dumpon.c revision 8478 
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 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/*static char sccsid[] = "From: @(#)swapon.c	8.1 (Berkeley) 6/5/93";*/
42static const char rcsid[] =
43	"$Id$";
44#endif /* not lint */
45
46#include <errno.h>
47#include <stdio.h>
48#include <stdlib.h>
49#include <unistd.h>
50#include <sys/param.h>
51#include <sys/types.h>
52#include <sys/sysctl.h>
53#include <sys/stat.h>
54#include <sysexits.h>
55#include <err.h>
56
57void	usage __P((void)) __dead2;
58static char *whoami;
59
60int
61main(int argc, char **argv)
62{
63	extern char *optarg;
64	extern int optind;
65	int ch, verbose, rv;
66	struct stat stab;
67	int mib[2];
68
69	verbose = rv = 0;
70	whoami = argv[0];
71	while ((ch = getopt(argc, argv, "v")) != EOF)
72		switch((char)ch) {
73		case 'v':
74			verbose = 1;
75			break;
76		case '?':
77		default:
78			usage();
79		}
80	argv += optind;
81
82	if (!argv[0] || argv[1])
83		usage();
84
85	if (strcmp(argv[0], "off")) {
86		rv = stat(argv[0], &stab);
87		if (rv) {
88			err(EX_OSFILE, "%s", argv[0]);
89		}
90
91		if (!S_ISBLK(stab.st_mode)) {
92			errx(EX_USAGE, "%s: must specify a block device",
93			     argv[0]);
94		}
95	} else {
96		stab.st_rdev = NODEV;
97	}
98
99	mib[0] = CTL_KERN;
100	mib[1] = KERN_DUMPDEV;
101
102	rv = sysctl(mib, 2, (void *)0, (size_t *)0, &stab.st_rdev,
103		    sizeof stab.st_rdev);
104	if (rv) {
105		err(EX_OSERR, "sysctl: kern.dumpdev");
106	}
107
108	if (verbose) {
109		if (stab.st_rdev == NODEV) {
110			printf("%s: crash dumps disabled\n", whoami);
111		} else {
112			printf("%s: crash dumps to %s (%lu, %lu)\n",
113			       whoami, argv[0],
114			       (unsigned long)major(stab.st_rdev),
115			       (unsigned long)minor(stab.st_rdev));
116		}
117	}
118
119	return 0;
120}
121
122void
123usage()
124{
125	fprintf(stderr,
126		"usage: %s [-v] special_file\n"
127		"       %s [-v] off\n", whoami, whoami);
128	exit(EX_USAGE);
129}
130