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Diffstat (limited to 'builtins/wait.def~')
| -rw-r--r-- | builtins/wait.def~ | 218 |
1 files changed, 218 insertions, 0 deletions
diff --git a/builtins/wait.def~ b/builtins/wait.def~ new file mode 100644 index 00000000..2de7bfb6 --- /dev/null +++ b/builtins/wait.def~ @@ -0,0 +1,218 @@ +This file is wait.def, from which is created wait.c. +It implements the builtin "wait" in Bash. + +Copyright (C) 1987-2013 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 3 of the License, 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. If not, see <http://www.gnu.org/licenses/>. + +$BUILTIN wait +$FUNCTION wait_builtin +$DEPENDS_ON JOB_CONTROL +$PRODUCES wait.c +$SHORT_DOC wait [-n] [id ...] +Wait for job completion and return exit status. + +Waits for each process identified by an ID, which may be a process ID or a +job specification, and reports its termination status. If ID is not +given, waits for all currently active child processes, and the return +status is zero. If ID is a a job specification, waits for all processes +in that job's pipeline. + +If the -n option is supplied, waits for the next job to terminate and +returns its exit status. + +Exit Status: +Returns the status of the last ID; fails if ID is invalid or an invalid +option is given. +$END + +$BUILTIN wait +$FUNCTION wait_builtin +$DEPENDS_ON !JOB_CONTROL +$SHORT_DOC wait [pid ...] +Wait for process completion and return exit status. + +Waits for each process specified by a PID and reports its termination status. +If PID is not given, waits for all currently active child processes, +and the return status is zero. PID must be a process ID. + +Exit Status: +Returns the status of the last PID; fails if PID is invalid or an invalid +option is given. +$END + +#include <config.h> + +#include "../bashtypes.h" +#include <signal.h> + +#if defined (HAVE_UNISTD_H) +# include <unistd.h> +#endif + +#include <chartypes.h> + +#include "../bashansi.h" + +#include "../shell.h" +#include "../jobs.h" +#include "common.h" +#include "bashgetopt.h" + +extern int wait_signal_received; +extern int last_command_exit_signal; + +procenv_t wait_intr_buf; + +/* 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. */ + +#define WAIT_RETURN(s) \ + do \ + { \ + interrupt_immediately = old_interrupt_immediately;\ + wait_signal_received = 0; \ + return (s);\ + } \ + while (0) + +int +wait_builtin (list) + WORD_LIST *list; +{ + int status, code, opt, nflag; + volatile int old_interrupt_immediately; + + USE_VAR(list); + + nflag = 0; + reset_internal_getopt (); + while ((opt = internal_getopt (list, "n")) != -1) + { + switch (opt) + { +#if defined (JOB_CONTROL) + case 'n': + nflag = 1; + break; +#endif + default: + builtin_usage (); + return (EX_USAGE); + } + } + list = loptend; + + old_interrupt_immediately = interrupt_immediately; +#if 0 + interrupt_immediately++; +#endif + + /* POSIX.2 says: When the shell is waiting (by means of the wait utility) + for asynchronous commands to complete, the reception of a signal for + which a trap has been set shall cause the wait utility to return + immediately with an exit status greater than 128, after which the trap + associated with the signal shall be taken. + + We handle SIGINT here; it's the only one that needs to be treated + specially (I think), since it's handled specially in {no,}jobs.c. */ + code = setjmp_sigs (wait_intr_buf); + if (code) + { + last_command_exit_signal = wait_signal_received; + status = 128 + wait_signal_received; + WAIT_RETURN (status); + } + + /* We support jobs or pids. + wait <pid-or-job> [pid-or-job ...] */ + +#if defined (JOB_CONTROL) + if (nflag) + { + status = wait_for_any_job (); + if (status < 0) + status = 127; + WAIT_RETURN (status); + } +#endif + + /* But wait without any arguments means to wait for all of the shell's + currently active background processes. */ + if (list == 0) + { + wait_for_background_pids (); + WAIT_RETURN (EXECUTION_SUCCESS); + } + + status = EXECUTION_SUCCESS; + while (list) + { + pid_t pid; + char *w; + intmax_t pid_value; + + w = list->word->word; + if (DIGIT (*w)) + { + if (legal_number (w, &pid_value) && pid_value == (pid_t)pid_value) + { + pid = (pid_t)pid_value; + status = wait_for_single_pid (pid); + } + else + { + sh_badpid (w); + WAIT_RETURN (EXECUTION_FAILURE); + } + } +#if defined (JOB_CONTROL) + else if (*w && *w == '%') + /* Must be a job spec. Check it out. */ + { + int job; + sigset_t set, oset; + + BLOCK_CHILD (set, oset); + job = get_job_spec (list); + + if (INVALID_JOB (job)) + { + if (job != DUP_JOB) + sh_badjob (list->word->word); + UNBLOCK_CHILD (oset); + status = 127; /* As per Posix.2, section 4.70.2 */ + 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 + { + sh_badpid (w); + status = EXECUTION_FAILURE; + } + list = list->next; + } + + WAIT_RETURN (status); +} |