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