1 This file is wait.def, from which is created wait.c.
2 It implements the builtin "wait" in Bash.
4 Copyright (C) 1987-2009 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
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation, either version 3 of the License, or
11 (at your option) any later version.
13 Bash is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with Bash. If not, see <http://www.gnu.org/licenses/>.
22 $FUNCTION wait_builtin
23 $DEPENDS_ON JOB_CONTROL
26 Wait for job completion and return exit status.
28 Waits for the process identified by ID, which may be a process ID or a
29 job specification, and reports its termination status. If ID is not
30 given, waits for all currently active child processes, and the return
31 status is zero. If ID is a a job specification, waits for all processes
32 in the job's pipeline.
35 Returns the status of ID; fails if ID is invalid or an invalid option is
40 $FUNCTION wait_builtin
41 $DEPENDS_ON !JOB_CONTROL
43 Wait for process completion and return exit status.
45 Waits for the specified process and reports its termination status. If
46 PID is not given, all currently active child processes are waited for,
47 and the return code is zero. PID must be a process ID.
50 Returns the status of ID; fails if ID is invalid or an invalid option is
56 #include "../bashtypes.h"
59 #if defined (HAVE_UNISTD_H)
63 #include <chartypes.h>
65 #include "../bashansi.h"
70 #include "bashgetopt.h"
72 extern int wait_signal_received;
74 procenv_t wait_intr_buf;
76 /* Wait for the pid in LIST to stop or die. If no arguments are given, then
77 wait for all of the active background processes of the shell and return
78 0. If a list of pids or job specs are given, return the exit status of
79 the last one waited for. */
81 #define WAIT_RETURN(s) \
84 interrupt_immediately = old_interrupt_immediately;\
94 volatile int old_interrupt_immediately;
98 if (no_options (list))
102 old_interrupt_immediately = interrupt_immediately;
103 interrupt_immediately++;
105 /* POSIX.2 says: When the shell is waiting (by means of the wait utility)
106 for asynchronous commands to complete, the reception of a signal for
107 which a trap has been set shall cause the wait utility to return
108 immediately with an exit status greater than 128, after which the trap
109 associated with the signal shall be taken.
111 We handle SIGINT here; it's the only one that needs to be treated
112 specially (I think), since it's handled specially in {no,}jobs.c. */
113 code = setjmp (wait_intr_buf);
116 status = 128 + wait_signal_received;
117 WAIT_RETURN (status);
120 /* We support jobs or pids.
121 wait <pid-or-job> [pid-or-job ...] */
123 /* But wait without any arguments means to wait for all of the shell's
124 currently active background processes. */
127 wait_for_background_pids ();
128 WAIT_RETURN (EXECUTION_SUCCESS);
131 status = EXECUTION_SUCCESS;
138 w = list->word->word;
141 if (legal_number (w, &pid_value) && pid_value == (pid_t)pid_value)
143 pid = (pid_t)pid_value;
144 status = wait_for_single_pid (pid);
149 WAIT_RETURN (EXECUTION_FAILURE);
152 #if defined (JOB_CONTROL)
153 else if (*w && *w == '%')
154 /* Must be a job spec. Check it out. */
159 BLOCK_CHILD (set, oset);
160 job = get_job_spec (list);
162 if (INVALID_JOB (job))
165 sh_badjob (list->word->word);
166 UNBLOCK_CHILD (oset);
167 status = 127; /* As per Posix.2, section 4.70.2 */
172 /* Job spec used. Wait for the last pid in the pipeline. */
173 UNBLOCK_CHILD (oset);
174 status = wait_for_job (job);
176 #endif /* JOB_CONTROL */
180 status = EXECUTION_FAILURE;
185 WAIT_RETURN (status);