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glibc/posix/sys/wait.h
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/* Copyright (C) 1991-1994,1996-2001,2003,2004,2005,2007,2009,2010,2011,2012 | |
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 | |
<http://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 <signal.h> | |
/* 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> | |
# ifdef __USE_BSD | |
/* Lots of hair to allow traditional BSD use of `union wait' | |
as well as POSIX.1 use of `int' for the status word. */ | |
# if defined __GNUC__ && !defined __cplusplus | |
# define __WAIT_INT(status) \ | |
(__extension__ (((union { __typeof(status) __in; int __i; }) \ | |
{ .__in = (status) }).__i)) | |
# else | |
# define __WAIT_INT(status) (*(const int *) &(status)) | |
# endif | |
/* This is the type of the argument to `wait'. The funky union | |
causes redeclarations with either `int *' or `union wait *' to be | |
allowed without complaint. __WAIT_STATUS_DEFN is the type used in | |
the actual function definitions. */ | |
# if !defined __GNUC__ || __GNUC__ < 2 || defined __cplusplus | |
# define __WAIT_STATUS void * | |
# define __WAIT_STATUS_DEFN void * | |
# else | |
/* This works in GCC 2.6.1 and later. */ | |
typedef union | |
{ | |
union wait *__uptr; | |
int *__iptr; | |
} __WAIT_STATUS __attribute__ ((__transparent_union__)); | |
# define __WAIT_STATUS_DEFN int * | |
# endif | |
# else /* Don't use BSD. */ | |
# define __WAIT_INT(status) (status) | |
# define __WAIT_STATUS int * | |
# define __WAIT_STATUS_DEFN int * | |
# endif /* Use BSD. */ | |
/* This will define all the `__W*' macros. */ | |
# include <bits/waitstatus.h> | |
# define WEXITSTATUS(status) __WEXITSTATUS (__WAIT_INT (status)) | |
# define WTERMSIG(status) __WTERMSIG (__WAIT_INT (status)) | |
# define WSTOPSIG(status) __WSTOPSIG (__WAIT_INT (status)) | |
# define WIFEXITED(status) __WIFEXITED (__WAIT_INT (status)) | |
# define WIFSIGNALED(status) __WIFSIGNALED (__WAIT_INT (status)) | |
# define WIFSTOPPED(status) __WIFSTOPPED (__WAIT_INT (status)) | |
# ifdef __WIFCONTINUED | |
# define WIFCONTINUED(status) __WIFCONTINUED (__WAIT_INT (status)) | |
# endif | |
#endif /* <stdlib.h> not included. */ | |
#ifdef __USE_BSD | |
# define WCOREFLAG __WCOREFLAG | |
# define WCOREDUMP(status) __WCOREDUMP (__WAIT_INT (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_SVID || defined __USE_XOPEN || 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 (__WAIT_STATUS __stat_loc); | |
#ifdef __USE_BSD | |
/* 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_SVID || defined __USE_XOPEN || defined __USE_XOPEN2K8 | |
# ifndef __id_t_defined | |
# include <bits/types.h> | |
typedef __id_t id_t; | |
# define __id_t_defined | |
# endif | |
# define __need_siginfo_t | |
# include <bits/siginfo.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_BSD || defined __USE_XOPEN_EXTENDED | |
/* 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. */ | |
extern __pid_t wait3 (__WAIT_STATUS __stat_loc, int __options, | |
struct rusage * __usage) __THROWNL; | |
#endif | |
#ifdef __USE_BSD | |
/* PID is like waitpid. Other args are like wait3. */ | |
extern __pid_t wait4 (__pid_t __pid, __WAIT_STATUS __stat_loc, int __options, | |
struct rusage *__usage) __THROWNL; | |
#endif /* Use BSD. */ | |
__END_DECLS | |
#endif /* sys/wait.h */ |