The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*
    2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
    3  *
    4  * @APPLE_LICENSE_HEADER_START@
    5  * 
    6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
    7  * 
    8  * This file contains Original Code and/or Modifications of Original Code
    9  * as defined in and that are subject to the Apple Public Source License
   10  * Version 2.0 (the 'License'). You may not use this file except in
   11  * compliance with the License. Please obtain a copy of the License at
   12  * http://www.opensource.apple.com/apsl/ and read it before using this
   13  * file.
   14  * 
   15  * The Original Code and all software distributed under the License are
   16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
   17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
   18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
   19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
   20  * Please see the License for the specific language governing rights and
   21  * limitations under the License.
   22  * 
   23  * @APPLE_LICENSE_HEADER_END@
   24  */
   25 /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
   26 /*
   27  * Copyright (c) 1982, 1986, 1989, 1993, 1994
   28  *      The Regents of the University of California.  All rights reserved.
   29  *
   30  * Redistribution and use in source and binary forms, with or without
   31  * modification, are permitted provided that the following conditions
   32  * are met:
   33  * 1. Redistributions of source code must retain the above copyright
   34  *    notice, this list of conditions and the following disclaimer.
   35  * 2. Redistributions in binary form must reproduce the above copyright
   36  *    notice, this list of conditions and the following disclaimer in the
   37  *    documentation and/or other materials provided with the distribution.
   38  * 3. All advertising materials mentioning features or use of this software
   39  *    must display the following acknowledgement:
   40  *      This product includes software developed by the University of
   41  *      California, Berkeley and its contributors.
   42  * 4. Neither the name of the University nor the names of its contributors
   43  *    may be used to endorse or promote products derived from this software
   44  *    without specific prior written permission.
   45  *
   46  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   47  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   48  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   49  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   50  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   51  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   52  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   53  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   54  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   55  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   56  * SUCH DAMAGE.
   57  *
   58  *      @(#)wait.h      8.2 (Berkeley) 7/10/94
   59  */
   60  
   61 #ifndef _SYS_WAIT_H_
   62 #define _SYS_WAIT_H_
   63 
   64 /*
   65  * This file holds definitions relevent to the wait4 system call
   66  * and the alternate interfaces that use it (wait, wait3, waitpid).
   67  */
   68 
   69 /*
   70  * Macros to test the exit status returned by wait
   71  * and extract the relevant values.
   72  */
   73 #ifdef _POSIX_SOURCE
   74 #define _W_INT(i)       (i)
   75 #else
   76 #define _W_INT(w)       (*(int *)&(w))  /* convert union wait to int */
   77 #define WCOREFLAG       0200
   78 
   79 #endif /* _POSIX_SOURCE */
   80 
   81 #define _WSTATUS(x)     (_W_INT(x) & 0177)
   82 #define _WSTOPPED       0177            /* _WSTATUS if process is stopped */
   83 #define WIFSTOPPED(x)   (_WSTATUS(x) == _WSTOPPED)
   84 #define WSTOPSIG(x)     (_W_INT(x) >> 8)
   85 #define WIFSIGNALED(x)  (_WSTATUS(x) != _WSTOPPED && _WSTATUS(x) != 0)
   86 #define WTERMSIG(x)     (_WSTATUS(x))
   87 #define WIFEXITED(x)    (_WSTATUS(x) == 0)
   88 #define WEXITSTATUS(x)  (_W_INT(x) >> 8)
   89 #if !defined(_POSIX_SOURCE)
   90 #define WCOREDUMP(x)    (_W_INT(x) & WCOREFLAG)
   91 
   92 #define W_EXITCODE(ret, sig)    ((ret) << 8 | (sig))
   93 #define W_STOPCODE(sig)         ((sig) << 8 | _WSTOPPED)
   94 #endif /* !defined(_POSIX_SOURCE) */
   95 
   96 /*
   97  * Option bits for the third argument of wait4.  WNOHANG causes the
   98  * wait to not hang if there are no stopped or terminated processes, rather
   99  * returning an error indication in this case (pid==0).  WUNTRACED
  100  * indicates that the caller should receive status about untraced children
  101  * which stop due to signals.  If children are stopped and a wait without
  102  * this option is done, it is as though they were still running... nothing
  103  * about them is returned.
  104  */
  105 #define WNOHANG         1       /* don't hang in wait */
  106 #define WUNTRACED       2       /* tell about stopped, untraced children */
  107 
  108 #if !defined(_POSIX_SOURCE)
  109 /* POSIX extensions and 4.2/4.3 compatability: */
  110 
  111 /*
  112  * Tokens for special values of the "pid" parameter to wait4.
  113  */
  114 #define WAIT_ANY        (-1)    /* any process */
  115 #define WAIT_MYPGRP     0       /* any process in my process group */
  116 
  117 #include <machine/endian.h>
  118 
  119 /*
  120  * Deprecated:
  121  * Structure of the information in the status word returned by wait4.
  122  * If w_stopval==WSTOPPED, then the second structure describes
  123  * the information returned, else the first.
  124  */
  125 union wait {
  126         int     w_status;               /* used in syscall */
  127         /*
  128          * Terminated process status.
  129          */
  130         struct {
  131 #if BYTE_ORDER == LITTLE_ENDIAN 
  132                 unsigned int    w_Termsig:7,    /* termination signal */
  133                                 w_Coredump:1,   /* core dump indicator */
  134                                 w_Retcode:8,    /* exit code if w_termsig==0 */
  135                                 w_Filler:16;    /* upper bits filler */
  136 #endif
  137 #if BYTE_ORDER == BIG_ENDIAN 
  138                 unsigned int    w_Filler:16,    /* upper bits filler */
  139                                 w_Retcode:8,    /* exit code if w_termsig==0 */
  140                                 w_Coredump:1,   /* core dump indicator */
  141                                 w_Termsig:7;    /* termination signal */
  142 #endif
  143         } w_T;
  144         /*
  145          * Stopped process status.  Returned
  146          * only for traced children unless requested
  147          * with the WUNTRACED option bit.
  148          */
  149         struct {
  150 #if BYTE_ORDER == LITTLE_ENDIAN 
  151                 unsigned int    w_Stopval:8,    /* == W_STOPPED if stopped */
  152                                 w_Stopsig:8,    /* signal that stopped us */
  153                                 w_Filler:16;    /* upper bits filler */
  154 #endif
  155 #if BYTE_ORDER == BIG_ENDIAN 
  156                 unsigned int    w_Filler:16,    /* upper bits filler */
  157                                 w_Stopsig:8,    /* signal that stopped us */
  158                                 w_Stopval:8;    /* == W_STOPPED if stopped */
  159 #endif
  160         } w_S;
  161 };
  162 #define w_termsig       w_T.w_Termsig
  163 #define w_coredump      w_T.w_Coredump
  164 #define w_retcode       w_T.w_Retcode
  165 #define w_stopval       w_S.w_Stopval
  166 #define w_stopsig       w_S.w_Stopsig
  167 
  168 #define WSTOPPED        _WSTOPPED
  169 #endif /* !defined(_POSIX_SOURCE) */
  170 
  171 #ifndef KERNEL
  172 #include <sys/types.h>
  173 #include <sys/cdefs.h>
  174 
  175 __BEGIN_DECLS
  176 struct rusage;  /* forward declaration */
  177 
  178 pid_t   wait __P((int *));
  179 pid_t   waitpid __P((pid_t, int *, int));
  180 #if  !defined(_POSIX_SOURCE)
  181 pid_t   wait3 __P((int *, int, struct rusage *));
  182 pid_t   wait4 __P((pid_t, int *, int, struct rusage *));
  183 #endif /* !defined(_POSIX_SOURCE) */
  184 __END_DECLS
  185 #endif
  186 #endif /* !_SYS_WAIT_H_ */

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