daemon.c revision 117280 
1/*-
2 * Copyright (c) 1999 Berkeley Software Design, Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 * 3. Berkeley Software Design Inc's name may not be used to endorse or
13 *    promote products derived from this software without specific prior
14 *    written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN INC ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL BERKELEY SOFTWARE DESIGN INC BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 *	From BSDI: daemon.c,v 1.2 1996/08/15 01:11:09 jch Exp
29 */
30
31#include <sys/cdefs.h>
32__FBSDID("$FreeBSD: head/usr.sbin/daemon/daemon.c 117280 2003-07-06 12:44:11Z charnier $");
33
34#include <sys/types.h>
35
36#include <err.h>
37#include <stdio.h>
38#include <stdlib.h>
39#include <unistd.h>
40
41static void usage(void);
42
43int
44main(int argc, char *argv[])
45{
46	int ch, nochdir, noclose;
47
48	nochdir = noclose = 1;
49	while ((ch = getopt(argc, argv, "-cf")) != -1) {
50		switch (ch) {
51		case 'c':
52			nochdir = 0;
53			break;
54		case 'f':
55			noclose = 0;
56			break;
57		case '?':
58		default:
59			usage();
60		}
61	}
62	argc -= optind;
63	argv += optind;
64
65	if (argc == 0)
66		usage();
67	if (daemon(nochdir, noclose) == -1)
68		err(1, NULL);
69	execvp(argv[0], argv);
70
71	/* The child is now running, so the exit status doesn't matter. */
72	err(1, "%s", argv[0]);
73}
74
75static void
76usage(void)
77{
78	(void)fprintf(stderr, "usage: daemon [-cf] command arguments ...\n");
79	exit(1);
80}
81