143 lines
3.8 KiB
C
143 lines
3.8 KiB
C
/*
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* Copyright (c) 1980, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if 0
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#ifndef lint
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static const char copyright[] =
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"@(#) Copyright (c) 1980, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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static char sccsid[] = "From: @(#)swapon.c 8.1 (Berkeley) 6/5/93";
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#endif /* not lint */
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#endif
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/disk.h>
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#include <sys/sysctl.h>
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#include <err.h>
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#include <fcntl.h>
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#include <paths.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sysexits.h>
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#include <unistd.h>
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static int verbose;
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static void
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usage(void)
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{
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fprintf(stderr, "%s\n%s\n",
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"usage: dumpon [-v] special_file",
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" dumpon [-v] off");
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exit(EX_USAGE);
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}
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static void
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check_size(int fd, const char *fn)
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{
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int name[] = { CTL_HW, HW_PHYSMEM };
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size_t namelen = sizeof name / sizeof *name;
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unsigned long physmem;
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size_t len;
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off_t mediasize;
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int minidump;
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len = sizeof minidump;
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if (sysctlbyname("debug.minidump", &minidump, &len, NULL, 0) == 0 &&
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minidump == 1)
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return;
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len = sizeof physmem;
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if (sysctl(name, namelen, &physmem, &len, NULL, 0) != 0)
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err(EX_OSERR, "can't get memory size");
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if (ioctl(fd, DIOCGMEDIASIZE, &mediasize) != 0)
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err(EX_OSERR, "%s: can't get size", fn);
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if ((uintmax_t)mediasize < (uintmax_t)physmem) {
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if (verbose)
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printf("%s is smaller than physical memory\n", fn);
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exit(EX_IOERR);
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}
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}
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int
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main(int argc, char *argv[])
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{
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int ch;
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int i, fd;
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u_int u;
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while ((ch = getopt(argc, argv, "v")) != -1)
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switch((char)ch) {
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case 'v':
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verbose = 1;
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break;
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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if (argc != 1)
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usage();
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if (strcmp(argv[0], "off") != 0) {
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fd = open(argv[0], O_RDONLY);
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if (fd < 0)
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err(EX_OSFILE, "%s", argv[0]);
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check_size(fd, argv[0]);
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u = 0;
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i = ioctl(fd, DIOCSKERNELDUMP, &u);
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u = 1;
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i = ioctl(fd, DIOCSKERNELDUMP, &u);
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if (i == 0 && verbose)
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printf("kernel dumps on %s\n", argv[0]);
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} else {
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fd = open(_PATH_DEVNULL, O_RDONLY);
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if (fd < 0)
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err(EX_OSFILE, "%s", _PATH_DEVNULL);
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u = 0;
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i = ioctl(fd, DIOCSKERNELDUMP, &u);
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if (i == 0 && verbose)
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printf("kernel dumps disabled\n");
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}
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if (i < 0)
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err(EX_OSERR, "ioctl(DIOCSKERNELDUMP)");
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exit (0);
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}
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