usr.bin/window/wwspawn.c

   1 /*      $NetBSD: wwspawn.c,v 1.10 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[] = "@(#)wwspawn.c   8.1 (Berkeley) 6/6/93";
  39 #else
  40 __RCSID("$NetBSD: wwspawn.c,v 1.10 2006/12/18 20:04:55 christos Exp $");
  41 #endif
  42 #endif /* not lint */
  43
  44 #include <signal.h>
  45 #include <unistd.h>
  46 #include "ww.h"
  47
  48 /*
  49  * There is a dead lock with vfork and closing of pseudo-ports.
  50  * So we have to be sneaky about error reporting.
  51  */
  52 int
  53 wwspawn(struct ww *wp, char *file, char **argv)
  54 {
  55         int pid;
  56         int ret;
  57         char volatile erred;
  58         sigset_t nsigset, osigset;
  59
  60         erred = 0;
  61
  62         sigemptyset(&nsigset);
  63         sigaddset(&nsigset, SIGCHLD);
  64         sigprocmask(SIG_BLOCK, &nsigset, &osigset);
  65
  66         switch (pid = vfork()) {
  67         case -1:
  68                 wwerrno = WWE_SYS;
  69                 ret = -1;
  70                 break;
  71         case 0:
  72                 if (wwenviron(wp) >= 0)
  73                         execvp(file, argv);
  74                 erred = 1;
  75                 _exit(1);
  76         default:
  77                 if (erred) {
  78                         wwerrno = WWE_SYS;
  79                         ret = -1;
  80                 } else {
  81                         wp->ww_pid = pid;
  82                         wp->ww_state = WWS_HASPROC;
  83                         ret = pid;
  84                 }
  85         }
  86
  87         sigprocmask(SIG_SETMASK, &osigset, (sigset_t *)0);
  88
  89         if (wp->ww_socket >= 0) {
  90                 (void) close(wp->ww_socket);
  91                 wp->ww_socket = -1;
  92         }
  93         return ret;
  94 }