FreeBSD/Linux Kernel Cross Reference
sys/bsd/sys/wait.h

     /*
      * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
      *
      * @APPLE_LICENSE_HEADER_START@
      * 
      * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
      * 
      * 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. 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_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_
    
    /*
     * 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 /* _POSIX_SOURCE */
    
    #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)
    #if !defined(_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 /* !defined(_POSIX_SOURCE) */
    
    /*
     * 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 */
   
   #if !defined(_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 /* !defined(_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));
   #if  !defined(_POSIX_SOURCE)
   pid_t   wait3 __P((int *, int, struct rusage *));
   pid_t   wait4 __P((pid_t, int *, int, struct rusage *));
   #endif /* !defined(_POSIX_SOURCE) */
   __END_DECLS
   #endif
   #endif /* !_SYS_WAIT_H_ */

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