1 /* $NetBSD: hostname.c,v 1.14 2001/09/16 13:48:35 wiz 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 __COPYRIGHT("@(#) Copyright (c) 1988, 1993\n\ 39 The Regents of the University of California. All rights reserved.\n"); 40 #endif /* not lint */ 41 42 #ifndef lint 43 #if 0 44 static char sccsid[] = "@(#)hostname.c 8.2 (Berkeley) 4/28/95"; 45 #else 46 __RCSID("$NetBSD: hostname.c,v 1.14 2001/09/16 13:48:35 wiz Exp $"); 47 #endif 48 #endif /* not lint */ 49 50 #include <sys/param.h> 51 52 #include <err.h> 53 #include <stdio.h> 54 #include <stdlib.h> 55 #include <string.h> 56 #include <unistd.h> 57 58 void usage(void); 59 int main(int, char *[]); 60 61 int 62 main(int argc, char *argv[]) 63 { 64 int ch, sflag; 65 char *p, hostname[MAXHOSTNAMELEN + 1]; 66 67 setprogname(argv[0]); 68 sflag = 0; 69 while ((ch = getopt(argc, argv, "s")) != -1) 70 switch (ch) { 71 case 's': 72 sflag = 1; 73 break; 74 case '?': 75 default: 76 usage(); 77 } 78 argc -= optind; 79 argv += optind; 80 81 if (argc > 1) 82 usage(); 83 84 if (*argv) { 85 if (sethostname(*argv, strlen(*argv))) 86 err(1, "sethostname"); 87 } else { 88 if (gethostname(hostname, sizeof(hostname))) 89 err(1, "gethostname"); 90 hostname[sizeof(hostname) - 1] = '\0'; 91 if (sflag && (p = strchr(hostname, '.'))) 92 *p = '\0'; 93 (void)printf("%s\n", hostname); 94 } 95 exit(0); 96 /* NOTREACHED */ 97 } 98 99 void 100 usage(void) 101 { 102 (void)fprintf(stderr, "usage: %s [-s] [name-of-host]\n", 103 getprogname()); 104 exit(1); 105 /* NOTREACHED */ 106 } 107