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fe0057bb | 1 | /* |
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2 | * Copyright (c) 1988 Regents of the University of California. |
3 | * All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms are permitted | |
6 | * provided that the above copyright notice and this paragraph are | |
7 | * duplicated in all such forms and that any documentation, | |
8 | * advertising materials, and other materials related to such | |
9 | * distribution and use acknowledge that the software was developed | |
10 | * by the University of California, Berkeley. The name of the | |
11 | * University may not be used to endorse or promote products derived | |
12 | * from this software without specific prior written permission. | |
13 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR | |
14 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED | |
15 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
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16 | */ |
17 | ||
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18 | #ifndef lint |
19 | char copyright[] = | |
20 | "@(#) Copyright (c) 1988 Regents of the University of California.\n\ | |
21 | All rights reserved.\n"; | |
22 | #endif /* not lint */ | |
23 | ||
24 | #ifndef lint | |
25 | static char sccsid[] = "@(#)tty.c 4.2 (Berkeley) %G%"; | |
26 | #endif /* not lint */ | |
27 | ||
28 | #include <stdio.h> | |
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29 | |
30 | main(argc, argv) | |
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31 | int argc; |
32 | char **argv; | |
fe0057bb | 33 | { |
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34 | int ch, sflag; |
35 | char *t, *ttyname(); | |
36 | ||
37 | sflag = 0; | |
38 | while ((ch = getopt(argc, argv, "s")) != EOF) | |
39 | switch((char)ch) { | |
40 | case 's': | |
41 | sflag = 1; | |
42 | break; | |
43 | case '?': | |
44 | default: | |
45 | fputs("usage: tty [-s]\n", stderr); | |
46 | exit(1); | |
47 | } | |
fe0057bb | 48 | |
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49 | t = ttyname(0); |
50 | if (!sflag) | |
51 | puts(t ? t : "not a tty"); | |
52 | exit(t ? 0 : 1); | |
fe0057bb | 53 | } |