1 /* $NetBSD: hostname.c,v 1.16 2008/07/20 00:52:39 lukem 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 40 static char sccsid[] = "@(#)hostname.c 8.2 (Berkeley) 4/28/95"; 41 #else 42 __RCSID("$NetBSD: hostname.c,v 1.16 2008/07/20 00:52:39 lukem 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 void usage(void); 55 int main(int, char *[]); 56 57 int 58 main(int argc, char *argv[]) 59 { 60 int ch, sflag; 61 char *p, hostname[MAXHOSTNAMELEN + 1]; 62 63 setprogname(argv[0]); 64 sflag = 0; 65 while ((ch = getopt(argc, argv, "s")) != -1) 66 switch (ch) { 67 case 's': 68 sflag = 1; 69 break; 70 case '?': 71 default: 72 usage(); 73 } 74 argc -= optind; 75 argv += optind; 76 77 if (argc > 1) 78 usage(); 79 80 if (*argv) { 81 if (sethostname(*argv, strlen(*argv))) 82 err(1, "sethostname"); 83 } else { 84 if (gethostname(hostname, sizeof(hostname))) 85 err(1, "gethostname"); 86 hostname[sizeof(hostname) - 1] = '\0'; 87 if (sflag && (p = strchr(hostname, '.'))) 88 *p = '\0'; 89 (void)printf("%s\n", hostname); 90 } 91 exit(0); 92 /* NOTREACHED */ 93 } 94 95 void 96 usage(void) 97 { 98 (void)fprintf(stderr, "usage: %s [-s] [name-of-host]\n", 99 getprogname()); 100 exit(1); 101 /* NOTREACHED */ 102 } 103