usr.bin/window/wwspawn.c

   1 /*      @(#)wwspawn.c   8.1 (Berkeley) 6/6/93   */
   2 /*      $NetBSD: wwspawn.c,v 1.10 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 <signal.h>
  37 #include <unistd.h>
  38 #include "ww.h"
  39
  40 /*
  41  * There is a dead lock with vfork and closing of pseudo-ports.
  42  * So we have to be sneaky about error reporting.
  43  */
  44 int
  45 wwspawn(struct ww *wp, char *file, char **argv)
  46 {
  47         int pid;
  48         int ret;
  49         char volatile erred;
  50         sigset_t nsigset, osigset;
  51
  52         erred = 0;
  53
  54         sigemptyset(&nsigset);
  55         sigaddset(&nsigset, SIGCHLD);
  56         sigprocmask(SIG_BLOCK, &nsigset, &osigset);
  57
  58         switch (pid = vfork()) {
  59         case -1:
  60                 wwerrno = WWE_SYS;
  61                 ret = -1;
  62                 break;
  63         case 0:
  64                 if (wwenviron(wp) >= 0)
  65                         execvp(file, argv);
  66                 erred = 1;
  67                 _exit(1);
  68         default:
  69                 if (erred) {
  70                         wwerrno = WWE_SYS;
  71                         ret = -1;
  72                 } else {
  73                         wp->ww_pid = pid;
  74                         wp->ww_state = WWS_HASPROC;
  75                         ret = pid;
  76                 }
  77         }
  78
  79         sigprocmask(SIG_SETMASK, &osigset, (sigset_t *)0);
  80
  81         if (wp->ww_socket >= 0) {
  82                 (void) close(wp->ww_socket);
  83                 wp->ww_socket = -1;
  84         }
  85         return ret;
  86 }