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hostname.c revision 1.1 
      1 /*
      2  * Copyright (c) 1983, 1988 Regents of the University of California.
      3  * 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 char copyright[] =
     36 "@(#) Copyright (c) 1983, 1988 Regents of the University of California.\n\
     37  All rights reserved.\n";
     38 #endif /* not lint */
     39 
     40 #ifndef lint
     41 static char sccsid[] = "@(#)hostname.c	5.4 (Berkeley) 5/31/90";
     42 #endif /* not lint */
     43 
     44 #include <stdio.h>
     45 #include <sys/param.h>
     46 
     47 main(argc,argv)
     48 	int argc;
     49 	char **argv;
     50 {
     51 	extern int optind;
     52 	int ch, sflag;
     53 	char hostname[MAXHOSTNAMELEN], *p, *index();
     54 
     55 	sflag = 0;
     56 	while ((ch = getopt(argc, argv, "s")) != EOF)
     57 		switch((char)ch) {
     58 		case 's':
     59 			sflag = 1;
     60 			break;
     61 		case '?':
     62 		default:
     63 			fputs("hostname [-s] [hostname]\n", stderr);
     64 			exit(1);
     65 		}
     66 	argv += optind;
     67 
     68 	if (*argv) {
     69 		if (sethostname(*argv, strlen(*argv))) {
     70 			perror("sethostname");
     71 			exit(1);
     72 		}
     73 	} else {
     74 		if (gethostname(hostname, sizeof(hostname))) {
     75 			perror("gethostname");
     76 			exit(1);
     77 		}
     78 		if (sflag && (p = index(hostname, '.')))
     79 			*p = '\0';
     80 		puts(hostname);
     81 	}
     82 	exit(0);
     83 }
     84