Annotation of src/usr.bin/tty/tty.c, Revision 1.6
1.6 ! deraadt 1: /* $OpenBSD: tty.c,v 1.5 2003/06/10 22:20:53 deraadt Exp $ */
1.1 deraadt 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.
1.4 millert 16: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 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: #include <stdio.h>
34: #include <stdlib.h>
35: #include <unistd.h>
36:
1.3 millert 37: static void usage(void);
1.1 deraadt 38:
39: int
1.5 deraadt 40: main(int argc, char *argv[])
1.1 deraadt 41: {
42: int ch, sflag;
43: char *t;
44:
45: sflag = 0;
46: while ((ch = getopt(argc, argv, "s")) != -1) {
47: switch((char)ch) {
48: case 's':
49: sflag = 1;
50: break;
51: case '?':
52: default:
53: usage();
54: /* NOTREACHED */
55: }
56: }
57:
58: t = ttyname(STDIN_FILENO);
59: if (!sflag)
60: puts(t ? t : "not a tty");
61: exit(t ? 0 : 1);
62: }
63:
64:
65: static void
1.5 deraadt 66: usage(void)
1.1 deraadt 67: {
68: fprintf(stderr, "usage: tty [-s]\n");
69: exit(2);
70: }