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Commit | Line | Data |
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3185942a | 1 | /* nojobs.c - functions that make children, remember them, and handle their termination. */ |
726f6388 | 2 | |
ccc6cda3 JA |
3 | /* This file works under BSD, System V, minix, and Posix systems. It does |
4 | not implement job control. */ | |
726f6388 | 5 | |
74091dd4 | 6 | /* Copyright (C) 1987-2022 Free Software Foundation, Inc. |
726f6388 JA |
7 | |
8 | This file is part of GNU Bash, the Bourne Again SHell. | |
9 | ||
3185942a JA |
10 | Bash is free software: you can redistribute it and/or modify |
11 | it under the terms of the GNU General Public License as published by | |
12 | the Free Software Foundation, either version 3 of the License, or | |
13 | (at your option) any later version. | |
726f6388 | 14 | |
3185942a JA |
15 | Bash is distributed in the hope that it will be useful, |
16 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | GNU General Public License for more details. | |
726f6388 | 19 | |
3185942a JA |
20 | You should have received a copy of the GNU General Public License |
21 | along with Bash. If not, see <http://www.gnu.org/licenses/>. | |
22 | */ | |
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" | |
17345e5a | 48 | #include "execute_cmd.h" |
a0c0a00f | 49 | #include "trap.h" |
bb70624e JA |
50 | |
51 | #include "builtins/builtext.h" /* for wait_builtin */ | |
d233b485 | 52 | #include "builtins/common.h" |
bb70624e | 53 | |
8868edaf | 54 | #define DEFAULT_CHILD_MAX 4096 |
bb70624e | 55 | |
ccc6cda3 | 56 | #if defined (_POSIX_VERSION) || !defined (HAVE_KILLPG) |
726f6388 JA |
57 | # define killpg(pg, sig) kill(-(pg),(sig)) |
58 | #endif /* USG || _POSIX_VERSION */ | |
59 | ||
b80f6443 | 60 | #if !defined (HAVE_SIGINTERRUPT) && !defined (HAVE_POSIX_SIGNALS) |
726f6388 | 61 | # define siginterrupt(sig, code) |
b80f6443 | 62 | #endif /* !HAVE_SIGINTERRUPT && !HAVE_POSIX_SIGNALS */ |
726f6388 | 63 | |
ccc6cda3 | 64 | #if defined (HAVE_WAITPID) |
726f6388 JA |
65 | # define WAITPID(pid, statusp, options) waitpid (pid, statusp, options) |
66 | #else | |
67 | # define WAITPID(pid, statusp, options) wait (statusp) | |
ccc6cda3 | 68 | #endif /* !HAVE_WAITPID */ |
726f6388 | 69 | |
d166f048 JA |
70 | /* Return the fd from which we are actually getting input. */ |
71 | #define input_tty() (shell_tty != -1) ? shell_tty : fileno (stderr) | |
72 | ||
726f6388 JA |
73 | #if !defined (errno) |
74 | extern int errno; | |
75 | #endif /* !errno */ | |
76 | ||
8868edaf | 77 | extern void set_original_signal PARAMS((int, SigHandler *)); |
a0c0a00f | 78 | |
ac50fbac CR |
79 | volatile pid_t last_made_pid = NO_PID; |
80 | volatile pid_t last_asynchronous_pid = NO_PID; | |
726f6388 | 81 | |
8868edaf CR |
82 | static int queue_sigchld; /* dummy declaration */ |
83 | int waiting_for_child; | |
a0c0a00f | 84 | |
726f6388 JA |
85 | /* Call this when you start making children. */ |
86 | int already_making_children = 0; | |
87 | ||
d166f048 JA |
88 | /* The controlling tty for this shell. */ |
89 | int shell_tty = -1; | |
90 | ||
ccc6cda3 JA |
91 | /* If this is non-zero, $LINES and $COLUMNS are reset after every process |
92 | exits from get_tty_state(). */ | |
ac50fbac CR |
93 | int check_window_size = CHECKWINSIZE_DEFAULT; |
94 | ||
95 | /* We don't have job control. */ | |
96 | int job_control = 0; | |
ccc6cda3 | 97 | |
a0c0a00f CR |
98 | int running_in_background = 0; /* can't tell without job control */ |
99 | ||
bb70624e JA |
100 | /* STATUS and FLAGS are only valid if pid != NO_PID |
101 | STATUS is only valid if (flags & PROC_RUNNING) == 0 */ | |
726f6388 JA |
102 | struct proc_status { |
103 | pid_t pid; | |
104 | int status; /* Exit status of PID or 128 + fatal signal number */ | |
bb70624e | 105 | int flags; |
726f6388 JA |
106 | }; |
107 | ||
bb70624e JA |
108 | /* Values for proc_status.flags */ |
109 | #define PROC_RUNNING 0x01 | |
110 | #define PROC_NOTIFIED 0x02 | |
111 | #define PROC_ASYNC 0x04 | |
b80f6443 | 112 | #define PROC_SIGNALED 0x10 |
bb70624e | 113 | |
bb70624e JA |
114 | /* Return values from find_status_by_pid */ |
115 | #define PROC_BAD -1 | |
726f6388 JA |
116 | #define PROC_STILL_ALIVE -2 |
117 | ||
f73dda09 JA |
118 | static struct proc_status *pid_list = (struct proc_status *)NULL; |
119 | static int pid_list_size; | |
120 | static int wait_sigint_received; | |
121 | ||
7117c2d2 JA |
122 | static long child_max = -1L; |
123 | ||
8868edaf CR |
124 | static void alloc_pid_list PARAMS((void)); |
125 | static int find_proc_slot PARAMS((pid_t)); | |
126 | static int find_index_by_pid PARAMS((pid_t)); | |
127 | static int find_status_by_pid PARAMS((pid_t)); | |
128 | static int process_exit_status PARAMS((WAIT)); | |
129 | static int find_termsig_by_pid PARAMS((pid_t)); | |
130 | static int get_termsig PARAMS((WAIT)); | |
131 | static void set_pid_status PARAMS((pid_t, WAIT)); | |
132 | static void set_pid_flags PARAMS((pid_t, int)); | |
133 | static void unset_pid_flags PARAMS((pid_t, int)); | |
134 | static int get_pid_flags PARAMS((pid_t)); | |
135 | static void add_pid PARAMS((pid_t, int)); | |
136 | static void mark_dead_jobs_as_notified PARAMS((int)); | |
137 | ||
138 | static sighandler wait_sigint_handler PARAMS((int)); | |
139 | static char *j_strsignal PARAMS((int)); | |
f73dda09 JA |
140 | |
141 | #if defined (HAVE_WAITPID) | |
8868edaf | 142 | static void reap_zombie_children PARAMS((void)); |
f73dda09 JA |
143 | #endif |
144 | ||
b80f6443 | 145 | #if !defined (HAVE_SIGINTERRUPT) && defined (HAVE_POSIX_SIGNALS) |
8868edaf | 146 | static int siginterrupt PARAMS((int, int)); |
b80f6443 JA |
147 | #endif |
148 | ||
8868edaf | 149 | static void restore_sigint_handler PARAMS((void)); |
f73dda09 | 150 | |
726f6388 JA |
151 | /* Allocate new, or grow existing PID_LIST. */ |
152 | static void | |
153 | alloc_pid_list () | |
154 | { | |
155 | register int i; | |
156 | int old = pid_list_size; | |
157 | ||
158 | pid_list_size += 10; | |
f73dda09 | 159 | pid_list = (struct proc_status *)xrealloc (pid_list, pid_list_size * sizeof (struct proc_status)); |
726f6388 JA |
160 | |
161 | /* None of the newly allocated slots have process id's yet. */ | |
162 | for (i = old; i < pid_list_size; i++) | |
d233b485 CR |
163 | { |
164 | pid_list[i].pid = NO_PID; | |
165 | pid_list[i].status = pid_list[i].flags = 0; | |
166 | } | |
726f6388 JA |
167 | } |
168 | ||
169 | /* Return the offset within the PID_LIST array of an empty slot. This can | |
170 | create new slots if all of the existing slots are taken. */ | |
171 | static int | |
a0c0a00f CR |
172 | find_proc_slot (pid) |
173 | pid_t pid; | |
726f6388 JA |
174 | { |
175 | register int i; | |
176 | ||
177 | for (i = 0; i < pid_list_size; i++) | |
a0c0a00f | 178 | if (pid_list[i].pid == NO_PID || pid_list[i].pid == pid) |
726f6388 JA |
179 | return (i); |
180 | ||
181 | if (i == pid_list_size) | |
182 | alloc_pid_list (); | |
183 | ||
184 | return (i); | |
185 | } | |
186 | ||
187 | /* Return the offset within the PID_LIST array of a slot containing PID, | |
188 | or the value NO_PID if the pid wasn't found. */ | |
189 | static int | |
190 | find_index_by_pid (pid) | |
191 | pid_t pid; | |
192 | { | |
193 | register int i; | |
194 | ||
195 | for (i = 0; i < pid_list_size; i++) | |
196 | if (pid_list[i].pid == pid) | |
197 | return (i); | |
198 | ||
199 | return (NO_PID); | |
200 | } | |
201 | ||
202 | /* Return the status of PID as looked up in the PID_LIST array. A | |
203 | return value of PROC_BAD indicates that PID wasn't found. */ | |
204 | static int | |
205 | find_status_by_pid (pid) | |
206 | pid_t pid; | |
207 | { | |
208 | int i; | |
209 | ||
210 | i = find_index_by_pid (pid); | |
211 | if (i == NO_PID) | |
212 | return (PROC_BAD); | |
bb70624e JA |
213 | if (pid_list[i].flags & PROC_RUNNING) |
214 | return (PROC_STILL_ALIVE); | |
726f6388 JA |
215 | return (pid_list[i].status); |
216 | } | |
217 | ||
bb70624e JA |
218 | static int |
219 | process_exit_status (status) | |
220 | WAIT status; | |
221 | { | |
222 | if (WIFSIGNALED (status)) | |
223 | return (128 + WTERMSIG (status)); | |
224 | else | |
225 | return (WEXITSTATUS (status)); | |
226 | } | |
227 | ||
b80f6443 JA |
228 | /* Return the status of PID as looked up in the PID_LIST array. A |
229 | return value of PROC_BAD indicates that PID wasn't found. */ | |
230 | static int | |
231 | find_termsig_by_pid (pid) | |
232 | pid_t pid; | |
233 | { | |
234 | int i; | |
235 | ||
236 | i = find_index_by_pid (pid); | |
237 | if (i == NO_PID) | |
238 | return (0); | |
239 | if (pid_list[i].flags & PROC_RUNNING) | |
240 | return (0); | |
3185942a | 241 | return (get_termsig ((WAIT)pid_list[i].status)); |
b80f6443 JA |
242 | } |
243 | ||
244 | /* Set LAST_COMMAND_EXIT_SIGNAL depending on STATUS. If STATUS is -1, look | |
245 | up PID in the pid array and set LAST_COMMAND_EXIT_SIGNAL appropriately | |
246 | depending on its flags and exit status. */ | |
247 | static int | |
248 | get_termsig (status) | |
249 | WAIT status; | |
250 | { | |
251 | if (WIFSTOPPED (status) == 0 && WIFSIGNALED (status)) | |
252 | return (WTERMSIG (status)); | |
253 | else | |
254 | return (0); | |
255 | } | |
256 | ||
726f6388 JA |
257 | /* Give PID the status value STATUS in the PID_LIST array. */ |
258 | static void | |
259 | set_pid_status (pid, status) | |
260 | pid_t pid; | |
261 | WAIT status; | |
262 | { | |
263 | int slot; | |
264 | ||
17345e5a JA |
265 | #if defined (COPROCESS_SUPPORT) |
266 | coproc_pidchk (pid, status); | |
267 | #endif | |
268 | ||
d233b485 CR |
269 | #if defined (PROCESS_SUBSTITUTION) |
270 | if ((slot = find_procsub_child (pid)) >= 0) | |
271 | set_procsub_status (slot, pid, WSTATUS (status)); | |
272 | /* XXX - also saving in list below */ | |
273 | #endif | |
274 | ||
726f6388 JA |
275 | slot = find_index_by_pid (pid); |
276 | if (slot == NO_PID) | |
277 | return; | |
278 | ||
bb70624e JA |
279 | pid_list[slot].status = process_exit_status (status); |
280 | pid_list[slot].flags &= ~PROC_RUNNING; | |
b80f6443 JA |
281 | if (WIFSIGNALED (status)) |
282 | pid_list[slot].flags |= PROC_SIGNALED; | |
bb70624e JA |
283 | /* If it's not a background process, mark it as notified so it gets |
284 | cleaned up. */ | |
285 | if ((pid_list[slot].flags & PROC_ASYNC) == 0) | |
286 | pid_list[slot].flags |= PROC_NOTIFIED; | |
287 | } | |
288 | ||
289 | /* Give PID the flags FLAGS in the PID_LIST array. */ | |
290 | static void | |
291 | set_pid_flags (pid, flags) | |
292 | pid_t pid; | |
293 | int flags; | |
294 | { | |
295 | int slot; | |
296 | ||
297 | slot = find_index_by_pid (pid); | |
298 | if (slot == NO_PID) | |
299 | return; | |
300 | ||
301 | pid_list[slot].flags |= flags; | |
302 | } | |
303 | ||
304 | /* Unset FLAGS for PID in the pid list */ | |
305 | static void | |
306 | unset_pid_flags (pid, flags) | |
307 | pid_t pid; | |
308 | int flags; | |
309 | { | |
310 | int slot; | |
311 | ||
312 | slot = find_index_by_pid (pid); | |
313 | if (slot == NO_PID) | |
314 | return; | |
315 | ||
316 | pid_list[slot].flags &= ~flags; | |
726f6388 JA |
317 | } |
318 | ||
b80f6443 JA |
319 | /* Return the flags corresponding to PID in the PID_LIST array. */ |
320 | static int | |
321 | get_pid_flags (pid) | |
322 | pid_t pid; | |
323 | { | |
324 | int slot; | |
325 | ||
326 | slot = find_index_by_pid (pid); | |
327 | if (slot == NO_PID) | |
328 | return 0; | |
329 | ||
330 | return (pid_list[slot].flags); | |
331 | } | |
332 | ||
726f6388 | 333 | static void |
bb70624e | 334 | add_pid (pid, async) |
726f6388 | 335 | pid_t pid; |
bb70624e | 336 | int async; |
726f6388 JA |
337 | { |
338 | int slot; | |
339 | ||
a0c0a00f | 340 | slot = find_proc_slot (pid); |
bb70624e | 341 | |
726f6388 | 342 | pid_list[slot].pid = pid; |
bb70624e JA |
343 | pid_list[slot].status = -1; |
344 | pid_list[slot].flags = PROC_RUNNING; | |
345 | if (async) | |
346 | pid_list[slot].flags |= PROC_ASYNC; | |
347 | } | |
348 | ||
349 | static void | |
350 | mark_dead_jobs_as_notified (force) | |
351 | int force; | |
352 | { | |
353 | register int i, ndead; | |
354 | ||
355 | /* first, count the number of non-running async jobs if FORCE == 0 */ | |
356 | for (i = ndead = 0; force == 0 && i < pid_list_size; i++) | |
357 | { | |
358 | if (pid_list[i].pid == NO_PID) | |
359 | continue; | |
360 | if (((pid_list[i].flags & PROC_RUNNING) == 0) && | |
361 | (pid_list[i].flags & PROC_ASYNC)) | |
28ef6c31 | 362 | ndead++; |
bb70624e JA |
363 | } |
364 | ||
7117c2d2 JA |
365 | if (child_max < 0) |
366 | child_max = getmaxchild (); | |
367 | if (child_max < 0) | |
368 | child_max = DEFAULT_CHILD_MAX; | |
369 | ||
370 | if (force == 0 && ndead <= child_max) | |
bb70624e JA |
371 | return; |
372 | ||
373 | /* If FORCE == 0, we just mark as many non-running async jobs as notified | |
374 | to bring us under the CHILD_MAX limit. */ | |
375 | for (i = 0; i < pid_list_size; i++) | |
376 | { | |
377 | if (pid_list[i].pid == NO_PID) | |
378 | continue; | |
379 | if (((pid_list[i].flags & PROC_RUNNING) == 0) && | |
380 | pid_list[i].pid != last_asynchronous_pid) | |
381 | { | |
382 | pid_list[i].flags |= PROC_NOTIFIED; | |
7117c2d2 | 383 | if (force == 0 && (pid_list[i].flags & PROC_ASYNC) && --ndead <= child_max) |
bb70624e JA |
384 | break; |
385 | } | |
386 | } | |
726f6388 JA |
387 | } |
388 | ||
bb70624e | 389 | /* Remove all dead, notified jobs from the pid_list. */ |
726f6388 JA |
390 | int |
391 | cleanup_dead_jobs () | |
392 | { | |
393 | register int i; | |
394 | ||
ccc6cda3 | 395 | #if defined (HAVE_WAITPID) |
726f6388 JA |
396 | reap_zombie_children (); |
397 | #endif | |
398 | ||
399 | for (i = 0; i < pid_list_size; i++) | |
bb70624e | 400 | { |
d233b485 CR |
401 | if (pid_list[i].pid != NO_PID && |
402 | (pid_list[i].flags & PROC_RUNNING) == 0 && | |
403 | (pid_list[i].flags & PROC_NOTIFIED)) | |
bb70624e JA |
404 | pid_list[i].pid = NO_PID; |
405 | } | |
406 | ||
17345e5a JA |
407 | #if defined (COPROCESS_SUPPORT) |
408 | coproc_reap (); | |
409 | #endif | |
410 | ||
bb70624e JA |
411 | return 0; |
412 | } | |
413 | ||
414 | void | |
415 | reap_dead_jobs () | |
416 | { | |
417 | mark_dead_jobs_as_notified (0); | |
418 | cleanup_dead_jobs (); | |
726f6388 JA |
419 | } |
420 | ||
421 | /* Initialize the job control mechanism, and set up the tty stuff. */ | |
a0c0a00f | 422 | int |
d166f048 JA |
423 | initialize_job_control (force) |
424 | int force; | |
726f6388 | 425 | { |
d166f048 JA |
426 | shell_tty = fileno (stderr); |
427 | ||
428 | if (interactive) | |
429 | get_tty_state (); | |
a0c0a00f | 430 | return 0; |
726f6388 JA |
431 | } |
432 | ||
726f6388 JA |
433 | /* Setup this shell to handle C-C, etc. */ |
434 | void | |
435 | initialize_job_signals () | |
436 | { | |
437 | set_signal_handler (SIGINT, sigint_sighandler); | |
726f6388 JA |
438 | |
439 | /* If this is a login shell we don't wish to be disturbed by | |
440 | stop signals. */ | |
441 | if (login_shell) | |
ccc6cda3 | 442 | ignore_tty_job_signals (); |
726f6388 JA |
443 | } |
444 | ||
ccc6cda3 | 445 | #if defined (HAVE_WAITPID) |
726f6388 JA |
446 | /* Collect the status of all zombie children so that their system |
447 | resources can be deallocated. */ | |
448 | static void | |
449 | reap_zombie_children () | |
450 | { | |
b80f6443 | 451 | # if defined (WNOHANG) |
726f6388 JA |
452 | pid_t pid; |
453 | WAIT status; | |
454 | ||
0628567a | 455 | CHECK_TERMSIG; |
ac50fbac | 456 | CHECK_WAIT_INTR; |
726f6388 JA |
457 | while ((pid = waitpid (-1, (int *)&status, WNOHANG)) > 0) |
458 | set_pid_status (pid, status); | |
b80f6443 | 459 | # endif /* WNOHANG */ |
0628567a | 460 | CHECK_TERMSIG; |
ac50fbac | 461 | CHECK_WAIT_INTR; |
726f6388 | 462 | } |
b80f6443 JA |
463 | #endif /* WAITPID */ |
464 | ||
465 | #if !defined (HAVE_SIGINTERRUPT) && defined (HAVE_POSIX_SIGNALS) | |
ac50fbac CR |
466 | |
467 | #if !defined (SA_RESTART) | |
468 | # define SA_RESTART 0 | |
469 | #endif | |
470 | ||
b80f6443 JA |
471 | static int |
472 | siginterrupt (sig, flag) | |
473 | int sig, flag; | |
474 | { | |
475 | struct sigaction act; | |
476 | ||
477 | sigaction (sig, (struct sigaction *)NULL, &act); | |
478 | ||
479 | if (flag) | |
480 | act.sa_flags &= ~SA_RESTART; | |
481 | else | |
482 | act.sa_flags |= SA_RESTART; | |
483 | ||
484 | return (sigaction (sig, &act, (struct sigaction *)NULL)); | |
485 | } | |
486 | #endif /* !HAVE_SIGINTERRUPT && HAVE_POSIX_SIGNALS */ | |
726f6388 JA |
487 | |
488 | /* Fork, handling errors. Returns the pid of the newly made child, or 0. | |
489 | COMMAND is just for remembering the name of the command; we don't do | |
490 | anything else with it. ASYNC_P says what to do with the tty. If | |
491 | non-zero, then don't give it away. */ | |
492 | pid_t | |
8868edaf | 493 | make_child (command, flags) |
726f6388 | 494 | char *command; |
8868edaf | 495 | int flags; |
726f6388 JA |
496 | { |
497 | pid_t pid; | |
8868edaf CR |
498 | int async_p, forksleep; |
499 | sigset_t set, oset; | |
726f6388 JA |
500 | |
501 | /* Discard saved memory. */ | |
ccc6cda3 | 502 | if (command) |
726f6388 JA |
503 | free (command); |
504 | ||
8868edaf | 505 | async_p = (flags & FORK_ASYNC); |
726f6388 JA |
506 | start_pipeline (); |
507 | ||
508 | #if defined (BUFFERED_INPUT) | |
509 | /* If default_buffered_input is active, we are reading a script. If | |
510 | the command is asynchronous, we have already duplicated /dev/null | |
511 | as fd 0, but have not changed the buffered stream corresponding to | |
512 | the old fd 0. We don't want to sync the stream in this case. */ | |
cce855bc | 513 | if (default_buffered_input != -1 && (!async_p || default_buffered_input > 0)) |
726f6388 JA |
514 | sync_buffered_stream (default_buffered_input); |
515 | #endif /* BUFFERED_INPUT */ | |
516 | ||
8868edaf CR |
517 | /* Block SIGTERM here and unblock in child after fork resets the |
518 | set of pending signals */ | |
519 | if (interactive_shell) | |
520 | { | |
521 | sigemptyset (&set); | |
522 | sigaddset (&set, SIGTERM); | |
523 | sigemptyset (&oset); | |
524 | sigprocmask (SIG_BLOCK, &set, &oset); | |
525 | set_signal_handler (SIGTERM, SIG_DFL); | |
526 | } | |
ac50fbac | 527 | |
3185942a JA |
528 | /* Create the child, handle severe errors. Retry on EAGAIN. */ |
529 | forksleep = 1; | |
530 | while ((pid = fork ()) < 0 && errno == EAGAIN && forksleep < FORKSLEEP_MAX) | |
726f6388 | 531 | { |
3185942a | 532 | sys_error ("fork: retry"); |
ac50fbac | 533 | |
ccc6cda3 | 534 | #if defined (HAVE_WAITPID) |
726f6388 JA |
535 | /* Posix systems with a non-blocking waitpid () system call available |
536 | get another chance after zombies are reaped. */ | |
3185942a JA |
537 | reap_zombie_children (); |
538 | if (forksleep > 1 && sleep (forksleep) != 0) | |
539 | break; | |
540 | #else | |
541 | if (sleep (forksleep) != 0) | |
542 | break; | |
ccc6cda3 | 543 | #endif /* HAVE_WAITPID */ |
3185942a JA |
544 | forksleep <<= 1; |
545 | } | |
726f6388 | 546 | |
ac50fbac | 547 | if (pid != 0) |
8868edaf CR |
548 | if (interactive_shell) |
549 | { | |
550 | set_signal_handler (SIGTERM, SIG_IGN); | |
551 | sigprocmask (SIG_SETMASK, &oset, (sigset_t *)NULL); | |
552 | } | |
ac50fbac | 553 | |
3185942a JA |
554 | if (pid < 0) |
555 | { | |
ccc6cda3 | 556 | sys_error ("fork"); |
ac50fbac | 557 | last_command_exit_value = EX_NOEXEC; |
726f6388 JA |
558 | throw_to_top_level (); |
559 | } | |
ccc6cda3 | 560 | |
726f6388 JA |
561 | if (pid == 0) |
562 | { | |
563 | #if defined (BUFFERED_INPUT) | |
cce855bc | 564 | unset_bash_input (0); |
726f6388 JA |
565 | #endif /* BUFFERED_INPUT */ |
566 | ||
a0c0a00f CR |
567 | CLRINTERRUPT; /* XXX - children have their own interrupt state */ |
568 | ||
726f6388 | 569 | /* Restore top-level signal mask. */ |
8868edaf | 570 | restore_sigmask (); |
726f6388 | 571 | |
3185942a | 572 | #if 0 |
726f6388 JA |
573 | /* Ignore INT and QUIT in asynchronous children. */ |
574 | if (async_p) | |
ccc6cda3 | 575 | last_asynchronous_pid = getpid (); |
3185942a | 576 | #endif |
726f6388 | 577 | |
15409324 CR |
578 | subshell_environment |= SUBSHELL_IGNTRAP; |
579 | ||
ccc6cda3 | 580 | default_tty_job_signals (); |
726f6388 JA |
581 | } |
582 | else | |
583 | { | |
584 | /* In the parent. */ | |
585 | ||
586 | last_made_pid = pid; | |
587 | ||
588 | if (async_p) | |
589 | last_asynchronous_pid = pid; | |
590 | ||
bb70624e | 591 | add_pid (pid, async_p); |
726f6388 JA |
592 | } |
593 | return (pid); | |
594 | } | |
595 | ||
ccc6cda3 JA |
596 | void |
597 | ignore_tty_job_signals () | |
598 | { | |
599 | #if defined (SIGTSTP) | |
600 | set_signal_handler (SIGTSTP, SIG_IGN); | |
601 | set_signal_handler (SIGTTIN, SIG_IGN); | |
602 | set_signal_handler (SIGTTOU, SIG_IGN); | |
603 | #endif | |
604 | } | |
605 | ||
606 | void | |
607 | default_tty_job_signals () | |
608 | { | |
609 | #if defined (SIGTSTP) | |
a0c0a00f CR |
610 | if (signal_is_trapped (SIGTSTP) == 0 && signal_is_hard_ignored (SIGTSTP)) |
611 | set_signal_handler (SIGTSTP, SIG_IGN); | |
612 | else | |
613 | set_signal_handler (SIGTSTP, SIG_DFL); | |
614 | if (signal_is_trapped (SIGTTIN) == 0 && signal_is_hard_ignored (SIGTTIN)) | |
615 | set_signal_handler (SIGTTIN, SIG_IGN); | |
616 | else | |
617 | set_signal_handler (SIGTTIN, SIG_DFL); | |
618 | if (signal_is_trapped (SIGTTOU) == 0 && signal_is_hard_ignored (SIGTTOU)) | |
619 | set_signal_handler (SIGTTOU, SIG_IGN); | |
620 | else | |
621 | set_signal_handler (SIGTTOU, SIG_DFL); | |
622 | #endif | |
623 | } | |
624 | ||
625 | /* Called once in a parent process. */ | |
626 | void | |
627 | get_original_tty_job_signals () | |
628 | { | |
629 | static int fetched = 0; | |
630 | ||
631 | if (fetched == 0) | |
632 | { | |
633 | #if defined (SIGTSTP) | |
634 | if (interactive_shell) | |
635 | { | |
636 | set_original_signal (SIGTSTP, SIG_DFL); | |
637 | set_original_signal (SIGTTIN, SIG_DFL); | |
638 | set_original_signal (SIGTTOU, SIG_DFL); | |
639 | } | |
640 | else | |
641 | { | |
642 | get_original_signal (SIGTSTP); | |
643 | get_original_signal (SIGTTIN); | |
644 | get_original_signal (SIGTTOU); | |
645 | } | |
ccc6cda3 | 646 | #endif |
a0c0a00f CR |
647 | fetched = 1; |
648 | } | |
ccc6cda3 JA |
649 | } |
650 | ||
bb70624e JA |
651 | /* Wait for a single pid (PID) and return its exit status. Called by |
652 | the wait builtin. */ | |
f73dda09 | 653 | int |
a0c0a00f | 654 | wait_for_single_pid (pid, flags) |
726f6388 | 655 | pid_t pid; |
a0c0a00f | 656 | int flags; |
726f6388 JA |
657 | { |
658 | pid_t got_pid; | |
659 | WAIT status; | |
a0c0a00f | 660 | int pstatus; |
726f6388 JA |
661 | |
662 | pstatus = find_status_by_pid (pid); | |
663 | ||
664 | if (pstatus == PROC_BAD) | |
ccc6cda3 | 665 | { |
b80f6443 | 666 | internal_error (_("wait: pid %ld is not a child of this shell"), (long)pid); |
74091dd4 | 667 | return (257); |
ccc6cda3 | 668 | } |
726f6388 JA |
669 | |
670 | if (pstatus != PROC_STILL_ALIVE) | |
b80f6443 JA |
671 | { |
672 | if (pstatus > 128) | |
673 | last_command_exit_signal = find_termsig_by_pid (pid); | |
674 | return (pstatus); | |
675 | } | |
726f6388 JA |
676 | |
677 | siginterrupt (SIGINT, 1); | |
678 | while ((got_pid = WAITPID (pid, &status, 0)) != pid) | |
679 | { | |
0628567a | 680 | CHECK_TERMSIG; |
ac50fbac | 681 | CHECK_WAIT_INTR; |
726f6388 JA |
682 | if (got_pid < 0) |
683 | { | |
684 | if (errno != EINTR && errno != ECHILD) | |
685 | { | |
686 | siginterrupt (SIGINT, 0); | |
ccc6cda3 | 687 | sys_error ("wait"); |
726f6388 JA |
688 | } |
689 | break; | |
690 | } | |
691 | else if (got_pid > 0) | |
28ef6c31 | 692 | set_pid_status (got_pid, status); |
726f6388 JA |
693 | } |
694 | ||
7117c2d2 JA |
695 | if (got_pid > 0) |
696 | { | |
697 | set_pid_status (got_pid, status); | |
698 | set_pid_flags (got_pid, PROC_NOTIFIED); | |
699 | } | |
bb70624e | 700 | |
726f6388 JA |
701 | siginterrupt (SIGINT, 0); |
702 | QUIT; | |
8868edaf | 703 | CHECK_WAIT_INTR; |
726f6388 | 704 | |
7117c2d2 | 705 | return (got_pid > 0 ? process_exit_status (status) : -1); |
726f6388 JA |
706 | } |
707 | ||
bb70624e JA |
708 | /* Wait for all of the shell's children to exit. Called by the `wait' |
709 | builtin. */ | |
74091dd4 | 710 | int |
8868edaf CR |
711 | wait_for_background_pids (ps) |
712 | struct procstat *ps; | |
726f6388 JA |
713 | { |
714 | pid_t got_pid; | |
715 | WAIT status; | |
74091dd4 | 716 | int njobs; |
726f6388 JA |
717 | |
718 | /* If we aren't using job control, we let the kernel take care of the | |
ccc6cda3 | 719 | bookkeeping for us. wait () will return -1 and set errno to ECHILD |
726f6388 JA |
720 | when there are no more unwaited-for child processes on both |
721 | 4.2 BSD-based and System V-based systems. */ | |
722 | ||
74091dd4 | 723 | njobs = 0; |
726f6388 JA |
724 | siginterrupt (SIGINT, 1); |
725 | ||
726 | /* Wait for ECHILD */ | |
8868edaf | 727 | waiting_for_child = 1; |
726f6388 | 728 | while ((got_pid = WAITPID (-1, &status, 0)) != -1) |
8868edaf CR |
729 | { |
730 | waiting_for_child = 0; | |
74091dd4 | 731 | njobs++; |
8868edaf CR |
732 | set_pid_status (got_pid, status); |
733 | if (ps) | |
734 | { | |
735 | ps->pid = got_pid; | |
736 | ps->status = process_exit_status (status); | |
737 | } | |
738 | waiting_for_child = 1; | |
739 | CHECK_WAIT_INTR; | |
740 | } | |
741 | waiting_for_child = 0; | |
726f6388 JA |
742 | |
743 | if (errno != EINTR && errno != ECHILD) | |
744 | { | |
745 | siginterrupt (SIGINT, 0); | |
ccc6cda3 | 746 | sys_error("wait"); |
726f6388 JA |
747 | } |
748 | ||
749 | siginterrupt (SIGINT, 0); | |
750 | QUIT; | |
8868edaf | 751 | CHECK_WAIT_INTR; |
bb70624e JA |
752 | |
753 | mark_dead_jobs_as_notified (1); | |
754 | cleanup_dead_jobs (); | |
74091dd4 CR |
755 | |
756 | return njobs; | |
bb70624e JA |
757 | } |
758 | ||
a0c0a00f CR |
759 | void |
760 | wait_sigint_cleanup () | |
761 | { | |
762 | } | |
763 | ||
bb70624e JA |
764 | /* Make OLD_SIGINT_HANDLER the SIGINT signal handler. */ |
765 | #define INVALID_SIGNAL_HANDLER (SigHandler *)wait_for_background_pids | |
766 | static SigHandler *old_sigint_handler = INVALID_SIGNAL_HANDLER; | |
767 | ||
768 | static void | |
769 | restore_sigint_handler () | |
770 | { | |
771 | if (old_sigint_handler != INVALID_SIGNAL_HANDLER) | |
772 | { | |
773 | set_signal_handler (SIGINT, old_sigint_handler); | |
774 | old_sigint_handler = INVALID_SIGNAL_HANDLER; | |
775 | } | |
726f6388 JA |
776 | } |
777 | ||
778 | /* Handle SIGINT while we are waiting for children in a script to exit. | |
779 | All interrupts are effectively ignored by the shell, but allowed to | |
780 | kill a running job. */ | |
781 | static sighandler | |
782 | wait_sigint_handler (sig) | |
783 | int sig; | |
784 | { | |
bb70624e JA |
785 | SigHandler *sigint_handler; |
786 | ||
787 | /* If we got a SIGINT while in `wait', and SIGINT is trapped, do | |
788 | what POSIX.2 says (see builtins/wait.def for more info). */ | |
789 | if (this_shell_builtin && this_shell_builtin == wait_builtin && | |
790 | signal_is_trapped (SIGINT) && | |
791 | ((sigint_handler = trap_to_sighandler (SIGINT)) == trap_handler)) | |
792 | { | |
ac50fbac | 793 | last_command_exit_value = 128+SIGINT; |
bb70624e | 794 | restore_sigint_handler (); |
bb70624e | 795 | trap_handler (SIGINT); /* set pending_traps[SIGINT] */ |
7117c2d2 | 796 | wait_signal_received = SIGINT; |
ac50fbac | 797 | SIGRETURN (0); |
bb70624e JA |
798 | } |
799 | ||
bb70624e JA |
800 | wait_sigint_received = 1; |
801 | ||
ccc6cda3 | 802 | SIGRETURN (0); |
726f6388 JA |
803 | } |
804 | ||
b80f6443 JA |
805 | static char * |
806 | j_strsignal (s) | |
807 | int s; | |
808 | { | |
809 | static char retcode_name_buffer[64] = { '\0' }; | |
810 | char *x; | |
811 | ||
812 | x = strsignal (s); | |
813 | if (x == 0) | |
814 | { | |
815 | x = retcode_name_buffer; | |
816 | sprintf (x, "Signal %d", s); | |
817 | } | |
818 | return x; | |
819 | } | |
820 | ||
726f6388 JA |
821 | /* Wait for pid (one of our children) to terminate. This is called only |
822 | by the execution code in execute_cmd.c. */ | |
823 | int | |
8868edaf | 824 | wait_for (pid, flags) |
726f6388 | 825 | pid_t pid; |
8868edaf | 826 | int flags; |
726f6388 JA |
827 | { |
828 | int return_val, pstatus; | |
829 | pid_t got_pid; | |
830 | WAIT status; | |
726f6388 JA |
831 | |
832 | pstatus = find_status_by_pid (pid); | |
833 | ||
834 | if (pstatus == PROC_BAD) | |
835 | return (0); | |
836 | ||
837 | if (pstatus != PROC_STILL_ALIVE) | |
b80f6443 JA |
838 | { |
839 | if (pstatus > 128) | |
840 | last_command_exit_signal = find_termsig_by_pid (pid); | |
841 | return (pstatus); | |
842 | } | |
726f6388 JA |
843 | |
844 | /* If we are running a script, ignore SIGINT while we're waiting for | |
845 | a child to exit. The loop below does some of this, but not all. */ | |
bb70624e JA |
846 | wait_sigint_received = 0; |
847 | if (interactive_shell == 0) | |
726f6388 JA |
848 | old_sigint_handler = set_signal_handler (SIGINT, wait_sigint_handler); |
849 | ||
8868edaf CR |
850 | waiting_for_child = 1; |
851 | CHECK_WAIT_INTR; | |
726f6388 JA |
852 | while ((got_pid = WAITPID (-1, &status, 0)) != pid) /* XXX was pid now -1 */ |
853 | { | |
8868edaf | 854 | waiting_for_child = 0; |
0628567a | 855 | CHECK_TERMSIG; |
ac50fbac | 856 | CHECK_WAIT_INTR; |
726f6388 JA |
857 | if (got_pid < 0 && errno == ECHILD) |
858 | { | |
859 | #if !defined (_POSIX_VERSION) | |
860 | status.w_termsig = status.w_retcode = 0; | |
861 | #else | |
862 | status = 0; | |
863 | #endif /* _POSIX_VERSION */ | |
864 | break; | |
865 | } | |
866 | else if (got_pid < 0 && errno != EINTR) | |
f73dda09 | 867 | programming_error ("wait_for(%ld): %s", (long)pid, strerror(errno)); |
726f6388 JA |
868 | else if (got_pid > 0) |
869 | set_pid_status (got_pid, status); | |
8868edaf | 870 | waiting_for_child = 1; |
726f6388 | 871 | } |
8868edaf | 872 | waiting_for_child = 0; |
726f6388 | 873 | |
7117c2d2 JA |
874 | if (got_pid > 0) |
875 | set_pid_status (got_pid, status); | |
726f6388 | 876 | |
ccc6cda3 | 877 | #if defined (HAVE_WAITPID) |
726f6388 JA |
878 | if (got_pid >= 0) |
879 | reap_zombie_children (); | |
ccc6cda3 | 880 | #endif /* HAVE_WAITPID */ |
726f6388 | 881 | |
ac50fbac CR |
882 | CHECK_TERMSIG; |
883 | CHECK_WAIT_INTR; | |
884 | ||
ccc6cda3 | 885 | if (interactive_shell == 0) |
726f6388 | 886 | { |
bb70624e JA |
887 | SigHandler *temp_handler; |
888 | ||
889 | temp_handler = old_sigint_handler; | |
890 | restore_sigint_handler (); | |
891 | ||
726f6388 JA |
892 | /* If the job exited because of SIGINT, make sure the shell acts as if |
893 | it had received one also. */ | |
894 | if (WIFSIGNALED (status) && (WTERMSIG (status) == SIGINT)) | |
895 | { | |
bb70624e | 896 | |
726f6388 | 897 | if (maybe_call_trap_handler (SIGINT) == 0) |
bb70624e JA |
898 | { |
899 | if (temp_handler == SIG_DFL) | |
0628567a | 900 | termsig_handler (SIGINT); |
bb70624e JA |
901 | else if (temp_handler != INVALID_SIGNAL_HANDLER && temp_handler != SIG_IGN) |
902 | (*temp_handler) (SIGINT); | |
903 | } | |
726f6388 JA |
904 | } |
905 | } | |
ccc6cda3 | 906 | |
726f6388 JA |
907 | /* Default return value. */ |
908 | /* ``a full 8 bits of status is returned'' */ | |
bb70624e | 909 | return_val = process_exit_status (status); |
b80f6443 | 910 | last_command_exit_signal = get_termsig (status); |
ccc6cda3 | 911 | |
ac50fbac CR |
912 | #if defined (DONT_REPORT_SIGPIPE) && defined (DONT_REPORT_SIGTERM) |
913 | # define REPORTSIG(x) ((x) != SIGINT && (x) != SIGPIPE && (x) != SIGTERM) | |
914 | #elif !defined (DONT_REPORT_SIGPIPE) && !defined (DONT_REPORT_SIGTERM) | |
915 | # define REPORTSIG(x) ((x) != SIGINT) | |
916 | #elif defined (DONT_REPORT_SIGPIPE) | |
917 | # define REPORTSIG(x) ((x) != SIGINT && (x) != SIGPIPE) | |
d166f048 | 918 | #else |
ac50fbac | 919 | # define REPORTSIG(x) ((x) != SIGINT && (x) != SIGTERM) |
d166f048 | 920 | #endif |
ac50fbac CR |
921 | |
922 | if ((WIFSTOPPED (status) == 0) && WIFSIGNALED (status) && REPORTSIG(WTERMSIG (status))) | |
726f6388 | 923 | { |
b80f6443 | 924 | fprintf (stderr, "%s", j_strsignal (WTERMSIG (status))); |
726f6388 | 925 | if (WIFCORED (status)) |
3185942a | 926 | fprintf (stderr, _(" (core dumped)")); |
726f6388 JA |
927 | fprintf (stderr, "\n"); |
928 | } | |
929 | ||
ccc6cda3 | 930 | if (interactive_shell && subshell_environment == 0) |
726f6388 JA |
931 | { |
932 | if (WIFSIGNALED (status) || WIFSTOPPED (status)) | |
933 | set_tty_state (); | |
934 | else | |
935 | get_tty_state (); | |
936 | } | |
ac50fbac CR |
937 | else if (interactive_shell == 0 && subshell_environment == 0 && check_window_size) |
938 | get_new_window_size (0, (int *)0, (int *)0); | |
726f6388 JA |
939 | |
940 | return (return_val); | |
941 | } | |
942 | ||
95732b49 JA |
943 | /* Send PID SIGNAL. Returns -1 on failure, 0 on success. If GROUP is non-zero, |
944 | or PID is less than -1, then kill the process group associated with PID. */ | |
726f6388 JA |
945 | int |
946 | kill_pid (pid, signal, group) | |
947 | pid_t pid; | |
948 | int signal, group; | |
949 | { | |
950 | int result; | |
951 | ||
95732b49 JA |
952 | if (pid < -1) |
953 | { | |
954 | pid = -pid; | |
955 | group = 1; | |
956 | } | |
bb70624e | 957 | result = group ? killpg (pid, signal) : kill (pid, signal); |
726f6388 JA |
958 | return (result); |
959 | } | |
960 | ||
bb70624e | 961 | static TTYSTRUCT shell_tty_info; |
ccc6cda3 | 962 | static int got_tty_state; |
726f6388 JA |
963 | |
964 | /* Fill the contents of shell_tty_info with the current tty info. */ | |
a0c0a00f | 965 | int |
726f6388 JA |
966 | get_tty_state () |
967 | { | |
ccc6cda3 JA |
968 | int tty; |
969 | ||
d166f048 | 970 | tty = input_tty (); |
726f6388 JA |
971 | if (tty != -1) |
972 | { | |
bb70624e | 973 | ttgetattr (tty, &shell_tty_info); |
726f6388 | 974 | got_tty_state = 1; |
ccc6cda3 | 975 | if (check_window_size) |
95732b49 | 976 | get_new_window_size (0, (int *)0, (int *)0); |
726f6388 | 977 | } |
a0c0a00f | 978 | return 0; |
726f6388 JA |
979 | } |
980 | ||
981 | /* Make the current tty use the state in shell_tty_info. */ | |
b72432fd | 982 | int |
726f6388 JA |
983 | set_tty_state () |
984 | { | |
ccc6cda3 JA |
985 | int tty; |
986 | ||
d166f048 | 987 | tty = input_tty (); |
726f6388 JA |
988 | if (tty != -1) |
989 | { | |
ccc6cda3 | 990 | if (got_tty_state == 0) |
b72432fd | 991 | return 0; |
bb70624e | 992 | ttsetattr (tty, &shell_tty_info); |
726f6388 | 993 | } |
b72432fd | 994 | return 0; |
726f6388 JA |
995 | } |
996 | ||
997 | /* Give the terminal to PGRP. */ | |
a0c0a00f | 998 | int |
28ef6c31 | 999 | give_terminal_to (pgrp, force) |
726f6388 | 1000 | pid_t pgrp; |
28ef6c31 | 1001 | int force; |
726f6388 | 1002 | { |
a0c0a00f | 1003 | return 0; |
726f6388 JA |
1004 | } |
1005 | ||
1006 | /* Stop a pipeline. */ | |
f73dda09 | 1007 | int |
726f6388 JA |
1008 | stop_pipeline (async, ignore) |
1009 | int async; | |
1010 | COMMAND *ignore; | |
1011 | { | |
1012 | already_making_children = 0; | |
f73dda09 | 1013 | return 0; |
726f6388 JA |
1014 | } |
1015 | ||
1016 | void | |
1017 | start_pipeline () | |
1018 | { | |
1019 | already_making_children = 1; | |
1020 | } | |
1021 | ||
f73dda09 JA |
1022 | void |
1023 | stop_making_children () | |
1024 | { | |
1025 | already_making_children = 0; | |
1026 | } | |
1027 | ||
a0c0a00f CR |
1028 | /* The name is kind of a misnomer, but it's what the job control code uses. */ |
1029 | void | |
1030 | without_job_control () | |
1031 | { | |
1032 | stop_making_children (); | |
1033 | last_made_pid = NO_PID; /* XXX */ | |
1034 | } | |
1035 | ||
d166f048 | 1036 | int |
8868edaf | 1037 | get_job_by_pid (pid, block, ignore) |
d166f048 JA |
1038 | pid_t pid; |
1039 | int block; | |
8868edaf | 1040 | PROCESS **ignore; |
d166f048 JA |
1041 | { |
1042 | int i; | |
1043 | ||
1044 | i = find_index_by_pid (pid); | |
1045 | return ((i == NO_PID) ? PROC_BAD : i); | |
1046 | } | |
1047 | ||
726f6388 JA |
1048 | /* Print descriptive information about the job with leader pid PID. */ |
1049 | void | |
1050 | describe_pid (pid) | |
1051 | pid_t pid; | |
1052 | { | |
f73dda09 | 1053 | fprintf (stderr, "%ld\n", (long) pid); |
726f6388 | 1054 | } |
ccc6cda3 | 1055 | |
a0c0a00f | 1056 | int |
495aee44 CR |
1057 | freeze_jobs_list () |
1058 | { | |
a0c0a00f | 1059 | return 0; |
495aee44 CR |
1060 | } |
1061 | ||
ccc6cda3 JA |
1062 | void |
1063 | unfreeze_jobs_list () | |
1064 | { | |
1065 | } | |
bb70624e | 1066 | |
d233b485 CR |
1067 | void |
1068 | set_jobs_list_frozen (s) | |
1069 | int s; | |
1070 | { | |
1071 | } | |
1072 | ||
bb70624e JA |
1073 | int |
1074 | count_all_jobs () | |
1075 | { | |
1076 | return 0; | |
1077 | } |