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 34 #ifndef lint 35 static char copyright[] = 36 "@(#) Copyright (c) 1988, 1993\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 /*static char sccsid[] = "from: @(#)hostname.c 8.1 (Berkeley) 5/31/93";*/ 42 static char *rcsid = "$Id: hostname.c,v 1.8 1994/09/26 06:53:23 mycroft Exp $"; 43 #endif /* not lint */ 44 45 #include <sys/param.h> 46 47 #include <err.h> 48 #include <stdio.h> 49 #include <stdlib.h> 50 #include <string.h> 51 #include <unistd.h> 52 53 void usage __P((void)); 54 55 int 56 main(argc, argv) 57 int argc; 58 char *argv[]; 59 { 60 int ch, sflag; 61 char *p, hostname[MAXHOSTNAMELEN]; 62 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 if (sflag && (p = strchr(hostname, '.'))) 86 *p = '\0'; 87 (void)printf("%s\n", hostname); 88 } 89 exit(0); 90 } 91 92 void 93 usage() 94 { 95 96 (void)fprintf(stderr, "usage: hostname [-s] [name-of-host]\n"); 97 exit(1); 98 } 99