4854 | firstarg = substring ((char *)sample, start, i); |
726f6388 JA |
4855 | size_increment = 2; |
4856 | } | |
4857 | ||
7117c2d2 JA |
4858 | larry = strvec_len (args) + size_increment; |
4859 | args = strvec_resize (args, larry + 1); | |
726f6388 JA |
4860 | |
4861 | for (i = larry - 1; i; i--) | |
4862 | args[i] = args[i - size_increment]; | |
4863 | ||
4864 | args[0] = execname; | |
4865 | if (firstarg) | |
4866 | { | |
4867 | args[1] = firstarg; | |
4868 | args[2] = command; | |
4869 | } | |
4870 | else | |
4871 | args[1] = command; | |
4872 | ||
4873 | args[larry] = (char *)NULL; | |
4874 | ||
4875 | return (shell_execve (execname, args, env)); | |
4876 | } | |
28ef6c31 JA |
4877 | #undef STRINGCHAR |
4878 | #undef WHITECHAR | |
4879 | ||
ccc6cda3 JA |
4880 | #endif /* !HAVE_HASH_BANG_EXEC */ |
4881 | ||
d166f048 JA |
4882 | static void |
4883 | initialize_subshell () | |
4884 | { | |
4885 | #if defined (ALIAS) | |
4886 | /* Forget about any aliases that we knew of. We are in a subshell. */ | |
4887 | delete_all_aliases (); | |
4888 | #endif /* ALIAS */ | |
4889 | ||
4890 | #if defined (HISTORY) | |
4891 | /* Forget about the history lines we have read. This is a non-interactive | |
4892 | subshell. */ | |
4893 | history_lines_this_session = 0; | |
4894 | #endif | |
4895 | ||
4896 | #if defined (JOB_CONTROL) | |
4897 | /* Forget about the way job control was working. We are in a subshell. */ | |
4898 | without_job_control (); | |
4899 | set_sigchld_handler (); | |
95732b49 | 4900 | init_job_stats (); |
d166f048 JA |
4901 | #endif /* JOB_CONTROL */ |
4902 | ||
4903 | /* Reset the values of the shell flags and options. */ | |
4904 | reset_shell_flags (); | |
4905 | reset_shell_options (); | |
4906 | reset_shopt_options (); | |
4907 | ||
28ef6c31 JA |
4908 | /* Zero out builtin_env, since this could be a shell script run from a |
4909 | sourced file with a temporary environment supplied to the `source/.' | |
4910 | builtin. Such variables are not supposed to be exported (empirical | |
7117c2d2 JA |
4911 | testing with sh and ksh). Just throw it away; don't worry about a |
4912 | memory leak. */ | |
4913 | if (vc_isbltnenv (shell_variables)) | |
4914 | shell_variables = shell_variables->down; | |
28ef6c31 JA |
4915 | |
4916 | clear_unwind_protect_list (0); | |
f1be666c JA |
4917 | /* XXX -- are there other things we should be resetting here? */ |
4918 | parse_and_execute_level = 0; /* nothing left to restore it */ | |
28ef6c31 JA |
4919 | |
4920 | /* We're no longer inside a shell function. */ | |
0001803f | 4921 | variable_context = return_catch_flag = funcnest = 0; |
28ef6c31 | 4922 | |
3185942a JA |
4923 | executing_list = 0; /* XXX */ |
4924 | ||
d166f048 JA |
4925 | /* If we're not interactive, close the file descriptor from which we're |
4926 | reading the current shell script. */ | |
cce855bc | 4927 | if (interactive_shell == 0) |
b80f6443 | 4928 | unset_bash_input (0); |
d166f048 JA |
4929 | } |
4930 | ||
ccc6cda3 JA |
4931 | #if defined (HAVE_SETOSTYPE) && defined (_POSIX_SOURCE) |
4932 | # define SETOSTYPE(x) __setostype(x) | |
4933 | #else | |
4934 | # define SETOSTYPE(x) | |
4935 | #endif | |
726f6388 | 4936 | |
28ef6c31 JA |
4937 | #define READ_SAMPLE_BUF(file, buf, len) \ |
4938 | do \ | |
4939 | { \ | |
4940 | fd = open(file, O_RDONLY); \ | |
4941 | if (fd >= 0) \ | |
4942 | { \ | |
f73dda09 | 4943 | len = read (fd, buf, 80); \ |
28ef6c31 JA |
4944 | close (fd); \ |
4945 | } \ | |
4946 | else \ | |
4947 | len = -1; \ | |
4948 | } \ | |
4949 | while (0) | |
4950 | ||
726f6388 JA |
4951 | /* Call execve (), handling interpreting shell scripts, and handling |
4952 | exec failures. */ | |
4953 | int | |
4954 | shell_execve (command, args, env) | |
4955 | char *command; | |
4956 | char **args, **env; | |
4957 | { | |
ccc6cda3 | 4958 | int larray, i, fd; |
f73dda09 | 4959 | char sample[80]; |
28ef6c31 | 4960 | int sample_len; |
ccc6cda3 JA |
4961 | |
4962 | SETOSTYPE (0); /* Some systems use for USG/POSIX semantics */ | |
726f6388 | 4963 | execve (command, args, env); |
28ef6c31 | 4964 | i = errno; /* error from execve() */ |
3185942a | 4965 | CHECK_TERMSIG; |
ccc6cda3 | 4966 | SETOSTYPE (1); |
726f6388 JA |
4967 | |
4968 | /* If we get to this point, then start checking out the file. | |
4969 | Maybe it is something we can hack ourselves. */ | |
28ef6c31 | 4970 | if (i != ENOEXEC) |
ccc6cda3 | 4971 | { |
3185942a | 4972 | if (file_isdir (command)) |
495aee44 CR |
4973 | #if defined (EISDIR) |
4974 | internal_error (_("%s: %s"), command, strerror (EISDIR)); | |
4975 | #else | |
b80f6443 | 4976 | internal_error (_("%s: is a directory"), command); |
495aee44 | 4977 | #endif |
7117c2d2 JA |
4978 | else if (executable_file (command) == 0) |
4979 | { | |
4980 | errno = i; | |
4981 | file_error (command); | |
4982 | } | |
95732b49 JA |
4983 | /* errors not involving the path argument to execve. */ |
4984 | else if (i == E2BIG || i == ENOMEM) | |
4985 | { | |
4986 | errno = i; | |
4987 | file_error (command); | |
4988 | } | |
ccc6cda3 JA |
4989 | else |
4990 | { | |
7117c2d2 JA |
4991 | /* The file has the execute bits set, but the kernel refuses to |
4992 | run it for some reason. See why. */ | |
28ef6c31 JA |
4993 | #if defined (HAVE_HASH_BANG_EXEC) |
4994 | READ_SAMPLE_BUF (command, sample, sample_len); | |
4995 | if (sample_len > 2 && sample[0] == '#' && sample[1] == '!') | |
4996 | { | |
f73dda09 | 4997 | char *interp; |
95732b49 | 4998 | int ilen; |
f73dda09 JA |
4999 | |
5000 | interp = getinterp (sample, sample_len, (int *)NULL); | |
95732b49 | 5001 | ilen = strlen (interp); |
28ef6c31 | 5002 | errno = i; |
95732b49 JA |
5003 | if (interp[ilen - 1] == '\r') |
5004 | { | |
5005 | interp = xrealloc (interp, ilen + 2); | |
5006 | interp[ilen - 1] = '^'; | |
5007 | interp[ilen] = 'M'; | |
5008 | interp[ilen + 1] = '\0'; | |
5009 | } | |
b80f6443 | 5010 | sys_error (_("%s: %s: bad interpreter"), command, interp ? interp : ""); |
f73dda09 | 5011 | FREE (interp); |
28ef6c31 JA |
5012 | return (EX_NOEXEC); |
5013 | } | |
5014 | #endif | |
ccc6cda3 | 5015 | errno = i; |
726f6388 | 5016 | file_error (command); |
ccc6cda3 | 5017 | } |
d166f048 | 5018 | return ((i == ENOENT) ? EX_NOTFOUND : EX_NOEXEC); /* XXX Posix.2 says that exit status is 126 */ |
ccc6cda3 | 5019 | } |
726f6388 | 5020 | |
ccc6cda3 JA |
5021 | /* This file is executable. |
5022 | If it begins with #!, then help out people with losing operating | |
5023 | systems. Otherwise, check to see if it is a binary file by seeing | |
28ef6c31 JA |
5024 | if the contents of the first line (or up to 80 characters) are in the |
5025 | ASCII set. If it's a text file, execute the contents as shell commands, | |
5026 | otherwise return 126 (EX_BINARY_FILE). */ | |
5027 | READ_SAMPLE_BUF (command, sample, sample_len); | |
ccc6cda3 | 5028 | |
28ef6c31 JA |
5029 | if (sample_len == 0) |
5030 | return (EXECUTION_SUCCESS); | |
ccc6cda3 | 5031 | |
28ef6c31 JA |
5032 | /* Is this supposed to be an executable script? |
5033 | If so, the format of the line is "#! interpreter [argument]". | |
5034 | A single argument is allowed. The BSD kernel restricts | |
5035 | the length of the entire line to 32 characters (32 bytes | |
5036 | being the size of the BSD exec header), but we allow 80 | |
5037 | characters. */ | |
5038 | if (sample_len > 0) | |
5039 | { | |
ccc6cda3 | 5040 | #if !defined (HAVE_HASH_BANG_EXEC) |
28ef6c31 JA |
5041 | if (sample_len > 2 && sample[0] == '#' && sample[1] == '!') |
5042 | return (execute_shell_script (sample, sample_len, command, args, env)); | |
5043 | else | |
ccc6cda3 | 5044 | #endif |
28ef6c31 JA |
5045 | if (check_binary_file (sample, sample_len)) |
5046 | { | |
b80f6443 | 5047 | internal_error (_("%s: cannot execute binary file"), command); |
28ef6c31 | 5048 | return (EX_BINARY_FILE); |
726f6388 | 5049 | } |
ccc6cda3 JA |
5050 | } |
5051 | ||
28ef6c31 JA |
5052 | /* We have committed to attempting to execute the contents of this file |
5053 | as shell commands. */ | |
5054 | ||
d166f048 | 5055 | initialize_subshell (); |
726f6388 | 5056 | |
ccc6cda3 | 5057 | set_sigint_handler (); |
726f6388 | 5058 | |
ccc6cda3 | 5059 | /* Insert the name of this shell into the argument list. */ |
7117c2d2 JA |
5060 | larray = strvec_len (args) + 1; |
5061 | args = strvec_resize (args, larray + 1); | |
726f6388 | 5062 | |
ccc6cda3 JA |
5063 | for (i = larray - 1; i; i--) |
5064 | args[i] = args[i - 1]; | |
726f6388 | 5065 | |
ccc6cda3 JA |
5066 | args[0] = shell_name; |
5067 | args[1] = command; | |
5068 | args[larray] = (char *)NULL; | |
726f6388 | 5069 | |
ccc6cda3 JA |
5070 | if (args[0][0] == '-') |
5071 | args[0]++; | |
726f6388 | 5072 | |
ccc6cda3 JA |
5073 | #if defined (RESTRICTED_SHELL) |
5074 | if (restricted) | |
5075 | change_flag ('r', FLAG_OFF); | |
5076 | #endif | |
726f6388 | 5077 | |
ccc6cda3 JA |
5078 | if (subshell_argv) |
5079 | { | |
5080 | /* Can't free subshell_argv[0]; that is shell_name. */ | |
5081 | for (i = 1; i < subshell_argc; i++) | |
5082 | free (subshell_argv[i]); | |
5083 | free (subshell_argv); | |
5084 | } | |
5085 | ||
5086 | dispose_command (currently_executing_command); /* XXX */ | |
5087 | currently_executing_command = (COMMAND *)NULL; | |
5088 | ||
5089 | subshell_argc = larray; | |
5090 | subshell_argv = args; | |
5091 | subshell_envp = env; | |
5092 | ||
5093 | unbind_args (); /* remove the positional parameters */ | |
5094 | ||
5095 | longjmp (subshell_top_level, 1); | |
f73dda09 | 5096 | /*NOTREACHED*/ |
ccc6cda3 JA |
5097 | } |
5098 | ||
5099 | static int | |
5100 | execute_intern_function (name, function) | |
5101 | WORD_DESC *name; | |
5102 | COMMAND *function; | |
5103 | { | |
5104 | SHELL_VAR *var; | |
5105 | ||
5106 | if (check_identifier (name, posixly_correct) == 0) | |
5107 | { | |
5108 | if (posixly_correct && interactive_shell == 0) | |
5109 | { | |
3185942a | 5110 | last_command_exit_value = EX_BADUSAGE; |
b80f6443 | 5111 | jump_to_top_level (ERREXIT); |
ccc6cda3 JA |
5112 | } |
5113 | return (EXECUTION_FAILURE); | |
5114 | } | |
5115 | ||
5116 | var = find_function (name->word); | |
28ef6c31 | 5117 | if (var && (readonly_p (var) || noassign_p (var))) |
ccc6cda3 | 5118 | { |
28ef6c31 | 5119 | if (readonly_p (var)) |
b80f6443 | 5120 | internal_error (_("%s: readonly function"), var->name); |
ccc6cda3 JA |
5121 | return (EXECUTION_FAILURE); |
5122 | } | |
5123 | ||
5124 | bind_function (name->word, function); | |
5125 | return (EXECUTION_SUCCESS); | |
726f6388 JA |
5126 | } |
5127 | ||
d166f048 | 5128 | #if defined (INCLUDE_UNUSED) |
726f6388 | 5129 | #if defined (PROCESS_SUBSTITUTION) |
726f6388 JA |
5130 | void |
5131 | close_all_files () | |
5132 | { | |
5133 | register int i, fd_table_size; | |
5134 | ||
5135 | fd_table_size = getdtablesize (); | |
5136 | if (fd_table_size > 256) /* clamp to a reasonable value */ | |
7117c2d2 | 5137 | fd_table_size = 256; |
726f6388 JA |
5138 | |
5139 | for (i = 3; i < fd_table_size; i++) | |
5140 | close (i); | |
5141 | } | |
5142 | #endif /* PROCESS_SUBSTITUTION */ | |
d166f048 | 5143 | #endif |
726f6388 JA |
5144 | |
5145 | static void | |
5146 | close_pipes (in, out) | |
5147 | int in, out; | |
5148 | { | |
5149 | if (in >= 0) | |
5150 | close (in); | |
5151 | if (out >= 0) | |
5152 | close (out); | |
5153 | } | |
5154 | ||
b80f6443 JA |
5155 | static void |
5156 | dup_error (oldd, newd) | |
5157 | int oldd, newd; | |
5158 | { | |
5159 | sys_error (_("cannot duplicate fd %d to fd %d"), oldd, newd); | |
5160 | } | |
5161 | ||
726f6388 JA |
5162 | /* Redirect input and output to be from and to the specified pipes. |
5163 | NO_PIPE and REDIRECT_BOTH are handled correctly. */ | |
5164 | static void | |
5165 | do_piping (pipe_in, pipe_out) | |
5166 | int pipe_in, pipe_out; | |
5167 | { | |
5168 | if (pipe_in != NO_PIPE) | |
5169 | { | |
5170 | if (dup2 (pipe_in, 0) < 0) | |
b80f6443 | 5171 | dup_error (pipe_in, 0); |
726f6388 | 5172 | if (pipe_in > 0) |
cce855bc | 5173 | close (pipe_in); |
495aee44 CR |
5174 | #ifdef __CYGWIN__ |
5175 | /* Let stdio know the fd may have changed from text to binary mode. */ | |
5176 | freopen (NULL, "r", stdin); | |
5177 | #endif /* __CYGWIN__ */ | |
726f6388 JA |
5178 | } |
5179 | if (pipe_out != NO_PIPE) | |
5180 | { | |
5181 | if (pipe_out != REDIRECT_BOTH) | |
5182 | { | |
5183 | if (dup2 (pipe_out, 1) < 0) | |
b80f6443 | 5184 | dup_error (pipe_out, 1); |
726f6388 JA |
5185 | if (pipe_out == 0 || pipe_out > 1) |
5186 | close (pipe_out); | |
5187 | } | |
5188 | else | |
ccc6cda3 | 5189 | { |
cce855bc | 5190 | if (dup2 (1, 2) < 0) |
b80f6443 | 5191 | dup_error (1, 2); |
ccc6cda3 | 5192 | } |
495aee44 CR |
5193 | #ifdef __CYGWIN__ |
5194 | /* Let stdio know the fd may have changed from text to binary mode, and | |
5195 | make sure to preserve stdout line buffering. */ | |
5196 | freopen (NULL, "w", stdout); | |
5197 | sh_setlinebuf (stdout); | |
5198 | #endif /* __CYGWIN__ */ | |
d166f048 | 5199 | } |
726f6388 | 5200 | } |