119 lines
4.2 KiB
Groff
119 lines
4.2 KiB
Groff
.\" Copyright (c) 1980, 1991 The Regents of the University of California.
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.\" 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: @(#)savecore.8 6.6 (Berkeley) 3/16/91
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.\" $Id: savecore.8,v 1.6 1993/08/01 07:38:13 mycroft Exp $
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.\"
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.Dd March 16, 1991
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.Dt SAVECORE 8
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.Os BSD 4
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.Sh NAME
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.Nm savecore
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.Nd "save the details of a crash of the operating system"
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.Sh SYNOPSIS
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.Nm savecore
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.Ar dirname
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.Op Ar system
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.Sh DESCRIPTION
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.Nm Savecore
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is meant to be called near the end of the initialization file
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.Pa /etc/rc
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(see
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.Xr rc 8 ) .
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Its function
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is to detect the presence and save the state of the operating
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system's previous abnormal termination, assuming the state was recorded
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for this purpose. If this state information is found,
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.Nm savecore
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will also write a reboot message in the shutdown log.
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The state information is a snapshot of all RAM memory at the time
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of abnormal termination, untranslated by the processor's memory management
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unit, in physical rather than virtual order (like the memory device, see
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.Xr mem 4 ).
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.Pp
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Operands supported by
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.Nm savecore :
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.Bl -tag -width Ar
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.It Ar dirname
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The directory name where the core dump will be written.
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.It Ar system
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If the core dump was from a system other than
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.Pa /netbsd ,
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the name
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of that system must be supplied as
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.Ar system .
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.El
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.Pp
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.Nm Savecore
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looks for a physical RAM memory image of the current system
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(currently recorded during system crashes in the
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system's swap space) and it checks the image for veracity.
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If the saved memory image is valid, it saves this in
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.Ar dirname Ns Pa /ram.n
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and the current version of the operating system's executable file
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in
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.Ar dirname Ns Pa /system.n
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Sequence numbers are incremented and appended to the end of the pathnames
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each time
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.Nm savecore
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is run in the directory.
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.Pp
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Before savecore writes out a memory image, it reads a number from the file
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.Ar dirname Ns Pa /minfree .
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If the number of free kilobytes on the filesystem which contains
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.Ar dirname
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is less than the number obtained from the minfree file,
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the core dump is not saved.
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If the minfree file does not exist, savecore always writes out the core
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file (assuming that a core dump was taken).
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.Pp
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.Nm Savecore
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also logs a reboot message using facility
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.Dv LOG_AUTH
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(see
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.Xr syslog 3 )
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If the system crashed as a result of a panic,
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.Nm savecore
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logs the panic string too.
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.Sh FILES
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.Bl -tag -width /netbsd -compact
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.It Pa /netbsd
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current
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.Tn system executable file
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.El
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.Sh BUGS
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Can be fooled into thinking a core dump is the wrong size.
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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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.Bx 4.1 .
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