]>
Commit | Line | Data |
---|---|---|
726f6388 JA |
1 | /* The thing that makes children, remembers them, and contains wait loops. */ |
2 | ||
ccc6cda3 JA |
3 | /* This file works under BSD, System V, minix, and Posix systems. It does |
4 | not implement job control. */ | |
726f6388 JA |
5 | |
6 | /* Copyright (C) 1987, 1989, 1992 Free Software Foundation, Inc. | |
7 | ||
8 | This file is part of GNU Bash, the Bourne Again SHell. | |
9 | ||
10 | Bash is free software; you can redistribute it and/or modify it under | |
11 | the terms of the GNU General Public License as published by the Free | |
bb70624e | 12 | Software Foundation; either version 2, or (at your option) any later |
726f6388 JA |
13 | version. |
14 | ||
15 | Bash is distributed in the hope that it will be useful, but WITHOUT ANY | |
16 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
17 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
18 | for more details. | |
19 | ||
20 | You should have received a copy of the GNU General Public License along | |
21 | with Bash; see the file COPYING. If not, write to the Free Software | |
bb70624e | 22 | Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */ |
726f6388 | 23 | |
ccc6cda3 JA |
24 | #include "config.h" |
25 | ||
726f6388 | 26 | #include "bashtypes.h" |
ccc6cda3 JA |
27 | #include "filecntl.h" |
28 | ||
29 | #if defined (HAVE_UNISTD_H) | |
30 | # include <unistd.h> | |
31 | #endif | |
32 | ||
33 | #include <stdio.h> | |
726f6388 | 34 | #include <signal.h> |
726f6388 JA |
35 | #include <errno.h> |
36 | ||
726f6388 JA |
37 | #if defined (BUFFERED_INPUT) |
38 | # include "input.h" | |
39 | #endif | |
40 | ||
bb70624e JA |
41 | /* Need to include this up here for *_TTY_DRIVER definitions. */ |
42 | #include "shtty.h" | |
ccc6cda3 | 43 | |
d166f048 | 44 | #if !defined (STRUCT_WINSIZE_IN_SYS_IOCTL) |
ccc6cda3 JA |
45 | /* For struct winsize on SCO */ |
46 | /* sys/ptem.h has winsize but needs mblk_t from sys/stream.h */ | |
d166f048 JA |
47 | # if defined (HAVE_SYS_PTEM_H) && defined (TIOCGWINSZ) && defined (SIGWINCH) |
48 | # if defined (HAVE_SYS_STREAM_H) | |
49 | # include <sys/stream.h> | |
50 | # endif | |
51 | # include <sys/ptem.h> | |
52 | # endif /* HAVE_SYS_PTEM_H && TIOCGWINSZ && SIGWINCH */ | |
53 | #endif /* !STRUCT_WINSIZE_IN_SYS_IOCTL */ | |
726f6388 | 54 | |
5e13499c CR |
55 | #include "bashintl.h" |
56 | ||
bb70624e JA |
57 | #include "shell.h" |
58 | #include "jobs.h" | |
59 | ||
60 | #include "builtins/builtext.h" /* for wait_builtin */ | |
61 | ||
7117c2d2 | 62 | #define DEFAULT_CHILD_MAX 32 |
bb70624e | 63 | |
ccc6cda3 | 64 | #if defined (_POSIX_VERSION) || !defined (HAVE_KILLPG) |
726f6388 JA |
65 | # define killpg(pg, sig) kill(-(pg),(sig)) |
66 | #endif /* USG || _POSIX_VERSION */ | |
67 | ||
5e13499c | 68 | #if !defined (HAVE_SIGINTERRUPT) && !defined (HAVE_POSIX_SIGNALS) |
726f6388 | 69 | # define siginterrupt(sig, code) |
5e13499c | 70 | #endif /* !HAVE_SIGINTERRUPT && !HAVE_POSIX_SIGNALS */ |
726f6388 | 71 | |
ccc6cda3 | 72 | #if defined (HAVE_WAITPID) |
726f6388 JA |
73 | # define WAITPID(pid, statusp, options) waitpid (pid, statusp, options) |
74 | #else | |
75 | # define WAITPID(pid, statusp, options) wait (statusp) | |
ccc6cda3 | 76 | #endif /* !HAVE_WAITPID */ |
726f6388 | 77 | |
d166f048 JA |
78 | /* Return the fd from which we are actually getting input. */ |
79 | #define input_tty() (shell_tty != -1) ? shell_tty : fileno (stderr) | |
80 | ||
726f6388 JA |
81 | #if !defined (errno) |
82 | extern int errno; | |
83 | #endif /* !errno */ | |
84 | ||
d166f048 | 85 | #if defined (READLINE) |
28ef6c31 | 86 | extern void rl_set_screen_size __P((int, int)); |
bb70624e | 87 | #endif |
d166f048 | 88 | |
726f6388 JA |
89 | extern int interactive, interactive_shell, login_shell; |
90 | extern int subshell_environment; | |
d3a24ed2 | 91 | extern int last_command_exit_value, last_command_exit_signal; |
bb70624e | 92 | extern int interrupt_immediately; |
f73dda09 | 93 | extern sh_builtin_func_t *this_shell_builtin; |
ccc6cda3 | 94 | #if defined (HAVE_POSIX_SIGNALS) |
726f6388 JA |
95 | extern sigset_t top_level_mask; |
96 | #endif | |
bb70624e | 97 | extern procenv_t wait_intr_buf; |
7117c2d2 | 98 | extern int wait_signal_received; |
726f6388 JA |
99 | |
100 | pid_t last_made_pid = NO_PID; | |
101 | pid_t last_asynchronous_pid = NO_PID; | |
102 | ||
103 | /* Call this when you start making children. */ | |
104 | int already_making_children = 0; | |
105 | ||
d166f048 JA |
106 | /* The controlling tty for this shell. */ |
107 | int shell_tty = -1; | |
108 | ||
ccc6cda3 JA |
109 | /* If this is non-zero, $LINES and $COLUMNS are reset after every process |
110 | exits from get_tty_state(). */ | |
111 | int check_window_size; | |
112 | ||
bb70624e JA |
113 | /* STATUS and FLAGS are only valid if pid != NO_PID |
114 | STATUS is only valid if (flags & PROC_RUNNING) == 0 */ | |
726f6388 JA |
115 | struct proc_status { |
116 | pid_t pid; | |
117 | int status; /* Exit status of PID or 128 + fatal signal number */ | |
bb70624e | 118 | int flags; |
726f6388 JA |
119 | }; |
120 | ||
bb70624e JA |
121 | /* Values for proc_status.flags */ |
122 | #define PROC_RUNNING 0x01 | |
123 | #define PROC_NOTIFIED 0x02 | |
124 | #define PROC_ASYNC 0x04 | |
d3a24ed2 | 125 | #define PROC_SIGNALED 0x10 |
bb70624e | 126 | |
bb70624e JA |
127 | /* Return values from find_status_by_pid */ |
128 | #define PROC_BAD -1 | |
726f6388 JA |
129 | #define PROC_STILL_ALIVE -2 |
130 | ||
f73dda09 JA |
131 | static struct proc_status *pid_list = (struct proc_status *)NULL; |
132 | static int pid_list_size; | |
133 | static int wait_sigint_received; | |
134 | ||
7117c2d2 JA |
135 | static long child_max = -1L; |
136 | ||
f73dda09 JA |
137 | static void alloc_pid_list __P((void)); |
138 | static int find_proc_slot __P((void)); | |
139 | static int find_index_by_pid __P((pid_t)); | |
140 | static int find_status_by_pid __P((pid_t)); | |
141 | static int process_exit_status __P((WAIT)); | |
d3a24ed2 CR |
142 | static int find_termsig_by_pid __P((pid_t)); |
143 | static int get_termsig __P((WAIT)); | |
f73dda09 JA |
144 | static void set_pid_status __P((pid_t, WAIT)); |
145 | static void set_pid_flags __P((pid_t, int)); | |
146 | static void unset_pid_flags __P((pid_t, int)); | |
d3a24ed2 | 147 | static int get_pid_flags __P((pid_t)); |
f73dda09 JA |
148 | static void add_pid __P((pid_t, int)); |
149 | static void mark_dead_jobs_as_notified __P((int)); | |
150 | ||
151 | static void get_new_window_size __P((int)); | |
152 | static sighandler sigwinch_sighandler __P((int)); | |
7117c2d2 | 153 | static sighandler wait_sigint_handler __P((int)); |
d3a24ed2 | 154 | static char *j_strsignal __P((int)); |
f73dda09 JA |
155 | |
156 | #if defined (HAVE_WAITPID) | |
157 | static void reap_zombie_children __P((void)); | |
158 | #endif | |
159 | ||
5e13499c CR |
160 | #if !defined (HAVE_SIGINTERRUPT) && defined (HAVE_POSIX_SIGNALS) |
161 | static int siginterrupt __P((int, int)); | |
162 | #endif | |
163 | ||
f73dda09 JA |
164 | static void restore_sigint_handler __P((void)); |
165 | ||
726f6388 JA |
166 | /* Allocate new, or grow existing PID_LIST. */ |
167 | static void | |
168 | alloc_pid_list () | |
169 | { | |
170 | register int i; | |
171 | int old = pid_list_size; | |
172 | ||
173 | pid_list_size += 10; | |
f73dda09 | 174 | pid_list = (struct proc_status *)xrealloc (pid_list, pid_list_size * sizeof (struct proc_status)); |
726f6388 JA |
175 | |
176 | /* None of the newly allocated slots have process id's yet. */ | |
177 | for (i = old; i < pid_list_size; i++) | |
ccc6cda3 | 178 | pid_list[i].pid = NO_PID; |
726f6388 JA |
179 | } |
180 | ||
181 | /* Return the offset within the PID_LIST array of an empty slot. This can | |
182 | create new slots if all of the existing slots are taken. */ | |
183 | static int | |
184 | find_proc_slot () | |
185 | { | |
186 | register int i; | |
187 | ||
188 | for (i = 0; i < pid_list_size; i++) | |
189 | if (pid_list[i].pid == NO_PID) | |
190 | return (i); | |
191 | ||
192 | if (i == pid_list_size) | |
193 | alloc_pid_list (); | |
194 | ||
195 | return (i); | |
196 | } | |
197 | ||
198 | /* Return the offset within the PID_LIST array of a slot containing PID, | |
199 | or the value NO_PID if the pid wasn't found. */ | |
200 | static int | |
201 | find_index_by_pid (pid) | |
202 | pid_t pid; | |
203 | { | |
204 | register int i; | |
205 | ||
206 | for (i = 0; i < pid_list_size; i++) | |
207 | if (pid_list[i].pid == pid) | |
208 | return (i); | |
209 | ||
210 | return (NO_PID); | |
211 | } | |
212 | ||
213 | /* Return the status of PID as looked up in the PID_LIST array. A | |
214 | return value of PROC_BAD indicates that PID wasn't found. */ | |
215 | static int | |
216 | find_status_by_pid (pid) | |
217 | pid_t pid; | |
218 | { | |
219 | int i; | |
220 | ||
221 | i = find_index_by_pid (pid); | |
222 | if (i == NO_PID) | |
223 | return (PROC_BAD); | |
bb70624e JA |
224 | if (pid_list[i].flags & PROC_RUNNING) |
225 | return (PROC_STILL_ALIVE); | |
726f6388 JA |
226 | return (pid_list[i].status); |
227 | } | |
228 | ||
bb70624e JA |
229 | static int |
230 | process_exit_status (status) | |
231 | WAIT status; | |
232 | { | |
233 | if (WIFSIGNALED (status)) | |
234 | return (128 + WTERMSIG (status)); | |
235 | else | |
236 | return (WEXITSTATUS (status)); | |
237 | } | |
238 | ||
d3a24ed2 CR |
239 | /* Return the status of PID as looked up in the PID_LIST array. A |
240 | return value of PROC_BAD indicates that PID wasn't found. */ | |
241 | static int | |
242 | find_termsig_by_pid (pid) | |
243 | pid_t pid; | |
244 | { | |
245 | int i; | |
246 | ||
247 | i = find_index_by_pid (pid); | |
248 | if (i == NO_PID) | |
249 | return (0); | |
250 | if (pid_list[i].flags & PROC_RUNNING) | |
251 | return (0); | |
252 | return (get_termsig (pid_list[i].status)); | |
253 | } | |
254 | ||
255 | /* Set LAST_COMMAND_EXIT_SIGNAL depending on STATUS. If STATUS is -1, look | |
256 | up PID in the pid array and set LAST_COMMAND_EXIT_SIGNAL appropriately | |
257 | depending on its flags and exit status. */ | |
258 | static int | |
259 | get_termsig (status) | |
260 | WAIT status; | |
261 | { | |
262 | if (WIFSTOPPED (status) == 0 && WIFSIGNALED (status)) | |
263 | return (WTERMSIG (status)); | |
264 | else | |
265 | return (0); | |
266 | } | |
267 | ||
726f6388 JA |
268 | /* Give PID the status value STATUS in the PID_LIST array. */ |
269 | static void | |
270 | set_pid_status (pid, status) | |
271 | pid_t pid; | |
272 | WAIT status; | |
273 | { | |
274 | int slot; | |
275 | ||
276 | slot = find_index_by_pid (pid); | |
277 | if (slot == NO_PID) | |
278 | return; | |
279 | ||
bb70624e JA |
280 | pid_list[slot].status = process_exit_status (status); |
281 | pid_list[slot].flags &= ~PROC_RUNNING; | |
d3a24ed2 CR |
282 | if (WIFSIGNALED (status)) |
283 | pid_list[slot].flags |= PROC_SIGNALED; | |
bb70624e JA |
284 | /* If it's not a background process, mark it as notified so it gets |
285 | cleaned up. */ | |
286 | if ((pid_list[slot].flags & PROC_ASYNC) == 0) | |
287 | pid_list[slot].flags |= PROC_NOTIFIED; | |
288 | } | |
289 | ||
290 | /* Give PID the flags FLAGS in the PID_LIST array. */ | |
291 | static void | |
292 | set_pid_flags (pid, flags) | |
293 | pid_t pid; | |
294 | int flags; | |
295 | { | |
296 | int slot; | |
297 | ||
298 | slot = find_index_by_pid (pid); | |
299 | if (slot == NO_PID) | |
300 | return; | |
301 | ||
302 | pid_list[slot].flags |= flags; | |
303 | } | |
304 | ||
305 | /* Unset FLAGS for PID in the pid list */ | |
306 | static void | |
307 | unset_pid_flags (pid, flags) | |
308 | pid_t pid; | |
309 | int flags; | |
310 | { | |
311 | int slot; | |
312 | ||
313 | slot = find_index_by_pid (pid); | |
314 | if (slot == NO_PID) | |
315 | return; | |
316 | ||
317 | pid_list[slot].flags &= ~flags; | |
726f6388 JA |
318 | } |
319 | ||
d3a24ed2 CR |
320 | /* Return the flags corresponding to PID in the PID_LIST array. */ |
321 | static int | |
322 | get_pid_flags (pid) | |
323 | pid_t pid; | |
324 | { | |
325 | int slot; | |
326 | ||
327 | slot = find_index_by_pid (pid); | |
328 | if (slot == NO_PID) | |
329 | return 0; | |
330 | ||
331 | return (pid_list[slot].flags); | |
332 | } | |
333 | ||
726f6388 | 334 | static void |
bb70624e | 335 | add_pid (pid, async) |
726f6388 | 336 | pid_t pid; |
bb70624e | 337 | int async; |
726f6388 JA |
338 | { |
339 | int slot; | |
340 | ||
341 | slot = find_proc_slot (); | |
bb70624e | 342 | |
726f6388 | 343 | pid_list[slot].pid = pid; |
bb70624e JA |
344 | pid_list[slot].status = -1; |
345 | pid_list[slot].flags = PROC_RUNNING; | |
346 | if (async) | |
347 | pid_list[slot].flags |= PROC_ASYNC; | |
348 | } | |
349 | ||
350 | static void | |
351 | mark_dead_jobs_as_notified (force) | |
352 | int force; | |
353 | { | |
354 | register int i, ndead; | |
355 | ||
356 | /* first, count the number of non-running async jobs if FORCE == 0 */ | |
357 | for (i = ndead = 0; force == 0 && i < pid_list_size; i++) | |
358 | { | |
359 | if (pid_list[i].pid == NO_PID) | |
360 | continue; | |
361 | if (((pid_list[i].flags & PROC_RUNNING) == 0) && | |
362 | (pid_list[i].flags & PROC_ASYNC)) | |
28ef6c31 | 363 | ndead++; |
bb70624e JA |
364 | } |
365 | ||
7117c2d2 JA |
366 | if (child_max < 0) |
367 | child_max = getmaxchild (); | |
368 | if (child_max < 0) | |
369 | child_max = DEFAULT_CHILD_MAX; | |
370 | ||
371 | if (force == 0 && ndead <= child_max) | |
bb70624e JA |
372 | return; |
373 | ||
374 | /* If FORCE == 0, we just mark as many non-running async jobs as notified | |
375 | to bring us under the CHILD_MAX limit. */ | |
376 | for (i = 0; i < pid_list_size; i++) | |
377 | { | |
378 | if (pid_list[i].pid == NO_PID) | |
379 | continue; | |
380 | if (((pid_list[i].flags & PROC_RUNNING) == 0) && | |
381 | pid_list[i].pid != last_asynchronous_pid) | |
382 | { | |
383 | pid_list[i].flags |= PROC_NOTIFIED; | |
7117c2d2 | 384 | if (force == 0 && (pid_list[i].flags & PROC_ASYNC) && --ndead <= child_max) |
bb70624e JA |
385 | break; |
386 | } | |
387 | } | |
726f6388 JA |
388 | } |
389 | ||
bb70624e | 390 | /* Remove all dead, notified jobs from the pid_list. */ |
726f6388 JA |
391 | int |
392 | cleanup_dead_jobs () | |
393 | { | |
394 | register int i; | |
395 | ||
ccc6cda3 | 396 | #if defined (HAVE_WAITPID) |
726f6388 JA |
397 | reap_zombie_children (); |
398 | #endif | |
399 | ||
400 | for (i = 0; i < pid_list_size; i++) | |
bb70624e JA |
401 | { |
402 | if ((pid_list[i].flags & PROC_RUNNING) == 0 && | |
403 | (pid_list[i].flags & PROC_NOTIFIED)) | |
404 | pid_list[i].pid = NO_PID; | |
405 | } | |
406 | ||
407 | return 0; | |
408 | } | |
409 | ||
410 | void | |
411 | reap_dead_jobs () | |
412 | { | |
413 | mark_dead_jobs_as_notified (0); | |
414 | cleanup_dead_jobs (); | |
726f6388 JA |
415 | } |
416 | ||
417 | /* Initialize the job control mechanism, and set up the tty stuff. */ | |
d166f048 JA |
418 | initialize_job_control (force) |
419 | int force; | |
726f6388 | 420 | { |
d166f048 JA |
421 | shell_tty = fileno (stderr); |
422 | ||
423 | if (interactive) | |
424 | get_tty_state (); | |
726f6388 JA |
425 | } |
426 | ||
ccc6cda3 JA |
427 | #if defined (TIOCGWINSZ) && defined (SIGWINCH) |
428 | static SigHandler *old_winch = (SigHandler *)SIG_DFL; | |
429 | ||
430 | static void | |
431 | get_new_window_size (from_sig) | |
432 | int from_sig; | |
433 | { | |
434 | struct winsize win; | |
435 | int tty; | |
436 | ||
d166f048 | 437 | tty = input_tty (); |
ccc6cda3 JA |
438 | if (tty >= 0 && (ioctl (tty, TIOCGWINSZ, &win) == 0) && |
439 | win.ws_row > 0 && win.ws_col > 0) | |
440 | { | |
441 | #if defined (aixpc) | |
442 | shell_tty_info.c_winsize = win; /* structure copying */ | |
443 | #endif | |
28ef6c31 | 444 | sh_set_lines_and_columns (win.ws_row, win.ws_col); |
ccc6cda3 | 445 | #if defined (READLINE) |
28ef6c31 | 446 | rl_set_screen_size (win.ws_row, win.ws_col); |
ccc6cda3 JA |
447 | #endif |
448 | } | |
ccc6cda3 | 449 | } |
726f6388 JA |
450 | |
451 | static sighandler | |
452 | sigwinch_sighandler (sig) | |
453 | int sig; | |
454 | { | |
ccc6cda3 | 455 | #if defined (MUST_REINSTALL_SIGHANDLERS) |
726f6388 | 456 | set_signal_handler (SIGWINCH, sigwinch_sighandler); |
ccc6cda3 JA |
457 | #endif /* MUST_REINSTALL_SIGHANDLERS */ |
458 | get_new_window_size (1); | |
459 | } | |
460 | #else | |
461 | static void | |
462 | get_new_window_size (from_sig) | |
463 | int from_sig; | |
464 | { | |
465 | } | |
466 | #endif /* TIOCGWINSZ && SIGWINCH */ | |
467 | ||
468 | void | |
469 | set_sigwinch_handler () | |
470 | { | |
471 | #if defined (TIOCGWINSZ) && defined (SIGWINCH) | |
472 | old_winch = set_signal_handler (SIGWINCH, sigwinch_sighandler); | |
473 | #endif | |
474 | } | |
475 | ||
476 | void | |
477 | unset_sigwinch_handler () | |
478 | { | |
479 | #if defined (TIOCGWINSZ) && defined (SIGWINCH) | |
480 | set_signal_handler (SIGWINCH, old_winch); | |
481 | #endif | |
726f6388 | 482 | } |
726f6388 JA |
483 | |
484 | /* Setup this shell to handle C-C, etc. */ | |
485 | void | |
486 | initialize_job_signals () | |
487 | { | |
488 | set_signal_handler (SIGINT, sigint_sighandler); | |
ccc6cda3 | 489 | set_sigwinch_handler (); |
726f6388 JA |
490 | |
491 | /* If this is a login shell we don't wish to be disturbed by | |
492 | stop signals. */ | |
493 | if (login_shell) | |
ccc6cda3 | 494 | ignore_tty_job_signals (); |
726f6388 JA |
495 | } |
496 | ||
ccc6cda3 | 497 | #if defined (HAVE_WAITPID) |
726f6388 JA |
498 | /* Collect the status of all zombie children so that their system |
499 | resources can be deallocated. */ | |
500 | static void | |
501 | reap_zombie_children () | |
502 | { | |
5e13499c | 503 | # if defined (WNOHANG) |
726f6388 JA |
504 | pid_t pid; |
505 | WAIT status; | |
506 | ||
507 | while ((pid = waitpid (-1, (int *)&status, WNOHANG)) > 0) | |
508 | set_pid_status (pid, status); | |
5e13499c CR |
509 | # endif /* WNOHANG */ |
510 | } | |
511 | #endif /* WAITPID */ | |
512 | ||
513 | #if !defined (HAVE_SIGINTERRUPT) && defined (HAVE_POSIX_SIGNALS) | |
514 | static int | |
515 | siginterrupt (sig, flag) | |
516 | int sig, flag; | |
517 | { | |
518 | struct sigaction act; | |
519 | ||
520 | sigaction (sig, (struct sigaction *)NULL, &act); | |
521 | ||
522 | if (flag) | |
523 | act.sa_flags &= ~SA_RESTART; | |
524 | else | |
525 | act.sa_flags |= SA_RESTART; | |
526 | ||
527 | return (sigaction (sig, &act, (struct sigaction *)NULL)); | |
726f6388 | 528 | } |
5e13499c | 529 | #endif /* !HAVE_SIGINTERRUPT && HAVE_POSIX_SIGNALS */ |
726f6388 JA |
530 | |
531 | /* Fork, handling errors. Returns the pid of the newly made child, or 0. | |
532 | COMMAND is just for remembering the name of the command; we don't do | |
533 | anything else with it. ASYNC_P says what to do with the tty. If | |
534 | non-zero, then don't give it away. */ | |
535 | pid_t | |
536 | make_child (command, async_p) | |
537 | char *command; | |
538 | int async_p; | |
539 | { | |
540 | pid_t pid; | |
ccc6cda3 | 541 | #if defined (HAVE_WAITPID) |
726f6388 | 542 | int retry = 1; |
ccc6cda3 | 543 | #endif /* HAVE_WAITPID */ |
726f6388 JA |
544 | |
545 | /* Discard saved memory. */ | |
ccc6cda3 | 546 | if (command) |
726f6388 JA |
547 | free (command); |
548 | ||
549 | start_pipeline (); | |
550 | ||
551 | #if defined (BUFFERED_INPUT) | |
552 | /* If default_buffered_input is active, we are reading a script. If | |
553 | the command is asynchronous, we have already duplicated /dev/null | |
554 | as fd 0, but have not changed the buffered stream corresponding to | |
555 | the old fd 0. We don't want to sync the stream in this case. */ | |
cce855bc | 556 | if (default_buffered_input != -1 && (!async_p || default_buffered_input > 0)) |
726f6388 JA |
557 | sync_buffered_stream (default_buffered_input); |
558 | #endif /* BUFFERED_INPUT */ | |
559 | ||
560 | /* Create the child, handle severe errors. */ | |
ccc6cda3 | 561 | #if defined (HAVE_WAITPID) |
726f6388 | 562 | retry_fork: |
ccc6cda3 | 563 | #endif /* HAVE_WAITPID */ |
726f6388 JA |
564 | |
565 | if ((pid = fork ()) < 0) | |
566 | { | |
ccc6cda3 | 567 | #if defined (HAVE_WAITPID) |
726f6388 JA |
568 | /* Posix systems with a non-blocking waitpid () system call available |
569 | get another chance after zombies are reaped. */ | |
570 | if (errno == EAGAIN && retry) | |
571 | { | |
572 | reap_zombie_children (); | |
573 | retry = 0; | |
574 | goto retry_fork; | |
575 | } | |
ccc6cda3 | 576 | #endif /* HAVE_WAITPID */ |
726f6388 | 577 | |
ccc6cda3 | 578 | sys_error ("fork"); |
726f6388 JA |
579 | |
580 | throw_to_top_level (); | |
581 | } | |
ccc6cda3 | 582 | |
726f6388 JA |
583 | if (pid == 0) |
584 | { | |
585 | #if defined (BUFFERED_INPUT) | |
cce855bc | 586 | unset_bash_input (0); |
726f6388 JA |
587 | #endif /* BUFFERED_INPUT */ |
588 | ||
ccc6cda3 | 589 | #if defined (HAVE_POSIX_SIGNALS) |
726f6388 JA |
590 | /* Restore top-level signal mask. */ |
591 | sigprocmask (SIG_SETMASK, &top_level_mask, (sigset_t *)NULL); | |
592 | #endif | |
593 | ||
594 | /* Ignore INT and QUIT in asynchronous children. */ | |
595 | if (async_p) | |
ccc6cda3 | 596 | last_asynchronous_pid = getpid (); |
726f6388 | 597 | |
ccc6cda3 | 598 | default_tty_job_signals (); |
726f6388 JA |
599 | } |
600 | else | |
601 | { | |
602 | /* In the parent. */ | |
603 | ||
604 | last_made_pid = pid; | |
605 | ||
606 | if (async_p) | |
607 | last_asynchronous_pid = pid; | |
608 | ||
bb70624e | 609 | add_pid (pid, async_p); |
726f6388 JA |
610 | } |
611 | return (pid); | |
612 | } | |
613 | ||
ccc6cda3 JA |
614 | void |
615 | ignore_tty_job_signals () | |
616 | { | |
617 | #if defined (SIGTSTP) | |
618 | set_signal_handler (SIGTSTP, SIG_IGN); | |
619 | set_signal_handler (SIGTTIN, SIG_IGN); | |
620 | set_signal_handler (SIGTTOU, SIG_IGN); | |
621 | #endif | |
622 | } | |
623 | ||
624 | void | |
625 | default_tty_job_signals () | |
626 | { | |
627 | #if defined (SIGTSTP) | |
628 | set_signal_handler (SIGTSTP, SIG_DFL); | |
629 | set_signal_handler (SIGTTIN, SIG_DFL); | |
630 | set_signal_handler (SIGTTOU, SIG_DFL); | |
631 | #endif | |
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 | { | |
662 | if (got_pid < 0) | |
663 | { | |
664 | if (errno != EINTR && errno != ECHILD) | |
665 | { | |
666 | siginterrupt (SIGINT, 0); | |
ccc6cda3 | 667 | sys_error ("wait"); |
726f6388 JA |
668 | } |
669 | break; | |
670 | } | |
671 | else if (got_pid > 0) | |
28ef6c31 | 672 | set_pid_status (got_pid, status); |
726f6388 JA |
673 | } |
674 | ||
7117c2d2 JA |
675 | if (got_pid > 0) |
676 | { | |
677 | set_pid_status (got_pid, status); | |
678 | set_pid_flags (got_pid, PROC_NOTIFIED); | |
679 | } | |
bb70624e | 680 | |
726f6388 JA |
681 | siginterrupt (SIGINT, 0); |
682 | QUIT; | |
683 | ||
7117c2d2 | 684 | return (got_pid > 0 ? process_exit_status (status) : -1); |
726f6388 JA |
685 | } |
686 | ||
bb70624e JA |
687 | /* Wait for all of the shell's children to exit. Called by the `wait' |
688 | builtin. */ | |
726f6388 JA |
689 | void |
690 | wait_for_background_pids () | |
691 | { | |
692 | pid_t got_pid; | |
693 | WAIT status; | |
694 | ||
695 | /* If we aren't using job control, we let the kernel take care of the | |
ccc6cda3 | 696 | bookkeeping for us. wait () will return -1 and set errno to ECHILD |
726f6388 JA |
697 | when there are no more unwaited-for child processes on both |
698 | 4.2 BSD-based and System V-based systems. */ | |
699 | ||
700 | siginterrupt (SIGINT, 1); | |
701 | ||
702 | /* Wait for ECHILD */ | |
703 | while ((got_pid = WAITPID (-1, &status, 0)) != -1) | |
704 | set_pid_status (got_pid, status); | |
705 | ||
706 | if (errno != EINTR && errno != ECHILD) | |
707 | { | |
708 | siginterrupt (SIGINT, 0); | |
ccc6cda3 | 709 | sys_error("wait"); |
726f6388 JA |
710 | } |
711 | ||
712 | siginterrupt (SIGINT, 0); | |
713 | QUIT; | |
bb70624e JA |
714 | |
715 | mark_dead_jobs_as_notified (1); | |
716 | cleanup_dead_jobs (); | |
717 | } | |
718 | ||
719 | /* Make OLD_SIGINT_HANDLER the SIGINT signal handler. */ | |
720 | #define INVALID_SIGNAL_HANDLER (SigHandler *)wait_for_background_pids | |
721 | static SigHandler *old_sigint_handler = INVALID_SIGNAL_HANDLER; | |
722 | ||
723 | static void | |
724 | restore_sigint_handler () | |
725 | { | |
726 | if (old_sigint_handler != INVALID_SIGNAL_HANDLER) | |
727 | { | |
728 | set_signal_handler (SIGINT, old_sigint_handler); | |
729 | old_sigint_handler = INVALID_SIGNAL_HANDLER; | |
730 | } | |
726f6388 JA |
731 | } |
732 | ||
733 | /* Handle SIGINT while we are waiting for children in a script to exit. | |
734 | All interrupts are effectively ignored by the shell, but allowed to | |
735 | kill a running job. */ | |
736 | static sighandler | |
737 | wait_sigint_handler (sig) | |
738 | int sig; | |
739 | { | |
bb70624e JA |
740 | SigHandler *sigint_handler; |
741 | ||
742 | /* If we got a SIGINT while in `wait', and SIGINT is trapped, do | |
743 | what POSIX.2 says (see builtins/wait.def for more info). */ | |
744 | if (this_shell_builtin && this_shell_builtin == wait_builtin && | |
745 | signal_is_trapped (SIGINT) && | |
746 | ((sigint_handler = trap_to_sighandler (SIGINT)) == trap_handler)) | |
747 | { | |
748 | last_command_exit_value = EXECUTION_FAILURE; | |
749 | restore_sigint_handler (); | |
750 | interrupt_immediately = 0; | |
751 | trap_handler (SIGINT); /* set pending_traps[SIGINT] */ | |
7117c2d2 | 752 | wait_signal_received = SIGINT; |
bb70624e JA |
753 | longjmp (wait_intr_buf, 1); |
754 | } | |
755 | ||
28ef6c31 JA |
756 | if (interrupt_immediately) |
757 | { | |
758 | last_command_exit_value = EXECUTION_FAILURE; | |
759 | restore_sigint_handler (); | |
760 | ADDINTERRUPT; | |
761 | QUIT; | |
762 | } | |
726f6388 | 763 | |
bb70624e JA |
764 | wait_sigint_received = 1; |
765 | ||
ccc6cda3 | 766 | SIGRETURN (0); |
726f6388 JA |
767 | } |
768 | ||
d3a24ed2 CR |
769 | static char * |
770 | j_strsignal (s) | |
771 | int s; | |
772 | { | |
773 | static char retcode_name_buffer[64] = { '\0' }; | |
774 | char *x; | |
775 | ||
776 | x = strsignal (s); | |
777 | if (x == 0) | |
778 | { | |
779 | x = retcode_name_buffer; | |
780 | sprintf (x, "Signal %d", s); | |
781 | } | |
782 | return x; | |
783 | } | |
784 | ||
726f6388 JA |
785 | /* Wait for pid (one of our children) to terminate. This is called only |
786 | by the execution code in execute_cmd.c. */ | |
787 | int | |
788 | wait_for (pid) | |
789 | pid_t pid; | |
790 | { | |
791 | int return_val, pstatus; | |
792 | pid_t got_pid; | |
793 | WAIT status; | |
726f6388 JA |
794 | |
795 | pstatus = find_status_by_pid (pid); | |
796 | ||
797 | if (pstatus == PROC_BAD) | |
798 | return (0); | |
799 | ||
800 | if (pstatus != PROC_STILL_ALIVE) | |
d3a24ed2 CR |
801 | { |
802 | if (pstatus > 128) | |
803 | last_command_exit_signal = find_termsig_by_pid (pid); | |
804 | return (pstatus); | |
805 | } | |
726f6388 JA |
806 | |
807 | /* If we are running a script, ignore SIGINT while we're waiting for | |
808 | a child to exit. The loop below does some of this, but not all. */ | |
bb70624e JA |
809 | wait_sigint_received = 0; |
810 | if (interactive_shell == 0) | |
726f6388 JA |
811 | old_sigint_handler = set_signal_handler (SIGINT, wait_sigint_handler); |
812 | ||
813 | while ((got_pid = WAITPID (-1, &status, 0)) != pid) /* XXX was pid now -1 */ | |
814 | { | |
815 | if (got_pid < 0 && errno == ECHILD) | |
816 | { | |
817 | #if !defined (_POSIX_VERSION) | |
818 | status.w_termsig = status.w_retcode = 0; | |
819 | #else | |
820 | status = 0; | |
821 | #endif /* _POSIX_VERSION */ | |
822 | break; | |
823 | } | |
824 | else if (got_pid < 0 && errno != EINTR) | |
f73dda09 | 825 | programming_error ("wait_for(%ld): %s", (long)pid, strerror(errno)); |
726f6388 JA |
826 | else if (got_pid > 0) |
827 | set_pid_status (got_pid, status); | |
828 | } | |
829 | ||
7117c2d2 JA |
830 | if (got_pid > 0) |
831 | set_pid_status (got_pid, status); | |
726f6388 | 832 | |
ccc6cda3 | 833 | #if defined (HAVE_WAITPID) |
726f6388 JA |
834 | if (got_pid >= 0) |
835 | reap_zombie_children (); | |
ccc6cda3 | 836 | #endif /* HAVE_WAITPID */ |
726f6388 | 837 | |
ccc6cda3 | 838 | if (interactive_shell == 0) |
726f6388 | 839 | { |
bb70624e JA |
840 | SigHandler *temp_handler; |
841 | ||
842 | temp_handler = old_sigint_handler; | |
843 | restore_sigint_handler (); | |
844 | ||
726f6388 JA |
845 | /* If the job exited because of SIGINT, make sure the shell acts as if |
846 | it had received one also. */ | |
847 | if (WIFSIGNALED (status) && (WTERMSIG (status) == SIGINT)) | |
848 | { | |
bb70624e | 849 | |
726f6388 | 850 | if (maybe_call_trap_handler (SIGINT) == 0) |
bb70624e JA |
851 | { |
852 | if (temp_handler == SIG_DFL) | |
853 | termination_unwind_protect (SIGINT); | |
854 | else if (temp_handler != INVALID_SIGNAL_HANDLER && temp_handler != SIG_IGN) | |
855 | (*temp_handler) (SIGINT); | |
856 | } | |
726f6388 JA |
857 | } |
858 | } | |
ccc6cda3 | 859 | |
726f6388 JA |
860 | /* Default return value. */ |
861 | /* ``a full 8 bits of status is returned'' */ | |
bb70624e | 862 | return_val = process_exit_status (status); |
d3a24ed2 | 863 | last_command_exit_signal = get_termsig (status); |
ccc6cda3 | 864 | |
d166f048 JA |
865 | #if !defined (DONT_REPORT_SIGPIPE) |
866 | if ((WIFSTOPPED (status) == 0) && WIFSIGNALED (status) && | |
867 | (WTERMSIG (status) != SIGINT)) | |
868 | #else | |
869 | if ((WIFSTOPPED (status) == 0) && WIFSIGNALED (status) && | |
870 | (WTERMSIG (status) != SIGINT) && (WTERMSIG (status) != SIGPIPE)) | |
871 | #endif | |
726f6388 | 872 | { |
d3a24ed2 | 873 | fprintf (stderr, "%s", j_strsignal (WTERMSIG (status))); |
726f6388 JA |
874 | if (WIFCORED (status)) |
875 | fprintf (stderr, " (core dumped)"); | |
876 | fprintf (stderr, "\n"); | |
877 | } | |
878 | ||
ccc6cda3 | 879 | if (interactive_shell && subshell_environment == 0) |
726f6388 JA |
880 | { |
881 | if (WIFSIGNALED (status) || WIFSTOPPED (status)) | |
882 | set_tty_state (); | |
883 | else | |
884 | get_tty_state (); | |
885 | } | |
886 | ||
887 | return (return_val); | |
888 | } | |
889 | ||
890 | /* Give PID SIGNAL. This determines what job the pid belongs to (if any). | |
891 | If PID does belong to a job, and the job is stopped, then CONTinue the | |
892 | job after giving it SIGNAL. Returns -1 on failure. If GROUP is non-null, | |
893 | then kill the process group associated with PID. */ | |
894 | int | |
895 | kill_pid (pid, signal, group) | |
896 | pid_t pid; | |
897 | int signal, group; | |
898 | { | |
899 | int result; | |
900 | ||
bb70624e | 901 | result = group ? killpg (pid, signal) : kill (pid, signal); |
726f6388 JA |
902 | return (result); |
903 | } | |
904 | ||
bb70624e | 905 | static TTYSTRUCT shell_tty_info; |
ccc6cda3 | 906 | static int got_tty_state; |
726f6388 JA |
907 | |
908 | /* Fill the contents of shell_tty_info with the current tty info. */ | |
909 | get_tty_state () | |
910 | { | |
ccc6cda3 JA |
911 | int tty; |
912 | ||
d166f048 | 913 | tty = input_tty (); |
726f6388 JA |
914 | if (tty != -1) |
915 | { | |
bb70624e | 916 | ttgetattr (tty, &shell_tty_info); |
726f6388 | 917 | got_tty_state = 1; |
ccc6cda3 JA |
918 | if (check_window_size) |
919 | get_new_window_size (0); | |
726f6388 JA |
920 | } |
921 | } | |
922 | ||
923 | /* Make the current tty use the state in shell_tty_info. */ | |
b72432fd | 924 | int |
726f6388 JA |
925 | set_tty_state () |
926 | { | |
ccc6cda3 JA |
927 | int tty; |
928 | ||
d166f048 | 929 | tty = input_tty (); |
726f6388 JA |
930 | if (tty != -1) |
931 | { | |
ccc6cda3 | 932 | if (got_tty_state == 0) |
b72432fd | 933 | return 0; |
bb70624e | 934 | ttsetattr (tty, &shell_tty_info); |
726f6388 | 935 | } |
b72432fd | 936 | return 0; |
726f6388 JA |
937 | } |
938 | ||
939 | /* Give the terminal to PGRP. */ | |
28ef6c31 | 940 | give_terminal_to (pgrp, force) |
726f6388 | 941 | pid_t pgrp; |
28ef6c31 | 942 | int force; |
726f6388 JA |
943 | { |
944 | } | |
945 | ||
946 | /* Stop a pipeline. */ | |
f73dda09 | 947 | int |
726f6388 JA |
948 | stop_pipeline (async, ignore) |
949 | int async; | |
950 | COMMAND *ignore; | |
951 | { | |
952 | already_making_children = 0; | |
f73dda09 | 953 | return 0; |
726f6388 JA |
954 | } |
955 | ||
956 | void | |
957 | start_pipeline () | |
958 | { | |
959 | already_making_children = 1; | |
960 | } | |
961 | ||
f73dda09 JA |
962 | void |
963 | stop_making_children () | |
964 | { | |
965 | already_making_children = 0; | |
966 | } | |
967 | ||
d166f048 JA |
968 | int |
969 | get_job_by_pid (pid, block) | |
970 | pid_t pid; | |
971 | int block; | |
972 | { | |
973 | int i; | |
974 | ||
975 | i = find_index_by_pid (pid); | |
976 | return ((i == NO_PID) ? PROC_BAD : i); | |
977 | } | |
978 | ||
726f6388 JA |
979 | /* Print descriptive information about the job with leader pid PID. */ |
980 | void | |
981 | describe_pid (pid) | |
982 | pid_t pid; | |
983 | { | |
f73dda09 | 984 | fprintf (stderr, "%ld\n", (long) pid); |
726f6388 | 985 | } |
ccc6cda3 JA |
986 | |
987 | void | |
988 | unfreeze_jobs_list () | |
989 | { | |
990 | } | |
bb70624e JA |
991 | |
992 | int | |
993 | count_all_jobs () | |
994 | { | |
995 | return 0; | |
996 | } |