usr.bin/window/wwchild.c

   1 /*      $NetBSD: wwchild.c,v 1.8 2006/12/18 20:04:55 christos Exp $     */
   2
   3 /*
   4  * Copyright (c) 1983, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Edward Wang at The University of California, Berkeley.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include <sys/cdefs.h>
  36 #ifndef lint
  37 #if 0
  38 static char sccsid[] = "@(#)wwchild.c   8.1 (Berkeley) 6/6/93";
  39 #else
  40 __RCSID("$NetBSD: wwchild.c,v 1.8 2006/12/18 20:04:55 christos Exp $");
  41 #endif
  42 #endif /* not lint */
  43
  44 #include <sys/types.h>
  45 #include <sys/wait.h>
  46 #include <errno.h>
  47 #include "ww.h"
  48
  49 void
  50 wwchild(int dummy __unused)
  51 {
  52         int olderrno;
  53         struct ww **wp;
  54         int status;
  55         int pid;
  56         char collected = 0;
  57
  58         olderrno = errno;
  59         while ((pid =
  60             wait3(&status, WNOHANG|WUNTRACED, (struct rusage *)0)) > 0) {
  61                 for (wp = wwindex; wp < &wwindex[NWW]; wp++) {
  62                         if (*wp && (*wp)->ww_state == WWS_HASPROC
  63                             && (*wp)->ww_pid == pid) {
  64                                 (*wp)->ww_state = WWS_DEAD;
  65                                 collected = 1;
  66                                 break;
  67                         }
  68                 }
  69         }
  70         errno = olderrno;
  71         /* jump out of wwiomux when somebody dies */
  72         if (collected)
  73                 wwsetintr();
  74 }