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 <unistd.h> 51 #include <sys/param.h> 52 #include <sys/sysctl.h> 53 #include <sys/stat.h> 54 #include <sysexits.h> 55 56 void usage __P((void)) __dead2; 57 58 int 59 main(int argc, char **argv) 60 { 61 int ch, verbose, rv; 62 struct stat stab; 63 int mib[2]; 64 65 verbose = rv = 0; 66 while ((ch = getopt(argc, argv, "v")) != -1) 67 switch((char)ch) { 68 case 'v': 69 verbose = 1; 70 break; 71 case '?': 72 default: 73 usage(); 74 } 75 argv += optind; 76 77 if (!argv[0] || argv[1]) 78 usage(); 79 80 if (strcmp(argv[0], "off")) { 81 rv = stat(argv[0], &stab); 82 if (rv) { 83 err(EX_OSFILE, "%s", argv[0]); 84 } 85 86 if (!S_ISCHR(stab.st_mode)) { 87 errx(EX_USAGE, 88 "%s: must specify a character disk device", 89 argv[0]); 90 } 91 } else { 92 stab.st_rdev = NODEV; 93 } 94 95 mib[0] = CTL_KERN; 96 mib[1] = KERN_DUMPDEV; 97 98 rv = sysctl(mib, 2, (void *)0, (size_t *)0, &stab.st_rdev, 99 sizeof stab.st_rdev); 100 if (rv) { 101 err(EX_OSERR, "sysctl: kern.dumpdev"); 102 } 103 104 if (verbose) { 105 if (stab.st_rdev == NODEV) { 106 printf("dumpon: crash dumps disabled\n"); 107 } else { 108 printf("dumpon: crash dumps to %s (%lu, %lu)\n", 109 argv[0], 110 (unsigned long)major(stab.st_rdev), 111 (unsigned long)minor(stab.st_rdev)); 112 } 113 } 114 115 return 0; 116 } 117 118 void 119 usage() 120 { 121 fprintf(stderr, 122 "usage: dumpon [-v] special_file\n" 123 " dumpon [-v] off\n"); 124 exit(EX_USAGE); 125 } 126