1 /* 2 * Copyright (c) 1988, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#) Copyright (c) 1988, 1993 The Regents of the University of California. All rights reserved. 34 * @(#)hostname.c 8.1 (Berkeley) 5/31/93 35 * $FreeBSD: src/bin/hostname/hostname.c,v 1.10.2.1 2001/08/01 02:40:23 obrien Exp $ 36 * $DragonFly: src/bin/hostname/hostname.c,v 1.4 2003/09/28 14:39:14 hmp Exp $ 37 */ 38 39 #include <sys/param.h> 40 41 #include <err.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <string.h> 45 #include <unistd.h> 46 47 int main (int, char *[]); 48 void usage (void); 49 50 int 51 main(int argc, char **argv) 52 { 53 int ch, sflag; 54 char *p, hostname[MAXHOSTNAMELEN]; 55 56 sflag = 0; 57 while ((ch = getopt(argc, argv, "s")) != -1) 58 switch (ch) { 59 case 's': 60 sflag = 1; 61 break; 62 case '?': 63 default: 64 usage(); 65 } 66 argc -= optind; 67 argv += optind; 68 69 if (argc > 1) 70 usage(); 71 72 if (*argv) { 73 if (sethostname(*argv, (int)strlen(*argv))) 74 err(1, "sethostname"); 75 } else { 76 if (gethostname(hostname, (int)sizeof(hostname))) 77 err(1, "gethostname"); 78 if (sflag && (p = strchr(hostname, '.'))) 79 *p = '\0'; 80 (void)printf("%s\n", hostname); 81 } 82 exit(0); 83 } 84 85 void 86 usage(void) 87 { 88 89 (void)fprintf(stderr, "usage: hostname [-s] [name-of-host]\n"); 90 exit(1); 91 } 92