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/sys/wait.h

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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. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *      This product includes software developed by the University of
   16  *      California, Berkeley and its contributors.
   17  * 4. Neither the name of the University nor the names of its contributors
   18  *    may be used to endorse or promote products derived from this software
   19  *    without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  *
   33  *      @(#)wait.h      8.2 (Berkeley) 7/10/94
   34  * $FreeBSD: src/sys/sys/wait.h,v 1.11 1999/12/29 04:24:50 peter Exp $
   35  */
   36 
   37 #ifndef _SYS_WAIT_H_
   38 #define _SYS_WAIT_H_
   39 
   40 /*
   41  * This file holds definitions relevant to the wait4 system call
   42  * and the alternate interfaces that use it (wait, wait3, waitpid).
   43  */
   44 
   45 /*
   46  * Macros to test the exit status returned by wait
   47  * and extract the relevant values.
   48  */
   49 #ifdef _POSIX_SOURCE
   50 #define _W_INT(i)       (i)
   51 #else
   52 #define _W_INT(w)       (*(int *)&(w))  /* convert union wait to int */
   53 #define WCOREFLAG       0200
   54 #endif
   55 
   56 #define _WSTATUS(x)     (_W_INT(x) & 0177)
   57 #define _WSTOPPED       0177            /* _WSTATUS if process is stopped */
   58 #define WIFSTOPPED(x)   (_WSTATUS(x) == _WSTOPPED)
   59 #define WSTOPSIG(x)     (_W_INT(x) >> 8)
   60 #define WIFSIGNALED(x)  (_WSTATUS(x) != _WSTOPPED && _WSTATUS(x) != 0)
   61 #define WTERMSIG(x)     (_WSTATUS(x))
   62 #define WIFEXITED(x)    (_WSTATUS(x) == 0)
   63 #define WEXITSTATUS(x)  (_W_INT(x) >> 8)
   64 #define WIFCONTINUED(x) (x == 19)       /* 19 == SIGCONT */
   65 #ifndef _POSIX_SOURCE
   66 #define WCOREDUMP(x)    (_W_INT(x) & WCOREFLAG)
   67 
   68 #define W_EXITCODE(ret, sig)    ((ret) << 8 | (sig))
   69 #define W_STOPCODE(sig)         ((sig) << 8 | _WSTOPPED)
   70 #endif
   71 
   72 /*
   73  * Option bits for the third argument of wait4.  WNOHANG causes the
   74  * wait to not hang if there are no stopped or terminated processes, rather
   75  * returning an error indication in this case (pid==0).  WUNTRACED
   76  * indicates that the caller should receive status about untraced children
   77  * which stop due to signals.  If children are stopped and a wait without
   78  * this option is done, it is as though they were still running... nothing
   79  * about them is returned.
   80  */
   81 #define WNOHANG         1       /* don't hang in wait */
   82 #define WUNTRACED       2       /* tell about stopped, untraced children */
   83 #define WCONTINUED      4       /* Report a job control continued process. */
   84 #define WLINUXCLONE     0x80000000       /* wait for kthread spawned from linux_clone */
   85 
   86 #ifndef _POSIX_SOURCE
   87 /* POSIX extensions and 4.2/4.3 compatibility: */
   88 
   89 /*
   90  * Tokens for special values of the "pid" parameter to wait4.
   91  */
   92 #define WAIT_ANY        (-1)    /* any process */
   93 #define WAIT_MYPGRP     0       /* any process in my process group */
   94 
   95 #include <machine/endian.h>
   96 
   97 /*
   98  * Deprecated:
   99  * Structure of the information in the status word returned by wait4.
  100  * If w_stopval==WSTOPPED, then the second structure describes
  101  * the information returned, else the first.
  102  */
  103 union wait {
  104         int     w_status;               /* used in syscall */
  105         /*
  106          * Terminated process status.
  107          */
  108         struct {
  109 #if _BYTE_ORDER == _LITTLE_ENDIAN
  110                 unsigned int    w_Termsig:7,    /* termination signal */
  111                                 w_Coredump:1,   /* core dump indicator */
  112                                 w_Retcode:8,    /* exit code if w_termsig==0 */
  113                                 w_Filler:16;    /* upper bits filler */
  114 #elif _BYTE_ORDER == _BIG_ENDIAN
  115                 unsigned int    w_Filler:16,    /* upper bits filler */
  116                                 w_Retcode:8,    /* exit code if w_termsig==0 */
  117                                 w_Coredump:1,   /* core dump indicator */
  118                                 w_Termsig:7;    /* termination signal */
  119 #else
  120 #error "Byte order not implemented"
  121 #endif
  122         } w_T;
  123         /*
  124          * Stopped process status.  Returned
  125          * only for traced children unless requested
  126          * with the WUNTRACED option bit.
  127          */
  128         struct {
  129 #if _BYTE_ORDER == _LITTLE_ENDIAN
  130                 unsigned int    w_Stopval:8,    /* == W_STOPPED if stopped */
  131                                 w_Stopsig:8,    /* signal that stopped us */
  132                                 w_Filler:16;    /* upper bits filler */
  133 #elif _BYTE_ORDER == _BIG_ENDIAN
  134                 unsigned int    w_Filler:16,    /* upper bits filler */
  135                                 w_Stopsig:8,    /* signal that stopped us */
  136                                 w_Stopval:8;    /* == W_STOPPED if stopped */
  137 #else
  138 #error "Byte order not implemented"
  139 #endif
  140         } w_S;
  141 };
  142 #define w_termsig       w_T.w_Termsig
  143 #define w_coredump      w_T.w_Coredump
  144 #define w_retcode       w_T.w_Retcode
  145 #define w_stopval       w_S.w_Stopval
  146 #define w_stopsig       w_S.w_Stopsig
  147 
  148 #define WSTOPPED        _WSTOPPED
  149 #endif /* _POSIX_SOURCE */
  150 
  151 #if !defined(_KERNEL) || defined(_KERNEL_VIRTUAL)
  152 #ifndef _SYS_TYPES_H_
  153 #include <sys/types.h>
  154 #endif
  155 #ifndef _SYS_CDEFS_H_
  156 #include <sys/cdefs.h>
  157 #endif
  158 
  159 __BEGIN_DECLS
  160 struct rusage;  /* forward declaration */
  161 
  162 pid_t   wait (int *);
  163 pid_t   waitpid (pid_t, int *, int);
  164 #ifndef _POSIX_SOURCE
  165 pid_t   wait3 (int *, int, struct rusage *);
  166 pid_t   wait4 (pid_t, int *, int, struct rusage *);
  167 #endif
  168 __END_DECLS
  169 #endif
  170 
  171 #endif

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