1331722Seadler/* 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 * 4. Neither the name of the University nor the names of its contributors 141590Srgrimes * may be used to endorse or promote products derived from this software 151590Srgrimes * without specific prior written permission. 161590Srgrimes * 171590Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 181590Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 191590Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 201590Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 211590Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 221590Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 231590Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 241590Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 251590Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 261590Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 271590Srgrimes * SUCH DAMAGE. 281590Srgrimes */ 291590Srgrimes 301590Srgrimes#ifndef lint 3128372Scharnierstatic const char copyright[] = 321590Srgrimes"@(#) Copyright (c) 1988, 1993\n\ 331590Srgrimes The Regents of the University of California. All rights reserved.\n"; 341590Srgrimes#endif /* not lint */ 351590Srgrimes 361590Srgrimes#ifndef lint 3728372Scharnier#if 0 381590Srgrimesstatic char sccsid[] = "@(#)tty.c 8.1 (Berkeley) 6/6/93"; 3928372Scharnier#endif 401590Srgrimes#endif /* not lint */ 411590Srgrimes 4297482Sjmallett#include <sys/cdefs.h> 4397482Sjmallett__FBSDID("$FreeBSD$"); 4497482Sjmallett 451590Srgrimes#include <stdio.h> 4678718Sdd#include <stdlib.h> 4728372Scharnier#include <unistd.h> 481590Srgrimes 4992922Simpstatic void usage(void); 5028372Scharnier 5128372Scharnierint 5297482Sjmallettmain(int argc, char *argv[]) 531590Srgrimes{ 541590Srgrimes int ch, sflag; 5587302Sdwmalone char *t; 561590Srgrimes 571590Srgrimes sflag = 0; 5824360Simp while ((ch = getopt(argc, argv, "s")) != -1) 5997484Sjmallett switch (ch) { 601590Srgrimes case 's': 611590Srgrimes sflag = 1; 621590Srgrimes break; 631590Srgrimes case '?': 641590Srgrimes default: 6528372Scharnier usage(); 661590Srgrimes } 671590Srgrimes 681590Srgrimes t = ttyname(0); 691590Srgrimes if (!sflag) 701590Srgrimes puts(t ? t : "not a tty"); 711590Srgrimes exit(t ? 0 : 1); 721590Srgrimes} 7328372Scharnier 7428372Scharnierstatic void 7597482Sjmallettusage(void) 7628372Scharnier{ 7728372Scharnier fprintf(stderr, "usage: tty [-s]\n"); 7828372Scharnier exit(2); 7928372Scharnier} 80