1 /* nojobs.c - functions that make children, remember them, and handle their termination. */
2
3 /* This file works under BSD, System V, minix, and Posix systems. It does
4 not implement job control. */
5
6 /* Copyright (C) 1987-2020 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
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.
14
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.
19
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 */
23
24 #include "config.h"
25
26 #include "bashtypes.h"
27 #include "filecntl.h"
28
29 #if defined (HAVE_UNISTD_H)
30 # include <unistd.h>
31 #endif
32
33 #include <stdio.h>
34 #include <signal.h>
35 #include <errno.h>
36
37 #if defined (BUFFERED_INPUT)
38 # include "input.h"
39 #endif
40
41 /* Need to include this up here for *_TTY_DRIVER definitions. */
42 #include "shtty.h"
43
44 #include "bashintl.h"
45
46 #include "shell.h"
47 #include "jobs.h"
48 #include "execute_cmd.h"
49 #include "trap.h"
50
51 #include "builtins/builtext.h" /* for wait_builtin */
52 #include "builtins/common.h"
53
54 #define DEFAULT_CHILD_MAX 4096
55
56 #if defined (_POSIX_VERSION) || !defined (HAVE_KILLPG)
57 # define killpg(pg, sig) kill(-(pg),(sig))
58 #endif /* USG || _POSIX_VERSION */
59
60 #if !defined (HAVE_SIGINTERRUPT) && !defined (HAVE_POSIX_SIGNALS)
61 # define siginterrupt(sig, code)
62 #endif /* !HAVE_SIGINTERRUPT && !HAVE_POSIX_SIGNALS */
63
64 #if defined (HAVE_WAITPID)
65 # define WAITPID(pid, statusp, options) waitpid (pid, statusp, options)
66 #else
67 # define WAITPID(pid, statusp, options) wait (statusp)
68 #endif /* !HAVE_WAITPID */
69
70 /* Return the fd from which we are actually getting input. */
71 #define input_tty() (shell_tty != -1) ? shell_tty : fileno (stderr)
72
73 #if !defined (errno)
74 extern int errno;
75 #endif /* !errno */
76
77 extern void set_original_signal PARAMS((int, SigHandler *));
78
79 volatile pid_t last_made_pid = NO_PID;
80 volatile pid_t last_asynchronous_pid = NO_PID;
81
82 static int queue_sigchld; /* dummy declaration */
83 int waiting_for_child;
84
85 /* Call this when you start making children. */
86 int already_making_children = 0;
87
88 /* The controlling tty for this shell. */
89 int shell_tty = -1;
90
91 /* If this is non-zero, $LINES and $COLUMNS are reset after every process
92 exits from get_tty_state(). */
93 int check_window_size = CHECKWINSIZE_DEFAULT;
94
95 /* We don't have job control. */
96 int job_control = 0;
97
98 int running_in_background = 0; /* can't tell without job control */
99
100 /* STATUS and FLAGS are only valid if pid != NO_PID
101 STATUS is only valid if (flags & PROC_RUNNING) == 0 */
102 struct proc_status {
103 pid_t pid;
104 int status; /* Exit status of PID or 128 + fatal signal number */
105 int flags;
106 };
107
108 /* Values for proc_status.flags */
109 #define PROC_RUNNING 0x01
110 #define PROC_NOTIFIED 0x02
111 #define PROC_ASYNC 0x04
112 #define PROC_SIGNALED 0x10
113
114 /* Return values from find_status_by_pid */
115 #define PROC_BAD -1
116 #define PROC_STILL_ALIVE -2
117
118 static struct proc_status *pid_list = (struct proc_status *)NULL;
119 static int pid_list_size;
120 static int wait_sigint_received;
121
122 static long child_max = -1L;
123
124 static void alloc_pid_list PARAMS((void));
125 static int find_proc_slot PARAMS((pid_t));
126 static int find_index_by_pid PARAMS((pid_t));
127 static int find_status_by_pid PARAMS((pid_t));
128 static int process_exit_status PARAMS((WAIT));
129 static int find_termsig_by_pid PARAMS((pid_t));
130 static int get_termsig PARAMS((WAIT));
131 static void set_pid_status PARAMS((pid_t, WAIT));
132 static void set_pid_flags PARAMS((pid_t, int));
133 static void unset_pid_flags PARAMS((pid_t, int));
134 static int get_pid_flags PARAMS((pid_t));
135 static void add_pid PARAMS((pid_t, int));
136 static void mark_dead_jobs_as_notified PARAMS((int));
137
138 static sighandler wait_sigint_handler PARAMS((int));
139 static char *j_strsignal PARAMS((int));
140
141 #if defined (HAVE_WAITPID)
142 static void reap_zombie_children PARAMS((void));
143 #endif
144
145 #if !defined (HAVE_SIGINTERRUPT) && defined (HAVE_POSIX_SIGNALS)
146 static int siginterrupt PARAMS((int, int));
147 #endif
148
149 static void restore_sigint_handler PARAMS((void));
150
151 /* Allocate new, or grow existing PID_LIST. */
152 static void
alloc_pid_list()153 alloc_pid_list ()
154 {
155 register int i;
156 int old = pid_list_size;
157
158 pid_list_size += 10;
159 pid_list = (struct proc_status *)xrealloc (pid_list, pid_list_size * sizeof (struct proc_status));
160
161 /* None of the newly allocated slots have process id's yet. */
162 for (i = old; i < pid_list_size; i++)
163 {
164 pid_list[i].pid = NO_PID;
165 pid_list[i].status = pid_list[i].flags = 0;
166 }
167 }
168
169 /* Return the offset within the PID_LIST array of an empty slot. This can
170 create new slots if all of the existing slots are taken. */
171 static int
find_proc_slot(pid)172 find_proc_slot (pid)
173 pid_t pid;
174 {
175 register int i;
176
177 for (i = 0; i < pid_list_size; i++)
178 if (pid_list[i].pid == NO_PID || pid_list[i].pid == pid)
179 return (i);
180
181 if (i == pid_list_size)
182 alloc_pid_list ();
183
184 return (i);
185 }
186
187 /* Return the offset within the PID_LIST array of a slot containing PID,
188 or the value NO_PID if the pid wasn't found. */
189 static int
find_index_by_pid(pid)190 find_index_by_pid (pid)
191 pid_t pid;
192 {
193 register int i;
194
195 for (i = 0; i < pid_list_size; i++)
196 if (pid_list[i].pid == pid)
197 return (i);
198
199 return (NO_PID);
200 }
201
202 /* Return the status of PID as looked up in the PID_LIST array. A
203 return value of PROC_BAD indicates that PID wasn't found. */
204 static int
find_status_by_pid(pid)205 find_status_by_pid (pid)
206 pid_t pid;
207 {
208 int i;
209
210 i = find_index_by_pid (pid);
211 if (i == NO_PID)
212 return (PROC_BAD);
213 if (pid_list[i].flags & PROC_RUNNING)
214 return (PROC_STILL_ALIVE);
215 return (pid_list[i].status);
216 }
217
218 static int
process_exit_status(status)219 process_exit_status (status)
220 WAIT status;
221 {
222 if (WIFSIGNALED (status))
223 return (128 + WTERMSIG (status));
224 else
225 return (WEXITSTATUS (status));
226 }
227
228 /* Return the status of PID as looked up in the PID_LIST array. A
229 return value of PROC_BAD indicates that PID wasn't found. */
230 static int
find_termsig_by_pid(pid)231 find_termsig_by_pid (pid)
232 pid_t pid;
233 {
234 int i;
235
236 i = find_index_by_pid (pid);
237 if (i == NO_PID)
238 return (0);
239 if (pid_list[i].flags & PROC_RUNNING)
240 return (0);
241 return (get_termsig ((WAIT)pid_list[i].status));
242 }
243
244 /* Set LAST_COMMAND_EXIT_SIGNAL depending on STATUS. If STATUS is -1, look
245 up PID in the pid array and set LAST_COMMAND_EXIT_SIGNAL appropriately
246 depending on its flags and exit status. */
247 static int
get_termsig(status)248 get_termsig (status)
249 WAIT status;
250 {
251 if (WIFSTOPPED (status) == 0 && WIFSIGNALED (status))
252 return (WTERMSIG (status));
253 else
254 return (0);
255 }
256
257 /* Give PID the status value STATUS in the PID_LIST array. */
258 static void
set_pid_status(pid,status)259 set_pid_status (pid, status)
260 pid_t pid;
261 WAIT status;
262 {
263 int slot;
264
265 #if defined (COPROCESS_SUPPORT)
266 coproc_pidchk (pid, status);
267 #endif
268
269 #if defined (PROCESS_SUBSTITUTION)
270 if ((slot = find_procsub_child (pid)) >= 0)
271 set_procsub_status (slot, pid, WSTATUS (status));
272 /* XXX - also saving in list below */
273 #endif
274
275 slot = find_index_by_pid (pid);
276 if (slot == NO_PID)
277 return;
278
279 pid_list[slot].status = process_exit_status (status);
280 pid_list[slot].flags &= ~PROC_RUNNING;
281 if (WIFSIGNALED (status))
282 pid_list[slot].flags |= PROC_SIGNALED;
283 /* If it's not a background process, mark it as notified so it gets
284 cleaned up. */
285 if ((pid_list[slot].flags & PROC_ASYNC) == 0)
286 pid_list[slot].flags |= PROC_NOTIFIED;
287 }
288
289 /* Give PID the flags FLAGS in the PID_LIST array. */
290 static void
set_pid_flags(pid,flags)291 set_pid_flags (pid, flags)
292 pid_t pid;
293 int flags;
294 {
295 int slot;
296
297 slot = find_index_by_pid (pid);
298 if (slot == NO_PID)
299 return;
300
301 pid_list[slot].flags |= flags;
302 }
303
304 /* Unset FLAGS for PID in the pid list */
305 static void
unset_pid_flags(pid,flags)306 unset_pid_flags (pid, flags)
307 pid_t pid;
308 int flags;
309 {
310 int slot;
311
312 slot = find_index_by_pid (pid);
313 if (slot == NO_PID)
314 return;
315
316 pid_list[slot].flags &= ~flags;
317 }
318
319 /* Return the flags corresponding to PID in the PID_LIST array. */
320 static int
get_pid_flags(pid)321 get_pid_flags (pid)
322 pid_t pid;
323 {
324 int slot;
325
326 slot = find_index_by_pid (pid);
327 if (slot == NO_PID)
328 return 0;
329
330 return (pid_list[slot].flags);
331 }
332
333 static void
add_pid(pid,async)334 add_pid (pid, async)
335 pid_t pid;
336 int async;
337 {
338 int slot;
339
340 slot = find_proc_slot (pid);
341
342 pid_list[slot].pid = pid;
343 pid_list[slot].status = -1;
344 pid_list[slot].flags = PROC_RUNNING;
345 if (async)
346 pid_list[slot].flags |= PROC_ASYNC;
347 }
348
349 static void
mark_dead_jobs_as_notified(force)350 mark_dead_jobs_as_notified (force)
351 int force;
352 {
353 register int i, ndead;
354
355 /* first, count the number of non-running async jobs if FORCE == 0 */
356 for (i = ndead = 0; force == 0 && i < pid_list_size; i++)
357 {
358 if (pid_list[i].pid == NO_PID)
359 continue;
360 if (((pid_list[i].flags & PROC_RUNNING) == 0) &&
361 (pid_list[i].flags & PROC_ASYNC))
362 ndead++;
363 }
364
365 if (child_max < 0)
366 child_max = getmaxchild ();
367 if (child_max < 0)
368 child_max = DEFAULT_CHILD_MAX;
369
370 if (force == 0 && ndead <= child_max)
371 return;
372
373 /* If FORCE == 0, we just mark as many non-running async jobs as notified
374 to bring us under the CHILD_MAX limit. */
375 for (i = 0; i < pid_list_size; i++)
376 {
377 if (pid_list[i].pid == NO_PID)
378 continue;
379 if (((pid_list[i].flags & PROC_RUNNING) == 0) &&
380 pid_list[i].pid != last_asynchronous_pid)
381 {
382 pid_list[i].flags |= PROC_NOTIFIED;
383 if (force == 0 && (pid_list[i].flags & PROC_ASYNC) && --ndead <= child_max)
384 break;
385 }
386 }
387 }
388
389 /* Remove all dead, notified jobs from the pid_list. */
390 int
cleanup_dead_jobs()391 cleanup_dead_jobs ()
392 {
393 register int i;
394
395 #if defined (HAVE_WAITPID)
396 reap_zombie_children ();
397 #endif
398
399 for (i = 0; i < pid_list_size; i++)
400 {
401 if (pid_list[i].pid != NO_PID &&
402 (pid_list[i].flags & PROC_RUNNING) == 0 &&
403 (pid_list[i].flags & PROC_NOTIFIED))
404 pid_list[i].pid = NO_PID;
405 }
406
407 #if defined (COPROCESS_SUPPORT)
408 coproc_reap ();
409 #endif
410
411 return 0;
412 }
413
414 void
reap_dead_jobs()415 reap_dead_jobs ()
416 {
417 mark_dead_jobs_as_notified (0);
418 cleanup_dead_jobs ();
419 }
420
421 /* Initialize the job control mechanism, and set up the tty stuff. */
422 int
initialize_job_control(force)423 initialize_job_control (force)
424 int force;
425 {
426 shell_tty = fileno (stderr);
427
428 if (interactive)
429 get_tty_state ();
430 return 0;
431 }
432
433 /* Setup this shell to handle C-C, etc. */
434 void
initialize_job_signals()435 initialize_job_signals ()
436 {
437 set_signal_handler (SIGINT, sigint_sighandler);
438
439 /* If this is a login shell we don't wish to be disturbed by
440 stop signals. */
441 if (login_shell)
442 ignore_tty_job_signals ();
443 }
444
445 #if defined (HAVE_WAITPID)
446 /* Collect the status of all zombie children so that their system
447 resources can be deallocated. */
448 static void
reap_zombie_children()449 reap_zombie_children ()
450 {
451 # if defined (WNOHANG)
452 pid_t pid;
453 WAIT status;
454
455 CHECK_TERMSIG;
456 CHECK_WAIT_INTR;
457 while ((pid = waitpid (-1, (int *)&status, WNOHANG)) > 0)
458 set_pid_status (pid, status);
459 # endif /* WNOHANG */
460 CHECK_TERMSIG;
461 CHECK_WAIT_INTR;
462 }
463 #endif /* WAITPID */
464
465 #if !defined (HAVE_SIGINTERRUPT) && defined (HAVE_POSIX_SIGNALS)
466
467 #if !defined (SA_RESTART)
468 # define SA_RESTART 0
469 #endif
470
471 static int
siginterrupt(sig,flag)472 siginterrupt (sig, flag)
473 int sig, flag;
474 {
475 struct sigaction act;
476
477 sigaction (sig, (struct sigaction *)NULL, &act);
478
479 if (flag)
480 act.sa_flags &= ~SA_RESTART;
481 else
482 act.sa_flags |= SA_RESTART;
483
484 return (sigaction (sig, &act, (struct sigaction *)NULL));
485 }
486 #endif /* !HAVE_SIGINTERRUPT && HAVE_POSIX_SIGNALS */
487
488 /* Fork, handling errors. Returns the pid of the newly made child, or 0.
489 COMMAND is just for remembering the name of the command; we don't do
490 anything else with it. ASYNC_P says what to do with the tty. If
491 non-zero, then don't give it away. */
492 pid_t
make_child(command,flags)493 make_child (command, flags)
494 char *command;
495 int flags;
496 {
497 pid_t pid;
498 int async_p, forksleep;
499 sigset_t set, oset;
500
501 /* Discard saved memory. */
502 if (command)
503 free (command);
504
505 async_p = (flags & FORK_ASYNC);
506 start_pipeline ();
507
508 #if defined (BUFFERED_INPUT)
509 /* If default_buffered_input is active, we are reading a script. If
510 the command is asynchronous, we have already duplicated /dev/null
511 as fd 0, but have not changed the buffered stream corresponding to
512 the old fd 0. We don't want to sync the stream in this case. */
513 if (default_buffered_input != -1 && (!async_p || default_buffered_input > 0))
514 sync_buffered_stream (default_buffered_input);
515 #endif /* BUFFERED_INPUT */
516
517 /* Block SIGTERM here and unblock in child after fork resets the
518 set of pending signals */
519 if (interactive_shell)
520 {
521 sigemptyset (&set);
522 sigaddset (&set, SIGTERM);
523 sigemptyset (&oset);
524 sigprocmask (SIG_BLOCK, &set, &oset);
525 set_signal_handler (SIGTERM, SIG_DFL);
526 }
527
528 /* Create the child, handle severe errors. Retry on EAGAIN. */
529 forksleep = 1;
530 while ((pid = fork ()) < 0 && errno == EAGAIN && forksleep < FORKSLEEP_MAX)
531 {
532 sys_error ("fork: retry");
533
534 #if defined (HAVE_WAITPID)
535 /* Posix systems with a non-blocking waitpid () system call available
536 get another chance after zombies are reaped. */
537 reap_zombie_children ();
538 if (forksleep > 1 && sleep (forksleep) != 0)
539 break;
540 #else
541 if (sleep (forksleep) != 0)
542 break;
543 #endif /* HAVE_WAITPID */
544 forksleep <<= 1;
545 }
546
547 if (pid != 0)
548 if (interactive_shell)
549 {
550 set_signal_handler (SIGTERM, SIG_IGN);
551 sigprocmask (SIG_SETMASK, &oset, (sigset_t *)NULL);
552 }
553
554 if (pid < 0)
555 {
556 sys_error ("fork");
557 last_command_exit_value = EX_NOEXEC;
558 throw_to_top_level ();
559 }
560
561 if (pid == 0)
562 {
563 #if defined (BUFFERED_INPUT)
564 unset_bash_input (0);
565 #endif /* BUFFERED_INPUT */
566
567 CLRINTERRUPT; /* XXX - children have their own interrupt state */
568
569 /* Restore top-level signal mask. */
570 restore_sigmask ();
571
572 #if 0
573 /* Ignore INT and QUIT in asynchronous children. */
574 if (async_p)
575 last_asynchronous_pid = getpid ();
576 #endif
577
578 subshell_environment |= SUBSHELL_IGNTRAP;
579
580 default_tty_job_signals ();
581 }
582 else
583 {
584 /* In the parent. */
585
586 last_made_pid = pid;
587
588 if (async_p)
589 last_asynchronous_pid = pid;
590
591 add_pid (pid, async_p);
592 }
593 return (pid);
594 }
595
596 void
ignore_tty_job_signals()597 ignore_tty_job_signals ()
598 {
599 #if defined (SIGTSTP)
600 set_signal_handler (SIGTSTP, SIG_IGN);
601 set_signal_handler (SIGTTIN, SIG_IGN);
602 set_signal_handler (SIGTTOU, SIG_IGN);
603 #endif
604 }
605
606 void
default_tty_job_signals()607 default_tty_job_signals ()
608 {
609 #if defined (SIGTSTP)
610 if (signal_is_trapped (SIGTSTP) == 0 && signal_is_hard_ignored (SIGTSTP))
611 set_signal_handler (SIGTSTP, SIG_IGN);
612 else
613 set_signal_handler (SIGTSTP, SIG_DFL);
614 if (signal_is_trapped (SIGTTIN) == 0 && signal_is_hard_ignored (SIGTTIN))
615 set_signal_handler (SIGTTIN, SIG_IGN);
616 else
617 set_signal_handler (SIGTTIN, SIG_DFL);
618 if (signal_is_trapped (SIGTTOU) == 0 && signal_is_hard_ignored (SIGTTOU))
619 set_signal_handler (SIGTTOU, SIG_IGN);
620 else
621 set_signal_handler (SIGTTOU, SIG_DFL);
622 #endif
623 }
624
625 /* Called once in a parent process. */
626 void
get_original_tty_job_signals()627 get_original_tty_job_signals ()
628 {
629 static int fetched = 0;
630
631 if (fetched == 0)
632 {
633 #if defined (SIGTSTP)
634 if (interactive_shell)
635 {
636 set_original_signal (SIGTSTP, SIG_DFL);
637 set_original_signal (SIGTTIN, SIG_DFL);
638 set_original_signal (SIGTTOU, SIG_DFL);
639 }
640 else
641 {
642 get_original_signal (SIGTSTP);
643 get_original_signal (SIGTTIN);
644 get_original_signal (SIGTTOU);
645 }
646 #endif
647 fetched = 1;
648 }
649 }
650
651 /* Wait for a single pid (PID) and return its exit status. Called by
652 the wait builtin. */
653 int
wait_for_single_pid(pid,flags)654 wait_for_single_pid (pid, flags)
655 pid_t pid;
656 int flags;
657 {
658 pid_t got_pid;
659 WAIT status;
660 int pstatus;
661
662 pstatus = find_status_by_pid (pid);
663
664 if (pstatus == PROC_BAD)
665 {
666 internal_error (_("wait: pid %ld is not a child of this shell"), (long)pid);
667 return (127);
668 }
669
670 if (pstatus != PROC_STILL_ALIVE)
671 {
672 if (pstatus > 128)
673 last_command_exit_signal = find_termsig_by_pid (pid);
674 return (pstatus);
675 }
676
677 siginterrupt (SIGINT, 1);
678 while ((got_pid = WAITPID (pid, &status, 0)) != pid)
679 {
680 CHECK_TERMSIG;
681 CHECK_WAIT_INTR;
682 if (got_pid < 0)
683 {
684 if (errno != EINTR && errno != ECHILD)
685 {
686 siginterrupt (SIGINT, 0);
687 sys_error ("wait");
688 }
689 break;
690 }
691 else if (got_pid > 0)
692 set_pid_status (got_pid, status);
693 }
694
695 if (got_pid > 0)
696 {
697 set_pid_status (got_pid, status);
698 set_pid_flags (got_pid, PROC_NOTIFIED);
699 }
700
701 siginterrupt (SIGINT, 0);
702 QUIT;
703 CHECK_WAIT_INTR;
704
705 return (got_pid > 0 ? process_exit_status (status) : -1);
706 }
707
708 /* Wait for all of the shell's children to exit. Called by the `wait'
709 builtin. */
710 void
wait_for_background_pids(ps)711 wait_for_background_pids (ps)
712 struct procstat *ps;
713 {
714 pid_t got_pid;
715 WAIT status;
716
717 /* If we aren't using job control, we let the kernel take care of the
718 bookkeeping for us. wait () will return -1 and set errno to ECHILD
719 when there are no more unwaited-for child processes on both
720 4.2 BSD-based and System V-based systems. */
721
722 siginterrupt (SIGINT, 1);
723
724 /* Wait for ECHILD */
725 waiting_for_child = 1;
726 while ((got_pid = WAITPID (-1, &status, 0)) != -1)
727 {
728 waiting_for_child = 0;
729 set_pid_status (got_pid, status);
730 if (ps)
731 {
732 ps->pid = got_pid;
733 ps->status = process_exit_status (status);
734 }
735 waiting_for_child = 1;
736 CHECK_WAIT_INTR;
737 }
738 waiting_for_child = 0;
739
740 if (errno != EINTR && errno != ECHILD)
741 {
742 siginterrupt (SIGINT, 0);
743 sys_error("wait");
744 }
745
746 siginterrupt (SIGINT, 0);
747 QUIT;
748 CHECK_WAIT_INTR;
749
750 mark_dead_jobs_as_notified (1);
751 cleanup_dead_jobs ();
752 }
753
754 void
wait_sigint_cleanup()755 wait_sigint_cleanup ()
756 {
757 }
758
759 /* Make OLD_SIGINT_HANDLER the SIGINT signal handler. */
760 #define INVALID_SIGNAL_HANDLER (SigHandler *)wait_for_background_pids
761 static SigHandler *old_sigint_handler = INVALID_SIGNAL_HANDLER;
762
763 static void
restore_sigint_handler()764 restore_sigint_handler ()
765 {
766 if (old_sigint_handler != INVALID_SIGNAL_HANDLER)
767 {
768 set_signal_handler (SIGINT, old_sigint_handler);
769 old_sigint_handler = INVALID_SIGNAL_HANDLER;
770 }
771 }
772
773 /* Handle SIGINT while we are waiting for children in a script to exit.
774 All interrupts are effectively ignored by the shell, but allowed to
775 kill a running job. */
776 static sighandler
wait_sigint_handler(sig)777 wait_sigint_handler (sig)
778 int sig;
779 {
780 SigHandler *sigint_handler;
781
782 /* If we got a SIGINT while in `wait', and SIGINT is trapped, do
783 what POSIX.2 says (see builtins/wait.def for more info). */
784 if (this_shell_builtin && this_shell_builtin == wait_builtin &&
785 signal_is_trapped (SIGINT) &&
786 ((sigint_handler = trap_to_sighandler (SIGINT)) == trap_handler))
787 {
788 last_command_exit_value = 128+SIGINT;
789 restore_sigint_handler ();
790 trap_handler (SIGINT); /* set pending_traps[SIGINT] */
791 wait_signal_received = SIGINT;
792 SIGRETURN (0);
793 }
794
795 wait_sigint_received = 1;
796
797 SIGRETURN (0);
798 }
799
800 static char *
j_strsignal(s)801 j_strsignal (s)
802 int s;
803 {
804 static char retcode_name_buffer[64] = { '\0' };
805 char *x;
806
807 x = strsignal (s);
808 if (x == 0)
809 {
810 x = retcode_name_buffer;
811 sprintf (x, "Signal %d", s);
812 }
813 return x;
814 }
815
816 /* Wait for pid (one of our children) to terminate. This is called only
817 by the execution code in execute_cmd.c. */
818 int
wait_for(pid,flags)819 wait_for (pid, flags)
820 pid_t pid;
821 int flags;
822 {
823 int return_val, pstatus;
824 pid_t got_pid;
825 WAIT status;
826
827 pstatus = find_status_by_pid (pid);
828
829 if (pstatus == PROC_BAD)
830 return (0);
831
832 if (pstatus != PROC_STILL_ALIVE)
833 {
834 if (pstatus > 128)
835 last_command_exit_signal = find_termsig_by_pid (pid);
836 return (pstatus);
837 }
838
839 /* If we are running a script, ignore SIGINT while we're waiting for
840 a child to exit. The loop below does some of this, but not all. */
841 wait_sigint_received = 0;
842 if (interactive_shell == 0)
843 old_sigint_handler = set_signal_handler (SIGINT, wait_sigint_handler);
844
845 waiting_for_child = 1;
846 CHECK_WAIT_INTR;
847 while ((got_pid = WAITPID (-1, &status, 0)) != pid) /* XXX was pid now -1 */
848 {
849 waiting_for_child = 0;
850 CHECK_TERMSIG;
851 CHECK_WAIT_INTR;
852 if (got_pid < 0 && errno == ECHILD)
853 {
854 #if !defined (_POSIX_VERSION)
855 status.w_termsig = status.w_retcode = 0;
856 #else
857 status = 0;
858 #endif /* _POSIX_VERSION */
859 break;
860 }
861 else if (got_pid < 0 && errno != EINTR)
862 programming_error ("wait_for(%ld): %s", (long)pid, strerror(errno));
863 else if (got_pid > 0)
864 set_pid_status (got_pid, status);
865 waiting_for_child = 1;
866 }
867 waiting_for_child = 0;
868
869 if (got_pid > 0)
870 set_pid_status (got_pid, status);
871
872 #if defined (HAVE_WAITPID)
873 if (got_pid >= 0)
874 reap_zombie_children ();
875 #endif /* HAVE_WAITPID */
876
877 CHECK_TERMSIG;
878 CHECK_WAIT_INTR;
879
880 if (interactive_shell == 0)
881 {
882 SigHandler *temp_handler;
883
884 temp_handler = old_sigint_handler;
885 restore_sigint_handler ();
886
887 /* If the job exited because of SIGINT, make sure the shell acts as if
888 it had received one also. */
889 if (WIFSIGNALED (status) && (WTERMSIG (status) == SIGINT))
890 {
891
892 if (maybe_call_trap_handler (SIGINT) == 0)
893 {
894 if (temp_handler == SIG_DFL)
895 termsig_handler (SIGINT);
896 else if (temp_handler != INVALID_SIGNAL_HANDLER && temp_handler != SIG_IGN)
897 (*temp_handler) (SIGINT);
898 }
899 }
900 }
901
902 /* Default return value. */
903 /* ``a full 8 bits of status is returned'' */
904 return_val = process_exit_status (status);
905 last_command_exit_signal = get_termsig (status);
906
907 #if defined (DONT_REPORT_SIGPIPE) && defined (DONT_REPORT_SIGTERM)
908 # define REPORTSIG(x) ((x) != SIGINT && (x) != SIGPIPE && (x) != SIGTERM)
909 #elif !defined (DONT_REPORT_SIGPIPE) && !defined (DONT_REPORT_SIGTERM)
910 # define REPORTSIG(x) ((x) != SIGINT)
911 #elif defined (DONT_REPORT_SIGPIPE)
912 # define REPORTSIG(x) ((x) != SIGINT && (x) != SIGPIPE)
913 #else
914 # define REPORTSIG(x) ((x) != SIGINT && (x) != SIGTERM)
915 #endif
916
917 if ((WIFSTOPPED (status) == 0) && WIFSIGNALED (status) && REPORTSIG(WTERMSIG (status)))
918 {
919 fprintf (stderr, "%s", j_strsignal (WTERMSIG (status)));
920 if (WIFCORED (status))
921 fprintf (stderr, _(" (core dumped)"));
922 fprintf (stderr, "\n");
923 }
924
925 if (interactive_shell && subshell_environment == 0)
926 {
927 if (WIFSIGNALED (status) || WIFSTOPPED (status))
928 set_tty_state ();
929 else
930 get_tty_state ();
931 }
932 else if (interactive_shell == 0 && subshell_environment == 0 && check_window_size)
933 get_new_window_size (0, (int *)0, (int *)0);
934
935 return (return_val);
936 }
937
938 /* Send PID SIGNAL. Returns -1 on failure, 0 on success. If GROUP is non-zero,
939 or PID is less than -1, then kill the process group associated with PID. */
940 int
kill_pid(pid,signal,group)941 kill_pid (pid, signal, group)
942 pid_t pid;
943 int signal, group;
944 {
945 int result;
946
947 if (pid < -1)
948 {
949 pid = -pid;
950 group = 1;
951 }
952 result = group ? killpg (pid, signal) : kill (pid, signal);
953 return (result);
954 }
955
956 static TTYSTRUCT shell_tty_info;
957 static int got_tty_state;
958
959 /* Fill the contents of shell_tty_info with the current tty info. */
960 int
get_tty_state()961 get_tty_state ()
962 {
963 int tty;
964
965 tty = input_tty ();
966 if (tty != -1)
967 {
968 ttgetattr (tty, &shell_tty_info);
969 got_tty_state = 1;
970 if (check_window_size)
971 get_new_window_size (0, (int *)0, (int *)0);
972 }
973 return 0;
974 }
975
976 /* Make the current tty use the state in shell_tty_info. */
977 int
set_tty_state()978 set_tty_state ()
979 {
980 int tty;
981
982 tty = input_tty ();
983 if (tty != -1)
984 {
985 if (got_tty_state == 0)
986 return 0;
987 ttsetattr (tty, &shell_tty_info);
988 }
989 return 0;
990 }
991
992 /* Give the terminal to PGRP. */
993 int
give_terminal_to(pgrp,force)994 give_terminal_to (pgrp, force)
995 pid_t pgrp;
996 int force;
997 {
998 return 0;
999 }
1000
1001 /* Stop a pipeline. */
1002 int
stop_pipeline(async,ignore)1003 stop_pipeline (async, ignore)
1004 int async;
1005 COMMAND *ignore;
1006 {
1007 already_making_children = 0;
1008 return 0;
1009 }
1010
1011 void
start_pipeline()1012 start_pipeline ()
1013 {
1014 already_making_children = 1;
1015 }
1016
1017 void
stop_making_children()1018 stop_making_children ()
1019 {
1020 already_making_children = 0;
1021 }
1022
1023 /* The name is kind of a misnomer, but it's what the job control code uses. */
1024 void
without_job_control()1025 without_job_control ()
1026 {
1027 stop_making_children ();
1028 last_made_pid = NO_PID; /* XXX */
1029 }
1030
1031 int
get_job_by_pid(pid,block,ignore)1032 get_job_by_pid (pid, block, ignore)
1033 pid_t pid;
1034 int block;
1035 PROCESS **ignore;
1036 {
1037 int i;
1038
1039 i = find_index_by_pid (pid);
1040 return ((i == NO_PID) ? PROC_BAD : i);
1041 }
1042
1043 /* Print descriptive information about the job with leader pid PID. */
1044 void
describe_pid(pid)1045 describe_pid (pid)
1046 pid_t pid;
1047 {
1048 fprintf (stderr, "%ld\n", (long) pid);
1049 }
1050
1051 int
freeze_jobs_list()1052 freeze_jobs_list ()
1053 {
1054 return 0;
1055 }
1056
1057 void
unfreeze_jobs_list()1058 unfreeze_jobs_list ()
1059 {
1060 }
1061
1062 void
set_jobs_list_frozen(s)1063 set_jobs_list_frozen (s)
1064 int s;
1065 {
1066 }
1067
1068 int
count_all_jobs()1069 count_all_jobs ()
1070 {
1071 return 0;
1072 }
1073