tty.c revision 92922
11590Srgrimes/* 21590Srgrimes * Copyright (c) 1988, 1993 31590Srgrimes * The Regents of the University of California. All rights reserved. 41590Srgrimes * 51590Srgrimes * Redistribution and use in source and binary forms, with or without 61590Srgrimes * modification, are permitted provided that the following conditions 71590Srgrimes * are met: 81590Srgrimes * 1. Redistributions of source code must retain the above copyright 91590Srgrimes * notice, this list of conditions and the following disclaimer. 101590Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 111590Srgrimes * notice, this list of conditions and the following disclaimer in the 121590Srgrimes * documentation and/or other materials provided with the distribution. 131590Srgrimes * 3. All advertising materials mentioning features or use of this software 141590Srgrimes * must display the following acknowledgement: 151590Srgrimes * This product includes software developed by the University of 161590Srgrimes * California, Berkeley and its contributors. 171590Srgrimes * 4. Neither the name of the University nor the names of its contributors 181590Srgrimes * may be used to endorse or promote products derived from this software 191590Srgrimes * without specific prior written permission. 201590Srgrimes * 211590Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 221590Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 231590Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 241590Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 251590Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 261590Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 271590Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 281590Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 291590Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 301590Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 311590Srgrimes * SUCH DAMAGE. 321590Srgrimes */ 331590Srgrimes 341590Srgrimes#ifndef lint 3528372Scharnierstatic const char copyright[] = 361590Srgrimes"@(#) Copyright (c) 1988, 1993\n\ 371590Srgrimes The Regents of the University of California. All rights reserved.\n"; 381590Srgrimes#endif /* not lint */ 391590Srgrimes 401590Srgrimes#ifndef lint 4128372Scharnier#if 0 421590Srgrimesstatic char sccsid[] = "@(#)tty.c 8.1 (Berkeley) 6/6/93"; 4328372Scharnier#endif 4428372Scharnierstatic const char rcsid[] = 4550477Speter "$FreeBSD: head/usr.bin/tty/tty.c 92922 2002-03-22 01:42:45Z imp $"; 461590Srgrimes#endif /* not lint */ 471590Srgrimes 481590Srgrimes#include <stdio.h> 4978718Sdd#include <stdlib.h> 5028372Scharnier#include <unistd.h> 511590Srgrimes 5292922Simpstatic void usage(void); 5328372Scharnier 5428372Scharnierint 551590Srgrimesmain(argc, argv) 561590Srgrimes int argc; 571590Srgrimes char **argv; 581590Srgrimes{ 591590Srgrimes int ch, sflag; 6087302Sdwmalone char *t; 611590Srgrimes 621590Srgrimes sflag = 0; 6324360Simp while ((ch = getopt(argc, argv, "s")) != -1) 641590Srgrimes switch((char)ch) { 651590Srgrimes case 's': 661590Srgrimes sflag = 1; 671590Srgrimes break; 681590Srgrimes case '?': 691590Srgrimes default: 7028372Scharnier usage(); 711590Srgrimes } 721590Srgrimes 731590Srgrimes t = ttyname(0); 741590Srgrimes if (!sflag) 751590Srgrimes puts(t ? t : "not a tty"); 761590Srgrimes exit(t ? 0 : 1); 771590Srgrimes} 7828372Scharnier 7928372Scharnierstatic void 8028372Scharnierusage() 8128372Scharnier{ 8228372Scharnier fprintf(stderr, "usage: tty [-s]\n"); 8328372Scharnier exit(2); 8428372Scharnier} 85