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Commit | Line | Data |
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726f6388 JA |
1 | /* execute_command.c -- Execute a COMMAND structure. */ |
2 | ||
7117c2d2 | 3 | /* Copyright (C) 1987-2002 Free Software Foundation, Inc. |
726f6388 JA |
4 | |
5 | This file is part of GNU Bash, the Bourne Again SHell. | |
6 | ||
7 | Bash is free software; you can redistribute it and/or modify it | |
8 | under the terms of the GNU General Public License as published by | |
bb70624e | 9 | the Free Software Foundation; either version 2, or (at your option) |
726f6388 JA |
10 | any later version. |
11 | ||
12 | Bash is distributed in the hope that it will be useful, but WITHOUT | |
13 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |
14 | or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public | |
15 | License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with Bash; see the file COPYING. If not, write to the Free | |
bb70624e | 19 | Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */ |
ccc6cda3 JA |
20 | #include "config.h" |
21 | ||
22 | #if !defined (__GNUC__) && !defined (HAVE_ALLOCA_H) && defined (_AIX) | |
726f6388 | 23 | #pragma alloca |
ccc6cda3 | 24 | #endif /* _AIX && RISC6000 && !__GNUC__ */ |
726f6388 JA |
25 | |
26 | #include <stdio.h> | |
f73dda09 | 27 | #include "chartypes.h" |
726f6388 | 28 | #include "bashtypes.h" |
cce855bc JA |
29 | #ifndef _MINIX |
30 | # include <sys/file.h> | |
31 | #endif | |
726f6388 JA |
32 | #include "filecntl.h" |
33 | #include "posixstat.h" | |
34 | #include <signal.h> | |
cce855bc JA |
35 | #ifndef _MINIX |
36 | # include <sys/param.h> | |
37 | #endif | |
726f6388 | 38 | |
ccc6cda3 JA |
39 | #if defined (HAVE_UNISTD_H) |
40 | # include <unistd.h> | |
41 | #endif | |
42 | ||
bb70624e | 43 | #include "posixtime.h" |
ccc6cda3 | 44 | |
cce855bc | 45 | #if defined (HAVE_SYS_RESOURCE_H) && !defined (RLIMTYPE) |
ccc6cda3 JA |
46 | # include <sys/resource.h> |
47 | #endif | |
48 | ||
49 | #if defined (HAVE_SYS_TIMES_H) && defined (HAVE_TIMES) | |
50 | # include <sys/times.h> | |
726f6388 JA |
51 | #endif |
52 | ||
726f6388 JA |
53 | #include <errno.h> |
54 | ||
55 | #if !defined (errno) | |
56 | extern int errno; | |
57 | #endif | |
58 | ||
ccc6cda3 | 59 | #include "bashansi.h" |
726f6388 | 60 | |
ccc6cda3 | 61 | #include "memalloc.h" |
726f6388 | 62 | #include "shell.h" |
d166f048 | 63 | #include <y.tab.h> /* use <...> so we pick it up from the build directory */ |
726f6388 | 64 | #include "flags.h" |
ccc6cda3 JA |
65 | #include "builtins.h" |
66 | #include "hashlib.h" | |
726f6388 JA |
67 | #include "jobs.h" |
68 | #include "execute_cmd.h" | |
cce855bc JA |
69 | #include "findcmd.h" |
70 | #include "redir.h" | |
ccc6cda3 JA |
71 | #include "trap.h" |
72 | #include "pathexp.h" | |
d166f048 | 73 | #include "hashcmd.h" |
726f6388 | 74 | |
cce855bc JA |
75 | #if defined (COND_COMMAND) |
76 | # include "test.h" | |
77 | #endif | |
78 | ||
726f6388 JA |
79 | #include "builtins/common.h" |
80 | #include "builtins/builtext.h" /* list of builtins */ | |
81 | ||
f73dda09 | 82 | #include <glob/strmatch.h> |
726f6388 JA |
83 | #include <tilde/tilde.h> |
84 | ||
85 | #if defined (BUFFERED_INPUT) | |
86 | # include "input.h" | |
87 | #endif | |
88 | ||
ccc6cda3 JA |
89 | #if defined (ALIAS) |
90 | # include "alias.h" | |
91 | #endif | |
92 | ||
93 | #if defined (HISTORY) | |
94 | # include "bashhist.h" | |
95 | #endif | |
96 | ||
726f6388 | 97 | extern int posixly_correct; |
f73dda09 JA |
98 | extern int breaking, continuing, loop_level; |
99 | extern int expand_aliases; | |
d166f048 | 100 | extern int parse_and_execute_level, running_trap, trap_line_number; |
f73dda09 | 101 | extern int command_string_index, line_number; |
726f6388 | 102 | extern int dot_found_in_search; |
ccc6cda3 | 103 | extern int already_making_children; |
726f6388 JA |
104 | extern char *the_printed_command, *shell_name; |
105 | extern pid_t last_command_subst_pid; | |
f73dda09 | 106 | extern sh_builtin_func_t *last_shell_builtin, *this_shell_builtin; |
726f6388 | 107 | extern char **subshell_argv, **subshell_envp; |
ccc6cda3 | 108 | extern int subshell_argc; |
f73dda09 | 109 | #if 0 |
ccc6cda3 | 110 | extern char *glob_argv_flags; |
f73dda09 | 111 | #endif |
726f6388 | 112 | |
f73dda09 | 113 | extern int close __P((int)); |
726f6388 JA |
114 | |
115 | /* Static functions defined and used in this file. */ | |
f73dda09 JA |
116 | static void close_pipes __P((int, int)); |
117 | static void do_piping __P((int, int)); | |
118 | static void bind_lastarg __P((char *)); | |
119 | static int shell_control_structure __P((enum command_type)); | |
120 | static void cleanup_redirects __P((REDIRECT *)); | |
121 | ||
122 | #if defined (JOB_CONTROL) | |
123 | static int restore_signal_mask __P((sigset_t *)); | |
124 | #endif | |
ccc6cda3 | 125 | |
f73dda09 JA |
126 | static void async_redirect_stdin __P((void)); |
127 | ||
128 | static int builtin_status __P((int)); | |
129 | ||
130 | static int execute_for_command __P((FOR_COM *)); | |
ccc6cda3 | 131 | #if defined (SELECT_COMMAND) |
f73dda09 JA |
132 | static int print_index_and_element __P((int, int, WORD_LIST *)); |
133 | static void indent __P((int, int)); | |
134 | static void print_select_list __P((WORD_LIST *, int, int, int)); | |
7117c2d2 | 135 | static char *select_query __P((WORD_LIST *, int, char *, int)); |
f73dda09 | 136 | static int execute_select_command __P((SELECT_COM *)); |
ccc6cda3 | 137 | #endif |
cce855bc | 138 | #if defined (DPAREN_ARITHMETIC) |
f73dda09 | 139 | static int execute_arith_command __P((ARITH_COM *)); |
cce855bc JA |
140 | #endif |
141 | #if defined (COND_COMMAND) | |
f73dda09 JA |
142 | static int execute_cond_node __P((COND_COM *)); |
143 | static int execute_cond_command __P((COND_COM *)); | |
cce855bc | 144 | #endif |
d166f048 | 145 | #if defined (COMMAND_TIMING) |
f73dda09 JA |
146 | static int mkfmt __P((char *, int, int, time_t, int)); |
147 | static void print_formatted_time __P((FILE *, char *, | |
148 | time_t, int, time_t, int, | |
149 | time_t, int, int)); | |
150 | static int time_command __P((COMMAND *, int, int, int, struct fd_bitmap *)); | |
d166f048 | 151 | #endif |
bb70624e | 152 | #if defined (ARITH_FOR_COMMAND) |
7117c2d2 | 153 | static intmax_t eval_arith_for_expr __P((WORD_LIST *, int *)); |
f73dda09 | 154 | static int execute_arith_for_command __P((ARITH_FOR_COM *)); |
bb70624e | 155 | #endif |
f73dda09 JA |
156 | static int execute_case_command __P((CASE_COM *)); |
157 | static int execute_while_command __P((WHILE_COM *)); | |
158 | static int execute_until_command __P((WHILE_COM *)); | |
159 | static int execute_while_or_until __P((WHILE_COM *, int)); | |
160 | static int execute_if_command __P((IF_COM *)); | |
161 | static int execute_null_command __P((REDIRECT *, int, int, int, pid_t)); | |
162 | static void fix_assignment_words __P((WORD_LIST *)); | |
163 | static int execute_simple_command __P((SIMPLE_COM *, int, int, int, struct fd_bitmap *)); | |
164 | static int execute_builtin __P((sh_builtin_func_t *, WORD_LIST *, int, int)); | |
165 | static int execute_function __P((SHELL_VAR *, WORD_LIST *, int, struct fd_bitmap *, int, int)); | |
166 | static int execute_builtin_or_function __P((WORD_LIST *, sh_builtin_func_t *, | |
167 | SHELL_VAR *, | |
168 | REDIRECT *, struct fd_bitmap *, int)); | |
169 | static void execute_subshell_builtin_or_function __P((WORD_LIST *, REDIRECT *, | |
170 | sh_builtin_func_t *, | |
171 | SHELL_VAR *, | |
172 | int, int, int, | |
173 | struct fd_bitmap *, | |
174 | int)); | |
175 | static void execute_disk_command __P((WORD_LIST *, REDIRECT *, char *, | |
176 | int, int, int, struct fd_bitmap *, int)); | |
177 | ||
178 | static char *getinterp __P((char *, int, int *)); | |
179 | static void initialize_subshell __P((void)); | |
180 | static int execute_in_subshell __P((COMMAND *, int, int, int, struct fd_bitmap *)); | |
181 | ||
182 | static int execute_pipeline __P((COMMAND *, int, int, int, struct fd_bitmap *)); | |
183 | ||
184 | static int execute_connection __P((COMMAND *, int, int, int, struct fd_bitmap *)); | |
185 | ||
186 | static int execute_intern_function __P((WORD_DESC *, COMMAND *)); | |
187 | ||
726f6388 | 188 | /* The line number that the currently executing function starts on. */ |
ccc6cda3 | 189 | static int function_line_number; |
726f6388 | 190 | |
d166f048 JA |
191 | /* Set to 1 if fd 0 was the subject of redirection to a subshell. Global |
192 | so that reader_loop can set it to zero before executing a command. */ | |
193 | int stdin_redir; | |
726f6388 JA |
194 | |
195 | /* The name of the command that is currently being executed. | |
196 | `test' needs this, for example. */ | |
197 | char *this_command_name; | |
198 | ||
ccc6cda3 JA |
199 | static COMMAND *currently_executing_command; |
200 | ||
726f6388 JA |
201 | struct stat SB; /* used for debugging */ |
202 | ||
ccc6cda3 | 203 | static int special_builtin_failed; |
d166f048 | 204 | |
726f6388 | 205 | /* For catching RETURN in a function. */ |
ccc6cda3 | 206 | int return_catch_flag; |
726f6388 | 207 | int return_catch_value; |
ccc6cda3 | 208 | procenv_t return_catch; |
726f6388 JA |
209 | |
210 | /* The value returned by the last synchronous command. */ | |
ccc6cda3 | 211 | int last_command_exit_value; |
726f6388 JA |
212 | |
213 | /* The list of redirections to perform which will undo the redirections | |
214 | that I made in the shell. */ | |
215 | REDIRECT *redirection_undo_list = (REDIRECT *)NULL; | |
216 | ||
217 | /* The list of redirections to perform which will undo the internal | |
218 | redirections performed by the `exec' builtin. These are redirections | |
219 | that must be undone even when exec discards redirection_undo_list. */ | |
220 | REDIRECT *exec_redirection_undo_list = (REDIRECT *)NULL; | |
221 | ||
222 | /* Non-zero if we have just forked and are currently running in a subshell | |
223 | environment. */ | |
ccc6cda3 JA |
224 | int subshell_environment; |
225 | ||
bb70624e JA |
226 | /* Currently-executing shell function. */ |
227 | SHELL_VAR *this_shell_function; | |
228 | ||
726f6388 JA |
229 | struct fd_bitmap *current_fds_to_close = (struct fd_bitmap *)NULL; |
230 | ||
f73dda09 | 231 | #define FD_BITMAP_DEFAULT_SIZE 32 |
d166f048 | 232 | |
726f6388 JA |
233 | /* Functions to allocate and deallocate the structures used to pass |
234 | information from the shell to its children about file descriptors | |
235 | to close. */ | |
236 | struct fd_bitmap * | |
237 | new_fd_bitmap (size) | |
f73dda09 | 238 | int size; |
726f6388 JA |
239 | { |
240 | struct fd_bitmap *ret; | |
241 | ||
242 | ret = (struct fd_bitmap *)xmalloc (sizeof (struct fd_bitmap)); | |
243 | ||
244 | ret->size = size; | |
245 | ||
246 | if (size) | |
247 | { | |
f73dda09 | 248 | ret->bitmap = (char *)xmalloc (size); |
7117c2d2 | 249 | memset (ret->bitmap, '\0', size); |
726f6388 JA |
250 | } |
251 | else | |
252 | ret->bitmap = (char *)NULL; | |
253 | return (ret); | |
254 | } | |
255 | ||
256 | void | |
257 | dispose_fd_bitmap (fdbp) | |
258 | struct fd_bitmap *fdbp; | |
259 | { | |
260 | FREE (fdbp->bitmap); | |
261 | free (fdbp); | |
262 | } | |
263 | ||
264 | void | |
265 | close_fd_bitmap (fdbp) | |
266 | struct fd_bitmap *fdbp; | |
267 | { | |
268 | register int i; | |
269 | ||
270 | if (fdbp) | |
271 | { | |
272 | for (i = 0; i < fdbp->size; i++) | |
273 | if (fdbp->bitmap[i]) | |
274 | { | |
275 | close (i); | |
276 | fdbp->bitmap[i] = 0; | |
277 | } | |
278 | } | |
279 | } | |
280 | ||
ccc6cda3 JA |
281 | /* Return the line number of the currently executing command. */ |
282 | int | |
283 | executing_line_number () | |
284 | { | |
7117c2d2 JA |
285 | if (executing && (variable_context == 0 || interactive_shell == 0) && currently_executing_command) |
286 | { | |
287 | if (currently_executing_command->type == cm_simple) | |
288 | return currently_executing_command->value.Simple->line; | |
289 | else if (currently_executing_command->type == cm_cond) | |
290 | return currently_executing_command->value.Cond->line; | |
291 | else if (currently_executing_command->type == cm_arith) | |
292 | return currently_executing_command->value.Arith->line; | |
293 | else if (currently_executing_command->type == cm_arith_for) | |
294 | return currently_executing_command->value.ArithFor->line; | |
295 | else | |
296 | return line_number; | |
297 | } | |
d166f048 JA |
298 | else if (running_trap) |
299 | return trap_line_number; | |
300 | else | |
301 | return line_number; | |
ccc6cda3 JA |
302 | } |
303 | ||
726f6388 JA |
304 | /* Execute the command passed in COMMAND. COMMAND is exactly what |
305 | read_command () places into GLOBAL_COMMAND. See "command.h" for the | |
306 | details of the command structure. | |
307 | ||
308 | EXECUTION_SUCCESS or EXECUTION_FAILURE are the only possible | |
309 | return values. Executing a command with nothing in it returns | |
310 | EXECUTION_SUCCESS. */ | |
ccc6cda3 | 311 | int |
726f6388 JA |
312 | execute_command (command) |
313 | COMMAND *command; | |
314 | { | |
315 | struct fd_bitmap *bitmap; | |
316 | int result; | |
317 | ||
318 | current_fds_to_close = (struct fd_bitmap *)NULL; | |
319 | bitmap = new_fd_bitmap (FD_BITMAP_DEFAULT_SIZE); | |
320 | begin_unwind_frame ("execute-command"); | |
321 | add_unwind_protect (dispose_fd_bitmap, (char *)bitmap); | |
322 | ||
323 | /* Just do the command, but not asynchronously. */ | |
324 | result = execute_command_internal (command, 0, NO_PIPE, NO_PIPE, bitmap); | |
325 | ||
326 | dispose_fd_bitmap (bitmap); | |
327 | discard_unwind_frame ("execute-command"); | |
328 | ||
329 | #if defined (PROCESS_SUBSTITUTION) | |
bb70624e JA |
330 | /* don't unlink fifos if we're in a shell function; wait until the function |
331 | returns. */ | |
332 | if (variable_context == 0) | |
333 | unlink_fifo_list (); | |
726f6388 JA |
334 | #endif /* PROCESS_SUBSTITUTION */ |
335 | ||
336 | return (result); | |
337 | } | |
338 | ||
339 | /* Return 1 if TYPE is a shell control structure type. */ | |
340 | static int | |
341 | shell_control_structure (type) | |
342 | enum command_type type; | |
343 | { | |
344 | switch (type) | |
345 | { | |
346 | case cm_for: | |
bb70624e JA |
347 | #if defined (ARITH_FOR_COMMAND) |
348 | case cm_arith_for: | |
349 | #endif | |
726f6388 JA |
350 | #if defined (SELECT_COMMAND) |
351 | case cm_select: | |
cce855bc JA |
352 | #endif |
353 | #if defined (DPAREN_ARITHMETIC) | |
354 | case cm_arith: | |
355 | #endif | |
356 | #if defined (COND_COMMAND) | |
357 | case cm_cond: | |
726f6388 JA |
358 | #endif |
359 | case cm_case: | |
360 | case cm_while: | |
361 | case cm_until: | |
362 | case cm_if: | |
363 | case cm_group: | |
364 | return (1); | |
365 | ||
366 | default: | |
367 | return (0); | |
368 | } | |
369 | } | |
370 | ||
371 | /* A function to use to unwind_protect the redirection undo list | |
372 | for loops. */ | |
373 | static void | |
374 | cleanup_redirects (list) | |
375 | REDIRECT *list; | |
376 | { | |
377 | do_redirections (list, 1, 0, 0); | |
378 | dispose_redirects (list); | |
379 | } | |
380 | ||
ccc6cda3 | 381 | #if 0 |
726f6388 JA |
382 | /* Function to unwind_protect the redirections for functions and builtins. */ |
383 | static void | |
384 | cleanup_func_redirects (list) | |
385 | REDIRECT *list; | |
386 | { | |
387 | do_redirections (list, 1, 0, 0); | |
388 | } | |
ccc6cda3 | 389 | #endif |
726f6388 | 390 | |
cce855bc | 391 | void |
726f6388 JA |
392 | dispose_exec_redirects () |
393 | { | |
394 | if (exec_redirection_undo_list) | |
395 | { | |
396 | dispose_redirects (exec_redirection_undo_list); | |
397 | exec_redirection_undo_list = (REDIRECT *)NULL; | |
398 | } | |
399 | } | |
400 | ||
401 | #if defined (JOB_CONTROL) | |
402 | /* A function to restore the signal mask to its proper value when the shell | |
403 | is interrupted or errors occur while creating a pipeline. */ | |
404 | static int | |
405 | restore_signal_mask (set) | |
f73dda09 | 406 | sigset_t *set; |
726f6388 | 407 | { |
f73dda09 | 408 | return (sigprocmask (SIG_SETMASK, set, (sigset_t *)NULL)); |
726f6388 JA |
409 | } |
410 | #endif /* JOB_CONTROL */ | |
411 | ||
f73dda09 | 412 | #ifdef DEBUG |
726f6388 JA |
413 | /* A debugging function that can be called from gdb, for instance. */ |
414 | void | |
415 | open_files () | |
416 | { | |
417 | register int i; | |
418 | int f, fd_table_size; | |
419 | ||
420 | fd_table_size = getdtablesize (); | |
421 | ||
f73dda09 | 422 | fprintf (stderr, "pid %ld open files:", (long)getpid ()); |
726f6388 JA |
423 | for (i = 3; i < fd_table_size; i++) |
424 | { | |
425 | if ((f = fcntl (i, F_GETFD, 0)) != -1) | |
426 | fprintf (stderr, " %d (%s)", i, f ? "close" : "open"); | |
427 | } | |
428 | fprintf (stderr, "\n"); | |
429 | } | |
f73dda09 | 430 | #endif |
726f6388 | 431 | |
d166f048 JA |
432 | static void |
433 | async_redirect_stdin () | |
434 | { | |
435 | int fd; | |
436 | ||
437 | fd = open ("/dev/null", O_RDONLY); | |
438 | if (fd > 0) | |
439 | { | |
440 | dup2 (fd, 0); | |
441 | close (fd); | |
442 | } | |
443 | else if (fd < 0) | |
444 | internal_error ("cannot redirect standard input from /dev/null: %s", strerror (errno)); | |
445 | } | |
446 | ||
ccc6cda3 | 447 | #define DESCRIBE_PID(pid) do { if (interactive) describe_pid (pid); } while (0) |
726f6388 JA |
448 | |
449 | /* Execute the command passed in COMMAND, perhaps doing it asynchrounously. | |
450 | COMMAND is exactly what read_command () places into GLOBAL_COMMAND. | |
451 | ASYNCHROUNOUS, if non-zero, says to do this command in the background. | |
452 | PIPE_IN and PIPE_OUT are file descriptors saying where input comes | |
453 | from and where it goes. They can have the value of NO_PIPE, which means | |
454 | I/O is stdin/stdout. | |
455 | FDS_TO_CLOSE is a list of file descriptors to close once the child has | |
456 | been forked. This list often contains the unusable sides of pipes, etc. | |
457 | ||
458 | EXECUTION_SUCCESS or EXECUTION_FAILURE are the only possible | |
459 | return values. Executing a command with nothing in it returns | |
460 | EXECUTION_SUCCESS. */ | |
ccc6cda3 JA |
461 | int |
462 | execute_command_internal (command, asynchronous, pipe_in, pipe_out, | |
726f6388 JA |
463 | fds_to_close) |
464 | COMMAND *command; | |
465 | int asynchronous; | |
466 | int pipe_in, pipe_out; | |
467 | struct fd_bitmap *fds_to_close; | |
468 | { | |
7117c2d2 | 469 | int exec_result, invert, ignore_return, was_error_trap; |
d166f048 | 470 | REDIRECT *my_undo_list, *exec_undo_list; |
cce855bc | 471 | volatile pid_t last_pid; |
726f6388 | 472 | |
ccc6cda3 | 473 | if (command == 0 || breaking || continuing || read_but_dont_execute) |
726f6388 JA |
474 | return (EXECUTION_SUCCESS); |
475 | ||
476 | run_pending_traps (); | |
477 | ||
ccc6cda3 JA |
478 | if (running_trap == 0) |
479 | currently_executing_command = command; | |
480 | ||
726f6388 | 481 | invert = (command->flags & CMD_INVERT_RETURN) != 0; |
d166f048 JA |
482 | |
483 | /* If we're inverting the return value and `set -e' has been executed, | |
484 | we don't want a failing command to inadvertently cause the shell | |
485 | to exit. */ | |
486 | if (exit_immediately_on_error && invert) /* XXX */ | |
487 | command->flags |= CMD_IGNORE_RETURN; /* XXX */ | |
488 | ||
ccc6cda3 | 489 | exec_result = EXECUTION_SUCCESS; |
726f6388 JA |
490 | |
491 | /* If a command was being explicitly run in a subshell, or if it is | |
492 | a shell control-structure, and it has a pipe, then we do the command | |
493 | in a subshell. */ | |
bb70624e JA |
494 | if (command->type == cm_subshell && (command->flags & CMD_NO_FORK)) |
495 | return (execute_in_subshell (command, asynchronous, pipe_in, pipe_out, fds_to_close)); | |
726f6388 | 496 | |
bb70624e JA |
497 | if (command->type == cm_subshell || |
498 | (command->flags & (CMD_WANT_SUBSHELL|CMD_FORCE_SUBSHELL)) || | |
726f6388 JA |
499 | (shell_control_structure (command->type) && |
500 | (pipe_out != NO_PIPE || pipe_in != NO_PIPE || asynchronous))) | |
501 | { | |
502 | pid_t paren_pid; | |
503 | ||
504 | /* Fork a subshell, turn off the subshell bit, turn off job | |
505 | control and call execute_command () on the command again. */ | |
506 | paren_pid = make_child (savestring (make_command_string (command)), | |
507 | asynchronous); | |
508 | if (paren_pid == 0) | |
28ef6c31 JA |
509 | exit (execute_in_subshell (command, asynchronous, pipe_in, pipe_out, fds_to_close)); |
510 | /* NOTREACHED */ | |
726f6388 JA |
511 | else |
512 | { | |
513 | close_pipes (pipe_in, pipe_out); | |
514 | ||
515 | #if defined (PROCESS_SUBSTITUTION) && defined (HAVE_DEV_FD) | |
516 | unlink_fifo_list (); | |
517 | #endif | |
518 | /* If we are part of a pipeline, and not the end of the pipeline, | |
519 | then we should simply return and let the last command in the | |
520 | pipe be waited for. If we are not in a pipeline, or are the | |
ccc6cda3 | 521 | last command in the pipeline, then we wait for the subshell |
726f6388 JA |
522 | and return its exit status as usual. */ |
523 | if (pipe_out != NO_PIPE) | |
524 | return (EXECUTION_SUCCESS); | |
525 | ||
526 | stop_pipeline (asynchronous, (COMMAND *)NULL); | |
527 | ||
ccc6cda3 | 528 | if (asynchronous == 0) |
726f6388 JA |
529 | { |
530 | last_command_exit_value = wait_for (paren_pid); | |
531 | ||
532 | /* If we have to, invert the return value. */ | |
533 | if (invert) | |
bb70624e JA |
534 | exec_result = ((last_command_exit_value == EXECUTION_SUCCESS) |
535 | ? EXECUTION_FAILURE | |
536 | : EXECUTION_SUCCESS); | |
726f6388 | 537 | else |
bb70624e JA |
538 | exec_result = last_command_exit_value; |
539 | ||
540 | return (last_command_exit_value = exec_result); | |
726f6388 JA |
541 | } |
542 | else | |
543 | { | |
544 | DESCRIBE_PID (paren_pid); | |
545 | ||
546 | run_pending_traps (); | |
547 | ||
548 | return (EXECUTION_SUCCESS); | |
549 | } | |
550 | } | |
551 | } | |
552 | ||
d166f048 JA |
553 | #if defined (COMMAND_TIMING) |
554 | if (command->flags & CMD_TIME_PIPELINE) | |
555 | { | |
556 | if (asynchronous) | |
557 | { | |
558 | command->flags |= CMD_FORCE_SUBSHELL; | |
559 | exec_result = execute_command_internal (command, 1, pipe_in, pipe_out, fds_to_close); | |
560 | } | |
561 | else | |
562 | { | |
563 | exec_result = time_command (command, asynchronous, pipe_in, pipe_out, fds_to_close); | |
564 | if (running_trap == 0) | |
565 | currently_executing_command = (COMMAND *)NULL; | |
566 | } | |
567 | return (exec_result); | |
568 | } | |
569 | #endif /* COMMAND_TIMING */ | |
570 | ||
571 | if (shell_control_structure (command->type) && command->redirects) | |
572 | stdin_redir = stdin_redirects (command->redirects); | |
573 | ||
726f6388 JA |
574 | /* Handle WHILE FOR CASE etc. with redirections. (Also '&' input |
575 | redirection.) */ | |
576 | if (do_redirections (command->redirects, 1, 1, 0) != 0) | |
577 | { | |
578 | cleanup_redirects (redirection_undo_list); | |
579 | redirection_undo_list = (REDIRECT *)NULL; | |
580 | dispose_exec_redirects (); | |
581 | return (EXECUTION_FAILURE); | |
582 | } | |
583 | ||
584 | if (redirection_undo_list) | |
585 | { | |
586 | my_undo_list = (REDIRECT *)copy_redirects (redirection_undo_list); | |
587 | dispose_redirects (redirection_undo_list); | |
588 | redirection_undo_list = (REDIRECT *)NULL; | |
589 | } | |
590 | else | |
591 | my_undo_list = (REDIRECT *)NULL; | |
592 | ||
593 | if (exec_redirection_undo_list) | |
594 | { | |
595 | exec_undo_list = (REDIRECT *)copy_redirects (exec_redirection_undo_list); | |
596 | dispose_redirects (exec_redirection_undo_list); | |
597 | exec_redirection_undo_list = (REDIRECT *)NULL; | |
598 | } | |
599 | else | |
600 | exec_undo_list = (REDIRECT *)NULL; | |
601 | ||
602 | if (my_undo_list || exec_undo_list) | |
603 | begin_unwind_frame ("loop_redirections"); | |
604 | ||
605 | if (my_undo_list) | |
606 | add_unwind_protect ((Function *)cleanup_redirects, my_undo_list); | |
607 | ||
608 | if (exec_undo_list) | |
609 | add_unwind_protect ((Function *)dispose_redirects, exec_undo_list); | |
610 | ||
611 | ignore_return = (command->flags & CMD_IGNORE_RETURN) != 0; | |
612 | ||
613 | QUIT; | |
614 | ||
615 | switch (command->type) | |
616 | { | |
ccc6cda3 JA |
617 | case cm_simple: |
618 | { | |
619 | /* We can't rely on this variable retaining its value across a | |
620 | call to execute_simple_command if a longjmp occurs as the | |
621 | result of a `return' builtin. This is true for sure with gcc. */ | |
622 | last_pid = last_made_pid; | |
f73dda09 | 623 | was_error_trap = signal_is_trapped (ERROR_TRAP) && signal_is_ignored (ERROR_TRAP) == 0; |
ccc6cda3 JA |
624 | |
625 | if (ignore_return && command->value.Simple) | |
626 | command->value.Simple->flags |= CMD_IGNORE_RETURN; | |
d166f048 JA |
627 | if (command->flags & CMD_STDIN_REDIR) |
628 | command->value.Simple->flags |= CMD_STDIN_REDIR; | |
ccc6cda3 JA |
629 | exec_result = |
630 | execute_simple_command (command->value.Simple, pipe_in, pipe_out, | |
631 | asynchronous, fds_to_close); | |
632 | ||
633 | /* The temporary environment should be used for only the simple | |
634 | command immediately following its definition. */ | |
635 | dispose_used_env_vars (); | |
636 | ||
637 | #if (defined (ultrix) && defined (mips)) || defined (C_ALLOCA) | |
638 | /* Reclaim memory allocated with alloca () on machines which | |
639 | may be using the alloca emulation code. */ | |
640 | (void) alloca (0); | |
641 | #endif /* (ultrix && mips) || C_ALLOCA */ | |
642 | ||
643 | /* If we forked to do the command, then we must wait_for () | |
644 | the child. */ | |
645 | ||
646 | /* XXX - this is something to watch out for if there are problems | |
647 | when the shell is compiled without job control. */ | |
648 | if (already_making_children && pipe_out == NO_PIPE && | |
649 | last_pid != last_made_pid) | |
650 | { | |
651 | stop_pipeline (asynchronous, (COMMAND *)NULL); | |
652 | ||
653 | if (asynchronous) | |
654 | { | |
655 | DESCRIBE_PID (last_made_pid); | |
656 | } | |
657 | else | |
658 | #if !defined (JOB_CONTROL) | |
659 | /* Do not wait for asynchronous processes started from | |
660 | startup files. */ | |
661 | if (last_made_pid != last_asynchronous_pid) | |
662 | #endif | |
663 | /* When executing a shell function that executes other | |
664 | commands, this causes the last simple command in | |
665 | the function to be waited for twice. */ | |
666 | exec_result = wait_for (last_made_pid); | |
b72432fd JA |
667 | #if defined (RECYCLES_PIDS) |
668 | /* LynxOS, for one, recycles pids very quickly -- so quickly | |
669 | that a new process may have the same pid as the last one | |
670 | created. This has been reported to fix the problem. */ | |
671 | if (exec_result == 0) | |
672 | last_made_pid = NO_PID; | |
673 | #endif | |
ccc6cda3 JA |
674 | } |
675 | } | |
676 | ||
f73dda09 JA |
677 | if (was_error_trap && ignore_return == 0 && invert == 0 && exec_result != EXECUTION_SUCCESS) |
678 | { | |
679 | last_command_exit_value = exec_result; | |
680 | run_error_trap (); | |
681 | } | |
682 | ||
ccc6cda3 | 683 | if (ignore_return == 0 && invert == 0 && |
cce855bc | 684 | ((posixly_correct && interactive == 0 && special_builtin_failed) || |
ccc6cda3 JA |
685 | (exit_immediately_on_error && (exec_result != EXECUTION_SUCCESS)))) |
686 | { | |
687 | last_command_exit_value = exec_result; | |
688 | run_pending_traps (); | |
689 | jump_to_top_level (EXITPROG); | |
690 | } | |
691 | ||
692 | break; | |
693 | ||
726f6388 JA |
694 | case cm_for: |
695 | if (ignore_return) | |
696 | command->value.For->flags |= CMD_IGNORE_RETURN; | |
697 | exec_result = execute_for_command (command->value.For); | |
698 | break; | |
699 | ||
bb70624e JA |
700 | #if defined (ARITH_FOR_COMMAND) |
701 | case cm_arith_for: | |
702 | if (ignore_return) | |
703 | command->value.ArithFor->flags |= CMD_IGNORE_RETURN; | |
704 | exec_result = execute_arith_for_command (command->value.ArithFor); | |
705 | break; | |
706 | #endif | |
707 | ||
726f6388 JA |
708 | #if defined (SELECT_COMMAND) |
709 | case cm_select: | |
710 | if (ignore_return) | |
711 | command->value.Select->flags |= CMD_IGNORE_RETURN; | |
712 | exec_result = execute_select_command (command->value.Select); | |
713 | break; | |
714 | #endif | |
715 | ||
716 | case cm_case: | |
717 | if (ignore_return) | |
718 | command->value.Case->flags |= CMD_IGNORE_RETURN; | |
719 | exec_result = execute_case_command (command->value.Case); | |
720 | break; | |
721 | ||
722 | case cm_while: | |
723 | if (ignore_return) | |
724 | command->value.While->flags |= CMD_IGNORE_RETURN; | |
725 | exec_result = execute_while_command (command->value.While); | |
726 | break; | |
727 | ||
728 | case cm_until: | |
729 | if (ignore_return) | |
730 | command->value.While->flags |= CMD_IGNORE_RETURN; | |
731 | exec_result = execute_until_command (command->value.While); | |
732 | break; | |
733 | ||
734 | case cm_if: | |
735 | if (ignore_return) | |
736 | command->value.If->flags |= CMD_IGNORE_RETURN; | |
737 | exec_result = execute_if_command (command->value.If); | |
738 | break; | |
739 | ||
740 | case cm_group: | |
741 | ||
742 | /* This code can be executed from either of two paths: an explicit | |
743 | '{}' command, or via a function call. If we are executed via a | |
744 | function call, we have already taken care of the function being | |
745 | executed in the background (down there in execute_simple_command ()), | |
746 | and this command should *not* be marked as asynchronous. If we | |
747 | are executing a regular '{}' group command, and asynchronous == 1, | |
748 | we must want to execute the whole command in the background, so we | |
749 | need a subshell, and we want the stuff executed in that subshell | |
750 | (this group command) to be executed in the foreground of that | |
751 | subshell (i.e. there will not be *another* subshell forked). | |
752 | ||
753 | What we do is to force a subshell if asynchronous, and then call | |
754 | execute_command_internal again with asynchronous still set to 1, | |
755 | but with the original group command, so the printed command will | |
756 | look right. | |
757 | ||
758 | The code above that handles forking off subshells will note that | |
759 | both subshell and async are on, and turn off async in the child | |
760 | after forking the subshell (but leave async set in the parent, so | |
761 | the normal call to describe_pid is made). This turning off | |
762 | async is *crucial*; if it is not done, this will fall into an | |
763 | infinite loop of executions through this spot in subshell after | |
764 | subshell until the process limit is exhausted. */ | |
765 | ||
766 | if (asynchronous) | |
767 | { | |
768 | command->flags |= CMD_FORCE_SUBSHELL; | |
769 | exec_result = | |
770 | execute_command_internal (command, 1, pipe_in, pipe_out, | |
771 | fds_to_close); | |
772 | } | |
773 | else | |
774 | { | |
775 | if (ignore_return && command->value.Group->command) | |
776 | command->value.Group->command->flags |= CMD_IGNORE_RETURN; | |
777 | exec_result = | |
778 | execute_command_internal (command->value.Group->command, | |
779 | asynchronous, pipe_in, pipe_out, | |
780 | fds_to_close); | |
781 | } | |
782 | break; | |
783 | ||
ccc6cda3 JA |
784 | case cm_connection: |
785 | exec_result = execute_connection (command, asynchronous, | |
786 | pipe_in, pipe_out, fds_to_close); | |
787 | break; | |
726f6388 | 788 | |
cce855bc JA |
789 | #if defined (DPAREN_ARITHMETIC) |
790 | case cm_arith: | |
791 | if (ignore_return) | |
792 | command->value.Arith->flags |= CMD_IGNORE_RETURN; | |
793 | exec_result = execute_arith_command (command->value.Arith); | |
794 | break; | |
795 | #endif | |
796 | ||
797 | #if defined (COND_COMMAND) | |
798 | case cm_cond: | |
799 | if (ignore_return) | |
800 | command->value.Cond->flags |= CMD_IGNORE_RETURN; | |
801 | exec_result = execute_cond_command (command->value.Cond); | |
802 | break; | |
803 | #endif | |
804 | ||
ccc6cda3 JA |
805 | case cm_function_def: |
806 | exec_result = execute_intern_function (command->value.Function_def->name, | |
807 | command->value.Function_def->command); | |
808 | break; | |
726f6388 | 809 | |
ccc6cda3 | 810 | default: |
b72432fd | 811 | command_error ("execute_command", CMDERR_BADTYPE, command->type, 0); |
ccc6cda3 | 812 | } |
726f6388 | 813 | |
ccc6cda3 JA |
814 | if (my_undo_list) |
815 | { | |
816 | do_redirections (my_undo_list, 1, 0, 0); | |
817 | dispose_redirects (my_undo_list); | |
818 | } | |
726f6388 | 819 | |
ccc6cda3 JA |
820 | if (exec_undo_list) |
821 | dispose_redirects (exec_undo_list); | |
726f6388 | 822 | |
ccc6cda3 JA |
823 | if (my_undo_list || exec_undo_list) |
824 | discard_unwind_frame ("loop_redirections"); | |
726f6388 | 825 | |
ccc6cda3 JA |
826 | /* Invert the return value if we have to */ |
827 | if (invert) | |
828 | exec_result = (exec_result == EXECUTION_SUCCESS) | |
829 | ? EXECUTION_FAILURE | |
830 | : EXECUTION_SUCCESS; | |
726f6388 | 831 | |
ccc6cda3 JA |
832 | last_command_exit_value = exec_result; |
833 | run_pending_traps (); | |
834 | if (running_trap == 0) | |
835 | currently_executing_command = (COMMAND *)NULL; | |
836 | return (last_command_exit_value); | |
837 | } | |
726f6388 | 838 | |
ccc6cda3 | 839 | #if defined (COMMAND_TIMING) |
726f6388 | 840 | |
bb70624e | 841 | #if defined (HAVE_GETRUSAGE) && defined (HAVE_GETTIMEOFDAY) |
f73dda09 JA |
842 | extern struct timeval *difftimeval __P((struct timeval *, struct timeval *, struct timeval *)); |
843 | extern struct timeval *addtimeval __P((struct timeval *, struct timeval *, struct timeval *)); | |
844 | extern int timeval_to_cpu __P((struct timeval *, struct timeval *, struct timeval *)); | |
bb70624e | 845 | #endif |
726f6388 | 846 | |
ccc6cda3 JA |
847 | #define POSIX_TIMEFORMAT "real %2R\nuser %2U\nsys %2S" |
848 | #define BASH_TIMEFORMAT "\nreal\t%3lR\nuser\t%3lU\nsys\t%3lS" | |
726f6388 | 849 | |
ccc6cda3 | 850 | static int precs[] = { 0, 100, 10, 1 }; |
726f6388 | 851 | |
ccc6cda3 JA |
852 | /* Expand one `%'-prefixed escape sequence from a time format string. */ |
853 | static int | |
854 | mkfmt (buf, prec, lng, sec, sec_fraction) | |
855 | char *buf; | |
856 | int prec, lng; | |
f73dda09 | 857 | time_t sec; |
ccc6cda3 JA |
858 | int sec_fraction; |
859 | { | |
f73dda09 JA |
860 | time_t min; |
861 | char abuf[INT_STRLEN_BOUND(time_t) + 1]; | |
ccc6cda3 | 862 | int ind, aind; |
726f6388 | 863 | |
ccc6cda3 | 864 | ind = 0; |
f73dda09 | 865 | abuf[sizeof(abuf) - 1] = '\0'; |
726f6388 | 866 | |
ccc6cda3 JA |
867 | /* If LNG is non-zero, we want to decompose SEC into minutes and seconds. */ |
868 | if (lng) | |
869 | { | |
870 | min = sec / 60; | |
871 | sec %= 60; | |
f73dda09 | 872 | aind = sizeof(abuf) - 2; |
ccc6cda3 JA |
873 | do |
874 | abuf[aind--] = (min % 10) + '0'; | |
875 | while (min /= 10); | |
876 | aind++; | |
877 | while (abuf[aind]) | |
cce855bc | 878 | buf[ind++] = abuf[aind++]; |
ccc6cda3 JA |
879 | buf[ind++] = 'm'; |
880 | } | |
726f6388 | 881 | |
ccc6cda3 | 882 | /* Now add the seconds. */ |
f73dda09 | 883 | aind = sizeof (abuf) - 2; |
ccc6cda3 JA |
884 | do |
885 | abuf[aind--] = (sec % 10) + '0'; | |
886 | while (sec /= 10); | |
887 | aind++; | |
888 | while (abuf[aind]) | |
889 | buf[ind++] = abuf[aind++]; | |
890 | ||
891 | /* We want to add a decimal point and PREC places after it if PREC is | |
892 | nonzero. PREC is not greater than 3. SEC_FRACTION is between 0 | |
893 | and 999. */ | |
894 | if (prec != 0) | |
895 | { | |
896 | buf[ind++] = '.'; | |
897 | for (aind = 1; aind <= prec; aind++) | |
898 | { | |
899 | buf[ind++] = (sec_fraction / precs[aind]) + '0'; | |
900 | sec_fraction %= precs[aind]; | |
901 | } | |
902 | } | |
726f6388 | 903 | |
ccc6cda3 JA |
904 | if (lng) |
905 | buf[ind++] = 's'; | |
906 | buf[ind] = '\0'; | |
726f6388 | 907 | |
ccc6cda3 JA |
908 | return (ind); |
909 | } | |
726f6388 | 910 | |
ccc6cda3 JA |
911 | /* Interpret the format string FORMAT, interpolating the following escape |
912 | sequences: | |
7117c2d2 | 913 | %[prec][l][RUS] |
ccc6cda3 JA |
914 | |
915 | where the optional `prec' is a precision, meaning the number of | |
916 | characters after the decimal point, the optional `l' means to format | |
917 | using minutes and seconds (MMmNN[.FF]s), like the `times' builtin', | |
918 | and the last character is one of | |
919 | ||
7117c2d2 JA |
920 | R number of seconds of `real' time |
921 | U number of seconds of `user' time | |
922 | S number of seconds of `system' time | |
ccc6cda3 JA |
923 | |
924 | An occurrence of `%%' in the format string is translated to a `%'. The | |
925 | result is printed to FP, a pointer to a FILE. The other variables are | |
926 | the seconds and thousandths of a second of real, user, and system time, | |
927 | resectively. */ | |
928 | static void | |
929 | print_formatted_time (fp, format, rs, rsf, us, usf, ss, ssf, cpu) | |
930 | FILE *fp; | |
931 | char *format; | |
f73dda09 JA |
932 | time_t rs; |
933 | int rsf; | |
934 | time_t us; | |
935 | int usf; | |
936 | time_t ss; | |
937 | int ssf, cpu; | |
ccc6cda3 JA |
938 | { |
939 | int prec, lng, len; | |
f73dda09 JA |
940 | char *str, *s, ts[INT_STRLEN_BOUND (time_t) + sizeof ("mSS.FFFF")]; |
941 | time_t sum; | |
e8ce775d | 942 | int sum_frac; |
ccc6cda3 | 943 | int sindex, ssize; |
726f6388 | 944 | |
ccc6cda3 JA |
945 | len = strlen (format); |
946 | ssize = (len + 64) - (len % 64); | |
f73dda09 | 947 | str = (char *)xmalloc (ssize); |
ccc6cda3 JA |
948 | sindex = 0; |
949 | ||
950 | for (s = format; *s; s++) | |
951 | { | |
952 | if (*s != '%' || s[1] == '\0') | |
cce855bc JA |
953 | { |
954 | RESIZE_MALLOCED_BUFFER (str, sindex, 1, ssize, 64); | |
955 | str[sindex++] = *s; | |
956 | } | |
ccc6cda3 | 957 | else if (s[1] == '%') |
cce855bc JA |
958 | { |
959 | s++; | |
960 | RESIZE_MALLOCED_BUFFER (str, sindex, 1, ssize, 64); | |
961 | str[sindex++] = *s; | |
962 | } | |
ccc6cda3 JA |
963 | else if (s[1] == 'P') |
964 | { | |
965 | s++; | |
966 | if (cpu > 10000) | |
967 | cpu = 10000; | |
968 | sum = cpu / 100; | |
969 | sum_frac = (cpu % 100) * 10; | |
970 | len = mkfmt (ts, 2, 0, sum, sum_frac); | |
971 | RESIZE_MALLOCED_BUFFER (str, sindex, len, ssize, 64); | |
972 | strcpy (str + sindex, ts); | |
973 | sindex += len; | |
974 | } | |
975 | else | |
976 | { | |
977 | prec = 3; /* default is three places past the decimal point. */ | |
978 | lng = 0; /* default is to not use minutes or append `s' */ | |
979 | s++; | |
f73dda09 | 980 | if (DIGIT (*s)) /* `precision' */ |
726f6388 | 981 | { |
ccc6cda3 JA |
982 | prec = *s++ - '0'; |
983 | if (prec > 3) prec = 3; | |
726f6388 | 984 | } |
ccc6cda3 JA |
985 | if (*s == 'l') /* `length extender' */ |
986 | { | |
987 | lng = 1; | |
988 | s++; | |
989 | } | |
990 | if (*s == 'R' || *s == 'E') | |
991 | len = mkfmt (ts, prec, lng, rs, rsf); | |
992 | else if (*s == 'U') | |
993 | len = mkfmt (ts, prec, lng, us, usf); | |
994 | else if (*s == 'S') | |
995 | len = mkfmt (ts, prec, lng, ss, ssf); | |
996 | else | |
997 | { | |
998 | internal_error ("bad format character in time format: %c", *s); | |
999 | free (str); | |
1000 | return; | |
1001 | } | |
1002 | RESIZE_MALLOCED_BUFFER (str, sindex, len, ssize, 64); | |
1003 | strcpy (str + sindex, ts); | |
1004 | sindex += len; | |
1005 | } | |
1006 | } | |
1007 | ||
1008 | str[sindex] = '\0'; | |
1009 | fprintf (fp, "%s\n", str); | |
1010 | fflush (fp); | |
1011 | ||
1012 | free (str); | |
1013 | } | |
1014 | ||
1015 | static int | |
1016 | time_command (command, asynchronous, pipe_in, pipe_out, fds_to_close) | |
1017 | COMMAND *command; | |
1018 | int asynchronous, pipe_in, pipe_out; | |
1019 | struct fd_bitmap *fds_to_close; | |
1020 | { | |
d166f048 | 1021 | int rv, posix_time, old_flags; |
f73dda09 | 1022 | time_t rs, us, ss; |
ccc6cda3 JA |
1023 | int rsf, usf, ssf; |
1024 | int cpu; | |
1025 | char *time_format; | |
1026 | ||
1027 | #if defined (HAVE_GETRUSAGE) && defined (HAVE_GETTIMEOFDAY) | |
1028 | struct timeval real, user, sys; | |
1029 | struct timeval before, after; | |
1030 | struct timezone dtz; | |
1031 | struct rusage selfb, selfa, kidsb, kidsa; /* a = after, b = before */ | |
1032 | #else | |
1033 | # if defined (HAVE_TIMES) | |
1034 | clock_t tbefore, tafter, real, user, sys; | |
1035 | struct tms before, after; | |
1036 | # endif | |
1037 | #endif | |
1038 | ||
1039 | #if defined (HAVE_GETRUSAGE) && defined (HAVE_GETTIMEOFDAY) | |
1040 | gettimeofday (&before, &dtz); | |
1041 | getrusage (RUSAGE_SELF, &selfb); | |
1042 | getrusage (RUSAGE_CHILDREN, &kidsb); | |
1043 | #else | |
1044 | # if defined (HAVE_TIMES) | |
1045 | tbefore = times (&before); | |
1046 | # endif | |
1047 | #endif | |
1048 | ||
1049 | posix_time = (command->flags & CMD_TIME_POSIX); | |
1050 | ||
d166f048 | 1051 | old_flags = command->flags; |
ccc6cda3 JA |
1052 | command->flags &= ~(CMD_TIME_PIPELINE|CMD_TIME_POSIX); |
1053 | rv = execute_command_internal (command, asynchronous, pipe_in, pipe_out, fds_to_close); | |
d166f048 | 1054 | command->flags = old_flags; |
ccc6cda3 | 1055 | |
f73dda09 | 1056 | rs = us = ss = 0; |
cce855bc JA |
1057 | rsf = usf = ssf = cpu = 0; |
1058 | ||
ccc6cda3 JA |
1059 | #if defined (HAVE_GETRUSAGE) && defined (HAVE_GETTIMEOFDAY) |
1060 | gettimeofday (&after, &dtz); | |
1061 | getrusage (RUSAGE_SELF, &selfa); | |
1062 | getrusage (RUSAGE_CHILDREN, &kidsa); | |
1063 | ||
1064 | difftimeval (&real, &before, &after); | |
1065 | timeval_to_secs (&real, &rs, &rsf); | |
1066 | ||
1067 | addtimeval (&user, difftimeval(&after, &selfb.ru_utime, &selfa.ru_utime), | |
1068 | difftimeval(&before, &kidsb.ru_utime, &kidsa.ru_utime)); | |
1069 | timeval_to_secs (&user, &us, &usf); | |
1070 | ||
1071 | addtimeval (&sys, difftimeval(&after, &selfb.ru_stime, &selfa.ru_stime), | |
1072 | difftimeval(&before, &kidsb.ru_stime, &kidsa.ru_stime)); | |
1073 | timeval_to_secs (&sys, &ss, &ssf); | |
1074 | ||
1075 | cpu = timeval_to_cpu (&real, &user, &sys); | |
1076 | #else | |
1077 | # if defined (HAVE_TIMES) | |
1078 | tafter = times (&after); | |
1079 | ||
1080 | real = tafter - tbefore; | |
1081 | clock_t_to_secs (real, &rs, &rsf); | |
1082 | ||
1083 | user = (after.tms_utime - before.tms_utime) + (after.tms_cutime - before.tms_cutime); | |
1084 | clock_t_to_secs (user, &us, &usf); | |
1085 | ||
1086 | sys = (after.tms_stime - before.tms_stime) + (after.tms_cstime - before.tms_cstime); | |
1087 | clock_t_to_secs (sys, &ss, &ssf); | |
1088 | ||
d166f048 | 1089 | cpu = (real == 0) ? 0 : ((user + sys) * 10000) / real; |
ccc6cda3 JA |
1090 | |
1091 | # else | |
f73dda09 | 1092 | rs = us = ss = 0; |
ccc6cda3 JA |
1093 | rsf = usf = ssf = cpu = 0; |
1094 | # endif | |
1095 | #endif | |
1096 | ||
1097 | if (posix_time) | |
1098 | time_format = POSIX_TIMEFORMAT; | |
1099 | else if ((time_format = get_string_value ("TIMEFORMAT")) == 0) | |
1100 | time_format = BASH_TIMEFORMAT; | |
1101 | ||
1102 | if (time_format && *time_format) | |
1103 | print_formatted_time (stderr, time_format, rs, rsf, us, usf, ss, ssf, cpu); | |
1104 | ||
1105 | return rv; | |
1106 | } | |
1107 | #endif /* COMMAND_TIMING */ | |
1108 | ||
bb70624e | 1109 | /* Execute a command that's supposed to be in a subshell. This must be |
28ef6c31 JA |
1110 | called after make_child and we must be running in the child process. |
1111 | The caller will return or exit() immediately with the value this returns. */ | |
bb70624e JA |
1112 | static int |
1113 | execute_in_subshell (command, asynchronous, pipe_in, pipe_out, fds_to_close) | |
1114 | COMMAND *command; | |
1115 | int asynchronous; | |
1116 | int pipe_in, pipe_out; | |
1117 | struct fd_bitmap *fds_to_close; | |
1118 | { | |
28ef6c31 JA |
1119 | int user_subshell, return_code, function_value, should_redir_stdin, invert; |
1120 | int ois; | |
bb70624e JA |
1121 | COMMAND *tcom; |
1122 | ||
f73dda09 JA |
1123 | USE_VAR(user_subshell); |
1124 | USE_VAR(invert); | |
1125 | USE_VAR(tcom); | |
1126 | USE_VAR(asynchronous); | |
1127 | ||
bb70624e JA |
1128 | should_redir_stdin = (asynchronous && (command->flags & CMD_STDIN_REDIR) && |
1129 | pipe_in == NO_PIPE && | |
1130 | stdin_redirects (command->redirects) == 0); | |
1131 | ||
28ef6c31 | 1132 | invert = (command->flags & CMD_INVERT_RETURN) != 0; |
bb70624e | 1133 | user_subshell = command->type == cm_subshell || ((command->flags & CMD_WANT_SUBSHELL) != 0); |
28ef6c31 | 1134 | |
bb70624e JA |
1135 | command->flags &= ~(CMD_FORCE_SUBSHELL | CMD_WANT_SUBSHELL | CMD_INVERT_RETURN); |
1136 | ||
1137 | /* If a command is asynchronous in a subshell (like ( foo ) & or | |
1138 | the special case of an asynchronous GROUP command where the | |
1139 | the subshell bit is turned on down in case cm_group: below), | |
1140 | turn off `asynchronous', so that two subshells aren't spawned. | |
1141 | ||
1142 | This seems semantically correct to me. For example, | |
1143 | ( foo ) & seems to say ``do the command `foo' in a subshell | |
1144 | environment, but don't wait for that subshell to finish'', | |
1145 | and "{ foo ; bar ; } &" seems to me to be like functions or | |
1146 | builtins in the background, which executed in a subshell | |
1147 | environment. I just don't see the need to fork two subshells. */ | |
1148 | ||
1149 | /* Don't fork again, we are already in a subshell. A `doubly | |
1150 | async' shell is not interactive, however. */ | |
1151 | if (asynchronous) | |
1152 | { | |
1153 | #if defined (JOB_CONTROL) | |
1154 | /* If a construct like ( exec xxx yyy ) & is given while job | |
1155 | control is active, we want to prevent exec from putting the | |
1156 | subshell back into the original process group, carefully | |
1157 | undoing all the work we just did in make_child. */ | |
1158 | original_pgrp = -1; | |
1159 | #endif /* JOB_CONTROL */ | |
28ef6c31 | 1160 | ois = interactive_shell; |
bb70624e | 1161 | interactive_shell = 0; |
28ef6c31 JA |
1162 | /* This test is to prevent alias expansion by interactive shells that |
1163 | run `(command) &' but to allow scripts that have enabled alias | |
1164 | expansion with `shopt -s expand_alias' to continue to expand | |
1165 | aliases. */ | |
1166 | if (ois != interactive_shell) | |
1167 | expand_aliases = 0; | |
bb70624e JA |
1168 | asynchronous = 0; |
1169 | } | |
1170 | ||
1171 | /* Subshells are neither login nor interactive. */ | |
1172 | login_shell = interactive = 0; | |
1173 | ||
1174 | subshell_environment = user_subshell ? SUBSHELL_PAREN : SUBSHELL_ASYNC; | |
1175 | ||
1176 | reset_terminating_signals (); /* in sig.c */ | |
1177 | /* Cancel traps, in trap.c. */ | |
1178 | restore_original_signals (); | |
1179 | if (asynchronous) | |
1180 | setup_async_signals (); | |
1181 | ||
1182 | #if defined (JOB_CONTROL) | |
1183 | set_sigchld_handler (); | |
1184 | #endif /* JOB_CONTROL */ | |
1185 | ||
1186 | set_sigint_handler (); | |
1187 | ||
1188 | #if defined (JOB_CONTROL) | |
1189 | /* Delete all traces that there were any jobs running. This is | |
1190 | only for subshells. */ | |
1191 | without_job_control (); | |
1192 | #endif /* JOB_CONTROL */ | |
1193 | ||
1194 | if (fds_to_close) | |
1195 | close_fd_bitmap (fds_to_close); | |
1196 | ||
1197 | do_piping (pipe_in, pipe_out); | |
1198 | ||
1199 | /* If this is a user subshell, set a flag if stdin was redirected. | |
1200 | This is used later to decide whether to redirect fd 0 to | |
1201 | /dev/null for async commands in the subshell. This adds more | |
1202 | sh compatibility, but I'm not sure it's the right thing to do. */ | |
1203 | if (user_subshell) | |
1204 | { | |
1205 | stdin_redir = stdin_redirects (command->redirects); | |
1206 | restore_default_signal (0); | |
1207 | } | |
1208 | ||
1209 | /* If this is an asynchronous command (command &), we want to | |
1210 | redirect the standard input from /dev/null in the absence of | |
1211 | any specific redirection involving stdin. */ | |
1212 | if (should_redir_stdin && stdin_redir == 0) | |
1213 | async_redirect_stdin (); | |
1214 | ||
1215 | /* Do redirections, then dispose of them before recursive call. */ | |
1216 | if (command->redirects) | |
1217 | { | |
1218 | if (do_redirections (command->redirects, 1, 0, 0) != 0) | |
28ef6c31 | 1219 | exit (invert ? EXECUTION_SUCCESS : EXECUTION_FAILURE); |
bb70624e JA |
1220 | |
1221 | dispose_redirects (command->redirects); | |
1222 | command->redirects = (REDIRECT *)NULL; | |
1223 | } | |
1224 | ||
1225 | tcom = (command->type == cm_subshell) ? command->value.Subshell->command : command; | |
1226 | ||
f73dda09 JA |
1227 | /* Make sure the subshell inherits any CMD_IGNORE_RETURN flag. */ |
1228 | if ((command->flags & CMD_IGNORE_RETURN) && tcom != command) | |
1229 | tcom->flags |= CMD_IGNORE_RETURN; | |
1230 | ||
bb70624e JA |
1231 | /* If this is a simple command, tell execute_disk_command that it |
1232 | might be able to get away without forking and simply exec. | |
1233 | This means things like ( sleep 10 ) will only cause one fork. | |
28ef6c31 JA |
1234 | If we're timing the command or inverting its return value, however, |
1235 | we cannot do this optimization. */ | |
bb70624e | 1236 | if (user_subshell && (tcom->type == cm_simple || tcom->type == cm_subshell) && |
28ef6c31 JA |
1237 | ((tcom->flags & CMD_TIME_PIPELINE) == 0) && |
1238 | ((tcom->flags & CMD_INVERT_RETURN) == 0)) | |
bb70624e JA |
1239 | { |
1240 | tcom->flags |= CMD_NO_FORK; | |
1241 | if (tcom->type == cm_simple) | |
1242 | tcom->value.Simple->flags |= CMD_NO_FORK; | |
1243 | } | |
1244 | ||
28ef6c31 JA |
1245 | invert = (tcom->flags & CMD_INVERT_RETURN) != 0; |
1246 | tcom->flags &= ~CMD_INVERT_RETURN; | |
1247 | ||
bb70624e JA |
1248 | /* If we're inside a function while executing this subshell, we |
1249 | need to handle a possible `return'. */ | |
1250 | function_value = 0; | |
1251 | if (return_catch_flag) | |
1252 | function_value = setjmp (return_catch); | |
1253 | ||
1254 | if (function_value) | |
1255 | return_code = return_catch_value; | |
1256 | else | |
1257 | return_code = execute_command_internal | |
1258 | (tcom, asynchronous, NO_PIPE, NO_PIPE, fds_to_close); | |
1259 | ||
28ef6c31 JA |
1260 | /* If we are asked to, invert the return value. */ |
1261 | if (invert) | |
1262 | return_code = (return_code == EXECUTION_SUCCESS) ? EXECUTION_FAILURE | |
1263 | : EXECUTION_SUCCESS; | |
1264 | ||
bb70624e JA |
1265 | /* If we were explicitly placed in a subshell with (), we need |
1266 | to do the `shell cleanup' things, such as running traps[0]. */ | |
1267 | if (user_subshell && signal_is_trapped (0)) | |
1268 | { | |
1269 | last_command_exit_value = return_code; | |
1270 | return_code = run_exit_trap (); | |
1271 | } | |
1272 | ||
1273 | return (return_code); | |
1274 | /* NOTREACHED */ | |
1275 | } | |
1276 | ||
ccc6cda3 JA |
1277 | static int |
1278 | execute_pipeline (command, asynchronous, pipe_in, pipe_out, fds_to_close) | |
1279 | COMMAND *command; | |
1280 | int asynchronous, pipe_in, pipe_out; | |
1281 | struct fd_bitmap *fds_to_close; | |
1282 | { | |
1283 | int prev, fildes[2], new_bitmap_size, dummyfd, ignore_return, exec_result; | |
1284 | COMMAND *cmd; | |
1285 | struct fd_bitmap *fd_bitmap; | |
726f6388 JA |
1286 | |
1287 | #if defined (JOB_CONTROL) | |
ccc6cda3 JA |
1288 | sigset_t set, oset; |
1289 | BLOCK_CHILD (set, oset); | |
726f6388 JA |
1290 | #endif /* JOB_CONTROL */ |
1291 | ||
ccc6cda3 | 1292 | ignore_return = (command->flags & CMD_IGNORE_RETURN) != 0; |
726f6388 | 1293 | |
ccc6cda3 JA |
1294 | prev = pipe_in; |
1295 | cmd = command; | |
1296 | ||
1297 | while (cmd && cmd->type == cm_connection && | |
1298 | cmd->value.Connection && cmd->value.Connection->connector == '|') | |
1299 | { | |
1300 | /* Make a pipeline between the two commands. */ | |
1301 | if (pipe (fildes) < 0) | |
1302 | { | |
1303 | sys_error ("pipe error"); | |
726f6388 | 1304 | #if defined (JOB_CONTROL) |
ccc6cda3 JA |
1305 | terminate_current_pipeline (); |
1306 | kill_current_pipeline (); | |
726f6388 | 1307 | #endif /* JOB_CONTROL */ |
ccc6cda3 JA |
1308 | last_command_exit_value = EXECUTION_FAILURE; |
1309 | /* The unwind-protects installed below will take care | |
1310 | of closing all of the open file descriptors. */ | |
1311 | throw_to_top_level (); | |
1312 | return (EXECUTION_FAILURE); /* XXX */ | |
1313 | } | |
1314 | ||
1315 | /* Here is a problem: with the new file close-on-exec | |
1316 | code, the read end of the pipe (fildes[0]) stays open | |
1317 | in the first process, so that process will never get a | |
1318 | SIGPIPE. There is no way to signal the first process | |
1319 | that it should close fildes[0] after forking, so it | |
1320 | remains open. No SIGPIPE is ever sent because there | |
1321 | is still a file descriptor open for reading connected | |
1322 | to the pipe. We take care of that here. This passes | |
1323 | around a bitmap of file descriptors that must be | |
1324 | closed after making a child process in execute_simple_command. */ | |
1325 | ||
1326 | /* We need fd_bitmap to be at least as big as fildes[0]. | |
1327 | If fildes[0] is less than fds_to_close->size, then | |
1328 | use fds_to_close->size. */ | |
1329 | new_bitmap_size = (fildes[0] < fds_to_close->size) | |
1330 | ? fds_to_close->size | |
1331 | : fildes[0] + 8; | |
1332 | ||
1333 | fd_bitmap = new_fd_bitmap (new_bitmap_size); | |
1334 | ||
1335 | /* Now copy the old information into the new bitmap. */ | |
1336 | xbcopy ((char *)fds_to_close->bitmap, (char *)fd_bitmap->bitmap, fds_to_close->size); | |
1337 | ||
1338 | /* And mark the pipe file descriptors to be closed. */ | |
1339 | fd_bitmap->bitmap[fildes[0]] = 1; | |
1340 | ||
1341 | /* In case there are pipe or out-of-processes errors, we | |
cce855bc | 1342 | want all these file descriptors to be closed when |
ccc6cda3 JA |
1343 | unwind-protects are run, and the storage used for the |
1344 | bitmaps freed up. */ | |
1345 | begin_unwind_frame ("pipe-file-descriptors"); | |
1346 | add_unwind_protect (dispose_fd_bitmap, fd_bitmap); | |
1347 | add_unwind_protect (close_fd_bitmap, fd_bitmap); | |
1348 | if (prev >= 0) | |
1349 | add_unwind_protect (close, prev); | |
1350 | dummyfd = fildes[1]; | |
1351 | add_unwind_protect (close, dummyfd); | |
726f6388 JA |
1352 | |
1353 | #if defined (JOB_CONTROL) | |
f73dda09 | 1354 | add_unwind_protect (restore_signal_mask, &oset); |
726f6388 JA |
1355 | #endif /* JOB_CONTROL */ |
1356 | ||
ccc6cda3 JA |
1357 | if (ignore_return && cmd->value.Connection->first) |
1358 | cmd->value.Connection->first->flags |= CMD_IGNORE_RETURN; | |
1359 | execute_command_internal (cmd->value.Connection->first, asynchronous, | |
1360 | prev, fildes[1], fd_bitmap); | |
1361 | ||
1362 | if (prev >= 0) | |
1363 | close (prev); | |
1364 | ||
1365 | prev = fildes[0]; | |
1366 | close (fildes[1]); | |
1367 | ||
1368 | dispose_fd_bitmap (fd_bitmap); | |
1369 | discard_unwind_frame ("pipe-file-descriptors"); | |
726f6388 | 1370 | |
ccc6cda3 JA |
1371 | cmd = cmd->value.Connection->second; |
1372 | } | |
1373 | ||
1374 | /* Now execute the rightmost command in the pipeline. */ | |
1375 | if (ignore_return && cmd) | |
1376 | cmd->flags |= CMD_IGNORE_RETURN; | |
1377 | exec_result = execute_command_internal (cmd, asynchronous, prev, pipe_out, fds_to_close); | |
726f6388 | 1378 | |
ccc6cda3 JA |
1379 | if (prev >= 0) |
1380 | close (prev); | |
726f6388 JA |
1381 | |
1382 | #if defined (JOB_CONTROL) | |
ccc6cda3 | 1383 | UNBLOCK_CHILD (oset); |
726f6388 | 1384 | #endif |
726f6388 | 1385 | |
ccc6cda3 JA |
1386 | return (exec_result); |
1387 | } | |
1388 | ||
1389 | static int | |
1390 | execute_connection (command, asynchronous, pipe_in, pipe_out, fds_to_close) | |
1391 | COMMAND *command; | |
1392 | int asynchronous, pipe_in, pipe_out; | |
1393 | struct fd_bitmap *fds_to_close; | |
1394 | { | |
d166f048 | 1395 | REDIRECT *rp; |
ccc6cda3 JA |
1396 | COMMAND *tc, *second; |
1397 | int ignore_return, exec_result; | |
1398 | ||
1399 | ignore_return = (command->flags & CMD_IGNORE_RETURN) != 0; | |
1400 | ||
1401 | switch (command->value.Connection->connector) | |
1402 | { | |
1403 | /* Do the first command asynchronously. */ | |
1404 | case '&': | |
1405 | tc = command->value.Connection->first; | |
1406 | if (tc == 0) | |
1407 | return (EXECUTION_SUCCESS); | |
1408 | ||
1409 | rp = tc->redirects; | |
1410 | ||
d166f048 | 1411 | if (ignore_return) |
ccc6cda3 | 1412 | tc->flags |= CMD_IGNORE_RETURN; |
d166f048 | 1413 | tc->flags |= CMD_AMPERSAND; |
ccc6cda3 | 1414 | |
f73dda09 JA |
1415 | /* If this shell was compiled without job control support, |
1416 | if we are currently in a subshell via `( xxx )', or if job | |
1417 | control is not active then the standard input for an | |
1418 | asynchronous command is forced to /dev/null. */ | |
ccc6cda3 | 1419 | #if defined (JOB_CONTROL) |
f73dda09 | 1420 | if ((subshell_environment || !job_control) && !stdin_redir) |
ccc6cda3 JA |
1421 | #else |
1422 | if (!stdin_redir) | |
1423 | #endif /* JOB_CONTROL */ | |
7117c2d2 | 1424 | tc->flags |= CMD_STDIN_REDIR; |
ccc6cda3 JA |
1425 | |
1426 | exec_result = execute_command_internal (tc, 1, pipe_in, pipe_out, fds_to_close); | |
1427 | ||
d166f048 | 1428 | if (tc->flags & CMD_STDIN_REDIR) |
7117c2d2 | 1429 | tc->flags &= ~CMD_STDIN_REDIR; |
726f6388 | 1430 | |
ccc6cda3 JA |
1431 | second = command->value.Connection->second; |
1432 | if (second) | |
1433 | { | |
1434 | if (ignore_return) | |
1435 | second->flags |= CMD_IGNORE_RETURN; | |
726f6388 | 1436 | |
ccc6cda3 JA |
1437 | exec_result = execute_command_internal (second, asynchronous, pipe_in, pipe_out, fds_to_close); |
1438 | } | |
726f6388 | 1439 | |
ccc6cda3 | 1440 | break; |
726f6388 | 1441 | |
ccc6cda3 JA |
1442 | /* Just call execute command on both sides. */ |
1443 | case ';': | |
1444 | if (ignore_return) | |
1445 | { | |
1446 | if (command->value.Connection->first) | |
1447 | command->value.Connection->first->flags |= CMD_IGNORE_RETURN; | |
1448 | if (command->value.Connection->second) | |
1449 | command->value.Connection->second->flags |= CMD_IGNORE_RETURN; | |
726f6388 | 1450 | } |
ccc6cda3 JA |
1451 | QUIT; |
1452 | execute_command (command->value.Connection->first); | |
1453 | QUIT; | |
1454 | exec_result = execute_command_internal (command->value.Connection->second, | |
1455 | asynchronous, pipe_in, pipe_out, | |
1456 | fds_to_close); | |
726f6388 JA |
1457 | break; |
1458 | ||
ccc6cda3 JA |
1459 | case '|': |
1460 | exec_result = execute_pipeline (command, asynchronous, pipe_in, pipe_out, fds_to_close); | |
726f6388 JA |
1461 | break; |
1462 | ||
ccc6cda3 JA |
1463 | case AND_AND: |
1464 | case OR_OR: | |
1465 | if (asynchronous) | |
1466 | { | |
1467 | /* If we have something like `a && b &' or `a || b &', run the | |
1468 | && or || stuff in a subshell. Force a subshell and just call | |
1469 | execute_command_internal again. Leave asynchronous on | |
1470 | so that we get a report from the parent shell about the | |
1471 | background job. */ | |
1472 | command->flags |= CMD_FORCE_SUBSHELL; | |
1473 | exec_result = execute_command_internal (command, 1, pipe_in, pipe_out, fds_to_close); | |
1474 | break; | |
1475 | } | |
726f6388 | 1476 | |
ccc6cda3 JA |
1477 | /* Execute the first command. If the result of that is successful |
1478 | and the connector is AND_AND, or the result is not successful | |
1479 | and the connector is OR_OR, then execute the second command, | |
1480 | otherwise return. */ | |
726f6388 | 1481 | |
ccc6cda3 JA |
1482 | if (command->value.Connection->first) |
1483 | command->value.Connection->first->flags |= CMD_IGNORE_RETURN; | |
726f6388 | 1484 | |
ccc6cda3 JA |
1485 | exec_result = execute_command (command->value.Connection->first); |
1486 | QUIT; | |
1487 | if (((command->value.Connection->connector == AND_AND) && | |
1488 | (exec_result == EXECUTION_SUCCESS)) || | |
1489 | ((command->value.Connection->connector == OR_OR) && | |
1490 | (exec_result != EXECUTION_SUCCESS))) | |
1491 | { | |
1492 | if (ignore_return && command->value.Connection->second) | |
1493 | command->value.Connection->second->flags |= CMD_IGNORE_RETURN; | |
726f6388 | 1494 | |
ccc6cda3 JA |
1495 | exec_result = execute_command (command->value.Connection->second); |
1496 | } | |
1497 | break; | |
1498 | ||
1499 | default: | |
b72432fd | 1500 | command_error ("execute_connection", CMDERR_BADCONN, command->value.Connection->connector, 0); |
ccc6cda3 JA |
1501 | jump_to_top_level (DISCARD); |
1502 | exec_result = EXECUTION_FAILURE; | |
726f6388 JA |
1503 | } |
1504 | ||
ccc6cda3 | 1505 | return exec_result; |
726f6388 JA |
1506 | } |
1507 | ||
bb70624e JA |
1508 | #define REAP() \ |
1509 | do \ | |
1510 | { \ | |
1511 | if (!interactive_shell) \ | |
1512 | reap_dead_jobs (); \ | |
1513 | } \ | |
1514 | while (0) | |
726f6388 JA |
1515 | |
1516 | /* Execute a FOR command. The syntax is: FOR word_desc IN word_list; | |
1517 | DO command; DONE */ | |
ccc6cda3 | 1518 | static int |
726f6388 JA |
1519 | execute_for_command (for_command) |
1520 | FOR_COM *for_command; | |
1521 | { | |
726f6388 | 1522 | register WORD_LIST *releaser, *list; |
ccc6cda3 | 1523 | SHELL_VAR *v; |
726f6388 | 1524 | char *identifier; |
ccc6cda3 JA |
1525 | int retval; |
1526 | #if 0 | |
726f6388 | 1527 | SHELL_VAR *old_value = (SHELL_VAR *)NULL; /* Remember the old value of x. */ |
ccc6cda3 | 1528 | #endif |
726f6388 JA |
1529 | |
1530 | if (check_identifier (for_command->name, 1) == 0) | |
ccc6cda3 JA |
1531 | { |
1532 | if (posixly_correct && interactive_shell == 0) | |
cce855bc JA |
1533 | { |
1534 | last_command_exit_value = EX_USAGE; | |
1535 | jump_to_top_level (EXITPROG); | |
1536 | } | |
ccc6cda3 JA |
1537 | return (EXECUTION_FAILURE); |
1538 | } | |
726f6388 JA |
1539 | |
1540 | loop_level++; | |
1541 | identifier = for_command->name->word; | |
1542 | ||
1543 | list = releaser = expand_words_no_vars (for_command->map_list); | |
1544 | ||
1545 | begin_unwind_frame ("for"); | |
1546 | add_unwind_protect (dispose_words, releaser); | |
1547 | ||
ccc6cda3 | 1548 | #if 0 |
726f6388 JA |
1549 | if (lexical_scoping) |
1550 | { | |
1551 | old_value = copy_variable (find_variable (identifier)); | |
1552 | if (old_value) | |
1553 | add_unwind_protect (dispose_variable, old_value); | |
1554 | } | |
ccc6cda3 | 1555 | #endif |
726f6388 JA |
1556 | |
1557 | if (for_command->flags & CMD_IGNORE_RETURN) | |
1558 | for_command->action->flags |= CMD_IGNORE_RETURN; | |
1559 | ||
ccc6cda3 | 1560 | for (retval = EXECUTION_SUCCESS; list; list = list->next) |
726f6388 JA |
1561 | { |
1562 | QUIT; | |
ccc6cda3 JA |
1563 | this_command_name = (char *)NULL; |
1564 | v = bind_variable (identifier, list->word->word); | |
28ef6c31 | 1565 | if (readonly_p (v) || noassign_p (v)) |
ccc6cda3 | 1566 | { |
28ef6c31 | 1567 | if (readonly_p (v) && interactive_shell == 0 && posixly_correct) |
ccc6cda3 JA |
1568 | { |
1569 | last_command_exit_value = EXECUTION_FAILURE; | |
1570 | jump_to_top_level (FORCE_EOF); | |
1571 | } | |
1572 | else | |
1573 | { | |
1574 | run_unwind_frame ("for"); | |
d166f048 | 1575 | loop_level--; |
ccc6cda3 JA |
1576 | return (EXECUTION_FAILURE); |
1577 | } | |
1578 | } | |
1579 | retval = execute_command (for_command->action); | |
726f6388 JA |
1580 | REAP (); |
1581 | QUIT; | |
1582 | ||
1583 | if (breaking) | |
1584 | { | |
ccc6cda3 | 1585 | breaking--; |
726f6388 JA |
1586 | break; |
1587 | } | |
1588 | ||
1589 | if (continuing) | |
1590 | { | |
1591 | continuing--; | |
1592 | if (continuing) | |
1593 | break; | |
1594 | } | |
726f6388 JA |
1595 | } |
1596 | ||
1597 | loop_level--; | |
1598 | ||
ccc6cda3 | 1599 | #if 0 |
726f6388 JA |
1600 | if (lexical_scoping) |
1601 | { | |
1602 | if (!old_value) | |
7117c2d2 | 1603 | unbind_variable (identifier); |
726f6388 JA |
1604 | else |
1605 | { | |
1606 | SHELL_VAR *new_value; | |
1607 | ||
1608 | new_value = bind_variable (identifier, value_cell(old_value)); | |
1609 | new_value->attributes = old_value->attributes; | |
1610 | dispose_variable (old_value); | |
1611 | } | |
1612 | } | |
ccc6cda3 | 1613 | #endif |
726f6388 JA |
1614 | |
1615 | dispose_words (releaser); | |
1616 | discard_unwind_frame ("for"); | |
1617 | return (retval); | |
1618 | } | |
1619 | ||
bb70624e JA |
1620 | #if defined (ARITH_FOR_COMMAND) |
1621 | /* Execute an arithmetic for command. The syntax is | |
1622 | ||
1623 | for (( init ; step ; test )) | |
1624 | do | |
1625 | body | |
1626 | done | |
1627 | ||
1628 | The execution should be exactly equivalent to | |
1629 | ||
1630 | eval \(\( init \)\) | |
1631 | while eval \(\( test \)\) ; do | |
1632 | body; | |
1633 | eval \(\( step \)\) | |
1634 | done | |
1635 | */ | |
7117c2d2 | 1636 | static intmax_t |
bb70624e JA |
1637 | eval_arith_for_expr (l, okp) |
1638 | WORD_LIST *l; | |
1639 | int *okp; | |
1640 | { | |
1641 | WORD_LIST *new; | |
7117c2d2 | 1642 | intmax_t expresult; |
bb70624e JA |
1643 | |
1644 | new = expand_words_no_vars (l); | |
f73dda09 JA |
1645 | if (new) |
1646 | { | |
1647 | if (echo_command_at_execute) | |
1648 | xtrace_print_arith_cmd (new); | |
7117c2d2 JA |
1649 | this_command_name = "(("; /* )) for expression error messages */ |
1650 | if (signal_is_trapped (DEBUG_TRAP) && signal_is_ignored (DEBUG_TRAP) == 0) | |
1651 | run_debug_trap (); | |
f73dda09 JA |
1652 | expresult = evalexp (new->word->word, okp); |
1653 | dispose_words (new); | |
1654 | } | |
1655 | else | |
1656 | { | |
1657 | expresult = 0; | |
1658 | if (okp) | |
1659 | *okp = 1; | |
1660 | } | |
bb70624e JA |
1661 | return (expresult); |
1662 | } | |
1663 | ||
1664 | static int | |
1665 | execute_arith_for_command (arith_for_command) | |
1666 | ARITH_FOR_COM *arith_for_command; | |
1667 | { | |
7117c2d2 JA |
1668 | intmax_t expresult; |
1669 | int expok, body_status, arith_lineno, save_lineno; | |
bb70624e JA |
1670 | |
1671 | body_status = EXECUTION_SUCCESS; | |
1672 | loop_level++; | |
1673 | ||
1674 | if (arith_for_command->flags & CMD_IGNORE_RETURN) | |
1675 | arith_for_command->action->flags |= CMD_IGNORE_RETURN; | |
1676 | ||
1677 | this_command_name = "(("; /* )) for expression error messages */ | |
1678 | ||
7117c2d2 JA |
1679 | /* save the starting line number of the command so we can reset |
1680 | line_number before executing each expression -- for $LINENO | |
1681 | and the DEBUG trap. */ | |
1682 | arith_lineno = arith_for_command->line; | |
1683 | if (variable_context && interactive_shell) | |
1684 | line_number = arith_lineno -= function_line_number; | |
bb70624e JA |
1685 | |
1686 | /* Evaluate the initialization expression. */ | |
1687 | expresult = eval_arith_for_expr (arith_for_command->init, &expok); | |
1688 | if (expok == 0) | |
1689 | return (EXECUTION_FAILURE); | |
1690 | ||
1691 | while (1) | |
1692 | { | |
1693 | /* Evaluate the test expression. */ | |
7117c2d2 JA |
1694 | save_lineno = line_number; |
1695 | line_number = arith_lineno; | |
bb70624e | 1696 | expresult = eval_arith_for_expr (arith_for_command->test, &expok); |
7117c2d2 JA |
1697 | line_number = save_lineno; |
1698 | ||
bb70624e JA |
1699 | if (expok == 0) |
1700 | { | |
1701 | body_status = EXECUTION_FAILURE; | |
1702 | break; | |
1703 | } | |
1704 | REAP (); | |
1705 | if (expresult == 0) | |
28ef6c31 | 1706 | break; |
bb70624e JA |
1707 | |
1708 | /* Execute the body of the arithmetic for command. */ | |
1709 | QUIT; | |
1710 | body_status = execute_command (arith_for_command->action); | |
1711 | QUIT; | |
1712 | ||
1713 | /* Handle any `break' or `continue' commands executed by the body. */ | |
1714 | if (breaking) | |
1715 | { | |
1716 | breaking--; | |
1717 | break; | |
1718 | } | |
1719 | ||
1720 | if (continuing) | |
1721 | { | |
1722 | continuing--; | |
1723 | if (continuing) | |
1724 | break; | |
1725 | } | |
1726 | ||
1727 | /* Evaluate the step expression. */ | |
7117c2d2 JA |
1728 | save_lineno = line_number; |
1729 | line_number = arith_lineno; | |
bb70624e | 1730 | expresult = eval_arith_for_expr (arith_for_command->step, &expok); |
7117c2d2 JA |
1731 | line_number = save_lineno; |
1732 | ||
bb70624e JA |
1733 | if (expok == 0) |
1734 | { | |
1735 | body_status = EXECUTION_FAILURE; | |
1736 | break; | |
1737 | } | |
1738 | } | |
1739 | ||
1740 | loop_level--; | |
1741 | return (body_status); | |
1742 | } | |
1743 | #endif | |
1744 | ||
726f6388 JA |
1745 | #if defined (SELECT_COMMAND) |
1746 | static int LINES, COLS, tabsize; | |
1747 | ||
1748 | #define RP_SPACE ") " | |
1749 | #define RP_SPACE_LEN 2 | |
1750 | ||
1751 | /* XXX - does not handle numbers > 1000000 at all. */ | |
1752 | #define NUMBER_LEN(s) \ | |
1753 | ((s < 10) ? 1 \ | |
1754 | : ((s < 100) ? 2 \ | |
1755 | : ((s < 1000) ? 3 \ | |
1756 | : ((s < 10000) ? 4 \ | |
1757 | : ((s < 100000) ? 5 \ | |
1758 | : 6))))) | |
1759 | ||
1760 | static int | |
1761 | print_index_and_element (len, ind, list) | |
1762 | int len, ind; | |
1763 | WORD_LIST *list; | |
1764 | { | |
1765 | register WORD_LIST *l; | |
1766 | register int i; | |
1767 | ||
1768 | if (list == 0) | |
1769 | return (0); | |
ccc6cda3 JA |
1770 | for (i = ind, l = list; l && --i; l = l->next) |
1771 | ; | |
726f6388 JA |
1772 | fprintf (stderr, "%*d%s%s", len, ind, RP_SPACE, l->word->word); |
1773 | return (STRLEN (l->word->word)); | |
1774 | } | |
1775 | ||
1776 | static void | |
1777 | indent (from, to) | |
1778 | int from, to; | |
1779 | { | |
1780 | while (from < to) | |
1781 | { | |
1782 | if ((to / tabsize) > (from / tabsize)) | |
1783 | { | |
1784 | putc ('\t', stderr); | |
1785 | from += tabsize - from % tabsize; | |
1786 | } | |
1787 | else | |
1788 | { | |
1789 | putc (' ', stderr); | |
1790 | from++; | |
1791 | } | |
1792 | } | |
1793 | } | |
1794 | ||
1795 | static void | |
1796 | print_select_list (list, list_len, max_elem_len, indices_len) | |
1797 | WORD_LIST *list; | |
1798 | int list_len, max_elem_len, indices_len; | |
1799 | { | |
1800 | int ind, row, elem_len, pos, cols, rows; | |
1801 | int first_column_indices_len, other_indices_len; | |
1802 | ||
1803 | if (list == 0) | |
1804 | { | |
1805 | putc ('\n', stderr); | |
1806 | return; | |
1807 | } | |
1808 | ||
ccc6cda3 | 1809 | cols = max_elem_len ? COLS / max_elem_len : 1; |
726f6388 JA |
1810 | if (cols == 0) |
1811 | cols = 1; | |
1812 | rows = list_len ? list_len / cols + (list_len % cols != 0) : 1; | |
1813 | cols = list_len ? list_len / rows + (list_len % rows != 0) : 1; | |
1814 | ||
1815 | if (rows == 1) | |
1816 | { | |
1817 | rows = cols; | |
1818 | cols = 1; | |
1819 | } | |
1820 | ||
1821 | first_column_indices_len = NUMBER_LEN (rows); | |
1822 | other_indices_len = indices_len; | |
1823 | ||
1824 | for (row = 0; row < rows; row++) | |
1825 | { | |
1826 | ind = row; | |
1827 | pos = 0; | |
1828 | while (1) | |
1829 | { | |
1830 | indices_len = (pos == 0) ? first_column_indices_len : other_indices_len; | |
1831 | elem_len = print_index_and_element (indices_len, ind + 1, list); | |
1832 | elem_len += indices_len + RP_SPACE_LEN; | |
1833 | ind += rows; | |
1834 | if (ind >= list_len) | |
1835 | break; | |
1836 | indent (pos + elem_len, pos + max_elem_len); | |
1837 | pos += max_elem_len; | |
1838 | } | |
1839 | putc ('\n', stderr); | |
1840 | } | |
1841 | } | |
1842 | ||
1843 | /* Print the elements of LIST, one per line, preceded by an index from 1 to | |
1844 | LIST_LEN. Then display PROMPT and wait for the user to enter a number. | |
1845 | If the number is between 1 and LIST_LEN, return that selection. If EOF | |
e8ce775d JA |
1846 | is read, return a null string. If a blank line is entered, or an invalid |
1847 | number is entered, the loop is executed again. */ | |
726f6388 | 1848 | static char * |
7117c2d2 | 1849 | select_query (list, list_len, prompt, print_menu) |
726f6388 JA |
1850 | WORD_LIST *list; |
1851 | int list_len; | |
1852 | char *prompt; | |
7117c2d2 | 1853 | int print_menu; |
726f6388 | 1854 | { |
e8ce775d | 1855 | int max_elem_len, indices_len, len; |
7117c2d2 | 1856 | intmax_t reply; |
726f6388 JA |
1857 | WORD_LIST *l; |
1858 | char *repl_string, *t; | |
1859 | ||
1860 | t = get_string_value ("LINES"); | |
1861 | LINES = (t && *t) ? atoi (t) : 24; | |
1862 | t = get_string_value ("COLUMNS"); | |
1863 | COLS = (t && *t) ? atoi (t) : 80; | |
1864 | ||
1865 | #if 0 | |
1866 | t = get_string_value ("TABSIZE"); | |
1867 | tabsize = (t && *t) ? atoi (t) : 8; | |
1868 | if (tabsize <= 0) | |
1869 | tabsize = 8; | |
1870 | #else | |
1871 | tabsize = 8; | |
1872 | #endif | |
1873 | ||
1874 | max_elem_len = 0; | |
1875 | for (l = list; l; l = l->next) | |
1876 | { | |
1877 | len = STRLEN (l->word->word); | |
1878 | if (len > max_elem_len) | |
cce855bc | 1879 | max_elem_len = len; |
726f6388 JA |
1880 | } |
1881 | indices_len = NUMBER_LEN (list_len); | |
1882 | max_elem_len += indices_len + RP_SPACE_LEN + 2; | |
1883 | ||
1884 | while (1) | |
1885 | { | |
7117c2d2 JA |
1886 | if (print_menu) |
1887 | print_select_list (list, list_len, max_elem_len, indices_len); | |
ccc6cda3 JA |
1888 | fprintf (stderr, "%s", prompt); |
1889 | fflush (stderr); | |
726f6388 JA |
1890 | QUIT; |
1891 | ||
1892 | if (read_builtin ((WORD_LIST *)NULL) == EXECUTION_FAILURE) | |
1893 | { | |
1894 | putchar ('\n'); | |
1895 | return ((char *)NULL); | |
1896 | } | |
1897 | repl_string = get_string_value ("REPLY"); | |
1898 | if (*repl_string == 0) | |
7117c2d2 JA |
1899 | { |
1900 | print_menu = 1; | |
1901 | continue; | |
1902 | } | |
e8ce775d | 1903 | if (legal_number (repl_string, &reply) == 0) |
cce855bc | 1904 | return ""; |
726f6388 JA |
1905 | if (reply < 1 || reply > list_len) |
1906 | return ""; | |
1907 | ||
ccc6cda3 JA |
1908 | for (l = list; l && --reply; l = l->next) |
1909 | ; | |
726f6388 JA |
1910 | return (l->word->word); |
1911 | } | |
1912 | } | |
1913 | ||
1914 | /* Execute a SELECT command. The syntax is: | |
1915 | SELECT word IN list DO command_list DONE | |
1916 | Only `break' or `return' in command_list will terminate | |
1917 | the command. */ | |
ccc6cda3 | 1918 | static int |
726f6388 JA |
1919 | execute_select_command (select_command) |
1920 | SELECT_COM *select_command; | |
1921 | { | |
1922 | WORD_LIST *releaser, *list; | |
ccc6cda3 | 1923 | SHELL_VAR *v; |
726f6388 | 1924 | char *identifier, *ps3_prompt, *selection; |
7117c2d2 JA |
1925 | int retval, list_len, show_menu; |
1926 | ||
726f6388 JA |
1927 | if (check_identifier (select_command->name, 1) == 0) |
1928 | return (EXECUTION_FAILURE); | |
1929 | ||
1930 | loop_level++; | |
1931 | identifier = select_command->name->word; | |
1932 | ||
1933 | /* command and arithmetic substitution, parameter and variable expansion, | |
1934 | word splitting, pathname expansion, and quote removal. */ | |
1935 | list = releaser = expand_words_no_vars (select_command->map_list); | |
1936 | list_len = list_length (list); | |
1937 | if (list == 0 || list_len == 0) | |
1938 | { | |
1939 | if (list) | |
1940 | dispose_words (list); | |
1941 | return (EXECUTION_SUCCESS); | |
1942 | } | |
1943 | ||
1944 | begin_unwind_frame ("select"); | |
1945 | add_unwind_protect (dispose_words, releaser); | |
1946 | ||
726f6388 JA |
1947 | if (select_command->flags & CMD_IGNORE_RETURN) |
1948 | select_command->action->flags |= CMD_IGNORE_RETURN; | |
1949 | ||
ccc6cda3 | 1950 | retval = EXECUTION_SUCCESS; |
7117c2d2 | 1951 | show_menu = 1; |
ccc6cda3 | 1952 | |
726f6388 JA |
1953 | while (1) |
1954 | { | |
1955 | ps3_prompt = get_string_value ("PS3"); | |
ccc6cda3 | 1956 | if (ps3_prompt == 0) |
726f6388 JA |
1957 | ps3_prompt = "#? "; |
1958 | ||
1959 | QUIT; | |
7117c2d2 | 1960 | selection = select_query (list, list_len, ps3_prompt, show_menu); |
726f6388 JA |
1961 | QUIT; |
1962 | if (selection == 0) | |
7117c2d2 JA |
1963 | { |
1964 | /* select_query returns EXECUTION_FAILURE if the read builtin | |
1965 | fails, so we want to return failure in this case. */ | |
1966 | retval = EXECUTION_FAILURE; | |
1967 | break; | |
1968 | } | |
ccc6cda3 JA |
1969 | |
1970 | v = bind_variable (identifier, selection); | |
28ef6c31 | 1971 | if (readonly_p (v) || noassign_p (v)) |
ccc6cda3 | 1972 | { |
28ef6c31 | 1973 | if (readonly_p (v) && interactive_shell == 0 && posixly_correct) |
ccc6cda3 JA |
1974 | { |
1975 | last_command_exit_value = EXECUTION_FAILURE; | |
1976 | jump_to_top_level (FORCE_EOF); | |
1977 | } | |
1978 | else | |
1979 | { | |
1980 | run_unwind_frame ("select"); | |
1981 | return (EXECUTION_FAILURE); | |
1982 | } | |
1983 | } | |
726f6388 | 1984 | |
f73dda09 | 1985 | retval = execute_command (select_command->action); |
726f6388 JA |
1986 | |
1987 | REAP (); | |
1988 | QUIT; | |
1989 | ||
1990 | if (breaking) | |
1991 | { | |
1992 | breaking--; | |
1993 | break; | |
1994 | } | |
bb70624e JA |
1995 | |
1996 | if (continuing) | |
1997 | { | |
1998 | continuing--; | |
1999 | if (continuing) | |
2000 | break; | |
2001 | } | |
7117c2d2 JA |
2002 | |
2003 | #if defined (KSH_COMPATIBLE_SELECT) | |
2004 | show_menu = 0; | |
2005 | selection = get_string_value ("REPLY"); | |
2006 | if (selection && *selection == '\0') | |
2007 | show_menu = 1; | |
2008 | #endif | |
726f6388 JA |
2009 | } |
2010 | ||
2011 | loop_level--; | |
2012 | ||
726f6388 JA |
2013 | run_unwind_frame ("select"); |
2014 | return (retval); | |
2015 | } | |
2016 | #endif /* SELECT_COMMAND */ | |
2017 | ||
2018 | /* Execute a CASE command. The syntax is: CASE word_desc IN pattern_list ESAC. | |
2019 | The pattern_list is a linked list of pattern clauses; each clause contains | |
2020 | some patterns to compare word_desc against, and an associated command to | |
2021 | execute. */ | |
ccc6cda3 | 2022 | static int |
726f6388 JA |
2023 | execute_case_command (case_command) |
2024 | CASE_COM *case_command; | |
2025 | { | |
2026 | register WORD_LIST *list; | |
ccc6cda3 | 2027 | WORD_LIST *wlist, *es; |
726f6388 | 2028 | PATTERN_LIST *clauses; |
ccc6cda3 JA |
2029 | char *word, *pattern; |
2030 | int retval, match, ignore_return; | |
726f6388 JA |
2031 | |
2032 | /* Posix.2 specifies that the WORD is tilde expanded. */ | |
2033 | if (member ('~', case_command->word->word)) | |
2034 | { | |
7117c2d2 | 2035 | word = bash_tilde_expand (case_command->word->word, 0); |
726f6388 JA |
2036 | free (case_command->word->word); |
2037 | case_command->word->word = word; | |
2038 | } | |
2039 | ||
28ef6c31 | 2040 | wlist = expand_word_unsplit (case_command->word, 0); |
ccc6cda3 JA |
2041 | word = wlist ? string_list (wlist) : savestring (""); |
2042 | dispose_words (wlist); | |
2043 | ||
726f6388 | 2044 | retval = EXECUTION_SUCCESS; |
ccc6cda3 | 2045 | ignore_return = case_command->flags & CMD_IGNORE_RETURN; |
726f6388 JA |
2046 | |
2047 | begin_unwind_frame ("case"); | |
726f6388 JA |
2048 | add_unwind_protect ((Function *)xfree, word); |
2049 | ||
ccc6cda3 JA |
2050 | #define EXIT_CASE() goto exit_case_command |
2051 | ||
2052 | for (clauses = case_command->clauses; clauses; clauses = clauses->next) | |
726f6388 JA |
2053 | { |
2054 | QUIT; | |
ccc6cda3 | 2055 | for (list = clauses->patterns; list; list = list->next) |
726f6388 | 2056 | { |
726f6388 JA |
2057 | /* Posix.2 specifies to tilde expand each member of the pattern |
2058 | list. */ | |
2059 | if (member ('~', list->word->word)) | |
2060 | { | |
7117c2d2 | 2061 | pattern = bash_tilde_expand (list->word->word, 0); |
726f6388 | 2062 | free (list->word->word); |
ccc6cda3 | 2063 | list->word->word = pattern; |
726f6388 JA |
2064 | } |
2065 | ||
2066 | es = expand_word_leave_quoted (list->word, 0); | |
2067 | ||
2068 | if (es && es->word && es->word->word && *(es->word->word)) | |
cce855bc | 2069 | pattern = quote_string_for_globbing (es->word->word, QGLOB_CVTNULL); |
726f6388 | 2070 | else |
ccc6cda3 | 2071 | { |
f73dda09 | 2072 | pattern = (char *)xmalloc (1); |
ccc6cda3 JA |
2073 | pattern[0] = '\0'; |
2074 | } | |
726f6388 JA |
2075 | |
2076 | /* Since the pattern does not undergo quote removal (as per | |
f73dda09 | 2077 | Posix.2, section 3.9.4.3), the strmatch () call must be able |
726f6388 | 2078 | to recognize backslashes as escape characters. */ |
f73dda09 | 2079 | match = strmatch (pattern, word, FNMATCH_EXTFLAG) != FNM_NOMATCH; |
726f6388 JA |
2080 | free (pattern); |
2081 | ||
2082 | dispose_words (es); | |
2083 | ||
2084 | if (match) | |
2085 | { | |
ccc6cda3 | 2086 | if (clauses->action && ignore_return) |
726f6388 | 2087 | clauses->action->flags |= CMD_IGNORE_RETURN; |
ccc6cda3 JA |
2088 | retval = execute_command (clauses->action); |
2089 | EXIT_CASE (); | |
726f6388 JA |
2090 | } |
2091 | ||
726f6388 JA |
2092 | QUIT; |
2093 | } | |
726f6388 JA |
2094 | } |
2095 | ||
ccc6cda3 JA |
2096 | exit_case_command: |
2097 | free (word); | |
726f6388 | 2098 | discard_unwind_frame ("case"); |
726f6388 JA |
2099 | return (retval); |
2100 | } | |
2101 | ||
2102 | #define CMD_WHILE 0 | |
2103 | #define CMD_UNTIL 1 | |
2104 | ||
2105 | /* The WHILE command. Syntax: WHILE test DO action; DONE. | |
2106 | Repeatedly execute action while executing test produces | |
2107 | EXECUTION_SUCCESS. */ | |
ccc6cda3 | 2108 | static int |
726f6388 JA |
2109 | execute_while_command (while_command) |
2110 | WHILE_COM *while_command; | |
2111 | { | |
2112 | return (execute_while_or_until (while_command, CMD_WHILE)); | |
2113 | } | |
2114 | ||
2115 | /* UNTIL is just like WHILE except that the test result is negated. */ | |
ccc6cda3 | 2116 | static int |
726f6388 JA |
2117 | execute_until_command (while_command) |
2118 | WHILE_COM *while_command; | |
2119 | { | |
2120 | return (execute_while_or_until (while_command, CMD_UNTIL)); | |
2121 | } | |
2122 | ||
2123 | /* The body for both while and until. The only difference between the | |
2124 | two is that the test value is treated differently. TYPE is | |
2125 | CMD_WHILE or CMD_UNTIL. The return value for both commands should | |
2126 | be EXECUTION_SUCCESS if no commands in the body are executed, and | |
2127 | the status of the last command executed in the body otherwise. */ | |
ccc6cda3 | 2128 | static int |
726f6388 JA |
2129 | execute_while_or_until (while_command, type) |
2130 | WHILE_COM *while_command; | |
2131 | int type; | |
2132 | { | |
2133 | int return_value, body_status; | |
2134 | ||
2135 | body_status = EXECUTION_SUCCESS; | |
2136 | loop_level++; | |
2137 | ||
2138 | while_command->test->flags |= CMD_IGNORE_RETURN; | |
2139 | if (while_command->flags & CMD_IGNORE_RETURN) | |
2140 | while_command->action->flags |= CMD_IGNORE_RETURN; | |
2141 | ||
2142 | while (1) | |
2143 | { | |
2144 | return_value = execute_command (while_command->test); | |
2145 | REAP (); | |
2146 | ||
f73dda09 JA |
2147 | /* Need to handle `break' in the test when we would break out of the |
2148 | loop. The job control code will set `breaking' to loop_level | |
2149 | when a job in a loop is stopped with SIGTSTP. If the stopped job | |
2150 | is in the loop test, `breaking' will not be reset unless we do | |
2151 | this, and the shell will cease to execute commands. */ | |
726f6388 | 2152 | if (type == CMD_WHILE && return_value != EXECUTION_SUCCESS) |
f73dda09 JA |
2153 | { |
2154 | if (breaking) | |
2155 | breaking--; | |
2156 | break; | |
2157 | } | |
726f6388 | 2158 | if (type == CMD_UNTIL && return_value == EXECUTION_SUCCESS) |
f73dda09 JA |
2159 | { |
2160 | if (breaking) | |
2161 | breaking--; | |
2162 | break; | |
2163 | } | |
726f6388 JA |
2164 | |
2165 | QUIT; | |
2166 | body_status = execute_command (while_command->action); | |
2167 | QUIT; | |
2168 | ||
2169 | if (breaking) | |
2170 | { | |
2171 | breaking--; | |
2172 | break; | |
2173 | } | |
2174 | ||
2175 | if (continuing) | |
2176 | { | |
2177 | continuing--; | |
2178 | if (continuing) | |
2179 | break; | |
2180 | } | |
2181 | } | |
2182 | loop_level--; | |
2183 | ||
2184 | return (body_status); | |
2185 | } | |
2186 | ||
2187 | /* IF test THEN command [ELSE command]. | |
2188 | IF also allows ELIF in the place of ELSE IF, but | |
2189 | the parser makes *that* stupidity transparent. */ | |
ccc6cda3 | 2190 | static int |
726f6388 JA |
2191 | execute_if_command (if_command) |
2192 | IF_COM *if_command; | |
2193 | { | |
2194 | int return_value; | |
2195 | ||
2196 | if_command->test->flags |= CMD_IGNORE_RETURN; | |
2197 | return_value = execute_command (if_command->test); | |
2198 | ||
2199 | if (return_value == EXECUTION_SUCCESS) | |
2200 | { | |
2201 | QUIT; | |
ccc6cda3 | 2202 | |
726f6388 | 2203 | if (if_command->true_case && (if_command->flags & CMD_IGNORE_RETURN)) |
ccc6cda3 JA |
2204 | if_command->true_case->flags |= CMD_IGNORE_RETURN; |
2205 | ||
726f6388 JA |
2206 | return (execute_command (if_command->true_case)); |
2207 | } | |
2208 | else | |
2209 | { | |
2210 | QUIT; | |
2211 | ||
2212 | if (if_command->false_case && (if_command->flags & CMD_IGNORE_RETURN)) | |
2213 | if_command->false_case->flags |= CMD_IGNORE_RETURN; | |
2214 | ||
2215 | return (execute_command (if_command->false_case)); | |
2216 | } | |
2217 | } | |
2218 | ||
cce855bc JA |
2219 | #if defined (DPAREN_ARITHMETIC) |
2220 | static int | |
2221 | execute_arith_command (arith_command) | |
2222 | ARITH_COM *arith_command; | |
2223 | { | |
f73dda09 | 2224 | int expok; |
7117c2d2 | 2225 | intmax_t expresult; |
f73dda09 | 2226 | WORD_LIST *new; |
cce855bc | 2227 | |
f73dda09 | 2228 | expresult = 0; |
cce855bc | 2229 | |
b72432fd | 2230 | this_command_name = "(("; /* )) */ |
cce855bc | 2231 | /* If we're in a function, update the line number information. */ |
7117c2d2 | 2232 | if (variable_context && interactive_shell) |
cce855bc JA |
2233 | line_number = arith_command->line - function_line_number; |
2234 | ||
7117c2d2 JA |
2235 | /* Run the debug trap before each arithmetic command, but do it after we |
2236 | update the line number information and before we expand the various | |
2237 | words in the expression. */ | |
2238 | if (signal_is_trapped (DEBUG_TRAP) && signal_is_ignored (DEBUG_TRAP) == 0) | |
2239 | run_debug_trap (); | |
2240 | ||
cce855bc JA |
2241 | new = expand_words (arith_command->exp); |
2242 | ||
2243 | /* If we're tracing, make a new word list with `((' at the front and `))' | |
2244 | at the back and print it. */ | |
2245 | if (echo_command_at_execute) | |
2246 | xtrace_print_arith_cmd (new); | |
2247 | ||
f73dda09 | 2248 | expresult = evalexp (new->word->word, &expok); |
cce855bc JA |
2249 | dispose_words (new); |
2250 | ||
2251 | if (expok == 0) | |
2252 | return (EXECUTION_FAILURE); | |
2253 | ||
f73dda09 | 2254 | return (expresult == 0 ? EXECUTION_FAILURE : EXECUTION_SUCCESS); |
cce855bc JA |
2255 | } |
2256 | #endif /* DPAREN_ARITHMETIC */ | |
2257 | ||
2258 | #if defined (COND_COMMAND) | |
2259 | ||
2260 | static char *nullstr = ""; | |
2261 | ||
2262 | static int | |
2263 | execute_cond_node (cond) | |
2264 | COND_COM *cond; | |
2265 | { | |
f73dda09 JA |
2266 | int result, invert, patmatch; |
2267 | char *arg1, *arg2; | |
cce855bc JA |
2268 | |
2269 | invert = (cond->flags & CMD_INVERT_RETURN); | |
2270 | ||
2271 | if (cond->type == COND_EXPR) | |
2272 | result = execute_cond_node (cond->left); | |
2273 | else if (cond->type == COND_OR) | |
2274 | { | |
2275 | result = execute_cond_node (cond->left); | |
2276 | if (result != EXECUTION_SUCCESS) | |
2277 | result = execute_cond_node (cond->right); | |
2278 | } | |
2279 | else if (cond->type == COND_AND) | |
2280 | { | |
2281 | result = execute_cond_node (cond->left); | |
2282 | if (result == EXECUTION_SUCCESS) | |
2283 | result = execute_cond_node (cond->right); | |
2284 | } | |
2285 | else if (cond->type == COND_UNARY) | |
2286 | { | |
2287 | arg1 = cond_expand_word (cond->left->op, 0); | |
2288 | if (arg1 == 0) | |
2289 | arg1 = nullstr; | |
2290 | if (echo_command_at_execute) | |
2291 | xtrace_print_cond_term (cond->type, invert, cond->op, arg1, (char *)NULL); | |
2292 | result = unary_test (cond->op->word, arg1) ? EXECUTION_SUCCESS : EXECUTION_FAILURE; | |
2293 | if (arg1 != nullstr) | |
2294 | free (arg1); | |
2295 | } | |
2296 | else if (cond->type == COND_BINARY) | |
2297 | { | |
b72432fd JA |
2298 | patmatch = ((cond->op->word[1] == '=') && (cond->op->word[2] == '\0') && |
2299 | (cond->op->word[0] == '!' || cond->op->word[0] == '=') || | |
2300 | (cond->op->word[0] == '=' && cond->op->word[1] == '\0')); | |
cce855bc JA |
2301 | |
2302 | arg1 = cond_expand_word (cond->left->op, 0); | |
2303 | if (arg1 == 0) | |
2304 | arg1 = nullstr; | |
2305 | arg2 = cond_expand_word (cond->right->op, patmatch); | |
2306 | if (arg2 == 0) | |
2307 | arg2 = nullstr; | |
2308 | ||
2309 | if (echo_command_at_execute) | |
2310 | xtrace_print_cond_term (cond->type, invert, cond->op, arg1, arg2); | |
2311 | ||
2312 | result = binary_test (cond->op->word, arg1, arg2, TEST_PATMATCH|TEST_ARITHEXP) | |
2313 | ? EXECUTION_SUCCESS | |
2314 | : EXECUTION_FAILURE; | |
2315 | if (arg1 != nullstr) | |
2316 | free (arg1); | |
2317 | if (arg2 != nullstr) | |
2318 | free (arg2); | |
2319 | } | |
2320 | else | |
2321 | { | |
b72432fd | 2322 | command_error ("execute_cond_node", CMDERR_BADTYPE, cond->type, 0); |
cce855bc JA |
2323 | jump_to_top_level (DISCARD); |
2324 | result = EXECUTION_FAILURE; | |
2325 | } | |
2326 | ||
2327 | if (invert) | |
2328 | result = (result == EXECUTION_SUCCESS) ? EXECUTION_FAILURE : EXECUTION_SUCCESS; | |
2329 | ||
2330 | return result; | |
2331 | } | |
2332 | ||
2333 | static int | |
2334 | execute_cond_command (cond_command) | |
2335 | COND_COM *cond_command; | |
2336 | { | |
2337 | int result; | |
2338 | ||
2339 | result = EXECUTION_SUCCESS; | |
2340 | ||
2341 | this_command_name = "[["; | |
2342 | /* If we're in a function, update the line number information. */ | |
7117c2d2 | 2343 | if (variable_context && interactive_shell) |
cce855bc JA |
2344 | line_number = cond_command->line - function_line_number; |
2345 | ||
7117c2d2 JA |
2346 | /* Run the debug trap before each conditional command, but do it after we |
2347 | update the line number information. */ | |
2348 | if (signal_is_trapped (DEBUG_TRAP) && signal_is_ignored (DEBUG_TRAP) == 0) | |
2349 | run_debug_trap (); | |
2350 | ||
cce855bc JA |
2351 | #if 0 |
2352 | debug_print_cond_command (cond_command); | |
2353 | #endif | |
2354 | last_command_exit_value = result = execute_cond_node (cond_command); | |
2355 | return (result); | |
2356 | } | |
2357 | #endif /* COND_COMMAND */ | |
2358 | ||
726f6388 JA |
2359 | static void |
2360 | bind_lastarg (arg) | |
2361 | char *arg; | |
2362 | { | |
2363 | SHELL_VAR *var; | |
2364 | ||
ccc6cda3 | 2365 | if (arg == 0) |
726f6388 JA |
2366 | arg = ""; |
2367 | var = bind_variable ("_", arg); | |
bb70624e | 2368 | VUNSETATTR (var, att_exported); |
726f6388 JA |
2369 | } |
2370 | ||
ccc6cda3 JA |
2371 | /* Execute a null command. Fork a subshell if the command uses pipes or is |
2372 | to be run asynchronously. This handles all the side effects that are | |
2373 | supposed to take place. */ | |
2374 | static int | |
2375 | execute_null_command (redirects, pipe_in, pipe_out, async, old_last_command_subst_pid) | |
2376 | REDIRECT *redirects; | |
bb70624e JA |
2377 | int pipe_in, pipe_out, async; |
2378 | pid_t old_last_command_subst_pid; | |
ccc6cda3 JA |
2379 | { |
2380 | if (pipe_in != NO_PIPE || pipe_out != NO_PIPE || async) | |
2381 | { | |
2382 | /* We have a null command, but we really want a subshell to take | |
2383 | care of it. Just fork, do piping and redirections, and exit. */ | |
2384 | if (make_child ((char *)NULL, async) == 0) | |
2385 | { | |
2386 | /* Cancel traps, in trap.c. */ | |
2387 | restore_original_signals (); /* XXX */ | |
2388 | ||
2389 | do_piping (pipe_in, pipe_out); | |
2390 | ||
2391 | subshell_environment = SUBSHELL_ASYNC; | |
2392 | ||
2393 | if (do_redirections (redirects, 1, 0, 0) == 0) | |
2394 | exit (EXECUTION_SUCCESS); | |
2395 | else | |
2396 | exit (EXECUTION_FAILURE); | |
2397 | } | |
2398 | else | |
2399 | { | |
2400 | close_pipes (pipe_in, pipe_out); | |
2401 | #if defined (PROCESS_SUBSTITUTION) && defined (HAVE_DEV_FD) | |
2402 | unlink_fifo_list (); | |
2403 | #endif | |
2404 | return (EXECUTION_SUCCESS); | |
2405 | } | |
2406 | } | |
2407 | else | |
2408 | { | |
2409 | /* Even if there aren't any command names, pretend to do the | |
2410 | redirections that are specified. The user expects the side | |
2411 | effects to take place. If the redirections fail, then return | |
2412 | failure. Otherwise, if a command substitution took place while | |
2413 | expanding the command or a redirection, return the value of that | |
2414 | substitution. Otherwise, return EXECUTION_SUCCESS. */ | |
2415 | ||
2416 | if (do_redirections (redirects, 0, 0, 0) != 0) | |
2417 | return (EXECUTION_FAILURE); | |
2418 | else if (old_last_command_subst_pid != last_command_subst_pid) | |
2419 | return (last_command_exit_value); | |
2420 | else | |
2421 | return (EXECUTION_SUCCESS); | |
2422 | } | |
2423 | } | |
2424 | ||
2425 | /* This is a hack to suppress word splitting for assignment statements | |
2426 | given as arguments to builtins with the ASSIGNMENT_BUILTIN flag set. */ | |
2427 | static void | |
2428 | fix_assignment_words (words) | |
2429 | WORD_LIST *words; | |
2430 | { | |
2431 | WORD_LIST *w; | |
2432 | struct builtin *b; | |
2433 | ||
2434 | if (words == 0) | |
2435 | return; | |
2436 | ||
7117c2d2 | 2437 | b = 0; |
ccc6cda3 JA |
2438 | |
2439 | for (w = words; w; w = w->next) | |
2440 | if (w->word->flags & W_ASSIGNMENT) | |
7117c2d2 JA |
2441 | { |
2442 | if (b == 0) | |
2443 | { | |
2444 | b = builtin_address_internal (words->word->word, 0); | |
2445 | if (b == 0 || (b->flags & ASSIGNMENT_BUILTIN) == 0) | |
2446 | return; | |
2447 | } | |
2448 | w->word->flags |= (W_NOSPLIT|W_NOGLOB|W_TILDEEXP); | |
2449 | } | |
ccc6cda3 JA |
2450 | } |
2451 | ||
726f6388 JA |
2452 | /* The meaty part of all the executions. We have to start hacking the |
2453 | real execution of commands here. Fork a process, set things up, | |
2454 | execute the command. */ | |
ccc6cda3 | 2455 | static int |
726f6388 JA |
2456 | execute_simple_command (simple_command, pipe_in, pipe_out, async, fds_to_close) |
2457 | SIMPLE_COM *simple_command; | |
2458 | int pipe_in, pipe_out, async; | |
2459 | struct fd_bitmap *fds_to_close; | |
2460 | { | |
2461 | WORD_LIST *words, *lastword; | |
ccc6cda3 | 2462 | char *command_line, *lastarg, *temp; |
bc4cd23c | 2463 | int first_word_quoted, result, builtin_is_special, already_forked, dofork; |
b72432fd | 2464 | pid_t old_last_command_subst_pid, old_last_async_pid; |
f73dda09 | 2465 | sh_builtin_func_t *builtin; |
ccc6cda3 | 2466 | SHELL_VAR *func; |
726f6388 JA |
2467 | |
2468 | result = EXECUTION_SUCCESS; | |
ccc6cda3 | 2469 | special_builtin_failed = builtin_is_special = 0; |
cce855bc | 2470 | command_line = (char *)0; |
726f6388 | 2471 | |
ccc6cda3 | 2472 | /* If we're in a function, update the line number information. */ |
7117c2d2 | 2473 | if (variable_context && interactive_shell) |
726f6388 JA |
2474 | line_number = simple_command->line - function_line_number; |
2475 | ||
7117c2d2 JA |
2476 | /* Run the debug trap before each simple command, but do it after we |
2477 | update the line number information. */ | |
2478 | if (signal_is_trapped (DEBUG_TRAP) && signal_is_ignored (DEBUG_TRAP) == 0) | |
2479 | run_debug_trap (); | |
2480 | ||
726f6388 JA |
2481 | /* Remember what this command line looks like at invocation. */ |
2482 | command_string_index = 0; | |
2483 | print_simple_command (simple_command); | |
726f6388 JA |
2484 | |
2485 | first_word_quoted = | |
ccc6cda3 | 2486 | simple_command->words ? (simple_command->words->word->flags & W_QUOTED): 0; |
726f6388 JA |
2487 | |
2488 | old_last_command_subst_pid = last_command_subst_pid; | |
b72432fd | 2489 | old_last_async_pid = last_asynchronous_pid; |
726f6388 | 2490 | |
bc4cd23c JA |
2491 | already_forked = dofork = 0; |
2492 | ||
2493 | /* If we're in a pipeline or run in the background, set DOFORK so we | |
2494 | make the child early, before word expansion. This keeps assignment | |
2495 | statements from affecting the parent shell's environment when they | |
2496 | should not. */ | |
2497 | dofork = pipe_in != NO_PIPE || pipe_out != NO_PIPE || async; | |
2498 | ||
2499 | /* Something like `%2 &' should restart job 2 in the background, not cause | |
2500 | the shell to fork here. */ | |
2501 | if (dofork && pipe_in == NO_PIPE && pipe_out == NO_PIPE && | |
2502 | simple_command->words && simple_command->words->word && | |
2503 | simple_command->words->word->word && | |
2504 | (simple_command->words->word->word[0] == '%')) | |
2505 | dofork = 0; | |
2506 | ||
2507 | if (dofork) | |
cce855bc JA |
2508 | { |
2509 | /* XXX memory leak if expand_words() error causes a jump_to_top_level */ | |
2510 | command_line = savestring (the_printed_command); | |
2511 | ||
bb70624e JA |
2512 | /* Do this now, because execute_disk_command will do it anyway in the |
2513 | vast majority of cases. */ | |
2514 | maybe_make_export_env (); | |
2515 | ||
cce855bc JA |
2516 | if (make_child (command_line, async) == 0) |
2517 | { | |
2518 | already_forked = 1; | |
2519 | simple_command->flags |= CMD_NO_FORK; | |
2520 | ||
28ef6c31 JA |
2521 | subshell_environment = (pipe_in != NO_PIPE || pipe_out != NO_PIPE) |
2522 | ? (SUBSHELL_PIPE|SUBSHELL_FORK) | |
2523 | : (SUBSHELL_ASYNC|SUBSHELL_FORK); | |
2524 | ||
bb70624e JA |
2525 | /* We need to do this before piping to handle some really |
2526 | pathological cases where one of the pipe file descriptors | |
2527 | is < 2. */ | |
2528 | if (fds_to_close) | |
2529 | close_fd_bitmap (fds_to_close); | |
2530 | ||
cce855bc | 2531 | do_piping (pipe_in, pipe_out); |
f73dda09 | 2532 | pipe_in = pipe_out = NO_PIPE; |
cce855bc | 2533 | |
b72432fd | 2534 | last_asynchronous_pid = old_last_async_pid; |
cce855bc JA |
2535 | } |
2536 | else | |
2537 | { | |
2538 | close_pipes (pipe_in, pipe_out); | |
2539 | #if defined (PROCESS_SUBSTITUTION) && defined (HAVE_DEV_FD) | |
2540 | unlink_fifo_list (); | |
2541 | #endif | |
2542 | command_line = (char *)NULL; /* don't free this. */ | |
2543 | bind_lastarg ((char *)NULL); | |
2544 | return (result); | |
2545 | } | |
2546 | } | |
2547 | ||
726f6388 JA |
2548 | /* If we are re-running this as the result of executing the `command' |
2549 | builtin, do not expand the command words a second time. */ | |
2550 | if ((simple_command->flags & CMD_INHIBIT_EXPANSION) == 0) | |
2551 | { | |
2552 | current_fds_to_close = fds_to_close; | |
ccc6cda3 | 2553 | fix_assignment_words (simple_command->words); |
726f6388 JA |
2554 | words = expand_words (simple_command->words); |
2555 | current_fds_to_close = (struct fd_bitmap *)NULL; | |
2556 | } | |
2557 | else | |
2558 | words = copy_word_list (simple_command->words); | |
2559 | ||
726f6388 JA |
2560 | /* It is possible for WORDS not to have anything left in it. |
2561 | Perhaps all the words consisted of `$foo', and there was | |
2562 | no variable `$foo'. */ | |
ccc6cda3 | 2563 | if (words == 0) |
726f6388 | 2564 | { |
ccc6cda3 | 2565 | result = execute_null_command (simple_command->redirects, |
cce855bc JA |
2566 | pipe_in, pipe_out, |
2567 | already_forked ? 0 : async, | |
ccc6cda3 | 2568 | old_last_command_subst_pid); |
cce855bc JA |
2569 | if (already_forked) |
2570 | exit (result); | |
2571 | else | |
2572 | { | |
2573 | bind_lastarg ((char *)NULL); | |
2574 | set_pipestatus_from_exit (result); | |
2575 | return (result); | |
2576 | } | |
ccc6cda3 | 2577 | } |
726f6388 | 2578 | |
ccc6cda3 | 2579 | lastarg = (char *)NULL; |
726f6388 | 2580 | |
ccc6cda3 | 2581 | begin_unwind_frame ("simple-command"); |
726f6388 | 2582 | |
ccc6cda3 JA |
2583 | if (echo_command_at_execute) |
2584 | xtrace_print_word_list (words); | |
726f6388 | 2585 | |
f73dda09 | 2586 | builtin = (sh_builtin_func_t *)NULL; |
ccc6cda3 JA |
2587 | func = (SHELL_VAR *)NULL; |
2588 | if ((simple_command->flags & CMD_NO_FUNCTIONS) == 0) | |
2589 | { | |
2590 | /* Posix.2 says special builtins are found before functions. We | |
2591 | don't set builtin_is_special anywhere other than here, because | |
2592 | this path is followed only when the `command' builtin is *not* | |
2593 | being used, and we don't want to exit the shell if a special | |
2594 | builtin executed with `command builtin' fails. `command' is not | |
2595 | a special builtin. */ | |
2596 | if (posixly_correct) | |
2597 | { | |
2598 | builtin = find_special_builtin (words->word->word); | |
2599 | if (builtin) | |
2600 | builtin_is_special = 1; | |
726f6388 | 2601 | } |
ccc6cda3 | 2602 | if (builtin == 0) |
726f6388 | 2603 | func = find_function (words->word->word); |
ccc6cda3 | 2604 | } |
726f6388 | 2605 | |
ccc6cda3 JA |
2606 | add_unwind_protect (dispose_words, words); |
2607 | QUIT; | |
726f6388 | 2608 | |
ccc6cda3 JA |
2609 | /* Bind the last word in this command to "$_" after execution. */ |
2610 | for (lastword = words; lastword->next; lastword = lastword->next) | |
2611 | ; | |
2612 | lastarg = lastword->word->word; | |
726f6388 JA |
2613 | |
2614 | #if defined (JOB_CONTROL) | |
ccc6cda3 | 2615 | /* Is this command a job control related thing? */ |
cce855bc | 2616 | if (words->word->word[0] == '%' && already_forked == 0) |
ccc6cda3 JA |
2617 | { |
2618 | this_command_name = async ? "bg" : "fg"; | |
726f6388 | 2619 | last_shell_builtin = this_shell_builtin; |
ccc6cda3 JA |
2620 | this_shell_builtin = builtin_address (this_command_name); |
2621 | result = (*this_shell_builtin) (words); | |
2622 | goto return_result; | |
2623 | } | |
726f6388 | 2624 | |
ccc6cda3 JA |
2625 | /* One other possiblilty. The user may want to resume an existing job. |
2626 | If they do, find out whether this word is a candidate for a running | |
2627 | job. */ | |
cce855bc | 2628 | if (job_control && already_forked == 0 && async == 0 && |
ccc6cda3 JA |
2629 | !first_word_quoted && |
2630 | !words->next && | |
2631 | words->word->word[0] && | |
2632 | !simple_command->redirects && | |
2633 | pipe_in == NO_PIPE && | |
2634 | pipe_out == NO_PIPE && | |
2635 | (temp = get_string_value ("auto_resume"))) | |
2636 | { | |
7117c2d2 | 2637 | int job, jflags, started_status; |
ccc6cda3 | 2638 | |
7117c2d2 JA |
2639 | jflags = JM_STOPPED|JM_FIRSTMATCH; |
2640 | if (STREQ (temp, "exact")) | |
2641 | jflags |= JM_EXACT; | |
2642 | else if (STREQ (temp, "substring")) | |
2643 | jflags |= JM_SUBSTRING; | |
2644 | else | |
2645 | jflags |= JM_PREFIX; | |
2646 | job = get_job_by_name (words->word->word, jflags); | |
2647 | if (job != NO_JOB) | |
726f6388 | 2648 | { |
7117c2d2 JA |
2649 | run_unwind_frame ("simple-command"); |
2650 | this_command_name = "fg"; | |
2651 | last_shell_builtin = this_shell_builtin; | |
2652 | this_shell_builtin = builtin_address ("fg"); | |
ccc6cda3 | 2653 | |
7117c2d2 JA |
2654 | started_status = start_job (job, 1); |
2655 | return ((started_status < 0) ? EXECUTION_FAILURE : started_status); | |
726f6388 | 2656 | } |
ccc6cda3 JA |
2657 | } |
2658 | #endif /* JOB_CONTROL */ | |
726f6388 | 2659 | |
ccc6cda3 JA |
2660 | /* Remember the name of this command globally. */ |
2661 | this_command_name = words->word->word; | |
726f6388 | 2662 | |
ccc6cda3 JA |
2663 | QUIT; |
2664 | ||
2665 | /* This command could be a shell builtin or a user-defined function. | |
2666 | We have already found special builtins by this time, so we do not | |
2667 | set builtin_is_special. If this is a function or builtin, and we | |
2668 | have pipes, then fork a subshell in here. Otherwise, just execute | |
2669 | the command directly. */ | |
2670 | if (func == 0 && builtin == 0) | |
2671 | builtin = find_shell_builtin (this_command_name); | |
2672 | ||
2673 | last_shell_builtin = this_shell_builtin; | |
2674 | this_shell_builtin = builtin; | |
2675 | ||
2676 | if (builtin || func) | |
726f6388 | 2677 | { |
28ef6c31 | 2678 | if (already_forked) |
726f6388 | 2679 | { |
cce855bc JA |
2680 | /* reset_terminating_signals (); */ /* XXX */ |
2681 | /* Cancel traps, in trap.c. */ | |
2682 | restore_original_signals (); | |
726f6388 | 2683 | |
cce855bc | 2684 | if (async) |
ccc6cda3 | 2685 | { |
cce855bc JA |
2686 | if ((simple_command->flags & CMD_STDIN_REDIR) && |
2687 | pipe_in == NO_PIPE && | |
2688 | (stdin_redirects (simple_command->redirects) == 0)) | |
2689 | async_redirect_stdin (); | |
2690 | setup_async_signals (); | |
ccc6cda3 | 2691 | } |
cce855bc JA |
2692 | |
2693 | execute_subshell_builtin_or_function | |
2694 | (words, simple_command->redirects, builtin, func, | |
2695 | pipe_in, pipe_out, async, fds_to_close, | |
2696 | simple_command->flags); | |
726f6388 JA |
2697 | } |
2698 | else | |
2699 | { | |
ccc6cda3 JA |
2700 | result = execute_builtin_or_function |
2701 | (words, builtin, func, simple_command->redirects, fds_to_close, | |
2702 | simple_command->flags); | |
2703 | if (builtin) | |
2704 | { | |
2705 | if (result > EX_SHERRBASE) | |
2706 | { | |
cce855bc JA |
2707 | result = builtin_status (result); |
2708 | if (builtin_is_special) | |
2709 | special_builtin_failed = 1; | |
ccc6cda3 JA |
2710 | } |
2711 | /* In POSIX mode, if there are assignment statements preceding | |
2712 | a special builtin, they persist after the builtin | |
2713 | completes. */ | |
2714 | if (posixly_correct && builtin_is_special && temporary_env) | |
2715 | merge_temporary_env (); | |
2716 | } | |
2717 | else /* function */ | |
2718 | { | |
2719 | if (result == EX_USAGE) | |
2720 | result = EX_BADUSAGE; | |
2721 | else if (result > EX_SHERRBASE) | |
cce855bc | 2722 | result = EXECUTION_FAILURE; |
ccc6cda3 JA |
2723 | } |
2724 | ||
cce855bc JA |
2725 | set_pipestatus_from_exit (result); |
2726 | ||
726f6388 JA |
2727 | goto return_result; |
2728 | } | |
2729 | } | |
726f6388 | 2730 | |
cce855bc JA |
2731 | if (command_line == 0) |
2732 | command_line = savestring (the_printed_command); | |
2733 | ||
ccc6cda3 JA |
2734 | execute_disk_command (words, simple_command->redirects, command_line, |
2735 | pipe_in, pipe_out, async, fds_to_close, | |
d166f048 | 2736 | simple_command->flags); |
726f6388 JA |
2737 | |
2738 | return_result: | |
2739 | bind_lastarg (lastarg); | |
ccc6cda3 JA |
2740 | FREE (command_line); |
2741 | run_unwind_frame ("simple-command"); | |
726f6388 JA |
2742 | return (result); |
2743 | } | |
2744 | ||
ccc6cda3 JA |
2745 | /* Translate the special builtin exit statuses. We don't really need a |
2746 | function for this; it's a placeholder for future work. */ | |
2747 | static int | |
2748 | builtin_status (result) | |
2749 | int result; | |
2750 | { | |
2751 | int r; | |
2752 | ||
2753 | switch (result) | |
2754 | { | |
2755 | case EX_USAGE: | |
2756 | r = EX_BADUSAGE; | |
2757 | break; | |
2758 | case EX_REDIRFAIL: | |
2759 | case EX_BADSYNTAX: | |
2760 | case EX_BADASSIGN: | |
2761 | case EX_EXPFAIL: | |
2762 | r = EXECUTION_FAILURE; | |
2763 | break; | |
2764 | default: | |
2765 | r = EXECUTION_SUCCESS; | |
2766 | break; | |
2767 | } | |
2768 | return (r); | |
2769 | } | |
2770 | ||
726f6388 JA |
2771 | static int |
2772 | execute_builtin (builtin, words, flags, subshell) | |
f73dda09 | 2773 | sh_builtin_func_t *builtin; |
726f6388 JA |
2774 | WORD_LIST *words; |
2775 | int flags, subshell; | |
2776 | { | |
d166f048 | 2777 | int old_e_flag, result, eval_unwind; |
7117c2d2 | 2778 | int isbltinenv; |
726f6388 | 2779 | |
ccc6cda3 | 2780 | old_e_flag = exit_immediately_on_error; |
726f6388 JA |
2781 | /* The eval builtin calls parse_and_execute, which does not know about |
2782 | the setting of flags, and always calls the execution functions with | |
2783 | flags that will exit the shell on an error if -e is set. If the | |
2784 | eval builtin is being called, and we're supposed to ignore the exit | |
2785 | value of the command, we turn the -e flag off ourselves, then | |
2786 | restore it when the command completes. */ | |
2787 | if (subshell == 0 && builtin == eval_builtin && (flags & CMD_IGNORE_RETURN)) | |
2788 | { | |
2789 | begin_unwind_frame ("eval_builtin"); | |
2790 | unwind_protect_int (exit_immediately_on_error); | |
2791 | exit_immediately_on_error = 0; | |
d166f048 | 2792 | eval_unwind = 1; |
726f6388 | 2793 | } |
d166f048 JA |
2794 | else |
2795 | eval_unwind = 0; | |
726f6388 JA |
2796 | |
2797 | /* The temporary environment for a builtin is supposed to apply to | |
2798 | all commands executed by that builtin. Currently, this is a | |
d166f048 | 2799 | problem only with the `source' and `eval' builtins. */ |
7117c2d2 JA |
2800 | isbltinenv = (builtin == source_builtin || builtin == eval_builtin); |
2801 | if (isbltinenv) | |
726f6388 JA |
2802 | { |
2803 | if (subshell == 0) | |
2804 | begin_unwind_frame ("builtin_env"); | |
2805 | ||
2806 | if (temporary_env) | |
2807 | { | |
7117c2d2 | 2808 | push_scope (VC_BLTNENV, temporary_env); |
726f6388 | 2809 | if (subshell == 0) |
7117c2d2 JA |
2810 | add_unwind_protect (pop_scope, "1"); |
2811 | temporary_env = (HASH_TABLE *)NULL; | |
726f6388 | 2812 | } |
28ef6c31 JA |
2813 | } |
2814 | ||
2815 | /* `return' does a longjmp() back to a saved environment in execute_function. | |
2816 | If a variable assignment list preceded the command, and the shell is | |
2817 | running in POSIX mode, we need to merge that into the shell_variables | |
2818 | table, since `return' is a POSIX special builtin. */ | |
2819 | if (posixly_correct && subshell == 0 && builtin == return_builtin && temporary_env) | |
2820 | { | |
2821 | begin_unwind_frame ("return_temp_env"); | |
2822 | add_unwind_protect (merge_temporary_env, (char *)NULL); | |
726f6388 JA |
2823 | } |
2824 | ||
2825 | result = ((*builtin) (words->next)); | |
2826 | ||
28ef6c31 JA |
2827 | /* This shouldn't happen, but in case `return' comes back instead of |
2828 | longjmp'ing, we need to unwind. */ | |
2829 | if (posixly_correct && subshell == 0 && builtin == return_builtin && temporary_env) | |
2830 | discard_unwind_frame ("return_temp_env"); | |
2831 | ||
7117c2d2 JA |
2832 | if (subshell == 0 && isbltinenv) |
2833 | run_unwind_frame ("builtin_env"); | |
726f6388 | 2834 | |
d166f048 | 2835 | if (eval_unwind) |
726f6388 JA |
2836 | { |
2837 | exit_immediately_on_error += old_e_flag; | |
2838 | discard_unwind_frame ("eval_builtin"); | |
2839 | } | |
2840 | ||
2841 | return (result); | |
2842 | } | |
2843 | ||
726f6388 JA |
2844 | static int |
2845 | execute_function (var, words, flags, fds_to_close, async, subshell) | |
2846 | SHELL_VAR *var; | |
2847 | WORD_LIST *words; | |
f73dda09 | 2848 | int flags; |
726f6388 | 2849 | struct fd_bitmap *fds_to_close; |
f73dda09 | 2850 | int async, subshell; |
726f6388 JA |
2851 | { |
2852 | int return_val, result; | |
2853 | COMMAND *tc, *fc; | |
f73dda09 JA |
2854 | char *debug_trap, *error_trap; |
2855 | ||
2856 | USE_VAR(fc); | |
726f6388 JA |
2857 | |
2858 | tc = (COMMAND *)copy_command (function_cell (var)); | |
2859 | if (tc && (flags & CMD_IGNORE_RETURN)) | |
2860 | tc->flags |= CMD_IGNORE_RETURN; | |
2861 | ||
726f6388 JA |
2862 | if (subshell == 0) |
2863 | { | |
ccc6cda3 | 2864 | begin_unwind_frame ("function_calling"); |
7117c2d2 | 2865 | push_context (var->name, subshell, temporary_env); |
726f6388 JA |
2866 | add_unwind_protect (pop_context, (char *)NULL); |
2867 | unwind_protect_int (line_number); | |
ccc6cda3 JA |
2868 | unwind_protect_int (return_catch_flag); |
2869 | unwind_protect_jmp_buf (return_catch); | |
2870 | add_unwind_protect (dispose_command, (char *)tc); | |
bb70624e | 2871 | unwind_protect_pointer (this_shell_function); |
ccc6cda3 | 2872 | unwind_protect_int (loop_level); |
726f6388 | 2873 | } |
7117c2d2 JA |
2874 | else |
2875 | push_context (var->name, subshell, temporary_env); /* don't unwind-protect for subshells */ | |
2876 | ||
2877 | temporary_env = (HASH_TABLE *)NULL; | |
726f6388 | 2878 | |
bb70624e JA |
2879 | this_shell_function = var; |
2880 | make_funcname_visible (1); | |
2881 | ||
f73dda09 JA |
2882 | debug_trap = TRAP_STRING(DEBUG_TRAP); |
2883 | error_trap = TRAP_STRING(ERROR_TRAP); | |
2884 | ||
2885 | /* The order of the unwind protects for debug_trap and error_trap is | |
2886 | important here! unwind-protect commands are run in reverse order | |
2887 | of registration. If this causes problems, take out the xfree | |
2888 | unwind-protect calls and live with the small memory leak. */ | |
7117c2d2 | 2889 | if (debug_trap && (trace_p (var) == 0)) |
ccc6cda3 JA |
2890 | { |
2891 | if (subshell == 0) | |
2892 | { | |
2893 | debug_trap = savestring (debug_trap); | |
cce855bc | 2894 | add_unwind_protect (xfree, debug_trap); |
ccc6cda3 JA |
2895 | add_unwind_protect (set_debug_trap, debug_trap); |
2896 | } | |
2897 | restore_default_signal (DEBUG_TRAP); | |
2898 | } | |
726f6388 | 2899 | |
f73dda09 JA |
2900 | if (error_trap) |
2901 | { | |
2902 | if (subshell == 0) | |
2903 | { | |
2904 | error_trap = savestring (error_trap); | |
2905 | add_unwind_protect (xfree, error_trap); | |
2906 | add_unwind_protect (set_error_trap, error_trap); | |
2907 | } | |
2908 | restore_default_signal (ERROR_TRAP); | |
2909 | } | |
2910 | ||
726f6388 JA |
2911 | /* The temporary environment for a function is supposed to apply to |
2912 | all commands executed within the function body. */ | |
726f6388 | 2913 | |
726f6388 JA |
2914 | remember_args (words->next, 1); |
2915 | ||
ccc6cda3 | 2916 | /* Number of the line on which the function body starts. */ |
7117c2d2 JA |
2917 | if (interactive_shell) |
2918 | line_number = function_line_number = tc->line; | |
726f6388 JA |
2919 | |
2920 | if (subshell) | |
2921 | { | |
2922 | #if defined (JOB_CONTROL) | |
2923 | stop_pipeline (async, (COMMAND *)NULL); | |
2924 | #endif | |
ccc6cda3 | 2925 | fc = (tc->type == cm_group) ? tc->value.Group->command : tc; |
726f6388 JA |
2926 | |
2927 | if (fc && (flags & CMD_IGNORE_RETURN)) | |
2928 | fc->flags |= CMD_IGNORE_RETURN; | |
726f6388 JA |
2929 | } |
2930 | else | |
2931 | fc = tc; | |
2932 | ||
2933 | return_catch_flag++; | |
2934 | return_val = setjmp (return_catch); | |
2935 | ||
2936 | if (return_val) | |
2937 | result = return_catch_value; | |
2938 | else | |
2939 | result = execute_command_internal (fc, 0, NO_PIPE, NO_PIPE, fds_to_close); | |
2940 | ||
ccc6cda3 | 2941 | if (subshell == 0) |
726f6388 JA |
2942 | run_unwind_frame ("function_calling"); |
2943 | ||
bb70624e JA |
2944 | if (variable_context == 0 || this_shell_function == 0) |
2945 | make_funcname_visible (0); | |
2946 | ||
726f6388 JA |
2947 | return (result); |
2948 | } | |
2949 | ||
bb70624e JA |
2950 | /* A convenience routine for use by other parts of the shell to execute |
2951 | a particular shell function. */ | |
2952 | int | |
2953 | execute_shell_function (var, words) | |
2954 | SHELL_VAR *var; | |
2955 | WORD_LIST *words; | |
2956 | { | |
2957 | int ret; | |
2958 | struct fd_bitmap *bitmap; | |
2959 | ||
2960 | bitmap = new_fd_bitmap (FD_BITMAP_DEFAULT_SIZE); | |
2961 | begin_unwind_frame ("execute-shell-function"); | |
2962 | add_unwind_protect (dispose_fd_bitmap, (char *)bitmap); | |
2963 | ||
2964 | ret = execute_function (var, words, 0, bitmap, 0, 0); | |
2965 | ||
2966 | dispose_fd_bitmap (bitmap); | |
2967 | discard_unwind_frame ("execute-shell-function"); | |
2968 | ||
2969 | return ret; | |
2970 | } | |
2971 | ||
726f6388 JA |
2972 | /* Execute a shell builtin or function in a subshell environment. This |
2973 | routine does not return; it only calls exit(). If BUILTIN is non-null, | |
2974 | it points to a function to call to execute a shell builtin; otherwise | |
2975 | VAR points at the body of a function to execute. WORDS is the arguments | |
2976 | to the command, REDIRECTS specifies redirections to perform before the | |
2977 | command is executed. */ | |
2978 | static void | |
2979 | execute_subshell_builtin_or_function (words, redirects, builtin, var, | |
2980 | pipe_in, pipe_out, async, fds_to_close, | |
2981 | flags) | |
2982 | WORD_LIST *words; | |
2983 | REDIRECT *redirects; | |
f73dda09 | 2984 | sh_builtin_func_t *builtin; |
726f6388 JA |
2985 | SHELL_VAR *var; |
2986 | int pipe_in, pipe_out, async; | |
2987 | struct fd_bitmap *fds_to_close; | |
2988 | int flags; | |
2989 | { | |
bb70624e JA |
2990 | int result, r; |
2991 | #if defined (JOB_CONTROL) | |
2992 | int jobs_hack; | |
726f6388 | 2993 | |
b72432fd JA |
2994 | jobs_hack = (builtin == jobs_builtin) && |
2995 | ((subshell_environment & SUBSHELL_ASYNC) == 0 || pipe_out != NO_PIPE); | |
bb70624e JA |
2996 | #endif |
2997 | ||
2998 | /* A subshell is neither a login shell nor interactive. */ | |
2999 | login_shell = interactive = 0; | |
b72432fd | 3000 | |
ccc6cda3 | 3001 | subshell_environment = SUBSHELL_ASYNC; |
726f6388 | 3002 | |
ccc6cda3 | 3003 | maybe_make_export_env (); /* XXX - is this needed? */ |
726f6388 JA |
3004 | |
3005 | #if defined (JOB_CONTROL) | |
3006 | /* Eradicate all traces of job control after we fork the subshell, so | |
3007 | all jobs begun by this subshell are in the same process group as | |
3008 | the shell itself. */ | |
3009 | ||
3010 | /* Allow the output of `jobs' to be piped. */ | |
b72432fd | 3011 | if (jobs_hack) |
726f6388 JA |
3012 | kill_current_pipeline (); |
3013 | else | |
3014 | without_job_control (); | |
3015 | ||
3016 | set_sigchld_handler (); | |
3017 | #endif /* JOB_CONTROL */ | |
3018 | ||
3019 | set_sigint_handler (); | |
3020 | ||
726f6388 JA |
3021 | if (fds_to_close) |
3022 | close_fd_bitmap (fds_to_close); | |
3023 | ||
bb70624e JA |
3024 | do_piping (pipe_in, pipe_out); |
3025 | ||
726f6388 JA |
3026 | if (do_redirections (redirects, 1, 0, 0) != 0) |
3027 | exit (EXECUTION_FAILURE); | |
3028 | ||
3029 | if (builtin) | |
3030 | { | |
726f6388 JA |
3031 | /* Give builtins a place to jump back to on failure, |
3032 | so we don't go back up to main(). */ | |
3033 | result = setjmp (top_level); | |
3034 | ||
3035 | if (result == EXITPROG) | |
3036 | exit (last_command_exit_value); | |
3037 | else if (result) | |
3038 | exit (EXECUTION_FAILURE); | |
3039 | else | |
cce855bc JA |
3040 | { |
3041 | r = execute_builtin (builtin, words, flags, 1); | |
3042 | if (r == EX_USAGE) | |
3043 | r = EX_BADUSAGE; | |
3044 | exit (r); | |
3045 | } | |
726f6388 JA |
3046 | } |
3047 | else | |
ccc6cda3 | 3048 | exit (execute_function (var, words, flags, fds_to_close, async, 1)); |
726f6388 JA |
3049 | } |
3050 | ||
3051 | /* Execute a builtin or function in the current shell context. If BUILTIN | |
3052 | is non-null, it is the builtin command to execute, otherwise VAR points | |
3053 | to the body of a function. WORDS are the command's arguments, REDIRECTS | |
3054 | are the redirections to perform. FDS_TO_CLOSE is the usual bitmap of | |
3055 | file descriptors to close. | |
3056 | ||
3057 | If BUILTIN is exec_builtin, the redirections specified in REDIRECTS are | |
3058 | not undone before this function returns. */ | |
3059 | static int | |
3060 | execute_builtin_or_function (words, builtin, var, redirects, | |
3061 | fds_to_close, flags) | |
3062 | WORD_LIST *words; | |
f73dda09 | 3063 | sh_builtin_func_t *builtin; |
726f6388 JA |
3064 | SHELL_VAR *var; |
3065 | REDIRECT *redirects; | |
3066 | struct fd_bitmap *fds_to_close; | |
3067 | int flags; | |
3068 | { | |
ccc6cda3 | 3069 | int result; |
726f6388 | 3070 | REDIRECT *saved_undo_list; |
f73dda09 | 3071 | sh_builtin_func_t *saved_this_shell_builtin; |
726f6388 JA |
3072 | |
3073 | if (do_redirections (redirects, 1, 1, 0) != 0) | |
3074 | { | |
3075 | cleanup_redirects (redirection_undo_list); | |
3076 | redirection_undo_list = (REDIRECT *)NULL; | |
3077 | dispose_exec_redirects (); | |
ccc6cda3 | 3078 | return (EX_REDIRFAIL); /* was EXECUTION_FAILURE */ |
726f6388 JA |
3079 | } |
3080 | ||
28ef6c31 | 3081 | saved_this_shell_builtin = this_shell_builtin; |
726f6388 JA |
3082 | saved_undo_list = redirection_undo_list; |
3083 | ||
3084 | /* Calling the "exec" builtin changes redirections forever. */ | |
3085 | if (builtin == exec_builtin) | |
3086 | { | |
3087 | dispose_redirects (saved_undo_list); | |
3088 | saved_undo_list = exec_redirection_undo_list; | |
3089 | exec_redirection_undo_list = (REDIRECT *)NULL; | |
3090 | } | |
3091 | else | |
3092 | dispose_exec_redirects (); | |
3093 | ||
3094 | if (saved_undo_list) | |
3095 | { | |
3096 | begin_unwind_frame ("saved redirects"); | |
ccc6cda3 | 3097 | add_unwind_protect (cleanup_redirects, (char *)saved_undo_list); |
726f6388 JA |
3098 | } |
3099 | ||
3100 | redirection_undo_list = (REDIRECT *)NULL; | |
3101 | ||
3102 | if (builtin) | |
3103 | result = execute_builtin (builtin, words, flags, 0); | |
3104 | else | |
3105 | result = execute_function (var, words, flags, fds_to_close, 0, 0); | |
3106 | ||
28ef6c31 JA |
3107 | /* If we are executing the `command' builtin, but this_shell_builtin is |
3108 | set to `exec_builtin', we know that we have something like | |
3109 | `command exec [redirection]', since otherwise `exec' would have | |
3110 | overwritten the shell and we wouldn't get here. In this case, we | |
3111 | want to behave as if the `command' builtin had not been specified | |
3112 | and preserve the redirections. */ | |
3113 | if (builtin == command_builtin && this_shell_builtin == exec_builtin) | |
3114 | { | |
3115 | if (saved_undo_list) | |
3116 | dispose_redirects (saved_undo_list); | |
3117 | redirection_undo_list = exec_redirection_undo_list; | |
3118 | saved_undo_list = exec_redirection_undo_list = (REDIRECT *)NULL; | |
3119 | discard_unwind_frame ("saved_redirects"); | |
3120 | } | |
3121 | ||
726f6388 JA |
3122 | if (saved_undo_list) |
3123 | { | |
3124 | redirection_undo_list = saved_undo_list; | |
3125 | discard_unwind_frame ("saved redirects"); | |
3126 | } | |
3127 | ||
3128 | if (redirection_undo_list) | |
3129 | { | |
ccc6cda3 | 3130 | cleanup_redirects (redirection_undo_list); |
726f6388 JA |
3131 | redirection_undo_list = (REDIRECT *)NULL; |
3132 | } | |
3133 | ||
3134 | return (result); | |
3135 | } | |
3136 | ||
3137 | void | |
3138 | setup_async_signals () | |
3139 | { | |
b72432fd JA |
3140 | #if defined (__BEOS__) |
3141 | set_signal_handler (SIGHUP, SIG_IGN); /* they want csh-like behavior */ | |
3142 | #endif | |
3143 | ||
726f6388 JA |
3144 | #if defined (JOB_CONTROL) |
3145 | if (job_control == 0) | |
3146 | #endif | |
3147 | { | |
3148 | set_signal_handler (SIGINT, SIG_IGN); | |
3149 | set_signal_ignored (SIGINT); | |
3150 | set_signal_handler (SIGQUIT, SIG_IGN); | |
3151 | set_signal_ignored (SIGQUIT); | |
3152 | } | |
3153 | } | |
3154 | ||
3155 | /* Execute a simple command that is hopefully defined in a disk file | |
3156 | somewhere. | |
3157 | ||
3158 | 1) fork () | |
3159 | 2) connect pipes | |
3160 | 3) look up the command | |
3161 | 4) do redirections | |
3162 | 5) execve () | |
3163 | 6) If the execve failed, see if the file has executable mode set. | |
3164 | If so, and it isn't a directory, then execute its contents as | |
3165 | a shell script. | |
3166 | ||
3167 | Note that the filename hashing stuff has to take place up here, | |
3168 | in the parent. This is probably why the Bourne style shells | |
3169 | don't handle it, since that would require them to go through | |
3170 | this gnarly hair, for no good reason. */ | |
3171 | static void | |
3172 | execute_disk_command (words, redirects, command_line, pipe_in, pipe_out, | |
d166f048 | 3173 | async, fds_to_close, cmdflags) |
726f6388 JA |
3174 | WORD_LIST *words; |
3175 | REDIRECT *redirects; | |
3176 | char *command_line; | |
3177 | int pipe_in, pipe_out, async; | |
3178 | struct fd_bitmap *fds_to_close; | |
d166f048 | 3179 | int cmdflags; |
726f6388 | 3180 | { |
ccc6cda3 | 3181 | char *pathname, *command, **args; |
d166f048 | 3182 | int nofork; |
bb70624e | 3183 | pid_t pid; |
726f6388 | 3184 | |
d166f048 | 3185 | nofork = (cmdflags & CMD_NO_FORK); /* Don't fork, just exec, if no pipes */ |
726f6388 | 3186 | pathname = words->word->word; |
ccc6cda3 | 3187 | |
726f6388 | 3188 | #if defined (RESTRICTED_SHELL) |
7117c2d2 | 3189 | if (restricted && xstrchr (pathname, '/')) |
726f6388 | 3190 | { |
ccc6cda3 | 3191 | internal_error ("%s: restricted: cannot specify `/' in command names", |
726f6388 JA |
3192 | pathname); |
3193 | last_command_exit_value = EXECUTION_FAILURE; | |
3194 | return; | |
3195 | } | |
3196 | #endif /* RESTRICTED_SHELL */ | |
3197 | ||
ccc6cda3 | 3198 | command = search_for_command (pathname); |
726f6388 | 3199 | |
ccc6cda3 | 3200 | if (command) |
726f6388 | 3201 | { |
ccc6cda3 JA |
3202 | maybe_make_export_env (); |
3203 | put_command_name_into_env (command); | |
726f6388 JA |
3204 | } |
3205 | ||
bb70624e | 3206 | /* We have to make the child before we check for the non-existence |
726f6388 JA |
3207 | of COMMAND, since we want the error messages to be redirected. */ |
3208 | /* If we can get away without forking and there are no pipes to deal with, | |
3209 | don't bother to fork, just directly exec the command. */ | |
3210 | if (nofork && pipe_in == NO_PIPE && pipe_out == NO_PIPE) | |
3211 | pid = 0; | |
3212 | else | |
3213 | pid = make_child (savestring (command_line), async); | |
3214 | ||
3215 | if (pid == 0) | |
3216 | { | |
3217 | int old_interactive; | |
3218 | ||
d166f048 JA |
3219 | #if 0 |
3220 | /* This has been disabled for the time being. */ | |
ccc6cda3 JA |
3221 | #if !defined (ARG_MAX) || ARG_MAX >= 10240 |
3222 | if (posixly_correct == 0) | |
f73dda09 | 3223 | put_gnu_argv_flags_into_env ((long)getpid (), glob_argv_flags); |
d166f048 | 3224 | #endif |
ccc6cda3 JA |
3225 | #endif |
3226 | ||
726f6388 JA |
3227 | /* Cancel traps, in trap.c. */ |
3228 | restore_original_signals (); | |
3229 | ||
3230 | /* restore_original_signals may have undone the work done | |
cce855bc JA |
3231 | by make_child to ensure that SIGINT and SIGQUIT are ignored |
3232 | in asynchronous children. */ | |
726f6388 | 3233 | if (async) |
d166f048 JA |
3234 | { |
3235 | if ((cmdflags & CMD_STDIN_REDIR) && | |
3236 | pipe_in == NO_PIPE && | |
3237 | (stdin_redirects (redirects) == 0)) | |
3238 | async_redirect_stdin (); | |
3239 | setup_async_signals (); | |
3240 | } | |
726f6388 | 3241 | |
bb70624e JA |
3242 | /* This functionality is now provided by close-on-exec of the |
3243 | file descriptors manipulated by redirection and piping. | |
3244 | Some file descriptors still need to be closed in all children | |
3245 | because of the way bash does pipes; fds_to_close is a | |
3246 | bitmap of all such file descriptors. */ | |
3247 | if (fds_to_close) | |
3248 | close_fd_bitmap (fds_to_close); | |
3249 | ||
726f6388 JA |
3250 | do_piping (pipe_in, pipe_out); |
3251 | ||
f73dda09 | 3252 | old_interactive = interactive; |
726f6388 | 3253 | if (async) |
f73dda09 | 3254 | interactive = 0; |
726f6388 | 3255 | |
ccc6cda3 | 3256 | subshell_environment = SUBSHELL_FORK; |
726f6388 | 3257 | |
726f6388 JA |
3258 | if (redirects && (do_redirections (redirects, 1, 0, 0) != 0)) |
3259 | { | |
3260 | #if defined (PROCESS_SUBSTITUTION) | |
3261 | /* Try to remove named pipes that may have been created as the | |
3262 | result of redirections. */ | |
3263 | unlink_fifo_list (); | |
3264 | #endif /* PROCESS_SUBSTITUTION */ | |
3265 | exit (EXECUTION_FAILURE); | |
3266 | } | |
3267 | ||
3268 | if (async) | |
3269 | interactive = old_interactive; | |
3270 | ||
ccc6cda3 | 3271 | if (command == 0) |
726f6388 | 3272 | { |
ccc6cda3 | 3273 | internal_error ("%s: command not found", pathname); |
726f6388 JA |
3274 | exit (EX_NOTFOUND); /* Posix.2 says the exit status is 127 */ |
3275 | } | |
3276 | ||
ccc6cda3 JA |
3277 | /* Execve expects the command name to be in args[0]. So we |
3278 | leave it there, in the same format that the user used to | |
3279 | type it in. */ | |
7117c2d2 | 3280 | args = strvec_from_word_list (words, 0, 0, (int *)NULL); |
726f6388 JA |
3281 | exit (shell_execve (command, args, export_env)); |
3282 | } | |
3283 | else | |
3284 | { | |
3285 | /* Make sure that the pipes are closed in the parent. */ | |
3286 | close_pipes (pipe_in, pipe_out); | |
3287 | #if defined (PROCESS_SUBSTITUTION) && defined (HAVE_DEV_FD) | |
3288 | unlink_fifo_list (); | |
3289 | #endif | |
3290 | FREE (command); | |
3291 | } | |
3292 | } | |
3293 | ||
28ef6c31 JA |
3294 | /* CPP defines to decide whether a particular index into the #! line |
3295 | corresponds to a valid interpreter name or argument character, or | |
3296 | whitespace. The MSDOS define is to allow \r to be treated the same | |
3297 | as \n. */ | |
3298 | ||
3299 | #if !defined (MSDOS) | |
3300 | # define STRINGCHAR(ind) \ | |
f73dda09 | 3301 | (ind < sample_len && !whitespace (sample[ind]) && sample[ind] != '\n') |
28ef6c31 | 3302 | # define WHITECHAR(ind) \ |
f73dda09 | 3303 | (ind < sample_len && whitespace (sample[ind])) |
28ef6c31 JA |
3304 | #else /* MSDOS */ |
3305 | # define STRINGCHAR(ind) \ | |
f73dda09 | 3306 | (ind < sample_len && !whitespace (sample[ind]) && sample[ind] != '\n' && sample[ind] != '\r') |
28ef6c31 | 3307 | # define WHITECHAR(ind) \ |
f73dda09 | 3308 | (ind < sample_len && whitespace (sample[ind])) |
28ef6c31 JA |
3309 | #endif /* MSDOS */ |
3310 | ||
f73dda09 JA |
3311 | static char * |
3312 | getinterp (sample, sample_len, endp) | |
3313 | char *sample; | |
3314 | int sample_len, *endp; | |
726f6388 JA |
3315 | { |
3316 | register int i; | |
f73dda09 JA |
3317 | char *execname; |
3318 | int start; | |
726f6388 JA |
3319 | |
3320 | /* Find the name of the interpreter to exec. */ | |
f73dda09 | 3321 | for (i = 2; i < sample_len && whitespace (sample[i]); i++) |
726f6388 JA |
3322 | ; |
3323 | ||
28ef6c31 | 3324 | for (start = i; STRINGCHAR(i); i++) |
726f6388 JA |
3325 | ; |
3326 | ||
f73dda09 JA |
3327 | execname = substring (sample, start, i); |
3328 | ||
3329 | if (endp) | |
3330 | *endp = i; | |
3331 | return execname; | |
3332 | } | |
3333 | ||
3334 | #if !defined (HAVE_HASH_BANG_EXEC) | |
3335 | /* If the operating system on which we're running does not handle | |
3336 | the #! executable format, then help out. SAMPLE is the text read | |
3337 | from the file, SAMPLE_LEN characters. COMMAND is the name of | |
3338 | the script; it and ARGS, the arguments given by the user, will | |
3339 | become arguments to the specified interpreter. ENV is the environment | |
3340 | to pass to the interpreter. | |
3341 | ||
3342 | The word immediately following the #! is the interpreter to execute. | |
3343 | A single argument to the interpreter is allowed. */ | |
3344 | ||
3345 | static int | |
3346 | execute_shell_script (sample, sample_len, command, args, env) | |
3347 | char *sample; | |
3348 | int sample_len; | |
3349 | char *command; | |
3350 | char **args, **env; | |
3351 | { | |
3352 | char *execname, *firstarg; | |
3353 | int i, start, size_increment, larry; | |
3354 | ||
3355 | /* Find the name of the interpreter to exec. */ | |
3356 | execname = getinterp (sample, sample_len, &i); | |
726f6388 JA |
3357 | size_increment = 1; |
3358 | ||
3359 | /* Now the argument, if any. */ | |
28ef6c31 | 3360 | for (firstarg = (char *)NULL, start = i; WHITECHAR(i); i++) |
726f6388 JA |
3361 | ; |
3362 | ||
3363 | /* If there is more text on the line, then it is an argument for the | |
3364 | interpreter. */ | |
28ef6c31 JA |
3365 | |
3366 | if (STRINGCHAR(i)) | |
726f6388 | 3367 | { |
28ef6c31 | 3368 | for (start = i; STRINGCHAR(i); i++) |
726f6388 | 3369 | ; |
bb70624e | 3370 | firstarg = substring ((char *)sample, start, i); |
726f6388 JA |
3371 | size_increment = 2; |
3372 | } | |
3373 | ||
7117c2d2 JA |
3374 | larry = strvec_len (args) + size_increment; |
3375 | args = strvec_resize (args, larry + 1); | |
726f6388 JA |
3376 | |
3377 | for (i = larry - 1; i; i--) | |
3378 | args[i] = args[i - size_increment]; | |
3379 | ||
3380 | args[0] = execname; | |
3381 | if (firstarg) | |
3382 | { | |
3383 | args[1] = firstarg; | |
3384 | args[2] = command; | |
3385 | } | |
3386 | else | |
3387 | args[1] = command; | |
3388 | ||
3389 | args[larry] = (char *)NULL; | |
3390 | ||
3391 | return (shell_execve (execname, args, env)); | |
3392 | } | |
28ef6c31 JA |
3393 | #undef STRINGCHAR |
3394 | #undef WHITECHAR | |
3395 | ||
ccc6cda3 JA |
3396 | #endif /* !HAVE_HASH_BANG_EXEC */ |
3397 | ||
d166f048 JA |
3398 | static void |
3399 | initialize_subshell () | |
3400 | { | |
3401 | #if defined (ALIAS) | |
3402 | /* Forget about any aliases that we knew of. We are in a subshell. */ | |
3403 | delete_all_aliases (); | |
3404 | #endif /* ALIAS */ | |
3405 | ||
3406 | #if defined (HISTORY) | |
3407 | /* Forget about the history lines we have read. This is a non-interactive | |
3408 | subshell. */ | |
3409 | history_lines_this_session = 0; | |
3410 | #endif | |
3411 | ||
3412 | #if defined (JOB_CONTROL) | |
3413 | /* Forget about the way job control was working. We are in a subshell. */ | |
3414 | without_job_control (); | |
3415 | set_sigchld_handler (); | |
3416 | #endif /* JOB_CONTROL */ | |
3417 | ||
3418 | /* Reset the values of the shell flags and options. */ | |
3419 | reset_shell_flags (); | |
3420 | reset_shell_options (); | |
3421 | reset_shopt_options (); | |
3422 | ||
28ef6c31 JA |
3423 | /* Zero out builtin_env, since this could be a shell script run from a |
3424 | sourced file with a temporary environment supplied to the `source/.' | |
3425 | builtin. Such variables are not supposed to be exported (empirical | |
7117c2d2 JA |
3426 | testing with sh and ksh). Just throw it away; don't worry about a |
3427 | memory leak. */ | |
3428 | if (vc_isbltnenv (shell_variables)) | |
3429 | shell_variables = shell_variables->down; | |
28ef6c31 JA |
3430 | |
3431 | clear_unwind_protect_list (0); | |
3432 | ||
3433 | /* We're no longer inside a shell function. */ | |
3434 | variable_context = return_catch_flag = 0; | |
3435 | ||
d166f048 JA |
3436 | /* If we're not interactive, close the file descriptor from which we're |
3437 | reading the current shell script. */ | |
cce855bc JA |
3438 | if (interactive_shell == 0) |
3439 | unset_bash_input (1); | |
d166f048 JA |
3440 | } |
3441 | ||
ccc6cda3 JA |
3442 | #if defined (HAVE_SETOSTYPE) && defined (_POSIX_SOURCE) |
3443 | # define SETOSTYPE(x) __setostype(x) | |
3444 | #else | |
3445 | # define SETOSTYPE(x) | |
3446 | #endif | |
726f6388 | 3447 | |
28ef6c31 JA |
3448 | #define READ_SAMPLE_BUF(file, buf, len) \ |
3449 | do \ | |
3450 | { \ | |
3451 | fd = open(file, O_RDONLY); \ | |
3452 | if (fd >= 0) \ | |
3453 | { \ | |
f73dda09 | 3454 | len = read (fd, buf, 80); \ |
28ef6c31 JA |
3455 | close (fd); \ |
3456 | } \ | |
3457 | else \ | |
3458 | len = -1; \ | |
3459 | } \ | |
3460 | while (0) | |
3461 | ||
726f6388 JA |
3462 | /* Call execve (), handling interpreting shell scripts, and handling |
3463 | exec failures. */ | |
3464 | int | |
3465 | shell_execve (command, args, env) | |
3466 | char *command; | |
3467 | char **args, **env; | |
3468 | { | |
ccc6cda3 JA |
3469 | struct stat finfo; |
3470 | int larray, i, fd; | |
f73dda09 | 3471 | char sample[80]; |
28ef6c31 | 3472 | int sample_len; |
ccc6cda3 JA |
3473 | |
3474 | SETOSTYPE (0); /* Some systems use for USG/POSIX semantics */ | |
726f6388 | 3475 | execve (command, args, env); |
28ef6c31 | 3476 | i = errno; /* error from execve() */ |
ccc6cda3 | 3477 | SETOSTYPE (1); |
726f6388 JA |
3478 | |
3479 | /* If we get to this point, then start checking out the file. | |
3480 | Maybe it is something we can hack ourselves. */ | |
28ef6c31 | 3481 | if (i != ENOEXEC) |
ccc6cda3 | 3482 | { |
ccc6cda3 JA |
3483 | if ((stat (command, &finfo) == 0) && (S_ISDIR (finfo.st_mode))) |
3484 | internal_error ("%s: is a directory", command); | |
7117c2d2 JA |
3485 | else if (executable_file (command) == 0) |
3486 | { | |
3487 | errno = i; | |
3488 | file_error (command); | |
3489 | } | |
ccc6cda3 JA |
3490 | else |
3491 | { | |
7117c2d2 JA |
3492 | /* The file has the execute bits set, but the kernel refuses to |
3493 | run it for some reason. See why. */ | |
28ef6c31 JA |
3494 | #if defined (HAVE_HASH_BANG_EXEC) |
3495 | READ_SAMPLE_BUF (command, sample, sample_len); | |
3496 | if (sample_len > 2 && sample[0] == '#' && sample[1] == '!') | |
3497 | { | |
f73dda09 JA |
3498 | char *interp; |
3499 | ||
3500 | interp = getinterp (sample, sample_len, (int *)NULL); | |
28ef6c31 | 3501 | errno = i; |
f73dda09 JA |
3502 | sys_error ("%s: %s: bad interpreter", command, interp ? interp : ""); |
3503 | FREE (interp); | |
28ef6c31 JA |
3504 | return (EX_NOEXEC); |
3505 | } | |
3506 | #endif | |
ccc6cda3 | 3507 | errno = i; |
726f6388 | 3508 | file_error (command); |
ccc6cda3 | 3509 | } |
d166f048 | 3510 | return ((i == ENOENT) ? EX_NOTFOUND : EX_NOEXEC); /* XXX Posix.2 says that exit status is 126 */ |
ccc6cda3 | 3511 | } |
726f6388 | 3512 | |
ccc6cda3 JA |
3513 | /* This file is executable. |
3514 | If it begins with #!, then help out people with losing operating | |
3515 | systems. Otherwise, check to see if it is a binary file by seeing | |
28ef6c31 JA |
3516 | if the contents of the first line (or up to 80 characters) are in the |
3517 | ASCII set. If it's a text file, execute the contents as shell commands, | |
3518 | otherwise return 126 (EX_BINARY_FILE). */ | |
3519 | READ_SAMPLE_BUF (command, sample, sample_len); | |
ccc6cda3 | 3520 | |
28ef6c31 JA |
3521 | if (sample_len == 0) |
3522 | return (EXECUTION_SUCCESS); | |
ccc6cda3 | 3523 | |
28ef6c31 JA |
3524 | /* Is this supposed to be an executable script? |
3525 | If so, the format of the line is "#! interpreter [argument]". | |
3526 | A single argument is allowed. The BSD kernel restricts | |
3527 | the length of the entire line to 32 characters (32 bytes | |
3528 | being the size of the BSD exec header), but we allow 80 | |
3529 | characters. */ | |
3530 | if (sample_len > 0) | |
3531 | { | |
ccc6cda3 | 3532 | #if !defined (HAVE_HASH_BANG_EXEC) |
28ef6c31 JA |
3533 | if (sample_len > 2 && sample[0] == '#' && sample[1] == '!') |
3534 | return (execute_shell_script (sample, sample_len, command, args, env)); | |
3535 | else | |
ccc6cda3 | 3536 | #endif |
28ef6c31 JA |
3537 | if (check_binary_file (sample, sample_len)) |
3538 | { | |
3539 | internal_error ("%s: cannot execute binary file", command); | |
3540 | return (EX_BINARY_FILE); | |
726f6388 | 3541 | } |
ccc6cda3 JA |
3542 | } |
3543 | ||
28ef6c31 JA |
3544 | /* We have committed to attempting to execute the contents of this file |
3545 | as shell commands. */ | |
3546 | ||
d166f048 | 3547 | initialize_subshell (); |
726f6388 | 3548 | |
ccc6cda3 | 3549 | set_sigint_handler (); |
726f6388 | 3550 | |
ccc6cda3 | 3551 | /* Insert the name of this shell into the argument list. */ |
7117c2d2 JA |
3552 | larray = strvec_len (args) + 1; |
3553 | args = strvec_resize (args, larray + 1); | |
726f6388 | 3554 | |
ccc6cda3 JA |
3555 | for (i = larray - 1; i; i--) |
3556 | args[i] = args[i - 1]; | |
726f6388 | 3557 | |
ccc6cda3 JA |
3558 | args[0] = shell_name; |
3559 | args[1] = command; | |
3560 | args[larray] = (char *)NULL; | |
726f6388 | 3561 | |
ccc6cda3 JA |
3562 | if (args[0][0] == '-') |
3563 | args[0]++; | |
726f6388 | 3564 | |
ccc6cda3 JA |
3565 | #if defined (RESTRICTED_SHELL) |
3566 | if (restricted) | |
3567 | change_flag ('r', FLAG_OFF); | |
3568 | #endif | |
726f6388 | 3569 | |
ccc6cda3 JA |
3570 | if (subshell_argv) |
3571 | { | |
3572 | /* Can't free subshell_argv[0]; that is shell_name. */ | |
3573 | for (i = 1; i < subshell_argc; i++) | |
3574 | free (subshell_argv[i]); | |
3575 | free (subshell_argv); | |
3576 | } | |
3577 | ||
3578 | dispose_command (currently_executing_command); /* XXX */ | |
3579 | currently_executing_command = (COMMAND *)NULL; | |
3580 | ||
3581 | subshell_argc = larray; | |
3582 | subshell_argv = args; | |
3583 | subshell_envp = env; | |
3584 | ||
3585 | unbind_args (); /* remove the positional parameters */ | |
3586 | ||
3587 | longjmp (subshell_top_level, 1); | |
f73dda09 | 3588 | /*NOTREACHED*/ |
ccc6cda3 JA |
3589 | } |
3590 | ||
3591 | static int | |
3592 | execute_intern_function (name, function) | |
3593 | WORD_DESC *name; | |
3594 | COMMAND *function; | |
3595 | { | |
3596 | SHELL_VAR *var; | |
3597 | ||
3598 | if (check_identifier (name, posixly_correct) == 0) | |
3599 | { | |
3600 | if (posixly_correct && interactive_shell == 0) | |
3601 | { | |
3602 | last_command_exit_value = EX_USAGE; | |
3603 | jump_to_top_level (EXITPROG); | |
3604 | } | |
3605 | return (EXECUTION_FAILURE); | |
3606 | } | |
3607 | ||
3608 | var = find_function (name->word); | |
28ef6c31 | 3609 | if (var && (readonly_p (var) || noassign_p (var))) |
ccc6cda3 | 3610 | { |
28ef6c31 JA |
3611 | if (readonly_p (var)) |
3612 | internal_error ("%s: readonly function", var->name); | |
ccc6cda3 JA |
3613 | return (EXECUTION_FAILURE); |
3614 | } | |
3615 | ||
3616 | bind_function (name->word, function); | |
3617 | return (EXECUTION_SUCCESS); | |
726f6388 JA |
3618 | } |
3619 | ||
d166f048 | 3620 | #if defined (INCLUDE_UNUSED) |
726f6388 | 3621 | #if defined (PROCESS_SUBSTITUTION) |
726f6388 JA |
3622 | void |
3623 | close_all_files () | |
3624 | { | |
3625 | register int i, fd_table_size; | |
3626 | ||
3627 | fd_table_size = getdtablesize (); | |
3628 | if (fd_table_size > 256) /* clamp to a reasonable value */ | |
7117c2d2 | 3629 | fd_table_size = 256; |
726f6388 JA |
3630 | |
3631 | for (i = 3; i < fd_table_size; i++) | |
3632 | close (i); | |
3633 | } | |
3634 | #endif /* PROCESS_SUBSTITUTION */ | |
d166f048 | 3635 | #endif |
726f6388 JA |
3636 | |
3637 | static void | |
3638 | close_pipes (in, out) | |
3639 | int in, out; | |
3640 | { | |
3641 | if (in >= 0) | |
3642 | close (in); | |
3643 | if (out >= 0) | |
3644 | close (out); | |
3645 | } | |
3646 | ||
3647 | /* Redirect input and output to be from and to the specified pipes. | |
3648 | NO_PIPE and REDIRECT_BOTH are handled correctly. */ | |
3649 | static void | |
3650 | do_piping (pipe_in, pipe_out) | |
3651 | int pipe_in, pipe_out; | |
3652 | { | |
3653 | if (pipe_in != NO_PIPE) | |
3654 | { | |
3655 | if (dup2 (pipe_in, 0) < 0) | |
ccc6cda3 | 3656 | sys_error ("cannot duplicate fd %d to fd 0", pipe_in); |
726f6388 | 3657 | if (pipe_in > 0) |
cce855bc | 3658 | close (pipe_in); |
726f6388 JA |
3659 | } |
3660 | if (pipe_out != NO_PIPE) | |
3661 | { | |
3662 | if (pipe_out != REDIRECT_BOTH) | |
3663 | { | |
3664 | if (dup2 (pipe_out, 1) < 0) | |
ccc6cda3 | 3665 | sys_error ("cannot duplicate fd %d to fd 1", pipe_out); |
726f6388 JA |
3666 | if (pipe_out == 0 || pipe_out > 1) |
3667 | close (pipe_out); | |
3668 | } | |
3669 | else | |
ccc6cda3 | 3670 | { |
cce855bc JA |
3671 | if (dup2 (1, 2) < 0) |
3672 | sys_error ("cannot duplicate fd 1 to fd 2"); | |
ccc6cda3 | 3673 | } |
d166f048 | 3674 | } |
726f6388 | 3675 | } |