window/wwspawn.c

   1 /*      $NetBSD: wwspawn.c,v 1.6 1998/04/17 15:56:14 cgd 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. All advertising materials mentioning features or use of this software
  19  *    must display the following acknowledgement:
  20  *      This product includes software developed by the University of
  21  *      California, Berkeley and its contributors.
  22  * 4. Neither the name of the University nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  */
  38
  39 #include <sys/cdefs.h>
  40 #ifndef lint
  41 #if 0
  42 static char sccsid[] = "@(#)wwspawn.c   8.1 (Berkeley) 6/6/93";
  43 #else
  44 __RCSID("$NetBSD: wwspawn.c,v 1.6 1998/04/17 15:56:14 cgd Exp $");
  45 #endif
  46 #endif /* not lint */
  47
  48 #include <signal.h>
  49 #include <unistd.h>
  50 #include "ww.h"
  51
  52 /*
  53  * There is a dead lock with vfork and closing of pseudo-ports.
  54  * So we have to be sneaky about error reporting.
  55  */
  56 int
  57 wwspawn(wp, file, argv)
  58         struct ww *wp;
  59         char *file;
  60         char **argv;
  61 {
  62         int pid;
  63         int ret;
  64         char erred = 0;
  65         sigset_t sigset, osigset;
  66
  67 #ifdef __GNUC__ /* XXX variable `erred ' might be clobbered by ... `vfork' */
  68         (void)&erred;
  69 #endif
  70
  71         sigemptyset(&sigset);
  72         sigaddset(&sigset, SIGCHLD);
  73         sigprocmask(SIG_BLOCK, &sigset, &osigset);
  74
  75         switch (pid = vfork()) {
  76         case -1:
  77                 wwerrno = WWE_SYS;
  78                 ret = -1;
  79                 break;
  80         case 0:
  81                 if (wwenviron(wp) >= 0)
  82                         execvp(file, argv);
  83                 erred = 1;
  84                 _exit(1);
  85         default:
  86                 if (erred) {
  87                         wwerrno = WWE_SYS;
  88                         ret = -1;
  89                 } else {
  90                         wp->ww_pid = pid;
  91                         wp->ww_state = WWS_HASPROC;
  92                         ret = pid;
  93                 }
  94         }
  95
  96         sigprocmask(SIG_SETMASK, &osigset, (sigset_t *)0);
  97
  98         if (wp->ww_socket >= 0) {
  99                 (void) close(wp->ww_socket);
 100                 wp->ww_socket = -1;
 101         }
 102         return ret;
 103 }