usr.bin/window/wwenviron.c

   1 /*      $NetBSD: wwenviron.c,v 1.9 2003/08/07 11:17:39 agc 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[] = "@(#)wwenviron.c 8.1 (Berkeley) 6/6/93";
  39 #else
  40 __RCSID("$NetBSD: wwenviron.c,v 1.9 2003/08/07 11:17:39 agc Exp $");
  41 #endif
  42 #endif /* not lint */
  43
  44 #include <sys/types.h>
  45 #if !defined(OLD_TTY) && !defined(TIOCSCTTY) && !defined(TIOCNOTTY)
  46 #include <sys/ioctl.h>
  47 #endif
  48 #include <fcntl.h>
  49 #include <signal.h>
  50 #include <stdio.h>
  51 #include <stdlib.h>
  52 #include <unistd.h>
  53 #include "ww.h"
  54
  55 /*
  56  * Set up the environment of this process to run in window 'wp'.
  57  */
  58 int
  59 wwenviron(struct ww *wp)
  60 {
  61         int i;
  62 #ifndef TIOCSCTTY
  63         int pgrp = getpid();
  64 #endif
  65         char buf[1024];
  66         sigset_t nsigset;
  67
  68 #ifndef TIOCSCTTY
  69         if ((i = open("/dev/tty", 0)) < 0)
  70                 goto bad;
  71         if (ioctl(i, TIOCNOTTY, (char *)0) < 0)
  72                 goto bad;
  73         (void) close(i);
  74 #endif
  75         if ((i = wp->ww_socket) < 0) {
  76                 if ((i = open(wp->ww_ttyname, 2)) < 0)
  77                         goto bad;
  78                 if (wwsettty(i, &wwwintty) < 0)
  79                         goto bad;
  80                 if (wwsetttysize(i, wp->ww_w.nr, wp->ww_w.nc) < 0)
  81                         goto bad;
  82         }
  83         (void) dup2(i, 0);
  84         (void) dup2(i, 1);
  85         (void) dup2(i, 2);
  86         (void) close(i);
  87 #ifdef TIOCSCTTY
  88         (void) setsid();
  89         (void) ioctl(0, TIOCSCTTY, 0);
  90 #else
  91         (void) ioctl(0, TIOCSPGRP, (char *)&pgrp);
  92         (void) setpgid(pgrp, pgrp);
  93 #endif
  94         /* SIGPIPE is the only one we ignore */
  95         (void) signal(SIGPIPE, SIG_DFL);
  96         sigemptyset(&nsigset);
  97         sigprocmask(SIG_SETMASK, &nsigset, (sigset_t *)0);
  98         /*
  99          * Two conditions that make destructive setenv ok:
 100          * 1. setenv() copies the string,
 101          * 2. we've already called tgetent which copies the termcap entry.
 102          */
 103         (void) sprintf(buf, "%sco#%d:li#%d:%s",
 104                 WWT_TERMCAP, wp->ww_w.nc, wp->ww_w.nr, wwwintermcap);
 105         (void) setenv("TERMCAP", buf, 1);
 106         (void) sprintf(buf, "%d", wp->ww_id + 1);
 107         (void) setenv("WINDOW_ID", buf, 1);
 108         return 0;
 109 bad:
 110         wwerrno = WWE_SYS;
 111         return -1;
 112 }