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 1.17 2002/06/05 02:21:01 mike Exp $
   35  */
   36 
   37 #ifndef _SYS_WAIT_H_
   38 #define _SYS_WAIT_H_
   39 
   40 #include <sys/cdefs.h>
   41 
   42 /*
   43  * This file holds definitions relevant to the wait4 system call and the
   44  * alternate interfaces that use it (wait, wait3, waitpid).
   45  */
   46 
   47 /*
   48  * Macros to test the exit status returned by wait and extract the relevant
   49  * values.
   50  */
   51 #if __BSD_VISIBLE
   52 #define _W_INT(w)       (*(int *)&(w))  /* Convert union wait to int. */
   53 #define WCOREFLAG       0200
   54 #else
   55 #define _W_INT(i)       (i)
   56 #endif
   57 
   58 #define _WSTATUS(x)     (_W_INT(x) & 0177)
   59 #define _WSTOPPED       0177            /* _WSTATUS if process is stopped */
   60 #define WIFSTOPPED(x)   (_WSTATUS(x) == _WSTOPPED)
   61 #define WSTOPSIG(x)     (_W_INT(x) >> 8)
   62 #define WIFSIGNALED(x)  (_WSTATUS(x) != _WSTOPPED && _WSTATUS(x) != 0)
   63 #define WTERMSIG(x)     (_WSTATUS(x))
   64 #define WIFEXITED(x)    (_WSTATUS(x) == 0)
   65 #define WEXITSTATUS(x)  (_W_INT(x) >> 8)
   66 #define WIFCONTINUED(x) (x == 0x13)     /* 0x13 == SIGCONT */
   67 #if __BSD_VISIBLE
   68 #define WCOREDUMP(x)    (_W_INT(x) & WCOREFLAG)
   69 
   70 #define W_EXITCODE(ret, sig)    ((ret) << 8 | (sig))
   71 #define W_STOPCODE(sig)         ((sig) << 8 | _WSTOPPED)
   72 #endif
   73 
   74 /*
   75  * Option bits for the third argument of wait4.  WNOHANG causes the
   76  * wait to not hang if there are no stopped or terminated processes, rather
   77  * returning an error indication in this case (pid==0).  WUNTRACED
   78  * indicates that the caller should receive status about untraced children
   79  * which stop due to signals.  If children are stopped and a wait without
   80  * this option is done, it is as though they were still running... nothing
   81  * about them is returned.
   82  */
   83 #define WNOHANG         1       /* Don't hang in wait. */
   84 #define WUNTRACED       2       /* Tell about stopped, untraced children. */
   85 #define WCONTINUED      4       /* Report a job control continued process. */
   86 
   87 #if __BSD_VISIBLE
   88 #define WLINUXCLONE 0x80000000  /* Wait for kthread spawned from linux_clone. */
   89 #endif
   90 
   91 /*
   92  * Tokens for special values of the "pid" parameter to wait4.
   93  */
   94 #if __BSD_VISIBLE
   95 #define WAIT_ANY        (-1)    /* any process */
   96 #define WAIT_MYPGRP     0       /* any process in my process group */
   97 #endif /* __BSD_VISIBLE */
   98 
   99 #ifndef _KERNEL
  100 #include <sys/types.h>
  101 
  102 __BEGIN_DECLS
  103 struct rusage;  /* forward declaration */
  104 
  105 pid_t   wait(int *);
  106 pid_t   waitpid(pid_t, int *, int);
  107 #if __BSD_VISIBLE
  108 pid_t   wait3(int *, int, struct rusage *);
  109 pid_t   wait4(pid_t, int *, int, struct rusage *);
  110 #endif
  111 __END_DECLS
  112 #endif
  113 
  114 #endif /* !_SYS_WAIT_H_ */

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