1/* $NetBSD: hostname.c,v 1.17 2011/08/29 14:51:18 joerg 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\ 35 The Regents of the University of California. All rights reserved."); 36#endif /* not lint */ 37 38#ifndef lint 39#if 0 40static char sccsid[] = "@(#)hostname.c 8.2 (Berkeley) 4/28/95"; 41#else 42__RCSID("$NetBSD: hostname.c,v 1.17 2011/08/29 14:51:18 joerg Exp $"); 43#endif 44#endif /* not lint */ 45 46#include <sys/param.h> 47 48#include <err.h> 49#include <stdio.h> 50#include <stdlib.h> 51#include <string.h> 52#include <unistd.h> 53 54__dead static void usage(void); 55 56int 57main(int argc, char *argv[]) 58{ 59 int ch, sflag; 60 char *p, hostname[MAXHOSTNAMELEN + 1]; 61 62 setprogname(argv[0]); 63 sflag = 0; 64 while ((ch = getopt(argc, argv, "s")) != -1) 65 switch (ch) { 66 case 's': 67 sflag = 1; 68 break; 69 case '?': 70 default: 71 usage(); 72 } 73 argc -= optind; 74 argv += optind; 75 76 if (argc > 1) 77 usage(); 78 79 if (*argv) { 80 if (sethostname(*argv, strlen(*argv))) 81 err(1, "sethostname"); 82 } else { 83 if (gethostname(hostname, sizeof(hostname))) 84 err(1, "gethostname"); 85 hostname[sizeof(hostname) - 1] = '\0'; 86 if (sflag && (p = strchr(hostname, '.'))) 87 *p = '\0'; 88 (void)printf("%s\n", hostname); 89 } 90 exit(0); 91 /* NOTREACHED */ 92} 93 94static void 95usage(void) 96{ 97 (void)fprintf(stderr, "usage: %s [-s] [name-of-host]\n", 98 getprogname()); 99 exit(1); 100 /* NOTREACHED */ 101} 102