usr/src/ucb/window/wwenviron.c

/*
 * Copyright (c) 1983 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#ifndef lint
static char sccsid[] = "@(#)wwenviron.c 3.20 (Berkeley) 6/29/88";
#endif /* not lint */

#include "ww.h"
#include <sys/signal.h>

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

        if ((i = open("/dev/tty", 0)) < 0)
                goto bad;
        if (ioctl(i, TIOCNOTTY, (char *)0) < 0)
                goto bad;
        (void) close(i);
        if ((i = wp->ww_socket) < 0 && (i = open(wp->ww_ttyname, 2)) < 0)
                goto bad;
        (void) dup2(i, 0);
        (void) dup2(i, 1);
        (void) dup2(i, 2);
        for (i = wwdtablesize - 1; i > 2; i--)
                (void) close(i);
        (void) ioctl(0, TIOCSPGRP, (char *)&pgrp);
        (void) setpgrp(pgrp, pgrp);
        /* SIGPIPE is the only one we ignore */
        (void) signal(SIGPIPE, SIG_DFL);
        (void) sigsetmask(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:%s",
                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;
}