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wait.h
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wait.h
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/*
* Copyright (c) 1982, 1986, 1989, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)wait.h 8.2 (Berkeley) 7/10/94
* $Id: wait.h,v 1.8.4.1 1999/03/02 00:42:09 julian Exp $
*/
#ifndef _SYS_WAIT_H_
#define _SYS_WAIT_H_
/*
* This file holds definitions relevant to the wait4 system call
* and the alternate interfaces that use it (wait, wait3, waitpid).
*/
/*
* Macros to test the exit status returned by wait
* and extract the relevant values.
*/
#ifdef _POSIX_SOURCE
#define _W_INT(i) (i)
#else
#define _W_INT(w) (*(int *)&(w)) /* convert union wait to int */
#define WCOREFLAG 0200
#endif
#define _WSTATUS(x) (_W_INT(x) & 0177)
#define _WSTOPPED 0177 /* _WSTATUS if process is stopped */
#define WIFSTOPPED(x) (_WSTATUS(x) == _WSTOPPED)
#define WSTOPSIG(x) (_W_INT(x) >> 8)
#define WIFSIGNALED(x) (_WSTATUS(x) != _WSTOPPED && _WSTATUS(x) != 0)
#define WTERMSIG(x) (_WSTATUS(x))
#define WIFEXITED(x) (_WSTATUS(x) == 0)
#define WEXITSTATUS(x) (_W_INT(x) >> 8)
#ifndef _POSIX_SOURCE
#define WCOREDUMP(x) (_W_INT(x) & WCOREFLAG)
#define W_EXITCODE(ret, sig) ((ret) << 8 | (sig))
#define W_STOPCODE(sig) ((sig) << 8 | _WSTOPPED)
#endif
/*
* Option bits for the third argument of wait4. WNOHANG causes the
* wait to not hang if there are no stopped or terminated processes, rather
* returning an error indication in this case (pid==0). WUNTRACED
* indicates that the caller should receive status about untraced children
* which stop due to signals. If children are stopped and a wait without
* this option is done, it is as though they were still running... nothing
* about them is returned.
*/
#define WNOHANG 1 /* don't hang in wait */
#define WUNTRACED 2 /* tell about stopped, untraced children */
#define WLINUXCLONE 0x80000000 /* wait for kthread spawned from linux_clone */
#ifndef _POSIX_SOURCE
/* POSIX extensions and 4.2/4.3 compatibility: */
/*
* Tokens for special values of the "pid" parameter to wait4.
*/
#define WAIT_ANY (-1) /* any process */
#define WAIT_MYPGRP 0 /* any process in my process group */
#include <machine/endian.h>
/*
* Deprecated:
* Structure of the information in the status word returned by wait4.
* If w_stopval==WSTOPPED, then the second structure describes
* the information returned, else the first.
*/
union wait {
int w_status; /* used in syscall */
/*
* Terminated process status.
*/
struct {
#if BYTE_ORDER == LITTLE_ENDIAN
unsigned int w_Termsig:7, /* termination signal */
w_Coredump:1, /* core dump indicator */
w_Retcode:8, /* exit code if w_termsig==0 */
w_Filler:16; /* upper bits filler */
#endif
#if BYTE_ORDER == BIG_ENDIAN
unsigned int w_Filler:16, /* upper bits filler */
w_Retcode:8, /* exit code if w_termsig==0 */
w_Coredump:1, /* core dump indicator */
w_Termsig:7; /* termination signal */
#endif
} w_T;
/*
* Stopped process status. Returned
* only for traced children unless requested
* with the WUNTRACED option bit.
*/
struct {
#if BYTE_ORDER == LITTLE_ENDIAN
unsigned int w_Stopval:8, /* == W_STOPPED if stopped */
w_Stopsig:8, /* signal that stopped us */
w_Filler:16; /* upper bits filler */
#endif
#if BYTE_ORDER == BIG_ENDIAN
unsigned int w_Filler:16, /* upper bits filler */
w_Stopsig:8, /* signal that stopped us */
w_Stopval:8; /* == W_STOPPED if stopped */
#endif
} w_S;
};
#define w_termsig w_T.w_Termsig
#define w_coredump w_T.w_Coredump
#define w_retcode w_T.w_Retcode
#define w_stopval w_S.w_Stopval
#define w_stopsig w_S.w_Stopsig
#define WSTOPPED _WSTOPPED
#endif /* _POSIX_SOURCE */
#ifndef KERNEL
#include <sys/types.h>
#include <sys/cdefs.h>
__BEGIN_DECLS
struct rusage; /* forward declaration */
pid_t wait __P((int *));
pid_t waitpid __P((pid_t, int *, int));
#ifndef _POSIX_SOURCE
pid_t wait3 __P((int *, int, struct rusage *));
pid_t wait4 __P((pid_t, int *, int, struct rusage *));
#endif
__END_DECLS
#endif
#endif