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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	* 4. Neither the name of the University nor the names of its contributors
	14	* may be used to endorse or promote products derived from this software
	15	* without specific prior written permission.
	16	*
	17	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	18	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	19	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	20	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	21	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	22	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	23	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	24	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	25	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	26	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	27	* SUCH DAMAGE.
	28	*/
	29
	30	#if 0
	31	#ifndef lint
	32	static char const copyright[] =
	33	"@(#) Copyright (c) 1988, 1993\n\
	34	The Regents of the University of California. All rights reserved.\n";
	35	#endif /* not lint */
	36
	37	#ifndef lint
	38	static char sccsid[] = "@(#)hostname.c 8.1 (Berkeley) 5/31/93";
	39	#endif /* not lint */
	40	#endif
	41	#include <sys/cdefs.h>
	42	__FBSDID("$FreeBSD: src/bin/hostname/hostname.c,v 1.19 2006/12/08 07:47:08 kientzle Exp $");
	43
	44	#include <sys/param.h>
	45
	46	#include <err.h>
	47	#include <stdio.h>
	48	#include <stdlib.h>
	49	#include <string.h>
	50	#include <unistd.h>
	51
	52	void usage(void);
	53
	54	int
	55	main(int argc, char *argv[])
	56	{
	57	int ch, sflag;
	58	char *p, hostname[MAXHOSTNAMELEN];
	59
	60	sflag = 0;
	61	while ((ch = getopt(argc, argv, "fs")) != -1)
	62	switch (ch) {
	63	case 'f':
	64	/*
	65	* On Linux, "hostname -f" prints FQDN.
	66	* BSD "hostname" always prints FQDN by
	67	* default, so we accept but ignore -f.
	68	*/
	69	break;
	70	case 's':
	71	sflag = 1;
	72	break;
	73	case '?':
	74	default:
	75	usage();
	76	}
	77	argc -= optind;
	78	argv += optind;
	79
	80	if (argc > 1)
	81	usage();
	82
	83	if (*argv) {
	84	if (sethostname(argv, (int)strlen(argv)))
	85	err(1, "sethostname");
	86	} else {
	87	if (gethostname(hostname, (int)sizeof(hostname)))
	88	err(1, "gethostname");
	89	if (sflag) {
	90	p = strchr(hostname, '.');
	91	if (p != NULL)
	92	*p = '\0';
	93	}
	94	(void)printf("%s\n", hostname);
	95	}
	96	exit(0);
	97	}
	98
	99	void
	100	usage(void)
	101	{
	102
	103	(void)fprintf(stderr, "usage: hostname [-fs] [name-of-host]\n");
	104	exit(1);
	105	}