2 * Copyright (c) 1980, 1993
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6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
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19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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29 * @(#)swapon.c 8.1 (Berkeley) 6/5/93
30 * $FreeBSD: src/sbin/dumpon/dumpon.c,v 1.10.2.2 2001/07/30 10:30:05 dd Exp $
40 #include <sys/param.h>
41 #include <sys/sysctl.h>
45 static const char *sc_name = "kern.dumpdev";
47 static struct stat *get_dumpdev(void);
48 static void usage(void) __dead2;
51 main(int argc, char **argv)
55 struct stat *stab_old;
59 if (strstr((p = strrchr(argv[0], '/')) ? p+1 : argv[0],
66 while ((ch = getopt(argc, argv, "v")) != -1) {
69 /* backward compatibility only */
79 if ((is_dumpoff && argc != 0) || (!is_dumpoff && argc != 1))
83 if (is_dumpoff || strcmp(path, "off") == 0) {
86 path = getdevpath(path, 0);
87 if (stat(path, &stab) != 0)
88 err(EX_OSFILE, "%s", path);
90 if (!S_ISCHR(stab.st_mode)) {
92 "%s: must specify a character disk device",
97 stab_old = get_dumpdev();
99 if (stab.st_rdev == stab_old->st_rdev) {
100 if (stab.st_rdev == NODEV) {
101 printf("dumpon: crash dumps already disabled.\n");
103 printf("dumpon: crash dumps already configured "
104 "to the given device.\n");
106 } else if (stab.st_rdev == NODEV || stab_old->st_rdev == NODEV) {
107 if (sysctlbyname(sc_name, NULL, NULL,
108 &stab.st_rdev, sizeof stab.st_rdev) != 0) {
109 err(EX_OSERR, "sysctl: %s", sc_name);
111 if (stab.st_rdev == NODEV) {
112 printf("dumpon: crash dumps disabled\n");
114 printf("dumpon: crash dumps to %s (%lu, %#lx)\n",
116 (unsigned long)major(stab.st_rdev),
117 (unsigned long)minor(stab.st_rdev));
120 warnx("crash dumps already configured "
121 "to another device (%lu, %#lx)",
122 (unsigned long)major(stab.st_rdev),
123 (unsigned long)minor(stab.st_rdev));
124 errx(EX_USAGE, "you need to run 'dumpoff' first.");
137 if ((stab = malloc(sizeof(*stab))) == NULL)
138 err(EX_OSERR, "malloc");
140 memset(stab, 0, sizeof(*stab));
141 len = sizeof(stab->st_rdev);
142 if (sysctlbyname(sc_name, &stab->st_rdev, &len, NULL, 0) != 0)
143 err(EX_OSERR, "sysctl: %s", sc_name);
152 "usage: dumpon [-v] special_file\n"