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Commit | Line | Data |
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726f6388 JA |
1 | /* The thing that makes children, remembers them, and contains wait loops. */ |
2 | ||
ccc6cda3 JA |
3 | /* This file works under BSD, System V, minix, and Posix systems. It does |
4 | not implement job control. */ | |
726f6388 | 5 | |
0628567a | 6 | /* Copyright (C) 1987-2006 Free Software Foundation, Inc. |
726f6388 JA |
7 | |
8 | This file is part of GNU Bash, the Bourne Again SHell. | |
9 | ||
10 | Bash is free software; you can redistribute it and/or modify it under | |
11 | the terms of the GNU General Public License as published by the Free | |
bb70624e | 12 | Software Foundation; either version 2, or (at your option) any later |
726f6388 JA |
13 | version. |
14 | ||
15 | Bash is distributed in the hope that it will be useful, but WITHOUT ANY | |
16 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
17 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
18 | for more details. | |
19 | ||
20 | You should have received a copy of the GNU General Public License along | |
21 | with Bash; see the file COPYING. If not, write to the Free Software | |
bb70624e | 22 | Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */ |
726f6388 | 23 | |
ccc6cda3 JA |
24 | #include "config.h" |
25 | ||
726f6388 | 26 | #include "bashtypes.h" |
ccc6cda3 JA |
27 | #include "filecntl.h" |
28 | ||
29 | #if defined (HAVE_UNISTD_H) | |
30 | # include <unistd.h> | |
31 | #endif | |
32 | ||
33 | #include <stdio.h> | |
726f6388 | 34 | #include <signal.h> |
726f6388 JA |
35 | #include <errno.h> |
36 | ||
726f6388 JA |
37 | #if defined (BUFFERED_INPUT) |
38 | # include "input.h" | |
39 | #endif | |
40 | ||
bb70624e JA |
41 | /* Need to include this up here for *_TTY_DRIVER definitions. */ |
42 | #include "shtty.h" | |
ccc6cda3 | 43 | |
b80f6443 JA |
44 | #include "bashintl.h" |
45 | ||
bb70624e JA |
46 | #include "shell.h" |
47 | #include "jobs.h" | |
48 | ||
49 | #include "builtins/builtext.h" /* for wait_builtin */ | |
50 | ||
7117c2d2 | 51 | #define DEFAULT_CHILD_MAX 32 |
bb70624e | 52 | |
ccc6cda3 | 53 | #if defined (_POSIX_VERSION) || !defined (HAVE_KILLPG) |
726f6388 JA |
54 | # define killpg(pg, sig) kill(-(pg),(sig)) |
55 | #endif /* USG || _POSIX_VERSION */ | |
56 | ||
b80f6443 | 57 | #if !defined (HAVE_SIGINTERRUPT) && !defined (HAVE_POSIX_SIGNALS) |
726f6388 | 58 | # define siginterrupt(sig, code) |
b80f6443 | 59 | #endif /* !HAVE_SIGINTERRUPT && !HAVE_POSIX_SIGNALS */ |
726f6388 | 60 | |
ccc6cda3 | 61 | #if defined (HAVE_WAITPID) |
726f6388 JA |
62 | # define WAITPID(pid, statusp, options) waitpid (pid, statusp, options) |
63 | #else | |
64 | # define WAITPID(pid, statusp, options) wait (statusp) | |
ccc6cda3 | 65 | #endif /* !HAVE_WAITPID */ |
726f6388 | 66 | |
d166f048 JA |
67 | /* Return the fd from which we are actually getting input. */ |
68 | #define input_tty() (shell_tty != -1) ? shell_tty : fileno (stderr) | |
69 | ||
726f6388 JA |
70 | #if !defined (errno) |
71 | extern int errno; | |
72 | #endif /* !errno */ | |
73 | ||
74 | extern int interactive, interactive_shell, login_shell; | |
75 | extern int subshell_environment; | |
b80f6443 | 76 | extern int last_command_exit_value, last_command_exit_signal; |
bb70624e | 77 | extern int interrupt_immediately; |
f73dda09 | 78 | extern sh_builtin_func_t *this_shell_builtin; |
ccc6cda3 | 79 | #if defined (HAVE_POSIX_SIGNALS) |
726f6388 JA |
80 | extern sigset_t top_level_mask; |
81 | #endif | |
bb70624e | 82 | extern procenv_t wait_intr_buf; |
7117c2d2 | 83 | extern int wait_signal_received; |
726f6388 JA |
84 | |
85 | pid_t last_made_pid = NO_PID; | |
86 | pid_t last_asynchronous_pid = NO_PID; | |
87 | ||
88 | /* Call this when you start making children. */ | |
89 | int already_making_children = 0; | |
90 | ||
d166f048 JA |
91 | /* The controlling tty for this shell. */ |
92 | int shell_tty = -1; | |
93 | ||
ccc6cda3 JA |
94 | /* If this is non-zero, $LINES and $COLUMNS are reset after every process |
95 | exits from get_tty_state(). */ | |
96 | int check_window_size; | |
97 | ||
bb70624e JA |
98 | /* STATUS and FLAGS are only valid if pid != NO_PID |
99 | STATUS is only valid if (flags & PROC_RUNNING) == 0 */ | |
726f6388 JA |
100 | struct proc_status { |
101 | pid_t pid; | |
102 | int status; /* Exit status of PID or 128 + fatal signal number */ | |
bb70624e | 103 | int flags; |
726f6388 JA |
104 | }; |
105 | ||
bb70624e JA |
106 | /* Values for proc_status.flags */ |
107 | #define PROC_RUNNING 0x01 | |
108 | #define PROC_NOTIFIED 0x02 | |
109 | #define PROC_ASYNC 0x04 | |
b80f6443 | 110 | #define PROC_SIGNALED 0x10 |
bb70624e | 111 | |
bb70624e JA |
112 | /* Return values from find_status_by_pid */ |
113 | #define PROC_BAD -1 | |
726f6388 JA |
114 | #define PROC_STILL_ALIVE -2 |
115 | ||
f73dda09 JA |
116 | static struct proc_status *pid_list = (struct proc_status *)NULL; |
117 | static int pid_list_size; | |
118 | static int wait_sigint_received; | |
119 | ||
7117c2d2 JA |
120 | static long child_max = -1L; |
121 | ||
f73dda09 JA |
122 | static void alloc_pid_list __P((void)); |
123 | static int find_proc_slot __P((void)); | |
124 | static int find_index_by_pid __P((pid_t)); | |
125 | static int find_status_by_pid __P((pid_t)); | |
126 | static int process_exit_status __P((WAIT)); | |
b80f6443 JA |
127 | static int find_termsig_by_pid __P((pid_t)); |
128 | static int get_termsig __P((WAIT)); | |
f73dda09 JA |
129 | static void set_pid_status __P((pid_t, WAIT)); |
130 | static void set_pid_flags __P((pid_t, int)); | |
131 | static void unset_pid_flags __P((pid_t, int)); | |
b80f6443 | 132 | static int get_pid_flags __P((pid_t)); |
f73dda09 JA |
133 | static void add_pid __P((pid_t, int)); |
134 | static void mark_dead_jobs_as_notified __P((int)); | |
135 | ||
7117c2d2 | 136 | static sighandler wait_sigint_handler __P((int)); |
b80f6443 | 137 | static char *j_strsignal __P((int)); |
f73dda09 JA |
138 | |
139 | #if defined (HAVE_WAITPID) | |
140 | static void reap_zombie_children __P((void)); | |
141 | #endif | |
142 | ||
b80f6443 JA |
143 | #if !defined (HAVE_SIGINTERRUPT) && defined (HAVE_POSIX_SIGNALS) |
144 | static int siginterrupt __P((int, int)); | |
145 | #endif | |
146 | ||
f73dda09 JA |
147 | static void restore_sigint_handler __P((void)); |
148 | ||
726f6388 JA |
149 | /* Allocate new, or grow existing PID_LIST. */ |
150 | static void | |
151 | alloc_pid_list () | |
152 | { | |
153 | register int i; | |
154 | int old = pid_list_size; | |
155 | ||
156 | pid_list_size += 10; | |
f73dda09 | 157 | pid_list = (struct proc_status *)xrealloc (pid_list, pid_list_size * sizeof (struct proc_status)); |
726f6388 JA |
158 | |
159 | /* None of the newly allocated slots have process id's yet. */ | |
160 | for (i = old; i < pid_list_size; i++) | |
ccc6cda3 | 161 | pid_list[i].pid = NO_PID; |
726f6388 JA |
162 | } |
163 | ||
164 | /* Return the offset within the PID_LIST array of an empty slot. This can | |
165 | create new slots if all of the existing slots are taken. */ | |
166 | static int | |
167 | find_proc_slot () | |
168 | { | |
169 | register int i; | |
170 | ||
171 | for (i = 0; i < pid_list_size; i++) | |
172 | if (pid_list[i].pid == NO_PID) | |
173 | return (i); | |
174 | ||
175 | if (i == pid_list_size) | |
176 | alloc_pid_list (); | |
177 | ||
178 | return (i); | |
179 | } | |
180 | ||
181 | /* Return the offset within the PID_LIST array of a slot containing PID, | |
182 | or the value NO_PID if the pid wasn't found. */ | |
183 | static int | |
184 | find_index_by_pid (pid) | |
185 | pid_t pid; | |
186 | { | |
187 | register int i; | |
188 | ||
189 | for (i = 0; i < pid_list_size; i++) | |
190 | if (pid_list[i].pid == pid) | |
191 | return (i); | |
192 | ||
193 | return (NO_PID); | |
194 | } | |
195 | ||
196 | /* Return the status of PID as looked up in the PID_LIST array. A | |
197 | return value of PROC_BAD indicates that PID wasn't found. */ | |
198 | static int | |
199 | find_status_by_pid (pid) | |
200 | pid_t pid; | |
201 | { | |
202 | int i; | |
203 | ||
204 | i = find_index_by_pid (pid); | |
205 | if (i == NO_PID) | |
206 | return (PROC_BAD); | |
bb70624e JA |
207 | if (pid_list[i].flags & PROC_RUNNING) |
208 | return (PROC_STILL_ALIVE); | |
726f6388 JA |
209 | return (pid_list[i].status); |
210 | } | |
211 | ||
bb70624e JA |
212 | static int |
213 | process_exit_status (status) | |
214 | WAIT status; | |
215 | { | |
216 | if (WIFSIGNALED (status)) | |
217 | return (128 + WTERMSIG (status)); | |
218 | else | |
219 | return (WEXITSTATUS (status)); | |
220 | } | |
221 | ||
b80f6443 JA |
222 | /* Return the status of PID as looked up in the PID_LIST array. A |
223 | return value of PROC_BAD indicates that PID wasn't found. */ | |
224 | static int | |
225 | find_termsig_by_pid (pid) | |
226 | pid_t pid; | |
227 | { | |
228 | int i; | |
229 | ||
230 | i = find_index_by_pid (pid); | |
231 | if (i == NO_PID) | |
232 | return (0); | |
233 | if (pid_list[i].flags & PROC_RUNNING) | |
234 | return (0); | |
235 | return (get_termsig (pid_list[i].status)); | |
236 | } | |
237 | ||
238 | /* Set LAST_COMMAND_EXIT_SIGNAL depending on STATUS. If STATUS is -1, look | |
239 | up PID in the pid array and set LAST_COMMAND_EXIT_SIGNAL appropriately | |
240 | depending on its flags and exit status. */ | |
241 | static int | |
242 | get_termsig (status) | |
243 | WAIT status; | |
244 | { | |
245 | if (WIFSTOPPED (status) == 0 && WIFSIGNALED (status)) | |
246 | return (WTERMSIG (status)); | |
247 | else | |
248 | return (0); | |
249 | } | |
250 | ||
726f6388 JA |
251 | /* Give PID the status value STATUS in the PID_LIST array. */ |
252 | static void | |
253 | set_pid_status (pid, status) | |
254 | pid_t pid; | |
255 | WAIT status; | |
256 | { | |
257 | int slot; | |
258 | ||
259 | slot = find_index_by_pid (pid); | |
260 | if (slot == NO_PID) | |
261 | return; | |
262 | ||
bb70624e JA |
263 | pid_list[slot].status = process_exit_status (status); |
264 | pid_list[slot].flags &= ~PROC_RUNNING; | |
b80f6443 JA |
265 | if (WIFSIGNALED (status)) |
266 | pid_list[slot].flags |= PROC_SIGNALED; | |
bb70624e JA |
267 | /* If it's not a background process, mark it as notified so it gets |
268 | cleaned up. */ | |
269 | if ((pid_list[slot].flags & PROC_ASYNC) == 0) | |
270 | pid_list[slot].flags |= PROC_NOTIFIED; | |
271 | } | |
272 | ||
273 | /* Give PID the flags FLAGS in the PID_LIST array. */ | |
274 | static void | |
275 | set_pid_flags (pid, flags) | |
276 | pid_t pid; | |
277 | int flags; | |
278 | { | |
279 | int slot; | |
280 | ||
281 | slot = find_index_by_pid (pid); | |
282 | if (slot == NO_PID) | |
283 | return; | |
284 | ||
285 | pid_list[slot].flags |= flags; | |
286 | } | |
287 | ||
288 | /* Unset FLAGS for PID in the pid list */ | |
289 | static void | |
290 | unset_pid_flags (pid, flags) | |
291 | pid_t pid; | |
292 | int flags; | |
293 | { | |
294 | int slot; | |
295 | ||
296 | slot = find_index_by_pid (pid); | |
297 | if (slot == NO_PID) | |
298 | return; | |
299 | ||
300 | pid_list[slot].flags &= ~flags; | |
726f6388 JA |
301 | } |
302 | ||
b80f6443 JA |
303 | /* Return the flags corresponding to PID in the PID_LIST array. */ |
304 | static int | |
305 | get_pid_flags (pid) | |
306 | pid_t pid; | |
307 | { | |
308 | int slot; | |
309 | ||
310 | slot = find_index_by_pid (pid); | |
311 | if (slot == NO_PID) | |
312 | return 0; | |
313 | ||
314 | return (pid_list[slot].flags); | |
315 | } | |
316 | ||
726f6388 | 317 | static void |
bb70624e | 318 | add_pid (pid, async) |
726f6388 | 319 | pid_t pid; |
bb70624e | 320 | int async; |
726f6388 JA |
321 | { |
322 | int slot; | |
323 | ||
324 | slot = find_proc_slot (); | |
bb70624e | 325 | |
726f6388 | 326 | pid_list[slot].pid = pid; |
bb70624e JA |
327 | pid_list[slot].status = -1; |
328 | pid_list[slot].flags = PROC_RUNNING; | |
329 | if (async) | |
330 | pid_list[slot].flags |= PROC_ASYNC; | |
331 | } | |
332 | ||
333 | static void | |
334 | mark_dead_jobs_as_notified (force) | |
335 | int force; | |
336 | { | |
337 | register int i, ndead; | |
338 | ||
339 | /* first, count the number of non-running async jobs if FORCE == 0 */ | |
340 | for (i = ndead = 0; force == 0 && i < pid_list_size; i++) | |
341 | { | |
342 | if (pid_list[i].pid == NO_PID) | |
343 | continue; | |
344 | if (((pid_list[i].flags & PROC_RUNNING) == 0) && | |
345 | (pid_list[i].flags & PROC_ASYNC)) | |
28ef6c31 | 346 | ndead++; |
bb70624e JA |
347 | } |
348 | ||
7117c2d2 JA |
349 | if (child_max < 0) |
350 | child_max = getmaxchild (); | |
351 | if (child_max < 0) | |
352 | child_max = DEFAULT_CHILD_MAX; | |
353 | ||
354 | if (force == 0 && ndead <= child_max) | |
bb70624e JA |
355 | return; |
356 | ||
357 | /* If FORCE == 0, we just mark as many non-running async jobs as notified | |
358 | to bring us under the CHILD_MAX limit. */ | |
359 | for (i = 0; i < pid_list_size; i++) | |
360 | { | |
361 | if (pid_list[i].pid == NO_PID) | |
362 | continue; | |
363 | if (((pid_list[i].flags & PROC_RUNNING) == 0) && | |
364 | pid_list[i].pid != last_asynchronous_pid) | |
365 | { | |
366 | pid_list[i].flags |= PROC_NOTIFIED; | |
7117c2d2 | 367 | if (force == 0 && (pid_list[i].flags & PROC_ASYNC) && --ndead <= child_max) |
bb70624e JA |
368 | break; |
369 | } | |
370 | } | |
726f6388 JA |
371 | } |
372 | ||
bb70624e | 373 | /* Remove all dead, notified jobs from the pid_list. */ |
726f6388 JA |
374 | int |
375 | cleanup_dead_jobs () | |
376 | { | |
377 | register int i; | |
378 | ||
ccc6cda3 | 379 | #if defined (HAVE_WAITPID) |
726f6388 JA |
380 | reap_zombie_children (); |
381 | #endif | |
382 | ||
383 | for (i = 0; i < pid_list_size; i++) | |
bb70624e JA |
384 | { |
385 | if ((pid_list[i].flags & PROC_RUNNING) == 0 && | |
386 | (pid_list[i].flags & PROC_NOTIFIED)) | |
387 | pid_list[i].pid = NO_PID; | |
388 | } | |
389 | ||
390 | return 0; | |
391 | } | |
392 | ||
393 | void | |
394 | reap_dead_jobs () | |
395 | { | |
396 | mark_dead_jobs_as_notified (0); | |
397 | cleanup_dead_jobs (); | |
726f6388 JA |
398 | } |
399 | ||
400 | /* Initialize the job control mechanism, and set up the tty stuff. */ | |
d166f048 JA |
401 | initialize_job_control (force) |
402 | int force; | |
726f6388 | 403 | { |
d166f048 JA |
404 | shell_tty = fileno (stderr); |
405 | ||
406 | if (interactive) | |
407 | get_tty_state (); | |
726f6388 JA |
408 | } |
409 | ||
726f6388 JA |
410 | /* Setup this shell to handle C-C, etc. */ |
411 | void | |
412 | initialize_job_signals () | |
413 | { | |
414 | set_signal_handler (SIGINT, sigint_sighandler); | |
726f6388 JA |
415 | |
416 | /* If this is a login shell we don't wish to be disturbed by | |
417 | stop signals. */ | |
418 | if (login_shell) | |
ccc6cda3 | 419 | ignore_tty_job_signals (); |
726f6388 JA |
420 | } |
421 | ||
ccc6cda3 | 422 | #if defined (HAVE_WAITPID) |
726f6388 JA |
423 | /* Collect the status of all zombie children so that their system |
424 | resources can be deallocated. */ | |
425 | static void | |
426 | reap_zombie_children () | |
427 | { | |
b80f6443 | 428 | # if defined (WNOHANG) |
726f6388 JA |
429 | pid_t pid; |
430 | WAIT status; | |
431 | ||
0628567a | 432 | CHECK_TERMSIG; |
726f6388 JA |
433 | while ((pid = waitpid (-1, (int *)&status, WNOHANG)) > 0) |
434 | set_pid_status (pid, status); | |
b80f6443 | 435 | # endif /* WNOHANG */ |
0628567a | 436 | CHECK_TERMSIG; |
726f6388 | 437 | } |
b80f6443 JA |
438 | #endif /* WAITPID */ |
439 | ||
440 | #if !defined (HAVE_SIGINTERRUPT) && defined (HAVE_POSIX_SIGNALS) | |
441 | static int | |
442 | siginterrupt (sig, flag) | |
443 | int sig, flag; | |
444 | { | |
445 | struct sigaction act; | |
446 | ||
447 | sigaction (sig, (struct sigaction *)NULL, &act); | |
448 | ||
449 | if (flag) | |
450 | act.sa_flags &= ~SA_RESTART; | |
451 | else | |
452 | act.sa_flags |= SA_RESTART; | |
453 | ||
454 | return (sigaction (sig, &act, (struct sigaction *)NULL)); | |
455 | } | |
456 | #endif /* !HAVE_SIGINTERRUPT && HAVE_POSIX_SIGNALS */ | |
726f6388 JA |
457 | |
458 | /* Fork, handling errors. Returns the pid of the newly made child, or 0. | |
459 | COMMAND is just for remembering the name of the command; we don't do | |
460 | anything else with it. ASYNC_P says what to do with the tty. If | |
461 | non-zero, then don't give it away. */ | |
462 | pid_t | |
463 | make_child (command, async_p) | |
464 | char *command; | |
465 | int async_p; | |
466 | { | |
467 | pid_t pid; | |
ccc6cda3 | 468 | #if defined (HAVE_WAITPID) |
726f6388 | 469 | int retry = 1; |
ccc6cda3 | 470 | #endif /* HAVE_WAITPID */ |
726f6388 JA |
471 | |
472 | /* Discard saved memory. */ | |
ccc6cda3 | 473 | if (command) |
726f6388 JA |
474 | free (command); |
475 | ||
476 | start_pipeline (); | |
477 | ||
478 | #if defined (BUFFERED_INPUT) | |
479 | /* If default_buffered_input is active, we are reading a script. If | |
480 | the command is asynchronous, we have already duplicated /dev/null | |
481 | as fd 0, but have not changed the buffered stream corresponding to | |
482 | the old fd 0. We don't want to sync the stream in this case. */ | |
cce855bc | 483 | if (default_buffered_input != -1 && (!async_p || default_buffered_input > 0)) |
726f6388 JA |
484 | sync_buffered_stream (default_buffered_input); |
485 | #endif /* BUFFERED_INPUT */ | |
486 | ||
487 | /* Create the child, handle severe errors. */ | |
ccc6cda3 | 488 | #if defined (HAVE_WAITPID) |
726f6388 | 489 | retry_fork: |
ccc6cda3 | 490 | #endif /* HAVE_WAITPID */ |
726f6388 JA |
491 | |
492 | if ((pid = fork ()) < 0) | |
493 | { | |
ccc6cda3 | 494 | #if defined (HAVE_WAITPID) |
726f6388 JA |
495 | /* Posix systems with a non-blocking waitpid () system call available |
496 | get another chance after zombies are reaped. */ | |
497 | if (errno == EAGAIN && retry) | |
498 | { | |
499 | reap_zombie_children (); | |
500 | retry = 0; | |
501 | goto retry_fork; | |
502 | } | |
ccc6cda3 | 503 | #endif /* HAVE_WAITPID */ |
726f6388 | 504 | |
ccc6cda3 | 505 | sys_error ("fork"); |
726f6388 JA |
506 | |
507 | throw_to_top_level (); | |
508 | } | |
ccc6cda3 | 509 | |
726f6388 JA |
510 | if (pid == 0) |
511 | { | |
512 | #if defined (BUFFERED_INPUT) | |
cce855bc | 513 | unset_bash_input (0); |
726f6388 JA |
514 | #endif /* BUFFERED_INPUT */ |
515 | ||
ccc6cda3 | 516 | #if defined (HAVE_POSIX_SIGNALS) |
726f6388 JA |
517 | /* Restore top-level signal mask. */ |
518 | sigprocmask (SIG_SETMASK, &top_level_mask, (sigset_t *)NULL); | |
519 | #endif | |
520 | ||
521 | /* Ignore INT and QUIT in asynchronous children. */ | |
522 | if (async_p) | |
ccc6cda3 | 523 | last_asynchronous_pid = getpid (); |
726f6388 | 524 | |
ccc6cda3 | 525 | default_tty_job_signals (); |
726f6388 JA |
526 | } |
527 | else | |
528 | { | |
529 | /* In the parent. */ | |
530 | ||
531 | last_made_pid = pid; | |
532 | ||
533 | if (async_p) | |
534 | last_asynchronous_pid = pid; | |
535 | ||
bb70624e | 536 | add_pid (pid, async_p); |
726f6388 JA |
537 | } |
538 | return (pid); | |
539 | } | |
540 | ||
ccc6cda3 JA |
541 | void |
542 | ignore_tty_job_signals () | |
543 | { | |
544 | #if defined (SIGTSTP) | |
545 | set_signal_handler (SIGTSTP, SIG_IGN); | |
546 | set_signal_handler (SIGTTIN, SIG_IGN); | |
547 | set_signal_handler (SIGTTOU, SIG_IGN); | |
548 | #endif | |
549 | } | |
550 | ||
551 | void | |
552 | default_tty_job_signals () | |
553 | { | |
554 | #if defined (SIGTSTP) | |
555 | set_signal_handler (SIGTSTP, SIG_DFL); | |
556 | set_signal_handler (SIGTTIN, SIG_DFL); | |
557 | set_signal_handler (SIGTTOU, SIG_DFL); | |
558 | #endif | |
559 | } | |
560 | ||
bb70624e JA |
561 | /* Wait for a single pid (PID) and return its exit status. Called by |
562 | the wait builtin. */ | |
f73dda09 | 563 | int |
726f6388 JA |
564 | wait_for_single_pid (pid) |
565 | pid_t pid; | |
566 | { | |
567 | pid_t got_pid; | |
568 | WAIT status; | |
b80f6443 | 569 | int pstatus, flags; |
726f6388 JA |
570 | |
571 | pstatus = find_status_by_pid (pid); | |
572 | ||
573 | if (pstatus == PROC_BAD) | |
ccc6cda3 | 574 | { |
b80f6443 | 575 | internal_error (_("wait: pid %ld is not a child of this shell"), (long)pid); |
ccc6cda3 JA |
576 | return (127); |
577 | } | |
726f6388 JA |
578 | |
579 | if (pstatus != PROC_STILL_ALIVE) | |
b80f6443 JA |
580 | { |
581 | if (pstatus > 128) | |
582 | last_command_exit_signal = find_termsig_by_pid (pid); | |
583 | return (pstatus); | |
584 | } | |
726f6388 JA |
585 | |
586 | siginterrupt (SIGINT, 1); | |
587 | while ((got_pid = WAITPID (pid, &status, 0)) != pid) | |
588 | { | |
0628567a | 589 | CHECK_TERMSIG; |
726f6388 JA |
590 | if (got_pid < 0) |
591 | { | |
592 | if (errno != EINTR && errno != ECHILD) | |
593 | { | |
594 | siginterrupt (SIGINT, 0); | |
ccc6cda3 | 595 | sys_error ("wait"); |
726f6388 JA |
596 | } |
597 | break; | |
598 | } | |
599 | else if (got_pid > 0) | |
28ef6c31 | 600 | set_pid_status (got_pid, status); |
726f6388 JA |
601 | } |
602 | ||
7117c2d2 JA |
603 | if (got_pid > 0) |
604 | { | |
605 | set_pid_status (got_pid, status); | |
606 | set_pid_flags (got_pid, PROC_NOTIFIED); | |
607 | } | |
bb70624e | 608 | |
726f6388 JA |
609 | siginterrupt (SIGINT, 0); |
610 | QUIT; | |
611 | ||
7117c2d2 | 612 | return (got_pid > 0 ? process_exit_status (status) : -1); |
726f6388 JA |
613 | } |
614 | ||
bb70624e JA |
615 | /* Wait for all of the shell's children to exit. Called by the `wait' |
616 | builtin. */ | |
726f6388 JA |
617 | void |
618 | wait_for_background_pids () | |
619 | { | |
620 | pid_t got_pid; | |
621 | WAIT status; | |
622 | ||
623 | /* If we aren't using job control, we let the kernel take care of the | |
ccc6cda3 | 624 | bookkeeping for us. wait () will return -1 and set errno to ECHILD |
726f6388 JA |
625 | when there are no more unwaited-for child processes on both |
626 | 4.2 BSD-based and System V-based systems. */ | |
627 | ||
628 | siginterrupt (SIGINT, 1); | |
629 | ||
630 | /* Wait for ECHILD */ | |
631 | while ((got_pid = WAITPID (-1, &status, 0)) != -1) | |
632 | set_pid_status (got_pid, status); | |
633 | ||
634 | if (errno != EINTR && errno != ECHILD) | |
635 | { | |
636 | siginterrupt (SIGINT, 0); | |
ccc6cda3 | 637 | sys_error("wait"); |
726f6388 JA |
638 | } |
639 | ||
640 | siginterrupt (SIGINT, 0); | |
641 | QUIT; | |
bb70624e JA |
642 | |
643 | mark_dead_jobs_as_notified (1); | |
644 | cleanup_dead_jobs (); | |
645 | } | |
646 | ||
647 | /* Make OLD_SIGINT_HANDLER the SIGINT signal handler. */ | |
648 | #define INVALID_SIGNAL_HANDLER (SigHandler *)wait_for_background_pids | |
649 | static SigHandler *old_sigint_handler = INVALID_SIGNAL_HANDLER; | |
650 | ||
651 | static void | |
652 | restore_sigint_handler () | |
653 | { | |
654 | if (old_sigint_handler != INVALID_SIGNAL_HANDLER) | |
655 | { | |
656 | set_signal_handler (SIGINT, old_sigint_handler); | |
657 | old_sigint_handler = INVALID_SIGNAL_HANDLER; | |
658 | } | |
726f6388 JA |
659 | } |
660 | ||
661 | /* Handle SIGINT while we are waiting for children in a script to exit. | |
662 | All interrupts are effectively ignored by the shell, but allowed to | |
663 | kill a running job. */ | |
664 | static sighandler | |
665 | wait_sigint_handler (sig) | |
666 | int sig; | |
667 | { | |
bb70624e JA |
668 | SigHandler *sigint_handler; |
669 | ||
670 | /* If we got a SIGINT while in `wait', and SIGINT is trapped, do | |
671 | what POSIX.2 says (see builtins/wait.def for more info). */ | |
672 | if (this_shell_builtin && this_shell_builtin == wait_builtin && | |
673 | signal_is_trapped (SIGINT) && | |
674 | ((sigint_handler = trap_to_sighandler (SIGINT)) == trap_handler)) | |
675 | { | |
676 | last_command_exit_value = EXECUTION_FAILURE; | |
677 | restore_sigint_handler (); | |
678 | interrupt_immediately = 0; | |
679 | trap_handler (SIGINT); /* set pending_traps[SIGINT] */ | |
7117c2d2 | 680 | wait_signal_received = SIGINT; |
bb70624e JA |
681 | longjmp (wait_intr_buf, 1); |
682 | } | |
683 | ||
28ef6c31 JA |
684 | if (interrupt_immediately) |
685 | { | |
686 | last_command_exit_value = EXECUTION_FAILURE; | |
687 | restore_sigint_handler (); | |
688 | ADDINTERRUPT; | |
689 | QUIT; | |
690 | } | |
726f6388 | 691 | |
bb70624e JA |
692 | wait_sigint_received = 1; |
693 | ||
ccc6cda3 | 694 | SIGRETURN (0); |
726f6388 JA |
695 | } |
696 | ||
b80f6443 JA |
697 | static char * |
698 | j_strsignal (s) | |
699 | int s; | |
700 | { | |
701 | static char retcode_name_buffer[64] = { '\0' }; | |
702 | char *x; | |
703 | ||
704 | x = strsignal (s); | |
705 | if (x == 0) | |
706 | { | |
707 | x = retcode_name_buffer; | |
708 | sprintf (x, "Signal %d", s); | |
709 | } | |
710 | return x; | |
711 | } | |
712 | ||
726f6388 JA |
713 | /* Wait for pid (one of our children) to terminate. This is called only |
714 | by the execution code in execute_cmd.c. */ | |
715 | int | |
716 | wait_for (pid) | |
717 | pid_t pid; | |
718 | { | |
719 | int return_val, pstatus; | |
720 | pid_t got_pid; | |
721 | WAIT status; | |
726f6388 JA |
722 | |
723 | pstatus = find_status_by_pid (pid); | |
724 | ||
725 | if (pstatus == PROC_BAD) | |
726 | return (0); | |
727 | ||
728 | if (pstatus != PROC_STILL_ALIVE) | |
b80f6443 JA |
729 | { |
730 | if (pstatus > 128) | |
731 | last_command_exit_signal = find_termsig_by_pid (pid); | |
732 | return (pstatus); | |
733 | } | |
726f6388 JA |
734 | |
735 | /* If we are running a script, ignore SIGINT while we're waiting for | |
736 | a child to exit. The loop below does some of this, but not all. */ | |
bb70624e JA |
737 | wait_sigint_received = 0; |
738 | if (interactive_shell == 0) | |
726f6388 JA |
739 | old_sigint_handler = set_signal_handler (SIGINT, wait_sigint_handler); |
740 | ||
741 | while ((got_pid = WAITPID (-1, &status, 0)) != pid) /* XXX was pid now -1 */ | |
742 | { | |
0628567a | 743 | CHECK_TERMSIG; |
726f6388 JA |
744 | if (got_pid < 0 && errno == ECHILD) |
745 | { | |
746 | #if !defined (_POSIX_VERSION) | |
747 | status.w_termsig = status.w_retcode = 0; | |
748 | #else | |
749 | status = 0; | |
750 | #endif /* _POSIX_VERSION */ | |
751 | break; | |
752 | } | |
753 | else if (got_pid < 0 && errno != EINTR) | |
f73dda09 | 754 | programming_error ("wait_for(%ld): %s", (long)pid, strerror(errno)); |
726f6388 JA |
755 | else if (got_pid > 0) |
756 | set_pid_status (got_pid, status); | |
757 | } | |
758 | ||
7117c2d2 JA |
759 | if (got_pid > 0) |
760 | set_pid_status (got_pid, status); | |
726f6388 | 761 | |
ccc6cda3 | 762 | #if defined (HAVE_WAITPID) |
726f6388 JA |
763 | if (got_pid >= 0) |
764 | reap_zombie_children (); | |
ccc6cda3 | 765 | #endif /* HAVE_WAITPID */ |
726f6388 | 766 | |
ccc6cda3 | 767 | if (interactive_shell == 0) |
726f6388 | 768 | { |
bb70624e JA |
769 | SigHandler *temp_handler; |
770 | ||
771 | temp_handler = old_sigint_handler; | |
772 | restore_sigint_handler (); | |
773 | ||
726f6388 JA |
774 | /* If the job exited because of SIGINT, make sure the shell acts as if |
775 | it had received one also. */ | |
776 | if (WIFSIGNALED (status) && (WTERMSIG (status) == SIGINT)) | |
777 | { | |
bb70624e | 778 | |
726f6388 | 779 | if (maybe_call_trap_handler (SIGINT) == 0) |
bb70624e JA |
780 | { |
781 | if (temp_handler == SIG_DFL) | |
0628567a | 782 | termsig_handler (SIGINT); |
bb70624e JA |
783 | else if (temp_handler != INVALID_SIGNAL_HANDLER && temp_handler != SIG_IGN) |
784 | (*temp_handler) (SIGINT); | |
785 | } | |
726f6388 JA |
786 | } |
787 | } | |
ccc6cda3 | 788 | |
726f6388 JA |
789 | /* Default return value. */ |
790 | /* ``a full 8 bits of status is returned'' */ | |
bb70624e | 791 | return_val = process_exit_status (status); |
b80f6443 | 792 | last_command_exit_signal = get_termsig (status); |
ccc6cda3 | 793 | |
d166f048 JA |
794 | #if !defined (DONT_REPORT_SIGPIPE) |
795 | if ((WIFSTOPPED (status) == 0) && WIFSIGNALED (status) && | |
796 | (WTERMSIG (status) != SIGINT)) | |
797 | #else | |
798 | if ((WIFSTOPPED (status) == 0) && WIFSIGNALED (status) && | |
799 | (WTERMSIG (status) != SIGINT) && (WTERMSIG (status) != SIGPIPE)) | |
800 | #endif | |
726f6388 | 801 | { |
b80f6443 | 802 | fprintf (stderr, "%s", j_strsignal (WTERMSIG (status))); |
726f6388 JA |
803 | if (WIFCORED (status)) |
804 | fprintf (stderr, " (core dumped)"); | |
805 | fprintf (stderr, "\n"); | |
806 | } | |
807 | ||
ccc6cda3 | 808 | if (interactive_shell && subshell_environment == 0) |
726f6388 JA |
809 | { |
810 | if (WIFSIGNALED (status) || WIFSTOPPED (status)) | |
811 | set_tty_state (); | |
812 | else | |
813 | get_tty_state (); | |
814 | } | |
815 | ||
816 | return (return_val); | |
817 | } | |
818 | ||
95732b49 JA |
819 | /* Send PID SIGNAL. Returns -1 on failure, 0 on success. If GROUP is non-zero, |
820 | or PID is less than -1, then kill the process group associated with PID. */ | |
726f6388 JA |
821 | int |
822 | kill_pid (pid, signal, group) | |
823 | pid_t pid; | |
824 | int signal, group; | |
825 | { | |
826 | int result; | |
827 | ||
95732b49 JA |
828 | if (pid < -1) |
829 | { | |
830 | pid = -pid; | |
831 | group = 1; | |
832 | } | |
bb70624e | 833 | result = group ? killpg (pid, signal) : kill (pid, signal); |
726f6388 JA |
834 | return (result); |
835 | } | |
836 | ||
bb70624e | 837 | static TTYSTRUCT shell_tty_info; |
ccc6cda3 | 838 | static int got_tty_state; |
726f6388 JA |
839 | |
840 | /* Fill the contents of shell_tty_info with the current tty info. */ | |
841 | get_tty_state () | |
842 | { | |
ccc6cda3 JA |
843 | int tty; |
844 | ||
d166f048 | 845 | tty = input_tty (); |
726f6388 JA |
846 | if (tty != -1) |
847 | { | |
bb70624e | 848 | ttgetattr (tty, &shell_tty_info); |
726f6388 | 849 | got_tty_state = 1; |
ccc6cda3 | 850 | if (check_window_size) |
95732b49 | 851 | get_new_window_size (0, (int *)0, (int *)0); |
726f6388 JA |
852 | } |
853 | } | |
854 | ||
855 | /* Make the current tty use the state in shell_tty_info. */ | |
b72432fd | 856 | int |
726f6388 JA |
857 | set_tty_state () |
858 | { | |
ccc6cda3 JA |
859 | int tty; |
860 | ||
d166f048 | 861 | tty = input_tty (); |
726f6388 JA |
862 | if (tty != -1) |
863 | { | |
ccc6cda3 | 864 | if (got_tty_state == 0) |
b72432fd | 865 | return 0; |
bb70624e | 866 | ttsetattr (tty, &shell_tty_info); |
726f6388 | 867 | } |
b72432fd | 868 | return 0; |
726f6388 JA |
869 | } |
870 | ||
871 | /* Give the terminal to PGRP. */ | |
28ef6c31 | 872 | give_terminal_to (pgrp, force) |
726f6388 | 873 | pid_t pgrp; |
28ef6c31 | 874 | int force; |
726f6388 JA |
875 | { |
876 | } | |
877 | ||
878 | /* Stop a pipeline. */ | |
f73dda09 | 879 | int |
726f6388 JA |
880 | stop_pipeline (async, ignore) |
881 | int async; | |
882 | COMMAND *ignore; | |
883 | { | |
884 | already_making_children = 0; | |
f73dda09 | 885 | return 0; |
726f6388 JA |
886 | } |
887 | ||
888 | void | |
889 | start_pipeline () | |
890 | { | |
891 | already_making_children = 1; | |
892 | } | |
893 | ||
f73dda09 JA |
894 | void |
895 | stop_making_children () | |
896 | { | |
897 | already_making_children = 0; | |
898 | } | |
899 | ||
d166f048 JA |
900 | int |
901 | get_job_by_pid (pid, block) | |
902 | pid_t pid; | |
903 | int block; | |
904 | { | |
905 | int i; | |
906 | ||
907 | i = find_index_by_pid (pid); | |
908 | return ((i == NO_PID) ? PROC_BAD : i); | |
909 | } | |
910 | ||
726f6388 JA |
911 | /* Print descriptive information about the job with leader pid PID. */ |
912 | void | |
913 | describe_pid (pid) | |
914 | pid_t pid; | |
915 | { | |
f73dda09 | 916 | fprintf (stderr, "%ld\n", (long) pid); |
726f6388 | 917 | } |
ccc6cda3 JA |
918 | |
919 | void | |
920 | unfreeze_jobs_list () | |
921 | { | |
922 | } | |
bb70624e JA |
923 | |
924 | int | |
925 | count_all_jobs () | |
926 | { | |
927 | return 0; | |
928 | } |