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   1 /*
   2  * Copyright (c) 1982, 1986, 1989, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  *      @(#)wait.h      8.2 (Berkeley) 7/10/94
  30  */
  32 #ifndef _SYS_WAIT_H_
  33 #define _SYS_WAIT_H_
  35 /*
  36  * This file holds definitions relevent to the wait4 system call
  37  * and the alternate interfaces that use it (wait, wait3, waitpid).
  38  */
  40 /*
  41  * Macros to test the exit status returned by wait
  42  * and extract the relevant values.
  43  */
  44 #ifdef _POSIX_SOURCE
  45 #define _W_INT(i)       (i)
  46 #else
  47 #define _W_INT(w)       (*(int *)&(w))  /* convert union wait to int */
  48 #define WCOREFLAG       0200
  49 #endif
  51 #define _WSTATUS(x)     (_W_INT(x) & 0177)
  52 #define _WSTOPPED       0177            /* _WSTATUS if process is stopped */
  53 #define WIFSTOPPED(x)   (_WSTATUS(x) == _WSTOPPED)
  54 #define WSTOPSIG(x)     (_W_INT(x) >> 8)
  55 #define WIFSIGNALED(x)  (_WSTATUS(x) != _WSTOPPED && _WSTATUS(x) != 0)
  56 #define WTERMSIG(x)     (_WSTATUS(x))
  57 #define WIFEXITED(x)    (_WSTATUS(x) == 0)
  58 #define WEXITSTATUS(x)  (_W_INT(x) >> 8)
  59 #ifndef _POSIX_SOURCE
  60 #define WCOREDUMP(x)    (_W_INT(x) & WCOREFLAG)
  62 #define W_EXITCODE(ret, sig)    ((ret) << 8 | (sig))
  63 #define W_STOPCODE(sig)         ((sig) << 8 | _WSTOPPED)
  64 #endif
  66 /*
  67  * Option bits for the third argument of wait4.  WNOHANG causes the
  68  * wait to not hang if there are no stopped or terminated processes, rather
  69  * returning an error indication in this case (pid==0).  WUNTRACED
  70  * indicates that the caller should receive status about untraced children
  71  * which stop due to signals.  If children are stopped and a wait without
  72  * this option is done, it is as though they were still running... nothing
  73  * about them is returned.
  74  */
  75 #define WNOHANG         1       /* don't hang in wait */
  76 #define WUNTRACED       2       /* tell about stopped, untraced children */
  78 #ifndef _POSIX_SOURCE
  79 /* POSIX extensions and 4.2/4.3 compatability: */
  81 /*
  82  * Tokens for special values of the "pid" parameter to wait4.
  83  */
  84 #define WAIT_ANY        (-1)    /* any process */
  85 #define WAIT_MYPGRP     0       /* any process in my process group */
  87 #include <sys/endian.h>
  89 /*
  90  * Deprecated:
  91  * Structure of the information in the status word returned by wait4.
  92  * If w_stopval==WSTOPPED, then the second structure describes
  93  * the information returned, else the first.
  94  */
  95 union wait {
  96         int     w_status;               /* used in syscall */
  97         /*
  98          * Terminated process status.
  99          */
 100         struct {
 101 #if BYTE_ORDER == LITTLE_ENDIAN
 102                 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 */
 106 #endif
 107 #if BYTE_ORDER == BIG_ENDIAN
 108                 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 */
 112 #endif
 113         } w_T;
 114         /*
 115          * Stopped process status.  Returned
 116          * only for traced children unless requested
 117          * with the WUNTRACED option bit.
 118          */
 119         struct {
 120 #if BYTE_ORDER == LITTLE_ENDIAN
 121                 unsigned int    w_Stopval:8,    /* == W_STOPPED if stopped */
w_Stopsig:8,    /* signal that stopped us */
w_Filler:16;    /* upper bits filler */
 124 #endif
 125 #if BYTE_ORDER == BIG_ENDIAN
 126                 unsigned int    w_Filler:16,    /* upper bits filler */
w_Stopsig:8,    /* signal that stopped us */
w_Stopval:8;    /* == W_STOPPED if stopped */
 129 #endif
 130         } w_S;
 131 };
 132 #define w_termsig       w_T.w_Termsig
 133 #define w_coredump      w_T.w_Coredump
 134 #define w_retcode       w_T.w_Retcode
 135 #define w_stopval       w_S.w_Stopval
 136 #define w_stopsig       w_S.w_Stopsig
 138 #define WSTOPPED        _WSTOPPED
 139 #endif /* _POSIX_SOURCE */
 141 #ifndef KERNEL
 142 #include <sys/types.h>
 143 #include <sys/cdefs.h>
__BEGIN_DECLS
pid_t   wait(int *);
pid_t   waitpid(pid_t, int *, int);
__END_DECLS
 149 #endif
 151 #endif /* !_SYS_WAIT_H_ */