1 /* $OpenBSD: tty.c,v 1.5 2003/06/10 22:20:53 deraadt Exp $ */
2 /* $NetBSD: tty.c,v 1.4 1994/12/07 00:46:57 jtc Exp $ */
3
4 /*
5 * Copyright (c) 1988, 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 #ifndef lint
34 static char copyright[] =
35 "@(#) Copyright (c) 1988, 1993\n\
36 The Regents of the University of California. All rights reserved.\n";
37 #endif /* not lint */
38
39 #ifndef lint
40 #if 0
41 static char sccsid[] = "@(#)tty.c 8.1 (Berkeley) 6/6/93";
42 #endif
43 static char rcsid[] = "$OpenBSD: tty.c,v 1.5 2003/06/10 22:20:53 deraadt Exp $";
44 #endif /* not lint */
45
46 #include <stdio.h>
47 #include <stdlib.h>
48 #include <unistd.h>
49
50 static void usage(void);
51
52 int
main(int argc,char * argv[])53 main(int argc, char *argv[])
54 {
55 int ch, sflag;
56 char *t;
57
58 sflag = 0;
59 while ((ch = getopt(argc, argv, "s")) != -1) {
60 switch((char)ch) {
61 case 's':
62 sflag = 1;
63 break;
64 case '?':
65 default:
66 usage();
67 /* NOTREACHED */
68 }
69 }
70
71 t = ttyname(STDIN_FILENO);
72 if (!sflag)
73 puts(t ? t : "not a tty");
74 exit(t ? 0 : 1);
75 }
76
77
78 static void
usage(void)79 usage(void)
80 {
81 fprintf(stderr, "usage: tty [-s]\n");
82 exit(2);
83 }
84