logname.c revision 1590
11590Srgrimes/*- 21590Srgrimes * Copyright (c) 1991, 1993, 1994 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 351590Srgrimesstatic char copyright[] = 361590Srgrimes"@(#) Copyright (c) 1991, 1993, 1994\n\ 371590Srgrimes The Regents of the University of California. All rights reserved.\n"; 381590Srgrimes#endif /* not lint */ 391590Srgrimes 401590Srgrimes#ifndef lint 411590Srgrimesstatic char sccsid[] = "@(#)logname.c 8.2 (Berkeley) 4/3/94"; 421590Srgrimes#endif /* not lint */ 431590Srgrimes 441590Srgrimes#include <err.h> 451590Srgrimes#include <errno.h> 461590Srgrimes#include <unistd.h> 471590Srgrimes#include <stdio.h> 481590Srgrimes#include <stdlib.h> 491590Srgrimes#include <string.h> 501590Srgrimes 511590Srgrimesvoid usage __P((void)); 521590Srgrimes 531590Srgrimesint 541590Srgrimesmain(argc, argv) 551590Srgrimes int argc; 561590Srgrimes char *argv[]; 571590Srgrimes{ 581590Srgrimes int ch; 591590Srgrimes char *p; 601590Srgrimes 611590Srgrimes while ((ch = getopt(argc, argv, "")) != EOF) 621590Srgrimes switch (ch) { 631590Srgrimes case '?': 641590Srgrimes default: 651590Srgrimes usage(); 661590Srgrimes } 671590Srgrimes argc -= optind; 681590Srgrimes argv += optind; 691590Srgrimes 701590Srgrimes if ((p = getlogin()) == NULL) 711590Srgrimes err(1, NULL); 721590Srgrimes (void)printf("%s\n", p); 731590Srgrimes exit(0); 741590Srgrimes} 751590Srgrimes 761590Srgrimesvoid 771590Srgrimesusage() 781590Srgrimes{ 791590Srgrimes (void)fprintf(stderr, "usage: logname\n"); 801590Srgrimes exit(1); 811590Srgrimes} 82