1994-05-26 06:35:07 +00:00
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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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.\" @(#)savecore.8 8.1 (Berkeley) 6/5/93
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.\"
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.Dd June 5, 1993
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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 a core dump of the operating system"
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.Sh SYNOPSIS
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.Nm savecore
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.Fl c
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.Nm savecore
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.Op Fl fvz
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.Op Fl N Ar system
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.Ar directory
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.Sh DESCRIPTION
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.Nm Savecore
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copies the currently running kernel and its associated core dump into
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.Fa directory ,
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and enters a reboot message and information about the core dump into
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the system log.
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.Pp
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The options are as follows:
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.Bl -tag -width directory
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.It Fl c
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Clears the dump, so that future invocations of
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.Nm savecore
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will ignore it.
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.It Fl f
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Forces a dump to be taken even if the dump doesn't appear correct or there
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is insufficient disk space.
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.It Fl N
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Use
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.Ar system
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as the kernel instead of the default ``/kernel''.
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.It Fl v
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Prints out some additional debugging information.
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.It Fl z
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Compresses the core dump and kernel (see
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.Xr compress 1 ).
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.El
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.Pp
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.Nm Savecore
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checks the core dump in various ways to make sure that it is current and
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that it corresponds to the currently running system.
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If it passes these checks, it saves the core image in
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.Ar directory Ns Pa /vmcore.#
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and the system in
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.Ar directory Ns Pa /kernel.#
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The ``#'' is the number from the first line of the file
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.Ar directory Ns Pa /bounds ,
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and it is incremented and stored back into the file each time
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.Nm savecore
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successfully runs.
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.Pp
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.Nm Savecore
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also checks the available disk space before attempting to make the copies.
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If there is insufficient disk space in the filesystem containing
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.Ar directory ,
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or if the file
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.Ar directory Ns Pa /minfree
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exists and the number of free kilobytes (for non-superusers) in the
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filesystem after the copies were made would be less than the number
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in the first line of this file, the copies are not attempted.
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.Pp
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If
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.Nm savecore
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successfully copies the kernel and the core dump, the core dump is cleared
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so that future invocations of
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.Nm savecore
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will ignore it.
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.Pp
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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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.Sh FILES
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.Bl -tag -width /kernelxx -compact
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.It Pa /kernel
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current
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.Tn UNIX
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.El
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.Sh BUGS
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The minfree code does not consider the effect of compression.
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.Sh SEE ALSO
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.Xr compress 1 ,
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.Xr syslogd 8
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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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