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 32 static 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 38 static char sccsid[] = "From: @(#)swapon.c 8.1 (Berkeley) 6/5/93"; 39 #endif /* not lint */ 40 #endif 41 #include <sys/cdefs.h> 42 __FBSDID("$FreeBSD$"); 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 58 static int verbose; 59 60 static void 61 usage(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 69 static void 70 check_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; 76 off_t mediasize; 77 int minidump; 78 79 80 len = sizeof minidump; 81 if (sysctlbyname("debug.minidump", &minidump, &len, NULL, 0) == 0 && 82 minidump == 1) 83 return; 84 len = sizeof physmem; 85 if (sysctl(name, namelen, &physmem, &len, NULL, 0) != 0) 86 err(EX_OSERR, "can't get memory size"); 87 if (ioctl(fd, DIOCGMEDIASIZE, &mediasize) != 0) 88 err(EX_OSERR, "%s: can't get size", fn); 89 if ((uintmax_t)mediasize < (uintmax_t)physmem) { 90 if (verbose) 91 printf("%s is smaller than physical memory\n", fn); 92 exit(EX_IOERR); 93 } 94 } 95 96 int 97 main(int argc, char *argv[]) 98 { 99 int ch; 100 int i, fd; 101 u_int u; 102 103 while ((ch = getopt(argc, argv, "v")) != -1) 104 switch((char)ch) { 105 case 'v': 106 verbose = 1; 107 break; 108 default: 109 usage(); 110 } 111 112 argc -= optind; 113 argv += optind; 114 115 if (argc != 1) 116 usage(); 117 118 if (strcmp(argv[0], "off") != 0) { 119 fd = open(argv[0], O_RDONLY); 120 if (fd < 0) 121 err(EX_OSFILE, "%s", argv[0]); 122 check_size(fd, argv[0]); 123 u = 0; 124 i = ioctl(fd, DIOCSKERNELDUMP, &u); 125 u = 1; 126 i = ioctl(fd, DIOCSKERNELDUMP, &u); 127 if (i == 0 && verbose) 128 printf("kernel dumps on %s\n", argv[0]); 129 } else { 130 fd = open(_PATH_DEVNULL, O_RDONLY); 131 if (fd < 0) 132 err(EX_OSFILE, "%s", _PATH_DEVNULL); 133 u = 0; 134 i = ioctl(fd, DIOCSKERNELDUMP, &u); 135 if (i == 0 && verbose) 136 printf("kernel dumps disabled\n"); 137 } 138 if (i < 0) 139 err(EX_OSERR, "ioctl(DIOCSKERNELDUMP)"); 140 141 exit (0); 142 } 143