Replace all casts of NULL to something with NULL.
[dragonfly.git] / lib / libutil / login_tty.c
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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.
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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.
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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 $
faedbd2a 31 * $DragonFly: src/lib/libutil/login_tty.c,v 1.5 2007/12/30 13:44:33 matthias Exp $
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32 */
33
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34#include <sys/param.h>
35#include <sys/ioctl.h>
36
984263bc 37#include <stdlib.h>
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38#include <unistd.h>
39
40#include "libutil.h"
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41
42int
1588fa1f 43login_tty(int fd)
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44{
45 (void) setsid();
2038fb68 46 if (ioctl(fd, TIOCSCTTY, NULL) == -1)
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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}