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

     /*-
      * Copyright (c) 1982, 1986, 1989, 1993, 1994
      *      The Regents of the University of California.  All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)wait.h      8.2 (Berkeley) 7/10/94
     * $FreeBSD: releng/5.0/sys/sys/wait.h 97851 2002-06-05 02:21:01Z mike $
     */
    
    #ifndef _SYS_WAIT_H_
    #define _SYS_WAIT_H_
    
    #include <sys/cdefs.h>
    
    /*
     * This file holds definitions relevant to the wait4 system call and the
     * alternate interfaces that use it (wait, wait3, waitpid).
     */
    
    /*
     * Macros to test the exit status returned by wait and extract the relevant
     * values.
     */
    #if __BSD_VISIBLE
    #define _W_INT(w)       (*(int *)&(w))  /* Convert union wait to int. */
    #define WCOREFLAG       0200
    #else
    #define _W_INT(i)       (i)
    #endif
    
    #define _WSTATUS(x)     (_W_INT(x) & 0177)
    #define _WSTOPPED       0177            /* _WSTATUS if process is stopped */
    #define WIFSTOPPED(x)   (_WSTATUS(x) == _WSTOPPED)
    #define WSTOPSIG(x)     (_W_INT(x) >> 8)
    #define WIFSIGNALED(x)  (_WSTATUS(x) != _WSTOPPED && _WSTATUS(x) != 0)
    #define WTERMSIG(x)     (_WSTATUS(x))
    #define WIFEXITED(x)    (_WSTATUS(x) == 0)
    #define WEXITSTATUS(x)  (_W_INT(x) >> 8)
    #define WIFCONTINUED(x) (x == 0x13)     /* 0x13 == SIGCONT */
    #if __BSD_VISIBLE
    #define WCOREDUMP(x)    (_W_INT(x) & WCOREFLAG)
    
    #define W_EXITCODE(ret, sig)    ((ret) << 8 | (sig))
    #define W_STOPCODE(sig)         ((sig) << 8 | _WSTOPPED)
    #endif
    
    /*
     * Option bits for the third argument of wait4.  WNOHANG causes the
     * wait to not hang if there are no stopped or terminated processes, rather
     * returning an error indication in this case (pid==0).  WUNTRACED
     * indicates that the caller should receive status about untraced children
     * which stop due to signals.  If children are stopped and a wait without
     * this option is done, it is as though they were still running... nothing
     * about them is returned.
     */
    #define WNOHANG         1       /* Don't hang in wait. */
    #define WUNTRACED       2       /* Tell about stopped, untraced children. */
    #define WCONTINUED      4       /* Report a job control continued process. */
    
    #if __BSD_VISIBLE
    #define WLINUXCLONE 0x80000000  /* Wait for kthread spawned from linux_clone. */
    #endif
    
    /*
     * Tokens for special values of the "pid" parameter to wait4.
     */
    #if __BSD_VISIBLE
    #define WAIT_ANY        (-1)    /* any process */
    #define WAIT_MYPGRP     0       /* any process in my process group */
    #endif /* __BSD_VISIBLE */
    
    #ifndef _KERNEL
   #include <sys/types.h>
   
   __BEGIN_DECLS
   struct rusage;  /* forward declaration */
   
   pid_t   wait(int *);
   pid_t   waitpid(pid_t, int *, int);
   #if __BSD_VISIBLE
   pid_t   wait3(int *, int, struct rusage *);
   pid_t   wait4(pid_t, int *, int, struct rusage *);
   #endif
   __END_DECLS
   #endif
   
   #endif /* !_SYS_WAIT_H_ */

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