savecore -- save a core dump of the operating system
savecore -C [-v] [directory device]
savecore [-fkvz] [directory [device ...]]
The savecore utility copies a core dump into directory, or the current
working directory if no directory argument is given, and enters a reboot
message and information about the core dump into the system log.
The options are as follows:
-C Check to see if a dump exists, and display a brief message to
indicate the status. An exit status of 0 indicates that a dump
is there, 1 indicates that none exists. This option is compatible
only with the [-v] option.
-c Clear the dump, so that future invocations of savecore will
-f Force a dump to be taken even if the dump was cleared.
-k Do not clear the dump after saving it.
-v Print out some additional debugging information.
-z Compress the core dump and kernel (see gzip(1)).
The savecore utility looks for dumps on each device specified by the
device argument(s), or on each device in /etc/fstab marked as ``dump'' or
``swap''. The savecore utility checks the core dump in various ways to
make sure that it is complete. If it passes these checks, it saves the
core image in directory/vmcore.# and information about the core in
directory/info.# 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.
The savecore utility also checks the available disk space before attempting
to make the copies. If there is insufficient disk space in the file
system containing directory, or if the file directory/minfree exists and
the number of free kilobytes (for non-superusers) in the file system
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 initialization
file /etc/rc (see rc(8)).
The minfree code does not consider the effect of compression or sparse
gzip(1), getbootfile(3), dumpon(8), syslogd(8)
The savecore utility appeared in 4.1BSD.
FreeBSD 5.2.1 September 23, 1994 FreeBSD 5.2.1 [ Back ]