window/wwenviron.c

   1 /*      $NetBSD: wwenviron.c,v 1.5 1997/11/21 08:37:18 lukem 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[] = "@(#)wwenviron.c 8.1 (Berkeley) 6/6/93";
  43 #else
  44 __RCSID("$NetBSD: wwenviron.c,v 1.5 1997/11/21 08:37:18 lukem Exp $");
  45 #endif
  46 #endif /* not lint */
  47
  48 #include <sys/types.h>
  49 #if !defined(OLD_TTY) && !defined(TIOCSCTTY) && !defined(TIOCNOTTY)
  50 #include <sys/ioctl.h>
  51 #endif
  52 #include <fcntl.h>
  53 #include <signal.h>
  54 #include <stdio.h>
  55 #include <stdlib.h>
  56 #include <unistd.h>
  57 #include "ww.h"
  58
  59 /*
  60  * Set up the environment of this process to run in window 'wp'.
  61  */
  62 int
  63 wwenviron(wp)
  64         struct ww *wp;
  65 {
  66         int i;
  67 #ifndef TIOCSCTTY
  68         int pgrp = getpid();
  69 #endif
  70         char buf[1024];
  71         sigset_t sigset;
  72
  73 #ifndef TIOCSCTTY
  74         if ((i = open("/dev/tty", 0)) < 0)
  75                 goto bad;
  76         if (ioctl(i, TIOCNOTTY, (char *)0) < 0)
  77                 goto bad;
  78         (void) close(i);
  79 #endif
  80         if ((i = wp->ww_socket) < 0) {
  81                 if ((i = open(wp->ww_ttyname, 2)) < 0)
  82                         goto bad;
  83                 if (wwsettty(i, &wwwintty) < 0)
  84                         goto bad;
  85                 if (wwsetttysize(i, wp->ww_w.nr, wp->ww_w.nc) < 0)
  86                         goto bad;
  87         }
  88         (void) dup2(i, 0);
  89         (void) dup2(i, 1);
  90         (void) dup2(i, 2);
  91         (void) close(i);
  92 #ifdef TIOCSCTTY
  93         (void) setsid();
  94         (void) ioctl(0, TIOCSCTTY, 0);
  95 #else
  96         (void) ioctl(0, TIOCSPGRP, (char *)&pgrp);
  97         (void) setpgrp(pgrp, pgrp);
  98 #endif
  99         /* SIGPIPE is the only one we ignore */
 100         (void) signal(SIGPIPE, SIG_DFL);
 101         sigemptyset(&sigset);
 102         sigprocmask(SIG_SETMASK, &sigset, (sigset_t *)0);
 103         /*
 104          * Two conditions that make destructive setenv ok:
 105          * 1. setenv() copies the string,
 106          * 2. we've already called tgetent which copies the termcap entry.
 107          */
 108         (void) sprintf(buf, "%sco#%d:li#%d:%s",
 109                 WWT_TERMCAP, wp->ww_w.nc, wp->ww_w.nr, wwwintermcap);
 110         (void) setenv("TERMCAP", buf, 1);
 111         (void) sprintf(buf, "%d", wp->ww_id + 1);
 112         (void) setenv("WINDOW_ID", buf, 1);
 113         return 0;
 114 bad:
 115         wwerrno = WWE_SYS;
 116         return -1;
 117 }