1 /* jobs.c - functions that make children, remember them, and handle their termination. */
3 /* This file works with both POSIX and BSD systems. It implements job
6 /* Copyright (C) 1989-2013 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
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.
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.
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/>.
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 #if defined (HAVE_SYS_PARAM_H)
49 #include <sys/param.h>
52 #if defined (BUFFERED_INPUT)
56 /* Need to include this up here for *_TTY_DRIVER definitions. */
59 /* Define this if your output is getting swallowed. It's a no-op on
60 machines with the termio or termios tty drivers. */
61 /* #define DRAIN_OUTPUT */
63 /* For the TIOCGPGRP and TIOCSPGRP ioctl parameters on HP-UX */
64 #if defined (hpux) && !defined (TERMIOS_TTY_DRIVER)
66 #endif /* hpux && !TERMIOS_TTY_DRIVER */
72 #include "execute_cmd.h"
75 #include "builtins/builtext.h"
76 #include "builtins/common.h"
82 #if !defined (HAVE_KILLPG)
83 extern int killpg
__P((pid_t
, int));
86 #if !DEFAULT_CHILD_MAX
87 # define DEFAULT_CHILD_MAX 32
91 # define MAX_CHILD_MAX 8192
95 #define MAX_JOBS_IN_ARRAY 4096 /* production */
97 #define MAX_JOBS_IN_ARRAY 128 /* testing */
100 /* Flag values for second argument to delete_job */
101 #define DEL_WARNSTOPPED 1 /* warn about deleting stopped jobs */
102 #define DEL_NOBGPID 2 /* don't add pgrp leader to bgpids */
104 /* Take care of system dependencies that must be handled when waiting for
105 children. The arguments to the WAITPID macro match those to the Posix.1
106 waitpid() function. */
108 #if defined (ultrix) && defined (mips) && defined (_POSIX_VERSION)
109 # define WAITPID(pid, statusp, options) \
110 wait3 ((union wait *)statusp, options, (struct rusage *)0)
112 # if defined (_POSIX_VERSION) || defined (HAVE_WAITPID)
113 # define WAITPID(pid, statusp, options) \
114 waitpid ((pid_t)pid, statusp, options)
116 # if defined (HAVE_WAIT3)
117 # define WAITPID(pid, statusp, options) \
118 wait3 (statusp, options, (struct rusage *)0)
120 # define WAITPID(pid, statusp, options) \
121 wait3 (statusp, options, (int *)0)
122 # endif /* HAVE_WAIT3 */
123 # endif /* !_POSIX_VERSION && !HAVE_WAITPID*/
124 #endif /* !(Ultrix && mips && _POSIX_VERSION) */
126 /* getpgrp () varies between systems. Even systems that claim to be
127 Posix.1 compatible lie sometimes (Ultrix, SunOS4, apollo). */
128 #if defined (GETPGRP_VOID)
129 # define getpgid(p) getpgrp ()
131 # define getpgid(p) getpgrp (p)
132 #endif /* !GETPGRP_VOID */
134 /* If the system needs it, REINSTALL_SIGCHLD_HANDLER will reinstall the
135 handler for SIGCHLD. */
136 #if defined (MUST_REINSTALL_SIGHANDLERS)
137 # define REINSTALL_SIGCHLD_HANDLER signal (SIGCHLD, sigchld_handler)
139 # define REINSTALL_SIGCHLD_HANDLER
140 #endif /* !MUST_REINSTALL_SIGHANDLERS */
142 /* Some systems let waitpid(2) tell callers about stopped children. */
143 #if !defined (WCONTINUED) || defined (WCONTINUED_BROKEN)
145 # define WCONTINUED 0
147 #if !defined (WIFCONTINUED)
148 # define WIFCONTINUED(s) (0)
151 /* The number of additional slots to allocate when we run out. */
154 typedef int sh_job_map_func_t
__P((JOB
*, int, int, int));
156 /* Variables used here but defined in other files. */
157 extern int subshell_environment
, line_number
;
158 extern int posixly_correct
, shell_level
;
159 extern int last_command_exit_value
, last_command_exit_signal
;
160 extern int loop_level
, breaking
;
161 extern int executing_list
;
162 extern int sourcelevel
;
163 extern int running_trap
;
164 extern sh_builtin_func_t
*this_shell_builtin
;
165 extern char *shell_name
, *this_command_name
;
166 extern sigset_t top_level_mask
;
167 extern procenv_t wait_intr_buf
;
168 extern int wait_signal_received
;
169 extern WORD_LIST
*subst_assign_varlist
;
171 static struct jobstats zerojs
= { -1L, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, NO_JOB
, NO_JOB
, 0, 0 };
172 struct jobstats js
= { -1L, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, NO_JOB
, NO_JOB
, 0, 0 };
174 struct bgpids bgpids
= { 0, 0, 0 };
176 /* The array of known jobs. */
177 JOB
**jobs
= (JOB
**)NULL
;
180 /* The number of slots currently allocated to JOBS. */
184 /* The controlling tty for this shell. */
187 /* The shell's process group. */
188 pid_t shell_pgrp
= NO_PID
;
190 /* The terminal's process group. */
191 pid_t terminal_pgrp
= NO_PID
;
193 /* The process group of the shell's parent. */
194 pid_t original_pgrp
= NO_PID
;
196 /* The process group of the pipeline currently being made. */
197 pid_t pipeline_pgrp
= (pid_t
)0;
199 #if defined (PGRP_PIPE)
200 /* Pipes which each shell uses to communicate with the process group leader
201 until all of the processes in a pipeline have been started. Then the
202 process leader is allowed to continue. */
203 int pgrp_pipe
[2] = { -1, -1 };
207 /* The job which is current; i.e. the one that `%+' stands for. */
208 int current_job
= NO_JOB
;
210 /* The previous job; i.e. the one that `%-' stands for. */
211 int previous_job
= NO_JOB
;
214 /* Last child made by the shell. */
215 volatile pid_t last_made_pid
= NO_PID
;
217 /* Pid of the last asynchronous child. */
218 volatile pid_t last_asynchronous_pid
= NO_PID
;
220 /* The pipeline currently being built. */
221 PROCESS
*the_pipeline
= (PROCESS
*)NULL
;
223 /* If this is non-zero, do job control. */
226 /* Call this when you start making children. */
227 int already_making_children
= 0;
229 /* If this is non-zero, $LINES and $COLUMNS are reset after every process
230 exits from get_tty_state(). */
231 int check_window_size
= CHECKWINSIZE_DEFAULT
;
233 /* Functions local to this file. */
235 static sighandler wait_sigint_handler
__P((int));
236 static sighandler sigchld_handler
__P((int));
237 static sighandler sigcont_sighandler
__P((int));
238 static sighandler sigstop_sighandler
__P((int));
240 static int waitchld
__P((pid_t
, int));
242 static PROCESS
*find_pipeline
__P((pid_t
, int, int *));
243 static PROCESS
*find_process
__P((pid_t
, int, int *));
245 static char *current_working_directory
__P((void));
246 static char *job_working_directory
__P((void));
247 static char *j_strsignal
__P((int));
248 static char *printable_job_status
__P((int, PROCESS
*, int));
250 static PROCESS
*find_last_proc
__P((int, int));
251 static pid_t find_last_pid
__P((int, int));
253 static int set_new_line_discipline
__P((int));
254 static int map_over_jobs
__P((sh_job_map_func_t
*, int, int));
255 static int job_last_stopped
__P((int));
256 static int job_last_running
__P((int));
257 static int most_recent_job_in_state
__P((int, JOB_STATE
));
258 static int find_job
__P((pid_t
, int, PROCESS
**));
259 static int print_job
__P((JOB
*, int, int, int));
260 static int process_exit_status
__P((WAIT
));
261 static int process_exit_signal
__P((WAIT
));
262 static int set_job_status_and_cleanup
__P((int));
264 static WAIT job_signal_status
__P((int));
265 static WAIT raw_job_exit_status
__P((int));
267 static void notify_of_job_status
__P((void));
268 static void reset_job_indices
__P((void));
269 static void cleanup_dead_jobs
__P((void));
270 static int processes_in_job
__P((int));
271 static void realloc_jobs_list
__P((void));
272 static int compact_jobs_list
__P((int));
273 static int discard_pipeline
__P((PROCESS
*));
274 static void add_process
__P((char *, pid_t
));
275 static void print_pipeline
__P((PROCESS
*, int, int, FILE *));
276 static void pretty_print_job
__P((int, int, FILE *));
277 static void set_current_job
__P((int));
278 static void reset_current
__P((void));
279 static void set_job_running
__P((int));
280 static void setjstatus
__P((int));
281 static int maybe_give_terminal_to
__P((pid_t
, pid_t
, int));
282 static void mark_all_jobs_as_dead
__P((void));
283 static void mark_dead_jobs_as_notified
__P((int));
284 static void restore_sigint_handler
__P((void));
285 #if defined (PGRP_PIPE)
286 static void pipe_read
__P((int *));
289 static struct pidstat
*bgp_alloc
__P((pid_t
, int));
290 static struct pidstat
*bgp_add
__P((pid_t
, int));
291 static int bgp_delete
__P((pid_t
));
292 static void bgp_clear
__P((void));
293 static int bgp_search
__P((pid_t
));
294 static void bgp_prune
__P((void));
296 #if defined (ARRAY_VARS)
297 static int *pstatuses
; /* list of pipeline statuses */
301 /* Used to synchronize between wait_for and other functions and the SIGCHLD
304 static int queue_sigchld
;
306 #define QUEUE_SIGCHLD(os) (os) = sigchld, queue_sigchld++
308 #define UNQUEUE_SIGCHLD(os) \
311 if (queue_sigchld == 0 && os != sigchld) \
315 static SigHandler
*old_tstp
, *old_ttou
, *old_ttin
;
316 static SigHandler
*old_cont
= (SigHandler
*)SIG_DFL
;
318 /* A place to temporarily save the current pipeline. */
319 static PROCESS
*saved_pipeline
;
320 static int saved_already_making_children
;
322 /* Set this to non-zero whenever you don't want the jobs list to change at
323 all: no jobs deleted and no status change notifications. This is used,
324 for example, when executing SIGCHLD traps, which may run arbitrary
326 static int jobs_list_frozen
;
328 static char retcode_name_buffer
[64];
330 #if !defined (_POSIX_VERSION)
332 /* These are definitions to map POSIX 1003.1 functions onto existing BSD
333 library functions and system calls. */
334 #define setpgid(pid, pgrp) setpgrp (pid, pgrp)
335 #define tcsetpgrp(fd, pgrp) ioctl ((fd), TIOCSPGRP, &(pgrp))
343 /* ioctl will handle setting errno correctly. */
344 if (ioctl (fd
, TIOCGPGRP
, &pgrp
) < 0)
349 #endif /* !_POSIX_VERSION */
351 /* Initialize the global job stats structure and other bookkeeping variables */
358 /* Return the working directory for the current process. Unlike
359 job_working_directory, this does not call malloc (), nor do any
360 of the functions it calls. This is so that it can safely be called
361 from a signal handler. */
363 current_working_directory ()
366 static char d
[PATH_MAX
];
368 dir
= get_string_value ("PWD");
370 if (dir
== 0 && the_current_working_directory
&& no_symbolic_links
)
371 dir
= the_current_working_directory
;
375 dir
= getcwd (d
, sizeof(d
));
380 return (dir
== 0) ? "<unknown>" : dir
;
383 /* Return the working directory for the current process. */
385 job_working_directory ()
389 dir
= get_string_value ("PWD");
391 return (savestring (dir
));
393 dir
= get_working_directory ("job-working-directory");
397 return (savestring ("<unknown>"));
403 if (already_making_children
)
406 already_making_children
= 1;
411 stop_making_children ()
413 already_making_children
= 0;
417 cleanup_the_pipeline ()
422 BLOCK_CHILD (set
, oset
);
423 disposer
= the_pipeline
;
424 the_pipeline
= (PROCESS
*)NULL
;
425 UNBLOCK_CHILD (oset
);
428 discard_pipeline (disposer
);
432 save_pipeline (clear
)
435 saved_pipeline
= the_pipeline
;
437 the_pipeline
= (PROCESS
*)NULL
;
438 saved_already_making_children
= already_making_children
;
442 restore_pipeline (discard
)
445 PROCESS
*old_pipeline
;
447 old_pipeline
= the_pipeline
;
448 the_pipeline
= saved_pipeline
;
449 already_making_children
= saved_already_making_children
;
450 if (discard
&& old_pipeline
)
451 discard_pipeline (old_pipeline
);
454 /* Start building a pipeline. */
460 cleanup_the_pipeline ();
462 #if defined (PGRP_PIPE)
463 sh_closepipe (pgrp_pipe
);
467 #if defined (PGRP_PIPE)
470 if (pipe (pgrp_pipe
) == -1)
471 sys_error (_("start_pipeline: pgrp pipe"));
476 /* Stop building a pipeline. Install the process list in the job array.
477 This returns the index of the newly installed job.
478 DEFERRED is a command structure to be executed upon satisfactory
479 execution exit of this pipeline. */
481 stop_pipeline (async
, deferred
)
489 BLOCK_CHILD (set
, oset
);
491 #if defined (PGRP_PIPE)
492 /* The parent closes the process group synchronization pipe. */
493 sh_closepipe (pgrp_pipe
);
496 cleanup_dead_jobs ();
498 if (js
.j_jobslots
== 0)
500 js
.j_jobslots
= JOB_SLOTS
;
501 jobs
= (JOB
**)xmalloc (js
.j_jobslots
* sizeof (JOB
*));
503 /* Now blank out these new entries. */
504 for (i
= 0; i
< js
.j_jobslots
; i
++)
505 jobs
[i
] = (JOB
*)NULL
;
507 js
.j_firstj
= js
.j_lastj
= js
.j_njobs
= 0;
510 /* Scan from the last slot backward, looking for the next free one. */
511 /* XXX - revisit this interactive assumption */
512 /* XXX - this way for now */
515 for (i
= js
.j_jobslots
; i
; i
--)
522 /* This wraps around, but makes it inconvenient to extend the array */
523 for (i
= js
.j_lastj
+1; i
!= js
.j_lastj
; i
++)
525 if (i
>= js
.j_jobslots
)
533 /* This doesn't wrap around yet. */
534 for (i
= js
.j_lastj
? js
.j_lastj
+ 1 : js
.j_lastj
; i
< js
.j_jobslots
; i
++)
540 /* Do we need more room? */
542 /* First try compaction */
543 if ((interactive_shell
== 0 || subshell_environment
) && i
== js
.j_jobslots
&& js
.j_jobslots
>= MAX_JOBS_IN_ARRAY
)
544 i
= compact_jobs_list (0);
546 /* If we can't compact, reallocate */
547 if (i
== js
.j_jobslots
)
549 js
.j_jobslots
+= JOB_SLOTS
;
550 jobs
= (JOB
**)xrealloc (jobs
, (js
.j_jobslots
* sizeof (JOB
*)));
552 for (j
= i
; j
< js
.j_jobslots
; j
++)
553 jobs
[j
] = (JOB
*)NULL
;
556 /* Add the current pipeline to the job list. */
560 int any_running
, any_stopped
, n
;
562 newjob
= (JOB
*)xmalloc (sizeof (JOB
));
564 for (n
= 1, p
= the_pipeline
; p
->next
!= the_pipeline
; n
++, p
= p
->next
)
566 p
->next
= (PROCESS
*)NULL
;
567 newjob
->pipe
= REVERSE_LIST (the_pipeline
, PROCESS
*);
568 for (p
= newjob
->pipe
; p
->next
; p
= p
->next
)
570 p
->next
= newjob
->pipe
;
572 the_pipeline
= (PROCESS
*)NULL
;
573 newjob
->pgrp
= pipeline_pgrp
;
578 /* Flag to see if in another pgrp. */
580 newjob
->flags
|= J_JOBCONTROL
;
582 /* Set the state of this pipeline. */
584 any_running
= any_stopped
= 0;
587 any_running
|= PRUNNING (p
);
588 any_stopped
|= PSTOPPED (p
);
591 while (p
!= newjob
->pipe
);
593 newjob
->state
= any_running
? JRUNNING
: (any_stopped
? JSTOPPED
: JDEAD
);
594 newjob
->wd
= job_working_directory ();
595 newjob
->deferred
= deferred
;
597 newjob
->j_cleanup
= (sh_vptrfunc_t
*)NULL
;
598 newjob
->cleanarg
= (PTR_T
) NULL
;
601 if (newjob
->state
== JDEAD
&& (newjob
->flags
& J_FOREGROUND
))
603 if (newjob
->state
== JDEAD
)
605 js
.c_reaped
+= n
; /* wouldn't have been done since this was not part of a job */
614 newjob
= (JOB
*)NULL
;
617 js
.j_lastmade
= newjob
;
623 newjob
->flags
&= ~J_FOREGROUND
;
624 newjob
->flags
|= J_ASYNC
;
625 js
.j_lastasync
= newjob
;
633 newjob
->flags
|= J_FOREGROUND
;
635 * !!!!! NOTE !!!!! (chet@ins.cwru.edu)
637 * The currently-accepted job control wisdom says to set the
638 * terminal's process group n+1 times in an n-step pipeline:
639 * once in the parent and once in each child. This is where
640 * the parent gives it away.
642 * Don't give the terminal away if this shell is an asynchronous
646 if (job_control
&& newjob
->pgrp
&& (subshell_environment
&SUBSHELL_ASYNC
) == 0)
647 maybe_give_terminal_to (shell_pgrp
, newjob
->pgrp
, 0);
651 stop_making_children ();
652 UNBLOCK_CHILD (oset
);
653 return (newjob
? i
: js
.j_current
);
656 /* Functions to manage the list of exited background pids whose status has
659 static struct pidstat
*
660 bgp_alloc (pid
, status
)
666 ps
= (struct pidstat
*)xmalloc (sizeof (struct pidstat
));
669 ps
->next
= (struct pidstat
*)0;
673 static struct pidstat
*
674 bgp_add (pid
, status
)
680 ps
= bgp_alloc (pid
, status
);
682 if (bgpids
.list
== 0)
684 bgpids
.list
= bgpids
.end
= ps
;
685 bgpids
.npid
= 0; /* just to make sure */
689 bgpids
.end
->next
= ps
;
694 if (bgpids
.npid
> js
.c_childmax
)
704 struct pidstat
*prev
, *p
;
706 for (prev
= p
= bgpids
.list
; p
; prev
= p
, p
= p
->next
)
709 prev
->next
= p
->next
; /* remove from list */
714 return 0; /* not found */
717 itrace("bgp_delete: deleting %d", pid
);
720 /* Housekeeping in the border cases. */
721 if (p
== bgpids
.list
)
722 bgpids
.list
= bgpids
.list
->next
;
723 else if (p
== bgpids
.end
)
727 if (bgpids
.npid
== 0)
728 bgpids
.list
= bgpids
.end
= 0;
729 else if (bgpids
.npid
== 1)
730 bgpids
.end
= bgpids
.list
; /* just to make sure */
736 /* Clear out the list of saved statuses */
740 struct pidstat
*ps
, *p
;
742 for (ps
= bgpids
.list
; ps
; )
748 bgpids
.list
= bgpids
.end
= 0;
752 /* Search for PID in the list of saved background pids; return its status if
753 found. If not found, return -1. */
760 for (ps
= bgpids
.list
; ps
; ps
= ps
->next
)
771 while (bgpids
.npid
> js
.c_childmax
)
774 bgpids
.list
= bgpids
.list
->next
;
780 /* Reset the values of js.j_lastj and js.j_firstj after one or both have
781 been deleted. The caller should check whether js.j_njobs is 0 before
782 calling this. This wraps around, but the rest of the code does not. At
783 this point, it should not matter. */
789 if (jobs
[js
.j_firstj
] == 0)
792 if (old
>= js
.j_jobslots
)
793 old
= js
.j_jobslots
- 1;
794 while (js
.j_firstj
!= old
)
796 if (js
.j_firstj
>= js
.j_jobslots
)
798 if (jobs
[js
.j_firstj
] || js
.j_firstj
== old
) /* needed if old == 0 */
802 if (js
.j_firstj
== old
)
803 js
.j_firstj
= js
.j_lastj
= js
.j_njobs
= 0;
805 if (jobs
[js
.j_lastj
] == 0)
810 while (js
.j_lastj
!= old
)
813 js
.j_lastj
= js
.j_jobslots
- 1;
814 if (jobs
[js
.j_lastj
] || js
.j_lastj
== old
) /* needed if old == js.j_jobslots */
818 if (js
.j_lastj
== old
)
819 js
.j_firstj
= js
.j_lastj
= js
.j_njobs
= 0;
823 /* Delete all DEAD jobs that the user had received notification about. */
830 if (js
.j_jobslots
== 0 || jobs_list_frozen
)
835 /* XXX could use js.j_firstj and js.j_lastj here */
836 for (i
= 0; i
< js
.j_jobslots
; i
++)
839 if (i
< js
.j_firstj
&& jobs
[i
])
840 itrace("cleanup_dead_jobs: job %d non-null before js.j_firstj (%d)", i
, js
.j_firstj
);
841 if (i
> js
.j_lastj
&& jobs
[i
])
842 itrace("cleanup_dead_jobs: job %d non-null after js.j_lastj (%d)", i
, js
.j_lastj
);
845 if (jobs
[i
] && DEADJOB (i
) && IS_NOTIFIED (i
))
849 #if defined (COPROCESS_SUPPORT)
857 processes_in_job (job
)
870 while (p
!= jobs
[job
]->pipe
);
882 job
= find_job (pid
, 0, &p
);
886 itrace ("delete_old_job: found pid %d in job %d with state %d", pid
, job
, jobs
[job
]->state
);
888 if (JOBSTATE (job
) == JDEAD
)
889 delete_job (job
, DEL_NOBGPID
);
892 internal_warning (_("forked pid %d appears in running job %d"), pid
, job
);
899 /* Reallocate and compress the jobs list. This returns with a jobs array
900 whose size is a multiple of JOB_SLOTS and can hold the current number of
901 jobs. Heuristics are used to minimize the number of new reallocs. */
906 int nsize
, i
, j
, ncur
, nprev
;
909 ncur
= nprev
= NO_JOB
;
910 nsize
= ((js
.j_njobs
+ JOB_SLOTS
- 1) / JOB_SLOTS
);
912 i
= js
.j_njobs
% JOB_SLOTS
;
913 if (i
== 0 || i
> (JOB_SLOTS
>> 1))
916 BLOCK_CHILD (set
, oset
);
917 nlist
= (js
.j_jobslots
== nsize
) ? jobs
: (JOB
**) xmalloc (nsize
* sizeof (JOB
*));
919 js
.c_reaped
= js
.j_ndead
= 0;
920 for (i
= j
= 0; i
< js
.j_jobslots
; i
++)
923 if (i
== js
.j_current
)
925 if (i
== js
.j_previous
)
927 nlist
[j
++] = jobs
[i
];
928 if (jobs
[i
]->state
== JDEAD
)
931 js
.c_reaped
+= processes_in_job (i
);
936 itrace ("realloc_jobs_list: resize jobs list from %d to %d", js
.j_jobslots
, nsize
);
937 itrace ("realloc_jobs_list: j_lastj changed from %d to %d", js
.j_lastj
, (j
> 0) ? j
- 1 : 0);
938 itrace ("realloc_jobs_list: j_njobs changed from %d to %d", js
.j_njobs
, j
);
939 itrace ("realloc_jobs_list: js.j_ndead %d js.c_reaped %d", js
.j_ndead
, js
.c_reaped
);
943 js
.j_lastj
= (j
> 0) ? j
- 1 : 0;
945 js
.j_jobslots
= nsize
;
947 /* Zero out remaining slots in new jobs list */
948 for ( ; j
< nsize
; j
++)
949 nlist
[j
] = (JOB
*)NULL
;
960 js
.j_previous
= nprev
;
962 /* Need to reset these */
963 if (js
.j_current
== NO_JOB
|| js
.j_previous
== NO_JOB
|| js
.j_current
> js
.j_lastj
|| js
.j_previous
> js
.j_lastj
)
967 itrace ("realloc_jobs_list: reset js.j_current (%d) and js.j_previous (%d)", js
.j_current
, js
.j_previous
);
970 UNBLOCK_CHILD (oset
);
973 /* Compact the jobs list by removing dead jobs. Assume that we have filled
974 the jobs array to some predefined maximum. Called when the shell is not
975 the foreground process (subshell_environment != 0). Returns the first
976 available slot in the compacted list. If that value is js.j_jobslots, then
977 the list needs to be reallocated. The jobs array may be in new memory if
978 this returns > 0 and < js.j_jobslots. FLAGS is reserved for future use. */
980 compact_jobs_list (flags
)
983 if (js
.j_jobslots
== 0 || jobs_list_frozen
)
984 return js
.j_jobslots
;
987 realloc_jobs_list ();
990 itrace("compact_jobs_list: returning %d", (js
.j_lastj
|| jobs
[js
.j_lastj
]) ? js
.j_lastj
+ 1 : 0);
993 return ((js
.j_lastj
|| jobs
[js
.j_lastj
]) ? js
.j_lastj
+ 1 : 0);
996 /* Delete the job at INDEX from the job list. Must be called
997 with SIGCHLD blocked. */
999 delete_job (job_index
, dflags
)
1000 int job_index
, dflags
;
1006 if (js
.j_jobslots
== 0 || jobs_list_frozen
)
1009 if ((dflags
& DEL_WARNSTOPPED
) && subshell_environment
== 0 && STOPPED (job_index
))
1010 internal_warning (_("deleting stopped job %d with process group %ld"), job_index
+1, (long)jobs
[job_index
]->pgrp
);
1011 temp
= jobs
[job_index
];
1015 if ((dflags
& DEL_NOBGPID
) == 0)
1017 proc
= find_last_proc (job_index
, 0);
1018 /* Could do this just for J_ASYNC jobs, but we save all. */
1020 bgp_add (proc
->pid
, process_exit_status (proc
->status
));
1023 jobs
[job_index
] = (JOB
*)NULL
;
1024 if (temp
== js
.j_lastmade
)
1026 else if (temp
== js
.j_lastasync
)
1030 ndel
= discard_pipeline (temp
->pipe
);
1032 js
.c_injobs
-= ndel
;
1033 if (temp
->state
== JDEAD
)
1035 js
.c_reaped
-= ndel
;
1037 if (js
.c_reaped
< 0)
1040 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
);
1047 dispose_command (temp
->deferred
);
1052 if (js
.j_njobs
== 0)
1053 js
.j_firstj
= js
.j_lastj
= 0;
1054 else if (jobs
[js
.j_firstj
] == 0 || jobs
[js
.j_lastj
] == 0)
1055 reset_job_indices ();
1057 if (job_index
== js
.j_current
|| job_index
== js
.j_previous
)
1061 /* Must be called with SIGCHLD blocked. */
1063 nohup_job (job_index
)
1068 if (js
.j_jobslots
== 0)
1071 if (temp
= jobs
[job_index
])
1072 temp
->flags
|= J_NOHUP
;
1075 /* Get rid of the data structure associated with a process chain. */
1077 discard_pipeline (chain
)
1078 register PROCESS
*chain
;
1080 register PROCESS
*this, *next
;
1088 FREE (this->command
);
1093 while (this != chain
);
1098 /* Add this process to the chain being built in the_pipeline.
1099 NAME is the command string that will be exec'ed later.
1100 PID is the process id of the child. */
1102 add_process (name
, pid
)
1108 #if defined (RECYCLES_PIDS)
1110 p
= find_process (pid
, 0, &j
);
1115 internal_warning (_("add_process: process %5ld (%s) in the_pipeline"), (long)p
->pid
, p
->command
);
1118 internal_warning (_("add_process: pid %5ld (%s) marked as still alive"), (long)p
->pid
, p
->command
);
1119 p
->running
= PS_RECYCLED
; /* mark as recycled */
1123 t
= (PROCESS
*)xmalloc (sizeof (PROCESS
));
1124 t
->next
= the_pipeline
;
1126 WSTATUS (t
->status
) = 0;
1127 t
->running
= PS_RUNNING
;
1136 while (p
->next
!= t
->next
)
1142 /* Create a (dummy) PROCESS with NAME, PID, and STATUS, and make it the last
1143 process in jobs[JID]->pipe. Used by the lastpipe code. */
1145 append_process (name
, pid
, status
, jid
)
1153 t
= (PROCESS
*)xmalloc (sizeof (PROCESS
));
1154 t
->next
= (PROCESS
*)NULL
;
1156 /* set process exit status using offset discovered by configure */
1157 t
->status
= (status
& 0xff) << WEXITSTATUS_OFFSET
;
1158 t
->running
= PS_DONE
;
1161 js
.c_reaped
++; /* XXX */
1163 for (p
= jobs
[jid
]->pipe
; p
->next
!= jobs
[jid
]->pipe
; p
= p
->next
)
1166 t
->next
= jobs
[jid
]->pipe
;
1170 /* Take the last job and make it the first job. Must be called with
1173 rotate_the_pipeline ()
1177 if (the_pipeline
->next
== the_pipeline
)
1179 for (p
= the_pipeline
; p
->next
!= the_pipeline
; p
= p
->next
)
1184 /* Reverse the order of the processes in the_pipeline. Must be called with
1187 reverse_the_pipeline ()
1191 if (the_pipeline
->next
== the_pipeline
)
1194 for (p
= the_pipeline
; p
->next
!= the_pipeline
; p
= p
->next
)
1196 p
->next
= (PROCESS
*)NULL
;
1198 n
= REVERSE_LIST (the_pipeline
, PROCESS
*);
1201 for (p
= the_pipeline
; p
->next
; p
= p
->next
)
1203 p
->next
= the_pipeline
;
1207 /* Map FUNC over the list of jobs. If FUNC returns non-zero,
1208 then it is time to stop mapping, and that is the return value
1209 for map_over_jobs. FUNC is called with a JOB, arg1, arg2,
1212 map_over_jobs (func
, arg1
, arg2
)
1213 sh_job_map_func_t
*func
;
1220 if (js
.j_jobslots
== 0)
1223 BLOCK_CHILD (set
, oset
);
1225 /* XXX could use js.j_firstj here */
1226 for (i
= result
= 0; i
< js
.j_jobslots
; i
++)
1229 if (i
< js
.j_firstj
&& jobs
[i
])
1230 itrace("map_over_jobs: job %d non-null before js.j_firstj (%d)", i
, js
.j_firstj
);
1231 if (i
> js
.j_lastj
&& jobs
[i
])
1232 itrace("map_over_jobs: job %d non-null after js.j_lastj (%d)", i
, js
.j_lastj
);
1236 result
= (*func
)(jobs
[i
], arg1
, arg2
, i
);
1242 UNBLOCK_CHILD (oset
);
1247 /* Cause all the jobs in the current pipeline to exit. */
1249 terminate_current_pipeline ()
1251 if (pipeline_pgrp
&& pipeline_pgrp
!= shell_pgrp
)
1253 killpg (pipeline_pgrp
, SIGTERM
);
1254 killpg (pipeline_pgrp
, SIGCONT
);
1258 /* Cause all stopped jobs to exit. */
1260 terminate_stopped_jobs ()
1264 /* XXX could use js.j_firstj here */
1265 for (i
= 0; i
< js
.j_jobslots
; i
++)
1267 if (jobs
[i
] && STOPPED (i
))
1269 killpg (jobs
[i
]->pgrp
, SIGTERM
);
1270 killpg (jobs
[i
]->pgrp
, SIGCONT
);
1275 /* Cause all jobs, running or stopped, to receive a hangup signal. If
1276 a job is marked J_NOHUP, don't send the SIGHUP. */
1282 /* XXX could use js.j_firstj here */
1283 for (i
= 0; i
< js
.j_jobslots
; i
++)
1287 if (jobs
[i
]->flags
& J_NOHUP
)
1289 killpg (jobs
[i
]->pgrp
, SIGHUP
);
1291 killpg (jobs
[i
]->pgrp
, SIGCONT
);
1297 kill_current_pipeline ()
1299 stop_making_children ();
1303 /* Return the pipeline that PID belongs to. Note that the pipeline
1304 doesn't have to belong to a job. Must be called with SIGCHLD blocked.
1305 If JOBP is non-null, return the index of the job containing PID. */
1307 find_pipeline (pid
, alive_only
, jobp
)
1310 int *jobp
; /* index into jobs list or NO_JOB */
1315 /* See if this process is in the pipeline that we are building. */
1323 /* Return it if we found it. Don't ever return a recycled pid. */
1324 if (p
->pid
== pid
&& ((alive_only
== 0 && PRECYCLED(p
) == 0) || PALIVE(p
)))
1329 while (p
!= the_pipeline
);
1332 job
= find_job (pid
, alive_only
, &p
);
1335 return (job
== NO_JOB
) ? (PROCESS
*)NULL
: jobs
[job
]->pipe
;
1338 /* Return the PROCESS * describing PID. If JOBP is non-null return the index
1339 into the jobs array of the job containing PID. Must be called with
1342 find_process (pid
, alive_only
, jobp
)
1345 int *jobp
; /* index into jobs list or NO_JOB */
1349 p
= find_pipeline (pid
, alive_only
, jobp
);
1350 while (p
&& p
->pid
!= pid
)
1355 /* Return the job index that PID belongs to, or NO_JOB if it doesn't
1356 belong to any job. Must be called with SIGCHLD blocked. */
1358 find_job (pid
, alive_only
, procp
)
1366 /* XXX could use js.j_firstj here, and should check js.j_lastj */
1367 for (i
= 0; i
< js
.j_jobslots
; i
++)
1370 if (i
< js
.j_firstj
&& jobs
[i
])
1371 itrace("find_job: job %d non-null before js.j_firstj (%d)", i
, js
.j_firstj
);
1372 if (i
> js
.j_lastj
&& jobs
[i
])
1373 itrace("find_job: job %d non-null after js.j_lastj (%d)", i
, js
.j_lastj
);
1381 if (p
->pid
== pid
&& ((alive_only
== 0 && PRECYCLED(p
) == 0) || PALIVE(p
)))
1390 while (p
!= jobs
[i
]->pipe
);
1397 /* Find a job given a PID. If BLOCK is non-zero, block SIGCHLD as
1398 required by find_job. */
1400 get_job_by_pid (pid
, block
)
1408 BLOCK_CHILD (set
, oset
);
1410 job
= find_job (pid
, 0, NULL
);
1413 UNBLOCK_CHILD (oset
);
1418 /* Print descriptive information about the job with leader pid PID. */
1426 BLOCK_CHILD (set
, oset
);
1428 job
= find_job (pid
, 0, NULL
);
1431 fprintf (stderr
, "[%d] %ld\n", job
+ 1, (long)pid
);
1433 programming_error (_("describe_pid: %ld: no such pid"), (long)pid
);
1435 UNBLOCK_CHILD (oset
);
1447 x
= retcode_name_buffer
;
1448 sprintf (x
, _("Signal %d"), s
);
1454 printable_job_status (j
, p
, format
)
1464 if (STOPPED (j
) && format
== 0)
1466 if (posixly_correct
== 0 || p
== 0 || (WIFSTOPPED (p
->status
) == 0))
1467 temp
= _("Stopped");
1470 temp
= retcode_name_buffer
;
1471 sprintf (temp
, _("Stopped(%s)"), signal_name (WSTOPSIG (p
->status
)));
1474 else if (RUNNING (j
))
1475 temp
= _("Running");
1478 if (WIFSTOPPED (p
->status
))
1479 temp
= j_strsignal (WSTOPSIG (p
->status
));
1480 else if (WIFSIGNALED (p
->status
))
1481 temp
= j_strsignal (WTERMSIG (p
->status
));
1482 else if (WIFEXITED (p
->status
))
1484 temp
= retcode_name_buffer
;
1485 es
= WEXITSTATUS (p
->status
);
1487 strcpy (temp
, _("Done"));
1488 else if (posixly_correct
)
1489 sprintf (temp
, _("Done(%d)"), es
);
1491 sprintf (temp
, _("Exit %d"), es
);
1494 temp
= _("Unknown status");
1500 /* This is the way to print out information on a job if you
1501 know the index. FORMAT is:
1503 JLIST_NORMAL) [1]+ Running emacs
1504 JLIST_LONG ) [1]+ 2378 Running emacs
1505 -1 ) [1]+ 2378 emacs
1507 JLIST_NORMAL) [1]+ Stopped ls | more
1508 JLIST_LONG ) [1]+ 2369 Stopped ls
1511 Just list the pid of the process group leader (really
1514 Use format JLIST_NORMAL, but list only jobs about which
1515 the user has not been notified. */
1517 /* Print status for pipeline P. If JOB_INDEX is >= 0, it is the index into
1518 the JOBS array corresponding to this pipeline. FORMAT is as described
1519 above. Must be called with SIGCHLD blocked.
1521 If you're printing a pipeline that's not in the jobs array, like the
1522 current pipeline as it's being created, pass -1 for JOB_INDEX */
1524 print_pipeline (p
, job_index
, format
, stream
)
1526 int job_index
, format
;
1529 PROCESS
*first
, *last
, *show
;
1530 int es
, name_padding
;
1537 while (last
->next
!= first
)
1543 fprintf (stream
, format
? " " : " |");
1545 if (format
!= JLIST_STANDARD
)
1546 fprintf (stream
, "%5ld", (long)p
->pid
);
1548 fprintf (stream
, " ");
1550 if (format
> -1 && job_index
>= 0)
1552 show
= format
? p
: last
;
1553 temp
= printable_job_status (job_index
, show
, format
);
1559 if (show
->running
== first
->running
&&
1560 WSTATUS (show
->status
) == WSTATUS (first
->status
))
1564 temp
= (char *)NULL
;
1569 fprintf (stream
, "%s", temp
);
1573 es
= 2; /* strlen ("| ") */
1574 name_padding
= LONGEST_SIGNAL_DESC
- es
;
1576 fprintf (stream
, "%*s", name_padding
, "");
1578 if ((WIFSTOPPED (show
->status
) == 0) &&
1579 (WIFCONTINUED (show
->status
) == 0) &&
1580 WIFCORED (show
->status
))
1581 fprintf (stream
, _("(core dumped) "));
1585 if (p
!= first
&& format
)
1586 fprintf (stream
, "| ");
1589 fprintf (stream
, "%s", p
->command
);
1591 if (p
== last
&& job_index
>= 0)
1593 temp
= current_working_directory ();
1595 if (RUNNING (job_index
) && (IS_FOREGROUND (job_index
) == 0))
1596 fprintf (stream
, " &");
1598 if (strcmp (temp
, jobs
[job_index
]->wd
) != 0)
1600 _(" (wd: %s)"), polite_directory_format (jobs
[job_index
]->wd
));
1603 if (format
|| (p
== last
))
1605 /* We need to add a CR only if this is an interactive shell, and
1606 we're reporting the status of a completed job asynchronously.
1607 We can't really check whether this particular job is being
1608 reported asynchronously, so just add the CR if the shell is
1609 currently interactive and asynchronous notification is enabled. */
1610 if (asynchronous_notification
&& interactive
)
1611 fprintf (stream
, "\r\n");
1613 fprintf (stream
, "\n");
1623 /* Print information to STREAM about jobs[JOB_INDEX] according to FORMAT.
1624 Must be called with SIGCHLD blocked or queued with queue_sigchld */
1626 pretty_print_job (job_index
, format
, stream
)
1627 int job_index
, format
;
1630 register PROCESS
*p
;
1632 /* Format only pid information about the process group leader? */
1633 if (format
== JLIST_PID_ONLY
)
1635 fprintf (stream
, "%ld\n", (long)jobs
[job_index
]->pipe
->pid
);
1639 if (format
== JLIST_CHANGED_ONLY
)
1641 if (IS_NOTIFIED (job_index
))
1643 format
= JLIST_STANDARD
;
1646 if (format
!= JLIST_NONINTERACTIVE
)
1647 fprintf (stream
, "[%d]%c ", job_index
+ 1,
1648 (job_index
== js
.j_current
) ? '+':
1649 (job_index
== js
.j_previous
) ? '-' : ' ');
1651 if (format
== JLIST_NONINTERACTIVE
)
1652 format
= JLIST_LONG
;
1654 p
= jobs
[job_index
]->pipe
;
1656 print_pipeline (p
, job_index
, format
, stream
);
1658 /* We have printed information about this job. When the job's
1659 status changes, waitchld () sets the notification flag to 0. */
1660 jobs
[job_index
]->flags
|= J_NOTIFIED
;
1664 print_job (job
, format
, state
, job_index
)
1666 int format
, state
, job_index
;
1668 if (state
== -1 || (JOB_STATE
)state
== job
->state
)
1669 pretty_print_job (job_index
, format
, stdout
);
1674 list_one_job (job
, format
, ignore
, job_index
)
1676 int format
, ignore
, job_index
;
1678 pretty_print_job (job_index
, format
, stdout
);
1682 list_stopped_jobs (format
)
1685 cleanup_dead_jobs ();
1686 map_over_jobs (print_job
, format
, (int)JSTOPPED
);
1690 list_running_jobs (format
)
1693 cleanup_dead_jobs ();
1694 map_over_jobs (print_job
, format
, (int)JRUNNING
);
1697 /* List jobs. If FORMAT is non-zero, then the long form of the information
1698 is printed, else just a short version. */
1700 list_all_jobs (format
)
1703 cleanup_dead_jobs ();
1704 map_over_jobs (print_job
, format
, -1);
1707 /* Fork, handling errors. Returns the pid of the newly made child, or 0.
1708 COMMAND is just for remembering the name of the command; we don't do
1709 anything else with it. ASYNC_P says what to do with the tty. If
1710 non-zero, then don't give it away. */
1712 make_child (command
, async_p
)
1720 /* XXX - block SIGTERM here and unblock in child after fork resets the
1721 set of pending signals? */
1723 sigaddset (&set
, SIGCHLD
);
1724 sigaddset (&set
, SIGINT
);
1725 sigemptyset (&oset
);
1726 sigprocmask (SIG_BLOCK
, &set
, &oset
);
1732 #if defined (BUFFERED_INPUT)
1733 /* If default_buffered_input is active, we are reading a script. If
1734 the command is asynchronous, we have already duplicated /dev/null
1735 as fd 0, but have not changed the buffered stream corresponding to
1736 the old fd 0. We don't want to sync the stream in this case. */
1737 if (default_buffered_input
!= -1 &&
1738 (!async_p
|| default_buffered_input
> 0))
1739 sync_buffered_stream (default_buffered_input
);
1740 #endif /* BUFFERED_INPUT */
1744 /* Create the child, handle severe errors. Retry on EAGAIN. */
1745 while ((pid
= fork ()) < 0 && errno
== EAGAIN
&& forksleep
< FORKSLEEP_MAX
)
1748 /* If we can't create any children, try to reap some dead ones. */
1751 sys_error ("fork: retry");
1754 if (sleep (forksleep
) != 0)
1766 /* Kill all of the processes in the current pipeline. */
1767 terminate_current_pipeline ();
1769 /* Discard the current pipeline, if any. */
1771 kill_current_pipeline ();
1773 last_command_exit_value
= EX_NOEXEC
;
1774 throw_to_top_level (); /* Reset signals, etc. */
1779 /* In the child. Give this child the right process group, set the
1780 signals to the default state for a new process. */
1784 #if defined (BUFFERED_INPUT)
1785 /* Close default_buffered_input if it's > 0. We don't close it if it's
1786 0 because that's the file descriptor used when redirecting input,
1787 and it's wrong to close the file in that case. */
1788 unset_bash_input (0);
1789 #endif /* BUFFERED_INPUT */
1791 /* Restore top-level signal mask. */
1792 sigprocmask (SIG_SETMASK
, &top_level_mask
, (sigset_t
*)NULL
);
1796 /* All processes in this pipeline belong in the same
1799 if (pipeline_pgrp
== 0) /* This is the first child. */
1800 pipeline_pgrp
= mypid
;
1802 /* Check for running command in backquotes. */
1803 if (pipeline_pgrp
== shell_pgrp
)
1804 ignore_tty_job_signals ();
1806 default_tty_job_signals ();
1808 /* Set the process group before trying to mess with the terminal's
1809 process group. This is mandated by POSIX. */
1810 /* This is in accordance with the Posix 1003.1 standard,
1811 section B.7.2.4, which says that trying to set the terminal
1812 process group with tcsetpgrp() to an unused pgrp value (like
1813 this would have for the first child) is an error. Section
1814 B.4.3.3, p. 237 also covers this, in the context of job control
1816 if (setpgid (mypid
, pipeline_pgrp
) < 0)
1817 sys_error (_("child setpgid (%ld to %ld)"), (long)mypid
, (long)pipeline_pgrp
);
1819 /* By convention (and assumption above), if
1820 pipeline_pgrp == shell_pgrp, we are making a child for
1821 command substitution.
1822 In this case, we don't want to give the terminal to the
1823 shell's process group (we could be in the middle of a
1824 pipeline, for example). */
1825 if (async_p
== 0 && pipeline_pgrp
!= shell_pgrp
&& ((subshell_environment
&SUBSHELL_ASYNC
) == 0))
1826 give_terminal_to (pipeline_pgrp
, 0);
1828 #if defined (PGRP_PIPE)
1829 if (pipeline_pgrp
== mypid
)
1830 pipe_read (pgrp_pipe
);
1833 else /* Without job control... */
1835 if (pipeline_pgrp
== 0)
1836 pipeline_pgrp
= shell_pgrp
;
1838 /* If these signals are set to SIG_DFL, we encounter the curious
1839 situation of an interactive ^Z to a running process *working*
1840 and stopping the process, but being unable to do anything with
1841 that process to change its state. On the other hand, if they
1842 are set to SIG_IGN, jobs started from scripts do not stop when
1843 the shell running the script gets a SIGTSTP and stops. */
1845 default_tty_job_signals ();
1848 #if defined (PGRP_PIPE)
1849 /* Release the process group pipe, since our call to setpgid ()
1850 is done. The last call to sh_closepipe is done in stop_pipeline. */
1851 sh_closepipe (pgrp_pipe
);
1852 #endif /* PGRP_PIPE */
1855 /* Don't set last_asynchronous_pid in the child */
1857 last_asynchronous_pid
= mypid
; /* XXX */
1860 #if defined (RECYCLES_PIDS)
1861 if (last_asynchronous_pid
== mypid
)
1862 /* Avoid pid aliasing. 1 seems like a safe, unusual pid value. */
1863 last_asynchronous_pid
= 1;
1868 /* In the parent. Remember the pid of the child just created
1869 as the proper pgrp if this is the first child. */
1873 if (pipeline_pgrp
== 0)
1875 pipeline_pgrp
= pid
;
1876 /* Don't twiddle terminal pgrps in the parent! This is the bug,
1877 not the good thing of twiddling them in the child! */
1878 /* give_terminal_to (pipeline_pgrp, 0); */
1880 /* This is done on the recommendation of the Rationale section of
1881 the POSIX 1003.1 standard, where it discusses job control and
1882 shells. It is done to avoid possible race conditions. (Ref.
1883 1003.1 Rationale, section B.4.3.3, page 236). */
1884 setpgid (pid
, pipeline_pgrp
);
1888 if (pipeline_pgrp
== 0)
1889 pipeline_pgrp
= shell_pgrp
;
1892 /* Place all processes into the jobs array regardless of the
1893 state of job_control. */
1894 add_process (command
, pid
);
1897 last_asynchronous_pid
= pid
;
1898 #if defined (RECYCLES_PIDS)
1899 else if (last_asynchronous_pid
== pid
)
1900 /* Avoid pid aliasing. 1 seems like a safe, unusual pid value. */
1901 last_asynchronous_pid
= 1;
1904 /* Delete the saved status for any job containing this PID in case it's
1906 delete_old_job (pid
);
1908 /* Perform the check for pid reuse unconditionally. Some systems reuse
1909 PIDs before giving a process CHILD_MAX/_SC_CHILD_MAX unique ones. */
1910 bgp_delete (pid
); /* new process, discard any saved status */
1912 last_made_pid
= pid
;
1918 /* Unblock SIGINT and SIGCHLD unless creating a pipeline, in which case
1919 SIGCHLD remains blocked until all commands in the pipeline have been
1921 sigprocmask (SIG_SETMASK
, &oset
, (sigset_t
*)NULL
);
1927 /* These two functions are called only in child processes. */
1929 ignore_tty_job_signals ()
1931 set_signal_handler (SIGTSTP
, SIG_IGN
);
1932 set_signal_handler (SIGTTIN
, SIG_IGN
);
1933 set_signal_handler (SIGTTOU
, SIG_IGN
);
1937 default_tty_job_signals ()
1939 set_signal_handler (SIGTSTP
, SIG_DFL
);
1940 set_signal_handler (SIGTTIN
, SIG_DFL
);
1941 set_signal_handler (SIGTTOU
, SIG_DFL
);
1944 /* When we end a job abnormally, or if we stop a job, we set the tty to the
1945 state kept in here. When a job ends normally, we set the state in here
1946 to the state of the tty. */
1948 static TTYSTRUCT shell_tty_info
;
1950 #if defined (NEW_TTY_DRIVER)
1951 static struct tchars shell_tchars
;
1952 static struct ltchars shell_ltchars
;
1953 #endif /* NEW_TTY_DRIVER */
1955 #if defined (NEW_TTY_DRIVER) && defined (DRAIN_OUTPUT)
1956 /* Since the BSD tty driver does not allow us to change the tty modes
1957 while simultaneously waiting for output to drain and preserving
1958 typeahead, we have to drain the output ourselves before calling
1959 ioctl. We cheat by finding the length of the output queue, and
1960 using select to wait for an appropriate length of time. This is
1961 a hack, and should be labeled as such (it's a hastily-adapted
1962 mutation of a `usleep' implementation). It's only reason for
1963 existing is the flaw in the BSD tty driver. */
1965 static int ttspeeds
[] =
1967 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200,
1968 1800, 2400, 4800, 9600, 19200, 38400
1975 register int delay
= ttspeeds
[ospeed
];
1981 while ((ioctl (fd
, TIOCOUTQ
, &n
) == 0) && n
)
1983 if (n
> (delay
/ 100))
1987 n
*= 10; /* 2 bits more for conservativeness. */
1988 tv
.tv_sec
= n
/ delay
;
1989 tv
.tv_usec
= ((n
% delay
) * 1000000) / delay
;
1990 select (fd
, (fd_set
*)0, (fd_set
*)0, (fd_set
*)0, &tv
);
1996 #endif /* NEW_TTY_DRIVER && DRAIN_OUTPUT */
1998 /* Return the fd from which we are actually getting input. */
1999 #define input_tty() (shell_tty != -1) ? shell_tty : fileno (stderr)
2001 /* Fill the contents of shell_tty_info with the current tty info. */
2010 #if defined (NEW_TTY_DRIVER)
2011 ioctl (tty
, TIOCGETP
, &shell_tty_info
);
2012 ioctl (tty
, TIOCGETC
, &shell_tchars
);
2013 ioctl (tty
, TIOCGLTC
, &shell_ltchars
);
2014 #endif /* NEW_TTY_DRIVER */
2016 #if defined (TERMIO_TTY_DRIVER)
2017 ioctl (tty
, TCGETA
, &shell_tty_info
);
2018 #endif /* TERMIO_TTY_DRIVER */
2020 #if defined (TERMIOS_TTY_DRIVER)
2021 if (tcgetattr (tty
, &shell_tty_info
) < 0)
2024 /* Only print an error message if we're really interactive at
2027 sys_error ("[%ld: %d (%d)] tcgetattr", (long)getpid (), shell_level
, tty
);
2031 #endif /* TERMIOS_TTY_DRIVER */
2032 if (check_window_size
)
2033 get_new_window_size (0, (int *)0, (int *)0);
2038 /* Make the current tty use the state in shell_tty_info. */
2047 #if defined (NEW_TTY_DRIVER)
2048 # if defined (DRAIN_OUTPUT)
2049 draino (tty
, shell_tty_info
.sg_ospeed
);
2050 # endif /* DRAIN_OUTPUT */
2051 ioctl (tty
, TIOCSETN
, &shell_tty_info
);
2052 ioctl (tty
, TIOCSETC
, &shell_tchars
);
2053 ioctl (tty
, TIOCSLTC
, &shell_ltchars
);
2054 #endif /* NEW_TTY_DRIVER */
2056 #if defined (TERMIO_TTY_DRIVER)
2057 ioctl (tty
, TCSETAW
, &shell_tty_info
);
2058 #endif /* TERMIO_TTY_DRIVER */
2060 #if defined (TERMIOS_TTY_DRIVER)
2061 if (tcsetattr (tty
, TCSADRAIN
, &shell_tty_info
) < 0)
2063 /* Only print an error message if we're really interactive at
2066 sys_error ("[%ld: %d (%d)] tcsetattr", (long)getpid (), shell_level
, tty
);
2069 #endif /* TERMIOS_TTY_DRIVER */
2074 /* Given an index into the jobs array JOB, return the PROCESS struct of the last
2075 process in that job's pipeline. This is the one whose exit status
2076 counts. Must be called with SIGCHLD blocked or queued. */
2078 find_last_proc (job
, block
)
2082 register PROCESS
*p
;
2086 BLOCK_CHILD (set
, oset
);
2088 p
= jobs
[job
]->pipe
;
2089 while (p
&& p
->next
!= jobs
[job
]->pipe
)
2093 UNBLOCK_CHILD (oset
);
2099 find_last_pid (job
, block
)
2105 p
= find_last_proc (job
, block
);
2106 /* Possible race condition here. */
2110 /* Wait for a particular child of the shell to finish executing.
2111 This low-level function prints an error message if PID is not
2112 a child of this shell. It returns -1 if it fails, or whatever
2113 wait_for returns otherwise. If the child is not found in the
2114 jobs table, it returns 127. */
2116 wait_for_single_pid (pid
)
2119 register PROCESS
*child
;
2123 BLOCK_CHILD (set
, oset
);
2124 child
= find_pipeline (pid
, 0, (int *)NULL
);
2125 UNBLOCK_CHILD (oset
);
2129 r
= bgp_search (pid
);
2136 internal_error (_("wait: pid %ld is not a child of this shell"), (long)pid
);
2142 /* POSIX.2: if we just waited for a job, we can remove it from the jobs
2144 BLOCK_CHILD (set
, oset
);
2145 job
= find_job (pid
, 0, NULL
);
2146 if (job
!= NO_JOB
&& jobs
[job
] && DEADJOB (job
))
2147 jobs
[job
]->flags
|= J_NOTIFIED
;
2148 UNBLOCK_CHILD (oset
);
2150 /* If running in posix mode, remove the job from the jobs table immediately */
2151 if (posixly_correct
)
2153 cleanup_dead_jobs ();
2160 /* Wait for all of the background processes started by this shell to finish. */
2162 wait_for_background_pids ()
2164 register int i
, r
, waited_for
;
2168 for (waited_for
= 0;;)
2170 BLOCK_CHILD (set
, oset
);
2172 /* find first running job; if none running in foreground, break */
2173 /* XXX could use js.j_firstj and js.j_lastj here */
2174 for (i
= 0; i
< js
.j_jobslots
; i
++)
2177 if (i
< js
.j_firstj
&& jobs
[i
])
2178 itrace("wait_for_background_pids: job %d non-null before js.j_firstj (%d)", i
, js
.j_firstj
);
2179 if (i
> js
.j_lastj
&& jobs
[i
])
2180 itrace("wait_for_background_pids: job %d non-null after js.j_lastj (%d)", i
, js
.j_lastj
);
2182 if (jobs
[i
] && RUNNING (i
) && IS_FOREGROUND (i
) == 0)
2185 if (i
== js
.j_jobslots
)
2187 UNBLOCK_CHILD (oset
);
2191 /* now wait for the last pid in that job. */
2192 pid
= find_last_pid (i
, 0);
2193 UNBLOCK_CHILD (oset
);
2195 errno
= 0; /* XXX */
2196 r
= wait_for_single_pid (pid
);
2199 /* If we're mistaken about job state, compensate. */
2200 if (errno
== ECHILD
)
2201 mark_all_jobs_as_dead ();
2207 /* POSIX.2 says the shell can discard the statuses of all completed jobs if
2208 `wait' is called with no arguments. */
2209 mark_dead_jobs_as_notified (1);
2210 cleanup_dead_jobs ();
2214 /* Make OLD_SIGINT_HANDLER the SIGINT signal handler. */
2215 #define INVALID_SIGNAL_HANDLER (SigHandler *)wait_for_background_pids
2216 static SigHandler
*old_sigint_handler
= INVALID_SIGNAL_HANDLER
;
2218 static int wait_sigint_received
;
2219 static int child_caught_sigint
;
2220 static int waiting_for_child
;
2223 restore_sigint_handler ()
2225 if (old_sigint_handler
!= INVALID_SIGNAL_HANDLER
)
2227 set_signal_handler (SIGINT
, old_sigint_handler
);
2228 old_sigint_handler
= INVALID_SIGNAL_HANDLER
;
2229 waiting_for_child
= 0;
2233 /* Handle SIGINT while we are waiting for children in a script to exit.
2234 The `wait' builtin should be interruptible, but all others should be
2235 effectively ignored (i.e. not cause the shell to exit). */
2237 wait_sigint_handler (sig
)
2240 SigHandler
*sigint_handler
;
2242 if (interrupt_immediately
||
2243 (this_shell_builtin
&& this_shell_builtin
== wait_builtin
))
2245 last_command_exit_value
= 128+SIGINT
;
2246 restore_sigint_handler ();
2247 /* If we got a SIGINT while in `wait', and SIGINT is trapped, do
2248 what POSIX.2 says (see builtins/wait.def for more info). */
2249 if (this_shell_builtin
&& this_shell_builtin
== wait_builtin
&&
2250 signal_is_trapped (SIGINT
) &&
2251 ((sigint_handler
= trap_to_sighandler (SIGINT
)) == trap_handler
))
2253 trap_handler (SIGINT
); /* set pending_traps[SIGINT] */
2254 wait_signal_received
= SIGINT
;
2255 if (interrupt_immediately
)
2257 interrupt_immediately
= 0;
2258 longjmp (wait_intr_buf
, 1);
2261 /* Let CHECK_WAIT_INTR handle it in wait_for/waitchld */
2264 else if (interrupt_immediately
)
2269 else /* wait_builtin but signal not trapped, treat as interrupt */
2270 kill (getpid (), SIGINT
);
2273 /* XXX - should this be interrupt_state? If it is, the shell will act
2274 as if it got the SIGINT interrupt. */
2275 if (waiting_for_child
)
2276 wait_sigint_received
= 1;
2279 last_command_exit_value
= 128+SIGINT
;
2280 restore_sigint_handler ();
2281 kill (getpid (), SIGINT
);
2284 /* Otherwise effectively ignore the SIGINT and allow the running job to
2290 process_exit_signal (status
)
2293 return (WIFSIGNALED (status
) ? WTERMSIG (status
) : 0);
2297 process_exit_status (status
)
2300 if (WIFSIGNALED (status
))
2301 return (128 + WTERMSIG (status
));
2302 else if (WIFSTOPPED (status
) == 0)
2303 return (WEXITSTATUS (status
));
2305 return (EXECUTION_SUCCESS
);
2309 job_signal_status (job
)
2312 register PROCESS
*p
;
2315 p
= jobs
[job
]->pipe
;
2319 if (WIFSIGNALED(s
) || WIFSTOPPED(s
))
2323 while (p
!= jobs
[job
]->pipe
);
2328 /* Return the exit status of the last process in the pipeline for job JOB.
2329 This is the exit status of the entire job. */
2331 raw_job_exit_status (job
)
2334 register PROCESS
*p
;
2341 p
= jobs
[job
]->pipe
;
2344 if (WSTATUS (p
->status
) != EXECUTION_SUCCESS
)
2345 fail
= WSTATUS(p
->status
);
2348 while (p
!= jobs
[job
]->pipe
);
2349 WSTATUS (ret
) = fail
;
2353 for (p
= jobs
[job
]->pipe
; p
->next
!= jobs
[job
]->pipe
; p
= p
->next
)
2358 /* Return the exit status of job JOB. This is the exit status of the last
2359 (rightmost) process in the job's pipeline, modified if the job was killed
2360 by a signal or stopped. */
2362 job_exit_status (job
)
2365 return (process_exit_status (raw_job_exit_status (job
)));
2369 job_exit_signal (job
)
2372 return (process_exit_signal (raw_job_exit_status (job
)));
2375 #define FIND_CHILD(pid, child) \
2378 child = find_pipeline (pid, 0, (int *)NULL); \
2381 give_terminal_to (shell_pgrp, 0); \
2382 UNBLOCK_CHILD (oset); \
2383 internal_error (_("wait_for: No record of process %ld"), (long)pid); \
2384 restore_sigint_handler (); \
2385 return (termination_state = 127); \
2390 /* Wait for pid (one of our children) to terminate, then
2391 return the termination state. Returns 127 if PID is not found in
2392 the jobs table. Returns -1 if waitchld() returns -1, indicating
2393 that there are no unwaited-for child processes. */
2398 int job
, termination_state
, r
;
2400 register PROCESS
*child
;
2403 /* In the case that this code is interrupted, and we longjmp () out of it,
2404 we are relying on the code in throw_to_top_level () to restore the
2405 top-level signal mask. */
2407 BLOCK_CHILD (set
, oset
);
2409 /* Ignore interrupts while waiting for a job run without job control
2410 to finish. We don't want the shell to exit if an interrupt is
2411 received, only if one of the jobs run is killed via SIGINT. If
2412 job control is not set, the job will be run in the same pgrp as
2413 the shell, and the shell will see any signals the job gets. In
2414 fact, we want this set every time the waiting shell and the waited-
2415 for process are in the same process group, including command
2418 /* This is possibly a race condition -- should it go in stop_pipeline? */
2419 wait_sigint_received
= child_caught_sigint
= 0;
2420 if (job_control
== 0 || (subshell_environment
&SUBSHELL_COMSUB
))
2422 old_sigint_handler
= set_signal_handler (SIGINT
, wait_sigint_handler
);
2423 waiting_for_child
= 0;
2424 if (old_sigint_handler
== SIG_IGN
)
2425 set_signal_handler (SIGINT
, old_sigint_handler
);
2428 termination_state
= last_command_exit_value
;
2430 if (interactive
&& job_control
== 0)
2432 /* Check for terminating signals and exit the shell if we receive one */
2435 /* Check for a trapped signal interrupting the wait builtin and jump out */
2438 /* If we say wait_for (), then we have a record of this child somewhere.
2439 If it and none of its peers are running, don't call waitchld(). */
2445 FIND_CHILD (pid
, child
);
2447 /* If this child is part of a job, then we are really waiting for the
2448 job to finish. Otherwise, we are waiting for the child to finish.
2449 We check for JDEAD in case the job state has been set by waitchld
2450 after receipt of a SIGCHLD. */
2452 job
= find_job (pid
, 0, NULL
);
2454 /* waitchld() takes care of setting the state of the job. If the job
2455 has already exited before this is called, sigchld_handler will have
2456 called waitchld and the state will be set to JDEAD. */
2458 if (pid
== ANY_PID
|| PRUNNING(child
) || (job
!= NO_JOB
&& RUNNING (job
)))
2460 #if defined (WAITPID_BROKEN) /* SCOv4 */
2461 sigset_t suspend_set
;
2462 sigemptyset (&suspend_set
);
2463 sigsuspend (&suspend_set
);
2464 #else /* !WAITPID_BROKEN */
2465 # if defined (MUST_UNBLOCK_CHLD)
2466 struct sigaction act
, oact
;
2467 sigset_t nullset
, chldset
;
2469 sigemptyset (&nullset
);
2470 sigemptyset (&chldset
);
2471 sigprocmask (SIG_SETMASK
, &nullset
, &chldset
);
2472 act
.sa_handler
= SIG_DFL
;
2473 sigemptyset (&act
.sa_mask
);
2474 sigemptyset (&oact
.sa_mask
);
2476 # if defined (SA_RESTART)
2477 act
.sa_flags
|= SA_RESTART
;
2479 sigaction (SIGCHLD
, &act
, &oact
);
2480 # endif /* MUST_UNBLOCK_CHLD */
2482 waiting_for_child
++;
2483 r
= waitchld (pid
, 1); /* XXX */
2484 waiting_for_child
--;
2485 # if defined (MUST_UNBLOCK_CHLD)
2486 sigaction (SIGCHLD
, &oact
, (struct sigaction
*)NULL
);
2487 sigprocmask (SIG_SETMASK
, &chldset
, (sigset_t
*)NULL
);
2490 if (r
== -1 && errno
== ECHILD
&& this_shell_builtin
== wait_builtin
)
2492 termination_state
= -1;
2493 /* XXX - restore sigint handler here? */
2494 goto wait_for_return
;
2497 /* If child is marked as running, but waitpid() returns -1/ECHILD,
2498 there is something wrong. Somewhere, wait should have returned
2499 that child's pid. Mark the child as not running and the job,
2500 if it exists, as JDEAD. */
2501 if (r
== -1 && errno
== ECHILD
)
2505 child
->running
= PS_DONE
;
2506 WSTATUS (child
->status
) = 0; /* XXX -- can't find true status */
2508 js
.c_living
= 0; /* no living child processes */
2511 jobs
[job
]->state
= JDEAD
;
2517 termination_state
= -1;
2521 #endif /* WAITPID_BROKEN */
2524 /* If the shell is interactive, and job control is disabled, see
2525 if the foreground process has died due to SIGINT and jump out
2526 of the wait loop if it has. waitchld has already restored the
2527 old SIGINT signal handler. */
2528 if (interactive
&& job_control
== 0)
2530 /* Check for terminating signals and exit the shell if we receive one */
2533 /* Check for a trapped signal interrupting the wait builtin and jump out */
2537 /* XXX - could set child but we don't have a handle on what waitchld
2538 reaps. Leave termination_state alone. */
2539 goto wait_for_return
;
2541 while (PRUNNING (child
) || (job
!= NO_JOB
&& RUNNING (job
)));
2543 /* Restore the original SIGINT signal handler before we return. */
2544 restore_sigint_handler ();
2546 /* The exit state of the command is either the termination state of the
2547 child, or the termination state of the job. If a job, the status
2548 of the last child in the pipeline is the significant one. If the command
2549 or job was terminated by a signal, note that value also. */
2550 termination_state
= (job
!= NO_JOB
) ? job_exit_status (job
)
2551 : process_exit_status (child
->status
);
2552 last_command_exit_signal
= (job
!= NO_JOB
) ? job_exit_signal (job
)
2553 : process_exit_signal (child
->status
);
2556 if ((job
!= NO_JOB
&& JOBSTATE (job
) == JSTOPPED
) || WIFSTOPPED (child
->status
))
2557 termination_state
= 128 + WSTOPSIG (child
->status
);
2559 if (job
== NO_JOB
|| IS_JOBCONTROL (job
))
2561 /* XXX - under what circumstances is a job not present in the jobs
2562 table (job == NO_JOB)?
2563 1. command substitution
2565 In the case of command substitution, at least, it's probably not
2566 the right thing to give the terminal to the shell's process group,
2567 even though there is code in subst.c:command_substitute to work
2571 $PROMPT_COMMAND execution
2572 process substitution
2576 itrace("wait_for: job == NO_JOB, giving the terminal to shell_pgrp (%ld)", (long)shell_pgrp
);
2578 give_terminal_to (shell_pgrp
, 0);
2581 /* If the command did not exit cleanly, or the job is just
2582 being stopped, then reset the tty state back to what it
2583 was before this command. Reset the tty state and notify
2584 the user of the job termination only if the shell is
2585 interactive. Clean up any dead jobs in either case. */
2588 if (interactive_shell
&& subshell_environment
== 0)
2590 /* This used to use `child->status'. That's wrong, however, for
2591 pipelines. `child' is the first process in the pipeline. It's
2592 likely that the process we want to check for abnormal termination
2593 or stopping is the last process in the pipeline, especially if
2594 it's long-lived and the first process is short-lived. Since we
2595 know we have a job here, we can check all the processes in this
2596 job's pipeline and see if one of them stopped or terminated due
2597 to a signal. We might want to change this later to just check
2598 the last process in the pipeline. If no process exits due to a
2599 signal, S is left as the status of the last job in the pipeline. */
2600 s
= job_signal_status (job
);
2602 if (WIFSIGNALED (s
) || WIFSTOPPED (s
))
2606 /* If the current job was stopped or killed by a signal, and
2607 the user has requested it, get a possibly new window size */
2608 if (check_window_size
&& (job
== js
.j_current
|| IS_FOREGROUND (job
)))
2609 get_new_window_size (0, (int *)0, (int *)0);
2614 /* If job control is enabled, the job was started with job
2615 control, the job was the foreground job, and it was killed
2616 by SIGINT, then print a newline to compensate for the kernel
2617 printing the ^C without a trailing newline. */
2618 if (job_control
&& IS_JOBCONTROL (job
) && IS_FOREGROUND (job
) &&
2619 WIFSIGNALED (s
) && WTERMSIG (s
) == SIGINT
)
2621 /* If SIGINT is not trapped and the shell is in a for, while,
2622 or until loop, act as if the shell received SIGINT as
2623 well, so the loop can be broken. This doesn't call the
2624 SIGINT signal handler; maybe it should. */
2625 if (signal_is_trapped (SIGINT
) == 0 && (loop_level
|| (shell_compatibility_level
> 32 && executing_list
)))
2634 else if ((subshell_environment
& (SUBSHELL_COMSUB
|SUBSHELL_PIPE
)) && wait_sigint_received
)
2636 /* If waiting for a job in a subshell started to do command
2637 substitution or to run a pipeline element that consists of
2638 something like a while loop or a for loop, simulate getting
2639 and being killed by the SIGINT to pass the status back to our
2641 s
= job_signal_status (job
);
2643 if (child_caught_sigint
== 0 && signal_is_trapped (SIGINT
) == 0)
2645 UNBLOCK_CHILD (oset
);
2646 old_sigint_handler
= set_signal_handler (SIGINT
, SIG_DFL
);
2647 if (old_sigint_handler
== SIG_IGN
)
2648 restore_sigint_handler ();
2650 kill (getpid (), SIGINT
);
2653 else if (interactive_shell
== 0 && IS_FOREGROUND (job
) && check_window_size
)
2654 get_new_window_size (0, (int *)0, (int *)0);
2656 /* Moved here from set_job_status_and_cleanup, which is in the SIGCHLD
2657 signal handler path */
2658 if (DEADJOB (job
) && IS_FOREGROUND (job
) /*&& subshell_environment == 0*/)
2661 /* If this job is dead, notify the user of the status. If the shell
2662 is interactive, this will display a message on the terminal. If
2663 the shell is not interactive, make sure we turn on the notify bit
2664 so we don't get an unwanted message about the job's termination,
2665 and so delete_job really clears the slot in the jobs table. */
2666 notify_and_cleanup ();
2671 UNBLOCK_CHILD (oset
);
2673 return (termination_state
);
2676 /* Wait for the last process in the pipeline for JOB. Returns whatever
2677 wait_for returns: the last process's termination state or -1 if there
2678 are no unwaited-for child processes or an error occurs. */
2687 BLOCK_CHILD(set
, oset
);
2688 if (JOBSTATE (job
) == JSTOPPED
)
2689 internal_warning (_("wait_for_job: job %d is stopped"), job
+1);
2691 pid
= find_last_pid (job
, 0);
2692 UNBLOCK_CHILD(oset
);
2695 /* POSIX.2: we can remove the job from the jobs table if we just waited
2697 BLOCK_CHILD (set
, oset
);
2698 if (job
!= NO_JOB
&& jobs
[job
] && DEADJOB (job
))
2699 jobs
[job
]->flags
|= J_NOTIFIED
;
2700 UNBLOCK_CHILD (oset
);
2705 /* Wait for any background job started by this shell to finish. Very
2706 similar to wait_for_background_pids(). Returns the exit status of
2707 the next exiting job, -1 if there are no background jobs. The caller
2708 is responsible for translating -1 into the right return value. */
2713 int i
, r
, waited_for
;
2716 if (jobs_list_frozen
)
2719 /* First see if there are any unnotified dead jobs that we can report on */
2720 BLOCK_CHILD (set
, oset
);
2721 for (i
= 0; i
< js
.j_jobslots
; i
++)
2723 if (jobs
[i
] && DEADJOB (i
) && IS_NOTIFIED (i
) == 0)
2726 r
= job_exit_status (i
);
2727 notify_of_job_status (); /* XXX */
2729 #if defined (COPROCESS_SUPPORT)
2732 UNBLOCK_CHILD (oset
);
2736 UNBLOCK_CHILD (oset
);
2738 /* At this point, we have no dead jobs in the jobs table. Wait until we
2739 get one, even if it takes multiple pids exiting. */
2740 for (waited_for
= 0;;)
2742 /* Make sure there is a background job to wait for */
2743 BLOCK_CHILD (set
, oset
);
2744 for (i
= 0; i
< js
.j_jobslots
; i
++)
2745 if (jobs
[i
] && RUNNING (i
) && IS_FOREGROUND (i
) == 0)
2747 if (i
== js
.j_jobslots
)
2749 UNBLOCK_CHILD (oset
);
2753 UNBLOCK_CHILD (oset
);
2760 r
= wait_for (ANY_PID
); /* special sentinel value for wait_for */
2761 if (r
== -1 && errno
== ECHILD
)
2762 mark_all_jobs_as_dead ();
2764 /* Now we see if we have any dead jobs and return the first one */
2765 BLOCK_CHILD (set
, oset
);
2766 for (i
= 0; i
< js
.j_jobslots
; i
++)
2767 if (jobs
[i
] && DEADJOB (i
))
2769 UNBLOCK_CHILD (oset
);
2775 /* Print info about dead jobs, and then delete them from the list
2776 of known jobs. This does not actually delete jobs when the
2777 shell is not interactive, because the dead jobs are not marked
2780 notify_and_cleanup ()
2782 if (jobs_list_frozen
)
2785 if (interactive
|| interactive_shell
== 0 || sourcelevel
)
2786 notify_of_job_status ();
2788 cleanup_dead_jobs ();
2791 /* Make dead jobs disappear from the jobs array without notification.
2792 This is used when the shell is not interactive. */
2796 mark_dead_jobs_as_notified (0);
2797 cleanup_dead_jobs ();
2800 /* Return the next closest (chronologically) job to JOB which is in
2801 STATE. STATE can be JSTOPPED, JRUNNING. NO_JOB is returned if
2802 there is no next recent job. */
2804 most_recent_job_in_state (job
, state
)
2808 register int i
, result
;
2811 BLOCK_CHILD (set
, oset
);
2813 for (result
= NO_JOB
, i
= job
- 1; i
>= 0; i
--)
2815 if (jobs
[i
] && (JOBSTATE (i
) == state
))
2822 UNBLOCK_CHILD (oset
);
2827 /* Return the newest *stopped* job older than JOB, or NO_JOB if not
2830 job_last_stopped (job
)
2833 return (most_recent_job_in_state (job
, JSTOPPED
));
2836 /* Return the newest *running* job older than JOB, or NO_JOB if not
2839 job_last_running (job
)
2842 return (most_recent_job_in_state (job
, JRUNNING
));
2845 /* Make JOB be the current job, and make previous be useful. Must be
2846 called with SIGCHLD blocked. */
2848 set_current_job (job
)
2853 if (js
.j_current
!= job
)
2855 js
.j_previous
= js
.j_current
;
2859 /* First choice for previous job is the old current job. */
2860 if (js
.j_previous
!= js
.j_current
&&
2861 js
.j_previous
!= NO_JOB
&&
2862 jobs
[js
.j_previous
] &&
2863 STOPPED (js
.j_previous
))
2866 /* Second choice: Newest stopped job that is older than
2869 if (STOPPED (js
.j_current
))
2871 candidate
= job_last_stopped (js
.j_current
);
2873 if (candidate
!= NO_JOB
)
2875 js
.j_previous
= candidate
;
2880 /* If we get here, there is either only one stopped job, in which case it is
2881 the current job and the previous job should be set to the newest running
2882 job, or there are only running jobs and the previous job should be set to
2883 the newest running job older than the current job. We decide on which
2884 alternative to use based on whether or not JOBSTATE(js.j_current) is
2887 candidate
= RUNNING (js
.j_current
) ? job_last_running (js
.j_current
)
2888 : job_last_running (js
.j_jobslots
);
2890 if (candidate
!= NO_JOB
)
2892 js
.j_previous
= candidate
;
2896 /* There is only a single job, and it is both `+' and `-'. */
2897 js
.j_previous
= js
.j_current
;
2900 /* Make current_job be something useful, if it isn't already. */
2902 /* Here's the deal: The newest non-running job should be `+', and the
2903 next-newest non-running job should be `-'. If there is only a single
2904 stopped job, the js.j_previous is the newest non-running job. If there
2905 are only running jobs, the newest running job is `+' and the
2906 next-newest running job is `-'. Must be called with SIGCHLD blocked. */
2913 if (js
.j_jobslots
&& js
.j_current
!= NO_JOB
&& jobs
[js
.j_current
] && STOPPED (js
.j_current
))
2914 candidate
= js
.j_current
;
2919 /* First choice: the previous job. */
2920 if (js
.j_previous
!= NO_JOB
&& jobs
[js
.j_previous
] && STOPPED (js
.j_previous
))
2921 candidate
= js
.j_previous
;
2923 /* Second choice: the most recently stopped job. */
2924 if (candidate
== NO_JOB
)
2925 candidate
= job_last_stopped (js
.j_jobslots
);
2927 /* Third choice: the newest running job. */
2928 if (candidate
== NO_JOB
)
2929 candidate
= job_last_running (js
.j_jobslots
);
2932 /* If we found a job to use, then use it. Otherwise, there
2933 are no jobs period. */
2934 if (candidate
!= NO_JOB
)
2935 set_current_job (candidate
);
2937 js
.j_current
= js
.j_previous
= NO_JOB
;
2940 /* Set up the job structures so we know the job and its processes are
2943 set_job_running (job
)
2946 register PROCESS
*p
;
2948 /* Each member of the pipeline is now running. */
2949 p
= jobs
[job
]->pipe
;
2953 if (WIFSTOPPED (p
->status
))
2954 p
->running
= PS_RUNNING
; /* XXX - could be PS_STOPPED */
2957 while (p
!= jobs
[job
]->pipe
);
2959 /* This means that the job is running. */
2960 JOBSTATE (job
) = JRUNNING
;
2963 /* Start a job. FOREGROUND if non-zero says to do that. Otherwise,
2964 start the job in the background. JOB is a zero-based index into
2965 JOBS. Returns -1 if it is unable to start a job, and the return
2966 status of the job otherwise. */
2968 start_job (job
, foreground
)
2969 int job
, foreground
;
2971 register PROCESS
*p
;
2972 int already_running
;
2975 static TTYSTRUCT save_stty
;
2977 BLOCK_CHILD (set
, oset
);
2981 internal_error (_("%s: job has terminated"), this_command_name
);
2982 UNBLOCK_CHILD (oset
);
2986 already_running
= RUNNING (job
);
2988 if (foreground
== 0 && already_running
)
2990 internal_error (_("%s: job %d already in background"), this_command_name
, job
+ 1);
2991 UNBLOCK_CHILD (oset
);
2992 return (0); /* XPG6/SUSv3 says this is not an error */
2995 wd
= current_working_directory ();
2997 /* You don't know about the state of this job. Do you? */
2998 jobs
[job
]->flags
&= ~J_NOTIFIED
;
3002 set_current_job (job
);
3003 jobs
[job
]->flags
|= J_FOREGROUND
;
3006 /* Tell the outside world what we're doing. */
3007 p
= jobs
[job
]->pipe
;
3009 if (foreground
== 0)
3011 /* POSIX.2 says `bg' doesn't give any indication about current or
3013 if (posixly_correct
== 0)
3014 s
= (job
== js
.j_current
) ? "+ ": ((job
== js
.j_previous
) ? "- " : " ");
3017 printf ("[%d]%s", job
+ 1, s
);
3023 p
->command
? p
->command
: "",
3024 p
->next
!= jobs
[job
]->pipe
? " | " : "");
3027 while (p
!= jobs
[job
]->pipe
);
3029 if (foreground
== 0)
3032 if (strcmp (wd
, jobs
[job
]->wd
) != 0)
3033 printf (" (wd: %s)", polite_directory_format (jobs
[job
]->wd
));
3038 if (already_running
== 0)
3039 set_job_running (job
);
3041 /* Save the tty settings before we start the job in the foreground. */
3045 save_stty
= shell_tty_info
;
3046 /* Give the terminal to this job. */
3047 if (IS_JOBCONTROL (job
))
3048 give_terminal_to (jobs
[job
]->pgrp
, 0);
3051 jobs
[job
]->flags
&= ~J_FOREGROUND
;
3053 /* If the job is already running, then don't bother jump-starting it. */
3054 if (already_running
== 0)
3056 jobs
[job
]->flags
|= J_NOTIFIED
;
3057 killpg (jobs
[job
]->pgrp
, SIGCONT
);
3065 pid
= find_last_pid (job
, 0);
3066 UNBLOCK_CHILD (oset
);
3067 st
= wait_for (pid
);
3068 shell_tty_info
= save_stty
;
3075 UNBLOCK_CHILD (oset
);
3080 /* Give PID SIGNAL. This determines what job the pid belongs to (if any).
3081 If PID does belong to a job, and the job is stopped, then CONTinue the
3082 job after giving it SIGNAL. Returns -1 on failure. If GROUP is non-null,
3083 then kill the process group associated with PID. */
3085 kill_pid (pid
, sig
, group
)
3089 register PROCESS
*p
;
3090 int job
, result
, negative
;
3096 group
= negative
= 1;
3101 result
= EXECUTION_SUCCESS
;
3104 BLOCK_CHILD (set
, oset
);
3105 p
= find_pipeline (pid
, 0, &job
);
3109 jobs
[job
]->flags
&= ~J_NOTIFIED
;
3111 /* Kill process in backquotes or one started without job control? */
3113 /* If we're passed a pid < -1, just call killpg and see what happens */
3114 if (negative
&& jobs
[job
]->pgrp
== shell_pgrp
)
3115 result
= killpg (pid
, sig
);
3116 /* If we're killing using job control notification, for example,
3117 without job control active, we have to do things ourselves. */
3118 else if (jobs
[job
]->pgrp
== shell_pgrp
)
3120 p
= jobs
[job
]->pipe
;
3123 if (PALIVE (p
) == 0)
3124 continue; /* avoid pid recycling problem */
3126 if (PEXITED (p
) && (sig
== SIGTERM
|| sig
== SIGHUP
))
3127 kill (p
->pid
, SIGCONT
);
3130 while (p
!= jobs
[job
]->pipe
);
3134 result
= killpg (jobs
[job
]->pgrp
, sig
);
3135 if (p
&& STOPPED (job
) && (sig
== SIGTERM
|| sig
== SIGHUP
))
3136 killpg (jobs
[job
]->pgrp
, SIGCONT
);
3137 /* If we're continuing a stopped job via kill rather than bg or
3138 fg, emulate the `bg' behavior. */
3139 if (p
&& STOPPED (job
) && (sig
== SIGCONT
))
3141 set_job_running (job
);
3142 jobs
[job
]->flags
&= ~J_FOREGROUND
;
3143 jobs
[job
]->flags
|= J_NOTIFIED
;
3148 result
= killpg (pid
, sig
);
3150 UNBLOCK_CHILD (oset
);
3153 result
= kill (pid
, sig
);
3158 /* sigchld_handler () flushes at least one of the children that we are
3159 waiting for. It gets run when we have gotten a SIGCHLD signal. */
3161 sigchld_handler (sig
)
3167 REINSTALL_SIGCHLD_HANDLER
;
3170 if (queue_sigchld
== 0)
3171 n
= waitchld (-1, 0);
3176 /* waitchld() reaps dead or stopped children. It's called by wait_for and
3177 sigchld_handler, and runs until there aren't any children terminating any
3179 If BLOCK is 1, this is to be a blocking wait for a single child, although
3180 an arriving SIGCHLD could cause the wait to be non-blocking. It returns
3181 the number of children reaped, or -1 if there are no unwaited-for child
3184 waitchld (wpid
, block
)
3192 int call_set_current
, last_stopped_job
, job
, children_exited
, waitpid_flags
;
3193 static int wcontinued
= WCONTINUED
; /* run-time fix for glibc problem */
3195 call_set_current
= children_exited
= 0;
3196 last_stopped_job
= NO_JOB
;
3200 /* We don't want to be notified about jobs stopping if job control
3201 is not active. XXX - was interactive_shell instead of job_control */
3202 waitpid_flags
= (job_control
&& subshell_environment
== 0)
3203 ? (WUNTRACED
|wcontinued
)
3205 if (sigchld
|| block
== 0)
3206 waitpid_flags
|= WNOHANG
;
3208 /* Check for terminating signals and exit the shell if we receive one */
3210 /* Check for a trapped signal interrupting the wait builtin and jump out */
3213 if (block
== 1 && queue_sigchld
== 0 && (waitpid_flags
& WNOHANG
) == 0)
3215 internal_warning (_("waitchld: turning on WNOHANG to avoid indefinite block"));
3216 waitpid_flags
|= WNOHANG
;
3219 pid
= WAITPID (-1, &status
, waitpid_flags
);
3221 /* WCONTINUED may be rejected by waitpid as invalid even when defined */
3222 if (wcontinued
&& pid
< 0 && errno
== EINVAL
)
3225 continue; /* jump back to the test and retry without WCONTINUED */
3228 /* The check for WNOHANG is to make sure we decrement sigchld only
3229 if it was non-zero before we called waitpid. */
3230 if (sigchld
> 0 && (waitpid_flags
& WNOHANG
))
3233 /* If waitpid returns -1 with errno == ECHILD, there are no more
3234 unwaited-for child processes of this shell. */
3235 if (pid
< 0 && errno
== ECHILD
)
3237 if (children_exited
== 0)
3243 /* If waitpid returns 0, there are running children. If it returns -1,
3244 the only other error POSIX says it can return is EINTR. */
3248 /* If waitpid returns -1/EINTR and the shell saw a SIGINT, then we
3249 assume the child has blocked or handled SIGINT. In that case, we
3250 require the child to actually die due to SIGINT to act on the
3251 SIGINT we received; otherwise we assume the child handled it and
3253 if (pid
< 0 && errno
== EINTR
&& wait_sigint_received
)
3254 child_caught_sigint
= 1;
3257 continue; /* jumps right to the test */
3259 /* If the child process did die due to SIGINT, forget our assumption
3260 that it caught or otherwise handled it. */
3261 if (WIFSIGNALED (status
) && WTERMSIG (status
) == SIGINT
)
3262 child_caught_sigint
= 0;
3264 /* children_exited is used to run traps on SIGCHLD. We don't want to
3265 run the trap if a process is just being continued. */
3266 if (WIFCONTINUED(status
) == 0)
3272 /* Locate our PROCESS for this pid. */
3273 child
= find_process (pid
, 1, &job
); /* want living procs only */
3275 #if defined (COPROCESS_SUPPORT)
3276 coproc_pidchk (pid
, WSTATUS(status
));
3279 /* It is not an error to have a child terminate that we did
3280 not have a record of. This child could have been part of
3281 a pipeline in backquote substitution. Even so, I'm not
3282 sure child is ever non-zero. */
3285 if (WIFEXITED (status
) || WIFSIGNALED (status
))
3290 /* Remember status, and whether or not the process is running. */
3291 child
->status
= status
;
3292 child
->running
= WIFCONTINUED(status
) ? PS_RUNNING
: PS_DONE
;
3294 if (PEXITED (child
))
3304 call_set_current
+= set_job_status_and_cleanup (job
);
3307 last_stopped_job
= job
;
3308 else if (DEADJOB (job
) && last_stopped_job
== job
)
3309 last_stopped_job
= NO_JOB
;
3311 while ((sigchld
|| block
== 0) && pid
> (pid_t
)0);
3313 /* If a job was running and became stopped, then set the current
3314 job. Otherwise, don't change a thing. */
3315 if (call_set_current
)
3317 if (last_stopped_job
!= NO_JOB
)
3318 set_current_job (last_stopped_job
);
3323 /* Call a SIGCHLD trap handler for each child that exits, if one is set. */
3324 if (job_control
&& signal_is_trapped (SIGCHLD
) && children_exited
&&
3325 trap_list
[SIGCHLD
] != (char *)IGNORE_SIG
)
3327 if (posixly_correct
&& this_shell_builtin
&& this_shell_builtin
== wait_builtin
)
3329 interrupt_immediately
= 0;
3330 trap_handler (SIGCHLD
); /* set pending_traps[SIGCHLD] */
3331 wait_signal_received
= SIGCHLD
;
3332 /* If we're in a signal handler, let CHECK_WAIT_INTR pick it up;
3333 run_pending_traps will call run_sigchld_trap later */
3335 longjmp (wait_intr_buf
, 1);
3337 /* If not in posix mode and not executing the wait builtin, queue the
3338 signal for later handling. Run the trap immediately if we are
3339 executing the wait builtin, but don't break out of `wait'. */
3340 else if (sigchld
) /* called from signal handler */
3341 queue_sigchld_trap (children_exited
);
3342 else if (running_trap
)
3343 queue_sigchld_trap (children_exited
);
3344 else if (this_shell_builtin
== wait_builtin
)
3345 run_sigchld_trap (children_exited
);
3347 queue_sigchld_trap (children_exited
);
3350 /* We have successfully recorded the useful information about this process
3351 that has just changed state. If we notify asynchronously, and the job
3352 that this process belongs to is no longer running, then notify the user
3353 of that fact now. */
3354 if (asynchronous_notification
&& interactive
)
3355 notify_of_job_status ();
3357 return (children_exited
);
3360 /* Set the status of JOB and perform any necessary cleanup if the job is
3363 Currently, the cleanup activity is restricted to handling any SIGINT
3364 received while waiting for a foreground job to finish. */
3366 set_job_status_and_cleanup (job
)
3370 int tstatus
, job_state
, any_stopped
, any_tstped
, call_set_current
;
3371 SigHandler
*temp_handler
;
3373 child
= jobs
[job
]->pipe
;
3374 jobs
[job
]->flags
&= ~J_NOTIFIED
;
3376 call_set_current
= 0;
3379 * COMPUTE JOB STATUS
3382 /* If all children are not running, but any of them is stopped, then
3383 the job is stopped, not dead. */
3384 job_state
= any_stopped
= any_tstped
= 0;
3387 job_state
|= PRUNNING (child
);
3389 if (PEXITED (child
) && (WIFSTOPPED (child
->status
)))
3391 /* Only checking for WIFSTOPPED now, not for PS_DONE */
3392 if (PSTOPPED (child
))
3396 any_tstped
|= job_control
&& (WSTOPSIG (child
->status
) == SIGTSTP
);
3398 child
= child
->next
;
3400 while (child
!= jobs
[job
]->pipe
);
3402 /* If job_state != 0, the job is still running, so don't bother with
3403 setting the process exit status and job state unless we're
3404 transitioning from stopped to running. */
3405 if (job_state
!= 0 && JOBSTATE(job
) != JSTOPPED
)
3412 /* The job is either stopped or dead. Set the state of the job accordingly. */
3415 jobs
[job
]->state
= JSTOPPED
;
3416 jobs
[job
]->flags
&= ~J_FOREGROUND
;
3418 /* Suspending a job with SIGTSTP breaks all active loops. */
3419 if (any_tstped
&& loop_level
)
3420 breaking
= loop_level
;
3422 else if (job_state
!= 0) /* was stopped, now running */
3424 jobs
[job
]->state
= JRUNNING
;
3429 jobs
[job
]->state
= JDEAD
;
3433 if (IS_FOREGROUND (job
))
3437 /* If this job has a cleanup function associated with it, call it
3438 with `cleanarg' as the single argument, then set the function
3439 pointer to NULL so it is not inadvertently called twice. The
3440 cleanup function is responsible for deallocating cleanarg. */
3441 if (jobs
[job
]->j_cleanup
)
3443 (*jobs
[job
]->j_cleanup
) (jobs
[job
]->cleanarg
);
3444 jobs
[job
]->j_cleanup
= (sh_vptrfunc_t
*)NULL
;
3451 * Currently, we just do special things if we got a SIGINT while waiting
3452 * for a foreground job to complete
3455 if (JOBSTATE (job
) == JDEAD
)
3457 /* If we're running a shell script and we get a SIGINT with a
3458 SIGINT trap handler, but the foreground job handles it and
3459 does not exit due to SIGINT, run the trap handler but do not
3460 otherwise act as if we got the interrupt. */
3461 if (wait_sigint_received
&& interactive_shell
== 0 &&
3462 child_caught_sigint
&& IS_FOREGROUND (job
) &&
3463 signal_is_trapped (SIGINT
))
3466 wait_sigint_received
= 0;
3467 last_command_exit_value
= process_exit_status (child
->status
);
3469 old_frozen
= jobs_list_frozen
;
3470 jobs_list_frozen
= 1;
3471 tstatus
= maybe_call_trap_handler (SIGINT
);
3472 jobs_list_frozen
= old_frozen
;
3475 /* If the foreground job is killed by SIGINT when job control is not
3476 active, we need to perform some special handling.
3478 The check of wait_sigint_received is a way to determine if the
3479 SIGINT came from the keyboard (in which case the shell has already
3480 seen it, and wait_sigint_received is non-zero, because keyboard
3481 signals are sent to process groups) or via kill(2) to the foreground
3482 process by another process (or itself). If the shell did receive the
3483 SIGINT, it needs to perform normal SIGINT processing. */
3484 else if (wait_sigint_received
&&
3485 child_caught_sigint
== 0 &&
3486 IS_FOREGROUND (job
) && IS_JOBCONTROL (job
) == 0)
3490 wait_sigint_received
= 0;
3492 /* If SIGINT is trapped, set the exit status so that the trap
3493 handler can see it. */
3494 if (signal_is_trapped (SIGINT
))
3495 last_command_exit_value
= process_exit_status (child
->status
);
3497 /* If the signal is trapped, let the trap handler get it no matter
3498 what and simply return if the trap handler returns.
3499 maybe_call_trap_handler() may cause dead jobs to be removed from
3500 the job table because of a call to execute_command. We work
3501 around this by setting JOBS_LIST_FROZEN. */
3502 old_frozen
= jobs_list_frozen
;
3503 jobs_list_frozen
= 1;
3504 tstatus
= maybe_call_trap_handler (SIGINT
);
3505 jobs_list_frozen
= old_frozen
;
3506 if (tstatus
== 0 && old_sigint_handler
!= INVALID_SIGNAL_HANDLER
)
3508 /* wait_sigint_handler () has already seen SIGINT and
3509 allowed the wait builtin to jump out. We need to
3510 call the original SIGINT handler, if necessary. If
3511 the original handler is SIG_DFL, we need to resend
3512 the signal to ourselves. */
3514 temp_handler
= old_sigint_handler
;
3516 /* Bogus. If we've reset the signal handler as the result
3517 of a trap caught on SIGINT, then old_sigint_handler
3518 will point to trap_handler, which now knows nothing about
3519 SIGINT (if we reset the sighandler to the default).
3520 In this case, we have to fix things up. What a crock. */
3521 if (temp_handler
== trap_handler
&& signal_is_trapped (SIGINT
) == 0)
3522 temp_handler
= trap_to_sighandler (SIGINT
);
3523 restore_sigint_handler ();
3524 if (temp_handler
== SIG_DFL
)
3525 termsig_handler (SIGINT
); /* XXX */
3526 else if (temp_handler
!= SIG_IGN
)
3527 (*temp_handler
) (SIGINT
);
3532 return call_set_current
;
3535 /* Build the array of values for the $PIPESTATUS variable from the set of
3536 exit statuses of all processes in the job J. */
3541 #if defined (ARRAY_VARS)
3543 register PROCESS
*p
;
3545 for (i
= 1, p
= jobs
[j
]->pipe
; p
->next
!= jobs
[j
]->pipe
; p
= p
->next
, i
++)
3550 pstatuses
= (int *)xrealloc (pstatuses
, i
* sizeof (int));
3557 pstatuses
[i
++] = process_exit_status (p
->status
);
3560 while (p
!= jobs
[j
]->pipe
);
3562 pstatuses
[i
] = -1; /* sentinel */
3563 set_pipestatus_array (pstatuses
, i
);
3568 run_sigchld_trap (nchild
)
3574 /* Turn off the trap list during the call to parse_and_execute ()
3575 to avoid potentially infinite recursive calls. Preserve the
3576 values of last_command_exit_value, last_made_pid, and the_pipeline
3577 around the execution of the trap commands. */
3578 trap_command
= savestring (trap_list
[SIGCHLD
]);
3580 begin_unwind_frame ("SIGCHLD trap");
3581 unwind_protect_int (last_command_exit_value
);
3582 unwind_protect_int (last_command_exit_signal
);
3583 unwind_protect_var (last_made_pid
);
3584 unwind_protect_int (interrupt_immediately
);
3585 unwind_protect_int (jobs_list_frozen
);
3586 unwind_protect_pointer (the_pipeline
);
3587 unwind_protect_pointer (subst_assign_varlist
);
3589 /* We have to add the commands this way because they will be run
3590 in reverse order of adding. We don't want maybe_set_sigchld_trap ()
3591 to reference freed memory. */
3592 add_unwind_protect (xfree
, trap_command
);
3593 add_unwind_protect (maybe_set_sigchld_trap
, trap_command
);
3595 subst_assign_varlist
= (WORD_LIST
*)NULL
;
3596 the_pipeline
= (PROCESS
*)NULL
;
3598 running_trap
= SIGCHLD
+ 1;
3600 set_impossible_sigchld_trap ();
3601 jobs_list_frozen
= 1;
3602 for (i
= 0; i
< nchild
; i
++)
3605 interrupt_immediately
= 1;
3607 parse_and_execute (savestring (trap_command
), "trap", SEVAL_NOHIST
|SEVAL_RESETLINE
);
3610 run_unwind_frame ("SIGCHLD trap");
3614 /* Function to call when you want to notify people of changes
3615 in job status. This prints out all jobs which are pending
3616 notification to stderr, and marks those printed as already
3617 notified, thus making them candidates for cleanup. */
3619 notify_of_job_status ()
3621 register int job
, termsig
;
3626 if (jobs
== 0 || js
.j_jobslots
== 0)
3632 sigaddset (&set
, SIGCHLD
);
3633 sigaddset (&set
, SIGTTOU
);
3634 sigemptyset (&oset
);
3635 sigprocmask (SIG_BLOCK
, &set
, &oset
);
3640 /* XXX could use js.j_firstj here */
3641 for (job
= 0, dir
= (char *)NULL
; job
< js
.j_jobslots
; job
++)
3643 if (jobs
[job
] && IS_NOTIFIED (job
) == 0)
3645 s
= raw_job_exit_status (job
);
3646 termsig
= WTERMSIG (s
);
3648 /* POSIX.2 says we have to hang onto the statuses of at most the
3649 last CHILD_MAX background processes if the shell is running a
3650 script. If the shell is running a script, either from a file
3651 or standard input, don't print anything unless the job was
3652 killed by a signal. */
3653 if (startup_state
== 0 && WIFSIGNALED (s
) == 0 &&
3654 ((DEADJOB (job
) && IS_FOREGROUND (job
) == 0) || STOPPED (job
)))
3658 /* If job control is disabled, don't print the status messages.
3659 Mark dead jobs as notified so that they get cleaned up. If
3660 startup_state == 2, we were started to run `-c command', so
3661 don't print anything. */
3662 if ((job_control
== 0 && interactive_shell
) || startup_state
== 2)
3664 /* If job control is disabled, don't print the status messages.
3665 Mark dead jobs as notified so that they get cleaned up. If
3666 startup_state == 2 and subshell_environment has the
3667 SUBSHELL_COMSUB bit turned on, we were started to run a command
3668 substitution, so don't print anything. */
3669 if ((job_control
== 0 && interactive_shell
) ||
3670 (startup_state
== 2 && (subshell_environment
& SUBSHELL_COMSUB
)))
3673 /* POSIX.2 compatibility: if the shell is not interactive,
3674 hang onto the job corresponding to the last asynchronous
3675 pid until the user has been notified of its status or does
3677 if (DEADJOB (job
) && (interactive_shell
|| (find_last_pid (job
, 0) != last_asynchronous_pid
)))
3678 jobs
[job
]->flags
|= J_NOTIFIED
;
3682 /* Print info on jobs that are running in the background,
3683 and on foreground jobs that were killed by anything
3684 except SIGINT (and possibly SIGPIPE). */
3685 switch (JOBSTATE (job
))
3688 if (interactive_shell
== 0 && termsig
&& WIFSIGNALED (s
) &&
3689 termsig
!= SIGINT
&&
3690 #if defined (DONT_REPORT_SIGTERM)
3691 termsig
!= SIGTERM
&&
3693 #if defined (DONT_REPORT_SIGPIPE)
3694 termsig
!= SIGPIPE
&&
3696 signal_is_trapped (termsig
) == 0)
3698 /* Don't print `0' for a line number. */
3699 fprintf (stderr
, _("%s: line %d: "), get_name_for_error (), (line_number
== 0) ? 1 : line_number
);
3700 pretty_print_job (job
, JLIST_NONINTERACTIVE
, stderr
);
3702 else if (IS_FOREGROUND (job
))
3704 #if !defined (DONT_REPORT_SIGPIPE)
3705 if (termsig
&& WIFSIGNALED (s
) && termsig
!= SIGINT
)
3707 if (termsig
&& WIFSIGNALED (s
) && termsig
!= SIGINT
&& termsig
!= SIGPIPE
)
3710 fprintf (stderr
, "%s", j_strsignal (termsig
));
3713 fprintf (stderr
, _(" (core dumped)"));
3715 fprintf (stderr
, "\n");
3718 else if (job_control
) /* XXX job control test added */
3721 dir
= current_working_directory ();
3722 pretty_print_job (job
, JLIST_STANDARD
, stderr
);
3723 if (dir
&& strcmp (dir
, jobs
[job
]->wd
) != 0)
3725 _("(wd now: %s)\n"), polite_directory_format (dir
));
3728 jobs
[job
]->flags
|= J_NOTIFIED
;
3732 fprintf (stderr
, "\n");
3734 dir
= current_working_directory ();
3735 pretty_print_job (job
, JLIST_STANDARD
, stderr
);
3736 if (dir
&& (strcmp (dir
, jobs
[job
]->wd
) != 0))
3738 _("(wd now: %s)\n"), polite_directory_format (dir
));
3739 jobs
[job
]->flags
|= J_NOTIFIED
;
3747 programming_error ("notify_of_job_status");
3752 sigprocmask (SIG_SETMASK
, &oset
, (sigset_t
*)NULL
);
3757 /* Initialize the job control mechanism, and set up the tty stuff. */
3759 initialize_job_control (force
)
3766 shell_pgrp
= getpgid (0);
3768 if (shell_pgrp
== -1)
3770 sys_error (_("initialize_job_control: getpgrp failed"));
3774 /* We can only have job control if we are interactive unless we force it. */
3775 if (interactive
== 0 && force
== 0)
3778 original_pgrp
= NO_PID
;
3779 shell_tty
= fileno (stderr
);
3785 /* If forced_interactive is set, we skip the normal check that stderr
3786 is attached to a tty, so we need to check here. If it's not, we
3787 need to see whether we have a controlling tty by opening /dev/tty,
3788 since trying to use job control tty pgrp manipulations on a non-tty
3789 is going to fail. */
3790 if (forced_interactive
&& isatty (fileno (stderr
)) == 0)
3791 shell_tty
= open ("/dev/tty", O_RDWR
|O_NONBLOCK
);
3793 /* Get our controlling terminal. If job_control is set, or
3794 interactive is set, then this is an interactive shell no
3795 matter where fd 2 is directed. */
3796 if (shell_tty
== -1)
3797 shell_tty
= dup (fileno (stderr
)); /* fd 2 */
3799 if (shell_tty
!= -1)
3800 shell_tty
= move_to_high_fd (shell_tty
, 1, -1);
3802 /* Compensate for a bug in systems that compiled the BSD
3803 rlogind with DEBUG defined, like NeXT and Alliant. */
3804 if (shell_pgrp
== 0)
3806 shell_pgrp
= getpid ();
3807 setpgid (0, shell_pgrp
);
3808 tcsetpgrp (shell_tty
, shell_pgrp
);
3811 while ((terminal_pgrp
= tcgetpgrp (shell_tty
)) != -1)
3813 if (shell_pgrp
!= terminal_pgrp
)
3817 ottin
= set_signal_handler(SIGTTIN
, SIG_DFL
);
3819 set_signal_handler (SIGTTIN
, ottin
);
3825 if (terminal_pgrp
== -1)
3828 /* Make sure that we are using the new line discipline. */
3829 if (set_new_line_discipline (shell_tty
) < 0)
3831 sys_error (_("initialize_job_control: line discipline"));
3836 original_pgrp
= shell_pgrp
;
3837 shell_pgrp
= getpid ();
3839 if ((original_pgrp
!= shell_pgrp
) && (setpgid (0, shell_pgrp
) < 0))
3841 sys_error (_("initialize_job_control: setpgid"));
3842 shell_pgrp
= original_pgrp
;
3847 /* If (and only if) we just set our process group to our pid,
3848 thereby becoming a process group leader, and the terminal
3849 is not in the same process group as our (new) process group,
3850 then set the terminal's process group to our (new) process
3851 group. If that fails, set our process group back to what it
3852 was originally (so we can still read from the terminal) and
3853 turn off job control. */
3854 if (shell_pgrp
!= original_pgrp
&& shell_pgrp
!= terminal_pgrp
)
3856 if (give_terminal_to (shell_pgrp
, 0) < 0)
3859 setpgid (0, original_pgrp
);
3860 shell_pgrp
= original_pgrp
;
3862 sys_error (_("cannot set terminal process group (%d)"), shell_pgrp
);
3867 if (job_control
&& ((t
= tcgetpgrp (shell_tty
)) == -1 || t
!= shell_pgrp
))
3871 sys_error (_("cannot set terminal process group (%d)"), t
);
3875 if (job_control
== 0)
3876 internal_error (_("no job control in this shell"));
3879 if (shell_tty
!= fileno (stderr
))
3880 SET_CLOSE_ON_EXEC (shell_tty
);
3882 set_signal_handler (SIGCHLD
, sigchld_handler
);
3884 change_flag ('m', job_control
? '-' : '+');
3889 if (js
.c_childmax
< 0)
3890 js
.c_childmax
= getmaxchild ();
3891 if (js
.c_childmax
< 0)
3892 js
.c_childmax
= DEFAULT_CHILD_MAX
;
3899 debug_print_pgrps ()
3901 itrace("original_pgrp = %ld shell_pgrp = %ld terminal_pgrp = %ld",
3902 (long)original_pgrp
, (long)shell_pgrp
, (long)terminal_pgrp
);
3903 itrace("tcgetpgrp(%d) -> %ld, getpgid(0) -> %ld",
3904 shell_tty
, (long)tcgetpgrp (shell_tty
), (long)getpgid(0));
3908 /* Set the line discipline to the best this system has to offer.
3909 Return -1 if this is not possible. */
3911 set_new_line_discipline (tty
)
3914 #if defined (NEW_TTY_DRIVER)
3917 if (ioctl (tty
, TIOCGETD
, &ldisc
) < 0)
3920 if (ldisc
!= NTTYDISC
)
3924 if (ioctl (tty
, TIOCSETD
, &ldisc
) < 0)
3928 #endif /* NEW_TTY_DRIVER */
3930 #if defined (TERMIO_TTY_DRIVER)
3931 # if defined (TERMIO_LDISC) && (NTTYDISC)
3932 if (ioctl (tty
, TCGETA
, &shell_tty_info
) < 0)
3935 if (shell_tty_info
.c_line
!= NTTYDISC
)
3937 shell_tty_info
.c_line
= NTTYDISC
;
3938 if (ioctl (tty
, TCSETAW
, &shell_tty_info
) < 0)
3941 # endif /* TERMIO_LDISC && NTTYDISC */
3943 #endif /* TERMIO_TTY_DRIVER */
3945 #if defined (TERMIOS_TTY_DRIVER)
3946 # if defined (TERMIOS_LDISC) && defined (NTTYDISC)
3947 if (tcgetattr (tty
, &shell_tty_info
) < 0)
3950 if (shell_tty_info
.c_line
!= NTTYDISC
)
3952 shell_tty_info
.c_line
= NTTYDISC
;
3953 if (tcsetattr (tty
, TCSADRAIN
, &shell_tty_info
) < 0)
3956 # endif /* TERMIOS_LDISC && NTTYDISC */
3958 #endif /* TERMIOS_TTY_DRIVER */
3960 #if !defined (NEW_TTY_DRIVER) && !defined (TERMIO_TTY_DRIVER) && !defined (TERMIOS_TTY_DRIVER)
3965 /* Setup this shell to handle C-C, etc. */
3967 initialize_job_signals ()
3971 set_signal_handler (SIGINT
, sigint_sighandler
);
3972 set_signal_handler (SIGTSTP
, SIG_IGN
);
3973 set_signal_handler (SIGTTOU
, SIG_IGN
);
3974 set_signal_handler (SIGTTIN
, SIG_IGN
);
3976 else if (job_control
)
3978 old_tstp
= set_signal_handler (SIGTSTP
, sigstop_sighandler
);
3979 old_ttin
= set_signal_handler (SIGTTIN
, sigstop_sighandler
);
3980 old_ttou
= set_signal_handler (SIGTTOU
, sigstop_sighandler
);
3982 /* Leave these things alone for non-interactive shells without job
3986 /* Here we handle CONT signals. */
3988 sigcont_sighandler (sig
)
3991 initialize_job_signals ();
3992 set_signal_handler (SIGCONT
, old_cont
);
3993 kill (getpid (), SIGCONT
);
3998 /* Here we handle stop signals while we are running not as a login shell. */
4000 sigstop_sighandler (sig
)
4003 set_signal_handler (SIGTSTP
, old_tstp
);
4004 set_signal_handler (SIGTTOU
, old_ttou
);
4005 set_signal_handler (SIGTTIN
, old_ttin
);
4007 old_cont
= set_signal_handler (SIGCONT
, sigcont_sighandler
);
4009 give_terminal_to (shell_pgrp
, 0);
4011 kill (getpid (), sig
);
4016 /* Give the terminal to PGRP. */
4018 give_terminal_to (pgrp
, force
)
4026 if (job_control
|| force
)
4029 sigaddset (&set
, SIGTTOU
);
4030 sigaddset (&set
, SIGTTIN
);
4031 sigaddset (&set
, SIGTSTP
);
4032 sigaddset (&set
, SIGCHLD
);
4033 sigemptyset (&oset
);
4034 sigprocmask (SIG_BLOCK
, &set
, &oset
);
4036 if (tcsetpgrp (shell_tty
, pgrp
) < 0)
4038 /* Maybe we should print an error message? */
4040 sys_error ("tcsetpgrp(%d) failed: pid %ld to pgrp %ld",
4041 shell_tty
, (long)getpid(), (long)pgrp
);
4047 terminal_pgrp
= pgrp
;
4048 sigprocmask (SIG_SETMASK
, &oset
, (sigset_t
*)NULL
);
4057 /* Give terminal to NPGRP iff it's currently owned by OPGRP. FLAGS are the
4058 flags to pass to give_terminal_to(). */
4060 maybe_give_terminal_to (opgrp
, npgrp
, flags
)
4066 tpgrp
= tcgetpgrp (shell_tty
);
4067 if (tpgrp
< 0 && errno
== ENOTTY
)
4071 terminal_pgrp
= npgrp
;
4074 else if (tpgrp
!= opgrp
)
4077 internal_warning ("maybe_give_terminal_to: terminal pgrp == %d shell pgrp = %d new pgrp = %d", tpgrp
, opgrp
, npgrp
);
4082 return (give_terminal_to (npgrp
, flags
));
4085 /* Clear out any jobs in the job array. This is intended to be used by
4086 children of the shell, who should not have any job structures as baggage
4087 when they start executing (forking subshells for parenthesized execution
4088 and functions with pipes are the two that spring to mind). If RUNNING_ONLY
4089 is nonzero, only running jobs are removed from the table. */
4091 delete_all_jobs (running_only
)
4097 BLOCK_CHILD (set
, oset
);
4099 /* XXX - need to set j_lastj, j_firstj appropriately if running_only != 0. */
4102 js
.j_current
= js
.j_previous
= NO_JOB
;
4104 /* XXX could use js.j_firstj here */
4105 for (i
= 0; i
< js
.j_jobslots
; i
++)
4108 if (i
< js
.j_firstj
&& jobs
[i
])
4109 itrace("delete_all_jobs: job %d non-null before js.j_firstj (%d)", i
, js
.j_firstj
);
4110 if (i
> js
.j_lastj
&& jobs
[i
])
4111 itrace("delete_all_jobs: job %d non-null after js.j_lastj (%d)", i
, js
.j_lastj
);
4113 if (jobs
[i
] && (running_only
== 0 || (running_only
&& RUNNING(i
))))
4114 delete_job (i
, DEL_WARNSTOPPED
);
4116 if (running_only
== 0)
4118 free ((char *)jobs
);
4120 js
.j_firstj
= js
.j_lastj
= js
.j_njobs
= 0;
4124 if (running_only
== 0)
4127 UNBLOCK_CHILD (oset
);
4130 /* Mark all jobs in the job array so that they don't get a SIGHUP when the
4131 shell gets one. If RUNNING_ONLY is nonzero, mark only running jobs. */
4133 nohup_all_jobs (running_only
)
4139 BLOCK_CHILD (set
, oset
);
4143 /* XXX could use js.j_firstj here */
4144 for (i
= 0; i
< js
.j_jobslots
; i
++)
4145 if (jobs
[i
] && (running_only
== 0 || (running_only
&& RUNNING(i
))))
4149 UNBLOCK_CHILD (oset
);
4158 /* This really counts all non-dead jobs. */
4159 BLOCK_CHILD (set
, oset
);
4160 /* XXX could use js.j_firstj here */
4161 for (i
= n
= 0; i
< js
.j_jobslots
; i
++)
4164 if (i
< js
.j_firstj
&& jobs
[i
])
4165 itrace("count_all_jobs: job %d non-null before js.j_firstj (%d)", i
, js
.j_firstj
);
4166 if (i
> js
.j_lastj
&& jobs
[i
])
4167 itrace("count_all_jobs: job %d non-null after js.j_lastj (%d)", i
, js
.j_lastj
);
4169 if (jobs
[i
] && DEADJOB(i
) == 0)
4172 UNBLOCK_CHILD (oset
);
4177 mark_all_jobs_as_dead ()
4182 if (js
.j_jobslots
== 0)
4185 BLOCK_CHILD (set
, oset
);
4187 /* XXX could use js.j_firstj here */
4188 for (i
= 0; i
< js
.j_jobslots
; i
++)
4191 jobs
[i
]->state
= JDEAD
;
4195 UNBLOCK_CHILD (oset
);
4198 /* Mark all dead jobs as notified, so delete_job () cleans them out
4199 of the job table properly. POSIX.2 says we need to save the
4200 status of the last CHILD_MAX jobs, so we count the number of dead
4201 jobs and mark only enough as notified to save CHILD_MAX statuses. */
4203 mark_dead_jobs_as_notified (force
)
4206 register int i
, ndead
, ndeadproc
;
4209 if (js
.j_jobslots
== 0)
4212 BLOCK_CHILD (set
, oset
);
4214 /* If FORCE is non-zero, we don't have to keep CHILD_MAX statuses
4215 around; just run through the array. */
4218 /* XXX could use js.j_firstj here */
4219 for (i
= 0; i
< js
.j_jobslots
; i
++)
4221 if (jobs
[i
] && DEADJOB (i
) && (interactive_shell
|| (find_last_pid (i
, 0) != last_asynchronous_pid
)))
4222 jobs
[i
]->flags
|= J_NOTIFIED
;
4224 UNBLOCK_CHILD (oset
);
4228 /* Mark enough dead jobs as notified to keep CHILD_MAX processes left in the
4229 array with the corresponding not marked as notified. This is a better
4230 way to avoid pid aliasing and reuse problems than keeping the POSIX-
4231 mandated CHILD_MAX jobs around. delete_job() takes care of keeping the
4232 bgpids list regulated. */
4234 /* Count the number of dead jobs */
4235 /* XXX could use js.j_firstj here */
4236 for (i
= ndead
= ndeadproc
= 0; i
< js
.j_jobslots
; i
++)
4239 if (i
< js
.j_firstj
&& jobs
[i
])
4240 itrace("mark_dead_jobs_as_notified: job %d non-null before js.j_firstj (%d)", i
, js
.j_firstj
);
4241 if (i
> js
.j_lastj
&& jobs
[i
])
4242 itrace("mark_dead_jobs_as_notified: job %d non-null after js.j_lastj (%d)", i
, js
.j_lastj
);
4244 if (jobs
[i
] && DEADJOB (i
))
4247 ndeadproc
+= processes_in_job (i
);
4253 if (ndeadproc
!= js
.c_reaped
)
4254 itrace("mark_dead_jobs_as_notified: ndeadproc (%d) != js.c_reaped (%d)", ndeadproc
, js
.c_reaped
);
4256 if (ndead
!= js
.j_ndead
)
4257 itrace("mark_dead_jobs_as_notified: ndead (%d) != js.j_ndead (%d)", ndead
, js
.j_ndead
);
4260 if (js
.c_childmax
< 0)
4261 js
.c_childmax
= getmaxchild ();
4262 if (js
.c_childmax
< 0)
4263 js
.c_childmax
= DEFAULT_CHILD_MAX
;
4265 /* Don't do anything if the number of dead processes is less than CHILD_MAX
4266 and we're not forcing a cleanup. */
4267 if (ndeadproc
<= js
.c_childmax
)
4269 UNBLOCK_CHILD (oset
);
4274 itrace("mark_dead_jobs_as_notified: child_max = %d ndead = %d ndeadproc = %d", js
.c_childmax
, ndead
, ndeadproc
);
4277 /* Mark enough dead jobs as notified that we keep CHILD_MAX jobs in
4278 the list. This isn't exactly right yet; changes need to be made
4279 to stop_pipeline so we don't mark the newer jobs after we've
4280 created CHILD_MAX slots in the jobs array. This needs to be
4281 integrated with a way to keep the jobs array from growing without
4282 bound. Maybe we wrap back around to 0 after we reach some max
4283 limit, and there are sufficient job slots free (keep track of total
4284 size of jobs array (js.j_jobslots) and running count of number of jobs
4285 in jobs array. Then keep a job index corresponding to the `oldest job'
4286 and start this loop there, wrapping around as necessary. In effect,
4287 we turn the list into a circular buffer. */
4288 /* XXX could use js.j_firstj here */
4289 for (i
= 0; i
< js
.j_jobslots
; i
++)
4291 if (jobs
[i
] && DEADJOB (i
) && (interactive_shell
|| (find_last_pid (i
, 0) != last_asynchronous_pid
)))
4294 if (i
< js
.j_firstj
&& jobs
[i
])
4295 itrace("mark_dead_jobs_as_notified: job %d non-null before js.j_firstj (%d)", i
, js
.j_firstj
);
4296 if (i
> js
.j_lastj
&& jobs
[i
])
4297 itrace("mark_dead_jobs_as_notified: job %d non-null after js.j_lastj (%d)", i
, js
.j_lastj
);
4299 /* If marking this job as notified would drop us down below
4300 child_max, don't mark it so we can keep at least child_max
4301 statuses. XXX -- need to check what Posix actually says
4302 about keeping statuses. */
4303 if ((ndeadproc
-= processes_in_job (i
)) <= js
.c_childmax
)
4305 jobs
[i
]->flags
|= J_NOTIFIED
;
4309 UNBLOCK_CHILD (oset
);
4312 /* Here to allow other parts of the shell (like the trap stuff) to
4313 freeze and unfreeze the jobs list. */
4317 jobs_list_frozen
= 1;
4321 unfreeze_jobs_list ()
4323 jobs_list_frozen
= 0;
4326 /* Allow or disallow job control to take place. Returns the old value
4329 set_job_control (arg
)
4337 /* If we're turning on job control, reset pipeline_pgrp so make_child will
4338 put new child processes into the right pgrp */
4339 if (job_control
!= old
&& job_control
)
4345 /* Turn off all traces of job control. This is run by children of the shell
4346 which are going to do shellsy things, like wait (), etc. */
4348 without_job_control ()
4350 stop_making_children ();
4352 #if defined (PGRP_PIPE)
4353 sh_closepipe (pgrp_pipe
);
4355 delete_all_jobs (0);
4356 set_job_control (0);
4359 /* If this shell is interactive, terminate all stopped jobs and
4360 restore the original terminal process group. This is done
4361 before the `exec' builtin calls shell_execve. */
4365 if (interactive_shell
) /* XXX - should it be interactive? */
4367 terminate_stopped_jobs ();
4369 if (original_pgrp
>= 0)
4370 give_terminal_to (original_pgrp
, 1);
4373 if (original_pgrp
>= 0)
4374 setpgid (0, original_pgrp
);
4377 /* Restart job control by closing shell tty and reinitializing. This is
4378 called after an exec fails in an interactive shell and we do not exit. */
4380 restart_job_control ()
4382 if (shell_tty
!= -1)
4384 initialize_job_control (0);
4388 set_maxchild (nchild
)
4391 static int lmaxchild
= -1;
4394 lmaxchild
= getmaxchild ();
4396 lmaxchild
= DEFAULT_CHILD_MAX
;
4398 /* Clamp value we set. Minimum is what Posix requires, maximum is defined
4399 above as MAX_CHILD_MAX. */
4400 if (nchild
< lmaxchild
)
4402 else if (nchild
> MAX_CHILD_MAX
)
4403 nchild
= MAX_CHILD_MAX
;
4405 js
.c_childmax
= nchild
;
4408 /* Set the handler to run when the shell receives a SIGCHLD signal. */
4410 set_sigchld_handler ()
4412 set_signal_handler (SIGCHLD
, sigchld_handler
);
4415 #if defined (PGRP_PIPE)
4416 /* Read from the read end of a pipe. This is how the process group leader
4417 blocks until all of the processes in a pipeline have been made. */
4432 while (read (pp
[0], &ch
, 1) == -1 && errno
== EINTR
)
4437 /* Functional interface closes our local-to-job-control pipes. */
4441 sh_closepipe (pgrp_pipe
);
4445 save_pgrp_pipe (p
, clear
)
4449 p
[0] = pgrp_pipe
[0];
4450 p
[1] = pgrp_pipe
[1];
4452 pgrp_pipe
[0] = pgrp_pipe
[1] = -1;
4456 restore_pgrp_pipe (p
)
4459 pgrp_pipe
[0] = p
[0];
4460 pgrp_pipe
[1] = p
[1];
4463 #endif /* PGRP_PIPE */