usr.bin/window/wwspawn.c

   1 /*
   2  * Copyright (c) 1983, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Edward Wang at The University of California, Berkeley.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  * @(#)wwspawn.c        8.1 (Berkeley) 6/6/93
  37  * $FreeBSD: src/usr.bin/window/wwspawn.c,v 1.4.2.1 2001/05/17 09:45:02 obrien Exp $
  38  * $DragonFly: src/usr.bin/window/wwspawn.c,v 1.2 2003/06/17 04:29:34 dillon Exp $
  39  */
  40
  41 #include <signal.h>
  42 #include <unistd.h>
  43
  44 #include "ww.h"
  45
  46 /*
  47  * There is a dead lock with vfork and closing of pseudo-ports.
  48  * So we have to be sneaky about error reporting.
  49  */
  50 wwspawn(wp, file, argv)
  51 register struct ww *wp;
  52 char *file;
  53 char **argv;
  54 {
  55         int pid;
  56         int ret;
  57         char erred = 0;
  58         int s;
  59
  60         s = sigblock(sigmask(SIGCHLD));
  61         switch (pid = vfork()) {
  62         case -1:
  63                 wwerrno = WWE_SYS;
  64                 ret = -1;
  65                 break;
  66         case 0:
  67                 if (wwenviron(wp) >= 0)
  68                         execvp(file, argv);
  69                 erred = 1;
  70                 _exit(1);
  71         default:
  72                 if (erred) {
  73                         wwerrno = WWE_SYS;
  74                         ret = -1;
  75                 } else {
  76                         wp->ww_pid = pid;
  77                         wp->ww_state = WWS_HASPROC;
  78                         ret = pid;
  79                 }
  80         }
  81         (void) sigsetmask(s);
  82         if (wp->ww_socket >= 0) {
  83                 (void) close(wp->ww_socket);
  84                 wp->ww_socket = -1;
  85         }
  86         return ret;
  87 }