Preview: wait.h
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//usr/include/sys/wait.h
/* Copyright (C) 1991-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
/*
* POSIX Standard: 3.2.1 Wait for Process Termination <sys/wait.h>
*/
#ifndef _SYS_WAIT_H
#define _SYS_WAIT_H 1
#include <features.h>
__BEGIN_DECLS
#include <bits/types.h>
#ifndef __pid_t_defined
typedef __pid_t pid_t;
# define __pid_t_defined
#endif
#if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8
# include <signal.h>
#endif
#if defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K8
/* Some older standards require the contents of struct rusage to be
defined here. */
# include <bits/types/struct_rusage.h>
#endif
/* These macros could also be defined in <stdlib.h>. */
#if !defined _STDLIB_H || (!defined __USE_XOPEN && !defined __USE_XOPEN2K8)
/* This will define the `W*' macros for the flag
bits to `waitpid', `wait3', and `wait4'. */
# include <bits/waitflags.h>
/* This will define all the `__W*' macros. */
# include <bits/waitstatus.h>
# define WEXITSTATUS(status) __WEXITSTATUS (status)
# define WTERMSIG(status) __WTERMSIG (status)
# define WSTOPSIG(status) __WSTOPSIG (status)
# define WIFEXITED(status) __WIFEXITED (status)
# define WIFSIGNALED(status) __WIFSIGNALED (status)
# define WIFSTOPPED(status) __WIFSTOPPED (status)
# ifdef __WIFCONTINUED
# define WIFCONTINUED(status) __WIFCONTINUED (status)
# endif
#endif /* <stdlib.h> not included. */
#ifdef __USE_MISC
# define WCOREFLAG __WCOREFLAG
# define WCOREDUMP(status) __WCOREDUMP (status)
# define W_EXITCODE(ret, sig) __W_EXITCODE (ret, sig)
# define W_STOPCODE(sig) __W_STOPCODE (sig)
#endif
/* The following values are used by the `waitid' function. */
#if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8
typedef enum
{
P_ALL, /* Wait for any child. */
P_PID, /* Wait for specified process. */
P_PGID /* Wait for members of process group. */
} idtype_t;
#endif
/* Wait for a child to die. When one does, put its status in *STAT_LOC
and return its process ID. For errors, return (pid_t) -1.
This function is a cancellation point and therefore not marked with
__THROW. */
extern __pid_t wait (int *__stat_loc);
#ifdef __USE_MISC
/* Special values for the PID argument to `waitpid' and `wait4'. */
# define WAIT_ANY (-1) /* Any process. */
# define WAIT_MYPGRP 0 /* Any process in my process group. */
#endif
/* Wait for a child matching PID to die.
If PID is greater than 0, match any process whose process ID is PID.
If PID is (pid_t) -1, match any process.
If PID is (pid_t) 0, match any process with the
same process group as the current process.
If PID is less than -1, match any process whose
process group is the absolute value of PID.
If the WNOHANG bit is set in OPTIONS, and that child
is not already dead, return (pid_t) 0. If successful,
return PID and store the dead child's status in STAT_LOC.
Return (pid_t) -1 for errors. If the WUNTRACED bit is
set in OPTIONS, return status for stopped children; otherwise don't.
This function is a cancellation point and therefore not marked with
__THROW. */
extern __pid_t waitpid (__pid_t __pid, int *__stat_loc, int __options);
#if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8
# ifndef __id_t_defined
typedef __id_t id_t;
# define __id_t_defined
# endif
# include <bits/types/siginfo_t.h>
/* Wait for a childing matching IDTYPE and ID to change the status and
place appropriate information in *INFOP.
If IDTYPE is P_PID, match any process whose process ID is ID.
If IDTYPE is P_PGID, match any process whose process group is ID.
If IDTYPE is P_ALL, match any process.
If the WNOHANG bit is set in OPTIONS, and that child
is not already dead, clear *INFOP and return 0. If successful, store
exit code and status in *INFOP.
This function is a cancellation point and therefore not marked with
__THROW. */
extern int waitid (idtype_t __idtype, __id_t __id, siginfo_t *__infop,
int __options);
#endif
#if defined __USE_MISC \
|| (defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K)
/* This being here makes the prototypes valid whether or not
we have already included <sys/resource.h> to define `struct rusage'. */
struct rusage;
/* Wait for a child to exit. When one does, put its status in *STAT_LOC and
return its process ID. For errors return (pid_t) -1. If USAGE is not
nil, store information about the child's resource usage there. If the
WUNTRACED bit is set in OPTIONS, return status for stopped children;
otherwise don't. */
# ifndef __USE_TIME_BITS64
extern __pid_t wait3 (int *__stat_loc, int __options,
struct rusage * __usage) __THROWNL;
# else
# ifdef __REDIRECT_NTHNL
extern __pid_t __REDIRECT_NTHNL (wait3, (int *__stat_loc, int __options,
struct rusage * __usage),
__wait3_time64);
# else
# define wait3 __wait3_time64
# endif
# endif
#endif
#ifdef __USE_MISC
# ifndef __USE_TIME_BITS64
/* PID is like waitpid. Other args are like wait3. */
extern __pid_t wait4 (__pid_t __pid, int *__stat_loc, int __options,
struct rusage *__usage) __THROWNL;
# else
# ifdef __REDIRECT_NTHNL
extern __pid_t __REDIRECT_NTHNL (wait4, (__pid_t __pid, int *__stat_loc,
int __options, struct rusage *__usage),
__wait4_time64);
# else
# define wait4 __wait4_time64
# endif
# endif
#endif /* Use misc. */
__END_DECLS
#endif /* sys/wait.h */
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