NAME
savecore —
save a core dump of the operating
system
SYNOPSIS
savecore |
[-cfvz] [-N
system] directory |
DESCRIPTION
savecore copies the currently running
kernel and its associated core dump into directory,
and enters a reboot message and information about the core dump into the
system log.
The options are as follows:
-c- Clears the dump, so that future invocations of
savecorewill ignore it. -f- Forces a dump to be taken even if the dump doesn't appear correct or there is insufficient disk space.
-Nsystem- Use system as the kernel instead of the default /bsd.
-v- Prints out some additional debugging information.
-z- Compresses the core dump and kernel (see compress(1)).
savecore checks the core dump in various
ways to make sure that it is current and that it corresponds to the
currently running system. If it passes these checks, it saves the core image
in directory/bsd.#.core and
the system in directory/bsd.#
(or in directory/bsd.#.core.Z
and directory/bsd.#.Z,
respectively, if the -z option is used). The
“#” is the number from the first line of the file
directory/bounds, and it is
incremented and stored back into the file each time
savecore successfully runs.
savecore also checks the available disk
space before attempting to make the copies. If there is insufficient disk
space in the filesystem containing directory, or if
the file directory/minfree
exists and the number of free kilobytes (for non-superusers) in the
filesystem after the copies were made would be less than the number in the
first line of this file, the copies are not attempted.
If savecore successfully copies the kernel
and the core dump, the core dump is cleared so that future invocations of
savecore will ignore it.
savecore is meant to be called near the
end of the initialization file /etc/rc (see
rc(8)).
FILES
- /bsd
- current kernel
SEE ALSO
HISTORY
The savecore command appeared in
4.1BSD.
BUGS
The minfree code does not consider the effect of compression.