use close-on-exec

[unix-history] / usr / src / usr.bin / window / wwenviron.c

/*
* Copyright (c) 1983 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.
*
* %sccs.include.redist.c%
*/

#ifndef lint
static char sccsid[] = "@(#)wwenviron.c 3.28 (Berkeley) %G%";
#endif /* not lint */

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

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

#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) setpgrp(pgrp, pgrp);
#endif
       /* 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;
}