usr.bin/window/wwchild.c

   1 /*      @(#)wwchild.c   8.1 (Berkeley) 6/6/93   */
   2 /*      $NetBSD: wwchild.c,v 1.8 2006/12/18 20:04:55 christos Exp $     */
   3
   4 /*
   5  * Copyright (c) 1983, 1993
   6  *      The Regents of the University of California.  All rights reserved.
   7  *
   8  * This code is derived from software contributed to Berkeley by
   9  * Edward Wang at The University of California, Berkeley.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include <sys/types.h>
  37 #include <sys/wait.h>
  38 #include <errno.h>
  39 #include "ww.h"
  40
  41 void
  42 wwchild(int dummy __unused)
  43 {
  44         int olderrno;
  45         struct ww **wp;
  46         int status;
  47         int pid;
  48         char collected = 0;
  49
  50         olderrno = errno;
  51         while ((pid =
  52             wait3(&status, WNOHANG|WUNTRACED, (struct rusage *)0)) > 0) {
  53                 for (wp = wwindex; wp < &wwindex[NWW]; wp++) {
  54                         if (*wp && (*wp)->ww_state == WWS_HASPROC
  55                             && (*wp)->ww_pid == pid) {
  56                                 (*wp)->ww_state = WWS_DEAD;
  57                                 collected = 1;
  58                                 break;
  59                         }
  60                 }
  61         }
  62         errno = olderrno;
  63         /* jump out of wwiomux when somebody dies */
  64         if (collected)
  65                 wwsetintr();
  66 }