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) 1989-2012 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 pid_t last_made_pid
= NO_PID
;
217 /* Pid of the last asynchronous child. */
218 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. Assumed 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
)
1721 sigaddset (&set
, SIGCHLD
);
1722 sigaddset (&set
, SIGINT
);
1723 sigemptyset (&oset
);
1724 sigprocmask (SIG_BLOCK
, &set
, &oset
);
1730 #if defined (BUFFERED_INPUT)
1731 /* If default_buffered_input is active, we are reading a script. If
1732 the command is asynchronous, we have already duplicated /dev/null
1733 as fd 0, but have not changed the buffered stream corresponding to
1734 the old fd 0. We don't want to sync the stream in this case. */
1735 if (default_buffered_input
!= -1 &&
1736 (!async_p
|| default_buffered_input
> 0))
1737 sync_buffered_stream (default_buffered_input
);
1738 #endif /* BUFFERED_INPUT */
1740 /* Create the child, handle severe errors. Retry on EAGAIN. */
1741 while ((pid
= fork ()) < 0 && errno
== EAGAIN
&& forksleep
< FORKSLEEP_MAX
)
1744 /* If we can't create any children, try to reap some dead ones. */
1747 sys_error ("fork: retry");
1748 if (sleep (forksleep
) != 0)
1757 /* Kill all of the processes in the current pipeline. */
1758 terminate_current_pipeline ();
1760 /* Discard the current pipeline, if any. */
1762 kill_current_pipeline ();
1764 last_command_exit_value
= EX_NOEXEC
;
1765 throw_to_top_level (); /* Reset signals, etc. */
1770 /* In the child. Give this child the right process group, set the
1771 signals to the default state for a new process. */
1775 #if defined (BUFFERED_INPUT)
1776 /* Close default_buffered_input if it's > 0. We don't close it if it's
1777 0 because that's the file descriptor used when redirecting input,
1778 and it's wrong to close the file in that case. */
1779 unset_bash_input (0);
1780 #endif /* BUFFERED_INPUT */
1782 /* Restore top-level signal mask. */
1783 sigprocmask (SIG_SETMASK
, &top_level_mask
, (sigset_t
*)NULL
);
1787 /* All processes in this pipeline belong in the same
1790 if (pipeline_pgrp
== 0) /* This is the first child. */
1791 pipeline_pgrp
= mypid
;
1793 /* Check for running command in backquotes. */
1794 if (pipeline_pgrp
== shell_pgrp
)
1795 ignore_tty_job_signals ();
1797 default_tty_job_signals ();
1799 /* Set the process group before trying to mess with the terminal's
1800 process group. This is mandated by POSIX. */
1801 /* This is in accordance with the Posix 1003.1 standard,
1802 section B.7.2.4, which says that trying to set the terminal
1803 process group with tcsetpgrp() to an unused pgrp value (like
1804 this would have for the first child) is an error. Section
1805 B.4.3.3, p. 237 also covers this, in the context of job control
1807 if (setpgid (mypid
, pipeline_pgrp
) < 0)
1808 sys_error (_("child setpgid (%ld to %ld)"), (long)mypid
, (long)pipeline_pgrp
);
1810 /* By convention (and assumption above), if
1811 pipeline_pgrp == shell_pgrp, we are making a child for
1812 command substitution.
1813 In this case, we don't want to give the terminal to the
1814 shell's process group (we could be in the middle of a
1815 pipeline, for example). */
1816 if (async_p
== 0 && pipeline_pgrp
!= shell_pgrp
&& ((subshell_environment
&SUBSHELL_ASYNC
) == 0))
1817 give_terminal_to (pipeline_pgrp
, 0);
1819 #if defined (PGRP_PIPE)
1820 if (pipeline_pgrp
== mypid
)
1821 pipe_read (pgrp_pipe
);
1824 else /* Without job control... */
1826 if (pipeline_pgrp
== 0)
1827 pipeline_pgrp
= shell_pgrp
;
1829 /* If these signals are set to SIG_DFL, we encounter the curious
1830 situation of an interactive ^Z to a running process *working*
1831 and stopping the process, but being unable to do anything with
1832 that process to change its state. On the other hand, if they
1833 are set to SIG_IGN, jobs started from scripts do not stop when
1834 the shell running the script gets a SIGTSTP and stops. */
1836 default_tty_job_signals ();
1839 #if defined (PGRP_PIPE)
1840 /* Release the process group pipe, since our call to setpgid ()
1841 is done. The last call to sh_closepipe is done in stop_pipeline. */
1842 sh_closepipe (pgrp_pipe
);
1843 #endif /* PGRP_PIPE */
1846 /* Don't set last_asynchronous_pid in the child */
1848 last_asynchronous_pid
= mypid
; /* XXX */
1851 #if defined (RECYCLES_PIDS)
1852 if (last_asynchronous_pid
== mypid
)
1853 /* Avoid pid aliasing. 1 seems like a safe, unusual pid value. */
1854 last_asynchronous_pid
= 1;
1859 /* In the parent. Remember the pid of the child just created
1860 as the proper pgrp if this is the first child. */
1864 if (pipeline_pgrp
== 0)
1866 pipeline_pgrp
= pid
;
1867 /* Don't twiddle terminal pgrps in the parent! This is the bug,
1868 not the good thing of twiddling them in the child! */
1869 /* give_terminal_to (pipeline_pgrp, 0); */
1871 /* This is done on the recommendation of the Rationale section of
1872 the POSIX 1003.1 standard, where it discusses job control and
1873 shells. It is done to avoid possible race conditions. (Ref.
1874 1003.1 Rationale, section B.4.3.3, page 236). */
1875 setpgid (pid
, pipeline_pgrp
);
1879 if (pipeline_pgrp
== 0)
1880 pipeline_pgrp
= shell_pgrp
;
1883 /* Place all processes into the jobs array regardless of the
1884 state of job_control. */
1885 add_process (command
, pid
);
1888 last_asynchronous_pid
= pid
;
1889 #if defined (RECYCLES_PIDS)
1890 else if (last_asynchronous_pid
== pid
)
1891 /* Avoid pid aliasing. 1 seems like a safe, unusual pid value. */
1892 last_asynchronous_pid
= 1;
1895 /* Delete the saved status for any job containing this PID in case it's
1897 delete_old_job (pid
);
1899 /* Perform the check for pid reuse unconditionally. Some systems reuse
1900 PIDs before giving a process CHILD_MAX/_SC_CHILD_MAX unique ones. */
1901 bgp_delete (pid
); /* new process, discard any saved status */
1903 last_made_pid
= pid
;
1909 /* Unblock SIGINT and SIGCHLD unless creating a pipeline, in which case
1910 SIGCHLD remains blocked until all commands in the pipeline have been
1912 sigprocmask (SIG_SETMASK
, &oset
, (sigset_t
*)NULL
);
1918 /* These two functions are called only in child processes. */
1920 ignore_tty_job_signals ()
1922 set_signal_handler (SIGTSTP
, SIG_IGN
);
1923 set_signal_handler (SIGTTIN
, SIG_IGN
);
1924 set_signal_handler (SIGTTOU
, SIG_IGN
);
1928 default_tty_job_signals ()
1930 set_signal_handler (SIGTSTP
, SIG_DFL
);
1931 set_signal_handler (SIGTTIN
, SIG_DFL
);
1932 set_signal_handler (SIGTTOU
, SIG_DFL
);
1935 /* When we end a job abnormally, or if we stop a job, we set the tty to the
1936 state kept in here. When a job ends normally, we set the state in here
1937 to the state of the tty. */
1939 static TTYSTRUCT shell_tty_info
;
1941 #if defined (NEW_TTY_DRIVER)
1942 static struct tchars shell_tchars
;
1943 static struct ltchars shell_ltchars
;
1944 #endif /* NEW_TTY_DRIVER */
1946 #if defined (NEW_TTY_DRIVER) && defined (DRAIN_OUTPUT)
1947 /* Since the BSD tty driver does not allow us to change the tty modes
1948 while simultaneously waiting for output to drain and preserving
1949 typeahead, we have to drain the output ourselves before calling
1950 ioctl. We cheat by finding the length of the output queue, and
1951 using select to wait for an appropriate length of time. This is
1952 a hack, and should be labeled as such (it's a hastily-adapted
1953 mutation of a `usleep' implementation). It's only reason for
1954 existing is the flaw in the BSD tty driver. */
1956 static int ttspeeds
[] =
1958 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200,
1959 1800, 2400, 4800, 9600, 19200, 38400
1966 register int delay
= ttspeeds
[ospeed
];
1972 while ((ioctl (fd
, TIOCOUTQ
, &n
) == 0) && n
)
1974 if (n
> (delay
/ 100))
1978 n
*= 10; /* 2 bits more for conservativeness. */
1979 tv
.tv_sec
= n
/ delay
;
1980 tv
.tv_usec
= ((n
% delay
) * 1000000) / delay
;
1981 select (fd
, (fd_set
*)0, (fd_set
*)0, (fd_set
*)0, &tv
);
1987 #endif /* NEW_TTY_DRIVER && DRAIN_OUTPUT */
1989 /* Return the fd from which we are actually getting input. */
1990 #define input_tty() (shell_tty != -1) ? shell_tty : fileno (stderr)
1992 /* Fill the contents of shell_tty_info with the current tty info. */
2001 #if defined (NEW_TTY_DRIVER)
2002 ioctl (tty
, TIOCGETP
, &shell_tty_info
);
2003 ioctl (tty
, TIOCGETC
, &shell_tchars
);
2004 ioctl (tty
, TIOCGLTC
, &shell_ltchars
);
2005 #endif /* NEW_TTY_DRIVER */
2007 #if defined (TERMIO_TTY_DRIVER)
2008 ioctl (tty
, TCGETA
, &shell_tty_info
);
2009 #endif /* TERMIO_TTY_DRIVER */
2011 #if defined (TERMIOS_TTY_DRIVER)
2012 if (tcgetattr (tty
, &shell_tty_info
) < 0)
2015 /* Only print an error message if we're really interactive at
2018 sys_error ("[%ld: %d (%d)] tcgetattr", (long)getpid (), shell_level
, tty
);
2022 #endif /* TERMIOS_TTY_DRIVER */
2023 if (check_window_size
)
2024 get_new_window_size (0, (int *)0, (int *)0);
2029 /* Make the current tty use the state in shell_tty_info. */
2038 #if defined (NEW_TTY_DRIVER)
2039 # if defined (DRAIN_OUTPUT)
2040 draino (tty
, shell_tty_info
.sg_ospeed
);
2041 # endif /* DRAIN_OUTPUT */
2042 ioctl (tty
, TIOCSETN
, &shell_tty_info
);
2043 ioctl (tty
, TIOCSETC
, &shell_tchars
);
2044 ioctl (tty
, TIOCSLTC
, &shell_ltchars
);
2045 #endif /* NEW_TTY_DRIVER */
2047 #if defined (TERMIO_TTY_DRIVER)
2048 ioctl (tty
, TCSETAW
, &shell_tty_info
);
2049 #endif /* TERMIO_TTY_DRIVER */
2051 #if defined (TERMIOS_TTY_DRIVER)
2052 if (tcsetattr (tty
, TCSADRAIN
, &shell_tty_info
) < 0)
2054 /* Only print an error message if we're really interactive at
2057 sys_error ("[%ld: %d (%d)] tcsetattr", (long)getpid (), shell_level
, tty
);
2060 #endif /* TERMIOS_TTY_DRIVER */
2065 /* Given an index into the jobs array JOB, return the PROCESS struct of the last
2066 process in that job's pipeline. This is the one whose exit status
2067 counts. Must be called with SIGCHLD blocked or queued. */
2069 find_last_proc (job
, block
)
2073 register PROCESS
*p
;
2077 BLOCK_CHILD (set
, oset
);
2079 p
= jobs
[job
]->pipe
;
2080 while (p
&& p
->next
!= jobs
[job
]->pipe
)
2084 UNBLOCK_CHILD (oset
);
2090 find_last_pid (job
, block
)
2096 p
= find_last_proc (job
, block
);
2097 /* Possible race condition here. */
2101 /* Wait for a particular child of the shell to finish executing.
2102 This low-level function prints an error message if PID is not
2103 a child of this shell. It returns -1 if it fails, or whatever
2104 wait_for returns otherwise. If the child is not found in the
2105 jobs table, it returns 127. */
2107 wait_for_single_pid (pid
)
2110 register PROCESS
*child
;
2114 BLOCK_CHILD (set
, oset
);
2115 child
= find_pipeline (pid
, 0, (int *)NULL
);
2116 UNBLOCK_CHILD (oset
);
2120 r
= bgp_search (pid
);
2127 internal_error (_("wait: pid %ld is not a child of this shell"), (long)pid
);
2133 /* POSIX.2: if we just waited for a job, we can remove it from the jobs
2135 BLOCK_CHILD (set
, oset
);
2136 job
= find_job (pid
, 0, NULL
);
2137 if (job
!= NO_JOB
&& jobs
[job
] && DEADJOB (job
))
2138 jobs
[job
]->flags
|= J_NOTIFIED
;
2139 UNBLOCK_CHILD (oset
);
2141 /* If running in posix mode, remove the job from the jobs table immediately */
2142 if (posixly_correct
)
2144 cleanup_dead_jobs ();
2151 /* Wait for all of the background processes started by this shell to finish. */
2153 wait_for_background_pids ()
2155 register int i
, r
, waited_for
;
2159 for (waited_for
= 0;;)
2161 BLOCK_CHILD (set
, oset
);
2163 /* find first running job; if none running in foreground, break */
2164 /* XXX could use js.j_firstj and js.j_lastj here */
2165 for (i
= 0; i
< js
.j_jobslots
; i
++)
2168 if (i
< js
.j_firstj
&& jobs
[i
])
2169 itrace("wait_for_background_pids: job %d non-null before js.j_firstj (%d)", i
, js
.j_firstj
);
2170 if (i
> js
.j_lastj
&& jobs
[i
])
2171 itrace("wait_for_background_pids: job %d non-null after js.j_lastj (%d)", i
, js
.j_lastj
);
2173 if (jobs
[i
] && RUNNING (i
) && IS_FOREGROUND (i
) == 0)
2176 if (i
== js
.j_jobslots
)
2178 UNBLOCK_CHILD (oset
);
2182 /* now wait for the last pid in that job. */
2183 pid
= find_last_pid (i
, 0);
2184 UNBLOCK_CHILD (oset
);
2186 errno
= 0; /* XXX */
2187 r
= wait_for_single_pid (pid
);
2190 /* If we're mistaken about job state, compensate. */
2191 if (errno
== ECHILD
)
2192 mark_all_jobs_as_dead ();
2198 /* POSIX.2 says the shell can discard the statuses of all completed jobs if
2199 `wait' is called with no arguments. */
2200 mark_dead_jobs_as_notified (1);
2201 cleanup_dead_jobs ();
2205 /* Make OLD_SIGINT_HANDLER the SIGINT signal handler. */
2206 #define INVALID_SIGNAL_HANDLER (SigHandler *)wait_for_background_pids
2207 static SigHandler
*old_sigint_handler
= INVALID_SIGNAL_HANDLER
;
2209 static int wait_sigint_received
;
2210 static int child_caught_sigint
;
2211 static int waiting_for_child
;
2214 restore_sigint_handler ()
2216 if (old_sigint_handler
!= INVALID_SIGNAL_HANDLER
)
2218 set_signal_handler (SIGINT
, old_sigint_handler
);
2219 old_sigint_handler
= INVALID_SIGNAL_HANDLER
;
2220 waiting_for_child
= 0;
2224 /* Handle SIGINT while we are waiting for children in a script to exit.
2225 The `wait' builtin should be interruptible, but all others should be
2226 effectively ignored (i.e. not cause the shell to exit). */
2228 wait_sigint_handler (sig
)
2231 SigHandler
*sigint_handler
;
2233 if (interrupt_immediately
||
2234 (this_shell_builtin
&& this_shell_builtin
== wait_builtin
))
2236 last_command_exit_value
= EXECUTION_FAILURE
;
2237 restore_sigint_handler ();
2238 /* If we got a SIGINT while in `wait', and SIGINT is trapped, do
2239 what POSIX.2 says (see builtins/wait.def for more info). */
2240 if (this_shell_builtin
&& this_shell_builtin
== wait_builtin
&&
2241 signal_is_trapped (SIGINT
) &&
2242 ((sigint_handler
= trap_to_sighandler (SIGINT
)) == trap_handler
))
2244 interrupt_immediately
= 0;
2245 trap_handler (SIGINT
); /* set pending_traps[SIGINT] */
2246 wait_signal_received
= SIGINT
;
2247 longjmp (wait_intr_buf
, 1);
2254 /* XXX - should this be interrupt_state? If it is, the shell will act
2255 as if it got the SIGINT interrupt. */
2256 if (waiting_for_child
)
2257 wait_sigint_received
= 1;
2260 last_command_exit_value
= 128+SIGINT
;
2261 restore_sigint_handler ();
2262 kill (getpid (), SIGINT
);
2265 /* Otherwise effectively ignore the SIGINT and allow the running job to
2271 process_exit_signal (status
)
2274 return (WIFSIGNALED (status
) ? WTERMSIG (status
) : 0);
2278 process_exit_status (status
)
2281 if (WIFSIGNALED (status
))
2282 return (128 + WTERMSIG (status
));
2283 else if (WIFSTOPPED (status
) == 0)
2284 return (WEXITSTATUS (status
));
2286 return (EXECUTION_SUCCESS
);
2290 job_signal_status (job
)
2293 register PROCESS
*p
;
2296 p
= jobs
[job
]->pipe
;
2300 if (WIFSIGNALED(s
) || WIFSTOPPED(s
))
2304 while (p
!= jobs
[job
]->pipe
);
2309 /* Return the exit status of the last process in the pipeline for job JOB.
2310 This is the exit status of the entire job. */
2312 raw_job_exit_status (job
)
2315 register PROCESS
*p
;
2322 p
= jobs
[job
]->pipe
;
2325 if (WSTATUS (p
->status
) != EXECUTION_SUCCESS
)
2326 fail
= WSTATUS(p
->status
);
2329 while (p
!= jobs
[job
]->pipe
);
2330 WSTATUS (ret
) = fail
;
2334 for (p
= jobs
[job
]->pipe
; p
->next
!= jobs
[job
]->pipe
; p
= p
->next
)
2339 /* Return the exit status of job JOB. This is the exit status of the last
2340 (rightmost) process in the job's pipeline, modified if the job was killed
2341 by a signal or stopped. */
2343 job_exit_status (job
)
2346 return (process_exit_status (raw_job_exit_status (job
)));
2350 job_exit_signal (job
)
2353 return (process_exit_signal (raw_job_exit_status (job
)));
2356 #define FIND_CHILD(pid, child) \
2359 child = find_pipeline (pid, 0, (int *)NULL); \
2362 give_terminal_to (shell_pgrp, 0); \
2363 UNBLOCK_CHILD (oset); \
2364 internal_error (_("wait_for: No record of process %ld"), (long)pid); \
2365 restore_sigint_handler (); \
2366 return (termination_state = 127); \
2371 /* Wait for pid (one of our children) to terminate, then
2372 return the termination state. Returns 127 if PID is not found in
2373 the jobs table. Returns -1 if waitchld() returns -1, indicating
2374 that there are no unwaited-for child processes. */
2379 int job
, termination_state
, r
;
2381 register PROCESS
*child
;
2384 /* In the case that this code is interrupted, and we longjmp () out of it,
2385 we are relying on the code in throw_to_top_level () to restore the
2386 top-level signal mask. */
2387 BLOCK_CHILD (set
, oset
);
2389 /* Ignore interrupts while waiting for a job run without job control
2390 to finish. We don't want the shell to exit if an interrupt is
2391 received, only if one of the jobs run is killed via SIGINT. If
2392 job control is not set, the job will be run in the same pgrp as
2393 the shell, and the shell will see any signals the job gets. In
2394 fact, we want this set every time the waiting shell and the waited-
2395 for process are in the same process group, including command
2398 /* This is possibly a race condition -- should it go in stop_pipeline? */
2399 wait_sigint_received
= child_caught_sigint
= 0;
2400 if (job_control
== 0 || (subshell_environment
&SUBSHELL_COMSUB
))
2402 old_sigint_handler
= set_signal_handler (SIGINT
, wait_sigint_handler
);
2403 waiting_for_child
= 0;
2404 if (old_sigint_handler
== SIG_IGN
)
2405 set_signal_handler (SIGINT
, old_sigint_handler
);
2408 termination_state
= last_command_exit_value
;
2410 if (interactive
&& job_control
== 0)
2412 /* Check for terminating signals and exit the shell if we receive one */
2415 /* If we say wait_for (), then we have a record of this child somewhere.
2416 If it and none of its peers are running, don't call waitchld(). */
2421 FIND_CHILD (pid
, child
);
2423 /* If this child is part of a job, then we are really waiting for the
2424 job to finish. Otherwise, we are waiting for the child to finish.
2425 We check for JDEAD in case the job state has been set by waitchld
2426 after receipt of a SIGCHLD. */
2428 job
= find_job (pid
, 0, NULL
);
2430 /* waitchld() takes care of setting the state of the job. If the job
2431 has already exited before this is called, sigchld_handler will have
2432 called waitchld and the state will be set to JDEAD. */
2434 if (PRUNNING(child
) || (job
!= NO_JOB
&& RUNNING (job
)))
2436 #if defined (WAITPID_BROKEN) /* SCOv4 */
2437 sigset_t suspend_set
;
2438 sigemptyset (&suspend_set
);
2439 sigsuspend (&suspend_set
);
2440 #else /* !WAITPID_BROKEN */
2441 # if defined (MUST_UNBLOCK_CHLD)
2442 struct sigaction act
, oact
;
2443 sigset_t nullset
, chldset
;
2445 sigemptyset (&nullset
);
2446 sigemptyset (&chldset
);
2447 sigprocmask (SIG_SETMASK
, &nullset
, &chldset
);
2448 act
.sa_handler
= SIG_DFL
;
2449 sigemptyset (&act
.sa_mask
);
2450 sigemptyset (&oact
.sa_mask
);
2452 sigaction (SIGCHLD
, &act
, &oact
);
2455 waiting_for_child
++;
2456 r
= waitchld (pid
, 1);
2457 waiting_for_child
--;
2458 # if defined (MUST_UNBLOCK_CHLD)
2459 sigaction (SIGCHLD
, &oact
, (struct sigaction
*)NULL
);
2460 sigprocmask (SIG_SETMASK
, &chldset
, (sigset_t
*)NULL
);
2463 if (r
== -1 && errno
== ECHILD
&& this_shell_builtin
== wait_builtin
)
2465 termination_state
= -1;
2466 goto wait_for_return
;
2469 /* If child is marked as running, but waitpid() returns -1/ECHILD,
2470 there is something wrong. Somewhere, wait should have returned
2471 that child's pid. Mark the child as not running and the job,
2472 if it exists, as JDEAD. */
2473 if (r
== -1 && errno
== ECHILD
)
2475 child
->running
= PS_DONE
;
2476 WSTATUS (child
->status
) = 0; /* XXX -- can't find true status */
2477 js
.c_living
= 0; /* no living child processes */
2480 jobs
[job
]->state
= JDEAD
;
2485 #endif /* WAITPID_BROKEN */
2488 /* If the shell is interactive, and job control is disabled, see
2489 if the foreground process has died due to SIGINT and jump out
2490 of the wait loop if it has. waitchld has already restored the
2491 old SIGINT signal handler. */
2492 if (interactive
&& job_control
== 0)
2494 /* Check for terminating signals and exit the shell if we receive one */
2497 while (PRUNNING (child
) || (job
!= NO_JOB
&& RUNNING (job
)));
2499 /* Restore the original SIGINT signal handler before we return. */
2500 restore_sigint_handler ();
2502 /* The exit state of the command is either the termination state of the
2503 child, or the termination state of the job. If a job, the status
2504 of the last child in the pipeline is the significant one. If the command
2505 or job was terminated by a signal, note that value also. */
2506 termination_state
= (job
!= NO_JOB
) ? job_exit_status (job
)
2507 : process_exit_status (child
->status
);
2508 last_command_exit_signal
= (job
!= NO_JOB
) ? job_exit_signal (job
)
2509 : process_exit_signal (child
->status
);
2512 if ((job
!= NO_JOB
&& JOBSTATE (job
) == JSTOPPED
) || WIFSTOPPED (child
->status
))
2513 termination_state
= 128 + WSTOPSIG (child
->status
);
2515 if (job
== NO_JOB
|| IS_JOBCONTROL (job
))
2517 /* XXX - under what circumstances is a job not present in the jobs
2518 table (job == NO_JOB)?
2519 1. command substitution
2521 In the case of command substitution, at least, it's probably not
2522 the right thing to give the terminal to the shell's process group,
2523 even though there is code in subst.c:command_substitute to work
2527 $PROMPT_COMMAND execution
2528 process substitution
2532 itrace("wait_for: job == NO_JOB, giving the terminal to shell_pgrp (%ld)", (long)shell_pgrp
);
2534 give_terminal_to (shell_pgrp
, 0);
2537 /* If the command did not exit cleanly, or the job is just
2538 being stopped, then reset the tty state back to what it
2539 was before this command. Reset the tty state and notify
2540 the user of the job termination only if the shell is
2541 interactive. Clean up any dead jobs in either case. */
2544 if (interactive_shell
&& subshell_environment
== 0)
2546 /* This used to use `child->status'. That's wrong, however, for
2547 pipelines. `child' is the first process in the pipeline. It's
2548 likely that the process we want to check for abnormal termination
2549 or stopping is the last process in the pipeline, especially if
2550 it's long-lived and the first process is short-lived. Since we
2551 know we have a job here, we can check all the processes in this
2552 job's pipeline and see if one of them stopped or terminated due
2553 to a signal. We might want to change this later to just check
2554 the last process in the pipeline. If no process exits due to a
2555 signal, S is left as the status of the last job in the pipeline. */
2556 s
= job_signal_status (job
);
2558 if (WIFSIGNALED (s
) || WIFSTOPPED (s
))
2562 /* If the current job was stopped or killed by a signal, and
2563 the user has requested it, get a possibly new window size */
2564 if (check_window_size
&& (job
== js
.j_current
|| IS_FOREGROUND (job
)))
2565 get_new_window_size (0, (int *)0, (int *)0);
2570 /* If job control is enabled, the job was started with job
2571 control, the job was the foreground job, and it was killed
2572 by SIGINT, then print a newline to compensate for the kernel
2573 printing the ^C without a trailing newline. */
2574 if (job_control
&& IS_JOBCONTROL (job
) && IS_FOREGROUND (job
) &&
2575 WIFSIGNALED (s
) && WTERMSIG (s
) == SIGINT
)
2577 /* If SIGINT is not trapped and the shell is in a for, while,
2578 or until loop, act as if the shell received SIGINT as
2579 well, so the loop can be broken. This doesn't call the
2580 SIGINT signal handler; maybe it should. */
2581 if (signal_is_trapped (SIGINT
) == 0 && (loop_level
|| (shell_compatibility_level
> 32 && executing_list
)))
2590 else if ((subshell_environment
& (SUBSHELL_COMSUB
|SUBSHELL_PIPE
)) && wait_sigint_received
)
2592 /* If waiting for a job in a subshell started to do command
2593 substitution or to run a pipeline element that consists of
2594 something like a while loop or a for loop, simulate getting
2595 and being killed by the SIGINT to pass the status back to our
2597 s
= job_signal_status (job
);
2599 if (child_caught_sigint
== 0 && signal_is_trapped (SIGINT
) == 0)
2601 UNBLOCK_CHILD (oset
);
2602 old_sigint_handler
= set_signal_handler (SIGINT
, SIG_DFL
);
2603 if (old_sigint_handler
== SIG_IGN
)
2604 restore_sigint_handler ();
2606 kill (getpid (), SIGINT
);
2609 else if (interactive_shell
== 0 && IS_FOREGROUND (job
) && check_window_size
)
2610 get_new_window_size (0, (int *)0, (int *)0);
2612 /* Moved here from set_job_status_and_cleanup, which is in the SIGCHLD
2613 signal handler path */
2614 if (DEADJOB (job
) && IS_FOREGROUND (job
) /*&& subshell_environment == 0*/)
2617 /* If this job is dead, notify the user of the status. If the shell
2618 is interactive, this will display a message on the terminal. If
2619 the shell is not interactive, make sure we turn on the notify bit
2620 so we don't get an unwanted message about the job's termination,
2621 and so delete_job really clears the slot in the jobs table. */
2622 notify_and_cleanup ();
2627 UNBLOCK_CHILD (oset
);
2629 return (termination_state
);
2632 /* Wait for the last process in the pipeline for JOB. Returns whatever
2633 wait_for returns: the last process's termination state or -1 if there
2634 are no unwaited-for child processes or an error occurs. */
2643 BLOCK_CHILD(set
, oset
);
2644 if (JOBSTATE (job
) == JSTOPPED
)
2645 internal_warning (_("wait_for_job: job %d is stopped"), job
+1);
2647 pid
= find_last_pid (job
, 0);
2648 UNBLOCK_CHILD(oset
);
2651 /* POSIX.2: we can remove the job from the jobs table if we just waited
2653 BLOCK_CHILD (set
, oset
);
2654 if (job
!= NO_JOB
&& jobs
[job
] && DEADJOB (job
))
2655 jobs
[job
]->flags
|= J_NOTIFIED
;
2656 UNBLOCK_CHILD (oset
);
2661 /* Print info about dead jobs, and then delete them from the list
2662 of known jobs. This does not actually delete jobs when the
2663 shell is not interactive, because the dead jobs are not marked
2666 notify_and_cleanup ()
2668 if (jobs_list_frozen
)
2671 if (interactive
|| interactive_shell
== 0 || sourcelevel
)
2672 notify_of_job_status ();
2674 cleanup_dead_jobs ();
2677 /* Make dead jobs disappear from the jobs array without notification.
2678 This is used when the shell is not interactive. */
2682 mark_dead_jobs_as_notified (0);
2683 cleanup_dead_jobs ();
2686 /* Return the next closest (chronologically) job to JOB which is in
2687 STATE. STATE can be JSTOPPED, JRUNNING. NO_JOB is returned if
2688 there is no next recent job. */
2690 most_recent_job_in_state (job
, state
)
2694 register int i
, result
;
2697 BLOCK_CHILD (set
, oset
);
2699 for (result
= NO_JOB
, i
= job
- 1; i
>= 0; i
--)
2701 if (jobs
[i
] && (JOBSTATE (i
) == state
))
2708 UNBLOCK_CHILD (oset
);
2713 /* Return the newest *stopped* job older than JOB, or NO_JOB if not
2716 job_last_stopped (job
)
2719 return (most_recent_job_in_state (job
, JSTOPPED
));
2722 /* Return the newest *running* job older than JOB, or NO_JOB if not
2725 job_last_running (job
)
2728 return (most_recent_job_in_state (job
, JRUNNING
));
2731 /* Make JOB be the current job, and make previous be useful. Must be
2732 called with SIGCHLD blocked. */
2734 set_current_job (job
)
2739 if (js
.j_current
!= job
)
2741 js
.j_previous
= js
.j_current
;
2745 /* First choice for previous job is the old current job. */
2746 if (js
.j_previous
!= js
.j_current
&&
2747 js
.j_previous
!= NO_JOB
&&
2748 jobs
[js
.j_previous
] &&
2749 STOPPED (js
.j_previous
))
2752 /* Second choice: Newest stopped job that is older than
2755 if (STOPPED (js
.j_current
))
2757 candidate
= job_last_stopped (js
.j_current
);
2759 if (candidate
!= NO_JOB
)
2761 js
.j_previous
= candidate
;
2766 /* If we get here, there is either only one stopped job, in which case it is
2767 the current job and the previous job should be set to the newest running
2768 job, or there are only running jobs and the previous job should be set to
2769 the newest running job older than the current job. We decide on which
2770 alternative to use based on whether or not JOBSTATE(js.j_current) is
2773 candidate
= RUNNING (js
.j_current
) ? job_last_running (js
.j_current
)
2774 : job_last_running (js
.j_jobslots
);
2776 if (candidate
!= NO_JOB
)
2778 js
.j_previous
= candidate
;
2782 /* There is only a single job, and it is both `+' and `-'. */
2783 js
.j_previous
= js
.j_current
;
2786 /* Make current_job be something useful, if it isn't already. */
2788 /* Here's the deal: The newest non-running job should be `+', and the
2789 next-newest non-running job should be `-'. If there is only a single
2790 stopped job, the js.j_previous is the newest non-running job. If there
2791 are only running jobs, the newest running job is `+' and the
2792 next-newest running job is `-'. Must be called with SIGCHLD blocked. */
2799 if (js
.j_jobslots
&& js
.j_current
!= NO_JOB
&& jobs
[js
.j_current
] && STOPPED (js
.j_current
))
2800 candidate
= js
.j_current
;
2805 /* First choice: the previous job. */
2806 if (js
.j_previous
!= NO_JOB
&& jobs
[js
.j_previous
] && STOPPED (js
.j_previous
))
2807 candidate
= js
.j_previous
;
2809 /* Second choice: the most recently stopped job. */
2810 if (candidate
== NO_JOB
)
2811 candidate
= job_last_stopped (js
.j_jobslots
);
2813 /* Third choice: the newest running job. */
2814 if (candidate
== NO_JOB
)
2815 candidate
= job_last_running (js
.j_jobslots
);
2818 /* If we found a job to use, then use it. Otherwise, there
2819 are no jobs period. */
2820 if (candidate
!= NO_JOB
)
2821 set_current_job (candidate
);
2823 js
.j_current
= js
.j_previous
= NO_JOB
;
2826 /* Set up the job structures so we know the job and its processes are
2829 set_job_running (job
)
2832 register PROCESS
*p
;
2834 /* Each member of the pipeline is now running. */
2835 p
= jobs
[job
]->pipe
;
2839 if (WIFSTOPPED (p
->status
))
2840 p
->running
= PS_RUNNING
; /* XXX - could be PS_STOPPED */
2843 while (p
!= jobs
[job
]->pipe
);
2845 /* This means that the job is running. */
2846 JOBSTATE (job
) = JRUNNING
;
2849 /* Start a job. FOREGROUND if non-zero says to do that. Otherwise,
2850 start the job in the background. JOB is a zero-based index into
2851 JOBS. Returns -1 if it is unable to start a job, and the return
2852 status of the job otherwise. */
2854 start_job (job
, foreground
)
2855 int job
, foreground
;
2857 register PROCESS
*p
;
2858 int already_running
;
2861 static TTYSTRUCT save_stty
;
2863 BLOCK_CHILD (set
, oset
);
2867 internal_error (_("%s: job has terminated"), this_command_name
);
2868 UNBLOCK_CHILD (oset
);
2872 already_running
= RUNNING (job
);
2874 if (foreground
== 0 && already_running
)
2876 internal_error (_("%s: job %d already in background"), this_command_name
, job
+ 1);
2877 UNBLOCK_CHILD (oset
);
2878 return (0); /* XPG6/SUSv3 says this is not an error */
2881 wd
= current_working_directory ();
2883 /* You don't know about the state of this job. Do you? */
2884 jobs
[job
]->flags
&= ~J_NOTIFIED
;
2888 set_current_job (job
);
2889 jobs
[job
]->flags
|= J_FOREGROUND
;
2892 /* Tell the outside world what we're doing. */
2893 p
= jobs
[job
]->pipe
;
2895 if (foreground
== 0)
2897 /* POSIX.2 says `bg' doesn't give any indication about current or
2899 if (posixly_correct
== 0)
2900 s
= (job
== js
.j_current
) ? "+ ": ((job
== js
.j_previous
) ? "- " : " ");
2903 printf ("[%d]%s", job
+ 1, s
);
2909 p
->command
? p
->command
: "",
2910 p
->next
!= jobs
[job
]->pipe
? " | " : "");
2913 while (p
!= jobs
[job
]->pipe
);
2915 if (foreground
== 0)
2918 if (strcmp (wd
, jobs
[job
]->wd
) != 0)
2919 printf (" (wd: %s)", polite_directory_format (jobs
[job
]->wd
));
2924 if (already_running
== 0)
2925 set_job_running (job
);
2927 /* Save the tty settings before we start the job in the foreground. */
2931 save_stty
= shell_tty_info
;
2932 /* Give the terminal to this job. */
2933 if (IS_JOBCONTROL (job
))
2934 give_terminal_to (jobs
[job
]->pgrp
, 0);
2937 jobs
[job
]->flags
&= ~J_FOREGROUND
;
2939 /* If the job is already running, then don't bother jump-starting it. */
2940 if (already_running
== 0)
2942 jobs
[job
]->flags
|= J_NOTIFIED
;
2943 killpg (jobs
[job
]->pgrp
, SIGCONT
);
2951 pid
= find_last_pid (job
, 0);
2952 UNBLOCK_CHILD (oset
);
2953 st
= wait_for (pid
);
2954 shell_tty_info
= save_stty
;
2961 UNBLOCK_CHILD (oset
);
2966 /* Give PID SIGNAL. This determines what job the pid belongs to (if any).
2967 If PID does belong to a job, and the job is stopped, then CONTinue the
2968 job after giving it SIGNAL. Returns -1 on failure. If GROUP is non-null,
2969 then kill the process group associated with PID. */
2971 kill_pid (pid
, sig
, group
)
2975 register PROCESS
*p
;
2976 int job
, result
, negative
;
2982 group
= negative
= 1;
2987 result
= EXECUTION_SUCCESS
;
2990 BLOCK_CHILD (set
, oset
);
2991 p
= find_pipeline (pid
, 0, &job
);
2995 jobs
[job
]->flags
&= ~J_NOTIFIED
;
2997 /* Kill process in backquotes or one started without job control? */
2999 /* If we're passed a pid < -1, just call killpg and see what happens */
3000 if (negative
&& jobs
[job
]->pgrp
== shell_pgrp
)
3001 result
= killpg (pid
, sig
);
3002 /* If we're killing using job control notification, for example,
3003 without job control active, we have to do things ourselves. */
3004 else if (jobs
[job
]->pgrp
== shell_pgrp
)
3006 p
= jobs
[job
]->pipe
;
3009 if (PALIVE (p
) == 0)
3010 continue; /* avoid pid recycling problem */
3012 if (PEXITED (p
) && (sig
== SIGTERM
|| sig
== SIGHUP
))
3013 kill (p
->pid
, SIGCONT
);
3016 while (p
!= jobs
[job
]->pipe
);
3020 result
= killpg (jobs
[job
]->pgrp
, sig
);
3021 if (p
&& STOPPED (job
) && (sig
== SIGTERM
|| sig
== SIGHUP
))
3022 killpg (jobs
[job
]->pgrp
, SIGCONT
);
3023 /* If we're continuing a stopped job via kill rather than bg or
3024 fg, emulate the `bg' behavior. */
3025 if (p
&& STOPPED (job
) && (sig
== SIGCONT
))
3027 set_job_running (job
);
3028 jobs
[job
]->flags
&= ~J_FOREGROUND
;
3029 jobs
[job
]->flags
|= J_NOTIFIED
;
3034 result
= killpg (pid
, sig
);
3036 UNBLOCK_CHILD (oset
);
3039 result
= kill (pid
, sig
);
3044 /* sigchld_handler () flushes at least one of the children that we are
3045 waiting for. It gets run when we have gotten a SIGCHLD signal. */
3047 sigchld_handler (sig
)
3053 REINSTALL_SIGCHLD_HANDLER
;
3056 if (queue_sigchld
== 0)
3057 n
= waitchld (-1, 0);
3062 /* waitchld() reaps dead or stopped children. It's called by wait_for and
3063 sigchld_handler, and runs until there aren't any children terminating any
3065 If BLOCK is 1, this is to be a blocking wait for a single child, although
3066 an arriving SIGCHLD could cause the wait to be non-blocking. It returns
3067 the number of children reaped, or -1 if there are no unwaited-for child
3070 waitchld (wpid
, block
)
3077 int call_set_current
, last_stopped_job
, job
, children_exited
, waitpid_flags
;
3078 static int wcontinued
= WCONTINUED
; /* run-time fix for glibc problem */
3080 call_set_current
= children_exited
= 0;
3081 last_stopped_job
= NO_JOB
;
3085 /* We don't want to be notified about jobs stopping if job control
3086 is not active. XXX - was interactive_shell instead of job_control */
3087 waitpid_flags
= (job_control
&& subshell_environment
== 0)
3088 ? (WUNTRACED
|wcontinued
)
3090 if (sigchld
|| block
== 0)
3091 waitpid_flags
|= WNOHANG
;
3092 /* Check for terminating signals and exit the shell if we receive one */
3095 if (block
== 1 && queue_sigchld
== 0 && (waitpid_flags
& WNOHANG
) == 0)
3097 internal_warning (_("waitchld: turning on WNOHANG to avoid indefinite block"));
3098 waitpid_flags
|= WNOHANG
;
3101 pid
= WAITPID (-1, &status
, waitpid_flags
);
3103 /* WCONTINUED may be rejected by waitpid as invalid even when defined */
3104 if (wcontinued
&& pid
< 0 && errno
== EINVAL
)
3107 continue; /* jump back to the test and retry without WCONTINUED */
3110 /* The check for WNOHANG is to make sure we decrement sigchld only
3111 if it was non-zero before we called waitpid. */
3112 if (sigchld
> 0 && (waitpid_flags
& WNOHANG
))
3115 /* If waitpid returns -1 with errno == ECHILD, there are no more
3116 unwaited-for child processes of this shell. */
3117 if (pid
< 0 && errno
== ECHILD
)
3119 if (children_exited
== 0)
3125 /* If waitpid returns 0, there are running children. If it returns -1,
3126 the only other error POSIX says it can return is EINTR. */
3129 /* If waitpid returns -1/EINTR and the shell saw a SIGINT, then we
3130 assume the child has blocked or handled SIGINT. In that case, we
3131 require the child to actually die due to SIGINT to act on the
3132 SIGINT we received; otherwise we assume the child handled it and
3134 if (pid
< 0 && errno
== EINTR
&& wait_sigint_received
)
3135 child_caught_sigint
= 1;
3138 continue; /* jumps right to the test */
3140 /* If the child process did die due to SIGINT, forget our assumption
3141 that it caught or otherwise handled it. */
3142 if (WIFSIGNALED (status
) && WTERMSIG (status
) == SIGINT
)
3143 child_caught_sigint
= 0;
3145 /* children_exited is used to run traps on SIGCHLD. We don't want to
3146 run the trap if a process is just being continued. */
3147 if (WIFCONTINUED(status
) == 0)
3153 /* Locate our PROCESS for this pid. */
3154 child
= find_process (pid
, 1, &job
); /* want living procs only */
3156 #if defined (COPROCESS_SUPPORT)
3157 coproc_pidchk (pid
, status
);
3160 /* It is not an error to have a child terminate that we did
3161 not have a record of. This child could have been part of
3162 a pipeline in backquote substitution. Even so, I'm not
3163 sure child is ever non-zero. */
3166 if (WIFEXITED (status
) || WIFSIGNALED (status
))
3171 /* Remember status, and whether or not the process is running. */
3172 child
->status
= status
;
3173 child
->running
= WIFCONTINUED(status
) ? PS_RUNNING
: PS_DONE
;
3175 if (PEXITED (child
))
3185 call_set_current
+= set_job_status_and_cleanup (job
);
3188 last_stopped_job
= job
;
3189 else if (DEADJOB (job
) && last_stopped_job
== job
)
3190 last_stopped_job
= NO_JOB
;
3192 while ((sigchld
|| block
== 0) && pid
> (pid_t
)0);
3194 /* If a job was running and became stopped, then set the current
3195 job. Otherwise, don't change a thing. */
3196 if (call_set_current
)
3198 if (last_stopped_job
!= NO_JOB
)
3199 set_current_job (last_stopped_job
);
3204 /* Call a SIGCHLD trap handler for each child that exits, if one is set. */
3205 if (job_control
&& signal_is_trapped (SIGCHLD
) && children_exited
&&
3206 trap_list
[SIGCHLD
] != (char *)IGNORE_SIG
)
3208 if (posixly_correct
&& this_shell_builtin
&& this_shell_builtin
== wait_builtin
)
3210 interrupt_immediately
= 0;
3211 trap_handler (SIGCHLD
); /* set pending_traps[SIGCHLD] */
3212 wait_signal_received
= SIGCHLD
;
3213 longjmp (wait_intr_buf
, 1);
3215 else if (sigchld
) /* called from signal handler */
3216 queue_sigchld_trap (children_exited
);
3218 run_sigchld_trap (children_exited
);
3221 /* We have successfully recorded the useful information about this process
3222 that has just changed state. If we notify asynchronously, and the job
3223 that this process belongs to is no longer running, then notify the user
3224 of that fact now. */
3225 if (asynchronous_notification
&& interactive
)
3226 notify_of_job_status ();
3228 return (children_exited
);
3231 /* Set the status of JOB and perform any necessary cleanup if the job is
3234 Currently, the cleanup activity is restricted to handling any SIGINT
3235 received while waiting for a foreground job to finish. */
3237 set_job_status_and_cleanup (job
)
3241 int tstatus
, job_state
, any_stopped
, any_tstped
, call_set_current
;
3242 SigHandler
*temp_handler
;
3244 child
= jobs
[job
]->pipe
;
3245 jobs
[job
]->flags
&= ~J_NOTIFIED
;
3247 call_set_current
= 0;
3250 * COMPUTE JOB STATUS
3253 /* If all children are not running, but any of them is stopped, then
3254 the job is stopped, not dead. */
3255 job_state
= any_stopped
= any_tstped
= 0;
3258 job_state
|= PRUNNING (child
);
3260 if (PEXITED (child
) && (WIFSTOPPED (child
->status
)))
3262 /* Only checking for WIFSTOPPED now, not for PS_DONE */
3263 if (PSTOPPED (child
))
3267 any_tstped
|= job_control
&& (WSTOPSIG (child
->status
) == SIGTSTP
);
3269 child
= child
->next
;
3271 while (child
!= jobs
[job
]->pipe
);
3273 /* If job_state != 0, the job is still running, so don't bother with
3274 setting the process exit status and job state unless we're
3275 transitioning from stopped to running. */
3276 if (job_state
!= 0 && JOBSTATE(job
) != JSTOPPED
)
3283 /* The job is either stopped or dead. Set the state of the job accordingly. */
3286 jobs
[job
]->state
= JSTOPPED
;
3287 jobs
[job
]->flags
&= ~J_FOREGROUND
;
3289 /* Suspending a job with SIGTSTP breaks all active loops. */
3290 if (any_tstped
&& loop_level
)
3291 breaking
= loop_level
;
3293 else if (job_state
!= 0) /* was stopped, now running */
3295 jobs
[job
]->state
= JRUNNING
;
3300 jobs
[job
]->state
= JDEAD
;
3304 if (IS_FOREGROUND (job
))
3308 /* If this job has a cleanup function associated with it, call it
3309 with `cleanarg' as the single argument, then set the function
3310 pointer to NULL so it is not inadvertently called twice. The
3311 cleanup function is responsible for deallocating cleanarg. */
3312 if (jobs
[job
]->j_cleanup
)
3314 (*jobs
[job
]->j_cleanup
) (jobs
[job
]->cleanarg
);
3315 jobs
[job
]->j_cleanup
= (sh_vptrfunc_t
*)NULL
;
3322 * Currently, we just do special things if we got a SIGINT while waiting
3323 * for a foreground job to complete
3326 if (JOBSTATE (job
) == JDEAD
)
3328 /* If we're running a shell script and we get a SIGINT with a
3329 SIGINT trap handler, but the foreground job handles it and
3330 does not exit due to SIGINT, run the trap handler but do not
3331 otherwise act as if we got the interrupt. */
3332 if (wait_sigint_received
&& interactive_shell
== 0 &&
3333 child_caught_sigint
&& IS_FOREGROUND (job
) &&
3334 signal_is_trapped (SIGINT
))
3337 wait_sigint_received
= 0;
3338 last_command_exit_value
= process_exit_status (child
->status
);
3340 old_frozen
= jobs_list_frozen
;
3341 jobs_list_frozen
= 1;
3342 tstatus
= maybe_call_trap_handler (SIGINT
);
3343 jobs_list_frozen
= old_frozen
;
3346 /* If the foreground job is killed by SIGINT when job control is not
3347 active, we need to perform some special handling.
3349 The check of wait_sigint_received is a way to determine if the
3350 SIGINT came from the keyboard (in which case the shell has already
3351 seen it, and wait_sigint_received is non-zero, because keyboard
3352 signals are sent to process groups) or via kill(2) to the foreground
3353 process by another process (or itself). If the shell did receive the
3354 SIGINT, it needs to perform normal SIGINT processing. */
3355 else if (wait_sigint_received
&&
3356 child_caught_sigint
== 0 &&
3357 IS_FOREGROUND (job
) && IS_JOBCONTROL (job
) == 0)
3361 wait_sigint_received
= 0;
3363 /* If SIGINT is trapped, set the exit status so that the trap
3364 handler can see it. */
3365 if (signal_is_trapped (SIGINT
))
3366 last_command_exit_value
= process_exit_status (child
->status
);
3368 /* If the signal is trapped, let the trap handler get it no matter
3369 what and simply return if the trap handler returns.
3370 maybe_call_trap_handler() may cause dead jobs to be removed from
3371 the job table because of a call to execute_command. We work
3372 around this by setting JOBS_LIST_FROZEN. */
3373 old_frozen
= jobs_list_frozen
;
3374 jobs_list_frozen
= 1;
3375 tstatus
= maybe_call_trap_handler (SIGINT
);
3376 jobs_list_frozen
= old_frozen
;
3377 if (tstatus
== 0 && old_sigint_handler
!= INVALID_SIGNAL_HANDLER
)
3379 /* wait_sigint_handler () has already seen SIGINT and
3380 allowed the wait builtin to jump out. We need to
3381 call the original SIGINT handler, if necessary. If
3382 the original handler is SIG_DFL, we need to resend
3383 the signal to ourselves. */
3385 temp_handler
= old_sigint_handler
;
3387 /* Bogus. If we've reset the signal handler as the result
3388 of a trap caught on SIGINT, then old_sigint_handler
3389 will point to trap_handler, which now knows nothing about
3390 SIGINT (if we reset the sighandler to the default).
3391 In this case, we have to fix things up. What a crock. */
3392 if (temp_handler
== trap_handler
&& signal_is_trapped (SIGINT
) == 0)
3393 temp_handler
= trap_to_sighandler (SIGINT
);
3394 restore_sigint_handler ();
3395 if (temp_handler
== SIG_DFL
)
3396 termsig_handler (SIGINT
); /* XXX */
3397 else if (temp_handler
!= SIG_IGN
)
3398 (*temp_handler
) (SIGINT
);
3403 return call_set_current
;
3406 /* Build the array of values for the $PIPESTATUS variable from the set of
3407 exit statuses of all processes in the job J. */
3412 #if defined (ARRAY_VARS)
3414 register PROCESS
*p
;
3416 for (i
= 1, p
= jobs
[j
]->pipe
; p
->next
!= jobs
[j
]->pipe
; p
= p
->next
, i
++)
3421 pstatuses
= (int *)xrealloc (pstatuses
, i
* sizeof (int));
3428 pstatuses
[i
++] = process_exit_status (p
->status
);
3431 while (p
!= jobs
[j
]->pipe
);
3433 pstatuses
[i
] = -1; /* sentinel */
3434 set_pipestatus_array (pstatuses
, i
);
3439 run_sigchld_trap (nchild
)
3445 /* Turn off the trap list during the call to parse_and_execute ()
3446 to avoid potentially infinite recursive calls. Preserve the
3447 values of last_command_exit_value, last_made_pid, and the_pipeline
3448 around the execution of the trap commands. */
3449 trap_command
= savestring (trap_list
[SIGCHLD
]);
3451 begin_unwind_frame ("SIGCHLD trap");
3452 unwind_protect_int (last_command_exit_value
);
3453 unwind_protect_int (last_command_exit_signal
);
3454 unwind_protect_var (last_made_pid
);
3455 unwind_protect_int (interrupt_immediately
);
3456 unwind_protect_int (jobs_list_frozen
);
3457 unwind_protect_pointer (the_pipeline
);
3458 unwind_protect_pointer (subst_assign_varlist
);
3460 /* We have to add the commands this way because they will be run
3461 in reverse order of adding. We don't want maybe_set_sigchld_trap ()
3462 to reference freed memory. */
3463 add_unwind_protect (xfree
, trap_command
);
3464 add_unwind_protect (maybe_set_sigchld_trap
, trap_command
);
3466 subst_assign_varlist
= (WORD_LIST
*)NULL
;
3467 the_pipeline
= (PROCESS
*)NULL
;
3469 set_impossible_sigchld_trap ();
3470 jobs_list_frozen
= 1;
3471 for (i
= 0; i
< nchild
; i
++)
3473 interrupt_immediately
= 1;
3474 parse_and_execute (savestring (trap_command
), "trap", SEVAL_NOHIST
|SEVAL_RESETLINE
);
3477 run_unwind_frame ("SIGCHLD trap");
3480 /* Function to call when you want to notify people of changes
3481 in job status. This prints out all jobs which are pending
3482 notification to stderr, and marks those printed as already
3483 notified, thus making them candidates for cleanup. */
3485 notify_of_job_status ()
3487 register int job
, termsig
;
3492 if (jobs
== 0 || js
.j_jobslots
== 0)
3498 sigaddset (&set
, SIGCHLD
);
3499 sigaddset (&set
, SIGTTOU
);
3500 sigemptyset (&oset
);
3501 sigprocmask (SIG_BLOCK
, &set
, &oset
);
3506 /* XXX could use js.j_firstj here */
3507 for (job
= 0, dir
= (char *)NULL
; job
< js
.j_jobslots
; job
++)
3509 if (jobs
[job
] && IS_NOTIFIED (job
) == 0)
3511 s
= raw_job_exit_status (job
);
3512 termsig
= WTERMSIG (s
);
3514 /* POSIX.2 says we have to hang onto the statuses of at most the
3515 last CHILD_MAX background processes if the shell is running a
3516 script. If the shell is running a script, either from a file
3517 or standard input, don't print anything unless the job was
3518 killed by a signal. */
3519 if (startup_state
== 0 && WIFSIGNALED (s
) == 0 &&
3520 ((DEADJOB (job
) && IS_FOREGROUND (job
) == 0) || STOPPED (job
)))
3524 /* If job control is disabled, don't print the status messages.
3525 Mark dead jobs as notified so that they get cleaned up. If
3526 startup_state == 2, we were started to run `-c command', so
3527 don't print anything. */
3528 if ((job_control
== 0 && interactive_shell
) || startup_state
== 2)
3530 /* If job control is disabled, don't print the status messages.
3531 Mark dead jobs as notified so that they get cleaned up. If
3532 startup_state == 2 and subshell_environment has the
3533 SUBSHELL_COMSUB bit turned on, we were started to run a command
3534 substitution, so don't print anything. */
3535 if ((job_control
== 0 && interactive_shell
) ||
3536 (startup_state
== 2 && (subshell_environment
& SUBSHELL_COMSUB
)))
3539 /* POSIX.2 compatibility: if the shell is not interactive,
3540 hang onto the job corresponding to the last asynchronous
3541 pid until the user has been notified of its status or does
3543 if (DEADJOB (job
) && (interactive_shell
|| (find_last_pid (job
, 0) != last_asynchronous_pid
)))
3544 jobs
[job
]->flags
|= J_NOTIFIED
;
3548 /* Print info on jobs that are running in the background,
3549 and on foreground jobs that were killed by anything
3550 except SIGINT (and possibly SIGPIPE). */
3551 switch (JOBSTATE (job
))
3554 if (interactive_shell
== 0 && termsig
&& WIFSIGNALED (s
) &&
3555 termsig
!= SIGINT
&&
3556 #if defined (DONT_REPORT_SIGTERM)
3557 termsig
!= SIGTERM
&&
3559 #if defined (DONT_REPORT_SIGPIPE)
3560 termsig
!= SIGPIPE
&&
3562 signal_is_trapped (termsig
) == 0)
3564 /* Don't print `0' for a line number. */
3565 fprintf (stderr
, _("%s: line %d: "), get_name_for_error (), (line_number
== 0) ? 1 : line_number
);
3566 pretty_print_job (job
, JLIST_NONINTERACTIVE
, stderr
);
3568 else if (IS_FOREGROUND (job
))
3570 #if !defined (DONT_REPORT_SIGPIPE)
3571 if (termsig
&& WIFSIGNALED (s
) && termsig
!= SIGINT
)
3573 if (termsig
&& WIFSIGNALED (s
) && termsig
!= SIGINT
&& termsig
!= SIGPIPE
)
3576 fprintf (stderr
, "%s", j_strsignal (termsig
));
3579 fprintf (stderr
, _(" (core dumped)"));
3581 fprintf (stderr
, "\n");
3584 else if (job_control
) /* XXX job control test added */
3587 dir
= current_working_directory ();
3588 pretty_print_job (job
, JLIST_STANDARD
, stderr
);
3589 if (dir
&& strcmp (dir
, jobs
[job
]->wd
) != 0)
3591 _("(wd now: %s)\n"), polite_directory_format (dir
));
3594 jobs
[job
]->flags
|= J_NOTIFIED
;
3598 fprintf (stderr
, "\n");
3600 dir
= current_working_directory ();
3601 pretty_print_job (job
, JLIST_STANDARD
, stderr
);
3602 if (dir
&& (strcmp (dir
, jobs
[job
]->wd
) != 0))
3604 _("(wd now: %s)\n"), polite_directory_format (dir
));
3605 jobs
[job
]->flags
|= J_NOTIFIED
;
3613 programming_error ("notify_of_job_status");
3618 sigprocmask (SIG_SETMASK
, &oset
, (sigset_t
*)NULL
);
3623 /* Initialize the job control mechanism, and set up the tty stuff. */
3625 initialize_job_control (force
)
3632 shell_pgrp
= getpgid (0);
3634 if (shell_pgrp
== -1)
3636 sys_error (_("initialize_job_control: getpgrp failed"));
3640 /* We can only have job control if we are interactive unless we force it. */
3641 if (interactive
== 0 && force
== 0)
3644 original_pgrp
= NO_PID
;
3645 shell_tty
= fileno (stderr
);
3651 /* If forced_interactive is set, we skip the normal check that stderr
3652 is attached to a tty, so we need to check here. If it's not, we
3653 need to see whether we have a controlling tty by opening /dev/tty,
3654 since trying to use job control tty pgrp manipulations on a non-tty
3655 is going to fail. */
3656 if (forced_interactive
&& isatty (fileno (stderr
)) == 0)
3657 shell_tty
= open ("/dev/tty", O_RDWR
|O_NONBLOCK
);
3659 /* Get our controlling terminal. If job_control is set, or
3660 interactive is set, then this is an interactive shell no
3661 matter where fd 2 is directed. */
3662 if (shell_tty
== -1)
3663 shell_tty
= dup (fileno (stderr
)); /* fd 2 */
3665 if (shell_tty
!= -1)
3666 shell_tty
= move_to_high_fd (shell_tty
, 1, -1);
3668 /* Compensate for a bug in systems that compiled the BSD
3669 rlogind with DEBUG defined, like NeXT and Alliant. */
3670 if (shell_pgrp
== 0)
3672 shell_pgrp
= getpid ();
3673 setpgid (0, shell_pgrp
);
3674 tcsetpgrp (shell_tty
, shell_pgrp
);
3677 while ((terminal_pgrp
= tcgetpgrp (shell_tty
)) != -1)
3679 if (shell_pgrp
!= terminal_pgrp
)
3683 ottin
= set_signal_handler(SIGTTIN
, SIG_DFL
);
3685 set_signal_handler (SIGTTIN
, ottin
);
3691 if (terminal_pgrp
== -1)
3694 /* Make sure that we are using the new line discipline. */
3695 if (set_new_line_discipline (shell_tty
) < 0)
3697 sys_error (_("initialize_job_control: line discipline"));
3702 original_pgrp
= shell_pgrp
;
3703 shell_pgrp
= getpid ();
3705 if ((original_pgrp
!= shell_pgrp
) && (setpgid (0, shell_pgrp
) < 0))
3707 sys_error (_("initialize_job_control: setpgid"));
3708 shell_pgrp
= original_pgrp
;
3713 /* If (and only if) we just set our process group to our pid,
3714 thereby becoming a process group leader, and the terminal
3715 is not in the same process group as our (new) process group,
3716 then set the terminal's process group to our (new) process
3717 group. If that fails, set our process group back to what it
3718 was originally (so we can still read from the terminal) and
3719 turn off job control. */
3720 if (shell_pgrp
!= original_pgrp
&& shell_pgrp
!= terminal_pgrp
)
3722 if (give_terminal_to (shell_pgrp
, 0) < 0)
3725 setpgid (0, original_pgrp
);
3726 shell_pgrp
= original_pgrp
;
3728 sys_error (_("cannot set terminal process group (%d)"), shell_pgrp
);
3733 if (job_control
&& ((t
= tcgetpgrp (shell_tty
)) == -1 || t
!= shell_pgrp
))
3737 sys_error (_("cannot set terminal process group (%d)"), t
);
3741 if (job_control
== 0)
3742 internal_error (_("no job control in this shell"));
3745 if (shell_tty
!= fileno (stderr
))
3746 SET_CLOSE_ON_EXEC (shell_tty
);
3748 set_signal_handler (SIGCHLD
, sigchld_handler
);
3750 change_flag ('m', job_control
? '-' : '+');
3755 if (js
.c_childmax
< 0)
3756 js
.c_childmax
= getmaxchild ();
3757 if (js
.c_childmax
< 0)
3758 js
.c_childmax
= DEFAULT_CHILD_MAX
;
3765 debug_print_pgrps ()
3767 itrace("original_pgrp = %ld shell_pgrp = %ld terminal_pgrp = %ld",
3768 (long)original_pgrp
, (long)shell_pgrp
, (long)terminal_pgrp
);
3769 itrace("tcgetpgrp(%d) -> %ld, getpgid(0) -> %ld",
3770 shell_tty
, (long)tcgetpgrp (shell_tty
), (long)getpgid(0));
3774 /* Set the line discipline to the best this system has to offer.
3775 Return -1 if this is not possible. */
3777 set_new_line_discipline (tty
)
3780 #if defined (NEW_TTY_DRIVER)
3783 if (ioctl (tty
, TIOCGETD
, &ldisc
) < 0)
3786 if (ldisc
!= NTTYDISC
)
3790 if (ioctl (tty
, TIOCSETD
, &ldisc
) < 0)
3794 #endif /* NEW_TTY_DRIVER */
3796 #if defined (TERMIO_TTY_DRIVER)
3797 # if defined (TERMIO_LDISC) && (NTTYDISC)
3798 if (ioctl (tty
, TCGETA
, &shell_tty_info
) < 0)
3801 if (shell_tty_info
.c_line
!= NTTYDISC
)
3803 shell_tty_info
.c_line
= NTTYDISC
;
3804 if (ioctl (tty
, TCSETAW
, &shell_tty_info
) < 0)
3807 # endif /* TERMIO_LDISC && NTTYDISC */
3809 #endif /* TERMIO_TTY_DRIVER */
3811 #if defined (TERMIOS_TTY_DRIVER)
3812 # if defined (TERMIOS_LDISC) && defined (NTTYDISC)
3813 if (tcgetattr (tty
, &shell_tty_info
) < 0)
3816 if (shell_tty_info
.c_line
!= NTTYDISC
)
3818 shell_tty_info
.c_line
= NTTYDISC
;
3819 if (tcsetattr (tty
, TCSADRAIN
, &shell_tty_info
) < 0)
3822 # endif /* TERMIOS_LDISC && NTTYDISC */
3824 #endif /* TERMIOS_TTY_DRIVER */
3826 #if !defined (NEW_TTY_DRIVER) && !defined (TERMIO_TTY_DRIVER) && !defined (TERMIOS_TTY_DRIVER)
3831 /* Setup this shell to handle C-C, etc. */
3833 initialize_job_signals ()
3837 set_signal_handler (SIGINT
, sigint_sighandler
);
3838 set_signal_handler (SIGTSTP
, SIG_IGN
);
3839 set_signal_handler (SIGTTOU
, SIG_IGN
);
3840 set_signal_handler (SIGTTIN
, SIG_IGN
);
3842 else if (job_control
)
3844 old_tstp
= set_signal_handler (SIGTSTP
, sigstop_sighandler
);
3845 old_ttin
= set_signal_handler (SIGTTIN
, sigstop_sighandler
);
3846 old_ttou
= set_signal_handler (SIGTTOU
, sigstop_sighandler
);
3848 /* Leave these things alone for non-interactive shells without job
3852 /* Here we handle CONT signals. */
3854 sigcont_sighandler (sig
)
3857 initialize_job_signals ();
3858 set_signal_handler (SIGCONT
, old_cont
);
3859 kill (getpid (), SIGCONT
);
3864 /* Here we handle stop signals while we are running not as a login shell. */
3866 sigstop_sighandler (sig
)
3869 set_signal_handler (SIGTSTP
, old_tstp
);
3870 set_signal_handler (SIGTTOU
, old_ttou
);
3871 set_signal_handler (SIGTTIN
, old_ttin
);
3873 old_cont
= set_signal_handler (SIGCONT
, sigcont_sighandler
);
3875 give_terminal_to (shell_pgrp
, 0);
3877 kill (getpid (), sig
);
3882 /* Give the terminal to PGRP. */
3884 give_terminal_to (pgrp
, force
)
3892 if (job_control
|| force
)
3895 sigaddset (&set
, SIGTTOU
);
3896 sigaddset (&set
, SIGTTIN
);
3897 sigaddset (&set
, SIGTSTP
);
3898 sigaddset (&set
, SIGCHLD
);
3899 sigemptyset (&oset
);
3900 sigprocmask (SIG_BLOCK
, &set
, &oset
);
3902 if (tcsetpgrp (shell_tty
, pgrp
) < 0)
3904 /* Maybe we should print an error message? */
3906 sys_error ("tcsetpgrp(%d) failed: pid %ld to pgrp %ld",
3907 shell_tty
, (long)getpid(), (long)pgrp
);
3913 terminal_pgrp
= pgrp
;
3914 sigprocmask (SIG_SETMASK
, &oset
, (sigset_t
*)NULL
);
3923 /* Give terminal to NPGRP iff it's currently owned by OPGRP. FLAGS are the
3924 flags to pass to give_terminal_to(). */
3926 maybe_give_terminal_to (opgrp
, npgrp
, flags
)
3932 tpgrp
= tcgetpgrp (shell_tty
);
3933 if (tpgrp
< 0 && errno
== ENOTTY
)
3937 terminal_pgrp
= npgrp
;
3940 else if (tpgrp
!= opgrp
)
3943 internal_warning ("maybe_give_terminal_to: terminal pgrp == %d shell pgrp = %d new pgrp = %d", tpgrp
, opgrp
, npgrp
);
3948 return (give_terminal_to (npgrp
, flags
));
3951 /* Clear out any jobs in the job array. This is intended to be used by
3952 children of the shell, who should not have any job structures as baggage
3953 when they start executing (forking subshells for parenthesized execution
3954 and functions with pipes are the two that spring to mind). If RUNNING_ONLY
3955 is nonzero, only running jobs are removed from the table. */
3957 delete_all_jobs (running_only
)
3963 BLOCK_CHILD (set
, oset
);
3965 /* XXX - need to set j_lastj, j_firstj appropriately if running_only != 0. */
3968 js
.j_current
= js
.j_previous
= NO_JOB
;
3970 /* XXX could use js.j_firstj here */
3971 for (i
= 0; i
< js
.j_jobslots
; i
++)
3974 if (i
< js
.j_firstj
&& jobs
[i
])
3975 itrace("delete_all_jobs: job %d non-null before js.j_firstj (%d)", i
, js
.j_firstj
);
3976 if (i
> js
.j_lastj
&& jobs
[i
])
3977 itrace("delete_all_jobs: job %d non-null after js.j_lastj (%d)", i
, js
.j_lastj
);
3979 if (jobs
[i
] && (running_only
== 0 || (running_only
&& RUNNING(i
))))
3980 delete_job (i
, DEL_WARNSTOPPED
);
3982 if (running_only
== 0)
3984 free ((char *)jobs
);
3986 js
.j_firstj
= js
.j_lastj
= js
.j_njobs
= 0;
3990 if (running_only
== 0)
3993 UNBLOCK_CHILD (oset
);
3996 /* Mark all jobs in the job array so that they don't get a SIGHUP when the
3997 shell gets one. If RUNNING_ONLY is nonzero, mark only running jobs. */
3999 nohup_all_jobs (running_only
)
4005 BLOCK_CHILD (set
, oset
);
4009 /* XXX could use js.j_firstj here */
4010 for (i
= 0; i
< js
.j_jobslots
; i
++)
4011 if (jobs
[i
] && (running_only
== 0 || (running_only
&& RUNNING(i
))))
4015 UNBLOCK_CHILD (oset
);
4024 /* This really counts all non-dead jobs. */
4025 BLOCK_CHILD (set
, oset
);
4026 /* XXX could use js.j_firstj here */
4027 for (i
= n
= 0; i
< js
.j_jobslots
; i
++)
4030 if (i
< js
.j_firstj
&& jobs
[i
])
4031 itrace("count_all_jobs: job %d non-null before js.j_firstj (%d)", i
, js
.j_firstj
);
4032 if (i
> js
.j_lastj
&& jobs
[i
])
4033 itrace("count_all_jobs: job %d non-null after js.j_lastj (%d)", i
, js
.j_lastj
);
4035 if (jobs
[i
] && DEADJOB(i
) == 0)
4038 UNBLOCK_CHILD (oset
);
4043 mark_all_jobs_as_dead ()
4048 if (js
.j_jobslots
== 0)
4051 BLOCK_CHILD (set
, oset
);
4053 /* XXX could use js.j_firstj here */
4054 for (i
= 0; i
< js
.j_jobslots
; i
++)
4057 jobs
[i
]->state
= JDEAD
;
4061 UNBLOCK_CHILD (oset
);
4064 /* Mark all dead jobs as notified, so delete_job () cleans them out
4065 of the job table properly. POSIX.2 says we need to save the
4066 status of the last CHILD_MAX jobs, so we count the number of dead
4067 jobs and mark only enough as notified to save CHILD_MAX statuses. */
4069 mark_dead_jobs_as_notified (force
)
4072 register int i
, ndead
, ndeadproc
;
4075 if (js
.j_jobslots
== 0)
4078 BLOCK_CHILD (set
, oset
);
4080 /* If FORCE is non-zero, we don't have to keep CHILD_MAX statuses
4081 around; just run through the array. */
4084 /* XXX could use js.j_firstj here */
4085 for (i
= 0; i
< js
.j_jobslots
; i
++)
4087 if (jobs
[i
] && DEADJOB (i
) && (interactive_shell
|| (find_last_pid (i
, 0) != last_asynchronous_pid
)))
4088 jobs
[i
]->flags
|= J_NOTIFIED
;
4090 UNBLOCK_CHILD (oset
);
4094 /* Mark enough dead jobs as notified to keep CHILD_MAX processes left in the
4095 array with the corresponding not marked as notified. This is a better
4096 way to avoid pid aliasing and reuse problems than keeping the POSIX-
4097 mandated CHILD_MAX jobs around. delete_job() takes care of keeping the
4098 bgpids list regulated. */
4100 /* Count the number of dead jobs */
4101 /* XXX could use js.j_firstj here */
4102 for (i
= ndead
= ndeadproc
= 0; i
< js
.j_jobslots
; i
++)
4105 if (i
< js
.j_firstj
&& jobs
[i
])
4106 itrace("mark_dead_jobs_as_notified: job %d non-null before js.j_firstj (%d)", i
, js
.j_firstj
);
4107 if (i
> js
.j_lastj
&& jobs
[i
])
4108 itrace("mark_dead_jobs_as_notified: job %d non-null after js.j_lastj (%d)", i
, js
.j_lastj
);
4110 if (jobs
[i
] && DEADJOB (i
))
4113 ndeadproc
+= processes_in_job (i
);
4118 if (ndeadproc
!= js
.c_reaped
)
4119 itrace("mark_dead_jobs_as_notified: ndeadproc (%d) != js.c_reaped (%d)", ndeadproc
, js
.c_reaped
);
4120 if (ndead
!= js
.j_ndead
)
4121 itrace("mark_dead_jobs_as_notified: ndead (%d) != js.j_ndead (%d)", ndead
, js
.j_ndead
);
4124 if (js
.c_childmax
< 0)
4125 js
.c_childmax
= getmaxchild ();
4126 if (js
.c_childmax
< 0)
4127 js
.c_childmax
= DEFAULT_CHILD_MAX
;
4129 /* Don't do anything if the number of dead processes is less than CHILD_MAX
4130 and we're not forcing a cleanup. */
4131 if (ndeadproc
<= js
.c_childmax
)
4133 UNBLOCK_CHILD (oset
);
4138 itrace("mark_dead_jobs_as_notified: child_max = %d ndead = %d ndeadproc = %d", js
.c_childmax
, ndead
, ndeadproc
);
4141 /* Mark enough dead jobs as notified that we keep CHILD_MAX jobs in
4142 the list. This isn't exactly right yet; changes need to be made
4143 to stop_pipeline so we don't mark the newer jobs after we've
4144 created CHILD_MAX slots in the jobs array. This needs to be
4145 integrated with a way to keep the jobs array from growing without
4146 bound. Maybe we wrap back around to 0 after we reach some max
4147 limit, and there are sufficient job slots free (keep track of total
4148 size of jobs array (js.j_jobslots) and running count of number of jobs
4149 in jobs array. Then keep a job index corresponding to the `oldest job'
4150 and start this loop there, wrapping around as necessary. In effect,
4151 we turn the list into a circular buffer. */
4152 /* XXX could use js.j_firstj here */
4153 for (i
= 0; i
< js
.j_jobslots
; i
++)
4155 if (jobs
[i
] && DEADJOB (i
) && (interactive_shell
|| (find_last_pid (i
, 0) != last_asynchronous_pid
)))
4158 if (i
< js
.j_firstj
&& jobs
[i
])
4159 itrace("mark_dead_jobs_as_notified: job %d non-null before js.j_firstj (%d)", i
, js
.j_firstj
);
4160 if (i
> js
.j_lastj
&& jobs
[i
])
4161 itrace("mark_dead_jobs_as_notified: job %d non-null after js.j_lastj (%d)", i
, js
.j_lastj
);
4163 /* If marking this job as notified would drop us down below
4164 child_max, don't mark it so we can keep at least child_max
4165 statuses. XXX -- need to check what Posix actually says
4166 about keeping statuses. */
4167 if ((ndeadproc
-= processes_in_job (i
)) <= js
.c_childmax
)
4169 jobs
[i
]->flags
|= J_NOTIFIED
;
4173 UNBLOCK_CHILD (oset
);
4176 /* Here to allow other parts of the shell (like the trap stuff) to
4177 freeze and unfreeze the jobs list. */
4181 jobs_list_frozen
= 1;
4185 unfreeze_jobs_list ()
4187 jobs_list_frozen
= 0;
4190 /* Allow or disallow job control to take place. Returns the old value
4193 set_job_control (arg
)
4201 /* If we're turning on job control, reset pipeline_pgrp so make_child will
4202 put new child processes into the right pgrp */
4203 if (job_control
!= old
&& job_control
)
4209 /* Turn off all traces of job control. This is run by children of the shell
4210 which are going to do shellsy things, like wait (), etc. */
4212 without_job_control ()
4214 stop_making_children ();
4216 #if defined (PGRP_PIPE)
4217 sh_closepipe (pgrp_pipe
);
4219 delete_all_jobs (0);
4220 set_job_control (0);
4223 /* If this shell is interactive, terminate all stopped jobs and
4224 restore the original terminal process group. This is done
4225 before the `exec' builtin calls shell_execve. */
4229 if (interactive_shell
) /* XXX - should it be interactive? */
4231 terminate_stopped_jobs ();
4233 if (original_pgrp
>= 0)
4234 give_terminal_to (original_pgrp
, 1);
4237 if (original_pgrp
>= 0)
4238 setpgid (0, original_pgrp
);
4241 /* Restart job control by closing shell tty and reinitializing. This is
4242 called after an exec fails in an interactive shell and we do not exit. */
4244 restart_job_control ()
4246 if (shell_tty
!= -1)
4248 initialize_job_control (0);
4252 set_maxchild (nchild
)
4255 static int lmaxchild
= -1;
4258 lmaxchild
= getmaxchild ();
4260 lmaxchild
= DEFAULT_CHILD_MAX
;
4262 /* Clamp value we set. Minimum is what Posix requires, maximum is defined
4263 above as MAX_CHILD_MAX. */
4264 if (nchild
< lmaxchild
)
4266 else if (nchild
> MAX_CHILD_MAX
)
4267 nchild
= MAX_CHILD_MAX
;
4269 js
.c_childmax
= nchild
;
4272 /* Set the handler to run when the shell receives a SIGCHLD signal. */
4274 set_sigchld_handler ()
4276 set_signal_handler (SIGCHLD
, sigchld_handler
);
4279 #if defined (PGRP_PIPE)
4280 /* Read from the read end of a pipe. This is how the process group leader
4281 blocks until all of the processes in a pipeline have been made. */
4296 while (read (pp
[0], &ch
, 1) == -1 && errno
== EINTR
)
4301 /* Functional interface closes our local-to-job-control pipes. */
4305 sh_closepipe (pgrp_pipe
);
4309 save_pgrp_pipe (p
, clear
)
4313 p
[0] = pgrp_pipe
[0];
4314 p
[1] = pgrp_pipe
[1];
4316 pgrp_pipe
[0] = pgrp_pipe
[1] = -1;
4320 restore_pgrp_pipe (p
)
4323 pgrp_pipe
[0] = p
[0];
4324 pgrp_pipe
[1] = p
[1];
4327 #endif /* PGRP_PIPE */