1/*
2 * Copyright 2001-2013 Haiku, Inc. All rights reserved.
3 * Distributed under the terms of the MIT License.
4 *
5 * Authors:
6 *				Daniel Reinhold, danielre@users.sf.net
7 */
8
9
10#include <stdio.h>
11#include <unistd.h>
12
13#include <OS.h>
14
15
16void
17usage()
18{
19	printf("Usage: tty [-s]\n"
20	       "Prints the file name for the terminal connected to standard input.\n"
21	       "  -s   silent mode: no output -- only return an exit status\n");
22
23	exit(2);
24}
25
26
27int
28main(int argc, char *argv[])
29{
30
31	if (argc > 2)
32		usage();
33
34	else {
35		bool silent = false;
36
37		if (argc == 2) {
38			if (!strcmp(argv[1], "-s"))
39				silent = true;
40			else
41				usage();
42		}
43
44		if (!silent)
45			printf("%s\n", ttyname(STDIN_FILENO));
46	}
47
48	return (isatty(STDIN_FILENO) ? 0 : 1);
49}
50