dumpon.c revision 96381 
1/*
2 * Copyright (c) 1980, 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
35static const char copyright[] =
36"@(#) Copyright (c) 1980, 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
42static char sccsid[] = "From: @(#)swapon.c	8.1 (Berkeley) 6/5/93";
43#endif
44static const char rcsid[] =
45  "$FreeBSD: head/sbin/dumpon/dumpon.c 96381 2002-05-11 03:07:38Z alfred $";
46#endif /* not lint */
47
48#include <err.h>
49#include <stdio.h>
50#include <stdlib.h>
51#include <fcntl.h>
52#include <paths.h>
53#include <string.h>
54#include <unistd.h>
55#include <sys/param.h>
56#include <sys/disk.h>
57#include <sysexits.h>
58
59void	usage(void) __dead2;
60
61int
62main(int argc, char *argv[])
63{
64	int ch, verbose, rv;
65	int i, fd;
66	u_int u;
67
68	verbose = rv = 0;
69	while ((ch = getopt(argc, argv, "v")) != -1)
70		switch((char)ch) {
71		case 'v':
72			verbose = 1;
73			break;
74		case '?':
75		default:
76			usage();
77		}
78	argv += optind;
79
80	if (!argv[0] || argv[1])
81		usage();
82
83	if (strcmp(argv[0], "off")) {
84		fd = open(argv[0], O_RDONLY);
85		if (fd < 0)
86			err(EX_OSFILE, "%s", argv[0]);
87		u = 0;
88		i = ioctl(fd, DIOCSKERNELDUMP, &u);
89		u = 1;
90		i = ioctl(fd, DIOCSKERNELDUMP, &u);
91		if (i == 0 && verbose)
92			printf("kernel dumps on %s\n", argv[0]);
93
94	} else {
95		fd = open(_PATH_DEVNULL, O_RDONLY);
96		if (fd < 0)
97			err(EX_OSFILE, "%s", _PATH_DEVNULL);
98		u = 0;
99		i = ioctl(fd, DIOCSKERNELDUMP, &u);
100		if (i == 0 && verbose)
101			printf("kernel dumps disabled\n");
102	}
103	if (i < 0)
104		err(EX_OSERR, "ioctl(DIOCSKERNELDUMP)");
105
106	exit (0);
107}
108
109void
110usage(void)
111{
112	fprintf(stderr,
113		"usage: dumpon [-v] special_file\n"
114		"       dumpon [-v] off\n");
115	exit(EX_USAGE);
116}
117