1 /* The thing that makes children, remembers them, and contains wait loops. */
3 /* This file works with both POSIX and BSD systems. It implements job
6 /* Copyright (C) 1989-2005 Free Software Foundation, Inc.
8 This file is part of GNU Bash, the Bourne Again SHell.
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
12 Software Foundation; either version 2, or (at your option) any later
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
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
22 Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
26 #include "bashtypes.h"
32 #if defined (HAVE_UNISTD_H)
36 #include "posixtime.h"
38 #if defined (HAVE_SYS_RESOURCE_H) && defined (HAVE_WAIT3) && !defined (_POSIX_VERSION) && !defined (RLIMTYPE)
39 # include <sys/resource.h>
40 #endif /* !_POSIX_VERSION && HAVE_SYS_RESOURCE_H && HAVE_WAIT3 && !RLIMTYPE */
42 #if defined (HAVE_SYS_FILE_H)
43 # include <sys/file.h>
47 #include <sys/ioctl.h>
48 #include <sys/param.h>
50 #if defined (BUFFERED_INPUT)
54 /* Need to include this up here for *_TTY_DRIVER definitions. */
57 /* Define this if your output is getting swallowed. It's a no-op on
58 machines with the termio or termios tty drivers. */
59 /* #define DRAIN_OUTPUT */
61 /* For the TIOCGPGRP and TIOCSPGRP ioctl parameters on HP-UX */
62 #if defined (hpux) && !defined (TERMIOS_TTY_DRIVER)
64 #endif /* hpux && !TERMIOS_TTY_DRIVER */
66 #if !defined (STRUCT_WINSIZE_IN_SYS_IOCTL)
67 /* For struct winsize on SCO */
68 /* sys/ptem.h has winsize but needs mblk_t from sys/stream.h */
69 # if defined (HAVE_SYS_PTEM_H) && defined (TIOCGWINSZ) && defined (SIGWINCH)
70 # if defined (HAVE_SYS_STREAM_H)
71 # include <sys/stream.h>
73 # include <sys/ptem.h>
74 # endif /* HAVE_SYS_PTEM_H && TIOCGWINSZ && SIGWINCH */
75 #endif /* !STRUCT_WINSIZE_IN_SYS_IOCTL */
83 #include "builtins/builtext.h"
84 #include "builtins/common.h"
90 #define DEFAULT_CHILD_MAX 32
91 #define MAX_JOBS_IN_ARRAY 4096 /* testing */
93 /* Take care of system dependencies that must be handled when waiting for
94 children. The arguments to the WAITPID macro match those to the Posix.1
95 waitpid() function. */
97 #if defined (ultrix) && defined (mips) && defined (_POSIX_VERSION)
98 # define WAITPID(pid, statusp, options) \
99 wait3 ((union wait *)statusp, options, (struct rusage *)0)
101 # if defined (_POSIX_VERSION) || defined (HAVE_WAITPID)
102 # define WAITPID(pid, statusp, options) \
103 waitpid ((pid_t)pid, statusp, options)
105 # if defined (HAVE_WAIT3)
106 # define WAITPID(pid, statusp, options) \
107 wait3 (statusp, options, (struct rusage *)0)
109 # define WAITPID(pid, statusp, options) \
110 wait3 (statusp, options, (int *)0)
111 # endif /* HAVE_WAIT3 */
112 # endif /* !_POSIX_VERSION && !HAVE_WAITPID*/
113 #endif /* !(Ultrix && mips && _POSIX_VERSION) */
115 /* getpgrp () varies between systems. Even systems that claim to be
116 Posix.1 compatible lie sometimes (Ultrix, SunOS4, apollo). */
117 #if defined (GETPGRP_VOID)
118 # define getpgid(p) getpgrp ()
120 # define getpgid(p) getpgrp (p)
121 #endif /* !GETPGRP_VOID */
123 /* If the system needs it, REINSTALL_SIGCHLD_HANDLER will reinstall the
124 handler for SIGCHLD. */
125 #if defined (MUST_REINSTALL_SIGHANDLERS)
126 # define REINSTALL_SIGCHLD_HANDLER signal (SIGCHLD, sigchld_handler)
128 # define REINSTALL_SIGCHLD_HANDLER
129 #endif /* !MUST_REINSTALL_SIGHANDLERS */
131 /* Some systems let waitpid(2) tell callers about stopped children. */
132 #if !defined (WCONTINUED) || defined (WCONTINUED_BROKEN)
134 # define WCONTINUED 0
136 #if !defined (WIFCONTINUED)
137 # define WIFCONTINUED(s) (0)
140 /* The number of additional slots to allocate when we run out. */
143 typedef int sh_job_map_func_t __P((JOB *, int, int, int));
145 #if defined (READLINE)
146 extern void rl_set_screen_size __P((int, int));
149 /* Variables used here but defined in other files. */
150 extern int subshell_environment, line_number;
151 extern int posixly_correct, shell_level;
152 extern int interrupt_immediately;
153 extern int last_command_exit_value, last_command_exit_signal;
154 extern int loop_level, breaking;
155 extern int sourcelevel;
156 extern sh_builtin_func_t *this_shell_builtin;
157 extern char *shell_name, *this_command_name;
158 extern sigset_t top_level_mask;
159 extern procenv_t wait_intr_buf;
160 extern int wait_signal_received;
161 extern WORD_LIST *subst_assign_varlist;
163 struct jobstats js = { -1L, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, NO_JOB, NO_JOB, 0, 0 };
165 struct bgpids bgpids = { 0, 0, 0 };
167 /* The array of known jobs. */
168 JOB **jobs = (JOB **)NULL;
171 /* The number of slots currently allocated to JOBS. */
175 /* The controlling tty for this shell. */
178 /* The shell's process group. */
179 pid_t shell_pgrp = NO_PID;
181 /* The terminal's process group. */
182 pid_t terminal_pgrp = NO_PID;
184 /* The process group of the shell's parent. */
185 pid_t original_pgrp = NO_PID;
187 /* The process group of the pipeline currently being made. */
188 pid_t pipeline_pgrp = (pid_t)0;
190 #if defined (PGRP_PIPE)
191 /* Pipes which each shell uses to communicate with the process group leader
192 until all of the processes in a pipeline have been started. Then the
193 process leader is allowed to continue. */
194 int pgrp_pipe[2] = { -1, -1 };
198 /* The job which is current; i.e. the one that `%+' stands for. */
199 int current_job = NO_JOB;
201 /* The previous job; i.e. the one that `%-' stands for. */
202 int previous_job = NO_JOB;
205 /* Last child made by the shell. */
206 pid_t last_made_pid = NO_PID;
208 /* Pid of the last asynchronous child. */
209 pid_t last_asynchronous_pid = NO_PID;
211 /* The pipeline currently being built. */
212 PROCESS *the_pipeline = (PROCESS *)NULL;
214 /* If this is non-zero, do job control. */
217 /* Call this when you start making children. */
218 int already_making_children = 0;
220 /* If this is non-zero, $LINES and $COLUMNS are reset after every process
221 exits from get_tty_state(). */
222 int check_window_size;
224 /* Functions local to this file. */
226 static void get_new_window_size __P((int));
228 static void run_sigchld_trap __P((int));
230 static sighandler wait_sigint_handler __P((int));
231 static sighandler sigchld_handler __P((int));
232 static sighandler sigwinch_sighandler __P((int));
233 static sighandler sigcont_sighandler __P((int));
234 static sighandler sigstop_sighandler __P((int));
236 static int waitchld __P((pid_t, int));
238 static PROCESS *find_pipeline __P((pid_t, int, int *));
239 static PROCESS *find_process __P((pid_t, int, int *));
241 static char *current_working_directory __P((void));
242 static char *job_working_directory __P((void));
243 static char *j_strsignal __P((int));
244 static char *printable_job_status __P((int, PROCESS *, int));
246 static PROCESS *find_last_proc __P((int, int));
247 static pid_t find_last_pid __P((int, int));
249 static int set_new_line_discipline __P((int));
250 static int map_over_jobs __P((sh_job_map_func_t *, int, int));
251 static int job_last_stopped __P((int));
252 static int job_last_running __P((int));
253 static int most_recent_job_in_state __P((int, JOB_STATE));
254 static int find_job __P((pid_t, int, PROCESS **));
255 static int print_job __P((JOB *, int, int, int));
256 static int process_exit_status __P((WAIT));
257 static int process_exit_signal __P((WAIT));
258 static int job_exit_status __P((int));
259 static int job_exit_signal __P((int));
260 static int set_job_status_and_cleanup __P((int));
262 static WAIT raw_job_exit_status __P((int));
264 static void notify_of_job_status __P((void));
265 static void reset_job_indices __P((void));
266 static void cleanup_dead_jobs __P((void));
267 static int processes_in_job __P((int));
268 static void realloc_jobs_list __P((void));
269 static int compact_jobs_list __P((int));
270 static int discard_pipeline __P((PROCESS *));
271 static void add_process __P((char *, pid_t));
272 static void print_pipeline __P((PROCESS *, int, int, FILE *));
273 static void pretty_print_job __P((int, int, FILE *));
274 static void set_current_job __P((int));
275 static void reset_current __P((void));
276 static void set_job_running __P((int));
277 static void setjstatus __P((int));
278 static void mark_all_jobs_as_dead __P((void));
279 static void mark_dead_jobs_as_notified __P((int));
280 static void restore_sigint_handler __P((void));
281 #if defined (PGRP_PIPE)
282 static void pipe_read __P((int *));
283 static void pipe_close __P((int *));
286 static struct pidstat *bgp_alloc __P((pid_t, int));
287 static struct pidstat *bgp_add __P((pid_t, int));
288 static int bgp_delete __P((pid_t));
289 static void bgp_clear __P((void));
290 static int bgp_search __P((pid_t));
291 static void bgp_prune __P((void));
293 #if defined (ARRAY_VARS)
294 static int *pstatuses; /* list of pipeline statuses */
298 /* Used to synchronize between wait_for and other functions and the SIGCHLD
301 static int queue_sigchld;
303 #define QUEUE_SIGCHLD(os) (os) = sigchld, queue_sigchld++
305 #define UNQUEUE_SIGCHLD(os) \
308 if (queue_sigchld == 0 && os != sigchld) \
312 static SigHandler *old_tstp, *old_ttou, *old_ttin;
313 static SigHandler *old_cont = (SigHandler *)SIG_DFL;
315 #if defined (TIOCGWINSZ) && defined (SIGWINCH)
316 static SigHandler *old_winch = (SigHandler *)SIG_DFL;
319 /* A place to temporarily save the current pipeline. */
320 static PROCESS *saved_pipeline;
321 static int saved_already_making_children;
323 /* Set this to non-zero whenever you don't want the jobs list to change at
324 all: no jobs deleted and no status change notifications. This is used,
325 for example, when executing SIGCHLD traps, which may run arbitrary
327 static int jobs_list_frozen;
329 static char retcode_name_buffer[64];
331 #if !defined (_POSIX_VERSION)
333 /* These are definitions to map POSIX 1003.1 functions onto existing BSD
334 library functions and system calls. */
335 #define setpgid(pid, pgrp) setpgrp (pid, pgrp)
336 #define tcsetpgrp(fd, pgrp) ioctl ((fd), TIOCSPGRP, &(pgrp))
344 /* ioctl will handle setting errno correctly. */
345 if (ioctl (fd, TIOCGPGRP, &pgrp) < 0)
350 #endif /* !_POSIX_VERSION */
352 /* Return the working directory for the current process. Unlike
353 job_working_directory, this does not call malloc (), nor do any
354 of the functions it calls. This is so that it can safely be called
355 from a signal handler. */
357 current_working_directory ()
360 static char d[PATH_MAX];
362 dir = get_string_value ("PWD");
364 if (dir == 0 && the_current_working_directory && no_symbolic_links)
365 dir = the_current_working_directory;
369 dir = getcwd (d, sizeof(d));
374 return (dir == 0) ? "<unknown>" : dir;
377 /* Return the working directory for the current process. */
379 job_working_directory ()
383 dir = get_string_value ("PWD");
385 return (savestring (dir));
387 dir = get_working_directory ("job-working-directory");
391 return (savestring ("<unknown>"));
397 if (already_making_children)
400 already_making_children = 1;
405 stop_making_children ()
407 already_making_children = 0;
411 cleanup_the_pipeline ()
415 discard_pipeline (the_pipeline);
416 the_pipeline = (PROCESS *)NULL;
421 save_pipeline (clear)
424 saved_pipeline = the_pipeline;
425 saved_already_making_children = already_making_children;
427 the_pipeline = (PROCESS *)NULL;
431 restore_pipeline (discard)
434 PROCESS *old_pipeline;
436 old_pipeline = the_pipeline;
437 the_pipeline = saved_pipeline;
438 already_making_children = saved_already_making_children;
440 discard_pipeline (old_pipeline);
443 /* Start building a pipeline. */
449 cleanup_the_pipeline ();
451 #if defined (PGRP_PIPE)
452 pipe_close (pgrp_pipe);
456 #if defined (PGRP_PIPE)
459 if (pipe (pgrp_pipe) == -1)
460 sys_error ("start_pipeline: pgrp pipe");
465 /* Stop building a pipeline. Install the process list in the job array.
466 This returns the index of the newly installed job.
467 DEFERRED is a command structure to be executed upon satisfactory
468 execution exit of this pipeline. */
470 stop_pipeline (async, deferred)
478 BLOCK_CHILD (set, oset);
480 #if defined (PGRP_PIPE)
481 /* The parent closes the process group synchronization pipe. */
482 pipe_close (pgrp_pipe);
485 cleanup_dead_jobs ();
487 if (js.j_jobslots == 0)
489 js.j_jobslots = JOB_SLOTS;
490 jobs = (JOB **)xmalloc (js.j_jobslots * sizeof (JOB *));
492 /* Now blank out these new entries. */
493 for (i = 0; i < js.j_jobslots; i++)
494 jobs[i] = (JOB *)NULL;
496 js.j_firstj = js.j_lastj = js.j_njobs = 0;
499 /* Scan from the last slot backward, looking for the next free one. */
500 /* XXX - revisit this interactive assumption */
501 /* XXX - this way for now */
504 for (i = js.j_jobslots; i; i--)
511 /* This wraps around, but makes it inconvenient to extend the array */
512 for (i = js.j_lastj+1; i != js.j_lastj; i++)
514 if (i >= js.j_jobslots)
522 /* This doesn't wrap around yet. */
523 for (i = js.j_lastj ? js.j_lastj + 1 : js.j_lastj; i < js.j_jobslots; i++)
529 /* Do we need more room? */
531 /* First try compaction */
532 if ((interactive_shell == 0 || subshell_environment) && i == js.j_jobslots && js.j_jobslots >= MAX_JOBS_IN_ARRAY)
533 i = compact_jobs_list (0);
535 /* If we can't compact, reallocate */
536 if (i == js.j_jobslots)
538 js.j_jobslots += JOB_SLOTS;
539 jobs = (JOB **)xrealloc (jobs, (js.j_jobslots * sizeof (JOB *)));
541 for (j = i; j < js.j_jobslots; j++)
542 jobs[j] = (JOB *)NULL;
545 /* Add the current pipeline to the job list. */
549 int any_running, any_stopped, n;
551 newjob = (JOB *)xmalloc (sizeof (JOB));
553 for (n = 1, p = the_pipeline; p->next != the_pipeline; n++, p = p->next)
555 p->next = (PROCESS *)NULL;
556 newjob->pipe = REVERSE_LIST (the_pipeline, PROCESS *);
557 for (p = newjob->pipe; p->next; p = p->next)
559 p->next = newjob->pipe;
561 the_pipeline = (PROCESS *)NULL;
562 newjob->pgrp = pipeline_pgrp;
567 /* Flag to see if in another pgrp. */
569 newjob->flags |= J_JOBCONTROL;
571 /* Set the state of this pipeline. */
573 any_running = any_stopped = 0;
576 any_running |= PRUNNING (p);
577 any_stopped |= PSTOPPED (p);
580 while (p != newjob->pipe);
582 newjob->state = any_running ? JRUNNING : (any_stopped ? JSTOPPED : JDEAD);
583 newjob->wd = job_working_directory ();
584 newjob->deferred = deferred;
586 newjob->j_cleanup = (sh_vptrfunc_t *)NULL;
587 newjob->cleanarg = (PTR_T) NULL;
590 if (newjob->state == JDEAD && (newjob->flags & J_FOREGROUND))
592 if (newjob->state == JDEAD)
594 js.c_reaped += n; /* wouldn't have been done since this was not part of a job */
603 newjob = (JOB *)NULL;
606 js.j_lastmade = newjob;
612 newjob->flags &= ~J_FOREGROUND;
613 newjob->flags |= J_ASYNC;
614 js.j_lastasync = newjob;
622 newjob->flags |= J_FOREGROUND;
624 * !!!!! NOTE !!!!! (chet@ins.cwru.edu)
626 * The currently-accepted job control wisdom says to set the
627 * terminal's process group n+1 times in an n-step pipeline:
628 * once in the parent and once in each child. This is where
629 * the parent gives it away.
632 if (job_control && newjob->pgrp)
633 give_terminal_to (newjob->pgrp, 0);
637 stop_making_children ();
638 UNBLOCK_CHILD (oset);
639 return (js.j_current);
642 /* Functions to manage the list of exited background pids whose status has
645 static struct pidstat *
646 bgp_alloc (pid, status)
652 ps = (struct pidstat *)xmalloc (sizeof (struct pidstat));
655 ps->next = (struct pidstat *)0;
659 static struct pidstat *
660 bgp_add (pid, status)
666 ps = bgp_alloc (pid, status);
668 if (bgpids.list == 0)
670 bgpids.list = bgpids.end = ps;
671 bgpids.npid = 0; /* just to make sure */
675 bgpids.end->next = ps;
680 if (bgpids.npid > js.c_childmax)
690 struct pidstat *prev, *p;
692 for (prev = p = bgpids.list; p; prev = p, p = p->next)
695 prev->next = p->next; /* remove from list */
700 return 0; /* not found */
703 itrace("bgp_delete: deleting %d", pid);
706 /* Housekeeping in the border cases. */
707 if (p == bgpids.list)
708 bgpids.list = bgpids.list->next;
709 else if (p == bgpids.end)
713 if (bgpids.npid == 0)
714 bgpids.list = bgpids.end = 0;
715 else if (bgpids.npid == 1)
716 bgpids.end = bgpids.list; /* just to make sure */
722 /* Clear out the list of saved statuses */
726 struct pidstat *ps, *p;
728 for (ps = bgpids.list; ps; )
734 bgpids.list = bgpids.end = 0;
738 /* Search for PID in the list of saved background pids; return its status if
739 found. If not found, return -1. */
746 for (ps = bgpids.list ; ps; ps = ps->next)
755 struct pidstat *ps, *p;
757 while (bgpids.npid > js.c_childmax)
760 bgpids.list = bgpids.list->next;
766 /* Reset the values of js.j_lastj and js.j_firstj after one or both have
767 been deleted. The caller should check whether js.j_njobs is 0 before
768 calling this. This wraps around, but the rest of the code does not. At
769 this point, it should not matter. */
775 if (jobs[js.j_firstj] == 0)
778 while (js.j_firstj != old)
780 if (js.j_firstj >= js.j_jobslots)
782 if (jobs[js.j_firstj])
786 if (js.j_firstj == old)
787 js.j_firstj = js.j_lastj = js.j_njobs = 0;
789 if (jobs[js.j_lastj] == 0)
792 while (js.j_lastj != old)
795 js.j_lastj = js.j_jobslots - 1;
796 if (jobs[js.j_lastj])
800 if (js.j_lastj == old)
801 js.j_firstj = js.j_lastj = js.j_njobs = 0;
805 /* Delete all DEAD jobs that the user had received notification about. */
812 if (js.j_jobslots == 0 || jobs_list_frozen)
817 /* XXX could use js.j_firstj here */
818 for (i = 0; i < js.j_jobslots; i++)
821 if (i < js.j_firstj && jobs[i])
822 itrace("cleanup_dead_jobs: job %d non-null before js.j_firstj (%d)", i, js.j_firstj);
825 if (jobs[i] && DEADJOB (i) && IS_NOTIFIED (i))
832 processes_in_job (job)
844 while (p != jobs[job]->pipe);
849 /* Reallocate and compress the jobs list. This returns with a jobs array
850 whose size is a multiple of JOB_SLOTS and can hold the current number of
851 jobs. Heuristics are used to minimize the number of new reallocs. */
859 nsize = ((js.j_njobs + JOB_SLOTS - 1) / JOB_SLOTS);
861 i = js.j_njobs % JOB_SLOTS;
862 if (i == 0 || i > (JOB_SLOTS >> 1))
865 BLOCK_CHILD (set, oset);
866 nlist = (JOB **) xmalloc (nsize * sizeof (JOB *));
867 for (i = j = 0; i < js.j_jobslots; i++)
869 nlist[j++] = jobs[i];
872 js.j_lastj = (j > 0) ? j - 1: 0;
873 js.j_jobslots = nsize;
878 UNBLOCK_CHILD (oset);
881 /* Compact the jobs list by removing dead jobs. Assumed that we have filled
882 the jobs array to some predefined maximum. Called when the shell is not
883 the foreground process (subshell_environment != 0). Returns the first
884 available slot in the compacted list. If that value is js.j_jobslots, then
885 the list needs to be reallocated. The jobs array is in new memory if
886 this returns > 0 and < js.j_jobslots. FLAGS is reserved for future use. */
888 compact_jobs_list (flags)
891 if (js.j_jobslots == 0 || jobs_list_frozen)
892 return js.j_jobslots;
895 realloc_jobs_list ();
900 /* Delete the job at INDEX from the job list. Must be called
901 with SIGCHLD blocked. */
903 delete_job (job_index, warn_stopped)
904 int job_index, warn_stopped;
911 if (js.j_jobslots == 0 || jobs_list_frozen)
914 if (warn_stopped && subshell_environment == 0 && STOPPED (job_index))
915 internal_warning (_("deleting stopped job %d with process group %ld"), job_index+1, (long)jobs[job_index]->pgrp);
916 temp = jobs[job_index];
917 if (job_index == js.j_current || job_index == js.j_previous)
920 proc = find_last_proc (job_index, 0);
921 /* Could do this just for J_ASYNC jobs, but we save all. */
922 bgp_add (proc->pid, process_exit_status (proc->status));
924 jobs[job_index] = (JOB *)NULL;
926 if (temp == js.j_lastmade)
928 else if (temp == js.j_lastasync)
932 ndel = discard_pipeline (temp->pipe);
935 if (temp->state == JDEAD)
942 itrace("delete_job (%d pgrp %d): js.c_reaped (%d) < 0 ndel = %d js.j_ndead = %d", job_index, temp->pgrp, js.c_reaped, ndel, js.j_ndead);
949 dispose_command (temp->deferred);
955 js.j_firstj = js.j_lastj = 0;
956 else if (jobs[js.j_firstj] == 0 || jobs[js.j_lastj] == 0)
957 reset_job_indices ();
960 /* Must be called with SIGCHLD blocked. */
962 nohup_job (job_index)
967 if (js.j_jobslots == 0)
970 if (temp = jobs[job_index])
971 temp->flags |= J_NOHUP;
974 /* Get rid of the data structure associated with a process chain. */
976 discard_pipeline (chain)
977 register PROCESS *chain;
979 register PROCESS *this, *next;
987 FREE (this->command);
992 while (this != chain);
997 /* Add this process to the chain being built in the_pipeline.
998 NAME is the command string that will be exec'ed later.
999 PID is the process id of the child. */
1001 add_process (name, pid)
1007 #if defined (RECYCLES_PIDS)
1009 p = find_process (pid, 0, &j);
1014 internal_warning ("add_process: process %5ld (%s) in the_pipeline", (long)p->pid, p->command);
1017 internal_warning ("add_process: pid %5ld (%s) marked as still alive", (long)p->pid, p->command);
1018 p->running = PS_RECYCLED; /* mark as recycled */
1022 t = (PROCESS *)xmalloc (sizeof (PROCESS));
1023 t->next = the_pipeline;
1025 WSTATUS (t->status) = 0;
1026 t->running = PS_RUNNING;
1035 while (p->next != t->next)
1042 /* Take the last job and make it the first job. Must be called with
1045 rotate_the_pipeline ()
1049 if (the_pipeline->next == the_pipeline)
1051 for (p = the_pipeline; p->next != the_pipeline; p = p->next)
1056 /* Reverse the order of the processes in the_pipeline. Must be called with
1059 reverse_the_pipeline ()
1063 if (the_pipeline->next == the_pipeline)
1066 for (p = the_pipeline; p->next != the_pipeline; p = p->next)
1068 p->next = (PROCESS *)NULL;
1070 n = REVERSE_LIST (the_pipeline, PROCESS *);
1073 for (p = the_pipeline; p->next; p = p->next)
1075 p->next = the_pipeline;
1079 /* Map FUNC over the list of jobs. If FUNC returns non-zero,
1080 then it is time to stop mapping, and that is the return value
1081 for map_over_jobs. FUNC is called with a JOB, arg1, arg2,
1084 map_over_jobs (func, arg1, arg2)
1085 sh_job_map_func_t *func;
1092 if (js.j_jobslots == 0)
1095 BLOCK_CHILD (set, oset);
1097 /* XXX could use js.j_firstj here */
1098 for (i = result = 0; i < js.j_jobslots; i++)
1101 if (i < js.j_firstj && jobs[i])
1102 itrace("map_over_jobs: job %d non-null before js.j_firstj (%d)", i, js.j_firstj);
1106 result = (*func)(jobs[i], arg1, arg2, i);
1112 UNBLOCK_CHILD (oset);
1117 /* Cause all the jobs in the current pipeline to exit. */
1119 terminate_current_pipeline ()
1121 if (pipeline_pgrp && pipeline_pgrp != shell_pgrp)
1123 killpg (pipeline_pgrp, SIGTERM);
1124 killpg (pipeline_pgrp, SIGCONT);
1128 /* Cause all stopped jobs to exit. */
1130 terminate_stopped_jobs ()
1134 /* XXX could use js.j_firstj here */
1135 for (i = 0; i < js.j_jobslots; i++)
1137 if (jobs[i] && STOPPED (i))
1139 killpg (jobs[i]->pgrp, SIGTERM);
1140 killpg (jobs[i]->pgrp, SIGCONT);
1145 /* Cause all jobs, running or stopped, to receive a hangup signal. If
1146 a job is marked J_NOHUP, don't send the SIGHUP. */
1152 /* XXX could use js.j_firstj here */
1153 for (i = 0; i < js.j_jobslots; i++)
1157 if ((jobs[i]->flags & J_NOHUP) == 0)
1158 killpg (jobs[i]->pgrp, SIGHUP);
1160 killpg (jobs[i]->pgrp, SIGCONT);
1166 kill_current_pipeline ()
1168 stop_making_children ();
1172 /* Return the pipeline that PID belongs to. Note that the pipeline
1173 doesn't have to belong to a job. Must be called with SIGCHLD blocked.
1174 If JOBP is non-null, return the index of the job containing PID. */
1176 find_pipeline (pid, alive_only, jobp)
1179 int *jobp; /* index into jobs list or NO_JOB */
1184 /* See if this process is in the pipeline that we are building. */
1192 /* Return it if we found it. Don't ever return a recycled pid. */
1193 if (p->pid == pid && ((alive_only == 0 && PRECYCLED(p) == 0) || PALIVE(p)))
1198 while (p != the_pipeline);
1201 job = find_job (pid, alive_only, &p);
1204 return (job == NO_JOB) ? (PROCESS *)NULL : jobs[job]->pipe;
1207 /* Return the PROCESS * describing PID. If JOBP is non-null return the index
1208 into the jobs array of the job containing PID. Must be called with
1211 find_process (pid, alive_only, jobp)
1214 int *jobp; /* index into jobs list or NO_JOB */
1218 p = find_pipeline (pid, alive_only, jobp);
1219 while (p && p->pid != pid)
1224 /* Return the job index that PID belongs to, or NO_JOB if it doesn't
1225 belong to any job. Must be called with SIGCHLD blocked. */
1227 find_job (pid, alive_only, procp)
1235 /* XXX could use js.j_firstj here */
1236 for (i = 0; i < js.j_jobslots; i++)
1239 if (i < js.j_firstj && jobs[i])
1240 itrace("find_job: job %d non-null before js.j_firstj (%d)", i, js.j_firstj);
1248 if (p->pid == pid && ((alive_only == 0 && PRECYCLED(p) == 0) || PALIVE(p)))
1257 while (p != jobs[i]->pipe);
1264 /* Find a job given a PID. If BLOCK is non-zero, block SIGCHLD as
1265 required by find_job. */
1267 get_job_by_pid (pid, block)
1275 BLOCK_CHILD (set, oset);
1277 job = find_job (pid, 0, NULL);
1280 UNBLOCK_CHILD (oset);
1285 /* Print descriptive information about the job with leader pid PID. */
1293 BLOCK_CHILD (set, oset);
1295 job = find_job (pid, 0, NULL);
1298 fprintf (stderr, "[%d] %ld\n", job + 1, (long)pid);
1300 programming_error (_("describe_pid: %ld: no such pid"), (long)pid);
1302 UNBLOCK_CHILD (oset);
1314 x = retcode_name_buffer;
1315 sprintf (x, "Signal %d", s);
1321 printable_job_status (j, p, format)
1331 if (STOPPED (j) && format == 0)
1333 if (posixly_correct == 0 || p == 0 || (WIFSTOPPED (p->status) == 0))
1337 temp = retcode_name_buffer;
1338 sprintf (temp, "Stopped(%s)", signal_name (WSTOPSIG (p->status)));
1341 else if (RUNNING (j))
1345 if (WIFSTOPPED (p->status))
1346 temp = j_strsignal (WSTOPSIG (p->status));
1347 else if (WIFSIGNALED (p->status))
1348 temp = j_strsignal (WTERMSIG (p->status));
1349 else if (WIFEXITED (p->status))
1351 temp = retcode_name_buffer;
1352 es = WEXITSTATUS (p->status);
1354 strcpy (temp, "Done");
1355 else if (posixly_correct)
1356 sprintf (temp, "Done(%d)", es);
1358 sprintf (temp, "Exit %d", es);
1361 temp = "Unknown status";
1367 /* This is the way to print out information on a job if you
1368 know the index. FORMAT is:
1370 JLIST_NORMAL) [1]+ Running emacs
1371 JLIST_LONG ) [1]+ 2378 Running emacs
1372 -1 ) [1]+ 2378 emacs
1374 JLIST_NORMAL) [1]+ Stopped ls | more
1375 JLIST_LONG ) [1]+ 2369 Stopped ls
1378 Just list the pid of the process group leader (really
1381 Use format JLIST_NORMAL, but list only jobs about which
1382 the user has not been notified. */
1384 /* Print status for pipeline P. If JOB_INDEX is >= 0, it is the index into
1385 the JOBS array corresponding to this pipeline. FORMAT is as described
1386 above. Must be called with SIGCHLD blocked.
1388 If you're printing a pipeline that's not in the jobs array, like the
1389 current pipeline as it's being created, pass -1 for JOB_INDEX */
1391 print_pipeline (p, job_index, format, stream)
1393 int job_index, format;
1396 PROCESS *first, *last, *show;
1397 int es, name_padding;
1404 while (last->next != first)
1410 fprintf (stream, format ? " " : " |");
1412 if (format != JLIST_STANDARD)
1413 fprintf (stream, "%5ld", (long)p->pid);
1415 fprintf (stream, " ");
1417 if (format > -1 && job_index >= 0)
1419 show = format ? p : last;
1420 temp = printable_job_status (job_index, show, format);
1426 if (show->running == first->running &&
1427 WSTATUS (show->status) == WSTATUS (first->status))
1431 temp = (char *)NULL;
1436 fprintf (stream, "%s", temp);
1440 es = 2; /* strlen ("| ") */
1441 name_padding = LONGEST_SIGNAL_DESC - es;
1443 fprintf (stream, "%*s", name_padding, "");
1445 if ((WIFSTOPPED (show->status) == 0) &&
1446 (WIFCONTINUED (show->status) == 0) &&
1447 WIFCORED (show->status))
1448 fprintf (stream, "(core dumped) ");
1452 if (p != first && format)
1453 fprintf (stream, "| ");
1456 fprintf (stream, "%s", p->command);
1458 if (p == last && job_index >= 0)
1460 temp = current_working_directory ();
1462 if (RUNNING (job_index) && (IS_FOREGROUND (job_index) == 0))
1463 fprintf (stream, " &");
1465 if (strcmp (temp, jobs[job_index]->wd) != 0)
1467 " (wd: %s)", polite_directory_format (jobs[job_index]->wd));
1470 if (format || (p == last))
1472 /* We need to add a CR only if this is an interactive shell, and
1473 we're reporting the status of a completed job asynchronously.
1474 We can't really check whether this particular job is being
1475 reported asynchronously, so just add the CR if the shell is
1476 currently interactive and asynchronous notification is enabled. */
1477 if (asynchronous_notification && interactive)
1478 fprintf (stream, "\r\n");
1480 fprintf (stream, "\n");
1490 /* Print information to STREAM about jobs[JOB_INDEX] according to FORMAT.
1491 Must be called with SIGCHLD blocked or queued with queue_sigchld */
1493 pretty_print_job (job_index, format, stream)
1494 int job_index, format;
1497 register PROCESS *p;
1499 /* Format only pid information about the process group leader? */
1500 if (format == JLIST_PID_ONLY)
1502 fprintf (stream, "%ld\n", (long)jobs[job_index]->pipe->pid);
1506 if (format == JLIST_CHANGED_ONLY)
1508 if (IS_NOTIFIED (job_index))
1510 format = JLIST_STANDARD;
1513 if (format != JLIST_NONINTERACTIVE)
1514 fprintf (stream, "[%d]%c ", job_index + 1,
1515 (job_index == js.j_current) ? '+':
1516 (job_index == js.j_previous) ? '-' : ' ');
1518 if (format == JLIST_NONINTERACTIVE)
1519 format = JLIST_LONG;
1521 p = jobs[job_index]->pipe;
1523 print_pipeline (p, job_index, format, stream);
1525 /* We have printed information about this job. When the job's
1526 status changes, waitchld () sets the notification flag to 0. */
1527 jobs[job_index]->flags |= J_NOTIFIED;
1531 print_job (job, format, state, job_index)
1533 int format, state, job_index;
1535 if (state == -1 || (JOB_STATE)state == job->state)
1536 pretty_print_job (job_index, format, stdout);
1541 list_one_job (job, format, ignore, job_index)
1543 int format, ignore, job_index;
1545 pretty_print_job (job_index, format, stdout);
1549 list_stopped_jobs (format)
1552 cleanup_dead_jobs ();
1553 map_over_jobs (print_job, format, (int)JSTOPPED);
1557 list_running_jobs (format)
1560 cleanup_dead_jobs ();
1561 map_over_jobs (print_job, format, (int)JRUNNING);
1564 /* List jobs. If FORMAT is non-zero, then the long form of the information
1565 is printed, else just a short version. */
1567 list_all_jobs (format)
1570 cleanup_dead_jobs ();
1571 map_over_jobs (print_job, format, -1);
1574 /* Fork, handling errors. Returns the pid of the newly made child, or 0.
1575 COMMAND is just for remembering the name of the command; we don't do
1576 anything else with it. ASYNC_P says what to do with the tty. If
1577 non-zero, then don't give it away. */
1579 make_child (command, async_p)
1587 sigaddset (&set, SIGCHLD);
1588 sigaddset (&set, SIGINT);
1589 sigemptyset (&oset);
1590 sigprocmask (SIG_BLOCK, &set, &oset);
1594 #if defined (BUFFERED_INPUT)
1595 /* If default_buffered_input is active, we are reading a script. If
1596 the command is asynchronous, we have already duplicated /dev/null
1597 as fd 0, but have not changed the buffered stream corresponding to
1598 the old fd 0. We don't want to sync the stream in this case. */
1599 if (default_buffered_input != -1 &&
1600 (!async_p || default_buffered_input > 0))
1601 sync_buffered_stream (default_buffered_input);
1602 #endif /* BUFFERED_INPUT */
1604 /* Create the child, handle severe errors. */
1605 if ((pid = fork ()) < 0)
1609 /* Kill all of the processes in the current pipeline. */
1610 terminate_current_pipeline ();
1612 /* Discard the current pipeline, if any. */
1614 kill_current_pipeline ();
1616 throw_to_top_level (); /* Reset signals, etc. */
1621 /* In the child. Give this child the right process group, set the
1622 signals to the default state for a new process. */
1626 #if defined (BUFFERED_INPUT)
1627 /* Close default_buffered_input if it's > 0. We don't close it if it's
1628 0 because that's the file descriptor used when redirecting input,
1629 and it's wrong to close the file in that case. */
1630 unset_bash_input (0);
1631 #endif /* BUFFERED_INPUT */
1633 /* Restore top-level signal mask. */
1634 sigprocmask (SIG_SETMASK, &top_level_mask, (sigset_t *)NULL);
1638 /* All processes in this pipeline belong in the same
1641 if (pipeline_pgrp == 0) /* This is the first child. */
1642 pipeline_pgrp = mypid;
1644 /* Check for running command in backquotes. */
1645 if (pipeline_pgrp == shell_pgrp)
1646 ignore_tty_job_signals ();
1648 default_tty_job_signals ();
1650 /* Set the process group before trying to mess with the terminal's
1651 process group. This is mandated by POSIX. */
1652 /* This is in accordance with the Posix 1003.1 standard,
1653 section B.7.2.4, which says that trying to set the terminal
1654 process group with tcsetpgrp() to an unused pgrp value (like
1655 this would have for the first child) is an error. Section
1656 B.4.3.3, p. 237 also covers this, in the context of job control
1658 if (setpgid (mypid, pipeline_pgrp) < 0)
1659 sys_error ("child setpgid (%ld to %ld)", (long)mypid, (long)pipeline_pgrp);
1661 /* By convention (and assumption above), if
1662 pipeline_pgrp == shell_pgrp, we are making a child for
1663 command substitution.
1664 In this case, we don't want to give the terminal to the
1665 shell's process group (we could be in the middle of a
1666 pipeline, for example). */
1667 if (async_p == 0 && pipeline_pgrp != shell_pgrp)
1668 give_terminal_to (pipeline_pgrp, 0);
1670 #if defined (PGRP_PIPE)
1671 if (pipeline_pgrp == mypid)
1672 pipe_read (pgrp_pipe);
1675 else /* Without job control... */
1677 if (pipeline_pgrp == 0)
1678 pipeline_pgrp = shell_pgrp;
1680 /* If these signals are set to SIG_DFL, we encounter the curious
1681 situation of an interactive ^Z to a running process *working*
1682 and stopping the process, but being unable to do anything with
1683 that process to change its state. On the other hand, if they
1684 are set to SIG_IGN, jobs started from scripts do not stop when
1685 the shell running the script gets a SIGTSTP and stops. */
1687 default_tty_job_signals ();
1690 #if defined (PGRP_PIPE)
1691 /* Release the process group pipe, since our call to setpgid ()
1692 is done. The last call to pipe_close is done in stop_pipeline. */
1693 pipe_close (pgrp_pipe);
1694 #endif /* PGRP_PIPE */
1697 last_asynchronous_pid = mypid;
1698 #if defined (RECYCLES_PIDS)
1699 else if (last_asynchronous_pid == mypid)
1700 /* Avoid pid aliasing. 1 seems like a safe, unusual pid value. */
1701 last_asynchronous_pid = 1;
1706 /* In the parent. Remember the pid of the child just created
1707 as the proper pgrp if this is the first child. */
1711 if (pipeline_pgrp == 0)
1713 pipeline_pgrp = pid;
1714 /* Don't twiddle terminal pgrps in the parent! This is the bug,
1715 not the good thing of twiddling them in the child! */
1716 /* give_terminal_to (pipeline_pgrp, 0); */
1718 /* This is done on the recommendation of the Rationale section of
1719 the POSIX 1003.1 standard, where it discusses job control and
1720 shells. It is done to avoid possible race conditions. (Ref.
1721 1003.1 Rationale, section B.4.3.3, page 236). */
1722 setpgid (pid, pipeline_pgrp);
1726 if (pipeline_pgrp == 0)
1727 pipeline_pgrp = shell_pgrp;
1730 /* Place all processes into the jobs array regardless of the
1731 state of job_control. */
1732 add_process (command, pid);
1735 last_asynchronous_pid = pid;
1736 #if defined (RECYCLES_PIDS)
1737 else if (last_asynchronous_pid == pid)
1738 /* Avoid pid aliasing. 1 seems like a safe, unusual pid value. */
1739 last_asynchronous_pid = 1;
1742 #if !defined (RECYCLES_PIDS)
1743 /* Only check for saved status if we've saved more than CHILD_MAX
1744 statuses, unless the system recycles pids. */
1745 if ((js.c_reaped + bgpids.npid) >= js.c_childmax)
1747 bgp_delete (pid); /* new process, discard any saved status */
1749 last_made_pid = pid;
1755 /* Unblock SIGINT and SIGCHLD unless creating a pipeline, in which case
1756 SIGCHLD remains blocked until all commands in the pipeline have been
1758 sigprocmask (SIG_SETMASK, &oset, (sigset_t *)NULL);
1764 /* These two functions are called only in child processes. */
1766 ignore_tty_job_signals ()
1768 set_signal_handler (SIGTSTP, SIG_IGN);
1769 set_signal_handler (SIGTTIN, SIG_IGN);
1770 set_signal_handler (SIGTTOU, SIG_IGN);
1774 default_tty_job_signals ()
1776 set_signal_handler (SIGTSTP, SIG_DFL);
1777 set_signal_handler (SIGTTIN, SIG_DFL);
1778 set_signal_handler (SIGTTOU, SIG_DFL);
1781 /* When we end a job abnormally, or if we stop a job, we set the tty to the
1782 state kept in here. When a job ends normally, we set the state in here
1783 to the state of the tty. */
1785 static TTYSTRUCT shell_tty_info;
1787 #if defined (NEW_TTY_DRIVER)
1788 static struct tchars shell_tchars;
1789 static struct ltchars shell_ltchars;
1790 #endif /* NEW_TTY_DRIVER */
1792 #if defined (NEW_TTY_DRIVER) && defined (DRAIN_OUTPUT)
1793 /* Since the BSD tty driver does not allow us to change the tty modes
1794 while simultaneously waiting for output to drain and preserving
1795 typeahead, we have to drain the output ourselves before calling
1796 ioctl. We cheat by finding the length of the output queue, and
1797 using select to wait for an appropriate length of time. This is
1798 a hack, and should be labeled as such (it's a hastily-adapted
1799 mutation of a `usleep' implementation). It's only reason for
1800 existing is the flaw in the BSD tty driver. */
1802 static int ttspeeds[] =
1804 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200,
1805 1800, 2400, 4800, 9600, 19200, 38400
1812 register int delay = ttspeeds[ospeed];
1818 while ((ioctl (fd, TIOCOUTQ, &n) == 0) && n)
1820 if (n > (delay / 100))
1824 n *= 10; /* 2 bits more for conservativeness. */
1825 tv.tv_sec = n / delay;
1826 tv.tv_usec = ((n % delay) * 1000000) / delay;
1827 select (fd, (fd_set *)0, (fd_set *)0, (fd_set *)0, &tv);
1833 #endif /* NEW_TTY_DRIVER && DRAIN_OUTPUT */
1835 /* Return the fd from which we are actually getting input. */
1836 #define input_tty() (shell_tty != -1) ? shell_tty : fileno (stderr)
1838 /* Fill the contents of shell_tty_info with the current tty info. */
1847 #if defined (NEW_TTY_DRIVER)
1848 ioctl (tty, TIOCGETP, &shell_tty_info);
1849 ioctl (tty, TIOCGETC, &shell_tchars);
1850 ioctl (tty, TIOCGLTC, &shell_ltchars);
1851 #endif /* NEW_TTY_DRIVER */
1853 #if defined (TERMIO_TTY_DRIVER)
1854 ioctl (tty, TCGETA, &shell_tty_info);
1855 #endif /* TERMIO_TTY_DRIVER */
1857 #if defined (TERMIOS_TTY_DRIVER)
1858 if (tcgetattr (tty, &shell_tty_info) < 0)
1861 /* Only print an error message if we're really interactive at
1864 sys_error ("[%ld: %d] tcgetattr", (long)getpid (), shell_level);
1868 #endif /* TERMIOS_TTY_DRIVER */
1869 if (check_window_size)
1870 get_new_window_size (0);
1875 /* Make the current tty use the state in shell_tty_info. */
1884 #if defined (NEW_TTY_DRIVER)
1885 # if defined (DRAIN_OUTPUT)
1886 draino (tty, shell_tty_info.sg_ospeed);
1887 # endif /* DRAIN_OUTPUT */
1888 ioctl (tty, TIOCSETN, &shell_tty_info);
1889 ioctl (tty, TIOCSETC, &shell_tchars);
1890 ioctl (tty, TIOCSLTC, &shell_ltchars);
1891 #endif /* NEW_TTY_DRIVER */
1893 #if defined (TERMIO_TTY_DRIVER)
1894 ioctl (tty, TCSETAW, &shell_tty_info);
1895 #endif /* TERMIO_TTY_DRIVER */
1897 #if defined (TERMIOS_TTY_DRIVER)
1898 if (tcsetattr (tty, TCSADRAIN, &shell_tty_info) < 0)
1900 /* Only print an error message if we're really interactive at
1903 sys_error ("[%ld: %d] tcsetattr", (long)getpid (), shell_level);
1906 #endif /* TERMIOS_TTY_DRIVER */
1911 /* Given an index into the jobs array JOB, return the PROCESS struct of the last
1912 process in that job's pipeline. This is the one whose exit status
1913 counts. Must be called with SIGCHLD blocked or queued. */
1915 find_last_proc (job, block)
1919 register PROCESS *p;
1923 BLOCK_CHILD (set, oset);
1925 p = jobs[job]->pipe;
1926 while (p->next != jobs[job]->pipe)
1930 UNBLOCK_CHILD (oset);
1936 find_last_pid (job, block)
1942 p = find_last_proc (job, block);
1943 /* Possible race condition here. */
1947 /* Wait for a particular child of the shell to finish executing.
1948 This low-level function prints an error message if PID is not
1949 a child of this shell. It returns -1 if it fails, or whatever
1950 wait_for returns otherwise. If the child is not found in the
1951 jobs table, it returns 127. */
1953 wait_for_single_pid (pid)
1956 register PROCESS *child;
1960 BLOCK_CHILD (set, oset);
1961 child = find_pipeline (pid, 0, (int *)NULL);
1962 UNBLOCK_CHILD (oset);
1966 r = bgp_search (pid);
1973 internal_error (_("wait: pid %ld is not a child of this shell"), (long)pid);
1979 /* POSIX.2: if we just waited for a job, we can remove it from the jobs
1981 BLOCK_CHILD (set, oset);
1982 job = find_job (pid, 0, NULL);
1983 if (job != NO_JOB && jobs[job] && DEADJOB (job))
1984 jobs[job]->flags |= J_NOTIFIED;
1985 UNBLOCK_CHILD (oset);
1987 /* If running in posix mode, remove the job from the jobs table immediately */
1988 if (posixly_correct)
1989 cleanup_dead_jobs ();
1994 /* Wait for all of the backgrounds of this shell to finish. */
1996 wait_for_background_pids ()
1998 register int i, r, waited_for;
2002 for (waited_for = 0;;)
2004 BLOCK_CHILD (set, oset);
2006 /* find first running job; if none running in foreground, break */
2007 /* XXX could use js.j_firstj here */
2008 for (i = 0; i < js.j_jobslots; i++)
2011 if (i < js.j_firstj && jobs[i])
2012 itrace("wait_for_background_pids: job %d non-null before js.j_firstj (%d)", i, js.j_firstj);
2014 if (jobs[i] && RUNNING (i) && IS_FOREGROUND (i) == 0)
2017 if (i == js.j_jobslots)
2019 UNBLOCK_CHILD (oset);
2023 /* now wait for the last pid in that job. */
2024 pid = find_last_pid (i, 0);
2025 UNBLOCK_CHILD (oset);
2027 errno = 0; /* XXX */
2028 r = wait_for_single_pid (pid);
2031 /* If we're mistaken about job state, compensate. */
2032 if (errno == ECHILD)
2033 mark_all_jobs_as_dead ();
2039 /* POSIX.2 says the shell can discard the statuses of all completed jobs if
2040 `wait' is called with no arguments. */
2041 mark_dead_jobs_as_notified (1);
2042 cleanup_dead_jobs ();
2046 /* Make OLD_SIGINT_HANDLER the SIGINT signal handler. */
2047 #define INVALID_SIGNAL_HANDLER (SigHandler *)wait_for_background_pids
2048 static SigHandler *old_sigint_handler = INVALID_SIGNAL_HANDLER;
2051 restore_sigint_handler ()
2053 if (old_sigint_handler != INVALID_SIGNAL_HANDLER)
2055 set_signal_handler (SIGINT, old_sigint_handler);
2056 old_sigint_handler = INVALID_SIGNAL_HANDLER;
2060 static int wait_sigint_received;
2062 /* Handle SIGINT while we are waiting for children in a script to exit.
2063 The `wait' builtin should be interruptible, but all others should be
2064 effectively ignored (i.e. not cause the shell to exit). */
2066 wait_sigint_handler (sig)
2069 SigHandler *sigint_handler;
2071 if (interrupt_immediately ||
2072 (this_shell_builtin && this_shell_builtin == wait_builtin))
2074 last_command_exit_value = EXECUTION_FAILURE;
2075 restore_sigint_handler ();
2076 /* If we got a SIGINT while in `wait', and SIGINT is trapped, do
2077 what POSIX.2 says (see builtins/wait.def for more info). */
2078 if (this_shell_builtin && this_shell_builtin == wait_builtin &&
2079 signal_is_trapped (SIGINT) &&
2080 ((sigint_handler = trap_to_sighandler (SIGINT)) == trap_handler))
2082 interrupt_immediately = 0;
2083 trap_handler (SIGINT); /* set pending_traps[SIGINT] */
2084 wait_signal_received = SIGINT;
2085 longjmp (wait_intr_buf, 1);
2092 /* XXX - should this be interrupt_state? If it is, the shell will act
2093 as if it got the SIGINT interrupt. */
2094 wait_sigint_received = 1;
2096 /* Otherwise effectively ignore the SIGINT and allow the running job to
2102 process_exit_signal (status)
2105 return (WIFSIGNALED (status) ? WTERMSIG (status) : 0);
2109 process_exit_status (status)
2112 if (WIFSIGNALED (status))
2113 return (128 + WTERMSIG (status));
2114 else if (WIFSTOPPED (status) == 0)
2115 return (WEXITSTATUS (status));
2117 return (EXECUTION_SUCCESS);
2120 /* Return the exit status of the last process in the pipeline for job JOB.
2121 This is the exit status of the entire job. */
2123 raw_job_exit_status (job)
2126 register PROCESS *p;
2132 p = jobs[job]->pipe;
2135 if (p->status != EXECUTION_SUCCESS) fail = p->status;
2138 while (p != jobs[job]->pipe);
2142 for (p = jobs[job]->pipe; p->next != jobs[job]->pipe; p = p->next)
2147 /* Return the exit status of job JOB. This is the exit status of the last
2148 (rightmost) process in the job's pipeline, modified if the job was killed
2149 by a signal or stopped. */
2151 job_exit_status (job)
2154 return (process_exit_status (raw_job_exit_status (job)));
2158 job_exit_signal (job)
2161 return (process_exit_signal (raw_job_exit_status (job)));
2164 #define FIND_CHILD(pid, child) \
2167 child = find_pipeline (pid, 0, (int *)NULL); \
2170 give_terminal_to (shell_pgrp, 0); \
2171 UNBLOCK_CHILD (oset); \
2172 internal_error (_("wait_for: No record of process %ld"), (long)pid); \
2173 restore_sigint_handler (); \
2174 return (termination_state = 127); \
2179 /* Wait for pid (one of our children) to terminate, then
2180 return the termination state. Returns 127 if PID is not found in
2181 the jobs table. Returns -1 if waitchld() returns -1, indicating
2182 that there are no unwaited-for child processes. */
2187 int job, termination_state, r;
2189 register PROCESS *child;
2191 register PROCESS *p;
2193 /* In the case that this code is interrupted, and we longjmp () out of it,
2194 we are relying on the code in throw_to_top_level () to restore the
2195 top-level signal mask. */
2196 BLOCK_CHILD (set, oset);
2198 /* Ignore interrupts while waiting for a job run without job control
2199 to finish. We don't want the shell to exit if an interrupt is
2200 received, only if one of the jobs run is killed via SIGINT. If
2201 job control is not set, the job will be run in the same pgrp as
2202 the shell, and the shell will see any signals the job gets. */
2204 /* This is possibly a race condition -- should it go in stop_pipeline? */
2205 wait_sigint_received = 0;
2206 if (job_control == 0)
2207 old_sigint_handler = set_signal_handler (SIGINT, wait_sigint_handler);
2209 termination_state = last_command_exit_value;
2211 if (interactive && job_control == 0)
2214 /* If we say wait_for (), then we have a record of this child somewhere.
2215 If it and none of its peers are running, don't call waitchld(). */
2220 FIND_CHILD (pid, child);
2222 /* If this child is part of a job, then we are really waiting for the
2223 job to finish. Otherwise, we are waiting for the child to finish.
2224 We check for JDEAD in case the job state has been set by waitchld
2225 after receipt of a SIGCHLD. */
2227 job = find_job (pid, 0, NULL);
2229 /* waitchld() takes care of setting the state of the job. If the job
2230 has already exited before this is called, sigchld_handler will have
2231 called waitchld and the state will be set to JDEAD. */
2233 if (PRUNNING(child) || (job != NO_JOB && RUNNING (job)))
2235 #if defined (WAITPID_BROKEN) /* SCOv4 */
2236 sigset_t suspend_set;
2237 sigemptyset (&suspend_set);
2238 sigsuspend (&suspend_set);
2239 #else /* !WAITPID_BROKEN */
2240 # if defined (MUST_UNBLOCK_CHLD)
2241 struct sigaction act, oact;
2242 sigset_t nullset, chldset;
2244 sigemptyset (&nullset);
2245 sigemptyset (&chldset);
2246 sigprocmask (SIG_SETMASK, &nullset, &chldset);
2247 act.sa_handler = SIG_DFL;
2248 sigemptyset (&act.sa_mask);
2249 sigemptyset (&oact.sa_mask);
2251 sigaction (SIGCHLD, &act, &oact);
2254 r = waitchld (pid, 1);
2255 # if defined (MUST_UNBLOCK_CHLD)
2256 sigaction (SIGCHLD, &oact, (struct sigaction *)NULL);
2257 sigprocmask (SIG_SETMASK, &chldset, (sigset_t *)NULL);
2260 if (r == -1 && errno == ECHILD && this_shell_builtin == wait_builtin)
2262 termination_state = -1;
2263 goto wait_for_return;
2266 /* If child is marked as running, but waitpid() returns -1/ECHILD,
2267 there is something wrong. Somewhere, wait should have returned
2268 that child's pid. Mark the child as not running and the job,
2269 if it exists, as JDEAD. */
2270 if (r == -1 && errno == ECHILD)
2272 child->running = PS_DONE;
2273 child->status = 0; /* XXX -- can't find true status */
2276 jobs[job]->state = JDEAD;
2281 #endif /* WAITPID_BROKEN */
2284 /* If the shell is interactive, and job control is disabled, see
2285 if the foreground process has died due to SIGINT and jump out
2286 of the wait loop if it has. waitchld has already restored the
2287 old SIGINT signal handler. */
2288 if (interactive && job_control == 0)
2291 while (PRUNNING (child) || (job != NO_JOB && RUNNING (job)));
2293 /* The exit state of the command is either the termination state of the
2294 child, or the termination state of the job. If a job, the status
2295 of the last child in the pipeline is the significant one. If the command
2296 or job was terminated by a signal, note that value also. */
2297 termination_state = (job != NO_JOB) ? job_exit_status (job)
2298 : process_exit_status (child->status);
2299 last_command_exit_signal = (job != NO_JOB) ? job_exit_signal (job)
2300 : process_exit_signal (child->status);
2303 if ((job != NO_JOB && JOBSTATE (job) == JSTOPPED) || WIFSTOPPED (child->status))
2304 termination_state = 128 + WSTOPSIG (child->status);
2306 if (job == NO_JOB || IS_JOBCONTROL (job))
2308 /* XXX - under what circumstances is a job not present in the jobs
2309 table (job == NO_JOB)?
2310 1. command substitution
2312 In the case of command substitution, at least, it's probably not
2313 the right thing to give the terminal to the shell's process group,
2314 even though there is code in subst.c:command_substitute to work
2318 $PROMPT_COMMAND execution
2319 process substitution
2323 itrace("wait_for: job == NO_JOB, giving the terminal to shell_pgrp (%ld)", (long)shell_pgrp);
2326 give_terminal_to (shell_pgrp, 0);
2329 /* If the command did not exit cleanly, or the job is just
2330 being stopped, then reset the tty state back to what it
2331 was before this command. Reset the tty state and notify
2332 the user of the job termination only if the shell is
2333 interactive. Clean up any dead jobs in either case. */
2336 if (interactive_shell && subshell_environment == 0)
2338 /* This used to use `child->status'. That's wrong, however, for
2339 pipelines. `child' is the first process in the pipeline. It's
2340 likely that the process we want to check for abnormal termination
2341 or stopping is the last process in the pipeline, especially if
2342 it's long-lived and the first process is short-lived. Since we
2343 know we have a job here, we can check all the processes in this
2344 job's pipeline and see if one of them stopped or terminated due
2345 to a signal. We might want to change this later to just check
2346 the last process in the pipeline. If no process exits due to a
2347 signal, S is left as the status of the last job in the pipeline. */
2348 p = jobs[job]->pipe;
2352 if (WIFSIGNALED(s) || WIFSTOPPED(s))
2356 while (p != jobs[job]->pipe);
2358 if (WIFSIGNALED (s) || WIFSTOPPED (s))
2362 /* If the current job was stopped or killed by a signal, and
2363 the user has requested it, get a possibly new window size */
2364 if (check_window_size && (job == js.j_current || IS_FOREGROUND (job)))
2365 get_new_window_size (0);
2370 /* If job control is enabled, the job was started with job
2371 control, the job was the foreground job, and it was killed
2372 by SIGINT, then print a newline to compensate for the kernel
2373 printing the ^C without a trailing newline. */
2374 if (job_control && IS_JOBCONTROL (job) && IS_FOREGROUND (job) &&
2375 WIFSIGNALED (s) && WTERMSIG (s) == SIGINT)
2377 /* If SIGINT is not trapped and the shell is in a for, while,
2378 or until loop, act as if the shell received SIGINT as
2379 well, so the loop can be broken. This doesn't call the
2380 SIGINT signal handler; maybe it should. */
2381 if (signal_is_trapped (SIGINT) == 0 && loop_level)
2391 /* Moved here from set_job_status_and_cleanup, which is in the SIGCHLD
2392 signal handler path */
2393 if (DEADJOB (job) && IS_FOREGROUND (job) /*&& subshell_environment == 0*/)
2396 /* If this job is dead, notify the user of the status. If the shell
2397 is interactive, this will display a message on the terminal. If
2398 the shell is not interactive, make sure we turn on the notify bit
2399 so we don't get an unwanted message about the job's termination,
2400 and so delete_job really clears the slot in the jobs table. */
2401 notify_and_cleanup ();
2406 UNBLOCK_CHILD (oset);
2408 /* Restore the original SIGINT signal handler before we return. */
2409 restore_sigint_handler ();
2411 return (termination_state);
2414 /* Wait for the last process in the pipeline for JOB. Returns whatever
2415 wait_for returns: the last process's termination state or -1 if there
2416 are no unwaited-for child processes or an error occurs. */
2425 BLOCK_CHILD(set, oset);
2426 if (JOBSTATE (job) == JSTOPPED)
2427 internal_warning (_("wait_for_job: job %d is stopped"), job+1);
2429 pid = find_last_pid (job, 0);
2430 UNBLOCK_CHILD(oset);
2433 /* POSIX.2: we can remove the job from the jobs table if we just waited
2435 BLOCK_CHILD (set, oset);
2436 if (job != NO_JOB && jobs[job] && DEADJOB (job))
2437 jobs[job]->flags |= J_NOTIFIED;
2438 UNBLOCK_CHILD (oset);
2443 /* Print info about dead jobs, and then delete them from the list
2444 of known jobs. This does not actually delete jobs when the
2445 shell is not interactive, because the dead jobs are not marked
2448 notify_and_cleanup ()
2450 if (jobs_list_frozen)
2453 if (interactive || interactive_shell == 0 || sourcelevel)
2454 notify_of_job_status ();
2456 cleanup_dead_jobs ();
2459 /* Make dead jobs disappear from the jobs array without notification.
2460 This is used when the shell is not interactive. */
2464 mark_dead_jobs_as_notified (0);
2465 cleanup_dead_jobs ();
2468 /* Return the next closest (chronologically) job to JOB which is in
2469 STATE. STATE can be JSTOPPED, JRUNNING. NO_JOB is returned if
2470 there is no next recent job. */
2472 most_recent_job_in_state (job, state)
2476 register int i, result;
2479 BLOCK_CHILD (set, oset);
2481 for (result = NO_JOB, i = job - 1; i >= 0; i--)
2483 if (jobs[i] && (JOBSTATE (i) == state))
2490 UNBLOCK_CHILD (oset);
2495 /* Return the newest *stopped* job older than JOB, or NO_JOB if not
2498 job_last_stopped (job)
2501 return (most_recent_job_in_state (job, JSTOPPED));
2504 /* Return the newest *running* job older than JOB, or NO_JOB if not
2507 job_last_running (job)
2510 return (most_recent_job_in_state (job, JRUNNING));
2513 /* Make JOB be the current job, and make previous be useful. Must be
2514 called with SIGCHLD blocked. */
2516 set_current_job (job)
2521 if (js.j_current != job)
2523 js.j_previous = js.j_current;
2527 /* First choice for previous job is the old current job. */
2528 if (js.j_previous != js.j_current &&
2529 js.j_previous != NO_JOB &&
2530 jobs[js.j_previous] &&
2531 STOPPED (js.j_previous))
2534 /* Second choice: Newest stopped job that is older than
2537 if (STOPPED (js.j_current))
2539 candidate = job_last_stopped (js.j_current);
2541 if (candidate != NO_JOB)
2543 js.j_previous = candidate;
2548 /* If we get here, there is either only one stopped job, in which case it is
2549 the current job and the previous job should be set to the newest running
2550 job, or there are only running jobs and the previous job should be set to
2551 the newest running job older than the current job. We decide on which
2552 alternative to use based on whether or not JOBSTATE(js.j_current) is
2555 candidate = RUNNING (js.j_current) ? job_last_running (js.j_current)
2556 : job_last_running (js.j_jobslots);
2558 if (candidate != NO_JOB)
2560 js.j_previous = candidate;
2564 /* There is only a single job, and it is both `+' and `-'. */
2565 js.j_previous = js.j_current;
2568 /* Make current_job be something useful, if it isn't already. */
2570 /* Here's the deal: The newest non-running job should be `+', and the
2571 next-newest non-running job should be `-'. If there is only a single
2572 stopped job, the js.j_previous is the newest non-running job. If there
2573 are only running jobs, the newest running job is `+' and the
2574 next-newest running job is `-'. Must be called with SIGCHLD blocked. */
2581 if (js.j_jobslots && js.j_current != NO_JOB && jobs[js.j_current] && STOPPED (js.j_current))
2582 candidate = js.j_current;
2587 /* First choice: the previous job. */
2588 if (js.j_previous != NO_JOB && jobs[js.j_previous] && STOPPED (js.j_previous))
2589 candidate = js.j_previous;
2591 /* Second choice: the most recently stopped job. */
2592 if (candidate == NO_JOB)
2593 candidate = job_last_stopped (js.j_jobslots);
2595 /* Third choice: the newest running job. */
2596 if (candidate == NO_JOB)
2597 candidate = job_last_running (js.j_jobslots);
2600 /* If we found a job to use, then use it. Otherwise, there
2601 are no jobs period. */
2602 if (candidate != NO_JOB)
2603 set_current_job (candidate);
2605 js.j_current = js.j_previous = NO_JOB;
2608 /* Set up the job structures so we know the job and its processes are
2611 set_job_running (job)
2614 register PROCESS *p;
2616 /* Each member of the pipeline is now running. */
2617 p = jobs[job]->pipe;
2621 if (WIFSTOPPED (p->status))
2622 p->running = PS_RUNNING; /* XXX - could be PS_STOPPED */
2625 while (p != jobs[job]->pipe);
2627 /* This means that the job is running. */
2628 JOBSTATE (job) = JRUNNING;
2631 /* Start a job. FOREGROUND if non-zero says to do that. Otherwise,
2632 start the job in the background. JOB is a zero-based index into
2633 JOBS. Returns -1 if it is unable to start a job, and the return
2634 status of the job otherwise. */
2636 start_job (job, foreground)
2637 int job, foreground;
2639 register PROCESS *p;
2640 int already_running;
2643 static TTYSTRUCT save_stty;
2645 BLOCK_CHILD (set, oset);
2649 internal_error (_("%s: job has terminated"), this_command_name);
2650 UNBLOCK_CHILD (oset);
2654 already_running = RUNNING (job);
2656 if (foreground == 0 && already_running)
2658 internal_error (_("%s: job %d already in background"), this_command_name, job + 1);
2659 UNBLOCK_CHILD (oset);
2663 wd = current_working_directory ();
2665 /* You don't know about the state of this job. Do you? */
2666 jobs[job]->flags &= ~J_NOTIFIED;
2670 set_current_job (job);
2671 jobs[job]->flags |= J_FOREGROUND;
2674 /* Tell the outside world what we're doing. */
2675 p = jobs[job]->pipe;
2677 if (foreground == 0)
2678 printf ("[%d]%c ", job + 1,
2679 (job == js.j_current) ? '+': ((job == js.j_previous) ? '-' : ' '));
2684 p->command ? p->command : "",
2685 p->next != jobs[job]->pipe? " | " : "");
2688 while (p != jobs[job]->pipe);
2690 if (foreground == 0)
2693 if (strcmp (wd, jobs[job]->wd) != 0)
2694 printf (" (wd: %s)", polite_directory_format (jobs[job]->wd));
2699 if (already_running == 0)
2700 set_job_running (job);
2702 /* Save the tty settings before we start the job in the foreground. */
2706 save_stty = shell_tty_info;
2707 /* Give the terminal to this job. */
2708 if (IS_JOBCONTROL (job))
2709 give_terminal_to (jobs[job]->pgrp, 0);
2712 jobs[job]->flags &= ~J_FOREGROUND;
2714 /* If the job is already running, then don't bother jump-starting it. */
2715 if (already_running == 0)
2717 jobs[job]->flags |= J_NOTIFIED;
2718 killpg (jobs[job]->pgrp, SIGCONT);
2726 pid = find_last_pid (job, 0);
2727 UNBLOCK_CHILD (oset);
2729 shell_tty_info = save_stty;
2736 UNBLOCK_CHILD (oset);
2741 /* Give PID SIGNAL. This determines what job the pid belongs to (if any).
2742 If PID does belong to a job, and the job is stopped, then CONTinue the
2743 job after giving it SIGNAL. Returns -1 on failure. If GROUP is non-null,
2744 then kill the process group associated with PID. */
2746 kill_pid (pid, sig, group)
2750 register PROCESS *p;
2754 result = EXECUTION_SUCCESS;
2757 BLOCK_CHILD (set, oset);
2758 p = find_pipeline (pid, 0, &job);
2762 jobs[job]->flags &= ~J_NOTIFIED;
2764 /* Kill process in backquotes or one started without job control? */
2765 if (jobs[job]->pgrp == shell_pgrp)
2766 result = killpg (pid, sig);
2769 result = killpg (jobs[job]->pgrp, sig);
2770 if (p && STOPPED (job) && (sig == SIGTERM || sig == SIGHUP))
2771 killpg (jobs[job]->pgrp, SIGCONT);
2772 /* If we're continuing a stopped job via kill rather than bg or
2773 fg, emulate the `bg' behavior. */
2774 if (p && STOPPED (job) && (sig == SIGCONT))
2776 set_job_running (job);
2777 jobs[job]->flags &= ~J_FOREGROUND;
2778 jobs[job]->flags |= J_NOTIFIED;
2783 result = killpg (pid, sig);
2785 UNBLOCK_CHILD (oset);
2788 result = kill (pid, sig);
2793 /* sigchld_handler () flushes at least one of the children that we are
2794 waiting for. It gets run when we have gotten a SIGCHLD signal. */
2796 sigchld_handler (sig)
2802 REINSTALL_SIGCHLD_HANDLER;
2805 if (queue_sigchld == 0)
2806 n = waitchld (-1, 0);
2811 /* waitchld() reaps dead or stopped children. It's called by wait_for and
2812 sigchld_handler, and runs until there aren't any children terminating any
2814 If BLOCK is 1, this is to be a blocking wait for a single child, although
2815 an arriving SIGCHLD could cause the wait to be non-blocking. It returns
2816 the number of children reaped, or -1 if there are no unwaited-for child
2819 waitchld (wpid, block)
2826 int call_set_current, last_stopped_job, job, children_exited, waitpid_flags;
2827 static int wcontinued = WCONTINUED; /* run-time fix for glibc problem */
2829 call_set_current = children_exited = 0;
2830 last_stopped_job = NO_JOB;
2834 /* We don't want to be notified about jobs stopping if job control
2835 is not active. XXX - was interactive_shell instead of job_control */
2836 waitpid_flags = (job_control && subshell_environment == 0)
2837 ? (WUNTRACED|wcontinued)
2839 if (sigchld || block == 0)
2840 waitpid_flags |= WNOHANG;
2841 pid = WAITPID (-1, &status, waitpid_flags);
2843 /* WCONTINUED may be rejected by waitpid as invalid even when defined */
2844 if (wcontinued && pid < 0 && errno == EINVAL)
2847 continue; /* jump back to the test and retry without WCONTINUED */
2850 /* The check for WNOHANG is to make sure we decrement sigchld only
2851 if it was non-zero before we called waitpid. */
2852 if (sigchld > 0 && (waitpid_flags & WNOHANG))
2855 /* If waitpid returns -1 with errno == ECHILD, there are no more
2856 unwaited-for child processes of this shell. */
2857 if (pid < 0 && errno == ECHILD)
2859 if (children_exited == 0)
2865 /* If waitpid returns 0, there are running children. If it returns -1,
2866 the only other error POSIX says it can return is EINTR. */
2868 continue; /* jumps right to the test */
2870 /* children_exited is used to run traps on SIGCHLD. We don't want to
2871 run the trap if a process is just being continued. */
2872 if (WIFCONTINUED(status) == 0)
2875 /* Locate our PROCESS for this pid. */
2876 child = find_process (pid, 1, &job); /* want living procs only */
2878 /* It is not an error to have a child terminate that we did
2879 not have a record of. This child could have been part of
2880 a pipeline in backquote substitution. Even so, I'm not
2881 sure child is ever non-zero. */
2885 /* Remember status, and whether or not the process is running. */
2886 child->status = status;
2887 child->running = WIFCONTINUED(status) ? PS_RUNNING : PS_DONE;
2889 if (PEXITED (child))
2899 call_set_current += set_job_status_and_cleanup (job);
2902 last_stopped_job = job;
2903 else if (DEADJOB (job) && last_stopped_job == job)
2904 last_stopped_job = NO_JOB;
2906 while ((sigchld || block == 0) && pid > (pid_t)0);
2908 /* If a job was running and became stopped, then set the current
2909 job. Otherwise, don't change a thing. */
2910 if (call_set_current)
2912 if (last_stopped_job != NO_JOB)
2913 set_current_job (last_stopped_job);
2918 /* Call a SIGCHLD trap handler for each child that exits, if one is set. */
2919 if (job_control && signal_is_trapped (SIGCHLD) && children_exited &&
2920 trap_list[SIGCHLD] != (char *)IGNORE_SIG)
2921 run_sigchld_trap (children_exited);
2923 /* We have successfully recorded the useful information about this process
2924 that has just changed state. If we notify asynchronously, and the job
2925 that this process belongs to is no longer running, then notify the user
2926 of that fact now. */
2927 if (asynchronous_notification && interactive)
2928 notify_of_job_status ();
2930 return (children_exited);
2933 /* Set the status of JOB and perform any necessary cleanup if the job is
2936 Currently, the cleanup activity is restricted to handling any SIGINT
2937 received while waiting for a foreground job to finish. */
2939 set_job_status_and_cleanup (job)
2943 int tstatus, job_state, any_stopped, any_tstped, call_set_current;
2944 SigHandler *temp_handler;
2946 child = jobs[job]->pipe;
2947 jobs[job]->flags &= ~J_NOTIFIED;
2949 call_set_current = 0;
2952 * COMPUTE JOB STATUS
2955 /* If all children are not running, but any of them is stopped, then
2956 the job is stopped, not dead. */
2957 job_state = any_stopped = any_tstped = 0;
2960 job_state |= PRUNNING (child);
2962 if (PEXITED (child) && (WIFSTOPPED (child->status)))
2964 /* Only checking for WIFSTOPPED now, not for PS_DONE */
2965 if (PSTOPPED (child))
2969 any_tstped |= interactive && job_control &&
2970 (WSTOPSIG (child->status) == SIGTSTP);
2972 child = child->next;
2974 while (child != jobs[job]->pipe);
2976 /* If job_state != 0, the job is still running, so don't bother with
2977 setting the process exit status and job state unless we're
2978 transitioning from stopped to running. */
2979 if (job_state != 0 && JOBSTATE(job) != JSTOPPED)
2986 /* The job is either stopped or dead. Set the state of the job accordingly. */
2989 jobs[job]->state = JSTOPPED;
2990 jobs[job]->flags &= ~J_FOREGROUND;
2992 /* Suspending a job with SIGTSTP breaks all active loops. */
2993 if (any_tstped && loop_level)
2994 breaking = loop_level;
2996 else if (job_state != 0) /* was stopped, now running */
2998 jobs[job]->state = JRUNNING;
3003 jobs[job]->state = JDEAD;
3007 if (IS_FOREGROUND (job))
3011 /* If this job has a cleanup function associated with it, call it
3012 with `cleanarg' as the single argument, then set the function
3013 pointer to NULL so it is not inadvertently called twice. The
3014 cleanup function is responsible for deallocating cleanarg. */
3015 if (jobs[job]->j_cleanup)
3017 (*jobs[job]->j_cleanup) (jobs[job]->cleanarg);
3018 jobs[job]->j_cleanup = (sh_vptrfunc_t *)NULL;
3025 * Currently, we just do special things if we got a SIGINT while waiting
3026 * for a foreground job to complete
3029 if (JOBSTATE (job) == JDEAD)
3031 /* If we're running a shell script and we get a SIGINT with a
3032 SIGINT trap handler, but the foreground job handles it and
3033 does not exit due to SIGINT, run the trap handler but do not
3034 otherwise act as if we got the interrupt. */
3035 if (wait_sigint_received && interactive_shell == 0 &&
3036 WIFSIGNALED (child->status) == 0 && IS_FOREGROUND (job) &&
3037 signal_is_trapped (SIGINT))
3040 wait_sigint_received = 0;
3041 last_command_exit_value = process_exit_status (child->status);
3043 old_frozen = jobs_list_frozen;
3044 jobs_list_frozen = 1;
3045 tstatus = maybe_call_trap_handler (SIGINT);
3046 jobs_list_frozen = old_frozen;
3049 /* If the foreground job is killed by SIGINT when job control is not
3050 active, we need to perform some special handling.
3052 The check of wait_sigint_received is a way to determine if the
3053 SIGINT came from the keyboard (in which case the shell has already
3054 seen it, and wait_sigint_received is non-zero, because keyboard
3055 signals are sent to process groups) or via kill(2) to the foreground
3056 process by another process (or itself). If the shell did receive the
3057 SIGINT, it needs to perform normal SIGINT processing. */
3058 else if (wait_sigint_received && (WTERMSIG (child->status) == SIGINT) &&
3059 IS_FOREGROUND (job) && IS_JOBCONTROL (job) == 0)
3063 wait_sigint_received = 0;
3065 /* If SIGINT is trapped, set the exit status so that the trap
3066 handler can see it. */
3067 if (signal_is_trapped (SIGINT))
3068 last_command_exit_value = process_exit_status (child->status);
3070 /* If the signal is trapped, let the trap handler get it no matter
3071 what and simply return if the trap handler returns.
3072 maybe_call_trap_handler() may cause dead jobs to be removed from
3073 the job table because of a call to execute_command. We work
3074 around this by setting JOBS_LIST_FROZEN. */
3075 old_frozen = jobs_list_frozen;
3076 jobs_list_frozen = 1;
3077 tstatus = maybe_call_trap_handler (SIGINT);
3078 jobs_list_frozen = old_frozen;
3079 if (tstatus == 0 && old_sigint_handler != INVALID_SIGNAL_HANDLER)
3081 /* wait_sigint_handler () has already seen SIGINT and
3082 allowed the wait builtin to jump out. We need to
3083 call the original SIGINT handler, if necessary. If
3084 the original handler is SIG_DFL, we need to resend
3085 the signal to ourselves. */
3087 temp_handler = old_sigint_handler;
3089 /* Bogus. If we've reset the signal handler as the result
3090 of a trap caught on SIGINT, then old_sigint_handler
3091 will point to trap_handler, which now knows nothing about
3092 SIGINT (if we reset the sighandler to the default).
3093 In this case, we have to fix things up. What a crock. */
3094 if (temp_handler == trap_handler && signal_is_trapped (SIGINT) == 0)
3095 temp_handler = trap_to_sighandler (SIGINT);
3096 restore_sigint_handler ();
3097 if (temp_handler == SIG_DFL)
3098 termination_unwind_protect (SIGINT);
3099 else if (temp_handler != SIG_IGN)
3100 (*temp_handler) (SIGINT);
3105 return call_set_current;
3108 /* Build the array of values for the $PIPESTATUS variable from the set of
3109 exit statuses of all processes in the job J. */
3114 #if defined (ARRAY_VARS)
3116 register PROCESS *p;
3118 for (i = 1, p = jobs[j]->pipe; p->next != jobs[j]->pipe; p = p->next, i++)
3123 pstatuses = (int *)xrealloc (pstatuses, i * sizeof (int));
3130 pstatuses[i++] = process_exit_status (p->status);
3133 while (p != jobs[j]->pipe);
3135 pstatuses[i] = -1; /* sentinel */
3136 set_pipestatus_array (pstatuses, i);
3141 run_sigchld_trap (nchild)
3147 /* Turn off the trap list during the call to parse_and_execute ()
3148 to avoid potentially infinite recursive calls. Preserve the
3149 values of last_command_exit_value, last_made_pid, and the_pipeline
3150 around the execution of the trap commands. */
3151 trap_command = savestring (trap_list[SIGCHLD]);
3153 begin_unwind_frame ("SIGCHLD trap");
3154 unwind_protect_int (last_command_exit_value);
3155 unwind_protect_int (last_command_exit_signal);
3156 unwind_protect_var (last_made_pid);
3157 unwind_protect_int (interrupt_immediately);
3158 unwind_protect_int (jobs_list_frozen);
3159 unwind_protect_pointer (the_pipeline);
3160 unwind_protect_pointer (subst_assign_varlist);
3162 /* We have to add the commands this way because they will be run
3163 in reverse order of adding. We don't want maybe_set_sigchld_trap ()
3164 to reference freed memory. */
3165 add_unwind_protect (xfree, trap_command);
3166 add_unwind_protect (maybe_set_sigchld_trap, trap_command);
3168 subst_assign_varlist = (WORD_LIST *)NULL;
3169 the_pipeline = (PROCESS *)NULL;
3171 restore_default_signal (SIGCHLD);
3172 jobs_list_frozen = 1;
3173 for (i = 0; i < nchild; i++)
3175 interrupt_immediately = 1;
3176 parse_and_execute (savestring (trap_command), "trap", SEVAL_NOHIST|SEVAL_RESETLINE);
3179 run_unwind_frame ("SIGCHLD trap");
3182 /* Function to call when you want to notify people of changes
3183 in job status. This prints out all jobs which are pending
3184 notification to stderr, and marks those printed as already
3185 notified, thus making them candidates for cleanup. */
3187 notify_of_job_status ()
3189 register int job, termsig;
3194 if (jobs == 0 || js.j_jobslots == 0)
3200 sigaddset (&set, SIGCHLD);
3201 sigaddset (&set, SIGTTOU);
3202 sigemptyset (&oset);
3203 sigprocmask (SIG_BLOCK, &set, &oset);
3208 /* XXX could use js.j_firstj here */
3209 for (job = 0, dir = (char *)NULL; job < js.j_jobslots; job++)
3211 if (jobs[job] && IS_NOTIFIED (job) == 0)
3213 s = raw_job_exit_status (job);
3214 termsig = WTERMSIG (s);
3216 /* POSIX.2 says we have to hang onto the statuses of at most the
3217 last CHILD_MAX background processes if the shell is running a
3218 script. If the shell is running a script, either from a file
3219 or standard input, don't print anything unless the job was
3220 killed by a signal. */
3221 if (startup_state == 0 && WIFSIGNALED (s) == 0 &&
3222 ((DEADJOB (job) && IS_FOREGROUND (job) == 0) || STOPPED (job)))
3226 /* If job control is disabled, don't print the status messages.
3227 Mark dead jobs as notified so that they get cleaned up. If
3228 startup_state == 2, we were started to run `-c command', so
3229 don't print anything. */
3230 if ((job_control == 0 && interactive_shell) || startup_state == 2)
3232 /* If job control is disabled, don't print the status messages.
3233 Mark dead jobs as notified so that they get cleaned up. If
3234 startup_state == 2 and subshell_environment has the
3235 SUBSHELL_COMSUB bit turned on, we were started to run a command
3236 substitution, so don't print anything. */
3237 if ((job_control == 0 && interactive_shell) ||
3238 (startup_state == 2 && (subshell_environment & SUBSHELL_COMSUB)))
3241 /* POSIX.2 compatibility: if the shell is not interactive,
3242 hang onto the job corresponding to the last asynchronous
3243 pid until the user has been notified of its status or does
3245 if (DEADJOB (job) && (interactive_shell || (find_last_pid (job, 0) != last_asynchronous_pid)))
3246 jobs[job]->flags |= J_NOTIFIED;
3250 /* Print info on jobs that are running in the background,
3251 and on foreground jobs that were killed by anything
3252 except SIGINT (and possibly SIGPIPE). */
3253 switch (JOBSTATE (job))
3256 if (interactive_shell == 0 && termsig && WIFSIGNALED (s) &&
3257 termsig != SIGINT &&
3258 #if defined (DONT_REPORT_SIGPIPE)
3259 termsig != SIGPIPE &&
3261 signal_is_trapped (termsig) == 0)
3263 /* Don't print `0' for a line number. */
3264 fprintf (stderr, "%s: line %d: ", get_name_for_error (), (line_number == 0) ? 1 : line_number);
3265 pretty_print_job (job, JLIST_NONINTERACTIVE, stderr);
3267 else if (IS_FOREGROUND (job))
3269 #if !defined (DONT_REPORT_SIGPIPE)
3270 if (termsig && WIFSIGNALED (s) && termsig != SIGINT)
3272 if (termsig && WIFSIGNALED (s) && termsig != SIGINT && termsig != SIGPIPE)
3275 fprintf (stderr, "%s", j_strsignal (termsig));
3278 fprintf (stderr, " (core dumped)");
3280 fprintf (stderr, "\n");
3283 else if (job_control) /* XXX job control test added */
3286 dir = current_working_directory ();
3287 pretty_print_job (job, JLIST_STANDARD, stderr);
3288 if (dir && strcmp (dir, jobs[job]->wd) != 0)
3290 "(wd now: %s)\n", polite_directory_format (dir));
3293 jobs[job]->flags |= J_NOTIFIED;
3297 fprintf (stderr, "\n");
3299 dir = current_working_directory ();
3300 pretty_print_job (job, JLIST_STANDARD, stderr);
3301 if (dir && (strcmp (dir, jobs[job]->wd) != 0))
3303 "(wd now: %s)\n", polite_directory_format (dir));
3304 jobs[job]->flags |= J_NOTIFIED;
3312 programming_error ("notify_of_job_status");
3317 sigprocmask (SIG_SETMASK, &oset, (sigset_t *)NULL);
3322 /* Initialize the job control mechanism, and set up the tty stuff. */
3324 initialize_job_control (force)
3327 shell_pgrp = getpgid (0);
3329 if (shell_pgrp == -1)
3331 sys_error ("initialize_job_control: getpgrp failed");
3335 /* We can only have job control if we are interactive. */
3336 if (interactive == 0)
3339 original_pgrp = NO_PID;
3340 shell_tty = fileno (stderr);
3344 /* Get our controlling terminal. If job_control is set, or
3345 interactive is set, then this is an interactive shell no
3346 matter where fd 2 is directed. */
3347 shell_tty = dup (fileno (stderr)); /* fd 2 */
3349 shell_tty = move_to_high_fd (shell_tty, 1, -1);
3351 /* Compensate for a bug in systems that compiled the BSD
3352 rlogind with DEBUG defined, like NeXT and Alliant. */
3353 if (shell_pgrp == 0)
3355 shell_pgrp = getpid ();
3356 setpgid (0, shell_pgrp);
3357 tcsetpgrp (shell_tty, shell_pgrp);
3360 while ((terminal_pgrp = tcgetpgrp (shell_tty)) != -1)
3362 if (shell_pgrp != terminal_pgrp)
3366 ottin = set_signal_handler(SIGTTIN, SIG_DFL);
3368 set_signal_handler (SIGTTIN, ottin);
3374 /* Make sure that we are using the new line discipline. */
3375 if (set_new_line_discipline (shell_tty) < 0)
3377 sys_error ("initialize_job_control: line discipline");
3382 original_pgrp = shell_pgrp;
3383 shell_pgrp = getpid ();
3385 if ((original_pgrp != shell_pgrp) && (setpgid (0, shell_pgrp) < 0))
3387 sys_error ("initialize_job_control: setpgid");
3388 shell_pgrp = original_pgrp;
3393 /* If (and only if) we just set our process group to our pid,
3394 thereby becoming a process group leader, and the terminal
3395 is not in the same process group as our (new) process group,
3396 then set the terminal's process group to our (new) process
3397 group. If that fails, set our process group back to what it
3398 was originally (so we can still read from the terminal) and
3399 turn off job control. */
3400 if (shell_pgrp != original_pgrp && shell_pgrp != terminal_pgrp)
3402 if (give_terminal_to (shell_pgrp, 0) < 0)
3404 setpgid (0, original_pgrp);
3405 shell_pgrp = original_pgrp;
3410 if (job_control == 0)
3411 internal_error (_("no job control in this shell"));
3414 if (shell_tty != fileno (stderr))
3415 SET_CLOSE_ON_EXEC (shell_tty);
3417 set_signal_handler (SIGCHLD, sigchld_handler);
3419 change_flag ('m', job_control ? '-' : '+');
3424 if (js.c_childmax < 0)
3425 js.c_childmax = getmaxchild ();
3426 if (js.c_childmax < 0)
3427 js.c_childmax = DEFAULT_CHILD_MAX;
3434 debug_print_pgrps ()
3436 itrace("original_pgrp = %ld shell_pgrp = %ld terminal_pgrp = %ld",
3437 (long)original_pgrp, (long)shell_pgrp, (long)terminal_pgrp);
3438 itrace("tcgetpgrp(%d) -> %ld, getpgid(0) -> %ld",
3439 shell_tty, (long)tcgetpgrp (shell_tty), (long)getpgid(0));
3443 /* Set the line discipline to the best this system has to offer.
3444 Return -1 if this is not possible. */
3446 set_new_line_discipline (tty)
3449 #if defined (NEW_TTY_DRIVER)
3452 if (ioctl (tty, TIOCGETD, &ldisc) < 0)
3455 if (ldisc != NTTYDISC)
3459 if (ioctl (tty, TIOCSETD, &ldisc) < 0)
3463 #endif /* NEW_TTY_DRIVER */
3465 #if defined (TERMIO_TTY_DRIVER)
3466 # if defined (TERMIO_LDISC) && (NTTYDISC)
3467 if (ioctl (tty, TCGETA, &shell_tty_info) < 0)
3470 if (shell_tty_info.c_line != NTTYDISC)
3472 shell_tty_info.c_line = NTTYDISC;
3473 if (ioctl (tty, TCSETAW, &shell_tty_info) < 0)
3476 # endif /* TERMIO_LDISC && NTTYDISC */
3478 #endif /* TERMIO_TTY_DRIVER */
3480 #if defined (TERMIOS_TTY_DRIVER)
3481 # if defined (TERMIOS_LDISC) && defined (NTTYDISC)
3482 if (tcgetattr (tty, &shell_tty_info) < 0)
3485 if (shell_tty_info.c_line != NTTYDISC)
3487 shell_tty_info.c_line = NTTYDISC;
3488 if (tcsetattr (tty, TCSADRAIN, &shell_tty_info) < 0)
3491 # endif /* TERMIOS_LDISC && NTTYDISC */
3493 #endif /* TERMIOS_TTY_DRIVER */
3495 #if !defined (NEW_TTY_DRIVER) && !defined (TERMIO_TTY_DRIVER) && !defined (TERMIOS_TTY_DRIVER)
3500 #if defined (TIOCGWINSZ) && defined (SIGWINCH)
3502 get_new_window_size (from_sig)
3507 if ((ioctl (shell_tty, TIOCGWINSZ, &win) == 0) &&
3508 win.ws_row > 0 && win.ws_col > 0)
3511 shell_tty_info.c_winsize = win; /* structure copying */
3513 sh_set_lines_and_columns (win.ws_row, win.ws_col);
3514 #if defined (READLINE)
3515 rl_set_screen_size (win.ws_row, win.ws_col);
3521 sigwinch_sighandler (sig)
3524 #if defined (MUST_REINSTALL_SIGHANDLERS)
3525 set_signal_handler (SIGWINCH, sigwinch_sighandler);
3526 #endif /* MUST_REINSTALL_SIGHANDLERS */
3527 get_new_window_size (1);
3532 get_new_window_size (from_sig)
3536 #endif /* TIOCGWINSZ && SIGWINCH */
3539 set_sigwinch_handler ()
3541 #if defined (TIOCGWINSZ) && defined (SIGWINCH)
3542 old_winch = set_signal_handler (SIGWINCH, sigwinch_sighandler);
3547 unset_sigwinch_handler ()
3549 #if defined (TIOCGWINSZ) && defined (SIGWINCH)
3550 set_signal_handler (SIGWINCH, old_winch);
3554 /* Setup this shell to handle C-C, etc. */
3556 initialize_job_signals ()
3560 set_signal_handler (SIGINT, sigint_sighandler);
3561 set_signal_handler (SIGTSTP, SIG_IGN);
3562 set_signal_handler (SIGTTOU, SIG_IGN);
3563 set_signal_handler (SIGTTIN, SIG_IGN);
3564 set_sigwinch_handler ();
3566 else if (job_control)
3568 old_tstp = set_signal_handler (SIGTSTP, sigstop_sighandler);
3569 old_ttin = set_signal_handler (SIGTTIN, sigstop_sighandler);
3570 old_ttou = set_signal_handler (SIGTTOU, sigstop_sighandler);
3572 /* Leave these things alone for non-interactive shells without job
3576 /* Here we handle CONT signals. */
3578 sigcont_sighandler (sig)
3581 initialize_job_signals ();
3582 set_signal_handler (SIGCONT, old_cont);
3583 kill (getpid (), SIGCONT);
3588 /* Here we handle stop signals while we are running not as a login shell. */
3590 sigstop_sighandler (sig)
3593 set_signal_handler (SIGTSTP, old_tstp);
3594 set_signal_handler (SIGTTOU, old_ttou);
3595 set_signal_handler (SIGTTIN, old_ttin);
3597 old_cont = set_signal_handler (SIGCONT, sigcont_sighandler);
3599 give_terminal_to (shell_pgrp, 0);
3601 kill (getpid (), sig);
3606 /* Give the terminal to PGRP. */
3608 give_terminal_to (pgrp, force)
3616 if (job_control || force)
3619 sigaddset (&set, SIGTTOU);
3620 sigaddset (&set, SIGTTIN);
3621 sigaddset (&set, SIGTSTP);
3622 sigaddset (&set, SIGCHLD);
3623 sigemptyset (&oset);
3624 sigprocmask (SIG_BLOCK, &set, &oset);
3626 if (tcsetpgrp (shell_tty, pgrp) < 0)
3628 /* Maybe we should print an error message? */
3630 sys_error ("tcsetpgrp(%d) failed: pid %ld to pgrp %ld",
3631 shell_tty, (long)getpid(), (long)pgrp);
3636 terminal_pgrp = pgrp;
3637 sigprocmask (SIG_SETMASK, &oset, (sigset_t *)NULL);
3643 /* Clear out any jobs in the job array. This is intended to be used by
3644 children of the shell, who should not have any job structures as baggage
3645 when they start executing (forking subshells for parenthesized execution
3646 and functions with pipes are the two that spring to mind). If RUNNING_ONLY
3647 is nonzero, only running jobs are removed from the table. */
3649 delete_all_jobs (running_only)
3655 BLOCK_CHILD (set, oset);
3657 /* XXX - need to set j_lastj, j_firstj appropriately if running_only != 0. */
3660 js.j_current = js.j_previous = NO_JOB;
3662 /* XXX could use js.j_firstj here */
3663 for (i = 0; i < js.j_jobslots; i++)
3666 if (i < js.j_firstj && jobs[i])
3667 itrace("delete_all_jobs: job %d non-null before js.j_firstj (%d)", i, js.j_firstj);
3669 if (jobs[i] && (running_only == 0 || (running_only && RUNNING(i))))
3672 if (running_only == 0)
3674 free ((char *)jobs);
3676 js.j_firstj = js.j_lastj = js.j_njobs = 0;
3680 if (running_only == 0)
3683 UNBLOCK_CHILD (oset);
3686 /* Mark all jobs in the job array so that they don't get a SIGHUP when the
3687 shell gets one. If RUNNING_ONLY is nonzero, mark only running jobs. */
3689 nohup_all_jobs (running_only)
3695 BLOCK_CHILD (set, oset);
3699 /* XXX could use js.j_firstj here */
3700 for (i = 0; i < js.j_jobslots; i++)
3701 if (jobs[i] && (running_only == 0 || (running_only && RUNNING(i))))
3705 UNBLOCK_CHILD (oset);
3714 /* This really counts all non-dead jobs. */
3715 BLOCK_CHILD (set, oset);
3716 /* XXX could use js.j_firstj here */
3717 for (i = n = 0; i < js.j_jobslots; i++)
3720 if (i < js.j_firstj && jobs[i])
3721 itrace("count_all_jobs: job %d non-null before js.j_firstj (%d)", i, js.j_firstj);
3723 if (jobs[i] && DEADJOB(i) == 0)
3726 UNBLOCK_CHILD (oset);
3731 mark_all_jobs_as_dead ()
3736 if (js.j_jobslots == 0)
3739 BLOCK_CHILD (set, oset);
3741 /* XXX could use js.j_firstj here */
3742 for (i = 0; i < js.j_jobslots; i++)
3745 jobs[i]->state = JDEAD;
3749 UNBLOCK_CHILD (oset);
3752 /* Mark all dead jobs as notified, so delete_job () cleans them out
3753 of the job table properly. POSIX.2 says we need to save the
3754 status of the last CHILD_MAX jobs, so we count the number of dead
3755 jobs and mark only enough as notified to save CHILD_MAX statuses. */
3757 mark_dead_jobs_as_notified (force)
3760 register int i, ndead, ndeadproc;
3763 if (js.j_jobslots == 0)
3766 BLOCK_CHILD (set, oset);
3768 /* If FORCE is non-zero, we don't have to keep CHILD_MAX statuses
3769 around; just run through the array. */
3772 /* XXX could use js.j_firstj here */
3773 for (i = 0; i < js.j_jobslots; i++)
3775 if (jobs[i] && DEADJOB (i) && (interactive_shell || (find_last_pid (i, 0) != last_asynchronous_pid)))
3776 jobs[i]->flags |= J_NOTIFIED;
3778 UNBLOCK_CHILD (oset);
3782 /* Mark enough dead jobs as notified to keep CHILD_MAX processes left in the
3783 array with the corresponding not marked as notified. This is a better
3784 way to avoid pid aliasing and reuse problems than keeping the POSIX-
3785 mandated CHILD_MAX jobs around. delete_job() takes care of keeping the
3786 bgpids list regulated. */
3788 /* Count the number of dead jobs */
3789 /* XXX could use js.j_firstj here */
3790 for (i = ndead = ndeadproc = 0; i < js.j_jobslots; i++)
3793 if (i < js.j_firstj && jobs[i])
3794 itrace("mark_dead_jobs_as_notified: job %d non-null before js.j_firstj (%d)", i, js.j_firstj);
3796 if (jobs[i] && DEADJOB (i))
3799 ndeadproc += processes_in_job (i);
3804 if (ndeadproc != js.c_reaped)
3805 itrace("mark_dead_jobs_as_notified: ndeadproc (%d) != js.c_reaped (%d)", ndeadproc, js.c_reaped);
3806 if (ndead != js.j_ndead)
3807 itrace("mark_dead_jobs_as_notified: ndead (%d) != js.j_ndead (%d)", ndead, js.j_ndead);
3810 if (js.c_childmax < 0)
3811 js.c_childmax = getmaxchild ();
3812 if (js.c_childmax < 0)
3813 js.c_childmax = DEFAULT_CHILD_MAX;
3815 /* Don't do anything if the number of dead processes is less than CHILD_MAX
3816 and we're not forcing a cleanup. */
3817 if (ndeadproc <= js.c_childmax)
3819 UNBLOCK_CHILD (oset);
3824 itrace("mark_dead_jobs_as_notified: child_max = %d ndead = %d ndeadproc = %d", js.c_childmax, ndead, ndeadproc);
3827 /* Mark enough dead jobs as notified that we keep CHILD_MAX jobs in
3828 the list. This isn't exactly right yet; changes need to be made
3829 to stop_pipeline so we don't mark the newer jobs after we've
3830 created CHILD_MAX slots in the jobs array. This needs to be
3831 integrated with a way to keep the jobs array from growing without
3832 bound. Maybe we wrap back around to 0 after we reach some max
3833 limit, and there are sufficient job slots free (keep track of total
3834 size of jobs array (js.j_jobslots) and running count of number of jobs
3835 in jobs array. Then keep a job index corresponding to the `oldest job'
3836 and start this loop there, wrapping around as necessary. In effect,
3837 we turn the list into a circular buffer. */
3838 /* XXX could use js.j_firstj here */
3839 for (i = 0; i < js.j_jobslots; i++)
3841 if (jobs[i] && DEADJOB (i) && (interactive_shell || (find_last_pid (i, 0) != last_asynchronous_pid)))
3844 if (i < js.j_firstj && jobs[i])
3845 itrace("mark_dead_jobs_as_notified: job %d non-null before js.j_firstj (%d)", i, js.j_firstj);
3847 /* If marking this job as notified would drop us down below
3848 child_max, don't mark it so we can keep at least child_max
3849 statuses. XXX -- need to check what Posix actually says
3850 about keeping statuses. */
3851 if ((ndeadproc -= processes_in_job (i)) <= js.c_childmax)
3853 jobs[i]->flags |= J_NOTIFIED;
3857 UNBLOCK_CHILD (oset);
3860 /* Here to allow other parts of the shell (like the trap stuff) to
3861 unfreeze the jobs list. */
3863 unfreeze_jobs_list ()
3865 jobs_list_frozen = 0;
3868 /* Allow or disallow job control to take place. Returns the old value
3871 set_job_control (arg)
3879 /* If we're turning on job control, reset pipeline_pgrp so make_child will
3880 put new child processes into the right pgrp */
3881 if (job_control != old && job_control)
3887 /* Turn off all traces of job control. This is run by children of the shell
3888 which are going to do shellsy things, like wait (), etc. */
3890 without_job_control ()
3892 stop_making_children ();
3894 #if defined (PGRP_PIPE)
3895 pipe_close (pgrp_pipe);
3897 delete_all_jobs (0);
3898 set_job_control (0);
3901 /* If this shell is interactive, terminate all stopped jobs and
3902 restore the original terminal process group. This is done
3903 before the `exec' builtin calls shell_execve. */
3907 if (interactive_shell) /* XXX - should it be interactive? */
3909 terminate_stopped_jobs ();
3911 if (original_pgrp >= 0)
3912 give_terminal_to (original_pgrp, 1);
3915 if (original_pgrp >= 0)
3916 setpgid (0, original_pgrp);
3919 /* Restart job control by closing shell tty and reinitializing. This is
3920 called after an exec fails in an interactive shell and we do not exit. */
3922 restart_job_control ()
3924 if (shell_tty != -1)
3926 initialize_job_control (0);
3929 /* Set the handler to run when the shell receives a SIGCHLD signal. */
3931 set_sigchld_handler ()
3933 set_signal_handler (SIGCHLD, sigchld_handler);
3936 #if defined (PGRP_PIPE)
3937 /* Read from the read end of a pipe. This is how the process group leader
3938 blocks until all of the processes in a pipeline have been made. */
3953 while (read (pp[0], &ch, 1) == -1 && errno == EINTR)
3958 /* Close the read and write ends of PP, an array of file descriptors. */
3972 /* Functional interface closes our local-to-job-control pipes. */
3976 pipe_close (pgrp_pipe);
3979 #endif /* PGRP_PIPE */