usr.bin/window/wwenviron.c

   1 /*      @(#)wwenviron.c 8.1 (Berkeley) 6/6/93   */
   2 /*      $NetBSD: wwenviron.c,v 1.9 2003/08/07 11:17:39 agc Exp $        */
   3
   4 /*
   5  * Copyright (c) 1983, 1993
   6  *      The Regents of the University of California.  All rights reserved.
   7  *
   8  * This code is derived from software contributed to Berkeley by
   9  * Edward Wang at The University of California, Berkeley.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include <sys/types.h>
  37 #if !defined(OLD_TTY) && !defined(TIOCSCTTY) && !defined(TIOCNOTTY)
  38 #include <sys/ioctl.h>
  39 #endif
  40 #include <fcntl.h>
  41 #include <signal.h>
  42 #include <stdio.h>
  43 #include <stdlib.h>
  44 #include <unistd.h>
  45 #include "ww.h"
  46
  47 /*
  48  * Set up the environment of this process to run in window 'wp'.
  49  */
  50 int
  51 wwenviron(struct ww *wp)
  52 {
  53         int i;
  54 #ifndef TIOCSCTTY
  55         int pgrp = getpid();
  56 #endif
  57         char buf[1024];
  58         sigset_t nsigset;
  59
  60 #ifndef TIOCSCTTY
  61         if ((i = open("/dev/tty", 0)) < 0)
  62                 goto bad;
  63         if (ioctl(i, TIOCNOTTY, (char *)0) < 0)
  64                 goto bad;
  65         (void) close(i);
  66 #endif
  67         if ((i = wp->ww_socket) < 0) {
  68                 if ((i = open(wp->ww_ttyname, 2)) < 0)
  69                         goto bad;
  70                 if (wwsettty(i, &wwwintty) < 0)
  71                         goto bad;
  72                 if (wwsetttysize(i, wp->ww_w.nr, wp->ww_w.nc) < 0)
  73                         goto bad;
  74         }
  75         (void) dup2(i, 0);
  76         (void) dup2(i, 1);
  77         (void) dup2(i, 2);
  78         (void) close(i);
  79 #ifdef TIOCSCTTY
  80         (void) setsid();
  81         (void) ioctl(0, TIOCSCTTY, 0);
  82 #else
  83         (void) ioctl(0, TIOCSPGRP, (char *)&pgrp);
  84         (void) setpgid(pgrp, pgrp);
  85 #endif
  86         /* SIGPIPE is the only one we ignore */
  87         (void) signal(SIGPIPE, SIG_DFL);
  88         sigemptyset(&nsigset);
  89         sigprocmask(SIG_SETMASK, &nsigset, (sigset_t *)0);
  90         /*
  91          * Two conditions that make destructive setenv ok:
  92          * 1. setenv() copies the string,
  93          * 2. we've already called tgetent which copies the termcap entry.
  94          */
  95         (void) sprintf(buf, "%sco#%d:li#%d:%.800s",
  96                 WWT_TERMCAP, wp->ww_w.nc, wp->ww_w.nr, wwwintermcap);
  97         (void) setenv("TERMCAP", buf, 1);
  98         (void) sprintf(buf, "%d", wp->ww_id + 1);
  99         (void) setenv("WINDOW_ID", buf, 1);
 100         return 0;
 101 bad:
 102         wwerrno = WWE_SYS;
 103         return -1;
 104 }