/*      @(#)wwenviron.c 8.1 (Berkeley) 6/6/93   */
/*      $NetBSD: wwenviron.c,v 1.9 2003/08/07 11:17:39 agc Exp $        */

/*
 * Copyright (c) 1983, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Edward Wang at The University of California, Berkeley.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/types.h>
#if !defined(OLD_TTY) && !defined(TIOCSCTTY) && !defined(TIOCNOTTY)
#include <sys/ioctl.h>
#endif
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "ww.h"

/*
 * Set up the environment of this process to run in window 'wp'.
 */
int
wwenviron(struct ww *wp)
{
        int i;
#ifndef TIOCSCTTY
        int pgrp = getpid();
#endif
        char buf[1024];
        sigset_t nsigset;

#ifndef TIOCSCTTY
        if ((i = open("/dev/tty", 0)) < 0)
                goto bad;
        if (ioctl(i, TIOCNOTTY, (char *)0) < 0)
                goto bad;
        (void) close(i);
#endif
        if ((i = wp->ww_socket) < 0) {
                if ((i = open(wp->ww_ttyname, 2)) < 0)
                        goto bad;
                if (wwsettty(i, &wwwintty) < 0)
                        goto bad;
                if (wwsetttysize(i, wp->ww_w.nr, wp->ww_w.nc) < 0)
                        goto bad;
        }
        (void) dup2(i, 0);
        (void) dup2(i, 1);
        (void) dup2(i, 2);
        (void) close(i);
#ifdef TIOCSCTTY
        (void) setsid();
        (void) ioctl(0, TIOCSCTTY, 0);
#else
        (void) ioctl(0, TIOCSPGRP, (char *)&pgrp);
        (void) setpgid(pgrp, pgrp);
#endif
        /* SIGPIPE is the only one we ignore */
        (void) signal(SIGPIPE, SIG_DFL);
        sigemptyset(&nsigset);
        sigprocmask(SIG_SETMASK, &nsigset, (sigset_t *)0);
        /*
         * Two conditions that make destructive setenv ok:
         * 1. setenv() copies the string,
         * 2. we've already called tgetent which copies the termcap entry.
         */
        (void) sprintf(buf, "%sco#%d:li#%d:%.800s",
                WWT_TERMCAP, wp->ww_w.nc, wp->ww_w.nr, wwwintermcap);
        (void) setenv("TERMCAP", buf, 1);
        (void) sprintf(buf, "%d", wp->ww_id + 1);
        (void) setenv("WINDOW_ID", buf, 1);
        return 0;
bad:
        wwerrno = WWE_SYS;
        return -1;
}