1 This file is wait.def, from which is created wait.c.
2 It implements the builtin "wait" in Bash.
4 Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc.
6 This file is part of GNU Bash, the Bourne Again SHell.
8 Bash is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 1, or (at your option) any later
13 Bash is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License along
19 with Bash; see the file COPYING. If not, write to the Free Software
20 Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
24 $FUNCTION wait_builtin
25 $DEPENDS_ON JOB_CONTROL
28 Wait for the specified process and report its termination status. If
29 N is not given, all currently active child processes are waited for,
30 and the return code is zero. N may be a process ID or a job
31 specification; if a job spec is given, all processes in the job's
32 pipeline are waited for.
36 $FUNCTION wait_builtin
37 $DEPENDS_ON !JOB_CONTROL
39 Wait for the specified process and report its termination status. If
40 N is not given, all currently active child processes are waited for,
41 and the return code is zero. N is a process ID; if it is not given,
42 all child processes of the shell are waited for.
45 #include <sys/types.h>
50 extern int interrupt_immediately;
52 /* Wait for the pid in LIST to stop or die. If no arguments are given, then
53 wait for all of the active background processes of the shell and return
54 0. If a list of pids or job specs are given, return the exit status of
55 the last one waited for. */
59 int status = EXECUTION_SUCCESS;
61 begin_unwind_frame ("wait_builtin");
62 unwind_protect_int (interrupt_immediately);
63 interrupt_immediately++;
65 /* We support jobs or pids.
66 wait <pid-or-job> [pid-or-job ...] */
68 /* But wait without any arguments means to wait for all of the shell's
69 currently active background processes. */
72 wait_for_background_pids ();
73 status = EXECUTION_SUCCESS;
85 if (all_digits (w + 1))
87 pid = (pid_t)atoi (w);
88 status = wait_for_single_pid (pid);
92 builtin_error ("`%s' is not a pid or legal job spec", w);
93 status = EXECUTION_FAILURE;
97 #if defined (JOB_CONTROL)
98 else if (job_control && *w)
99 /* Must be a job spec. Check it out. */
104 BLOCK_CHILD (set, oset);
105 job = get_job_spec (list);
107 if (job < 0 || job >= job_slots || !jobs[job])
110 builtin_error ("No such job %s", list->word->word);
111 UNBLOCK_CHILD (oset);
112 status = 127; /* As per Posix.2, section 4.70.2 */
117 /* Job spec used. Wait for the last pid in the pipeline. */
118 UNBLOCK_CHILD (oset);
119 status = wait_for_job (job);
121 #endif /* JOB_CONTROL */
124 builtin_error ("`%s' is not a pid or legal job spec", w);
125 status = EXECUTION_FAILURE;
130 run_unwind_frame ("wait_builtin");