1 /* The thing that makes children, remembers them, and contains wait loops. */
3 /* This file works with both POSIX and BSD systems. It implements job
6 /* Copyright (C) 1989-2006 Free Software Foundation, Inc.
8 This file is part of GNU Bash, the Bourne Again SHell.
10 Bash is free software; you can redistribute it and/or modify it under
11 the terms of the GNU General Public License as published by the Free
12 Software Foundation; either version 2, or (at your option) any later
15 Bash is distributed in the hope that it will be useful, but WITHOUT ANY
16 WARRANTY; without even the implied warranty of MERCHANTABILITY or
17 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
20 You should have received a copy of the GNU General Public License along
21 with Bash; see the file COPYING. If not, write to the Free Software
22 Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
26 #include "bashtypes.h"
32 #if defined (HAVE_UNISTD_H)
36 #include "posixtime.h"
38 #if defined (HAVE_SYS_RESOURCE_H) && defined (HAVE_WAIT3) && !defined (_POSIX_VERSION) && !defined (RLIMTYPE)
39 # include <sys/resource.h>
40 #endif /* !_POSIX_VERSION && HAVE_SYS_RESOURCE_H && HAVE_WAIT3 && !RLIMTYPE */
42 #if defined (HAVE_SYS_FILE_H)
43 # include <sys/file.h>
47 #include <sys/ioctl.h>
48 #include <sys/param.h>
50 #if defined (BUFFERED_INPUT)
54 /* Need to include this up here for *_TTY_DRIVER definitions. */
57 /* Define this if your output is getting swallowed. It's a no-op on
58 machines with the termio or termios tty drivers. */
59 /* #define DRAIN_OUTPUT */
61 /* For the TIOCGPGRP and TIOCSPGRP ioctl parameters on HP-UX */
62 #if defined (hpux) && !defined (TERMIOS_TTY_DRIVER)
64 #endif /* hpux && !TERMIOS_TTY_DRIVER */
72 #include "builtins/builtext.h"
73 #include "builtins/common.h"
79 #define DEFAULT_CHILD_MAX 32
81 #define MAX_JOBS_IN_ARRAY 4096 /* production */
83 #define MAX_JOBS_IN_ARRAY 128 /* testing */
86 /* Flag values for second argument to delete_job */
87 #define DEL_WARNSTOPPED 1 /* warn about deleting stopped jobs */
88 #define DEL_NOBGPID 2 /* don't add pgrp leader to bgpids */
90 /* Take care of system dependencies that must be handled when waiting for
91 children. The arguments to the WAITPID macro match those to the Posix.1
92 waitpid() function. */
94 #if defined (ultrix) && defined (mips) && defined (_POSIX_VERSION)
95 # define WAITPID(pid, statusp, options) \
96 wait3 ((union wait *)statusp, options, (struct rusage *)0)
98 # if defined (_POSIX_VERSION) || defined (HAVE_WAITPID)
99 # define WAITPID(pid, statusp, options) \
100 waitpid ((pid_t)pid, statusp, options)
102 # if defined (HAVE_WAIT3)
103 # define WAITPID(pid, statusp, options) \
104 wait3 (statusp, options, (struct rusage *)0)
106 # define WAITPID(pid, statusp, options) \
107 wait3 (statusp, options, (int *)0)
108 # endif /* HAVE_WAIT3 */
109 # endif /* !_POSIX_VERSION && !HAVE_WAITPID*/
110 #endif /* !(Ultrix && mips && _POSIX_VERSION) */
112 /* getpgrp () varies between systems. Even systems that claim to be
113 Posix.1 compatible lie sometimes (Ultrix, SunOS4, apollo). */
114 #if defined (GETPGRP_VOID)
115 # define getpgid(p) getpgrp ()
117 # define getpgid(p) getpgrp (p)
118 #endif /* !GETPGRP_VOID */
120 /* If the system needs it, REINSTALL_SIGCHLD_HANDLER will reinstall the
121 handler for SIGCHLD. */
122 #if defined (MUST_REINSTALL_SIGHANDLERS)
123 # define REINSTALL_SIGCHLD_HANDLER signal (SIGCHLD, sigchld_handler)
125 # define REINSTALL_SIGCHLD_HANDLER
126 #endif /* !MUST_REINSTALL_SIGHANDLERS */
128 /* Some systems let waitpid(2) tell callers about stopped children. */
129 #if !defined (WCONTINUED) || defined (WCONTINUED_BROKEN)
131 # define WCONTINUED 0
133 #if !defined (WIFCONTINUED)
134 # define WIFCONTINUED(s) (0)
137 /* The number of additional slots to allocate when we run out. */
140 typedef int sh_job_map_func_t
__P((JOB
*, int, int, int));
142 /* Variables used here but defined in other files. */
143 extern int subshell_environment
, line_number
;
144 extern int posixly_correct
, shell_level
;
145 extern int interrupt_immediately
;
146 extern int last_command_exit_value
, last_command_exit_signal
;
147 extern int loop_level
, breaking
;
148 extern int sourcelevel
;
149 extern sh_builtin_func_t
*this_shell_builtin
;
150 extern char *shell_name
, *this_command_name
;
151 extern sigset_t top_level_mask
;
152 extern procenv_t wait_intr_buf
;
153 extern int wait_signal_received
;
154 extern WORD_LIST
*subst_assign_varlist
;
156 static struct jobstats zerojs
= { -1L, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, NO_JOB
, NO_JOB
, 0, 0 };
157 struct jobstats js
= { -1L, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, NO_JOB
, NO_JOB
, 0, 0 };
159 struct bgpids bgpids
= { 0, 0, 0 };
161 /* The array of known jobs. */
162 JOB
**jobs
= (JOB
**)NULL
;
165 /* The number of slots currently allocated to JOBS. */
169 /* The controlling tty for this shell. */
172 /* The shell's process group. */
173 pid_t shell_pgrp
= NO_PID
;
175 /* The terminal's process group. */
176 pid_t terminal_pgrp
= NO_PID
;
178 /* The process group of the shell's parent. */
179 pid_t original_pgrp
= NO_PID
;
181 /* The process group of the pipeline currently being made. */
182 pid_t pipeline_pgrp
= (pid_t
)0;
184 #if defined (PGRP_PIPE)
185 /* Pipes which each shell uses to communicate with the process group leader
186 until all of the processes in a pipeline have been started. Then the
187 process leader is allowed to continue. */
188 int pgrp_pipe
[2] = { -1, -1 };
192 /* The job which is current; i.e. the one that `%+' stands for. */
193 int current_job
= NO_JOB
;
195 /* The previous job; i.e. the one that `%-' stands for. */
196 int previous_job
= NO_JOB
;
199 /* Last child made by the shell. */
200 pid_t last_made_pid
= NO_PID
;
202 /* Pid of the last asynchronous child. */
203 pid_t last_asynchronous_pid
= NO_PID
;
205 /* The pipeline currently being built. */
206 PROCESS
*the_pipeline
= (PROCESS
*)NULL
;
208 /* If this is non-zero, do job control. */
211 /* Call this when you start making children. */
212 int already_making_children
= 0;
214 /* If this is non-zero, $LINES and $COLUMNS are reset after every process
215 exits from get_tty_state(). */
216 int check_window_size
;
218 /* Functions local to this file. */
220 static void run_sigchld_trap
__P((int));
222 static sighandler wait_sigint_handler
__P((int));
223 static sighandler sigchld_handler
__P((int));
224 static sighandler sigcont_sighandler
__P((int));
225 static sighandler sigstop_sighandler
__P((int));
227 static int waitchld
__P((pid_t
, int));
229 static PROCESS
*find_pipeline
__P((pid_t
, int, int *));
230 static PROCESS
*find_process
__P((pid_t
, int, int *));
232 static char *current_working_directory
__P((void));
233 static char *job_working_directory
__P((void));
234 static char *j_strsignal
__P((int));
235 static char *printable_job_status
__P((int, PROCESS
*, int));
237 static PROCESS
*find_last_proc
__P((int, int));
238 static pid_t find_last_pid
__P((int, int));
240 static int set_new_line_discipline
__P((int));
241 static int map_over_jobs
__P((sh_job_map_func_t
*, int, int));
242 static int job_last_stopped
__P((int));
243 static int job_last_running
__P((int));
244 static int most_recent_job_in_state
__P((int, JOB_STATE
));
245 static int find_job
__P((pid_t
, int, PROCESS
**));
246 static int print_job
__P((JOB
*, int, int, int));
247 static int process_exit_status
__P((WAIT
));
248 static int process_exit_signal
__P((WAIT
));
249 static int job_exit_status
__P((int));
250 static int job_exit_signal
__P((int));
251 static int set_job_status_and_cleanup
__P((int));
253 static WAIT raw_job_exit_status
__P((int));
255 static void notify_of_job_status
__P((void));
256 static void reset_job_indices
__P((void));
257 static void cleanup_dead_jobs
__P((void));
258 static int processes_in_job
__P((int));
259 static void realloc_jobs_list
__P((void));
260 static int compact_jobs_list
__P((int));
261 static int discard_pipeline
__P((PROCESS
*));
262 static void add_process
__P((char *, pid_t
));
263 static void print_pipeline
__P((PROCESS
*, int, int, FILE *));
264 static void pretty_print_job
__P((int, int, FILE *));
265 static void set_current_job
__P((int));
266 static void reset_current
__P((void));
267 static void set_job_running
__P((int));
268 static void setjstatus
__P((int));
269 static void mark_all_jobs_as_dead
__P((void));
270 static void mark_dead_jobs_as_notified
__P((int));
271 static void restore_sigint_handler
__P((void));
272 #if defined (PGRP_PIPE)
273 static void pipe_read
__P((int *));
274 static void pipe_close
__P((int *));
277 static struct pidstat
*bgp_alloc
__P((pid_t
, int));
278 static struct pidstat
*bgp_add
__P((pid_t
, int));
279 static int bgp_delete
__P((pid_t
));
280 static void bgp_clear
__P((void));
281 static int bgp_search
__P((pid_t
));
282 static void bgp_prune
__P((void));
284 #if defined (ARRAY_VARS)
285 static int *pstatuses
; /* list of pipeline statuses */
289 /* Used to synchronize between wait_for and other functions and the SIGCHLD
292 static int queue_sigchld
;
294 #define QUEUE_SIGCHLD(os) (os) = sigchld, queue_sigchld++
296 #define UNQUEUE_SIGCHLD(os) \
299 if (queue_sigchld == 0 && os != sigchld) \
303 static SigHandler
*old_tstp
, *old_ttou
, *old_ttin
;
304 static SigHandler
*old_cont
= (SigHandler
*)SIG_DFL
;
306 /* A place to temporarily save the current pipeline. */
307 static PROCESS
*saved_pipeline
;
308 static int saved_already_making_children
;
310 /* Set this to non-zero whenever you don't want the jobs list to change at
311 all: no jobs deleted and no status change notifications. This is used,
312 for example, when executing SIGCHLD traps, which may run arbitrary
314 static int jobs_list_frozen
;
316 static char retcode_name_buffer
[64];
318 /* flags to detect pid wraparound */
319 static pid_t first_pid
= NO_PID
;
320 static int pid_wrap
= -1;
322 #if !defined (_POSIX_VERSION)
324 /* These are definitions to map POSIX 1003.1 functions onto existing BSD
325 library functions and system calls. */
326 #define setpgid(pid, pgrp) setpgrp (pid, pgrp)
327 #define tcsetpgrp(fd, pgrp) ioctl ((fd), TIOCSPGRP, &(pgrp))
335 /* ioctl will handle setting errno correctly. */
336 if (ioctl (fd
, TIOCGPGRP
, &pgrp
) < 0)
341 #endif /* !_POSIX_VERSION */
343 /* Initialize the global job stats structure and other bookkeeping variables */
352 /* Return the working directory for the current process. Unlike
353 job_working_directory, this does not call malloc (), nor do any
354 of the functions it calls. This is so that it can safely be called
355 from a signal handler. */
357 current_working_directory ()
360 static char d
[PATH_MAX
];
362 dir
= get_string_value ("PWD");
364 if (dir
== 0 && the_current_working_directory
&& no_symbolic_links
)
365 dir
= the_current_working_directory
;
369 dir
= getcwd (d
, sizeof(d
));
374 return (dir
== 0) ? "<unknown>" : dir
;
377 /* Return the working directory for the current process. */
379 job_working_directory ()
383 dir
= get_string_value ("PWD");
385 return (savestring (dir
));
387 dir
= get_working_directory ("job-working-directory");
391 return (savestring ("<unknown>"));
397 if (already_making_children
)
400 already_making_children
= 1;
405 stop_making_children ()
407 already_making_children
= 0;
411 cleanup_the_pipeline ()
416 BLOCK_CHILD (set
, oset
);
417 disposer
= the_pipeline
;
418 the_pipeline
= (PROCESS
*)NULL
;
419 UNBLOCK_CHILD (oset
);
422 discard_pipeline (disposer
);
426 save_pipeline (clear
)
429 saved_pipeline
= the_pipeline
;
431 the_pipeline
= (PROCESS
*)NULL
;
432 saved_already_making_children
= already_making_children
;
436 restore_pipeline (discard
)
439 PROCESS
*old_pipeline
;
441 old_pipeline
= the_pipeline
;
442 the_pipeline
= saved_pipeline
;
443 already_making_children
= saved_already_making_children
;
445 discard_pipeline (old_pipeline
);
448 /* Start building a pipeline. */
454 cleanup_the_pipeline ();
456 #if defined (PGRP_PIPE)
457 pipe_close (pgrp_pipe
);
461 #if defined (PGRP_PIPE)
464 if (pipe (pgrp_pipe
) == -1)
465 sys_error ("start_pipeline: pgrp pipe");
470 /* Stop building a pipeline. Install the process list in the job array.
471 This returns the index of the newly installed job.
472 DEFERRED is a command structure to be executed upon satisfactory
473 execution exit of this pipeline. */
475 stop_pipeline (async
, deferred
)
483 BLOCK_CHILD (set
, oset
);
485 #if defined (PGRP_PIPE)
486 /* The parent closes the process group synchronization pipe. */
487 pipe_close (pgrp_pipe
);
490 cleanup_dead_jobs ();
492 if (js
.j_jobslots
== 0)
494 js
.j_jobslots
= JOB_SLOTS
;
495 jobs
= (JOB
**)xmalloc (js
.j_jobslots
* sizeof (JOB
*));
497 /* Now blank out these new entries. */
498 for (i
= 0; i
< js
.j_jobslots
; i
++)
499 jobs
[i
] = (JOB
*)NULL
;
501 js
.j_firstj
= js
.j_lastj
= js
.j_njobs
= 0;
504 /* Scan from the last slot backward, looking for the next free one. */
505 /* XXX - revisit this interactive assumption */
506 /* XXX - this way for now */
509 for (i
= js
.j_jobslots
; i
; i
--)
516 /* This wraps around, but makes it inconvenient to extend the array */
517 for (i
= js
.j_lastj
+1; i
!= js
.j_lastj
; i
++)
519 if (i
>= js
.j_jobslots
)
527 /* This doesn't wrap around yet. */
528 for (i
= js
.j_lastj
? js
.j_lastj
+ 1 : js
.j_lastj
; i
< js
.j_jobslots
; i
++)
534 /* Do we need more room? */
536 /* First try compaction */
537 if ((interactive_shell
== 0 || subshell_environment
) && i
== js
.j_jobslots
&& js
.j_jobslots
>= MAX_JOBS_IN_ARRAY
)
538 i
= compact_jobs_list (0);
540 /* If we can't compact, reallocate */
541 if (i
== js
.j_jobslots
)
543 js
.j_jobslots
+= JOB_SLOTS
;
544 jobs
= (JOB
**)xrealloc (jobs
, (js
.j_jobslots
* sizeof (JOB
*)));
546 for (j
= i
; j
< js
.j_jobslots
; j
++)
547 jobs
[j
] = (JOB
*)NULL
;
550 /* Add the current pipeline to the job list. */
554 int any_running
, any_stopped
, n
;
556 newjob
= (JOB
*)xmalloc (sizeof (JOB
));
558 for (n
= 1, p
= the_pipeline
; p
->next
!= the_pipeline
; n
++, p
= p
->next
)
560 p
->next
= (PROCESS
*)NULL
;
561 newjob
->pipe
= REVERSE_LIST (the_pipeline
, PROCESS
*);
562 for (p
= newjob
->pipe
; p
->next
; p
= p
->next
)
564 p
->next
= newjob
->pipe
;
566 the_pipeline
= (PROCESS
*)NULL
;
567 newjob
->pgrp
= pipeline_pgrp
;
572 /* Flag to see if in another pgrp. */
574 newjob
->flags
|= J_JOBCONTROL
;
576 /* Set the state of this pipeline. */
578 any_running
= any_stopped
= 0;
581 any_running
|= PRUNNING (p
);
582 any_stopped
|= PSTOPPED (p
);
585 while (p
!= newjob
->pipe
);
587 newjob
->state
= any_running
? JRUNNING
: (any_stopped
? JSTOPPED
: JDEAD
);
588 newjob
->wd
= job_working_directory ();
589 newjob
->deferred
= deferred
;
591 newjob
->j_cleanup
= (sh_vptrfunc_t
*)NULL
;
592 newjob
->cleanarg
= (PTR_T
) NULL
;
595 if (newjob
->state
== JDEAD
&& (newjob
->flags
& J_FOREGROUND
))
597 if (newjob
->state
== JDEAD
)
599 js
.c_reaped
+= n
; /* wouldn't have been done since this was not part of a job */
608 newjob
= (JOB
*)NULL
;
611 js
.j_lastmade
= newjob
;
617 newjob
->flags
&= ~J_FOREGROUND
;
618 newjob
->flags
|= J_ASYNC
;
619 js
.j_lastasync
= newjob
;
627 newjob
->flags
|= J_FOREGROUND
;
629 * !!!!! NOTE !!!!! (chet@ins.cwru.edu)
631 * The currently-accepted job control wisdom says to set the
632 * terminal's process group n+1 times in an n-step pipeline:
633 * once in the parent and once in each child. This is where
634 * the parent gives it away.
636 * Don't give the terminal away if this shell is an asynchronous
640 if (job_control
&& newjob
->pgrp
&& (subshell_environment
&SUBSHELL_ASYNC
) == 0)
641 give_terminal_to (newjob
->pgrp
, 0);
645 stop_making_children ();
646 UNBLOCK_CHILD (oset
);
647 return (js
.j_current
);
650 /* Functions to manage the list of exited background pids whose status has
653 static struct pidstat
*
654 bgp_alloc (pid
, status
)
660 ps
= (struct pidstat
*)xmalloc (sizeof (struct pidstat
));
663 ps
->next
= (struct pidstat
*)0;
667 static struct pidstat
*
668 bgp_add (pid
, status
)
674 ps
= bgp_alloc (pid
, status
);
676 if (bgpids
.list
== 0)
678 bgpids
.list
= bgpids
.end
= ps
;
679 bgpids
.npid
= 0; /* just to make sure */
683 bgpids
.end
->next
= ps
;
688 if (bgpids
.npid
> js
.c_childmax
)
698 struct pidstat
*prev
, *p
;
700 for (prev
= p
= bgpids
.list
; p
; prev
= p
, p
= p
->next
)
703 prev
->next
= p
->next
; /* remove from list */
708 return 0; /* not found */
711 itrace("bgp_delete: deleting %d", pid
);
714 /* Housekeeping in the border cases. */
715 if (p
== bgpids
.list
)
716 bgpids
.list
= bgpids
.list
->next
;
717 else if (p
== bgpids
.end
)
721 if (bgpids
.npid
== 0)
722 bgpids
.list
= bgpids
.end
= 0;
723 else if (bgpids
.npid
== 1)
724 bgpids
.end
= bgpids
.list
; /* just to make sure */
730 /* Clear out the list of saved statuses */
734 struct pidstat
*ps
, *p
;
736 for (ps
= bgpids
.list
; ps
; )
742 bgpids
.list
= bgpids
.end
= 0;
746 /* Search for PID in the list of saved background pids; return its status if
747 found. If not found, return -1. */
754 for (ps
= bgpids
.list
; ps
; ps
= ps
->next
)
763 struct pidstat
*ps
, *p
;
765 while (bgpids
.npid
> js
.c_childmax
)
768 bgpids
.list
= bgpids
.list
->next
;
774 /* Reset the values of js.j_lastj and js.j_firstj after one or both have
775 been deleted. The caller should check whether js.j_njobs is 0 before
776 calling this. This wraps around, but the rest of the code does not. At
777 this point, it should not matter. */
783 if (jobs
[js
.j_firstj
] == 0)
786 while (js
.j_firstj
!= old
)
788 if (js
.j_firstj
>= js
.j_jobslots
)
790 if (jobs
[js
.j_firstj
])
794 if (js
.j_firstj
== old
)
795 js
.j_firstj
= js
.j_lastj
= js
.j_njobs
= 0;
797 if (jobs
[js
.j_lastj
] == 0)
800 while (js
.j_lastj
!= old
)
803 js
.j_lastj
= js
.j_jobslots
- 1;
804 if (jobs
[js
.j_lastj
])
808 if (js
.j_lastj
== old
)
809 js
.j_firstj
= js
.j_lastj
= js
.j_njobs
= 0;
813 /* Delete all DEAD jobs that the user had received notification about. */
820 if (js
.j_jobslots
== 0 || jobs_list_frozen
)
825 /* XXX could use js.j_firstj and js.j_lastj here */
826 for (i
= 0; i
< js
.j_jobslots
; i
++)
829 if (i
< js
.j_firstj
&& jobs
[i
])
830 itrace("cleanup_dead_jobs: job %d non-null before js.j_firstj (%d)", i
, js
.j_firstj
);
831 if (i
> js
.j_lastj
&& jobs
[i
])
832 itrace("cleanup_dead_jobs: job %d non-null after js.j_lastj (%d)", i
, js
.j_lastj
);
835 if (jobs
[i
] && DEADJOB (i
) && IS_NOTIFIED (i
))
842 processes_in_job (job
)
854 while (p
!= jobs
[job
]->pipe
);
866 job
= find_job (pid
, 0, &p
);
870 itrace ("delete_old_job: found pid %d in job %d with state %d", pid
, job
, jobs
[job
]->state
);
872 if (JOBSTATE (job
) == JDEAD
)
873 delete_job (job
, DEL_NOBGPID
);
876 internal_warning (_("forked pid %d appears in running job %d"), pid
, job
);
883 /* Reallocate and compress the jobs list. This returns with a jobs array
884 whose size is a multiple of JOB_SLOTS and can hold the current number of
885 jobs. Heuristics are used to minimize the number of new reallocs. */
890 int nsize
, i
, j
, ncur
, nprev
;
893 ncur
= nprev
= NO_JOB
;
894 nsize
= ((js
.j_njobs
+ JOB_SLOTS
- 1) / JOB_SLOTS
);
896 i
= js
.j_njobs
% JOB_SLOTS
;
897 if (i
== 0 || i
> (JOB_SLOTS
>> 1))
900 BLOCK_CHILD (set
, oset
);
901 nlist
= (js
.j_jobslots
== nsize
) ? jobs
: (JOB
**) xmalloc (nsize
* sizeof (JOB
*));
903 for (i
= j
= 0; i
< js
.j_jobslots
; i
++)
906 if (i
== js
.j_current
)
908 if (i
== js
.j_previous
)
910 nlist
[j
++] = jobs
[i
];
914 itrace ("realloc_jobs_list: resize jobs list from %d to %d", js
.j_jobslots
, nsize
);
915 itrace ("realloc_jobs_list: j_lastj changed from %d to %d", js
.j_lastj
, (j
> 0) ? j
- 1 : 0);
916 itrace ("realloc_jobs_list: j_njobs changed from %d to %d", js
.j_njobs
, (j
> 0) ? j
- 1 : 0);
920 js
.j_lastj
= (j
> 0) ? j
- 1 : 0;
922 js
.j_jobslots
= nsize
;
924 /* Zero out remaining slots in new jobs list */
925 for ( ; j
< nsize
; j
++)
926 nlist
[j
] = (JOB
*)NULL
;
937 js
.j_previous
= nprev
;
939 /* Need to reset these */
940 if (js
.j_current
== NO_JOB
|| js
.j_previous
== NO_JOB
|| js
.j_current
> js
.j_lastj
|| js
.j_previous
> js
.j_lastj
)
944 itrace ("realloc_jobs_list: reset js.j_current (%d) and js.j_previous (%d)", js
.j_current
, js
.j_previous
);
947 UNBLOCK_CHILD (oset
);
950 /* Compact the jobs list by removing dead jobs. Assumed that we have filled
951 the jobs array to some predefined maximum. Called when the shell is not
952 the foreground process (subshell_environment != 0). Returns the first
953 available slot in the compacted list. If that value is js.j_jobslots, then
954 the list needs to be reallocated. The jobs array may be in new memory if
955 this returns > 0 and < js.j_jobslots. FLAGS is reserved for future use. */
957 compact_jobs_list (flags
)
960 if (js
.j_jobslots
== 0 || jobs_list_frozen
)
961 return js
.j_jobslots
;
964 realloc_jobs_list ();
969 /* Delete the job at INDEX from the job list. Must be called
970 with SIGCHLD blocked. */
972 delete_job (job_index
, dflags
)
973 int job_index
, dflags
;
980 if (js
.j_jobslots
== 0 || jobs_list_frozen
)
983 if ((dflags
& DEL_WARNSTOPPED
) && subshell_environment
== 0 && STOPPED (job_index
))
984 internal_warning (_("deleting stopped job %d with process group %ld"), job_index
+1, (long)jobs
[job_index
]->pgrp
);
985 temp
= jobs
[job_index
];
988 if (job_index
== js
.j_current
|| job_index
== js
.j_previous
)
991 if ((dflags
& DEL_NOBGPID
) == 0)
993 proc
= find_last_proc (job_index
, 0);
994 /* Could do this just for J_ASYNC jobs, but we save all. */
996 bgp_add (proc
->pid
, process_exit_status (proc
->status
));
999 jobs
[job_index
] = (JOB
*)NULL
;
1000 if (temp
== js
.j_lastmade
)
1002 else if (temp
== js
.j_lastasync
)
1006 ndel
= discard_pipeline (temp
->pipe
);
1008 js
.c_injobs
-= ndel
;
1009 if (temp
->state
== JDEAD
)
1011 js
.c_reaped
-= ndel
;
1013 if (js
.c_reaped
< 0)
1016 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
);
1023 dispose_command (temp
->deferred
);
1028 if (js
.j_njobs
== 0)
1029 js
.j_firstj
= js
.j_lastj
= 0;
1030 else if (jobs
[js
.j_firstj
] == 0 || jobs
[js
.j_lastj
] == 0)
1031 reset_job_indices ();
1034 /* Must be called with SIGCHLD blocked. */
1036 nohup_job (job_index
)
1041 if (js
.j_jobslots
== 0)
1044 if (temp
= jobs
[job_index
])
1045 temp
->flags
|= J_NOHUP
;
1048 /* Get rid of the data structure associated with a process chain. */
1050 discard_pipeline (chain
)
1051 register PROCESS
*chain
;
1053 register PROCESS
*this, *next
;
1061 FREE (this->command
);
1066 while (this != chain
);
1071 /* Add this process to the chain being built in the_pipeline.
1072 NAME is the command string that will be exec'ed later.
1073 PID is the process id of the child. */
1075 add_process (name
, pid
)
1081 #if defined (RECYCLES_PIDS)
1083 p
= find_process (pid
, 0, &j
);
1088 internal_warning ("add_process: process %5ld (%s) in the_pipeline", (long)p
->pid
, p
->command
);
1091 internal_warning ("add_process: pid %5ld (%s) marked as still alive", (long)p
->pid
, p
->command
);
1092 p
->running
= PS_RECYCLED
; /* mark as recycled */
1096 t
= (PROCESS
*)xmalloc (sizeof (PROCESS
));
1097 t
->next
= the_pipeline
;
1099 WSTATUS (t
->status
) = 0;
1100 t
->running
= PS_RUNNING
;
1109 while (p
->next
!= t
->next
)
1116 /* Take the last job and make it the first job. Must be called with
1119 rotate_the_pipeline ()
1123 if (the_pipeline
->next
== the_pipeline
)
1125 for (p
= the_pipeline
; p
->next
!= the_pipeline
; p
= p
->next
)
1130 /* Reverse the order of the processes in the_pipeline. Must be called with
1133 reverse_the_pipeline ()
1137 if (the_pipeline
->next
== the_pipeline
)
1140 for (p
= the_pipeline
; p
->next
!= the_pipeline
; p
= p
->next
)
1142 p
->next
= (PROCESS
*)NULL
;
1144 n
= REVERSE_LIST (the_pipeline
, PROCESS
*);
1147 for (p
= the_pipeline
; p
->next
; p
= p
->next
)
1149 p
->next
= the_pipeline
;
1153 /* Map FUNC over the list of jobs. If FUNC returns non-zero,
1154 then it is time to stop mapping, and that is the return value
1155 for map_over_jobs. FUNC is called with a JOB, arg1, arg2,
1158 map_over_jobs (func
, arg1
, arg2
)
1159 sh_job_map_func_t
*func
;
1166 if (js
.j_jobslots
== 0)
1169 BLOCK_CHILD (set
, oset
);
1171 /* XXX could use js.j_firstj here */
1172 for (i
= result
= 0; i
< js
.j_jobslots
; i
++)
1175 if (i
< js
.j_firstj
&& jobs
[i
])
1176 itrace("map_over_jobs: job %d non-null before js.j_firstj (%d)", i
, js
.j_firstj
);
1177 if (i
> js
.j_lastj
&& jobs
[i
])
1178 itrace("map_over_jobs: job %d non-null after js.j_lastj (%d)", i
, js
.j_lastj
);
1182 result
= (*func
)(jobs
[i
], arg1
, arg2
, i
);
1188 UNBLOCK_CHILD (oset
);
1193 /* Cause all the jobs in the current pipeline to exit. */
1195 terminate_current_pipeline ()
1197 if (pipeline_pgrp
&& pipeline_pgrp
!= shell_pgrp
)
1199 killpg (pipeline_pgrp
, SIGTERM
);
1200 killpg (pipeline_pgrp
, SIGCONT
);
1204 /* Cause all stopped jobs to exit. */
1206 terminate_stopped_jobs ()
1210 /* XXX could use js.j_firstj here */
1211 for (i
= 0; i
< js
.j_jobslots
; i
++)
1213 if (jobs
[i
] && STOPPED (i
))
1215 killpg (jobs
[i
]->pgrp
, SIGTERM
);
1216 killpg (jobs
[i
]->pgrp
, SIGCONT
);
1221 /* Cause all jobs, running or stopped, to receive a hangup signal. If
1222 a job is marked J_NOHUP, don't send the SIGHUP. */
1228 /* XXX could use js.j_firstj here */
1229 for (i
= 0; i
< js
.j_jobslots
; i
++)
1233 if (jobs
[i
]->flags
& J_NOHUP
)
1235 killpg (jobs
[i
]->pgrp
, SIGHUP
);
1237 killpg (jobs
[i
]->pgrp
, SIGCONT
);
1243 kill_current_pipeline ()
1245 stop_making_children ();
1249 /* Return the pipeline that PID belongs to. Note that the pipeline
1250 doesn't have to belong to a job. Must be called with SIGCHLD blocked.
1251 If JOBP is non-null, return the index of the job containing PID. */
1253 find_pipeline (pid
, alive_only
, jobp
)
1256 int *jobp
; /* index into jobs list or NO_JOB */
1261 /* See if this process is in the pipeline that we are building. */
1269 /* Return it if we found it. Don't ever return a recycled pid. */
1270 if (p
->pid
== pid
&& ((alive_only
== 0 && PRECYCLED(p
) == 0) || PALIVE(p
)))
1275 while (p
!= the_pipeline
);
1278 job
= find_job (pid
, alive_only
, &p
);
1281 return (job
== NO_JOB
) ? (PROCESS
*)NULL
: jobs
[job
]->pipe
;
1284 /* Return the PROCESS * describing PID. If JOBP is non-null return the index
1285 into the jobs array of the job containing PID. Must be called with
1288 find_process (pid
, alive_only
, jobp
)
1291 int *jobp
; /* index into jobs list or NO_JOB */
1295 p
= find_pipeline (pid
, alive_only
, jobp
);
1296 while (p
&& p
->pid
!= pid
)
1301 /* Return the job index that PID belongs to, or NO_JOB if it doesn't
1302 belong to any job. Must be called with SIGCHLD blocked. */
1304 find_job (pid
, alive_only
, procp
)
1312 /* XXX could use js.j_firstj here, and should check js.j_lastj */
1313 for (i
= 0; i
< js
.j_jobslots
; i
++)
1316 if (i
< js
.j_firstj
&& jobs
[i
])
1317 itrace("find_job: job %d non-null before js.j_firstj (%d)", i
, js
.j_firstj
);
1318 if (i
> js
.j_lastj
&& jobs
[i
])
1319 itrace("find_job: job %d non-null after js.j_lastj (%d)", i
, js
.j_lastj
);
1327 if (p
->pid
== pid
&& ((alive_only
== 0 && PRECYCLED(p
) == 0) || PALIVE(p
)))
1336 while (p
!= jobs
[i
]->pipe
);
1343 /* Find a job given a PID. If BLOCK is non-zero, block SIGCHLD as
1344 required by find_job. */
1346 get_job_by_pid (pid
, block
)
1354 BLOCK_CHILD (set
, oset
);
1356 job
= find_job (pid
, 0, NULL
);
1359 UNBLOCK_CHILD (oset
);
1364 /* Print descriptive information about the job with leader pid PID. */
1372 BLOCK_CHILD (set
, oset
);
1374 job
= find_job (pid
, 0, NULL
);
1377 fprintf (stderr
, "[%d] %ld\n", job
+ 1, (long)pid
);
1379 programming_error (_("describe_pid: %ld: no such pid"), (long)pid
);
1381 UNBLOCK_CHILD (oset
);
1393 x
= retcode_name_buffer
;
1394 sprintf (x
, "Signal %d", s
);
1400 printable_job_status (j
, p
, format
)
1410 if (STOPPED (j
) && format
== 0)
1412 if (posixly_correct
== 0 || p
== 0 || (WIFSTOPPED (p
->status
) == 0))
1416 temp
= retcode_name_buffer
;
1417 sprintf (temp
, "Stopped(%s)", signal_name (WSTOPSIG (p
->status
)));
1420 else if (RUNNING (j
))
1424 if (WIFSTOPPED (p
->status
))
1425 temp
= j_strsignal (WSTOPSIG (p
->status
));
1426 else if (WIFSIGNALED (p
->status
))
1427 temp
= j_strsignal (WTERMSIG (p
->status
));
1428 else if (WIFEXITED (p
->status
))
1430 temp
= retcode_name_buffer
;
1431 es
= WEXITSTATUS (p
->status
);
1433 strcpy (temp
, "Done");
1434 else if (posixly_correct
)
1435 sprintf (temp
, "Done(%d)", es
);
1437 sprintf (temp
, "Exit %d", es
);
1440 temp
= "Unknown status";
1446 /* This is the way to print out information on a job if you
1447 know the index. FORMAT is:
1449 JLIST_NORMAL) [1]+ Running emacs
1450 JLIST_LONG ) [1]+ 2378 Running emacs
1451 -1 ) [1]+ 2378 emacs
1453 JLIST_NORMAL) [1]+ Stopped ls | more
1454 JLIST_LONG ) [1]+ 2369 Stopped ls
1457 Just list the pid of the process group leader (really
1460 Use format JLIST_NORMAL, but list only jobs about which
1461 the user has not been notified. */
1463 /* Print status for pipeline P. If JOB_INDEX is >= 0, it is the index into
1464 the JOBS array corresponding to this pipeline. FORMAT is as described
1465 above. Must be called with SIGCHLD blocked.
1467 If you're printing a pipeline that's not in the jobs array, like the
1468 current pipeline as it's being created, pass -1 for JOB_INDEX */
1470 print_pipeline (p
, job_index
, format
, stream
)
1472 int job_index
, format
;
1475 PROCESS
*first
, *last
, *show
;
1476 int es
, name_padding
;
1483 while (last
->next
!= first
)
1489 fprintf (stream
, format
? " " : " |");
1491 if (format
!= JLIST_STANDARD
)
1492 fprintf (stream
, "%5ld", (long)p
->pid
);
1494 fprintf (stream
, " ");
1496 if (format
> -1 && job_index
>= 0)
1498 show
= format
? p
: last
;
1499 temp
= printable_job_status (job_index
, show
, format
);
1505 if (show
->running
== first
->running
&&
1506 WSTATUS (show
->status
) == WSTATUS (first
->status
))
1510 temp
= (char *)NULL
;
1515 fprintf (stream
, "%s", temp
);
1519 es
= 2; /* strlen ("| ") */
1520 name_padding
= LONGEST_SIGNAL_DESC
- es
;
1522 fprintf (stream
, "%*s", name_padding
, "");
1524 if ((WIFSTOPPED (show
->status
) == 0) &&
1525 (WIFCONTINUED (show
->status
) == 0) &&
1526 WIFCORED (show
->status
))
1527 fprintf (stream
, "(core dumped) ");
1531 if (p
!= first
&& format
)
1532 fprintf (stream
, "| ");
1535 fprintf (stream
, "%s", p
->command
);
1537 if (p
== last
&& job_index
>= 0)
1539 temp
= current_working_directory ();
1541 if (RUNNING (job_index
) && (IS_FOREGROUND (job_index
) == 0))
1542 fprintf (stream
, " &");
1544 if (strcmp (temp
, jobs
[job_index
]->wd
) != 0)
1546 " (wd: %s)", polite_directory_format (jobs
[job_index
]->wd
));
1549 if (format
|| (p
== last
))
1551 /* We need to add a CR only if this is an interactive shell, and
1552 we're reporting the status of a completed job asynchronously.
1553 We can't really check whether this particular job is being
1554 reported asynchronously, so just add the CR if the shell is
1555 currently interactive and asynchronous notification is enabled. */
1556 if (asynchronous_notification
&& interactive
)
1557 fprintf (stream
, "\r\n");
1559 fprintf (stream
, "\n");
1569 /* Print information to STREAM about jobs[JOB_INDEX] according to FORMAT.
1570 Must be called with SIGCHLD blocked or queued with queue_sigchld */
1572 pretty_print_job (job_index
, format
, stream
)
1573 int job_index
, format
;
1576 register PROCESS
*p
;
1578 /* Format only pid information about the process group leader? */
1579 if (format
== JLIST_PID_ONLY
)
1581 fprintf (stream
, "%ld\n", (long)jobs
[job_index
]->pipe
->pid
);
1585 if (format
== JLIST_CHANGED_ONLY
)
1587 if (IS_NOTIFIED (job_index
))
1589 format
= JLIST_STANDARD
;
1592 if (format
!= JLIST_NONINTERACTIVE
)
1593 fprintf (stream
, "[%d]%c ", job_index
+ 1,
1594 (job_index
== js
.j_current
) ? '+':
1595 (job_index
== js
.j_previous
) ? '-' : ' ');
1597 if (format
== JLIST_NONINTERACTIVE
)
1598 format
= JLIST_LONG
;
1600 p
= jobs
[job_index
]->pipe
;
1602 print_pipeline (p
, job_index
, format
, stream
);
1604 /* We have printed information about this job. When the job's
1605 status changes, waitchld () sets the notification flag to 0. */
1606 jobs
[job_index
]->flags
|= J_NOTIFIED
;
1610 print_job (job
, format
, state
, job_index
)
1612 int format
, state
, job_index
;
1614 if (state
== -1 || (JOB_STATE
)state
== job
->state
)
1615 pretty_print_job (job_index
, format
, stdout
);
1620 list_one_job (job
, format
, ignore
, job_index
)
1622 int format
, ignore
, job_index
;
1624 pretty_print_job (job_index
, format
, stdout
);
1628 list_stopped_jobs (format
)
1631 cleanup_dead_jobs ();
1632 map_over_jobs (print_job
, format
, (int)JSTOPPED
);
1636 list_running_jobs (format
)
1639 cleanup_dead_jobs ();
1640 map_over_jobs (print_job
, format
, (int)JRUNNING
);
1643 /* List jobs. If FORMAT is non-zero, then the long form of the information
1644 is printed, else just a short version. */
1646 list_all_jobs (format
)
1649 cleanup_dead_jobs ();
1650 map_over_jobs (print_job
, format
, -1);
1653 /* Fork, handling errors. Returns the pid of the newly made child, or 0.
1654 COMMAND is just for remembering the name of the command; we don't do
1655 anything else with it. ASYNC_P says what to do with the tty. If
1656 non-zero, then don't give it away. */
1658 make_child (command
, async_p
)
1666 sigaddset (&set
, SIGCHLD
);
1667 sigaddset (&set
, SIGINT
);
1668 sigemptyset (&oset
);
1669 sigprocmask (SIG_BLOCK
, &set
, &oset
);
1673 #if defined (BUFFERED_INPUT)
1674 /* If default_buffered_input is active, we are reading a script. If
1675 the command is asynchronous, we have already duplicated /dev/null
1676 as fd 0, but have not changed the buffered stream corresponding to
1677 the old fd 0. We don't want to sync the stream in this case. */
1678 if (default_buffered_input
!= -1 &&
1679 (!async_p
|| default_buffered_input
> 0))
1680 sync_buffered_stream (default_buffered_input
);
1681 #endif /* BUFFERED_INPUT */
1683 /* Create the child, handle severe errors. */
1684 if ((pid
= fork ()) < 0)
1688 /* Kill all of the processes in the current pipeline. */
1689 terminate_current_pipeline ();
1691 /* Discard the current pipeline, if any. */
1693 kill_current_pipeline ();
1695 throw_to_top_level (); /* Reset signals, etc. */
1700 /* In the child. Give this child the right process group, set the
1701 signals to the default state for a new process. */
1705 #if defined (BUFFERED_INPUT)
1706 /* Close default_buffered_input if it's > 0. We don't close it if it's
1707 0 because that's the file descriptor used when redirecting input,
1708 and it's wrong to close the file in that case. */
1709 unset_bash_input (0);
1710 #endif /* BUFFERED_INPUT */
1712 /* Restore top-level signal mask. */
1713 sigprocmask (SIG_SETMASK
, &top_level_mask
, (sigset_t
*)NULL
);
1717 /* All processes in this pipeline belong in the same
1720 if (pipeline_pgrp
== 0) /* This is the first child. */
1721 pipeline_pgrp
= mypid
;
1723 /* Check for running command in backquotes. */
1724 if (pipeline_pgrp
== shell_pgrp
)
1725 ignore_tty_job_signals ();
1727 default_tty_job_signals ();
1729 /* Set the process group before trying to mess with the terminal's
1730 process group. This is mandated by POSIX. */
1731 /* This is in accordance with the Posix 1003.1 standard,
1732 section B.7.2.4, which says that trying to set the terminal
1733 process group with tcsetpgrp() to an unused pgrp value (like
1734 this would have for the first child) is an error. Section
1735 B.4.3.3, p. 237 also covers this, in the context of job control
1737 if (setpgid (mypid
, pipeline_pgrp
) < 0)
1738 sys_error ("child setpgid (%ld to %ld)", (long)mypid
, (long)pipeline_pgrp
);
1740 /* By convention (and assumption above), if
1741 pipeline_pgrp == shell_pgrp, we are making a child for
1742 command substitution.
1743 In this case, we don't want to give the terminal to the
1744 shell's process group (we could be in the middle of a
1745 pipeline, for example). */
1746 if (async_p
== 0 && pipeline_pgrp
!= shell_pgrp
&& ((subshell_environment
&SUBSHELL_ASYNC
) == 0))
1747 give_terminal_to (pipeline_pgrp
, 0);
1749 #if defined (PGRP_PIPE)
1750 if (pipeline_pgrp
== mypid
)
1751 pipe_read (pgrp_pipe
);
1754 else /* Without job control... */
1756 if (pipeline_pgrp
== 0)
1757 pipeline_pgrp
= shell_pgrp
;
1759 /* If these signals are set to SIG_DFL, we encounter the curious
1760 situation of an interactive ^Z to a running process *working*
1761 and stopping the process, but being unable to do anything with
1762 that process to change its state. On the other hand, if they
1763 are set to SIG_IGN, jobs started from scripts do not stop when
1764 the shell running the script gets a SIGTSTP and stops. */
1766 default_tty_job_signals ();
1769 #if defined (PGRP_PIPE)
1770 /* Release the process group pipe, since our call to setpgid ()
1771 is done. The last call to pipe_close is done in stop_pipeline. */
1772 pipe_close (pgrp_pipe
);
1773 #endif /* PGRP_PIPE */
1776 last_asynchronous_pid
= mypid
;
1777 #if defined (RECYCLES_PIDS)
1778 else if (last_asynchronous_pid
== mypid
)
1779 /* Avoid pid aliasing. 1 seems like a safe, unusual pid value. */
1780 last_asynchronous_pid
= 1;
1785 /* In the parent. Remember the pid of the child just created
1786 as the proper pgrp if this is the first child. */
1788 if (first_pid
== NO_PID
)
1790 else if (pid_wrap
== -1 && pid
< first_pid
)
1792 else if (pid_wrap
== 0 && pid
>= first_pid
)
1797 if (pipeline_pgrp
== 0)
1799 pipeline_pgrp
= pid
;
1800 /* Don't twiddle terminal pgrps in the parent! This is the bug,
1801 not the good thing of twiddling them in the child! */
1802 /* give_terminal_to (pipeline_pgrp, 0); */
1804 /* This is done on the recommendation of the Rationale section of
1805 the POSIX 1003.1 standard, where it discusses job control and
1806 shells. It is done to avoid possible race conditions. (Ref.
1807 1003.1 Rationale, section B.4.3.3, page 236). */
1808 setpgid (pid
, pipeline_pgrp
);
1812 if (pipeline_pgrp
== 0)
1813 pipeline_pgrp
= shell_pgrp
;
1816 /* Place all processes into the jobs array regardless of the
1817 state of job_control. */
1818 add_process (command
, pid
);
1821 last_asynchronous_pid
= pid
;
1822 #if defined (RECYCLES_PIDS)
1823 else if (last_asynchronous_pid
== pid
)
1824 /* Avoid pid aliasing. 1 seems like a safe, unusual pid value. */
1825 last_asynchronous_pid
= 1;
1829 delete_old_job (pid
);
1831 #if !defined (RECYCLES_PIDS)
1832 /* Only check for saved status if we've saved more than CHILD_MAX
1833 statuses, unless the system recycles pids. */
1834 if ((js
.c_reaped
+ bgpids
.npid
) >= js
.c_childmax
)
1836 bgp_delete (pid
); /* new process, discard any saved status */
1838 last_made_pid
= pid
;
1844 /* Unblock SIGINT and SIGCHLD unless creating a pipeline, in which case
1845 SIGCHLD remains blocked until all commands in the pipeline have been
1847 sigprocmask (SIG_SETMASK
, &oset
, (sigset_t
*)NULL
);
1853 /* These two functions are called only in child processes. */
1855 ignore_tty_job_signals ()
1857 set_signal_handler (SIGTSTP
, SIG_IGN
);
1858 set_signal_handler (SIGTTIN
, SIG_IGN
);
1859 set_signal_handler (SIGTTOU
, SIG_IGN
);
1863 default_tty_job_signals ()
1865 set_signal_handler (SIGTSTP
, SIG_DFL
);
1866 set_signal_handler (SIGTTIN
, SIG_DFL
);
1867 set_signal_handler (SIGTTOU
, SIG_DFL
);
1870 /* When we end a job abnormally, or if we stop a job, we set the tty to the
1871 state kept in here. When a job ends normally, we set the state in here
1872 to the state of the tty. */
1874 static TTYSTRUCT shell_tty_info
;
1876 #if defined (NEW_TTY_DRIVER)
1877 static struct tchars shell_tchars
;
1878 static struct ltchars shell_ltchars
;
1879 #endif /* NEW_TTY_DRIVER */
1881 #if defined (NEW_TTY_DRIVER) && defined (DRAIN_OUTPUT)
1882 /* Since the BSD tty driver does not allow us to change the tty modes
1883 while simultaneously waiting for output to drain and preserving
1884 typeahead, we have to drain the output ourselves before calling
1885 ioctl. We cheat by finding the length of the output queue, and
1886 using select to wait for an appropriate length of time. This is
1887 a hack, and should be labeled as such (it's a hastily-adapted
1888 mutation of a `usleep' implementation). It's only reason for
1889 existing is the flaw in the BSD tty driver. */
1891 static int ttspeeds
[] =
1893 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200,
1894 1800, 2400, 4800, 9600, 19200, 38400
1901 register int delay
= ttspeeds
[ospeed
];
1907 while ((ioctl (fd
, TIOCOUTQ
, &n
) == 0) && n
)
1909 if (n
> (delay
/ 100))
1913 n
*= 10; /* 2 bits more for conservativeness. */
1914 tv
.tv_sec
= n
/ delay
;
1915 tv
.tv_usec
= ((n
% delay
) * 1000000) / delay
;
1916 select (fd
, (fd_set
*)0, (fd_set
*)0, (fd_set
*)0, &tv
);
1922 #endif /* NEW_TTY_DRIVER && DRAIN_OUTPUT */
1924 /* Return the fd from which we are actually getting input. */
1925 #define input_tty() (shell_tty != -1) ? shell_tty : fileno (stderr)
1927 /* Fill the contents of shell_tty_info with the current tty info. */
1936 #if defined (NEW_TTY_DRIVER)
1937 ioctl (tty
, TIOCGETP
, &shell_tty_info
);
1938 ioctl (tty
, TIOCGETC
, &shell_tchars
);
1939 ioctl (tty
, TIOCGLTC
, &shell_ltchars
);
1940 #endif /* NEW_TTY_DRIVER */
1942 #if defined (TERMIO_TTY_DRIVER)
1943 ioctl (tty
, TCGETA
, &shell_tty_info
);
1944 #endif /* TERMIO_TTY_DRIVER */
1946 #if defined (TERMIOS_TTY_DRIVER)
1947 if (tcgetattr (tty
, &shell_tty_info
) < 0)
1950 /* Only print an error message if we're really interactive at
1953 sys_error ("[%ld: %d] tcgetattr", (long)getpid (), shell_level
);
1957 #endif /* TERMIOS_TTY_DRIVER */
1958 if (check_window_size
)
1959 get_new_window_size (0, (int *)0, (int *)0);
1964 /* Make the current tty use the state in shell_tty_info. */
1973 #if defined (NEW_TTY_DRIVER)
1974 # if defined (DRAIN_OUTPUT)
1975 draino (tty
, shell_tty_info
.sg_ospeed
);
1976 # endif /* DRAIN_OUTPUT */
1977 ioctl (tty
, TIOCSETN
, &shell_tty_info
);
1978 ioctl (tty
, TIOCSETC
, &shell_tchars
);
1979 ioctl (tty
, TIOCSLTC
, &shell_ltchars
);
1980 #endif /* NEW_TTY_DRIVER */
1982 #if defined (TERMIO_TTY_DRIVER)
1983 ioctl (tty
, TCSETAW
, &shell_tty_info
);
1984 #endif /* TERMIO_TTY_DRIVER */
1986 #if defined (TERMIOS_TTY_DRIVER)
1987 if (tcsetattr (tty
, TCSADRAIN
, &shell_tty_info
) < 0)
1989 /* Only print an error message if we're really interactive at
1992 sys_error ("[%ld: %d] tcsetattr", (long)getpid (), shell_level
);
1995 #endif /* TERMIOS_TTY_DRIVER */
2000 /* Given an index into the jobs array JOB, return the PROCESS struct of the last
2001 process in that job's pipeline. This is the one whose exit status
2002 counts. Must be called with SIGCHLD blocked or queued. */
2004 find_last_proc (job
, block
)
2008 register PROCESS
*p
;
2012 BLOCK_CHILD (set
, oset
);
2014 p
= jobs
[job
]->pipe
;
2015 while (p
&& p
->next
!= jobs
[job
]->pipe
)
2019 UNBLOCK_CHILD (oset
);
2025 find_last_pid (job
, block
)
2031 p
= find_last_proc (job
, block
);
2032 /* Possible race condition here. */
2036 /* Wait for a particular child of the shell to finish executing.
2037 This low-level function prints an error message if PID is not
2038 a child of this shell. It returns -1 if it fails, or whatever
2039 wait_for returns otherwise. If the child is not found in the
2040 jobs table, it returns 127. */
2042 wait_for_single_pid (pid
)
2045 register PROCESS
*child
;
2049 BLOCK_CHILD (set
, oset
);
2050 child
= find_pipeline (pid
, 0, (int *)NULL
);
2051 UNBLOCK_CHILD (oset
);
2055 r
= bgp_search (pid
);
2062 internal_error (_("wait: pid %ld is not a child of this shell"), (long)pid
);
2068 /* POSIX.2: if we just waited for a job, we can remove it from the jobs
2070 BLOCK_CHILD (set
, oset
);
2071 job
= find_job (pid
, 0, NULL
);
2072 if (job
!= NO_JOB
&& jobs
[job
] && DEADJOB (job
))
2073 jobs
[job
]->flags
|= J_NOTIFIED
;
2074 UNBLOCK_CHILD (oset
);
2076 /* If running in posix mode, remove the job from the jobs table immediately */
2077 if (posixly_correct
)
2079 cleanup_dead_jobs ();
2086 /* Wait for all of the backgrounds of this shell to finish. */
2088 wait_for_background_pids ()
2090 register int i
, r
, waited_for
;
2094 for (waited_for
= 0;;)
2096 BLOCK_CHILD (set
, oset
);
2098 /* find first running job; if none running in foreground, break */
2099 /* XXX could use js.j_firstj and js.j_lastj here */
2100 for (i
= 0; i
< js
.j_jobslots
; i
++)
2103 if (i
< js
.j_firstj
&& jobs
[i
])
2104 itrace("wait_for_background_pids: job %d non-null before js.j_firstj (%d)", i
, js
.j_firstj
);
2105 if (i
> js
.j_lastj
&& jobs
[i
])
2106 itrace("wait_for_background_pids: job %d non-null after js.j_lastj (%d)", i
, js
.j_lastj
);
2108 if (jobs
[i
] && RUNNING (i
) && IS_FOREGROUND (i
) == 0)
2111 if (i
== js
.j_jobslots
)
2113 UNBLOCK_CHILD (oset
);
2117 /* now wait for the last pid in that job. */
2118 pid
= find_last_pid (i
, 0);
2119 UNBLOCK_CHILD (oset
);
2121 errno
= 0; /* XXX */
2122 r
= wait_for_single_pid (pid
);
2125 /* If we're mistaken about job state, compensate. */
2126 if (errno
== ECHILD
)
2127 mark_all_jobs_as_dead ();
2133 /* POSIX.2 says the shell can discard the statuses of all completed jobs if
2134 `wait' is called with no arguments. */
2135 mark_dead_jobs_as_notified (1);
2136 cleanup_dead_jobs ();
2140 /* Make OLD_SIGINT_HANDLER the SIGINT signal handler. */
2141 #define INVALID_SIGNAL_HANDLER (SigHandler *)wait_for_background_pids
2142 static SigHandler
*old_sigint_handler
= INVALID_SIGNAL_HANDLER
;
2145 restore_sigint_handler ()
2147 if (old_sigint_handler
!= INVALID_SIGNAL_HANDLER
)
2149 set_signal_handler (SIGINT
, old_sigint_handler
);
2150 old_sigint_handler
= INVALID_SIGNAL_HANDLER
;
2154 static int wait_sigint_received
;
2156 /* Handle SIGINT while we are waiting for children in a script to exit.
2157 The `wait' builtin should be interruptible, but all others should be
2158 effectively ignored (i.e. not cause the shell to exit). */
2160 wait_sigint_handler (sig
)
2163 SigHandler
*sigint_handler
;
2165 if (interrupt_immediately
||
2166 (this_shell_builtin
&& this_shell_builtin
== wait_builtin
))
2168 last_command_exit_value
= EXECUTION_FAILURE
;
2169 restore_sigint_handler ();
2170 /* If we got a SIGINT while in `wait', and SIGINT is trapped, do
2171 what POSIX.2 says (see builtins/wait.def for more info). */
2172 if (this_shell_builtin
&& this_shell_builtin
== wait_builtin
&&
2173 signal_is_trapped (SIGINT
) &&
2174 ((sigint_handler
= trap_to_sighandler (SIGINT
)) == trap_handler
))
2176 interrupt_immediately
= 0;
2177 trap_handler (SIGINT
); /* set pending_traps[SIGINT] */
2178 wait_signal_received
= SIGINT
;
2179 longjmp (wait_intr_buf
, 1);
2186 /* XXX - should this be interrupt_state? If it is, the shell will act
2187 as if it got the SIGINT interrupt. */
2188 wait_sigint_received
= 1;
2190 /* Otherwise effectively ignore the SIGINT and allow the running job to
2196 process_exit_signal (status
)
2199 return (WIFSIGNALED (status
) ? WTERMSIG (status
) : 0);
2203 process_exit_status (status
)
2206 if (WIFSIGNALED (status
))
2207 return (128 + WTERMSIG (status
));
2208 else if (WIFSTOPPED (status
) == 0)
2209 return (WEXITSTATUS (status
));
2211 return (EXECUTION_SUCCESS
);
2214 /* Return the exit status of the last process in the pipeline for job JOB.
2215 This is the exit status of the entire job. */
2217 raw_job_exit_status (job
)
2220 register PROCESS
*p
;
2226 p
= jobs
[job
]->pipe
;
2229 if (p
->status
!= EXECUTION_SUCCESS
) fail
= p
->status
;
2232 while (p
!= jobs
[job
]->pipe
);
2236 for (p
= jobs
[job
]->pipe
; p
->next
!= jobs
[job
]->pipe
; p
= p
->next
)
2241 /* Return the exit status of job JOB. This is the exit status of the last
2242 (rightmost) process in the job's pipeline, modified if the job was killed
2243 by a signal or stopped. */
2245 job_exit_status (job
)
2248 return (process_exit_status (raw_job_exit_status (job
)));
2252 job_exit_signal (job
)
2255 return (process_exit_signal (raw_job_exit_status (job
)));
2258 #define FIND_CHILD(pid, child) \
2261 child = find_pipeline (pid, 0, (int *)NULL); \
2264 give_terminal_to (shell_pgrp, 0); \
2265 UNBLOCK_CHILD (oset); \
2266 internal_error (_("wait_for: No record of process %ld"), (long)pid); \
2267 restore_sigint_handler (); \
2268 return (termination_state = 127); \
2273 /* Wait for pid (one of our children) to terminate, then
2274 return the termination state. Returns 127 if PID is not found in
2275 the jobs table. Returns -1 if waitchld() returns -1, indicating
2276 that there are no unwaited-for child processes. */
2281 int job
, termination_state
, r
;
2283 register PROCESS
*child
;
2285 register PROCESS
*p
;
2287 /* In the case that this code is interrupted, and we longjmp () out of it,
2288 we are relying on the code in throw_to_top_level () to restore the
2289 top-level signal mask. */
2290 BLOCK_CHILD (set
, oset
);
2292 /* Ignore interrupts while waiting for a job run without job control
2293 to finish. We don't want the shell to exit if an interrupt is
2294 received, only if one of the jobs run is killed via SIGINT. If
2295 job control is not set, the job will be run in the same pgrp as
2296 the shell, and the shell will see any signals the job gets. */
2298 /* This is possibly a race condition -- should it go in stop_pipeline? */
2299 wait_sigint_received
= 0;
2300 if (job_control
== 0)
2302 old_sigint_handler
= set_signal_handler (SIGINT
, wait_sigint_handler
);
2303 if (old_sigint_handler
== SIG_IGN
)
2304 set_signal_handler (SIGINT
, old_sigint_handler
);
2307 termination_state
= last_command_exit_value
;
2309 if (interactive
&& job_control
== 0)
2312 /* If we say wait_for (), then we have a record of this child somewhere.
2313 If it and none of its peers are running, don't call waitchld(). */
2318 FIND_CHILD (pid
, child
);
2320 /* If this child is part of a job, then we are really waiting for the
2321 job to finish. Otherwise, we are waiting for the child to finish.
2322 We check for JDEAD in case the job state has been set by waitchld
2323 after receipt of a SIGCHLD. */
2325 job
= find_job (pid
, 0, NULL
);
2327 /* waitchld() takes care of setting the state of the job. If the job
2328 has already exited before this is called, sigchld_handler will have
2329 called waitchld and the state will be set to JDEAD. */
2331 if (PRUNNING(child
) || (job
!= NO_JOB
&& RUNNING (job
)))
2333 #if defined (WAITPID_BROKEN) /* SCOv4 */
2334 sigset_t suspend_set
;
2335 sigemptyset (&suspend_set
);
2336 sigsuspend (&suspend_set
);
2337 #else /* !WAITPID_BROKEN */
2338 # if defined (MUST_UNBLOCK_CHLD)
2339 struct sigaction act
, oact
;
2340 sigset_t nullset
, chldset
;
2342 sigemptyset (&nullset
);
2343 sigemptyset (&chldset
);
2344 sigprocmask (SIG_SETMASK
, &nullset
, &chldset
);
2345 act
.sa_handler
= SIG_DFL
;
2346 sigemptyset (&act
.sa_mask
);
2347 sigemptyset (&oact
.sa_mask
);
2349 sigaction (SIGCHLD
, &act
, &oact
);
2352 r
= waitchld (pid
, 1);
2353 # if defined (MUST_UNBLOCK_CHLD)
2354 sigaction (SIGCHLD
, &oact
, (struct sigaction
*)NULL
);
2355 sigprocmask (SIG_SETMASK
, &chldset
, (sigset_t
*)NULL
);
2358 if (r
== -1 && errno
== ECHILD
&& this_shell_builtin
== wait_builtin
)
2360 termination_state
= -1;
2361 goto wait_for_return
;
2364 /* If child is marked as running, but waitpid() returns -1/ECHILD,
2365 there is something wrong. Somewhere, wait should have returned
2366 that child's pid. Mark the child as not running and the job,
2367 if it exists, as JDEAD. */
2368 if (r
== -1 && errno
== ECHILD
)
2370 child
->running
= PS_DONE
;
2371 child
->status
= 0; /* XXX -- can't find true status */
2372 js
.c_living
= 0; /* no living child processes */
2375 jobs
[job
]->state
= JDEAD
;
2380 #endif /* WAITPID_BROKEN */
2383 /* If the shell is interactive, and job control is disabled, see
2384 if the foreground process has died due to SIGINT and jump out
2385 of the wait loop if it has. waitchld has already restored the
2386 old SIGINT signal handler. */
2387 if (interactive
&& job_control
== 0)
2390 while (PRUNNING (child
) || (job
!= NO_JOB
&& RUNNING (job
)));
2392 /* The exit state of the command is either the termination state of the
2393 child, or the termination state of the job. If a job, the status
2394 of the last child in the pipeline is the significant one. If the command
2395 or job was terminated by a signal, note that value also. */
2396 termination_state
= (job
!= NO_JOB
) ? job_exit_status (job
)
2397 : process_exit_status (child
->status
);
2398 last_command_exit_signal
= (job
!= NO_JOB
) ? job_exit_signal (job
)
2399 : process_exit_signal (child
->status
);
2402 if ((job
!= NO_JOB
&& JOBSTATE (job
) == JSTOPPED
) || WIFSTOPPED (child
->status
))
2403 termination_state
= 128 + WSTOPSIG (child
->status
);
2405 if (job
== NO_JOB
|| IS_JOBCONTROL (job
))
2407 /* XXX - under what circumstances is a job not present in the jobs
2408 table (job == NO_JOB)?
2409 1. command substitution
2411 In the case of command substitution, at least, it's probably not
2412 the right thing to give the terminal to the shell's process group,
2413 even though there is code in subst.c:command_substitute to work
2417 $PROMPT_COMMAND execution
2418 process substitution
2422 itrace("wait_for: job == NO_JOB, giving the terminal to shell_pgrp (%ld)", (long)shell_pgrp
);
2424 give_terminal_to (shell_pgrp
, 0);
2427 /* If the command did not exit cleanly, or the job is just
2428 being stopped, then reset the tty state back to what it
2429 was before this command. Reset the tty state and notify
2430 the user of the job termination only if the shell is
2431 interactive. Clean up any dead jobs in either case. */
2434 if (interactive_shell
&& subshell_environment
== 0)
2436 /* This used to use `child->status'. That's wrong, however, for
2437 pipelines. `child' is the first process in the pipeline. It's
2438 likely that the process we want to check for abnormal termination
2439 or stopping is the last process in the pipeline, especially if
2440 it's long-lived and the first process is short-lived. Since we
2441 know we have a job here, we can check all the processes in this
2442 job's pipeline and see if one of them stopped or terminated due
2443 to a signal. We might want to change this later to just check
2444 the last process in the pipeline. If no process exits due to a
2445 signal, S is left as the status of the last job in the pipeline. */
2446 p
= jobs
[job
]->pipe
;
2450 if (WIFSIGNALED(s
) || WIFSTOPPED(s
))
2454 while (p
!= jobs
[job
]->pipe
);
2456 if (WIFSIGNALED (s
) || WIFSTOPPED (s
))
2460 /* If the current job was stopped or killed by a signal, and
2461 the user has requested it, get a possibly new window size */
2462 if (check_window_size
&& (job
== js
.j_current
|| IS_FOREGROUND (job
)))
2463 get_new_window_size (0, (int *)0, (int *)0);
2468 /* If job control is enabled, the job was started with job
2469 control, the job was the foreground job, and it was killed
2470 by SIGINT, then print a newline to compensate for the kernel
2471 printing the ^C without a trailing newline. */
2472 if (job_control
&& IS_JOBCONTROL (job
) && IS_FOREGROUND (job
) &&
2473 WIFSIGNALED (s
) && WTERMSIG (s
) == SIGINT
)
2475 /* If SIGINT is not trapped and the shell is in a for, while,
2476 or until loop, act as if the shell received SIGINT as
2477 well, so the loop can be broken. This doesn't call the
2478 SIGINT signal handler; maybe it should. */
2479 if (signal_is_trapped (SIGINT
) == 0 && loop_level
)
2489 /* Moved here from set_job_status_and_cleanup, which is in the SIGCHLD
2490 signal handler path */
2491 if (DEADJOB (job
) && IS_FOREGROUND (job
) /*&& subshell_environment == 0*/)
2494 /* If this job is dead, notify the user of the status. If the shell
2495 is interactive, this will display a message on the terminal. If
2496 the shell is not interactive, make sure we turn on the notify bit
2497 so we don't get an unwanted message about the job's termination,
2498 and so delete_job really clears the slot in the jobs table. */
2499 notify_and_cleanup ();
2504 UNBLOCK_CHILD (oset
);
2506 /* Restore the original SIGINT signal handler before we return. */
2507 restore_sigint_handler ();
2509 return (termination_state
);
2512 /* Wait for the last process in the pipeline for JOB. Returns whatever
2513 wait_for returns: the last process's termination state or -1 if there
2514 are no unwaited-for child processes or an error occurs. */
2523 BLOCK_CHILD(set
, oset
);
2524 if (JOBSTATE (job
) == JSTOPPED
)
2525 internal_warning (_("wait_for_job: job %d is stopped"), job
+1);
2527 pid
= find_last_pid (job
, 0);
2528 UNBLOCK_CHILD(oset
);
2531 /* POSIX.2: we can remove the job from the jobs table if we just waited
2533 BLOCK_CHILD (set
, oset
);
2534 if (job
!= NO_JOB
&& jobs
[job
] && DEADJOB (job
))
2535 jobs
[job
]->flags
|= J_NOTIFIED
;
2536 UNBLOCK_CHILD (oset
);
2541 /* Print info about dead jobs, and then delete them from the list
2542 of known jobs. This does not actually delete jobs when the
2543 shell is not interactive, because the dead jobs are not marked
2546 notify_and_cleanup ()
2548 if (jobs_list_frozen
)
2551 if (interactive
|| interactive_shell
== 0 || sourcelevel
)
2552 notify_of_job_status ();
2554 cleanup_dead_jobs ();
2557 /* Make dead jobs disappear from the jobs array without notification.
2558 This is used when the shell is not interactive. */
2562 mark_dead_jobs_as_notified (0);
2563 cleanup_dead_jobs ();
2566 /* Return the next closest (chronologically) job to JOB which is in
2567 STATE. STATE can be JSTOPPED, JRUNNING. NO_JOB is returned if
2568 there is no next recent job. */
2570 most_recent_job_in_state (job
, state
)
2574 register int i
, result
;
2577 BLOCK_CHILD (set
, oset
);
2579 for (result
= NO_JOB
, i
= job
- 1; i
>= 0; i
--)
2581 if (jobs
[i
] && (JOBSTATE (i
) == state
))
2588 UNBLOCK_CHILD (oset
);
2593 /* Return the newest *stopped* job older than JOB, or NO_JOB if not
2596 job_last_stopped (job
)
2599 return (most_recent_job_in_state (job
, JSTOPPED
));
2602 /* Return the newest *running* job older than JOB, or NO_JOB if not
2605 job_last_running (job
)
2608 return (most_recent_job_in_state (job
, JRUNNING
));
2611 /* Make JOB be the current job, and make previous be useful. Must be
2612 called with SIGCHLD blocked. */
2614 set_current_job (job
)
2619 if (js
.j_current
!= job
)
2621 js
.j_previous
= js
.j_current
;
2625 /* First choice for previous job is the old current job. */
2626 if (js
.j_previous
!= js
.j_current
&&
2627 js
.j_previous
!= NO_JOB
&&
2628 jobs
[js
.j_previous
] &&
2629 STOPPED (js
.j_previous
))
2632 /* Second choice: Newest stopped job that is older than
2635 if (STOPPED (js
.j_current
))
2637 candidate
= job_last_stopped (js
.j_current
);
2639 if (candidate
!= NO_JOB
)
2641 js
.j_previous
= candidate
;
2646 /* If we get here, there is either only one stopped job, in which case it is
2647 the current job and the previous job should be set to the newest running
2648 job, or there are only running jobs and the previous job should be set to
2649 the newest running job older than the current job. We decide on which
2650 alternative to use based on whether or not JOBSTATE(js.j_current) is
2653 candidate
= RUNNING (js
.j_current
) ? job_last_running (js
.j_current
)
2654 : job_last_running (js
.j_jobslots
);
2656 if (candidate
!= NO_JOB
)
2658 js
.j_previous
= candidate
;
2662 /* There is only a single job, and it is both `+' and `-'. */
2663 js
.j_previous
= js
.j_current
;
2666 /* Make current_job be something useful, if it isn't already. */
2668 /* Here's the deal: The newest non-running job should be `+', and the
2669 next-newest non-running job should be `-'. If there is only a single
2670 stopped job, the js.j_previous is the newest non-running job. If there
2671 are only running jobs, the newest running job is `+' and the
2672 next-newest running job is `-'. Must be called with SIGCHLD blocked. */
2679 if (js
.j_jobslots
&& js
.j_current
!= NO_JOB
&& jobs
[js
.j_current
] && STOPPED (js
.j_current
))
2680 candidate
= js
.j_current
;
2685 /* First choice: the previous job. */
2686 if (js
.j_previous
!= NO_JOB
&& jobs
[js
.j_previous
] && STOPPED (js
.j_previous
))
2687 candidate
= js
.j_previous
;
2689 /* Second choice: the most recently stopped job. */
2690 if (candidate
== NO_JOB
)
2691 candidate
= job_last_stopped (js
.j_jobslots
);
2693 /* Third choice: the newest running job. */
2694 if (candidate
== NO_JOB
)
2695 candidate
= job_last_running (js
.j_jobslots
);
2698 /* If we found a job to use, then use it. Otherwise, there
2699 are no jobs period. */
2700 if (candidate
!= NO_JOB
)
2701 set_current_job (candidate
);
2703 js
.j_current
= js
.j_previous
= NO_JOB
;
2706 /* Set up the job structures so we know the job and its processes are
2709 set_job_running (job
)
2712 register PROCESS
*p
;
2714 /* Each member of the pipeline is now running. */
2715 p
= jobs
[job
]->pipe
;
2719 if (WIFSTOPPED (p
->status
))
2720 p
->running
= PS_RUNNING
; /* XXX - could be PS_STOPPED */
2723 while (p
!= jobs
[job
]->pipe
);
2725 /* This means that the job is running. */
2726 JOBSTATE (job
) = JRUNNING
;
2729 /* Start a job. FOREGROUND if non-zero says to do that. Otherwise,
2730 start the job in the background. JOB is a zero-based index into
2731 JOBS. Returns -1 if it is unable to start a job, and the return
2732 status of the job otherwise. */
2734 start_job (job
, foreground
)
2735 int job
, foreground
;
2737 register PROCESS
*p
;
2738 int already_running
;
2741 static TTYSTRUCT save_stty
;
2743 BLOCK_CHILD (set
, oset
);
2747 internal_error (_("%s: job has terminated"), this_command_name
);
2748 UNBLOCK_CHILD (oset
);
2752 already_running
= RUNNING (job
);
2754 if (foreground
== 0 && already_running
)
2756 internal_error (_("%s: job %d already in background"), this_command_name
, job
+ 1);
2757 UNBLOCK_CHILD (oset
);
2758 return (0); /* XPG6/SUSv3 says this is not an error */
2761 wd
= current_working_directory ();
2763 /* You don't know about the state of this job. Do you? */
2764 jobs
[job
]->flags
&= ~J_NOTIFIED
;
2768 set_current_job (job
);
2769 jobs
[job
]->flags
|= J_FOREGROUND
;
2772 /* Tell the outside world what we're doing. */
2773 p
= jobs
[job
]->pipe
;
2775 if (foreground
== 0)
2777 /* POSIX.2 says `bg' doesn't give any indication about current or
2779 if (posixly_correct
== 0)
2780 s
= (job
== js
.j_current
) ? "+ ": ((job
== js
.j_previous
) ? "- " : " ");
2783 printf ("[%d]%s", job
+ 1, s
);
2789 p
->command
? p
->command
: "",
2790 p
->next
!= jobs
[job
]->pipe
? " | " : "");
2793 while (p
!= jobs
[job
]->pipe
);
2795 if (foreground
== 0)
2798 if (strcmp (wd
, jobs
[job
]->wd
) != 0)
2799 printf (" (wd: %s)", polite_directory_format (jobs
[job
]->wd
));
2804 if (already_running
== 0)
2805 set_job_running (job
);
2807 /* Save the tty settings before we start the job in the foreground. */
2811 save_stty
= shell_tty_info
;
2812 /* Give the terminal to this job. */
2813 if (IS_JOBCONTROL (job
))
2814 give_terminal_to (jobs
[job
]->pgrp
, 0);
2817 jobs
[job
]->flags
&= ~J_FOREGROUND
;
2819 /* If the job is already running, then don't bother jump-starting it. */
2820 if (already_running
== 0)
2822 jobs
[job
]->flags
|= J_NOTIFIED
;
2823 killpg (jobs
[job
]->pgrp
, SIGCONT
);
2831 pid
= find_last_pid (job
, 0);
2832 UNBLOCK_CHILD (oset
);
2834 shell_tty_info
= save_stty
;
2841 UNBLOCK_CHILD (oset
);
2846 /* Give PID SIGNAL. This determines what job the pid belongs to (if any).
2847 If PID does belong to a job, and the job is stopped, then CONTinue the
2848 job after giving it SIGNAL. Returns -1 on failure. If GROUP is non-null,
2849 then kill the process group associated with PID. */
2851 kill_pid (pid
, sig
, group
)
2855 register PROCESS
*p
;
2856 int job
, result
, negative
;
2862 group
= negative
= 1;
2867 result
= EXECUTION_SUCCESS
;
2870 BLOCK_CHILD (set
, oset
);
2871 p
= find_pipeline (pid
, 0, &job
);
2875 jobs
[job
]->flags
&= ~J_NOTIFIED
;
2877 /* Kill process in backquotes or one started without job control? */
2879 /* If we're passed a pid < -1, just call killpg and see what happens */
2880 if (negative
&& jobs
[job
]->pgrp
== shell_pgrp
)
2881 result
= killpg (pid
, sig
);
2882 /* If we're killing using job control notification, for example,
2883 without job control active, we have to do things ourselves. */
2884 else if (jobs
[job
]->pgrp
== shell_pgrp
)
2886 p
= jobs
[job
]->pipe
;
2889 if (PALIVE (p
) == 0)
2890 continue; /* avoid pid recycling problem */
2892 if (PEXITED (p
) && (sig
== SIGTERM
|| sig
== SIGHUP
))
2893 kill (p
->pid
, SIGCONT
);
2896 while (p
!= jobs
[job
]->pipe
);
2900 result
= killpg (jobs
[job
]->pgrp
, sig
);
2901 if (p
&& STOPPED (job
) && (sig
== SIGTERM
|| sig
== SIGHUP
))
2902 killpg (jobs
[job
]->pgrp
, SIGCONT
);
2903 /* If we're continuing a stopped job via kill rather than bg or
2904 fg, emulate the `bg' behavior. */
2905 if (p
&& STOPPED (job
) && (sig
== SIGCONT
))
2907 set_job_running (job
);
2908 jobs
[job
]->flags
&= ~J_FOREGROUND
;
2909 jobs
[job
]->flags
|= J_NOTIFIED
;
2914 result
= killpg (pid
, sig
);
2916 UNBLOCK_CHILD (oset
);
2919 result
= kill (pid
, sig
);
2924 /* sigchld_handler () flushes at least one of the children that we are
2925 waiting for. It gets run when we have gotten a SIGCHLD signal. */
2927 sigchld_handler (sig
)
2933 REINSTALL_SIGCHLD_HANDLER
;
2936 if (queue_sigchld
== 0)
2937 n
= waitchld (-1, 0);
2942 /* waitchld() reaps dead or stopped children. It's called by wait_for and
2943 sigchld_handler, and runs until there aren't any children terminating any
2945 If BLOCK is 1, this is to be a blocking wait for a single child, although
2946 an arriving SIGCHLD could cause the wait to be non-blocking. It returns
2947 the number of children reaped, or -1 if there are no unwaited-for child
2950 waitchld (wpid
, block
)
2957 int call_set_current
, last_stopped_job
, job
, children_exited
, waitpid_flags
;
2958 static int wcontinued
= WCONTINUED
; /* run-time fix for glibc problem */
2960 call_set_current
= children_exited
= 0;
2961 last_stopped_job
= NO_JOB
;
2965 /* We don't want to be notified about jobs stopping if job control
2966 is not active. XXX - was interactive_shell instead of job_control */
2967 waitpid_flags
= (job_control
&& subshell_environment
== 0)
2968 ? (WUNTRACED
|wcontinued
)
2970 if (sigchld
|| block
== 0)
2971 waitpid_flags
|= WNOHANG
;
2973 pid
= WAITPID (-1, &status
, waitpid_flags
);
2975 /* WCONTINUED may be rejected by waitpid as invalid even when defined */
2976 if (wcontinued
&& pid
< 0 && errno
== EINVAL
)
2979 continue; /* jump back to the test and retry without WCONTINUED */
2982 /* The check for WNOHANG is to make sure we decrement sigchld only
2983 if it was non-zero before we called waitpid. */
2984 if (sigchld
> 0 && (waitpid_flags
& WNOHANG
))
2987 /* If waitpid returns -1 with errno == ECHILD, there are no more
2988 unwaited-for child processes of this shell. */
2989 if (pid
< 0 && errno
== ECHILD
)
2991 if (children_exited
== 0)
2997 /* If waitpid returns 0, there are running children. If it returns -1,
2998 the only other error POSIX says it can return is EINTR. */
3001 continue; /* jumps right to the test */
3003 /* children_exited is used to run traps on SIGCHLD. We don't want to
3004 run the trap if a process is just being continued. */
3005 if (WIFCONTINUED(status
) == 0)
3011 /* Locate our PROCESS for this pid. */
3012 child
= find_process (pid
, 1, &job
); /* want living procs only */
3014 /* It is not an error to have a child terminate that we did
3015 not have a record of. This child could have been part of
3016 a pipeline in backquote substitution. Even so, I'm not
3017 sure child is ever non-zero. */
3021 /* Remember status, and whether or not the process is running. */
3022 child
->status
= status
;
3023 child
->running
= WIFCONTINUED(status
) ? PS_RUNNING
: PS_DONE
;
3025 if (PEXITED (child
))
3035 call_set_current
+= set_job_status_and_cleanup (job
);
3038 last_stopped_job
= job
;
3039 else if (DEADJOB (job
) && last_stopped_job
== job
)
3040 last_stopped_job
= NO_JOB
;
3042 while ((sigchld
|| block
== 0) && pid
> (pid_t
)0);
3044 /* If a job was running and became stopped, then set the current
3045 job. Otherwise, don't change a thing. */
3046 if (call_set_current
)
3048 if (last_stopped_job
!= NO_JOB
)
3049 set_current_job (last_stopped_job
);
3054 /* Call a SIGCHLD trap handler for each child that exits, if one is set. */
3055 if (job_control
&& signal_is_trapped (SIGCHLD
) && children_exited
&&
3056 trap_list
[SIGCHLD
] != (char *)IGNORE_SIG
)
3057 run_sigchld_trap (children_exited
);
3059 /* We have successfully recorded the useful information about this process
3060 that has just changed state. If we notify asynchronously, and the job
3061 that this process belongs to is no longer running, then notify the user
3062 of that fact now. */
3063 if (asynchronous_notification
&& interactive
)
3064 notify_of_job_status ();
3066 return (children_exited
);
3069 /* Set the status of JOB and perform any necessary cleanup if the job is
3072 Currently, the cleanup activity is restricted to handling any SIGINT
3073 received while waiting for a foreground job to finish. */
3075 set_job_status_and_cleanup (job
)
3079 int tstatus
, job_state
, any_stopped
, any_tstped
, call_set_current
;
3080 SigHandler
*temp_handler
;
3082 child
= jobs
[job
]->pipe
;
3083 jobs
[job
]->flags
&= ~J_NOTIFIED
;
3085 call_set_current
= 0;
3088 * COMPUTE JOB STATUS
3091 /* If all children are not running, but any of them is stopped, then
3092 the job is stopped, not dead. */
3093 job_state
= any_stopped
= any_tstped
= 0;
3096 job_state
|= PRUNNING (child
);
3098 if (PEXITED (child
) && (WIFSTOPPED (child
->status
)))
3100 /* Only checking for WIFSTOPPED now, not for PS_DONE */
3101 if (PSTOPPED (child
))
3105 any_tstped
|= interactive
&& job_control
&&
3106 (WSTOPSIG (child
->status
) == SIGTSTP
);
3108 child
= child
->next
;
3110 while (child
!= jobs
[job
]->pipe
);
3112 /* If job_state != 0, the job is still running, so don't bother with
3113 setting the process exit status and job state unless we're
3114 transitioning from stopped to running. */
3115 if (job_state
!= 0 && JOBSTATE(job
) != JSTOPPED
)
3122 /* The job is either stopped or dead. Set the state of the job accordingly. */
3125 jobs
[job
]->state
= JSTOPPED
;
3126 jobs
[job
]->flags
&= ~J_FOREGROUND
;
3128 /* Suspending a job with SIGTSTP breaks all active loops. */
3129 if (any_tstped
&& loop_level
)
3130 breaking
= loop_level
;
3132 else if (job_state
!= 0) /* was stopped, now running */
3134 jobs
[job
]->state
= JRUNNING
;
3139 jobs
[job
]->state
= JDEAD
;
3143 if (IS_FOREGROUND (job
))
3147 /* If this job has a cleanup function associated with it, call it
3148 with `cleanarg' as the single argument, then set the function
3149 pointer to NULL so it is not inadvertently called twice. The
3150 cleanup function is responsible for deallocating cleanarg. */
3151 if (jobs
[job
]->j_cleanup
)
3153 (*jobs
[job
]->j_cleanup
) (jobs
[job
]->cleanarg
);
3154 jobs
[job
]->j_cleanup
= (sh_vptrfunc_t
*)NULL
;
3161 * Currently, we just do special things if we got a SIGINT while waiting
3162 * for a foreground job to complete
3165 if (JOBSTATE (job
) == JDEAD
)
3167 /* If we're running a shell script and we get a SIGINT with a
3168 SIGINT trap handler, but the foreground job handles it and
3169 does not exit due to SIGINT, run the trap handler but do not
3170 otherwise act as if we got the interrupt. */
3171 if (wait_sigint_received
&& interactive_shell
== 0 &&
3172 WIFSIGNALED (child
->status
) == 0 && IS_FOREGROUND (job
) &&
3173 signal_is_trapped (SIGINT
))
3176 wait_sigint_received
= 0;
3177 last_command_exit_value
= process_exit_status (child
->status
);
3179 old_frozen
= jobs_list_frozen
;
3180 jobs_list_frozen
= 1;
3181 tstatus
= maybe_call_trap_handler (SIGINT
);
3182 jobs_list_frozen
= old_frozen
;
3185 /* If the foreground job is killed by SIGINT when job control is not
3186 active, we need to perform some special handling.
3188 The check of wait_sigint_received is a way to determine if the
3189 SIGINT came from the keyboard (in which case the shell has already
3190 seen it, and wait_sigint_received is non-zero, because keyboard
3191 signals are sent to process groups) or via kill(2) to the foreground
3192 process by another process (or itself). If the shell did receive the
3193 SIGINT, it needs to perform normal SIGINT processing. */
3194 else if (wait_sigint_received
&& (WTERMSIG (child
->status
) == SIGINT
) &&
3195 IS_FOREGROUND (job
) && IS_JOBCONTROL (job
) == 0)
3199 wait_sigint_received
= 0;
3201 /* If SIGINT is trapped, set the exit status so that the trap
3202 handler can see it. */
3203 if (signal_is_trapped (SIGINT
))
3204 last_command_exit_value
= process_exit_status (child
->status
);
3206 /* If the signal is trapped, let the trap handler get it no matter
3207 what and simply return if the trap handler returns.
3208 maybe_call_trap_handler() may cause dead jobs to be removed from
3209 the job table because of a call to execute_command. We work
3210 around this by setting JOBS_LIST_FROZEN. */
3211 old_frozen
= jobs_list_frozen
;
3212 jobs_list_frozen
= 1;
3213 tstatus
= maybe_call_trap_handler (SIGINT
);
3214 jobs_list_frozen
= old_frozen
;
3215 if (tstatus
== 0 && old_sigint_handler
!= INVALID_SIGNAL_HANDLER
)
3217 /* wait_sigint_handler () has already seen SIGINT and
3218 allowed the wait builtin to jump out. We need to
3219 call the original SIGINT handler, if necessary. If
3220 the original handler is SIG_DFL, we need to resend
3221 the signal to ourselves. */
3223 temp_handler
= old_sigint_handler
;
3225 /* Bogus. If we've reset the signal handler as the result
3226 of a trap caught on SIGINT, then old_sigint_handler
3227 will point to trap_handler, which now knows nothing about
3228 SIGINT (if we reset the sighandler to the default).
3229 In this case, we have to fix things up. What a crock. */
3230 if (temp_handler
== trap_handler
&& signal_is_trapped (SIGINT
) == 0)
3231 temp_handler
= trap_to_sighandler (SIGINT
);
3232 restore_sigint_handler ();
3233 if (temp_handler
== SIG_DFL
)
3234 termsig_handler (SIGINT
);
3235 else if (temp_handler
!= SIG_IGN
)
3236 (*temp_handler
) (SIGINT
);
3241 return call_set_current
;
3244 /* Build the array of values for the $PIPESTATUS variable from the set of
3245 exit statuses of all processes in the job J. */
3250 #if defined (ARRAY_VARS)
3252 register PROCESS
*p
;
3254 for (i
= 1, p
= jobs
[j
]->pipe
; p
->next
!= jobs
[j
]->pipe
; p
= p
->next
, i
++)
3259 pstatuses
= (int *)xrealloc (pstatuses
, i
* sizeof (int));
3266 pstatuses
[i
++] = process_exit_status (p
->status
);
3269 while (p
!= jobs
[j
]->pipe
);
3271 pstatuses
[i
] = -1; /* sentinel */
3272 set_pipestatus_array (pstatuses
, i
);
3277 run_sigchld_trap (nchild
)
3283 /* Turn off the trap list during the call to parse_and_execute ()
3284 to avoid potentially infinite recursive calls. Preserve the
3285 values of last_command_exit_value, last_made_pid, and the_pipeline
3286 around the execution of the trap commands. */
3287 trap_command
= savestring (trap_list
[SIGCHLD
]);
3289 begin_unwind_frame ("SIGCHLD trap");
3290 unwind_protect_int (last_command_exit_value
);
3291 unwind_protect_int (last_command_exit_signal
);
3292 unwind_protect_var (last_made_pid
);
3293 unwind_protect_int (interrupt_immediately
);
3294 unwind_protect_int (jobs_list_frozen
);
3295 unwind_protect_pointer (the_pipeline
);
3296 unwind_protect_pointer (subst_assign_varlist
);
3298 /* We have to add the commands this way because they will be run
3299 in reverse order of adding. We don't want maybe_set_sigchld_trap ()
3300 to reference freed memory. */
3301 add_unwind_protect (xfree
, trap_command
);
3302 add_unwind_protect (maybe_set_sigchld_trap
, trap_command
);
3304 subst_assign_varlist
= (WORD_LIST
*)NULL
;
3305 the_pipeline
= (PROCESS
*)NULL
;
3307 restore_default_signal (SIGCHLD
);
3308 jobs_list_frozen
= 1;
3309 for (i
= 0; i
< nchild
; i
++)
3311 interrupt_immediately
= 1;
3312 parse_and_execute (savestring (trap_command
), "trap", SEVAL_NOHIST
|SEVAL_RESETLINE
);
3315 run_unwind_frame ("SIGCHLD trap");
3318 /* Function to call when you want to notify people of changes
3319 in job status. This prints out all jobs which are pending
3320 notification to stderr, and marks those printed as already
3321 notified, thus making them candidates for cleanup. */
3323 notify_of_job_status ()
3325 register int job
, termsig
;
3330 if (jobs
== 0 || js
.j_jobslots
== 0)
3336 sigaddset (&set
, SIGCHLD
);
3337 sigaddset (&set
, SIGTTOU
);
3338 sigemptyset (&oset
);
3339 sigprocmask (SIG_BLOCK
, &set
, &oset
);
3344 /* XXX could use js.j_firstj here */
3345 for (job
= 0, dir
= (char *)NULL
; job
< js
.j_jobslots
; job
++)
3347 if (jobs
[job
] && IS_NOTIFIED (job
) == 0)
3349 s
= raw_job_exit_status (job
);
3350 termsig
= WTERMSIG (s
);
3352 /* POSIX.2 says we have to hang onto the statuses of at most the
3353 last CHILD_MAX background processes if the shell is running a
3354 script. If the shell is running a script, either from a file
3355 or standard input, don't print anything unless the job was
3356 killed by a signal. */
3357 if (startup_state
== 0 && WIFSIGNALED (s
) == 0 &&
3358 ((DEADJOB (job
) && IS_FOREGROUND (job
) == 0) || STOPPED (job
)))
3362 /* If job control is disabled, don't print the status messages.
3363 Mark dead jobs as notified so that they get cleaned up. If
3364 startup_state == 2, we were started to run `-c command', so
3365 don't print anything. */
3366 if ((job_control
== 0 && interactive_shell
) || startup_state
== 2)
3368 /* If job control is disabled, don't print the status messages.
3369 Mark dead jobs as notified so that they get cleaned up. If
3370 startup_state == 2 and subshell_environment has the
3371 SUBSHELL_COMSUB bit turned on, we were started to run a command
3372 substitution, so don't print anything. */
3373 if ((job_control
== 0 && interactive_shell
) ||
3374 (startup_state
== 2 && (subshell_environment
& SUBSHELL_COMSUB
)))
3377 /* POSIX.2 compatibility: if the shell is not interactive,
3378 hang onto the job corresponding to the last asynchronous
3379 pid until the user has been notified of its status or does
3381 if (DEADJOB (job
) && (interactive_shell
|| (find_last_pid (job
, 0) != last_asynchronous_pid
)))
3382 jobs
[job
]->flags
|= J_NOTIFIED
;
3386 /* Print info on jobs that are running in the background,
3387 and on foreground jobs that were killed by anything
3388 except SIGINT (and possibly SIGPIPE). */
3389 switch (JOBSTATE (job
))
3392 if (interactive_shell
== 0 && termsig
&& WIFSIGNALED (s
) &&
3393 termsig
!= SIGINT
&&
3394 #if defined (DONT_REPORT_SIGPIPE)
3395 termsig
!= SIGPIPE
&&
3397 signal_is_trapped (termsig
) == 0)
3399 /* Don't print `0' for a line number. */
3400 fprintf (stderr
, "%s: line %d: ", get_name_for_error (), (line_number
== 0) ? 1 : line_number
);
3401 pretty_print_job (job
, JLIST_NONINTERACTIVE
, stderr
);
3403 else if (IS_FOREGROUND (job
))
3405 #if !defined (DONT_REPORT_SIGPIPE)
3406 if (termsig
&& WIFSIGNALED (s
) && termsig
!= SIGINT
)
3408 if (termsig
&& WIFSIGNALED (s
) && termsig
!= SIGINT
&& termsig
!= SIGPIPE
)
3411 fprintf (stderr
, "%s", j_strsignal (termsig
));
3414 fprintf (stderr
, " (core dumped)");
3416 fprintf (stderr
, "\n");
3419 else if (job_control
) /* XXX job control test added */
3422 dir
= current_working_directory ();
3423 pretty_print_job (job
, JLIST_STANDARD
, stderr
);
3424 if (dir
&& strcmp (dir
, jobs
[job
]->wd
) != 0)
3426 "(wd now: %s)\n", polite_directory_format (dir
));
3429 jobs
[job
]->flags
|= J_NOTIFIED
;
3433 fprintf (stderr
, "\n");
3435 dir
= current_working_directory ();
3436 pretty_print_job (job
, JLIST_STANDARD
, stderr
);
3437 if (dir
&& (strcmp (dir
, jobs
[job
]->wd
) != 0))
3439 "(wd now: %s)\n", polite_directory_format (dir
));
3440 jobs
[job
]->flags
|= J_NOTIFIED
;
3448 programming_error ("notify_of_job_status");
3453 sigprocmask (SIG_SETMASK
, &oset
, (sigset_t
*)NULL
);
3458 /* Initialize the job control mechanism, and set up the tty stuff. */
3460 initialize_job_control (force
)
3463 shell_pgrp
= getpgid (0);
3465 if (shell_pgrp
== -1)
3467 sys_error ("initialize_job_control: getpgrp failed");
3471 /* We can only have job control if we are interactive. */
3472 if (interactive
== 0)
3475 original_pgrp
= NO_PID
;
3476 shell_tty
= fileno (stderr
);
3480 /* Get our controlling terminal. If job_control is set, or
3481 interactive is set, then this is an interactive shell no
3482 matter where fd 2 is directed. */
3483 shell_tty
= dup (fileno (stderr
)); /* fd 2 */
3485 shell_tty
= move_to_high_fd (shell_tty
, 1, -1);
3487 /* Compensate for a bug in systems that compiled the BSD
3488 rlogind with DEBUG defined, like NeXT and Alliant. */
3489 if (shell_pgrp
== 0)
3491 shell_pgrp
= getpid ();
3492 setpgid (0, shell_pgrp
);
3493 tcsetpgrp (shell_tty
, shell_pgrp
);
3496 while ((terminal_pgrp
= tcgetpgrp (shell_tty
)) != -1)
3498 if (shell_pgrp
!= terminal_pgrp
)
3502 ottin
= set_signal_handler(SIGTTIN
, SIG_DFL
);
3504 set_signal_handler (SIGTTIN
, ottin
);
3510 /* Make sure that we are using the new line discipline. */
3511 if (set_new_line_discipline (shell_tty
) < 0)
3513 sys_error ("initialize_job_control: line discipline");
3518 original_pgrp
= shell_pgrp
;
3519 shell_pgrp
= getpid ();
3521 if ((original_pgrp
!= shell_pgrp
) && (setpgid (0, shell_pgrp
) < 0))
3523 sys_error ("initialize_job_control: setpgid");
3524 shell_pgrp
= original_pgrp
;
3529 /* If (and only if) we just set our process group to our pid,
3530 thereby becoming a process group leader, and the terminal
3531 is not in the same process group as our (new) process group,
3532 then set the terminal's process group to our (new) process
3533 group. If that fails, set our process group back to what it
3534 was originally (so we can still read from the terminal) and
3535 turn off job control. */
3536 if (shell_pgrp
!= original_pgrp
&& shell_pgrp
!= terminal_pgrp
)
3538 if (give_terminal_to (shell_pgrp
, 0) < 0)
3540 setpgid (0, original_pgrp
);
3541 shell_pgrp
= original_pgrp
;
3546 if (job_control
== 0)
3547 internal_error (_("no job control in this shell"));
3550 if (shell_tty
!= fileno (stderr
))
3551 SET_CLOSE_ON_EXEC (shell_tty
);
3553 set_signal_handler (SIGCHLD
, sigchld_handler
);
3555 change_flag ('m', job_control
? '-' : '+');
3560 if (js
.c_childmax
< 0)
3561 js
.c_childmax
= getmaxchild ();
3562 if (js
.c_childmax
< 0)
3563 js
.c_childmax
= DEFAULT_CHILD_MAX
;
3570 debug_print_pgrps ()
3572 itrace("original_pgrp = %ld shell_pgrp = %ld terminal_pgrp = %ld",
3573 (long)original_pgrp
, (long)shell_pgrp
, (long)terminal_pgrp
);
3574 itrace("tcgetpgrp(%d) -> %ld, getpgid(0) -> %ld",
3575 shell_tty
, (long)tcgetpgrp (shell_tty
), (long)getpgid(0));
3579 /* Set the line discipline to the best this system has to offer.
3580 Return -1 if this is not possible. */
3582 set_new_line_discipline (tty
)
3585 #if defined (NEW_TTY_DRIVER)
3588 if (ioctl (tty
, TIOCGETD
, &ldisc
) < 0)
3591 if (ldisc
!= NTTYDISC
)
3595 if (ioctl (tty
, TIOCSETD
, &ldisc
) < 0)
3599 #endif /* NEW_TTY_DRIVER */
3601 #if defined (TERMIO_TTY_DRIVER)
3602 # if defined (TERMIO_LDISC) && (NTTYDISC)
3603 if (ioctl (tty
, TCGETA
, &shell_tty_info
) < 0)
3606 if (shell_tty_info
.c_line
!= NTTYDISC
)
3608 shell_tty_info
.c_line
= NTTYDISC
;
3609 if (ioctl (tty
, TCSETAW
, &shell_tty_info
) < 0)
3612 # endif /* TERMIO_LDISC && NTTYDISC */
3614 #endif /* TERMIO_TTY_DRIVER */
3616 #if defined (TERMIOS_TTY_DRIVER)
3617 # if defined (TERMIOS_LDISC) && defined (NTTYDISC)
3618 if (tcgetattr (tty
, &shell_tty_info
) < 0)
3621 if (shell_tty_info
.c_line
!= NTTYDISC
)
3623 shell_tty_info
.c_line
= NTTYDISC
;
3624 if (tcsetattr (tty
, TCSADRAIN
, &shell_tty_info
) < 0)
3627 # endif /* TERMIOS_LDISC && NTTYDISC */
3629 #endif /* TERMIOS_TTY_DRIVER */
3631 #if !defined (NEW_TTY_DRIVER) && !defined (TERMIO_TTY_DRIVER) && !defined (TERMIOS_TTY_DRIVER)
3636 /* Setup this shell to handle C-C, etc. */
3638 initialize_job_signals ()
3642 set_signal_handler (SIGINT
, sigint_sighandler
);
3643 set_signal_handler (SIGTSTP
, SIG_IGN
);
3644 set_signal_handler (SIGTTOU
, SIG_IGN
);
3645 set_signal_handler (SIGTTIN
, SIG_IGN
);
3647 else if (job_control
)
3649 old_tstp
= set_signal_handler (SIGTSTP
, sigstop_sighandler
);
3650 old_ttin
= set_signal_handler (SIGTTIN
, sigstop_sighandler
);
3651 old_ttou
= set_signal_handler (SIGTTOU
, sigstop_sighandler
);
3653 /* Leave these things alone for non-interactive shells without job
3657 /* Here we handle CONT signals. */
3659 sigcont_sighandler (sig
)
3662 initialize_job_signals ();
3663 set_signal_handler (SIGCONT
, old_cont
);
3664 kill (getpid (), SIGCONT
);
3669 /* Here we handle stop signals while we are running not as a login shell. */
3671 sigstop_sighandler (sig
)
3674 set_signal_handler (SIGTSTP
, old_tstp
);
3675 set_signal_handler (SIGTTOU
, old_ttou
);
3676 set_signal_handler (SIGTTIN
, old_ttin
);
3678 old_cont
= set_signal_handler (SIGCONT
, sigcont_sighandler
);
3680 give_terminal_to (shell_pgrp
, 0);
3682 kill (getpid (), sig
);
3687 /* Give the terminal to PGRP. */
3689 give_terminal_to (pgrp
, force
)
3697 if (job_control
|| force
)
3700 sigaddset (&set
, SIGTTOU
);
3701 sigaddset (&set
, SIGTTIN
);
3702 sigaddset (&set
, SIGTSTP
);
3703 sigaddset (&set
, SIGCHLD
);
3704 sigemptyset (&oset
);
3705 sigprocmask (SIG_BLOCK
, &set
, &oset
);
3707 if (tcsetpgrp (shell_tty
, pgrp
) < 0)
3709 /* Maybe we should print an error message? */
3711 sys_error ("tcsetpgrp(%d) failed: pid %ld to pgrp %ld",
3712 shell_tty
, (long)getpid(), (long)pgrp
);
3717 terminal_pgrp
= pgrp
;
3718 sigprocmask (SIG_SETMASK
, &oset
, (sigset_t
*)NULL
);
3724 /* Clear out any jobs in the job array. This is intended to be used by
3725 children of the shell, who should not have any job structures as baggage
3726 when they start executing (forking subshells for parenthesized execution
3727 and functions with pipes are the two that spring to mind). If RUNNING_ONLY
3728 is nonzero, only running jobs are removed from the table. */
3730 delete_all_jobs (running_only
)
3736 BLOCK_CHILD (set
, oset
);
3738 /* XXX - need to set j_lastj, j_firstj appropriately if running_only != 0. */
3741 js
.j_current
= js
.j_previous
= NO_JOB
;
3743 /* XXX could use js.j_firstj here */
3744 for (i
= 0; i
< js
.j_jobslots
; i
++)
3747 if (i
< js
.j_firstj
&& jobs
[i
])
3748 itrace("delete_all_jobs: job %d non-null before js.j_firstj (%d)", i
, js
.j_firstj
);
3749 if (i
> js
.j_lastj
&& jobs
[i
])
3750 itrace("delete_all_jobs: job %d non-null after js.j_lastj (%d)", i
, js
.j_lastj
);
3752 if (jobs
[i
] && (running_only
== 0 || (running_only
&& RUNNING(i
))))
3753 delete_job (i
, DEL_WARNSTOPPED
);
3755 if (running_only
== 0)
3757 free ((char *)jobs
);
3759 js
.j_firstj
= js
.j_lastj
= js
.j_njobs
= 0;
3763 if (running_only
== 0)
3766 UNBLOCK_CHILD (oset
);
3769 /* Mark all jobs in the job array so that they don't get a SIGHUP when the
3770 shell gets one. If RUNNING_ONLY is nonzero, mark only running jobs. */
3772 nohup_all_jobs (running_only
)
3778 BLOCK_CHILD (set
, oset
);
3782 /* XXX could use js.j_firstj here */
3783 for (i
= 0; i
< js
.j_jobslots
; i
++)
3784 if (jobs
[i
] && (running_only
== 0 || (running_only
&& RUNNING(i
))))
3788 UNBLOCK_CHILD (oset
);
3797 /* This really counts all non-dead jobs. */
3798 BLOCK_CHILD (set
, oset
);
3799 /* XXX could use js.j_firstj here */
3800 for (i
= n
= 0; i
< js
.j_jobslots
; i
++)
3803 if (i
< js
.j_firstj
&& jobs
[i
])
3804 itrace("count_all_jobs: job %d non-null before js.j_firstj (%d)", i
, js
.j_firstj
);
3805 if (i
> js
.j_lastj
&& jobs
[i
])
3806 itrace("count_all_jobs: job %d non-null after js.j_lastj (%d)", i
, js
.j_lastj
);
3808 if (jobs
[i
] && DEADJOB(i
) == 0)
3811 UNBLOCK_CHILD (oset
);
3816 mark_all_jobs_as_dead ()
3821 if (js
.j_jobslots
== 0)
3824 BLOCK_CHILD (set
, oset
);
3826 /* XXX could use js.j_firstj here */
3827 for (i
= 0; i
< js
.j_jobslots
; i
++)
3830 jobs
[i
]->state
= JDEAD
;
3834 UNBLOCK_CHILD (oset
);
3837 /* Mark all dead jobs as notified, so delete_job () cleans them out
3838 of the job table properly. POSIX.2 says we need to save the
3839 status of the last CHILD_MAX jobs, so we count the number of dead
3840 jobs and mark only enough as notified to save CHILD_MAX statuses. */
3842 mark_dead_jobs_as_notified (force
)
3845 register int i
, ndead
, ndeadproc
;
3848 if (js
.j_jobslots
== 0)
3851 BLOCK_CHILD (set
, oset
);
3853 /* If FORCE is non-zero, we don't have to keep CHILD_MAX statuses
3854 around; just run through the array. */
3857 /* XXX could use js.j_firstj here */
3858 for (i
= 0; i
< js
.j_jobslots
; i
++)
3860 if (jobs
[i
] && DEADJOB (i
) && (interactive_shell
|| (find_last_pid (i
, 0) != last_asynchronous_pid
)))
3861 jobs
[i
]->flags
|= J_NOTIFIED
;
3863 UNBLOCK_CHILD (oset
);
3867 /* Mark enough dead jobs as notified to keep CHILD_MAX processes left in the
3868 array with the corresponding not marked as notified. This is a better
3869 way to avoid pid aliasing and reuse problems than keeping the POSIX-
3870 mandated CHILD_MAX jobs around. delete_job() takes care of keeping the
3871 bgpids list regulated. */
3873 /* Count the number of dead jobs */
3874 /* XXX could use js.j_firstj here */
3875 for (i
= ndead
= ndeadproc
= 0; i
< js
.j_jobslots
; i
++)
3878 if (i
< js
.j_firstj
&& jobs
[i
])
3879 itrace("mark_dead_jobs_as_notified: job %d non-null before js.j_firstj (%d)", i
, js
.j_firstj
);
3880 if (i
> js
.j_lastj
&& jobs
[i
])
3881 itrace("mark_dead_jobs_as_notified: job %d non-null after js.j_lastj (%d)", i
, js
.j_lastj
);
3883 if (jobs
[i
] && DEADJOB (i
))
3886 ndeadproc
+= processes_in_job (i
);
3891 if (ndeadproc
!= js
.c_reaped
)
3892 itrace("mark_dead_jobs_as_notified: ndeadproc (%d) != js.c_reaped (%d)", ndeadproc
, js
.c_reaped
);
3893 if (ndead
!= js
.j_ndead
)
3894 itrace("mark_dead_jobs_as_notified: ndead (%d) != js.j_ndead (%d)", ndead
, js
.j_ndead
);
3897 if (js
.c_childmax
< 0)
3898 js
.c_childmax
= getmaxchild ();
3899 if (js
.c_childmax
< 0)
3900 js
.c_childmax
= DEFAULT_CHILD_MAX
;
3902 /* Don't do anything if the number of dead processes is less than CHILD_MAX
3903 and we're not forcing a cleanup. */
3904 if (ndeadproc
<= js
.c_childmax
)
3906 UNBLOCK_CHILD (oset
);
3911 itrace("mark_dead_jobs_as_notified: child_max = %d ndead = %d ndeadproc = %d", js
.c_childmax
, ndead
, ndeadproc
);
3914 /* Mark enough dead jobs as notified that we keep CHILD_MAX jobs in
3915 the list. This isn't exactly right yet; changes need to be made
3916 to stop_pipeline so we don't mark the newer jobs after we've
3917 created CHILD_MAX slots in the jobs array. This needs to be
3918 integrated with a way to keep the jobs array from growing without
3919 bound. Maybe we wrap back around to 0 after we reach some max
3920 limit, and there are sufficient job slots free (keep track of total
3921 size of jobs array (js.j_jobslots) and running count of number of jobs
3922 in jobs array. Then keep a job index corresponding to the `oldest job'
3923 and start this loop there, wrapping around as necessary. In effect,
3924 we turn the list into a circular buffer. */
3925 /* XXX could use js.j_firstj here */
3926 for (i
= 0; i
< js
.j_jobslots
; i
++)
3928 if (jobs
[i
] && DEADJOB (i
) && (interactive_shell
|| (find_last_pid (i
, 0) != last_asynchronous_pid
)))
3931 if (i
< js
.j_firstj
&& jobs
[i
])
3932 itrace("mark_dead_jobs_as_notified: job %d non-null before js.j_firstj (%d)", i
, js
.j_firstj
);
3933 if (i
> js
.j_lastj
&& jobs
[i
])
3934 itrace("mark_dead_jobs_as_notified: job %d non-null after js.j_lastj (%d)", i
, js
.j_lastj
);
3936 /* If marking this job as notified would drop us down below
3937 child_max, don't mark it so we can keep at least child_max
3938 statuses. XXX -- need to check what Posix actually says
3939 about keeping statuses. */
3940 if ((ndeadproc
-= processes_in_job (i
)) <= js
.c_childmax
)
3942 jobs
[i
]->flags
|= J_NOTIFIED
;
3946 UNBLOCK_CHILD (oset
);
3949 /* Here to allow other parts of the shell (like the trap stuff) to
3950 unfreeze the jobs list. */
3952 unfreeze_jobs_list ()
3954 jobs_list_frozen
= 0;
3957 /* Allow or disallow job control to take place. Returns the old value
3960 set_job_control (arg
)
3968 /* If we're turning on job control, reset pipeline_pgrp so make_child will
3969 put new child processes into the right pgrp */
3970 if (job_control
!= old
&& job_control
)
3976 /* Turn off all traces of job control. This is run by children of the shell
3977 which are going to do shellsy things, like wait (), etc. */
3979 without_job_control ()
3981 stop_making_children ();
3983 #if defined (PGRP_PIPE)
3984 pipe_close (pgrp_pipe
);
3986 delete_all_jobs (0);
3987 set_job_control (0);
3990 /* If this shell is interactive, terminate all stopped jobs and
3991 restore the original terminal process group. This is done
3992 before the `exec' builtin calls shell_execve. */
3996 if (interactive_shell
) /* XXX - should it be interactive? */
3998 terminate_stopped_jobs ();
4000 if (original_pgrp
>= 0)
4001 give_terminal_to (original_pgrp
, 1);
4004 if (original_pgrp
>= 0)
4005 setpgid (0, original_pgrp
);
4008 /* Restart job control by closing shell tty and reinitializing. This is
4009 called after an exec fails in an interactive shell and we do not exit. */
4011 restart_job_control ()
4013 if (shell_tty
!= -1)
4015 initialize_job_control (0);
4018 /* Set the handler to run when the shell receives a SIGCHLD signal. */
4020 set_sigchld_handler ()
4022 set_signal_handler (SIGCHLD
, sigchld_handler
);
4025 #if defined (PGRP_PIPE)
4026 /* Read from the read end of a pipe. This is how the process group leader
4027 blocks until all of the processes in a pipeline have been made. */
4042 while (read (pp
[0], &ch
, 1) == -1 && errno
== EINTR
)
4047 /* Close the read and write ends of PP, an array of file descriptors. */
4061 /* Functional interface closes our local-to-job-control pipes. */
4065 pipe_close (pgrp_pipe
);
4068 #endif /* PGRP_PIPE */