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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 | |
3185942a | 6 | /* Copyright (C) 1987-2009 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" |
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 | ||
b80f6443 | 58 | #if !defined (HAVE_SIGINTERRUPT) && !defined (HAVE_POSIX_SIGNALS) |
726f6388 | 59 | # define siginterrupt(sig, code) |
b80f6443 | 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; | |
b80f6443 | 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; |
7117c2d2 | 84 | extern int wait_signal_received; |
726f6388 JA |
85 | |
86 | pid_t last_made_pid = NO_PID; | |
87 | pid_t last_asynchronous_pid = NO_PID; | |
88 | ||
89 | /* Call this when you start making children. */ | |
90 | int already_making_children = 0; | |
91 | ||
d166f048 JA |
92 | /* The controlling tty for this shell. */ |
93 | int shell_tty = -1; | |
94 | ||
ccc6cda3 JA |
95 | /* If this is non-zero, $LINES and $COLUMNS are reset after every process |
96 | exits from get_tty_state(). */ | |
97 | int check_window_size; | |
98 | ||
bb70624e JA |
99 | /* STATUS and FLAGS are only valid if pid != NO_PID |
100 | STATUS is only valid if (flags & PROC_RUNNING) == 0 */ | |
726f6388 JA |
101 | struct proc_status { |
102 | pid_t pid; | |
103 | int status; /* Exit status of PID or 128 + fatal signal number */ | |
bb70624e | 104 | int flags; |
726f6388 JA |
105 | }; |
106 | ||
bb70624e JA |
107 | /* Values for proc_status.flags */ |
108 | #define PROC_RUNNING 0x01 | |
109 | #define PROC_NOTIFIED 0x02 | |
110 | #define PROC_ASYNC 0x04 | |
b80f6443 | 111 | #define PROC_SIGNALED 0x10 |
bb70624e | 112 | |
bb70624e JA |
113 | /* Return values from find_status_by_pid */ |
114 | #define PROC_BAD -1 | |
726f6388 JA |
115 | #define PROC_STILL_ALIVE -2 |
116 | ||
f73dda09 JA |
117 | static struct proc_status *pid_list = (struct proc_status *)NULL; |
118 | static int pid_list_size; | |
119 | static int wait_sigint_received; | |
120 | ||
7117c2d2 JA |
121 | static long child_max = -1L; |
122 | ||
f73dda09 JA |
123 | static void alloc_pid_list __P((void)); |
124 | static int find_proc_slot __P((void)); | |
125 | static int find_index_by_pid __P((pid_t)); | |
126 | static int find_status_by_pid __P((pid_t)); | |
127 | static int process_exit_status __P((WAIT)); | |
b80f6443 JA |
128 | static int find_termsig_by_pid __P((pid_t)); |
129 | static int get_termsig __P((WAIT)); | |
f73dda09 JA |
130 | static void set_pid_status __P((pid_t, WAIT)); |
131 | static void set_pid_flags __P((pid_t, int)); | |
132 | static void unset_pid_flags __P((pid_t, int)); | |
b80f6443 | 133 | static int get_pid_flags __P((pid_t)); |
f73dda09 JA |
134 | static void add_pid __P((pid_t, int)); |
135 | static void mark_dead_jobs_as_notified __P((int)); | |
136 | ||
7117c2d2 | 137 | static sighandler wait_sigint_handler __P((int)); |
b80f6443 | 138 | static char *j_strsignal __P((int)); |
f73dda09 JA |
139 | |
140 | #if defined (HAVE_WAITPID) | |
141 | static void reap_zombie_children __P((void)); | |
142 | #endif | |
143 | ||
b80f6443 JA |
144 | #if !defined (HAVE_SIGINTERRUPT) && defined (HAVE_POSIX_SIGNALS) |
145 | static int siginterrupt __P((int, int)); | |
146 | #endif | |
147 | ||
f73dda09 JA |
148 | static void restore_sigint_handler __P((void)); |
149 | ||
726f6388 JA |
150 | /* Allocate new, or grow existing PID_LIST. */ |
151 | static void | |
152 | alloc_pid_list () | |
153 | { | |
154 | register int i; | |
155 | int old = pid_list_size; | |
156 | ||
157 | pid_list_size += 10; | |
f73dda09 | 158 | pid_list = (struct proc_status *)xrealloc (pid_list, pid_list_size * sizeof (struct proc_status)); |
726f6388 JA |
159 | |
160 | /* None of the newly allocated slots have process id's yet. */ | |
161 | for (i = old; i < pid_list_size; i++) | |
ccc6cda3 | 162 | pid_list[i].pid = NO_PID; |
726f6388 JA |
163 | } |
164 | ||
165 | /* Return the offset within the PID_LIST array of an empty slot. This can | |
166 | create new slots if all of the existing slots are taken. */ | |
167 | static int | |
168 | find_proc_slot () | |
169 | { | |
170 | register int i; | |
171 | ||
172 | for (i = 0; i < pid_list_size; i++) | |
173 | if (pid_list[i].pid == NO_PID) | |
174 | return (i); | |
175 | ||
176 | if (i == pid_list_size) | |
177 | alloc_pid_list (); | |
178 | ||
179 | return (i); | |
180 | } | |
181 | ||
182 | /* Return the offset within the PID_LIST array of a slot containing PID, | |
183 | or the value NO_PID if the pid wasn't found. */ | |
184 | static int | |
185 | find_index_by_pid (pid) | |
186 | pid_t pid; | |
187 | { | |
188 | register int i; | |
189 | ||
190 | for (i = 0; i < pid_list_size; i++) | |
191 | if (pid_list[i].pid == pid) | |
192 | return (i); | |
193 | ||
194 | return (NO_PID); | |
195 | } | |
196 | ||
197 | /* Return the status of PID as looked up in the PID_LIST array. A | |
198 | return value of PROC_BAD indicates that PID wasn't found. */ | |
199 | static int | |
200 | find_status_by_pid (pid) | |
201 | pid_t pid; | |
202 | { | |
203 | int i; | |
204 | ||
205 | i = find_index_by_pid (pid); | |
206 | if (i == NO_PID) | |
207 | return (PROC_BAD); | |
bb70624e JA |
208 | if (pid_list[i].flags & PROC_RUNNING) |
209 | return (PROC_STILL_ALIVE); | |
726f6388 JA |
210 | return (pid_list[i].status); |
211 | } | |
212 | ||
bb70624e JA |
213 | static int |
214 | process_exit_status (status) | |
215 | WAIT status; | |
216 | { | |
217 | if (WIFSIGNALED (status)) | |
218 | return (128 + WTERMSIG (status)); | |
219 | else | |
220 | return (WEXITSTATUS (status)); | |
221 | } | |
222 | ||
b80f6443 JA |
223 | /* Return the status of PID as looked up in the PID_LIST array. A |
224 | return value of PROC_BAD indicates that PID wasn't found. */ | |
225 | static int | |
226 | find_termsig_by_pid (pid) | |
227 | pid_t pid; | |
228 | { | |
229 | int i; | |
230 | ||
231 | i = find_index_by_pid (pid); | |
232 | if (i == NO_PID) | |
233 | return (0); | |
234 | if (pid_list[i].flags & PROC_RUNNING) | |
235 | return (0); | |
3185942a | 236 | return (get_termsig ((WAIT)pid_list[i].status)); |
b80f6443 JA |
237 | } |
238 | ||
239 | /* Set LAST_COMMAND_EXIT_SIGNAL depending on STATUS. If STATUS is -1, look | |
240 | up PID in the pid array and set LAST_COMMAND_EXIT_SIGNAL appropriately | |
241 | depending on its flags and exit status. */ | |
242 | static int | |
243 | get_termsig (status) | |
244 | WAIT status; | |
245 | { | |
246 | if (WIFSTOPPED (status) == 0 && WIFSIGNALED (status)) | |
247 | return (WTERMSIG (status)); | |
248 | else | |
249 | return (0); | |
250 | } | |
251 | ||
726f6388 JA |
252 | /* Give PID the status value STATUS in the PID_LIST array. */ |
253 | static void | |
254 | set_pid_status (pid, status) | |
255 | pid_t pid; | |
256 | WAIT status; | |
257 | { | |
258 | int slot; | |
259 | ||
17345e5a JA |
260 | #if defined (COPROCESS_SUPPORT) |
261 | coproc_pidchk (pid, status); | |
262 | #endif | |
263 | ||
726f6388 JA |
264 | slot = find_index_by_pid (pid); |
265 | if (slot == NO_PID) | |
266 | return; | |
267 | ||
bb70624e JA |
268 | pid_list[slot].status = process_exit_status (status); |
269 | pid_list[slot].flags &= ~PROC_RUNNING; | |
b80f6443 JA |
270 | if (WIFSIGNALED (status)) |
271 | pid_list[slot].flags |= PROC_SIGNALED; | |
bb70624e JA |
272 | /* If it's not a background process, mark it as notified so it gets |
273 | cleaned up. */ | |
274 | if ((pid_list[slot].flags & PROC_ASYNC) == 0) | |
275 | pid_list[slot].flags |= PROC_NOTIFIED; | |
276 | } | |
277 | ||
278 | /* Give PID the flags FLAGS in the PID_LIST array. */ | |
279 | static void | |
280 | set_pid_flags (pid, flags) | |
281 | pid_t pid; | |
282 | int flags; | |
283 | { | |
284 | int slot; | |
285 | ||
286 | slot = find_index_by_pid (pid); | |
287 | if (slot == NO_PID) | |
288 | return; | |
289 | ||
290 | pid_list[slot].flags |= flags; | |
291 | } | |
292 | ||
293 | /* Unset FLAGS for PID in the pid list */ | |
294 | static void | |
295 | unset_pid_flags (pid, flags) | |
296 | pid_t pid; | |
297 | int flags; | |
298 | { | |
299 | int slot; | |
300 | ||
301 | slot = find_index_by_pid (pid); | |
302 | if (slot == NO_PID) | |
303 | return; | |
304 | ||
305 | pid_list[slot].flags &= ~flags; | |
726f6388 JA |
306 | } |
307 | ||
b80f6443 JA |
308 | /* Return the flags corresponding to PID in the PID_LIST array. */ |
309 | static int | |
310 | get_pid_flags (pid) | |
311 | pid_t pid; | |
312 | { | |
313 | int slot; | |
314 | ||
315 | slot = find_index_by_pid (pid); | |
316 | if (slot == NO_PID) | |
317 | return 0; | |
318 | ||
319 | return (pid_list[slot].flags); | |
320 | } | |
321 | ||
726f6388 | 322 | static void |
bb70624e | 323 | add_pid (pid, async) |
726f6388 | 324 | pid_t pid; |
bb70624e | 325 | int async; |
726f6388 JA |
326 | { |
327 | int slot; | |
328 | ||
329 | slot = find_proc_slot (); | |
bb70624e | 330 | |
726f6388 | 331 | pid_list[slot].pid = pid; |
bb70624e JA |
332 | pid_list[slot].status = -1; |
333 | pid_list[slot].flags = PROC_RUNNING; | |
334 | if (async) | |
335 | pid_list[slot].flags |= PROC_ASYNC; | |
336 | } | |
337 | ||
338 | static void | |
339 | mark_dead_jobs_as_notified (force) | |
340 | int force; | |
341 | { | |
342 | register int i, ndead; | |
343 | ||
344 | /* first, count the number of non-running async jobs if FORCE == 0 */ | |
345 | for (i = ndead = 0; force == 0 && i < pid_list_size; i++) | |
346 | { | |
347 | if (pid_list[i].pid == NO_PID) | |
348 | continue; | |
349 | if (((pid_list[i].flags & PROC_RUNNING) == 0) && | |
350 | (pid_list[i].flags & PROC_ASYNC)) | |
28ef6c31 | 351 | ndead++; |
bb70624e JA |
352 | } |
353 | ||
7117c2d2 JA |
354 | if (child_max < 0) |
355 | child_max = getmaxchild (); | |
356 | if (child_max < 0) | |
357 | child_max = DEFAULT_CHILD_MAX; | |
358 | ||
359 | if (force == 0 && ndead <= child_max) | |
bb70624e JA |
360 | return; |
361 | ||
362 | /* If FORCE == 0, we just mark as many non-running async jobs as notified | |
363 | to bring us under the CHILD_MAX limit. */ | |
364 | for (i = 0; i < pid_list_size; i++) | |
365 | { | |
366 | if (pid_list[i].pid == NO_PID) | |
367 | continue; | |
368 | if (((pid_list[i].flags & PROC_RUNNING) == 0) && | |
369 | pid_list[i].pid != last_asynchronous_pid) | |
370 | { | |
371 | pid_list[i].flags |= PROC_NOTIFIED; | |
7117c2d2 | 372 | if (force == 0 && (pid_list[i].flags & PROC_ASYNC) && --ndead <= child_max) |
bb70624e JA |
373 | break; |
374 | } | |
375 | } | |
726f6388 JA |
376 | } |
377 | ||
bb70624e | 378 | /* Remove all dead, notified jobs from the pid_list. */ |
726f6388 JA |
379 | int |
380 | cleanup_dead_jobs () | |
381 | { | |
382 | register int i; | |
383 | ||
ccc6cda3 | 384 | #if defined (HAVE_WAITPID) |
726f6388 JA |
385 | reap_zombie_children (); |
386 | #endif | |
387 | ||
388 | for (i = 0; i < pid_list_size; i++) | |
bb70624e JA |
389 | { |
390 | if ((pid_list[i].flags & PROC_RUNNING) == 0 && | |
391 | (pid_list[i].flags & PROC_NOTIFIED)) | |
392 | pid_list[i].pid = NO_PID; | |
393 | } | |
394 | ||
17345e5a JA |
395 | #if defined (COPROCESS_SUPPORT) |
396 | coproc_reap (); | |
397 | #endif | |
398 | ||
bb70624e JA |
399 | return 0; |
400 | } | |
401 | ||
402 | void | |
403 | reap_dead_jobs () | |
404 | { | |
405 | mark_dead_jobs_as_notified (0); | |
406 | cleanup_dead_jobs (); | |
726f6388 JA |
407 | } |
408 | ||
409 | /* Initialize the job control mechanism, and set up the tty stuff. */ | |
d166f048 JA |
410 | initialize_job_control (force) |
411 | int force; | |
726f6388 | 412 | { |
d166f048 JA |
413 | shell_tty = fileno (stderr); |
414 | ||
415 | if (interactive) | |
416 | get_tty_state (); | |
726f6388 JA |
417 | } |
418 | ||
726f6388 JA |
419 | /* Setup this shell to handle C-C, etc. */ |
420 | void | |
421 | initialize_job_signals () | |
422 | { | |
423 | set_signal_handler (SIGINT, sigint_sighandler); | |
726f6388 JA |
424 | |
425 | /* If this is a login shell we don't wish to be disturbed by | |
426 | stop signals. */ | |
427 | if (login_shell) | |
ccc6cda3 | 428 | ignore_tty_job_signals (); |
726f6388 JA |
429 | } |
430 | ||
ccc6cda3 | 431 | #if defined (HAVE_WAITPID) |
726f6388 JA |
432 | /* Collect the status of all zombie children so that their system |
433 | resources can be deallocated. */ | |
434 | static void | |
435 | reap_zombie_children () | |
436 | { | |
b80f6443 | 437 | # if defined (WNOHANG) |
726f6388 JA |
438 | pid_t pid; |
439 | WAIT status; | |
440 | ||
0628567a | 441 | CHECK_TERMSIG; |
726f6388 JA |
442 | while ((pid = waitpid (-1, (int *)&status, WNOHANG)) > 0) |
443 | set_pid_status (pid, status); | |
b80f6443 | 444 | # endif /* WNOHANG */ |
0628567a | 445 | CHECK_TERMSIG; |
726f6388 | 446 | } |
b80f6443 JA |
447 | #endif /* WAITPID */ |
448 | ||
449 | #if !defined (HAVE_SIGINTERRUPT) && defined (HAVE_POSIX_SIGNALS) | |
450 | static int | |
451 | siginterrupt (sig, flag) | |
452 | int sig, flag; | |
453 | { | |
454 | struct sigaction act; | |
455 | ||
456 | sigaction (sig, (struct sigaction *)NULL, &act); | |
457 | ||
458 | if (flag) | |
459 | act.sa_flags &= ~SA_RESTART; | |
460 | else | |
461 | act.sa_flags |= SA_RESTART; | |
462 | ||
463 | return (sigaction (sig, &act, (struct sigaction *)NULL)); | |
464 | } | |
465 | #endif /* !HAVE_SIGINTERRUPT && HAVE_POSIX_SIGNALS */ | |
726f6388 JA |
466 | |
467 | /* Fork, handling errors. Returns the pid of the newly made child, or 0. | |
468 | COMMAND is just for remembering the name of the command; we don't do | |
469 | anything else with it. ASYNC_P says what to do with the tty. If | |
470 | non-zero, then don't give it away. */ | |
471 | pid_t | |
472 | make_child (command, async_p) | |
473 | char *command; | |
474 | int async_p; | |
475 | { | |
476 | pid_t pid; | |
3185942a | 477 | int forksleep; |
726f6388 JA |
478 | |
479 | /* Discard saved memory. */ | |
ccc6cda3 | 480 | if (command) |
726f6388 JA |
481 | free (command); |
482 | ||
483 | start_pipeline (); | |
484 | ||
485 | #if defined (BUFFERED_INPUT) | |
486 | /* If default_buffered_input is active, we are reading a script. If | |
487 | the command is asynchronous, we have already duplicated /dev/null | |
488 | as fd 0, but have not changed the buffered stream corresponding to | |
489 | the old fd 0. We don't want to sync the stream in this case. */ | |
cce855bc | 490 | if (default_buffered_input != -1 && (!async_p || default_buffered_input > 0)) |
726f6388 JA |
491 | sync_buffered_stream (default_buffered_input); |
492 | #endif /* BUFFERED_INPUT */ | |
493 | ||
3185942a JA |
494 | /* Create the child, handle severe errors. Retry on EAGAIN. */ |
495 | forksleep = 1; | |
496 | while ((pid = fork ()) < 0 && errno == EAGAIN && forksleep < FORKSLEEP_MAX) | |
726f6388 | 497 | { |
3185942a | 498 | sys_error ("fork: retry"); |
ccc6cda3 | 499 | #if defined (HAVE_WAITPID) |
726f6388 JA |
500 | /* Posix systems with a non-blocking waitpid () system call available |
501 | get another chance after zombies are reaped. */ | |
3185942a JA |
502 | reap_zombie_children (); |
503 | if (forksleep > 1 && sleep (forksleep) != 0) | |
504 | break; | |
505 | #else | |
506 | if (sleep (forksleep) != 0) | |
507 | break; | |
ccc6cda3 | 508 | #endif /* HAVE_WAITPID */ |
3185942a JA |
509 | forksleep <<= 1; |
510 | } | |
726f6388 | 511 | |
3185942a JA |
512 | if (pid < 0) |
513 | { | |
ccc6cda3 | 514 | sys_error ("fork"); |
726f6388 JA |
515 | throw_to_top_level (); |
516 | } | |
ccc6cda3 | 517 | |
726f6388 JA |
518 | if (pid == 0) |
519 | { | |
520 | #if defined (BUFFERED_INPUT) | |
cce855bc | 521 | unset_bash_input (0); |
726f6388 JA |
522 | #endif /* BUFFERED_INPUT */ |
523 | ||
ccc6cda3 | 524 | #if defined (HAVE_POSIX_SIGNALS) |
726f6388 JA |
525 | /* Restore top-level signal mask. */ |
526 | sigprocmask (SIG_SETMASK, &top_level_mask, (sigset_t *)NULL); | |
527 | #endif | |
528 | ||
3185942a | 529 | #if 0 |
726f6388 JA |
530 | /* Ignore INT and QUIT in asynchronous children. */ |
531 | if (async_p) | |
ccc6cda3 | 532 | last_asynchronous_pid = getpid (); |
3185942a | 533 | #endif |
726f6388 | 534 | |
ccc6cda3 | 535 | default_tty_job_signals (); |
726f6388 JA |
536 | } |
537 | else | |
538 | { | |
539 | /* In the parent. */ | |
540 | ||
541 | last_made_pid = pid; | |
542 | ||
543 | if (async_p) | |
544 | last_asynchronous_pid = pid; | |
545 | ||
bb70624e | 546 | add_pid (pid, async_p); |
726f6388 JA |
547 | } |
548 | return (pid); | |
549 | } | |
550 | ||
ccc6cda3 JA |
551 | void |
552 | ignore_tty_job_signals () | |
553 | { | |
554 | #if defined (SIGTSTP) | |
555 | set_signal_handler (SIGTSTP, SIG_IGN); | |
556 | set_signal_handler (SIGTTIN, SIG_IGN); | |
557 | set_signal_handler (SIGTTOU, SIG_IGN); | |
558 | #endif | |
559 | } | |
560 | ||
561 | void | |
562 | default_tty_job_signals () | |
563 | { | |
564 | #if defined (SIGTSTP) | |
565 | set_signal_handler (SIGTSTP, SIG_DFL); | |
566 | set_signal_handler (SIGTTIN, SIG_DFL); | |
567 | set_signal_handler (SIGTTOU, SIG_DFL); | |
568 | #endif | |
569 | } | |
570 | ||
bb70624e JA |
571 | /* Wait for a single pid (PID) and return its exit status. Called by |
572 | the wait builtin. */ | |
f73dda09 | 573 | int |
726f6388 JA |
574 | wait_for_single_pid (pid) |
575 | pid_t pid; | |
576 | { | |
577 | pid_t got_pid; | |
578 | WAIT status; | |
b80f6443 | 579 | int pstatus, flags; |
726f6388 JA |
580 | |
581 | pstatus = find_status_by_pid (pid); | |
582 | ||
583 | if (pstatus == PROC_BAD) | |
ccc6cda3 | 584 | { |
b80f6443 | 585 | internal_error (_("wait: pid %ld is not a child of this shell"), (long)pid); |
ccc6cda3 JA |
586 | return (127); |
587 | } | |
726f6388 JA |
588 | |
589 | if (pstatus != PROC_STILL_ALIVE) | |
b80f6443 JA |
590 | { |
591 | if (pstatus > 128) | |
592 | last_command_exit_signal = find_termsig_by_pid (pid); | |
593 | return (pstatus); | |
594 | } | |
726f6388 JA |
595 | |
596 | siginterrupt (SIGINT, 1); | |
597 | while ((got_pid = WAITPID (pid, &status, 0)) != pid) | |
598 | { | |
0628567a | 599 | CHECK_TERMSIG; |
726f6388 JA |
600 | if (got_pid < 0) |
601 | { | |
602 | if (errno != EINTR && errno != ECHILD) | |
603 | { | |
604 | siginterrupt (SIGINT, 0); | |
ccc6cda3 | 605 | sys_error ("wait"); |
726f6388 JA |
606 | } |
607 | break; | |
608 | } | |
609 | else if (got_pid > 0) | |
28ef6c31 | 610 | set_pid_status (got_pid, status); |
726f6388 JA |
611 | } |
612 | ||
7117c2d2 JA |
613 | if (got_pid > 0) |
614 | { | |
615 | set_pid_status (got_pid, status); | |
616 | set_pid_flags (got_pid, PROC_NOTIFIED); | |
617 | } | |
bb70624e | 618 | |
726f6388 JA |
619 | siginterrupt (SIGINT, 0); |
620 | QUIT; | |
621 | ||
7117c2d2 | 622 | return (got_pid > 0 ? process_exit_status (status) : -1); |
726f6388 JA |
623 | } |
624 | ||
bb70624e JA |
625 | /* Wait for all of the shell's children to exit. Called by the `wait' |
626 | builtin. */ | |
726f6388 JA |
627 | void |
628 | wait_for_background_pids () | |
629 | { | |
630 | pid_t got_pid; | |
631 | WAIT status; | |
632 | ||
633 | /* If we aren't using job control, we let the kernel take care of the | |
ccc6cda3 | 634 | bookkeeping for us. wait () will return -1 and set errno to ECHILD |
726f6388 JA |
635 | when there are no more unwaited-for child processes on both |
636 | 4.2 BSD-based and System V-based systems. */ | |
637 | ||
638 | siginterrupt (SIGINT, 1); | |
639 | ||
640 | /* Wait for ECHILD */ | |
641 | while ((got_pid = WAITPID (-1, &status, 0)) != -1) | |
642 | set_pid_status (got_pid, status); | |
643 | ||
644 | if (errno != EINTR && errno != ECHILD) | |
645 | { | |
646 | siginterrupt (SIGINT, 0); | |
ccc6cda3 | 647 | sys_error("wait"); |
726f6388 JA |
648 | } |
649 | ||
650 | siginterrupt (SIGINT, 0); | |
651 | QUIT; | |
bb70624e JA |
652 | |
653 | mark_dead_jobs_as_notified (1); | |
654 | cleanup_dead_jobs (); | |
655 | } | |
656 | ||
657 | /* Make OLD_SIGINT_HANDLER the SIGINT signal handler. */ | |
658 | #define INVALID_SIGNAL_HANDLER (SigHandler *)wait_for_background_pids | |
659 | static SigHandler *old_sigint_handler = INVALID_SIGNAL_HANDLER; | |
660 | ||
661 | static void | |
662 | restore_sigint_handler () | |
663 | { | |
664 | if (old_sigint_handler != INVALID_SIGNAL_HANDLER) | |
665 | { | |
666 | set_signal_handler (SIGINT, old_sigint_handler); | |
667 | old_sigint_handler = INVALID_SIGNAL_HANDLER; | |
668 | } | |
726f6388 JA |
669 | } |
670 | ||
671 | /* Handle SIGINT while we are waiting for children in a script to exit. | |
672 | All interrupts are effectively ignored by the shell, but allowed to | |
673 | kill a running job. */ | |
674 | static sighandler | |
675 | wait_sigint_handler (sig) | |
676 | int sig; | |
677 | { | |
bb70624e JA |
678 | SigHandler *sigint_handler; |
679 | ||
680 | /* If we got a SIGINT while in `wait', and SIGINT is trapped, do | |
681 | what POSIX.2 says (see builtins/wait.def for more info). */ | |
682 | if (this_shell_builtin && this_shell_builtin == wait_builtin && | |
683 | signal_is_trapped (SIGINT) && | |
684 | ((sigint_handler = trap_to_sighandler (SIGINT)) == trap_handler)) | |
685 | { | |
686 | last_command_exit_value = EXECUTION_FAILURE; | |
687 | restore_sigint_handler (); | |
688 | interrupt_immediately = 0; | |
689 | trap_handler (SIGINT); /* set pending_traps[SIGINT] */ | |
7117c2d2 | 690 | wait_signal_received = SIGINT; |
bb70624e JA |
691 | longjmp (wait_intr_buf, 1); |
692 | } | |
693 | ||
28ef6c31 JA |
694 | if (interrupt_immediately) |
695 | { | |
696 | last_command_exit_value = EXECUTION_FAILURE; | |
697 | restore_sigint_handler (); | |
698 | ADDINTERRUPT; | |
699 | QUIT; | |
700 | } | |
726f6388 | 701 | |
bb70624e JA |
702 | wait_sigint_received = 1; |
703 | ||
ccc6cda3 | 704 | SIGRETURN (0); |
726f6388 JA |
705 | } |
706 | ||
b80f6443 JA |
707 | static char * |
708 | j_strsignal (s) | |
709 | int s; | |
710 | { | |
711 | static char retcode_name_buffer[64] = { '\0' }; | |
712 | char *x; | |
713 | ||
714 | x = strsignal (s); | |
715 | if (x == 0) | |
716 | { | |
717 | x = retcode_name_buffer; | |
718 | sprintf (x, "Signal %d", s); | |
719 | } | |
720 | return x; | |
721 | } | |
722 | ||
726f6388 JA |
723 | /* Wait for pid (one of our children) to terminate. This is called only |
724 | by the execution code in execute_cmd.c. */ | |
725 | int | |
726 | wait_for (pid) | |
727 | pid_t pid; | |
728 | { | |
729 | int return_val, pstatus; | |
730 | pid_t got_pid; | |
731 | WAIT status; | |
726f6388 JA |
732 | |
733 | pstatus = find_status_by_pid (pid); | |
734 | ||
735 | if (pstatus == PROC_BAD) | |
736 | return (0); | |
737 | ||
738 | if (pstatus != PROC_STILL_ALIVE) | |
b80f6443 JA |
739 | { |
740 | if (pstatus > 128) | |
741 | last_command_exit_signal = find_termsig_by_pid (pid); | |
742 | return (pstatus); | |
743 | } | |
726f6388 JA |
744 | |
745 | /* If we are running a script, ignore SIGINT while we're waiting for | |
746 | a child to exit. The loop below does some of this, but not all. */ | |
bb70624e JA |
747 | wait_sigint_received = 0; |
748 | if (interactive_shell == 0) | |
726f6388 JA |
749 | old_sigint_handler = set_signal_handler (SIGINT, wait_sigint_handler); |
750 | ||
751 | while ((got_pid = WAITPID (-1, &status, 0)) != pid) /* XXX was pid now -1 */ | |
752 | { | |
0628567a | 753 | CHECK_TERMSIG; |
726f6388 JA |
754 | if (got_pid < 0 && errno == ECHILD) |
755 | { | |
756 | #if !defined (_POSIX_VERSION) | |
757 | status.w_termsig = status.w_retcode = 0; | |
758 | #else | |
759 | status = 0; | |
760 | #endif /* _POSIX_VERSION */ | |
761 | break; | |
762 | } | |
763 | else if (got_pid < 0 && errno != EINTR) | |
f73dda09 | 764 | programming_error ("wait_for(%ld): %s", (long)pid, strerror(errno)); |
726f6388 JA |
765 | else if (got_pid > 0) |
766 | set_pid_status (got_pid, status); | |
767 | } | |
768 | ||
7117c2d2 JA |
769 | if (got_pid > 0) |
770 | set_pid_status (got_pid, status); | |
726f6388 | 771 | |
ccc6cda3 | 772 | #if defined (HAVE_WAITPID) |
726f6388 JA |
773 | if (got_pid >= 0) |
774 | reap_zombie_children (); | |
ccc6cda3 | 775 | #endif /* HAVE_WAITPID */ |
726f6388 | 776 | |
ccc6cda3 | 777 | if (interactive_shell == 0) |
726f6388 | 778 | { |
bb70624e JA |
779 | SigHandler *temp_handler; |
780 | ||
781 | temp_handler = old_sigint_handler; | |
782 | restore_sigint_handler (); | |
783 | ||
726f6388 JA |
784 | /* If the job exited because of SIGINT, make sure the shell acts as if |
785 | it had received one also. */ | |
786 | if (WIFSIGNALED (status) && (WTERMSIG (status) == SIGINT)) | |
787 | { | |
bb70624e | 788 | |
726f6388 | 789 | if (maybe_call_trap_handler (SIGINT) == 0) |
bb70624e JA |
790 | { |
791 | if (temp_handler == SIG_DFL) | |
0628567a | 792 | termsig_handler (SIGINT); |
bb70624e JA |
793 | else if (temp_handler != INVALID_SIGNAL_HANDLER && temp_handler != SIG_IGN) |
794 | (*temp_handler) (SIGINT); | |
795 | } | |
726f6388 JA |
796 | } |
797 | } | |
ccc6cda3 | 798 | |
726f6388 JA |
799 | /* Default return value. */ |
800 | /* ``a full 8 bits of status is returned'' */ | |
bb70624e | 801 | return_val = process_exit_status (status); |
b80f6443 | 802 | last_command_exit_signal = get_termsig (status); |
ccc6cda3 | 803 | |
d166f048 JA |
804 | #if !defined (DONT_REPORT_SIGPIPE) |
805 | if ((WIFSTOPPED (status) == 0) && WIFSIGNALED (status) && | |
806 | (WTERMSIG (status) != SIGINT)) | |
807 | #else | |
808 | if ((WIFSTOPPED (status) == 0) && WIFSIGNALED (status) && | |
809 | (WTERMSIG (status) != SIGINT) && (WTERMSIG (status) != SIGPIPE)) | |
810 | #endif | |
726f6388 | 811 | { |
b80f6443 | 812 | fprintf (stderr, "%s", j_strsignal (WTERMSIG (status))); |
726f6388 | 813 | if (WIFCORED (status)) |
3185942a | 814 | fprintf (stderr, _(" (core dumped)")); |
726f6388 JA |
815 | fprintf (stderr, "\n"); |
816 | } | |
817 | ||
ccc6cda3 | 818 | if (interactive_shell && subshell_environment == 0) |
726f6388 JA |
819 | { |
820 | if (WIFSIGNALED (status) || WIFSTOPPED (status)) | |
821 | set_tty_state (); | |
822 | else | |
823 | get_tty_state (); | |
824 | } | |
825 | ||
826 | return (return_val); | |
827 | } | |
828 | ||
95732b49 JA |
829 | /* Send PID SIGNAL. Returns -1 on failure, 0 on success. If GROUP is non-zero, |
830 | or PID is less than -1, then kill the process group associated with PID. */ | |
726f6388 JA |
831 | int |
832 | kill_pid (pid, signal, group) | |
833 | pid_t pid; | |
834 | int signal, group; | |
835 | { | |
836 | int result; | |
837 | ||
95732b49 JA |
838 | if (pid < -1) |
839 | { | |
840 | pid = -pid; | |
841 | group = 1; | |
842 | } | |
bb70624e | 843 | result = group ? killpg (pid, signal) : kill (pid, signal); |
726f6388 JA |
844 | return (result); |
845 | } | |
846 | ||
bb70624e | 847 | static TTYSTRUCT shell_tty_info; |
ccc6cda3 | 848 | static int got_tty_state; |
726f6388 JA |
849 | |
850 | /* Fill the contents of shell_tty_info with the current tty info. */ | |
851 | get_tty_state () | |
852 | { | |
ccc6cda3 JA |
853 | int tty; |
854 | ||
d166f048 | 855 | tty = input_tty (); |
726f6388 JA |
856 | if (tty != -1) |
857 | { | |
bb70624e | 858 | ttgetattr (tty, &shell_tty_info); |
726f6388 | 859 | got_tty_state = 1; |
ccc6cda3 | 860 | if (check_window_size) |
95732b49 | 861 | get_new_window_size (0, (int *)0, (int *)0); |
726f6388 JA |
862 | } |
863 | } | |
864 | ||
865 | /* Make the current tty use the state in shell_tty_info. */ | |
b72432fd | 866 | int |
726f6388 JA |
867 | set_tty_state () |
868 | { | |
ccc6cda3 JA |
869 | int tty; |
870 | ||
d166f048 | 871 | tty = input_tty (); |
726f6388 JA |
872 | if (tty != -1) |
873 | { | |
ccc6cda3 | 874 | if (got_tty_state == 0) |
b72432fd | 875 | return 0; |
bb70624e | 876 | ttsetattr (tty, &shell_tty_info); |
726f6388 | 877 | } |
b72432fd | 878 | return 0; |
726f6388 JA |
879 | } |
880 | ||
881 | /* Give the terminal to PGRP. */ | |
28ef6c31 | 882 | give_terminal_to (pgrp, force) |
726f6388 | 883 | pid_t pgrp; |
28ef6c31 | 884 | int force; |
726f6388 JA |
885 | { |
886 | } | |
887 | ||
888 | /* Stop a pipeline. */ | |
f73dda09 | 889 | int |
726f6388 JA |
890 | stop_pipeline (async, ignore) |
891 | int async; | |
892 | COMMAND *ignore; | |
893 | { | |
894 | already_making_children = 0; | |
f73dda09 | 895 | return 0; |
726f6388 JA |
896 | } |
897 | ||
898 | void | |
899 | start_pipeline () | |
900 | { | |
901 | already_making_children = 1; | |
902 | } | |
903 | ||
f73dda09 JA |
904 | void |
905 | stop_making_children () | |
906 | { | |
907 | already_making_children = 0; | |
908 | } | |
909 | ||
d166f048 JA |
910 | int |
911 | get_job_by_pid (pid, block) | |
912 | pid_t pid; | |
913 | int block; | |
914 | { | |
915 | int i; | |
916 | ||
917 | i = find_index_by_pid (pid); | |
918 | return ((i == NO_PID) ? PROC_BAD : i); | |
919 | } | |
920 | ||
726f6388 JA |
921 | /* Print descriptive information about the job with leader pid PID. */ |
922 | void | |
923 | describe_pid (pid) | |
924 | pid_t pid; | |
925 | { | |
f73dda09 | 926 | fprintf (stderr, "%ld\n", (long) pid); |
726f6388 | 927 | } |
ccc6cda3 | 928 | |
495aee44 CR |
929 | void |
930 | freeze_jobs_list () | |
931 | { | |
932 | } | |
933 | ||
ccc6cda3 JA |
934 | void |
935 | unfreeze_jobs_list () | |
936 | { | |
937 | } | |
bb70624e JA |
938 | |
939 | int | |
940 | count_all_jobs () | |
941 | { | |
942 | return 0; | |
943 | } |