dumpon.c revision 136104 
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 * 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
32static const char copyright[] =
33"@(#) Copyright (c) 1980, 1993\n\
34	The Regents of the University of California.  All rights reserved.\n";
35#endif /* not lint */
36
37#ifndef lint
38static char sccsid[] = "From: @(#)swapon.c	8.1 (Berkeley) 6/5/93";
39#endif /* not lint */
40#endif
41#include <sys/cdefs.h>
42__FBSDID("$FreeBSD: head/sbin/dumpon/dumpon.c 136104 2004-10-03 23:38:49Z des $");
43
44#include <sys/param.h>
45#include <sys/disk.h>
46#include <sys/sysctl.h>
47
48#include <err.h>
49#include <fcntl.h>
50#include <paths.h>
51#include <stdint.h>
52#include <stdio.h>
53#include <stdlib.h>
54#include <string.h>
55#include <sysexits.h>
56#include <unistd.h>
57
58static int	verbose;
59
60static void
61usage(void)
62{
63	fprintf(stderr, "%s\n%s\n",
64	    "usage: dumpon [-v] special_file",
65	    "       dumpon [-v] off");
66	exit(EX_USAGE);
67}
68
69static void
70check_size(int fd, const char *fn)
71{
72	int name[] = { CTL_HW, HW_PHYSMEM };
73	size_t namelen = sizeof name / sizeof *name;
74	unsigned long physmem;
75	size_t len = sizeof physmem;
76	off_t mediasize;
77
78	if (sysctl(name, namelen, &physmem, &len, NULL, 0) != 0)
79		err(EX_OSERR, "can't get memory size");
80	if (ioctl(fd, DIOCGMEDIASIZE, &mediasize) != 0)
81		err(EX_OSERR, "%s: can't get size", fn);
82	if (mediasize < physmem) {
83		if (verbose)
84			printf("%s is smaller than physical memory\n", fn);
85		exit(EX_IOERR);
86	}
87}
88
89int
90main(int argc, char *argv[])
91{
92	int ch;
93	int i, fd;
94	u_int u;
95
96	while ((ch = getopt(argc, argv, "v")) != -1)
97		switch((char)ch) {
98		case 'v':
99			verbose = 1;
100			break;
101		default:
102			usage();
103		}
104
105	argc -= optind;
106	argv += optind;
107
108	if (argc != 1)
109		usage();
110
111	if (strcmp(argv[0], "off") != 0) {
112		fd = open(argv[0], O_RDONLY);
113		if (fd < 0)
114			err(EX_OSFILE, "%s", argv[0]);
115		check_size(fd, argv[0]);
116		u = 0;
117		i = ioctl(fd, DIOCSKERNELDUMP, &u);
118		u = 1;
119		i = ioctl(fd, DIOCSKERNELDUMP, &u);
120		if (i == 0 && verbose)
121			printf("kernel dumps on %s\n", argv[0]);
122
123	} else {
124		fd = open(_PATH_DEVNULL, O_RDONLY);
125		if (fd < 0)
126			err(EX_OSFILE, "%s", _PATH_DEVNULL);
127		u = 0;
128		i = ioctl(fd, DIOCSKERNELDUMP, &u);
129		if (i == 0 && verbose)
130			printf("kernel dumps disabled\n");
131	}
132	if (i < 0)
133		err(EX_OSERR, "ioctl(DIOCSKERNELDUMP)");
134
135	exit (0);
136}
137