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wait.h
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wait.h
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/*
* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. The rights granted to you under the License
* may not be used to create, or enable the creation or redistribution of,
* unlawful or unlicensed copies of an Apple operating system, or to
* circumvent, violate, or enable the circumvention or violation of, any
* terms of an Apple operating system software license agreement.
*
* Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
/*
* 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
*/
#ifndef _SYS_WAIT_H_
#define _SYS_WAIT_H_
#include <sys/cdefs.h>
#include <sys/_types.h>
/*
* This file holds definitions relevent to the wait4 system call
* and the alternate interfaces that use it (wait, wait3, waitpid).
*/
/*
* [XSI] The type idtype_t shall be defined as an enumeration type whose
* possible values shall include at least P_ALL, P_PID, and P_PGID.
*/
typedef enum {
P_ALL,
P_PID,
P_PGID
} idtype_t;
/*
* [XSI] The id_t and pid_t types shall be defined as described
* in <sys/types.h>
*/
#include <sys/_types/_pid_t.h>
#include <sys/_types/_id_t.h>
/*
* [XSI] The siginfo_t type shall be defined as described in <signal.h>
* [XSI] The rusage structure shall be defined as described in <sys/resource.h>
* [XSI] Inclusion of the <sys/wait.h> header may also make visible all
* symbols from <signal.h> and <sys/resource.h>
*
* NOTE: This requirement is currently being satisfied by the direct
* inclusion of <sys/signal.h> and <sys/resource.h>, below.
*
* Software should not depend on the exposure of anything other
* than the types siginfo_t and struct rusage as a result of
* this inclusion. If you depend on any types or manifest
* values othe than siginfo_t and struct rusage from either of
* those files, you should explicitly include them yourself, as
* well, or in future releases your stware may not compile
* without modification.
*/
#include <sys/signal.h> /* [XSI] for siginfo_t */
#include <sys/resource.h> /* [XSI] for struct rusage */
/*
* 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 0x00000001 /* [XSI] no hang in wait/no child to reap */
#define WUNTRACED 0x00000002 /* [XSI] notify on stop, untraced child */
/*
* Macros to test the exit status returned by wait
* and extract the relevant values.
*/
#if defined(_POSIX_C_SOURCE) && !defined(_DARWIN_C_SOURCE)
#define _W_INT(i) (i)
#else
#define _W_INT(w) (*(int *)&(w)) /* convert union wait to int */
#define WCOREFLAG 0200
#endif /* (_POSIX_C_SOURCE && !_DARWIN_C_SOURCE) */
/* These macros are permited, as they are in the implementation namespace */
#define _WSTATUS(x) (_W_INT(x) & 0177)
#define _WSTOPPED 0177 /* _WSTATUS if process is stopped */
/*
* [XSI] The <sys/wait.h> header shall define the following macros for
* analysis of process status values
*/
#if __DARWIN_UNIX03
#define WEXITSTATUS(x) ((_W_INT(x) >> 8) & 0x000000ff)
#else /* !__DARWIN_UNIX03 */
#define WEXITSTATUS(x) (_W_INT(x) >> 8)
#endif /* !__DARWIN_UNIX03 */
/* 0x13 == SIGCONT */
#define WSTOPSIG(x) (_W_INT(x) >> 8)
#define WIFCONTINUED(x) (_WSTATUS(x) == _WSTOPPED && WSTOPSIG(x) == 0x13)
#define WIFSTOPPED(x) (_WSTATUS(x) == _WSTOPPED && WSTOPSIG(x) != 0x13)
#define WIFEXITED(x) (_WSTATUS(x) == 0)
#define WIFSIGNALED(x) (_WSTATUS(x) != _WSTOPPED && _WSTATUS(x) != 0)
#define WTERMSIG(x) (_WSTATUS(x))
#if (!defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE))
#define WCOREDUMP(x) (_W_INT(x) & WCOREFLAG)
#define W_EXITCODE(ret, sig) ((ret) << 8 | (sig))
#define W_STOPCODE(sig) ((sig) << 8 | _WSTOPPED)
#endif /* (!defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)) */
/*
* [XSI] The following symbolic constants shall be defined as possible
* values for the fourth argument to waitid().
*/
/* WNOHANG already defined for wait4() */
/* WUNTRACED defined for wait4() but not for waitid() */
#define WEXITED 0x00000004 /* [XSI] Processes which have exitted */
#if __DARWIN_UNIX03
/* waitid() parameter */
#define WSTOPPED 0x00000008 /* [XSI] Any child stopped by signal */
#endif
#define WCONTINUED 0x00000010 /* [XSI] Any child stopped then continued */
#define WNOWAIT 0x00000020 /* [XSI] Leave process returned waitable */
#if (!defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE))
/* POSIX extensions and 4.2/4.3 compatability: */
/*
* 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 __DARWIN_BYTE_ORDER == __DARWIN_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 __DARWIN_BYTE_ORDER == __DARWIN_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 __DARWIN_BYTE_ORDER == __DARWIN_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 __DARWIN_BYTE_ORDER == __DARWIN_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
#endif /* (!defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)) */
#if !(__DARWIN_UNIX03 - 0)
/*
* Stopped state value; cannot use waitid() parameter of the same name
* in the same scope
*/
#define WSTOPPED _WSTOPPED
#endif /* !__DARWIN_UNIX03 */
#ifndef KERNEL
__BEGIN_DECLS
pid_t wait(int *) __DARWIN_ALIAS_C(wait);
pid_t waitpid(pid_t, int *, int) __DARWIN_ALIAS_C(waitpid);
#ifndef _ANSI_SOURCE
int waitid(idtype_t, id_t, siginfo_t *, int) __DARWIN_ALIAS_C(waitid);
#endif /* !_ANSI_SOURCE */
#if (!defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE))
pid_t wait3(int *, int, struct rusage *);
pid_t wait4(pid_t, int *, int, struct rusage *);
#endif /* (!defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)) */
__END_DECLS
#endif
#endif /* !_SYS_WAIT_H_ */