wait.h
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上传日期:2007-04-14
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- /*
- * Copyright (c) 1982, 1986, 1989, 1993
- * 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 8.1 (Berkeley) 6/2/93
- * $Id$
- */
- #ifndef _SYS_WAIT_H_
- #define _SYS_WAIT_H_
- /*
- * This file holds definitions relevent 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 /* dont hang in wait */
- #define WUNTRACED 2 /* tell about stopped, untraced children */
- #ifndef _POSIX_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 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, void *));
- pid_t wait4 __P_((pid_t, int *, int, void *));
- #endif
- __END_DECLS
- #endif
- #endif