1 /* $NetBSD: tty.c,v 1.8 2011/09/06 18:34:57 joerg Exp $ */
2
3 /*
4 * Copyright (c) 1988, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 #ifndef lint
34 __COPYRIGHT("@(#) Copyright (c) 1988, 1993\
35 The Regents of the University of California. All rights reserved.");
36 #endif /* not lint */
37
38 #ifndef lint
39 #if 0
40 static char sccsid[] = "@(#)tty.c 8.1 (Berkeley) 6/6/93";
41 #endif
42 __RCSID("$NetBSD: tty.c,v 1.8 2011/09/06 18:34:57 joerg Exp $");
43 #endif /* not lint */
44
45 #include <stdio.h>
46 #include <stdlib.h>
47 #include <unistd.h>
48
49 __dead static void usage(void);
50
51 int
main(int argc,char ** argv)52 main(int argc, char **argv)
53 {
54 int ch, sflag;
55 char *t;
56
57 sflag = 0;
58 while ((ch = getopt(argc, argv, "s")) != -1) {
59 switch((char)ch) {
60 case 's':
61 sflag = 1;
62 break;
63 case '?':
64 default:
65 usage();
66 /* NOTREACHED */
67 }
68 }
69
70 t = ttyname(STDIN_FILENO);
71 if (!sflag)
72 puts(t ? t : "not a tty");
73 exit(t ? 0 : 1);
74 }
75
76 static void
usage(void)77 usage(void)
78 {
79 fprintf(stderr, "usage: tty [-s]\n");
80 exit(2);
81 }
82