lib/libutil/login_tty.c

   1 /*-
   2  * Copyright (c) 1990, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#)login_tty.c      8.1 (Berkeley) 6/4/93
  30  * $FreeBSD: src/lib/libutil/login_tty.c,v 1.6 1999/08/28 00:05:49 peter Exp $
  31  * $DragonFly: src/lib/libutil/login_tty.c,v 1.5 2007/12/30 13:44:33 matthias Exp $
  32  */
  33
  34 #include <sys/param.h>
  35 #include <sys/ioctl.h>
  36
  37 #include <stdlib.h>
  38 #include <unistd.h>
  39
  40 #include "libutil.h"
  41
  42 int
  43 login_tty(int fd)
  44 {
  45         (void) setsid();
  46         if (ioctl(fd, TIOCSCTTY, NULL) == -1)
  47                 return (-1);
  48         (void) dup2(fd, 0);
  49         (void) dup2(fd, 1);
  50         (void) dup2(fd, 2);
  51         if (fd > 2)
  52                 (void) close(fd);
  53         return (0);
  54 }