usr.bin/window/wwenviron.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  * @(#)wwenviron.c      8.1 (Berkeley) 6/6/93
  37  * $FreeBSD: src/usr.bin/window/wwenviron.c,v 1.2.6.1 2001/05/17 09:45:01 obrien Exp $
  38  * $DragonFly: src/usr.bin/window/wwenviron.c,v 1.3 2006/01/12 13:43:11 corecode Exp $
  39  */
  40
  41 #include "ww.h"
  42 #if !defined(OLD_TTY) && !defined(TIOCSCTTY) && !defined(TIOCNOTTY)
  43 #include <sys/ioctl.h>
  44 #endif
  45 #include <signal.h>
  46
  47 /*
  48  * Set up the environment of this process to run in window 'wp'.
  49  */
  50 wwenviron(wp)
  51 register struct ww *wp;
  52 {
  53         register i;
  54 #ifndef TIOCSCTTY
  55         int pgrp = getpid();
  56 #endif
  57         char buf[1024];
  58
  59 #ifndef TIOCSCTTY
  60         if ((i = open("/dev/tty", 0)) < 0)
  61                 goto bad;
  62         if (ioctl(i, TIOCNOTTY, (char *)0) < 0)
  63                 goto bad;
  64         (void) close(i);
  65 #endif
  66         if ((i = wp->ww_socket) < 0) {
  67                 if ((i = open(wp->ww_ttyname, 2)) < 0)
  68                         goto bad;
  69                 if (wwsettty(i, &wwwintty) < 0)
  70                         goto bad;
  71                 if (wwsetttysize(i, wp->ww_w.nr, wp->ww_w.nc) < 0)
  72                         goto bad;
  73         }
  74         (void) dup2(i, 0);
  75         (void) dup2(i, 1);
  76         (void) dup2(i, 2);
  77         (void) close(i);
  78 #ifdef TIOCSCTTY
  79         (void) setsid();
  80         (void) ioctl(0, TIOCSCTTY, 0);
  81 #else
  82         (void) ioctl(0, TIOCSPGRP, (char *)&pgrp);
  83         (void) setpgrp(pgrp, pgrp);
  84 #endif
  85         /* SIGPIPE is the only one we ignore */
  86         (void) signal(SIGPIPE, SIG_DFL);
  87         (void) sigsetmask(0);
  88         /*
  89          * Two conditions that make destructive setenv ok:
  90          * 1. setenv() copies the string,
  91          * 2. we've already called tgetent which copies the termcap entry.
  92          */
  93         (void) sprintf(buf, "%sco#%d:li#%d:%s",
  94                 WWT_TERMCAP, wp->ww_w.nc, wp->ww_w.nr, wwwintermcap);
  95         if (setenv("TERMCAP", buf, 1) == -1)
  96                 err(1, "setenv: cannot set TERMCAP=%s", buf);
  97         (void) sprintf(buf, "%d", wp->ww_id + 1);
  98         if (setenv("WINDOW_ID", buf, 1) == -1)
  99                 err(1, "setenv: cannot set WINDOW_ID=%s", buf);
 100         return 0;
 101 bad:
 102         wwerrno = WWE_SYS;
 103         return -1;
 104 }