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FreeBSD man pages : savecore (8)
SAVECORE(8)		FreeBSD System Manager's Manual 	   SAVECORE(8)

NAME

savecore - save a core dump of the operating system

SYNOPSIS

savecore -c savecore [-fkvz] [-N system] directory

DESCRIPTION

The savecore utility copies the currently running kernel and its associ- ated core dump into directory, and enters a reboot message and informa- tion about the core dump into the system log. The options are as follows: -c Clear the dump, so that future invocations of savecore will ignore it. -f Force a dump to be taken even if the dump doesn't appear correct or there is insufficient disk space. -k Do not clear the dump after saving it. -N Use system as the kernel instead of the running kernel (as deter- mined from getbootfile(3)). -v Print out some additional debugging information. -z Compress the core dump and kernel (see gzip(1)). The savecore utility checks the core dump in various ways to make sure that it is current and that it corresponds to the currently running sys- tem. If it passes these checks, it saves the core image in directory/vmcore.# and the system in directory/kernel.# The ``#'' is the number from the first line of the file directory/bounds, and it is incre- mented and stored back into the file each time savecore successfully runs. The savecore utility also checks the available disk space before attempt- ing 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. The savecore utility is meant to be called near the end of the initial- ization file /etc/rc (see rc(8)).

BUGS

The minfree code does not consider the effect of compression.

SEE ALSO

gzip(1), getbootfile(3), dumpon(8), syslogd(8)

HISTORY

The savecore utility appeared in 4.1BSD. FreeBSD 4.8 September 23, 1994 FreeBSD 4.8