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My utility to specify where you want crash dumps to go. More user
and kernel support to follow.
This commit is contained in:
Garrett Wollman
parent
7b92fbb848
commit
83f9dfab4d
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=8478
6
sbin/dumpon/Makefile
Normal file
6
sbin/dumpon/Makefile
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@ -0,0 +1,6 @@
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# $Id$
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PROG= dumpon
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MAN8= dumpon.8
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.include <bsd.prog.mk>
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101
sbin/dumpon/dumpon.8
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101
sbin/dumpon/dumpon.8
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.\" Copyright (c) 1980, 1991, 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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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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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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.\" From: @(#)swapon.8 8.1 (Berkeley) 6/5/93
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.\" $Id$
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.\"
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.Dd May 12, 1995
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.Dt DUMPON 8
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.Os FreeBSD 2.1
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.Sh NAME
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.Nm dumpon
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.Nd "specify a device for crash dumps"
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.Sh SYNOPSIS
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.Nm dumpon
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.Op Fl v
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.Ar special_file
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.Sh DESCRIPTION
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.Nm Dumpon
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is used to specify a device where the kernel can save a crash dump in
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the case of a panic.
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The system begins with no dump area configured for safety, unless a
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.Dq dumps on
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clause was specified in the input to
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.Xr config 8 .
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The dump device must be one of the swap areas
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specified in the configuration file, and it must be at least the size
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of physical memory.
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Calls to
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.Nm dumpon
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normally occur in the system multi-user initialization file
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.Pa /etc/rc ,
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before the
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.Xr savecore 8
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program is run.
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The
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.Fl v
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flag can be specified to cause the
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.Nm
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program to be verbose about its activity.
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.Pp
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The
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.Nm
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program operates by setting the
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.Xr sysctl 3
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MIB variable
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.Dq kern.dumpdev
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to the device number of the designated
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.Ar special_file
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or to
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.Dv NODEV
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(meaning that no dumps are to be taken) if
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.Ar special_file
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is the text string
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.Dq Li off .
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.Sh SEE ALSO
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.Xr dumpon 2 ,
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.Xr init 8 ,
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.Xr rc 8 ,
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.Xr savecore 8
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.Sh FILES
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.Bl -tag -width /dev/[ws]d?b -compact
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.It Pa /dev/[ws]d?b
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standard paging devices
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.El
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.Sh BUGS
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Because the filesystem layer is already dead by the time a crash dump
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is taken, it is not possible to send crash dumps directly to a file.
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.Sh HISTORY
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The
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.Nm
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command appeared in
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.Tn FreeBSD
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2.1.
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129
sbin/dumpon/dumpon.c
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129
sbin/dumpon/dumpon.c
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/*
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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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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#ifndef lint
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static 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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static const char rcsid[] =
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"$Id$";
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#endif /* not lint */
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/sysctl.h>
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#include <sys/stat.h>
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#include <sysexits.h>
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#include <err.h>
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void usage __P((void)) __dead2;
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static char *whoami;
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int
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main(int argc, char **argv)
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{
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extern char *optarg;
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extern int optind;
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int ch, verbose, rv;
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struct stat stab;
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int mib[2];
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verbose = rv = 0;
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whoami = argv[0];
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while ((ch = getopt(argc, argv, "v")) != EOF)
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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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case '?':
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default:
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usage();
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}
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argv += optind;
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if (!argv[0] || argv[1])
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usage();
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if (strcmp(argv[0], "off")) {
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rv = stat(argv[0], &stab);
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if (rv) {
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err(EX_OSFILE, "%s", argv[0]);
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}
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if (!S_ISBLK(stab.st_mode)) {
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errx(EX_USAGE, "%s: must specify a block device",
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argv[0]);
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}
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} else {
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stab.st_rdev = NODEV;
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}
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mib[0] = CTL_KERN;
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mib[1] = KERN_DUMPDEV;
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rv = sysctl(mib, 2, (void *)0, (size_t *)0, &stab.st_rdev,
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sizeof stab.st_rdev);
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if (rv) {
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err(EX_OSERR, "sysctl: kern.dumpdev");
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}
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if (verbose) {
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if (stab.st_rdev == NODEV) {
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printf("%s: crash dumps disabled\n", whoami);
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} else {
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printf("%s: crash dumps to %s (%lu, %lu)\n",
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whoami, argv[0],
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(unsigned long)major(stab.st_rdev),
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(unsigned long)minor(stab.st_rdev));
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}
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}
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return 0;
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}
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void
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usage()
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{
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fprintf(stderr,
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"usage: %s [-v] special_file\n"
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" %s [-v] off\n", whoami, whoami);
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exit(EX_USAGE);
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}
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