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Commit | Line | Data |
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2e4498b3 | 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 | |
51f7ea36 | 6 | /* Copyright (C) 1987-2011 Free Software Foundation, Inc. |
726f6388 JA |
7 | |
8 | This file is part of GNU Bash, the Bourne Again SHell. | |
9 | ||
2e4498b3 CR |
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 | |
2e4498b3 CR |
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 | |
2e4498b3 CR |
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 | |
5e13499c CR |
44 | #include "bashintl.h" |
45 | ||
bb70624e JA |
46 | #include "shell.h" |
47 | #include "jobs.h" | |
e141c35a | 48 | #include "execute_cmd.h" |
bb70624e JA |
49 | |
50 | #include "builtins/builtext.h" /* for wait_builtin */ | |
51 | ||
7117c2d2 | 52 | #define DEFAULT_CHILD_MAX 32 |
bb70624e | 53 | |
ccc6cda3 | 54 | #if defined (_POSIX_VERSION) || !defined (HAVE_KILLPG) |
726f6388 JA |
55 | # define killpg(pg, sig) kill(-(pg),(sig)) |
56 | #endif /* USG || _POSIX_VERSION */ | |
57 | ||
5e13499c | 58 | #if !defined (HAVE_SIGINTERRUPT) && !defined (HAVE_POSIX_SIGNALS) |
726f6388 | 59 | # define siginterrupt(sig, code) |
5e13499c | 60 | #endif /* !HAVE_SIGINTERRUPT && !HAVE_POSIX_SIGNALS */ |
726f6388 | 61 | |
ccc6cda3 | 62 | #if defined (HAVE_WAITPID) |
726f6388 JA |
63 | # define WAITPID(pid, statusp, options) waitpid (pid, statusp, options) |
64 | #else | |
65 | # define WAITPID(pid, statusp, options) wait (statusp) | |
ccc6cda3 | 66 | #endif /* !HAVE_WAITPID */ |
726f6388 | 67 | |
d166f048 JA |
68 | /* Return the fd from which we are actually getting input. */ |
69 | #define input_tty() (shell_tty != -1) ? shell_tty : fileno (stderr) | |
70 | ||
726f6388 JA |
71 | #if !defined (errno) |
72 | extern int errno; | |
73 | #endif /* !errno */ | |
74 | ||
75 | extern int interactive, interactive_shell, login_shell; | |
76 | extern int subshell_environment; | |
d3a24ed2 | 77 | extern int last_command_exit_value, last_command_exit_signal; |
bb70624e | 78 | extern int interrupt_immediately; |
f73dda09 | 79 | extern sh_builtin_func_t *this_shell_builtin; |
ccc6cda3 | 80 | #if defined (HAVE_POSIX_SIGNALS) |
726f6388 JA |
81 | extern sigset_t top_level_mask; |
82 | #endif | |
bb70624e | 83 | extern procenv_t wait_intr_buf; |
54a5fbe1 | 84 | extern int wait_intr_flag; |
7117c2d2 | 85 | extern int wait_signal_received; |
726f6388 | 86 | |
c2fa6583 CR |
87 | volatile pid_t last_made_pid = NO_PID; |
88 | volatile pid_t last_asynchronous_pid = NO_PID; | |
726f6388 | 89 | |
96f66efe CR |
90 | static int queue_sigchld, waiting_for_child; /* dummy declarations */ |
91 | ||
726f6388 JA |
92 | /* Call this when you start making children. */ |
93 | int already_making_children = 0; | |
94 | ||
d166f048 JA |
95 | /* The controlling tty for this shell. */ |
96 | int shell_tty = -1; | |
97 | ||
ccc6cda3 JA |
98 | /* If this is non-zero, $LINES and $COLUMNS are reset after every process |
99 | exits from get_tty_state(). */ | |
278286c9 | 100 | int check_window_size = CHECKWINSIZE_DEFAULT; |
ccc6cda3 | 101 | |
c74f63f3 CR |
102 | /* We don't have job control. */ |
103 | int job_control = 0; | |
104 | ||
581fe589 CR |
105 | int running_in_background = 0; /* can't tell without job control */ |
106 | ||
bb70624e JA |
107 | /* STATUS and FLAGS are only valid if pid != NO_PID |
108 | STATUS is only valid if (flags & PROC_RUNNING) == 0 */ | |
726f6388 JA |
109 | struct proc_status { |
110 | pid_t pid; | |
111 | int status; /* Exit status of PID or 128 + fatal signal number */ | |
bb70624e | 112 | int flags; |
726f6388 JA |
113 | }; |
114 | ||
bb70624e JA |
115 | /* Values for proc_status.flags */ |
116 | #define PROC_RUNNING 0x01 | |
117 | #define PROC_NOTIFIED 0x02 | |
118 | #define PROC_ASYNC 0x04 | |
d3a24ed2 | 119 | #define PROC_SIGNALED 0x10 |
bb70624e | 120 | |
bb70624e JA |
121 | /* Return values from find_status_by_pid */ |
122 | #define PROC_BAD -1 | |
726f6388 JA |
123 | #define PROC_STILL_ALIVE -2 |
124 | ||
f73dda09 JA |
125 | static struct proc_status *pid_list = (struct proc_status *)NULL; |
126 | static int pid_list_size; | |
127 | static int wait_sigint_received; | |
128 | ||
7117c2d2 JA |
129 | static long child_max = -1L; |
130 | ||
f73dda09 | 131 | static void alloc_pid_list __P((void)); |
bd6a350e | 132 | static int find_proc_slot __P((pid_t)); |
f73dda09 JA |
133 | static int find_index_by_pid __P((pid_t)); |
134 | static int find_status_by_pid __P((pid_t)); | |
135 | static int process_exit_status __P((WAIT)); | |
d3a24ed2 CR |
136 | static int find_termsig_by_pid __P((pid_t)); |
137 | static int get_termsig __P((WAIT)); | |
f73dda09 JA |
138 | static void set_pid_status __P((pid_t, WAIT)); |
139 | static void set_pid_flags __P((pid_t, int)); | |
140 | static void unset_pid_flags __P((pid_t, int)); | |
d3a24ed2 | 141 | static int get_pid_flags __P((pid_t)); |
f73dda09 JA |
142 | static void add_pid __P((pid_t, int)); |
143 | static void mark_dead_jobs_as_notified __P((int)); | |
144 | ||
7117c2d2 | 145 | static sighandler wait_sigint_handler __P((int)); |
d3a24ed2 | 146 | static char *j_strsignal __P((int)); |
f73dda09 JA |
147 | |
148 | #if defined (HAVE_WAITPID) | |
149 | static void reap_zombie_children __P((void)); | |
150 | #endif | |
151 | ||
5e13499c CR |
152 | #if !defined (HAVE_SIGINTERRUPT) && defined (HAVE_POSIX_SIGNALS) |
153 | static int siginterrupt __P((int, int)); | |
154 | #endif | |
155 | ||
f73dda09 JA |
156 | static void restore_sigint_handler __P((void)); |
157 | ||
726f6388 JA |
158 | /* Allocate new, or grow existing PID_LIST. */ |
159 | static void | |
160 | alloc_pid_list () | |
161 | { | |
162 | register int i; | |
163 | int old = pid_list_size; | |
164 | ||
165 | pid_list_size += 10; | |
f73dda09 | 166 | pid_list = (struct proc_status *)xrealloc (pid_list, pid_list_size * sizeof (struct proc_status)); |
726f6388 JA |
167 | |
168 | /* None of the newly allocated slots have process id's yet. */ | |
169 | for (i = old; i < pid_list_size; i++) | |
ccc6cda3 | 170 | pid_list[i].pid = NO_PID; |
726f6388 JA |
171 | } |
172 | ||
173 | /* Return the offset within the PID_LIST array of an empty slot. This can | |
174 | create new slots if all of the existing slots are taken. */ | |
175 | static int | |
bd6a350e CR |
176 | find_proc_slot (pid) |
177 | pid_t pid; | |
726f6388 JA |
178 | { |
179 | register int i; | |
180 | ||
181 | for (i = 0; i < pid_list_size; i++) | |
bd6a350e | 182 | if (pid_list[i].pid == NO_PID || pid_list[i].pid == pid) |
726f6388 JA |
183 | return (i); |
184 | ||
185 | if (i == pid_list_size) | |
186 | alloc_pid_list (); | |
187 | ||
188 | return (i); | |
189 | } | |
190 | ||
191 | /* Return the offset within the PID_LIST array of a slot containing PID, | |
192 | or the value NO_PID if the pid wasn't found. */ | |
193 | static int | |
194 | find_index_by_pid (pid) | |
195 | pid_t pid; | |
196 | { | |
197 | register int i; | |
198 | ||
199 | for (i = 0; i < pid_list_size; i++) | |
200 | if (pid_list[i].pid == pid) | |
201 | return (i); | |
202 | ||
203 | return (NO_PID); | |
204 | } | |
205 | ||
206 | /* Return the status of PID as looked up in the PID_LIST array. A | |
207 | return value of PROC_BAD indicates that PID wasn't found. */ | |
208 | static int | |
209 | find_status_by_pid (pid) | |
210 | pid_t pid; | |
211 | { | |
212 | int i; | |
213 | ||
214 | i = find_index_by_pid (pid); | |
215 | if (i == NO_PID) | |
216 | return (PROC_BAD); | |
bb70624e JA |
217 | if (pid_list[i].flags & PROC_RUNNING) |
218 | return (PROC_STILL_ALIVE); | |
726f6388 JA |
219 | return (pid_list[i].status); |
220 | } | |
221 | ||
bb70624e JA |
222 | static int |
223 | process_exit_status (status) | |
224 | WAIT status; | |
225 | { | |
226 | if (WIFSIGNALED (status)) | |
227 | return (128 + WTERMSIG (status)); | |
228 | else | |
229 | return (WEXITSTATUS (status)); | |
230 | } | |
231 | ||
d3a24ed2 CR |
232 | /* Return the status of PID as looked up in the PID_LIST array. A |
233 | return value of PROC_BAD indicates that PID wasn't found. */ | |
234 | static int | |
235 | find_termsig_by_pid (pid) | |
236 | pid_t pid; | |
237 | { | |
238 | int i; | |
239 | ||
240 | i = find_index_by_pid (pid); | |
241 | if (i == NO_PID) | |
242 | return (0); | |
243 | if (pid_list[i].flags & PROC_RUNNING) | |
244 | return (0); | |
e77a3058 | 245 | return (get_termsig ((WAIT)pid_list[i].status)); |
d3a24ed2 CR |
246 | } |
247 | ||
248 | /* Set LAST_COMMAND_EXIT_SIGNAL depending on STATUS. If STATUS is -1, look | |
249 | up PID in the pid array and set LAST_COMMAND_EXIT_SIGNAL appropriately | |
250 | depending on its flags and exit status. */ | |
251 | static int | |
252 | get_termsig (status) | |
253 | WAIT status; | |
254 | { | |
255 | if (WIFSTOPPED (status) == 0 && WIFSIGNALED (status)) | |
256 | return (WTERMSIG (status)); | |
257 | else | |
258 | return (0); | |
259 | } | |
260 | ||
726f6388 JA |
261 | /* Give PID the status value STATUS in the PID_LIST array. */ |
262 | static void | |
263 | set_pid_status (pid, status) | |
264 | pid_t pid; | |
265 | WAIT status; | |
266 | { | |
267 | int slot; | |
268 | ||
e141c35a CR |
269 | #if defined (COPROCESS_SUPPORT) |
270 | coproc_pidchk (pid, status); | |
271 | #endif | |
272 | ||
726f6388 JA |
273 | slot = find_index_by_pid (pid); |
274 | if (slot == NO_PID) | |
275 | return; | |
276 | ||
bb70624e JA |
277 | pid_list[slot].status = process_exit_status (status); |
278 | pid_list[slot].flags &= ~PROC_RUNNING; | |
d3a24ed2 CR |
279 | if (WIFSIGNALED (status)) |
280 | pid_list[slot].flags |= PROC_SIGNALED; | |
bb70624e JA |
281 | /* If it's not a background process, mark it as notified so it gets |
282 | cleaned up. */ | |
283 | if ((pid_list[slot].flags & PROC_ASYNC) == 0) | |
284 | pid_list[slot].flags |= PROC_NOTIFIED; | |
285 | } | |
286 | ||
287 | /* Give PID the flags FLAGS in the PID_LIST array. */ | |
288 | static void | |
289 | set_pid_flags (pid, flags) | |
290 | pid_t pid; | |
291 | int flags; | |
292 | { | |
293 | int slot; | |
294 | ||
295 | slot = find_index_by_pid (pid); | |
296 | if (slot == NO_PID) | |
297 | return; | |
298 | ||
299 | pid_list[slot].flags |= flags; | |
300 | } | |
301 | ||
302 | /* Unset FLAGS for PID in the pid list */ | |
303 | static void | |
304 | unset_pid_flags (pid, flags) | |
305 | pid_t pid; | |
306 | int flags; | |
307 | { | |
308 | int slot; | |
309 | ||
310 | slot = find_index_by_pid (pid); | |
311 | if (slot == NO_PID) | |
312 | return; | |
313 | ||
314 | pid_list[slot].flags &= ~flags; | |
726f6388 JA |
315 | } |
316 | ||
d3a24ed2 CR |
317 | /* Return the flags corresponding to PID in the PID_LIST array. */ |
318 | static int | |
319 | get_pid_flags (pid) | |
320 | pid_t pid; | |
321 | { | |
322 | int slot; | |
323 | ||
324 | slot = find_index_by_pid (pid); | |
325 | if (slot == NO_PID) | |
326 | return 0; | |
327 | ||
328 | return (pid_list[slot].flags); | |
329 | } | |
330 | ||
726f6388 | 331 | static void |
bb70624e | 332 | add_pid (pid, async) |
726f6388 | 333 | pid_t pid; |
bb70624e | 334 | int async; |
726f6388 JA |
335 | { |
336 | int slot; | |
337 | ||
bd6a350e | 338 | slot = find_proc_slot (pid); |
bb70624e | 339 | |
726f6388 | 340 | pid_list[slot].pid = pid; |
bb70624e JA |
341 | pid_list[slot].status = -1; |
342 | pid_list[slot].flags = PROC_RUNNING; | |
343 | if (async) | |
344 | pid_list[slot].flags |= PROC_ASYNC; | |
345 | } | |
346 | ||
347 | static void | |
348 | mark_dead_jobs_as_notified (force) | |
349 | int force; | |
350 | { | |
351 | register int i, ndead; | |
352 | ||
353 | /* first, count the number of non-running async jobs if FORCE == 0 */ | |
354 | for (i = ndead = 0; force == 0 && i < pid_list_size; i++) | |
355 | { | |
356 | if (pid_list[i].pid == NO_PID) | |
357 | continue; | |
358 | if (((pid_list[i].flags & PROC_RUNNING) == 0) && | |
359 | (pid_list[i].flags & PROC_ASYNC)) | |
28ef6c31 | 360 | ndead++; |
bb70624e JA |
361 | } |
362 | ||
7117c2d2 JA |
363 | if (child_max < 0) |
364 | child_max = getmaxchild (); | |
365 | if (child_max < 0) | |
366 | child_max = DEFAULT_CHILD_MAX; | |
367 | ||
368 | if (force == 0 && ndead <= child_max) | |
bb70624e JA |
369 | return; |
370 | ||
371 | /* If FORCE == 0, we just mark as many non-running async jobs as notified | |
372 | to bring us under the CHILD_MAX limit. */ | |
373 | for (i = 0; i < pid_list_size; i++) | |
374 | { | |
375 | if (pid_list[i].pid == NO_PID) | |
376 | continue; | |
377 | if (((pid_list[i].flags & PROC_RUNNING) == 0) && | |
378 | pid_list[i].pid != last_asynchronous_pid) | |
379 | { | |
380 | pid_list[i].flags |= PROC_NOTIFIED; | |
7117c2d2 | 381 | if (force == 0 && (pid_list[i].flags & PROC_ASYNC) && --ndead <= child_max) |
bb70624e JA |
382 | break; |
383 | } | |
384 | } | |
726f6388 JA |
385 | } |
386 | ||
bb70624e | 387 | /* Remove all dead, notified jobs from the pid_list. */ |
726f6388 JA |
388 | int |
389 | cleanup_dead_jobs () | |
390 | { | |
391 | register int i; | |
392 | ||
ccc6cda3 | 393 | #if defined (HAVE_WAITPID) |
726f6388 JA |
394 | reap_zombie_children (); |
395 | #endif | |
396 | ||
397 | for (i = 0; i < pid_list_size; i++) | |
bb70624e JA |
398 | { |
399 | if ((pid_list[i].flags & PROC_RUNNING) == 0 && | |
400 | (pid_list[i].flags & PROC_NOTIFIED)) | |
401 | pid_list[i].pid = NO_PID; | |
402 | } | |
403 | ||
e141c35a CR |
404 | #if defined (COPROCESS_SUPPORT) |
405 | coproc_reap (); | |
406 | #endif | |
407 | ||
bb70624e JA |
408 | return 0; |
409 | } | |
410 | ||
411 | void | |
412 | reap_dead_jobs () | |
413 | { | |
414 | mark_dead_jobs_as_notified (0); | |
415 | cleanup_dead_jobs (); | |
726f6388 JA |
416 | } |
417 | ||
418 | /* Initialize the job control mechanism, and set up the tty stuff. */ | |
d166f048 JA |
419 | initialize_job_control (force) |
420 | int force; | |
726f6388 | 421 | { |
d166f048 JA |
422 | shell_tty = fileno (stderr); |
423 | ||
424 | if (interactive) | |
425 | get_tty_state (); | |
726f6388 JA |
426 | } |
427 | ||
726f6388 JA |
428 | /* Setup this shell to handle C-C, etc. */ |
429 | void | |
430 | initialize_job_signals () | |
431 | { | |
432 | set_signal_handler (SIGINT, sigint_sighandler); | |
726f6388 JA |
433 | |
434 | /* If this is a login shell we don't wish to be disturbed by | |
435 | stop signals. */ | |
436 | if (login_shell) | |
ccc6cda3 | 437 | ignore_tty_job_signals (); |
726f6388 JA |
438 | } |
439 | ||
ccc6cda3 | 440 | #if defined (HAVE_WAITPID) |
726f6388 JA |
441 | /* Collect the status of all zombie children so that their system |
442 | resources can be deallocated. */ | |
443 | static void | |
444 | reap_zombie_children () | |
445 | { | |
5e13499c | 446 | # if defined (WNOHANG) |
726f6388 JA |
447 | pid_t pid; |
448 | WAIT status; | |
449 | ||
ac18b312 | 450 | CHECK_TERMSIG; |
dfc91666 | 451 | CHECK_WAIT_INTR; |
726f6388 JA |
452 | while ((pid = waitpid (-1, (int *)&status, WNOHANG)) > 0) |
453 | set_pid_status (pid, status); | |
5e13499c | 454 | # endif /* WNOHANG */ |
ac18b312 | 455 | CHECK_TERMSIG; |
dfc91666 | 456 | CHECK_WAIT_INTR; |
5e13499c CR |
457 | } |
458 | #endif /* WAITPID */ | |
459 | ||
460 | #if !defined (HAVE_SIGINTERRUPT) && defined (HAVE_POSIX_SIGNALS) | |
278286c9 CR |
461 | |
462 | #if !defined (SA_RESTART) | |
463 | # define SA_RESTART 0 | |
464 | #endif | |
465 | ||
5e13499c CR |
466 | static int |
467 | siginterrupt (sig, flag) | |
468 | int sig, flag; | |
469 | { | |
470 | struct sigaction act; | |
471 | ||
472 | sigaction (sig, (struct sigaction *)NULL, &act); | |
473 | ||
474 | if (flag) | |
475 | act.sa_flags &= ~SA_RESTART; | |
476 | else | |
477 | act.sa_flags |= SA_RESTART; | |
478 | ||
479 | return (sigaction (sig, &act, (struct sigaction *)NULL)); | |
726f6388 | 480 | } |
5e13499c | 481 | #endif /* !HAVE_SIGINTERRUPT && HAVE_POSIX_SIGNALS */ |
726f6388 JA |
482 | |
483 | /* Fork, handling errors. Returns the pid of the newly made child, or 0. | |
484 | COMMAND is just for remembering the name of the command; we don't do | |
485 | anything else with it. ASYNC_P says what to do with the tty. If | |
486 | non-zero, then don't give it away. */ | |
487 | pid_t | |
488 | make_child (command, async_p) | |
489 | char *command; | |
490 | int async_p; | |
491 | { | |
492 | pid_t pid; | |
79e6c7dc | 493 | int forksleep; |
726f6388 JA |
494 | |
495 | /* Discard saved memory. */ | |
ccc6cda3 | 496 | if (command) |
726f6388 JA |
497 | free (command); |
498 | ||
499 | start_pipeline (); | |
500 | ||
501 | #if defined (BUFFERED_INPUT) | |
502 | /* If default_buffered_input is active, we are reading a script. If | |
503 | the command is asynchronous, we have already duplicated /dev/null | |
504 | as fd 0, but have not changed the buffered stream corresponding to | |
505 | the old fd 0. We don't want to sync the stream in this case. */ | |
cce855bc | 506 | if (default_buffered_input != -1 && (!async_p || default_buffered_input > 0)) |
726f6388 JA |
507 | sync_buffered_stream (default_buffered_input); |
508 | #endif /* BUFFERED_INPUT */ | |
509 | ||
83509ab7 CR |
510 | /* XXX - block SIGTERM here and unblock in child after fork resets the |
511 | set of pending signals? */ | |
512 | RESET_SIGTERM; | |
513 | ||
79e6c7dc CR |
514 | /* Create the child, handle severe errors. Retry on EAGAIN. */ |
515 | forksleep = 1; | |
516 | while ((pid = fork ()) < 0 && errno == EAGAIN && forksleep < FORKSLEEP_MAX) | |
726f6388 | 517 | { |
79e6c7dc | 518 | sys_error ("fork: retry"); |
83509ab7 CR |
519 | RESET_SIGTERM; |
520 | ||
ccc6cda3 | 521 | #if defined (HAVE_WAITPID) |
726f6388 JA |
522 | /* Posix systems with a non-blocking waitpid () system call available |
523 | get another chance after zombies are reaped. */ | |
79e6c7dc CR |
524 | reap_zombie_children (); |
525 | if (forksleep > 1 && sleep (forksleep) != 0) | |
526 | break; | |
527 | #else | |
528 | if (sleep (forksleep) != 0) | |
529 | break; | |
ccc6cda3 | 530 | #endif /* HAVE_WAITPID */ |
79e6c7dc CR |
531 | forksleep <<= 1; |
532 | } | |
726f6388 | 533 | |
83509ab7 CR |
534 | if (pid != 0) |
535 | RESET_SIGTERM; | |
536 | ||
79e6c7dc CR |
537 | if (pid < 0) |
538 | { | |
ccc6cda3 | 539 | sys_error ("fork"); |
49cf7828 | 540 | last_command_exit_value = EX_NOEXEC; |
726f6388 JA |
541 | throw_to_top_level (); |
542 | } | |
ccc6cda3 | 543 | |
726f6388 JA |
544 | if (pid == 0) |
545 | { | |
546 | #if defined (BUFFERED_INPUT) | |
cce855bc | 547 | unset_bash_input (0); |
726f6388 JA |
548 | #endif /* BUFFERED_INPUT */ |
549 | ||
54a5fbe1 CR |
550 | CLRINTERRUPT; /* XXX - children have their own interrupt state */ |
551 | ||
ccc6cda3 | 552 | #if defined (HAVE_POSIX_SIGNALS) |
726f6388 JA |
553 | /* Restore top-level signal mask. */ |
554 | sigprocmask (SIG_SETMASK, &top_level_mask, (sigset_t *)NULL); | |
555 | #endif | |
556 | ||
d3ad40de | 557 | #if 0 |
726f6388 JA |
558 | /* Ignore INT and QUIT in asynchronous children. */ |
559 | if (async_p) | |
ccc6cda3 | 560 | last_asynchronous_pid = getpid (); |
d3ad40de | 561 | #endif |
726f6388 | 562 | |
ccc6cda3 | 563 | default_tty_job_signals (); |
726f6388 JA |
564 | } |
565 | else | |
566 | { | |
567 | /* In the parent. */ | |
568 | ||
569 | last_made_pid = pid; | |
570 | ||
571 | if (async_p) | |
572 | last_asynchronous_pid = pid; | |
573 | ||
bb70624e | 574 | add_pid (pid, async_p); |
726f6388 JA |
575 | } |
576 | return (pid); | |
577 | } | |
578 | ||
ccc6cda3 JA |
579 | void |
580 | ignore_tty_job_signals () | |
581 | { | |
582 | #if defined (SIGTSTP) | |
583 | set_signal_handler (SIGTSTP, SIG_IGN); | |
584 | set_signal_handler (SIGTTIN, SIG_IGN); | |
585 | set_signal_handler (SIGTTOU, SIG_IGN); | |
586 | #endif | |
587 | } | |
588 | ||
589 | void | |
590 | default_tty_job_signals () | |
591 | { | |
592 | #if defined (SIGTSTP) | |
b4a00022 CR |
593 | if (signal_is_trapped (SIGTSTP) == 0 && signal_is_hard_ignored (SIGTSTP)) |
594 | set_signal_handler (SIGTSTP, SIG_IGN); | |
595 | else | |
596 | set_signal_handler (SIGTSTP, SIG_DFL); | |
597 | if (signal_is_trapped (SIGTTIN) == 0 && signal_is_hard_ignored (SIGTTIN)) | |
598 | set_signal_handler (SIGTTIN, SIG_IGN); | |
599 | else | |
600 | set_signal_handler (SIGTTIN, SIG_DFL); | |
601 | if (signal_is_trapped (SIGTTOU) == 0 && signal_is_hard_ignored (SIGTTOU)) | |
602 | set_signal_handler (SIGTTOU, SIG_IGN); | |
603 | else | |
604 | set_signal_handler (SIGTTOU, SIG_DFL); | |
605 | #endif | |
606 | } | |
607 | ||
608 | /* Called once in a parent process. */ | |
609 | void | |
610 | get_original_tty_job_signals () | |
611 | { | |
612 | static int fetched = 0; | |
613 | ||
614 | if (fetched == 0) | |
615 | { | |
616 | #if defined (SIGTSTP) | |
690150f9 CR |
617 | if (interactive_shell) |
618 | { | |
619 | set_original_signal (SIGTSTP, SIG_DFL); | |
620 | set_original_signal (SIGTTIN, SIG_DFL); | |
621 | set_original_signal (SIGTTOU, SIG_DFL); | |
622 | } | |
623 | else | |
624 | { | |
625 | get_original_signal (SIGTSTP); | |
626 | get_original_signal (SIGTTIN); | |
627 | get_original_signal (SIGTTOU); | |
628 | } | |
ccc6cda3 | 629 | #endif |
b4a00022 CR |
630 | fetched = 1; |
631 | } | |
ccc6cda3 JA |
632 | } |
633 | ||
bb70624e JA |
634 | /* Wait for a single pid (PID) and return its exit status. Called by |
635 | the wait builtin. */ | |
f73dda09 | 636 | int |
726f6388 JA |
637 | wait_for_single_pid (pid) |
638 | pid_t pid; | |
639 | { | |
640 | pid_t got_pid; | |
641 | WAIT status; | |
d3a24ed2 | 642 | int pstatus, flags; |
726f6388 JA |
643 | |
644 | pstatus = find_status_by_pid (pid); | |
645 | ||
646 | if (pstatus == PROC_BAD) | |
ccc6cda3 | 647 | { |
5e13499c | 648 | internal_error (_("wait: pid %ld is not a child of this shell"), (long)pid); |
ccc6cda3 JA |
649 | return (127); |
650 | } | |
726f6388 JA |
651 | |
652 | if (pstatus != PROC_STILL_ALIVE) | |
d3a24ed2 CR |
653 | { |
654 | if (pstatus > 128) | |
655 | last_command_exit_signal = find_termsig_by_pid (pid); | |
656 | return (pstatus); | |
657 | } | |
726f6388 JA |
658 | |
659 | siginterrupt (SIGINT, 1); | |
660 | while ((got_pid = WAITPID (pid, &status, 0)) != pid) | |
661 | { | |
ac18b312 | 662 | CHECK_TERMSIG; |
dfc91666 | 663 | CHECK_WAIT_INTR; |
726f6388 JA |
664 | if (got_pid < 0) |
665 | { | |
666 | if (errno != EINTR && errno != ECHILD) | |
667 | { | |
668 | siginterrupt (SIGINT, 0); | |
ccc6cda3 | 669 | sys_error ("wait"); |
726f6388 JA |
670 | } |
671 | break; | |
672 | } | |
673 | else if (got_pid > 0) | |
28ef6c31 | 674 | set_pid_status (got_pid, status); |
726f6388 JA |
675 | } |
676 | ||
7117c2d2 JA |
677 | if (got_pid > 0) |
678 | { | |
679 | set_pid_status (got_pid, status); | |
680 | set_pid_flags (got_pid, PROC_NOTIFIED); | |
681 | } | |
bb70624e | 682 | |
726f6388 JA |
683 | siginterrupt (SIGINT, 0); |
684 | QUIT; | |
685 | ||
7117c2d2 | 686 | return (got_pid > 0 ? process_exit_status (status) : -1); |
726f6388 JA |
687 | } |
688 | ||
bb70624e JA |
689 | /* Wait for all of the shell's children to exit. Called by the `wait' |
690 | builtin. */ | |
726f6388 JA |
691 | void |
692 | wait_for_background_pids () | |
693 | { | |
694 | pid_t got_pid; | |
695 | WAIT status; | |
696 | ||
697 | /* If we aren't using job control, we let the kernel take care of the | |
ccc6cda3 | 698 | bookkeeping for us. wait () will return -1 and set errno to ECHILD |
726f6388 JA |
699 | when there are no more unwaited-for child processes on both |
700 | 4.2 BSD-based and System V-based systems. */ | |
701 | ||
702 | siginterrupt (SIGINT, 1); | |
703 | ||
704 | /* Wait for ECHILD */ | |
705 | while ((got_pid = WAITPID (-1, &status, 0)) != -1) | |
706 | set_pid_status (got_pid, status); | |
707 | ||
708 | if (errno != EINTR && errno != ECHILD) | |
709 | { | |
710 | siginterrupt (SIGINT, 0); | |
ccc6cda3 | 711 | sys_error("wait"); |
726f6388 JA |
712 | } |
713 | ||
714 | siginterrupt (SIGINT, 0); | |
715 | QUIT; | |
bb70624e JA |
716 | |
717 | mark_dead_jobs_as_notified (1); | |
718 | cleanup_dead_jobs (); | |
719 | } | |
720 | ||
96f66efe CR |
721 | void |
722 | wait_sigint_cleanup () | |
723 | { | |
724 | } | |
725 | ||
bb70624e JA |
726 | /* Make OLD_SIGINT_HANDLER the SIGINT signal handler. */ |
727 | #define INVALID_SIGNAL_HANDLER (SigHandler *)wait_for_background_pids | |
728 | static SigHandler *old_sigint_handler = INVALID_SIGNAL_HANDLER; | |
729 | ||
730 | static void | |
731 | restore_sigint_handler () | |
732 | { | |
733 | if (old_sigint_handler != INVALID_SIGNAL_HANDLER) | |
734 | { | |
735 | set_signal_handler (SIGINT, old_sigint_handler); | |
736 | old_sigint_handler = INVALID_SIGNAL_HANDLER; | |
737 | } | |
726f6388 JA |
738 | } |
739 | ||
740 | /* Handle SIGINT while we are waiting for children in a script to exit. | |
741 | All interrupts are effectively ignored by the shell, but allowed to | |
742 | kill a running job. */ | |
743 | static sighandler | |
744 | wait_sigint_handler (sig) | |
745 | int sig; | |
746 | { | |
bb70624e JA |
747 | SigHandler *sigint_handler; |
748 | ||
749 | /* If we got a SIGINT while in `wait', and SIGINT is trapped, do | |
750 | what POSIX.2 says (see builtins/wait.def for more info). */ | |
751 | if (this_shell_builtin && this_shell_builtin == wait_builtin && | |
752 | signal_is_trapped (SIGINT) && | |
753 | ((sigint_handler = trap_to_sighandler (SIGINT)) == trap_handler)) | |
754 | { | |
dfc91666 | 755 | last_command_exit_value = 128+SIGINT; |
bb70624e JA |
756 | restore_sigint_handler (); |
757 | interrupt_immediately = 0; | |
758 | trap_handler (SIGINT); /* set pending_traps[SIGINT] */ | |
7117c2d2 | 759 | wait_signal_received = SIGINT; |
dfc91666 | 760 | SIGRETURN (0); |
bb70624e JA |
761 | } |
762 | ||
28ef6c31 JA |
763 | if (interrupt_immediately) |
764 | { | |
765 | last_command_exit_value = EXECUTION_FAILURE; | |
766 | restore_sigint_handler (); | |
767 | ADDINTERRUPT; | |
768 | QUIT; | |
769 | } | |
726f6388 | 770 | |
bb70624e JA |
771 | wait_sigint_received = 1; |
772 | ||
ccc6cda3 | 773 | SIGRETURN (0); |
726f6388 JA |
774 | } |
775 | ||
d3a24ed2 CR |
776 | static char * |
777 | j_strsignal (s) | |
778 | int s; | |
779 | { | |
780 | static char retcode_name_buffer[64] = { '\0' }; | |
781 | char *x; | |
782 | ||
783 | x = strsignal (s); | |
784 | if (x == 0) | |
785 | { | |
786 | x = retcode_name_buffer; | |
787 | sprintf (x, "Signal %d", s); | |
788 | } | |
789 | return x; | |
790 | } | |
791 | ||
726f6388 JA |
792 | /* Wait for pid (one of our children) to terminate. This is called only |
793 | by the execution code in execute_cmd.c. */ | |
794 | int | |
795 | wait_for (pid) | |
796 | pid_t pid; | |
797 | { | |
798 | int return_val, pstatus; | |
799 | pid_t got_pid; | |
800 | WAIT status; | |
726f6388 JA |
801 | |
802 | pstatus = find_status_by_pid (pid); | |
803 | ||
804 | if (pstatus == PROC_BAD) | |
805 | return (0); | |
806 | ||
807 | if (pstatus != PROC_STILL_ALIVE) | |
d3a24ed2 CR |
808 | { |
809 | if (pstatus > 128) | |
810 | last_command_exit_signal = find_termsig_by_pid (pid); | |
811 | return (pstatus); | |
812 | } | |
726f6388 JA |
813 | |
814 | /* If we are running a script, ignore SIGINT while we're waiting for | |
815 | a child to exit. The loop below does some of this, but not all. */ | |
bb70624e JA |
816 | wait_sigint_received = 0; |
817 | if (interactive_shell == 0) | |
726f6388 JA |
818 | old_sigint_handler = set_signal_handler (SIGINT, wait_sigint_handler); |
819 | ||
820 | while ((got_pid = WAITPID (-1, &status, 0)) != pid) /* XXX was pid now -1 */ | |
821 | { | |
ac18b312 | 822 | CHECK_TERMSIG; |
dfc91666 | 823 | CHECK_WAIT_INTR; |
726f6388 JA |
824 | if (got_pid < 0 && errno == ECHILD) |
825 | { | |
826 | #if !defined (_POSIX_VERSION) | |
827 | status.w_termsig = status.w_retcode = 0; | |
828 | #else | |
829 | status = 0; | |
830 | #endif /* _POSIX_VERSION */ | |
831 | break; | |
832 | } | |
833 | else if (got_pid < 0 && errno != EINTR) | |
f73dda09 | 834 | programming_error ("wait_for(%ld): %s", (long)pid, strerror(errno)); |
726f6388 JA |
835 | else if (got_pid > 0) |
836 | set_pid_status (got_pid, status); | |
837 | } | |
838 | ||
7117c2d2 JA |
839 | if (got_pid > 0) |
840 | set_pid_status (got_pid, status); | |
726f6388 | 841 | |
ccc6cda3 | 842 | #if defined (HAVE_WAITPID) |
726f6388 JA |
843 | if (got_pid >= 0) |
844 | reap_zombie_children (); | |
ccc6cda3 | 845 | #endif /* HAVE_WAITPID */ |
726f6388 | 846 | |
dfc91666 CR |
847 | CHECK_TERMSIG; |
848 | CHECK_WAIT_INTR; | |
849 | ||
ccc6cda3 | 850 | if (interactive_shell == 0) |
726f6388 | 851 | { |
bb70624e JA |
852 | SigHandler *temp_handler; |
853 | ||
854 | temp_handler = old_sigint_handler; | |
855 | restore_sigint_handler (); | |
856 | ||
726f6388 JA |
857 | /* If the job exited because of SIGINT, make sure the shell acts as if |
858 | it had received one also. */ | |
859 | if (WIFSIGNALED (status) && (WTERMSIG (status) == SIGINT)) | |
860 | { | |
bb70624e | 861 | |
726f6388 | 862 | if (maybe_call_trap_handler (SIGINT) == 0) |
bb70624e JA |
863 | { |
864 | if (temp_handler == SIG_DFL) | |
ac18b312 | 865 | termsig_handler (SIGINT); |
bb70624e JA |
866 | else if (temp_handler != INVALID_SIGNAL_HANDLER && temp_handler != SIG_IGN) |
867 | (*temp_handler) (SIGINT); | |
868 | } | |
726f6388 JA |
869 | } |
870 | } | |
ccc6cda3 | 871 | |
726f6388 JA |
872 | /* Default return value. */ |
873 | /* ``a full 8 bits of status is returned'' */ | |
bb70624e | 874 | return_val = process_exit_status (status); |
d3a24ed2 | 875 | last_command_exit_signal = get_termsig (status); |
ccc6cda3 | 876 | |
276cb932 CR |
877 | #if defined (DONT_REPORT_SIGPIPE) && defined (DONT_REPORT_SIGTERM) |
878 | # define REPORTSIG(x) ((x) != SIGINT && (x) != SIGPIPE && (x) != SIGTERM) | |
879 | #elif !defined (DONT_REPORT_SIGPIPE) && !defined (DONT_REPORT_SIGTERM) | |
880 | # define REPORTSIG(x) ((x) != SIGINT) | |
881 | #elif defined (DONT_REPORT_SIGPIPE) | |
882 | # define REPORTSIG(x) ((x) != SIGINT && (x) != SIGPIPE) | |
d166f048 | 883 | #else |
276cb932 | 884 | # define REPORTSIG(x) ((x) != SIGINT && (x) != SIGTERM) |
c31d56a7 | 885 | #endif |
276cb932 CR |
886 | |
887 | if ((WIFSTOPPED (status) == 0) && WIFSIGNALED (status) && REPORTSIG(WTERMSIG (status))) | |
726f6388 | 888 | { |
d3a24ed2 | 889 | fprintf (stderr, "%s", j_strsignal (WTERMSIG (status))); |
726f6388 | 890 | if (WIFCORED (status)) |
d3ad40de | 891 | fprintf (stderr, _(" (core dumped)")); |
726f6388 JA |
892 | fprintf (stderr, "\n"); |
893 | } | |
894 | ||
ccc6cda3 | 895 | if (interactive_shell && subshell_environment == 0) |
726f6388 JA |
896 | { |
897 | if (WIFSIGNALED (status) || WIFSTOPPED (status)) | |
898 | set_tty_state (); | |
899 | else | |
900 | get_tty_state (); | |
901 | } | |
51f7ea36 CR |
902 | else if (interactive_shell == 0 && subshell_environment == 0 && check_window_size) |
903 | get_new_window_size (0, (int *)0, (int *)0); | |
726f6388 JA |
904 | |
905 | return (return_val); | |
906 | } | |
907 | ||
ff247e74 CR |
908 | /* Send PID SIGNAL. Returns -1 on failure, 0 on success. If GROUP is non-zero, |
909 | or PID is less than -1, then kill the process group associated with PID. */ | |
726f6388 JA |
910 | int |
911 | kill_pid (pid, signal, group) | |
912 | pid_t pid; | |
913 | int signal, group; | |
914 | { | |
915 | int result; | |
916 | ||
ff247e74 CR |
917 | if (pid < -1) |
918 | { | |
919 | pid = -pid; | |
920 | group = 1; | |
921 | } | |
bb70624e | 922 | result = group ? killpg (pid, signal) : kill (pid, signal); |
726f6388 JA |
923 | return (result); |
924 | } | |
925 | ||
bb70624e | 926 | static TTYSTRUCT shell_tty_info; |
ccc6cda3 | 927 | static int got_tty_state; |
726f6388 JA |
928 | |
929 | /* Fill the contents of shell_tty_info with the current tty info. */ | |
930 | get_tty_state () | |
931 | { | |
ccc6cda3 JA |
932 | int tty; |
933 | ||
d166f048 | 934 | tty = input_tty (); |
726f6388 JA |
935 | if (tty != -1) |
936 | { | |
bb70624e | 937 | ttgetattr (tty, &shell_tty_info); |
726f6388 | 938 | got_tty_state = 1; |
ccc6cda3 | 939 | if (check_window_size) |
ac58e8c8 | 940 | get_new_window_size (0, (int *)0, (int *)0); |
726f6388 JA |
941 | } |
942 | } | |
943 | ||
944 | /* Make the current tty use the state in shell_tty_info. */ | |
b72432fd | 945 | int |
726f6388 JA |
946 | set_tty_state () |
947 | { | |
ccc6cda3 JA |
948 | int tty; |
949 | ||
d166f048 | 950 | tty = input_tty (); |
726f6388 JA |
951 | if (tty != -1) |
952 | { | |
ccc6cda3 | 953 | if (got_tty_state == 0) |
b72432fd | 954 | return 0; |
bb70624e | 955 | ttsetattr (tty, &shell_tty_info); |
726f6388 | 956 | } |
b72432fd | 957 | return 0; |
726f6388 JA |
958 | } |
959 | ||
960 | /* Give the terminal to PGRP. */ | |
28ef6c31 | 961 | give_terminal_to (pgrp, force) |
726f6388 | 962 | pid_t pgrp; |
28ef6c31 | 963 | int force; |
726f6388 JA |
964 | { |
965 | } | |
966 | ||
967 | /* Stop a pipeline. */ | |
f73dda09 | 968 | int |
726f6388 JA |
969 | stop_pipeline (async, ignore) |
970 | int async; | |
971 | COMMAND *ignore; | |
972 | { | |
973 | already_making_children = 0; | |
f73dda09 | 974 | return 0; |
726f6388 JA |
975 | } |
976 | ||
977 | void | |
978 | start_pipeline () | |
979 | { | |
980 | already_making_children = 1; | |
981 | } | |
982 | ||
f73dda09 JA |
983 | void |
984 | stop_making_children () | |
985 | { | |
986 | already_making_children = 0; | |
987 | } | |
988 | ||
d166f048 JA |
989 | int |
990 | get_job_by_pid (pid, block) | |
991 | pid_t pid; | |
992 | int block; | |
993 | { | |
994 | int i; | |
995 | ||
996 | i = find_index_by_pid (pid); | |
997 | return ((i == NO_PID) ? PROC_BAD : i); | |
998 | } | |
999 | ||
726f6388 JA |
1000 | /* Print descriptive information about the job with leader pid PID. */ |
1001 | void | |
1002 | describe_pid (pid) | |
1003 | pid_t pid; | |
1004 | { | |
f73dda09 | 1005 | fprintf (stderr, "%ld\n", (long) pid); |
726f6388 | 1006 | } |
ccc6cda3 | 1007 | |
30595b57 | 1008 | int |
7d92f73f CR |
1009 | freeze_jobs_list () |
1010 | { | |
1011 | } | |
1012 | ||
ccc6cda3 JA |
1013 | void |
1014 | unfreeze_jobs_list () | |
1015 | { | |
1016 | } | |
bb70624e JA |
1017 | |
1018 | int | |
1019 | count_all_jobs () | |
1020 | { | |
1021 | return 0; | |
1022 | } |