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Commit	Line	Data
	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 const 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	#if 0
	42	static char sccsid[] = "@(#)hostname.c 8.1 (Berkeley) 5/31/93";
	43	#endif
	44	#endif /* not lint */
	45	#include <sys/cdefs.h>
	46	__RCSID("$FreeBSD: src/bin/hostname/hostname.c,v 1.14 2002/06/30 05:13:53 obrien Exp $");
	47
	48	#include <sys/param.h>
	49
	50	#include <err.h>
	51	#include <stdio.h>
	52	#include <stdlib.h>
	53	#include <string.h>
	54	#include <unistd.h>
	55
	56	void usage(void);
	57
	58	int
	59	main(int argc, char *argv[])
	60	{
	61	int ch, sflag;
	62	char *p, hostname[MAXHOSTNAMELEN];
	63
	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, (int)strlen(argv)))
	82	err(1, "sethostname");
	83	} else {
	84	if (gethostname(hostname, (int)sizeof(hostname)))
	85	err(1, "gethostname");
	86	if (sflag) {
	87	p = strchr(hostname, '.');
	88	if (p != NULL)
	89	*p = '\0';
	90	}
	91	(void)printf("%s\n", hostname);
	92	}
	93	exit(0);
	94	}
	95
	96	void
	97	usage(void)
	98	{
	99
	100	(void)fprintf(stderr, "usage: hostname [-s] [name-of-host]\n");
	101	exit(1);
	102	}