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- This file is wait.def, from which is created wait.c.
- It implements the builtin "wait" in Bash.
-
- Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc.
-
- This file is part of GNU Bash, the Bourne Again SHell.
-
- Bash is free software; you can redistribute it and/or modify it under
- the terms of the GNU General Public License as published by the Free
- Software Foundation; either version 1, or (at your option) any later
- version.
-
- Bash is distributed in the hope that it will be useful, but WITHOUT ANY
- WARRANTY; without even the implied warranty of MERCHANTABILITY or
- FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
- for more details.
-
- You should have received a copy of the GNU General Public License along
- with Bash; see the file COPYING. If not, write to the Free Software
- Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
-
-
- $BUILTIN wait
- $FUNCTION wait_builtin
- $DEPENDS_ON JOB_CONTROL
- $PRODUCES wait.c
- $SHORT_DOC wait [n]
- Wait for the specified process and report its termination status. If
- N is not given, all currently active child processes are waited for,
- and the return code is zero. N may be a process ID or a job
- specification; if a job spec is given, all processes in the job's
- pipeline are waited for.
- $END
-
- $BUILTIN wait
- $FUNCTION wait_builtin
- $DEPENDS_ON !JOB_CONTROL
- $SHORT_DOC wait [n]
- Wait for the specified process and report its termination status. If
- N is not given, all currently active child processes are waited for,
- and the return code is zero. N is a process ID; if it is not given,
- all child processes of the shell are waited for.
- $END
-
- #include <sys/types.h>
- #include <signal.h>
- #include "../shell.h"
- #include "../jobs.h"
- #if defined (JOB_CONTROL)
- extern int job_control;
- #endif /* JOB_CONTROL */
-
- /* Wait for the pid in LIST to stop or die. If no arguments are given, then
- wait for all of the active background processes of the shell and return
- 0. If a list of pids or job specs are given, return the exit status of
- the last one waited for. */
- wait_builtin (list)
- WORD_LIST *list;
- {
- extern void wait_for_background_pids ();
- extern int wait_for_single_pid ();
- extern int interrupt_immediately;
- int status = EXECUTION_SUCCESS;
-
- begin_unwind_frame ("wait_builtin");
- unwind_protect_int (interrupt_immediately);
- interrupt_immediately++;
-
- /* We support jobs or pids.
- wait <pid-or-job> [pid-or-job ...] */
-
- /* But wait without any arguments means to wait for all of the shell's
- currently active background processes. */
- if (!list)
- {
- wait_for_background_pids ();
- status = EXECUTION_SUCCESS;
- goto return_status;
- }
-
- while (list)
- {
- pid_t pid;
- if (digit (*(list->word->word)))
- {
- if (sscanf (list->word->word, "%d", &pid) == 1)
- status = wait_for_single_pid (pid);
- else
- {
- builtin_error
- ("`%s' is not a pid or job spec", list->word->word);
- status = EXECUTION_FAILURE;
- goto return_status;
- }
- }
- #if defined (JOB_CONTROL)
- else if (job_control)
- /* Must be a job spec. Check it out. */
- {
- int job;
- sigset_t set, oset;
-
- BLOCK_CHILD (set, oset);
- job = get_job_spec (list);
-
- if (job < 0 || job >= job_slots || !jobs[job])
- {
- if (job != DUP_JOB)
- builtin_error ("No such job %s", list->word->word);
- UNBLOCK_CHILD (oset);
- status = EXECUTION_FAILURE;
- list = list->next;
- continue;
- }
-
- /* Job spec used. Wait for the last pid in the pipeline. */
- UNBLOCK_CHILD (oset);
- status = wait_for_job (job);
- }
- #endif /* JOB_CONTROL */
- else
- {
- builtin_error ("%s is not a pid or legal job spec",
- list->word->word);
- status = EXECUTION_FAILURE;
- }
- list = list->next;
- }
- return_status:
- run_unwind_frame ("wait_builtin");
- return (status);
- }
-
-