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    1: /*      $OpenBSD: wait.h,v 1.14 2006/04/27 02:17:21 tedu Exp $       */
    2: /*      $NetBSD: wait.h,v 1.11 1996/04/09 20:55:51 cgd Exp $ */
    3: 
    4: /*
    5:  * Copyright (c) 1982, 1986, 1989, 1993, 1994
    6:  *      The Regents of the University of California.  All rights reserved.
    7:  *
    8:  * Redistribution and use in source and binary forms, with or without
    9:  * modification, are permitted provided that the following conditions
   10:  * are met:
   11:  * 1. Redistributions of source code must retain the above copyright
   12:  *    notice, this list of conditions and the following disclaimer.
   13:  * 2. Redistributions in binary form must reproduce the above copyright
   14:  *    notice, this list of conditions and the following disclaimer in the
   15:  *    documentation and/or other materials provided with the distribution.
   16:  * 3. Neither the name of the University nor the names of its contributors
   17:  *    may be used to endorse or promote products derived from this software
   18:  *    without specific prior written permission.
   19:  *
   20:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   21:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   24:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30:  * SUCH DAMAGE.
   31:  *
   32:  *      @(#)wait.h   8.2 (Berkeley) 7/10/94
   33:  */
   34: 
   35: #ifndef _SYS_WAIT_H_
   36: #define _SYS_WAIT_H_
   37: 
   38: #include <sys/cdefs.h>
   39: 
   40: /*
   41:  * This file holds definitions relevent 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: #if __BSD_VISIBLE
   50: #define _W_INT(w)       (*(int *)&(w))        /* convert union wait to int */
   51: #else
   52: #define _W_INT(i)       (i)
   53: #endif
   54: 
   55: #define _WSTATUS(x)     (_W_INT(x) & 0177)
   56: #define _WSTOPPED       0177          /* _WSTATUS if process is stopped */
   57: #define _WCONTINUED     0177777             /* process has continued */
   58: #define WIFSTOPPED(x)   ((_W_INT(x) & 0xff) == _WSTOPPED)
   59: #define WSTOPSIG(x)     (int)(((unsigned)_W_INT(x) >> 8) & 0xff)
   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)  (int)(((unsigned)_W_INT(x) >> 8) & 0xff)
   64: #define WIFCONTINUED(x) ((_W_INT(x) & _WCONTINUED) == _WCONTINUED)
   65: #if __XPG_VISIBLE
   66: #define WCOREFLAG       0200
   67: #define WCOREDUMP(x)    (_W_INT(x) & WCOREFLAG)
   68: 
   69: #define W_EXITCODE(ret, sig)    ((ret) << 8 | (sig))
   70: #define W_STOPCODE(sig)         ((sig) << 8 | _WSTOPPED)
   71: #endif
   72: 
   73: /*
   74:  * Option bits for the third argument of wait4.  WNOHANG causes the
   75:  * wait to not hang if there are no stopped or terminated processes, rather
   76:  * returning an error indication in this case (pid==0).  WUNTRACED
   77:  * indicates that the caller should receive status about untraced children
   78:  * which stop due to signals.  If children are stopped and a wait without
   79:  * this option is done, it is as though they were still running... nothing
   80:  * about them is returned.
   81:  */
   82: #define WNOHANG         1      /* don't hang in wait */
   83: #define WUNTRACED       2     /* tell about stopped, untraced children */
   84: #if __XPG_VISIBLE
   85: #define WALTSIG         4      /* wait for child with alternate exit signal */
   86: #endif
   87: #define WCONTINUED      8    /* report a job control continued process */
   88: 
   89: #if __BSD_VISIBLE
   90: /*
   91:  * Tokens for special values of the "pid" parameter to wait4.
   92:  */
   93: #define WAIT_ANY        (-1)   /* any process */
   94: #define WAIT_MYPGRP     0   /* any process in my process group */
   95: 
   96: #include <sys/types.h>
   97: 
   98: /*
   99:  * Deprecated:
  100:  * Structure of the information in the status word returned by wait4.
  101:  * If w_stopval==WSTOPPED, then the second structure describes
  102:  * the information returned, else the first.
  103:  */
  104: union wait {
  105:         int    w_status;          /* used in syscall */
  106:         /*
  107:          * Terminated process status.
  108:          */
  109:         struct {
  110: #if _BYTE_ORDER == _LITTLE_ENDIAN
  111:                 unsigned int  w_Termsig:7,     /* termination signal */
  112:                                 w_Coredump:1,       /* core dump indicator */
  113:                                 w_Retcode:8,        /* exit code if w_termsig==0 */
  114:                                 w_Filler:16;        /* upper bits filler */
  115: #endif
  116: #if _BYTE_ORDER == _BIG_ENDIAN
  117:                 unsigned int  w_Filler:16,     /* upper bits filler */
  118:                                 w_Retcode:8,        /* exit code if w_termsig==0 */
  119:                                 w_Coredump:1,       /* core dump indicator */
  120:                                 w_Termsig:7;        /* termination signal */
  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: #endif
  134: #if _BYTE_ORDER == _BIG_ENDIAN
  135:                 unsigned int  w_Filler:16,     /* upper bits filler */
  136:                                 w_Stopsig:8,        /* signal that stopped us */
  137:                                 w_Stopval:8;        /* == W_STOPPED if stopped */
  138: #endif
  139:         } w_S;
  140: };
  141: #define w_termsig       w_T.w_Termsig
  142: #define w_coredump      w_T.w_Coredump
  143: #define w_retcode       w_T.w_Retcode
  144: #define w_stopval       w_S.w_Stopval
  145: #define w_stopsig       w_S.w_Stopsig
  146: 
  147: #define WSTOPPED        _WSTOPPED
  148: #endif /* __BSD_VISIBLE */
  149: 
  150: #ifndef _KERNEL
  151: #include <sys/types.h>
  152: 
  153: __BEGIN_DECLS
  154: struct rusage;  /* forward declaration */
  155: 
  156: pid_t   wait(int *);
  157: pid_t   waitpid(pid_t, int *, int);
  158: #if __BSD_VISIBLE
  159: pid_t   wait3(int *, int, struct rusage *);
  160: pid_t   wait4(pid_t, int *, int, struct rusage *);
  161: #endif
  162: __END_DECLS
  163: #endif
  164: 
  165: #endif /* !_SYS_WAIT_H_ */