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176 lines
6.1 KiB
C
176 lines
6.1 KiB
C
8 years ago
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/* Copyright (C) 1991-2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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/*
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* POSIX Standard: 3.2.1 Wait for Process Termination <sys/wait.h>
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*/
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#ifndef _SYS_WAIT_H
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#define _SYS_WAIT_H 1
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#include <features.h>
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__BEGIN_DECLS
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#include <signal.h>
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/* These macros could also be defined in <stdlib.h>. */
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#if !defined _STDLIB_H || (!defined __USE_XOPEN && !defined __USE_XOPEN2K8)
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/* This will define the `W*' macros for the flag
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bits to `waitpid', `wait3', and `wait4'. */
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# include <bits/waitflags.h>
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# ifdef __USE_MISC
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/* Lots of hair to allow traditional BSD use of `union wait'
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as well as POSIX.1 use of `int' for the status word. */
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# if defined __GNUC__ && !defined __cplusplus
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# define __WAIT_INT(status) \
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(__extension__ (((union { __typeof(status) __in; int __i; }) \
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{ .__in = (status) }).__i))
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# else
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# define __WAIT_INT(status) (*(const int *) &(status))
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# endif
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/* This is the type of the argument to `wait'. The funky union
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causes redeclarations with either `int *' or `union wait *' to be
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allowed without complaint. __WAIT_STATUS_DEFN is the type used in
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the actual function definitions. */
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# if !defined __GNUC__ || __GNUC__ < 2 || defined __cplusplus
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# define __WAIT_STATUS void *
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# define __WAIT_STATUS_DEFN void *
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# else
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/* This works in GCC 2.6.1 and later. */
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typedef union
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{
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union wait *__uptr;
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int *__iptr;
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} __WAIT_STATUS __attribute__ ((__transparent_union__));
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# define __WAIT_STATUS_DEFN int *
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# endif
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# else /* Don't use misc. */
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# define __WAIT_INT(status) (status)
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# define __WAIT_STATUS int *
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# define __WAIT_STATUS_DEFN int *
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# endif /* Use misc. */
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/* This will define all the `__W*' macros. */
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# include <bits/waitstatus.h>
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# define WEXITSTATUS(status) __WEXITSTATUS (__WAIT_INT (status))
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# define WTERMSIG(status) __WTERMSIG (__WAIT_INT (status))
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# define WSTOPSIG(status) __WSTOPSIG (__WAIT_INT (status))
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# define WIFEXITED(status) __WIFEXITED (__WAIT_INT (status))
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# define WIFSIGNALED(status) __WIFSIGNALED (__WAIT_INT (status))
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# define WIFSTOPPED(status) __WIFSTOPPED (__WAIT_INT (status))
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# ifdef __WIFCONTINUED
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# define WIFCONTINUED(status) __WIFCONTINUED (__WAIT_INT (status))
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# endif
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#endif /* <stdlib.h> not included. */
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#ifdef __USE_MISC
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# define WCOREFLAG __WCOREFLAG
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# define WCOREDUMP(status) __WCOREDUMP (__WAIT_INT (status))
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# define W_EXITCODE(ret, sig) __W_EXITCODE (ret, sig)
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# define W_STOPCODE(sig) __W_STOPCODE (sig)
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#endif
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/* Wait for a child to die. When one does, put its status in *STAT_LOC
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and return its process ID. For errors, return (pid_t) -1.
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This function is a cancellation point and therefore not marked with
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__THROW. */
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extern __pid_t wait (__WAIT_STATUS __stat_loc);
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#ifdef __USE_MISC
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/* Special values for the PID argument to `waitpid' and `wait4'. */
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# define WAIT_ANY (-1) /* Any process. */
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# define WAIT_MYPGRP 0 /* Any process in my process group. */
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#endif
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/* Wait for a child matching PID to die.
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If PID is greater than 0, match any process whose process ID is PID.
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If PID is (pid_t) -1, match any process.
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If PID is (pid_t) 0, match any process with the
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same process group as the current process.
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If PID is less than -1, match any process whose
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process group is the absolute value of PID.
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If the WNOHANG bit is set in OPTIONS, and that child
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is not already dead, return (pid_t) 0. If successful,
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return PID and store the dead child's status in STAT_LOC.
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Return (pid_t) -1 for errors. If the WUNTRACED bit is
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set in OPTIONS, return status for stopped children; otherwise don't.
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This function is a cancellation point and therefore not marked with
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__THROW. */
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extern __pid_t waitpid (__pid_t __pid, int *__stat_loc, int __options);
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#if defined __USE_XOPEN || defined __USE_XOPEN2K8
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# ifndef __id_t_defined
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# include <bits/types.h>
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typedef __id_t id_t;
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# define __id_t_defined
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# endif
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# define __need_siginfo_t
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# include <bits/siginfo.h>
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/* Wait for a childing matching IDTYPE and ID to change the status and
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place appropriate information in *INFOP.
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If IDTYPE is P_PID, match any process whose process ID is ID.
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If IDTYPE is P_PGID, match any process whose process group is ID.
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If IDTYPE is P_ALL, match any process.
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If the WNOHANG bit is set in OPTIONS, and that child
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is not already dead, clear *INFOP and return 0. If successful, store
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exit code and status in *INFOP.
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This function is a cancellation point and therefore not marked with
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__THROW. */
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extern int waitid (idtype_t __idtype, __id_t __id, siginfo_t *__infop,
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int __options);
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#endif
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#if defined __USE_MISC || defined __USE_XOPEN_EXTENDED
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/* This being here makes the prototypes valid whether or not
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we have already included <sys/resource.h> to define `struct rusage'. */
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struct rusage;
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/* Wait for a child to exit. When one does, put its status in *STAT_LOC and
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return its process ID. For errors return (pid_t) -1. If USAGE is not
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nil, store information about the child's resource usage there. If the
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WUNTRACED bit is set in OPTIONS, return status for stopped children;
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otherwise don't. */
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extern __pid_t wait3 (__WAIT_STATUS __stat_loc, int __options,
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struct rusage * __usage) __THROWNL;
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#endif
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#ifdef __USE_MISC
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/* PID is like waitpid. Other args are like wait3. */
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extern __pid_t wait4 (__pid_t __pid, __WAIT_STATUS __stat_loc, int __options,
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struct rusage *__usage) __THROWNL;
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#endif /* Use misc. */
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__END_DECLS
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#endif /* sys/wait.h */
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