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  * 4. 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  * $FreeBSD: src/sys/sys/wait.h,v 1.20.2.1 2005/04/21 22:19:22 ps Exp $
   31  */
   32 
   33 #ifndef _SYS_WAIT_H_
   34 #define _SYS_WAIT_H_
   35 
   36 #include <sys/cdefs.h>
   37 
   38 /*
   39  * This file holds definitions relevant to the wait4 system call and the
   40  * alternate interfaces that use it (wait, wait3, waitpid).
   41  */
   42 
   43 /*
   44  * Macros to test the exit status returned by wait and extract the relevant
   45  * values.
   46  */
   47 #if __BSD_VISIBLE
   48 #define _W_INT(w)       (*(int *)&(w))  /* Convert union wait to int. */
   49 #define WCOREFLAG       0200
   50 #else
   51 #define _W_INT(i)       (i)
   52 #endif
   53 
   54 #define _WSTATUS(x)     (_W_INT(x) & 0177)
   55 #define _WSTOPPED       0177            /* _WSTATUS if process is stopped */
   56 #define WIFSTOPPED(x)   (_WSTATUS(x) == _WSTOPPED)
   57 #define WSTOPSIG(x)     (_W_INT(x) >> 8)
   58 #define WIFSIGNALED(x)  (_WSTATUS(x) != _WSTOPPED && _WSTATUS(x) != 0)
   59 #define WTERMSIG(x)     (_WSTATUS(x))
   60 #define WIFEXITED(x)    (_WSTATUS(x) == 0)
   61 #define WEXITSTATUS(x)  (_W_INT(x) >> 8)
   62 #define WIFCONTINUED(x) (x == 0x13)     /* 0x13 == SIGCONT */
   63 #if __BSD_VISIBLE
   64 #define WCOREDUMP(x)    (_W_INT(x) & WCOREFLAG)
   65 
   66 #define W_EXITCODE(ret, sig)    ((ret) << 8 | (sig))
   67 #define W_STOPCODE(sig)         ((sig) << 8 | _WSTOPPED)
   68 #endif
   69 
   70 /*
   71  * Option bits for the third argument of wait4.  WNOHANG causes the
   72  * wait to not hang if there are no stopped or terminated processes, rather
   73  * returning an error indication in this case (pid==0).  WUNTRACED
   74  * indicates that the caller should receive status about untraced children
   75  * which stop due to signals.  If children are stopped and a wait without
   76  * this option is done, it is as though they were still running... nothing
   77  * about them is returned.
   78  */
   79 #define WNOHANG         1       /* Don't hang in wait. */
   80 #define WUNTRACED       2       /* Tell about stopped, untraced children. */
   81 #define WCONTINUED      4       /* Report a job control continued process. */
   82 
   83 #if __BSD_VISIBLE
   84 #define WLINUXCLONE 0x80000000  /* Wait for kthread spawned from linux_clone. */
   85 #endif
   86 
   87 /*
   88  * Tokens for special values of the "pid" parameter to wait4.
   89  */
   90 #if __BSD_VISIBLE
   91 #define WAIT_ANY        (-1)    /* any process */
   92 #define WAIT_MYPGRP     0       /* any process in my process group */
   93 #endif /* __BSD_VISIBLE */
   94 
   95 #ifndef _KERNEL
   96 #include <sys/types.h>
   97 
   98 __BEGIN_DECLS
   99 pid_t   wait(int *);
  100 pid_t   waitpid(pid_t, int *, int);
  101 #if __BSD_VISIBLE
  102 struct rusage;
  103 pid_t   wait3(int *, int, struct rusage *);
  104 pid_t   wait4(pid_t, int *, int, struct rusage *);
  105 #endif
  106 __END_DECLS
  107 #endif /* !_KERNEL */
  108 
  109 #endif /* !_SYS_WAIT_H_ */

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