1*424d701aSjoerg /* $NetBSD: tty.c,v 1.8 2011/09/06 18:34:57 joerg Exp $ */
2ea2b6c7cSjtc
361f28255Scgd /*
4ea2b6c7cSjtc * Copyright (c) 1988, 1993
5ea2b6c7cSjtc * The Regents of the University of California. All rights reserved.
661f28255Scgd *
761f28255Scgd * Redistribution and use in source and binary forms, with or without
861f28255Scgd * modification, are permitted provided that the following conditions
961f28255Scgd * are met:
1061f28255Scgd * 1. Redistributions of source code must retain the above copyright
1161f28255Scgd * notice, this list of conditions and the following disclaimer.
1261f28255Scgd * 2. Redistributions in binary form must reproduce the above copyright
1361f28255Scgd * notice, this list of conditions and the following disclaimer in the
1461f28255Scgd * documentation and/or other materials provided with the distribution.
1589aaa1bbSagc * 3. Neither the name of the University nor the names of its contributors
1661f28255Scgd * may be used to endorse or promote products derived from this software
1761f28255Scgd * without specific prior written permission.
1861f28255Scgd *
1961f28255Scgd * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
2061f28255Scgd * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
2161f28255Scgd * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
2261f28255Scgd * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
2361f28255Scgd * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
2461f28255Scgd * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
2561f28255Scgd * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
2661f28255Scgd * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
2761f28255Scgd * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
2861f28255Scgd * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
2961f28255Scgd * SUCH DAMAGE.
3061f28255Scgd */
3161f28255Scgd
328320ff9bSlukem #include <sys/cdefs.h>
3361f28255Scgd #ifndef lint
3498e5374cSlukem __COPYRIGHT("@(#) Copyright (c) 1988, 1993\
3598e5374cSlukem The Regents of the University of California. All rights reserved.");
3661f28255Scgd #endif /* not lint */
3761f28255Scgd
3861f28255Scgd #ifndef lint
39ea2b6c7cSjtc #if 0
40ea2b6c7cSjtc static char sccsid[] = "@(#)tty.c 8.1 (Berkeley) 6/6/93";
41ea2b6c7cSjtc #endif
42*424d701aSjoerg __RCSID("$NetBSD: tty.c,v 1.8 2011/09/06 18:34:57 joerg Exp $");
4361f28255Scgd #endif /* not lint */
4461f28255Scgd
4561f28255Scgd #include <stdio.h>
46d3027df0Sjtc #include <stdlib.h>
47d3027df0Sjtc #include <unistd.h>
4861f28255Scgd
49*424d701aSjoerg __dead static void usage(void);
50d3027df0Sjtc
51d3027df0Sjtc int
main(int argc,char ** argv)52*424d701aSjoerg main(int argc, char **argv)
5361f28255Scgd {
5461f28255Scgd int ch, sflag;
55d3027df0Sjtc char *t;
5661f28255Scgd
5761f28255Scgd sflag = 0;
58d3027df0Sjtc while ((ch = getopt(argc, argv, "s")) != -1) {
5961f28255Scgd switch((char)ch) {
6061f28255Scgd case 's':
6161f28255Scgd sflag = 1;
6261f28255Scgd break;
6361f28255Scgd case '?':
6461f28255Scgd default:
65d3027df0Sjtc usage();
66d3027df0Sjtc /* NOTREACHED */
67d3027df0Sjtc }
6861f28255Scgd }
6961f28255Scgd
70d3027df0Sjtc t = ttyname(STDIN_FILENO);
7161f28255Scgd if (!sflag)
7261f28255Scgd puts(t ? t : "not a tty");
7361f28255Scgd exit(t ? 0 : 1);
7461f28255Scgd }
75d3027df0Sjtc
76d3027df0Sjtc static void
usage(void)77*424d701aSjoerg usage(void)
78d3027df0Sjtc {
79d3027df0Sjtc fprintf(stderr, "usage: tty [-s]\n");
80d3027df0Sjtc exit(2);
81d3027df0Sjtc }
82