1 /* $NetBSD: tty.c,v 1.6 2003/08/07 11:16:51 agc 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\n\ 35 The Regents of the University of California. All rights reserved.\n"); 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 1.6 2003/08/07 11:16:51 agc Exp $"); 43 #endif /* not lint */ 44 45 #include <stdio.h> 46 #include <stdlib.h> 47 #include <unistd.h> 48 49 int main __P((int, char **)); 50 static void usage __P((void)); 51 52 int 53 main(argc, argv) 54 int argc; 55 char **argv; 56 { 57 int ch, sflag; 58 char *t; 59 60 sflag = 0; 61 while ((ch = getopt(argc, argv, "s")) != -1) { 62 switch((char)ch) { 63 case 's': 64 sflag = 1; 65 break; 66 case '?': 67 default: 68 usage(); 69 /* NOTREACHED */ 70 } 71 } 72 73 t = ttyname(STDIN_FILENO); 74 if (!sflag) 75 puts(t ? t : "not a tty"); 76 exit(t ? 0 : 1); 77 } 78 79 80 static void 81 usage () 82 { 83 fprintf(stderr, "usage: tty [-s]\n"); 84 exit(2); 85 } 86