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32 .\" From: @(#)savecore.8 8.1 (Berkeley) 6/5/93
33 .\" $FreeBSD: src/sbin/savecore/savecore.8,v 1.8.2.6 2002/06/20 23:09:09 charnier Exp $
34 .\" $DragonFly: src/sbin/savecore/savecore.8,v 1.6 2006/03/27 16:45:44 swildner Exp $
36 .Dd September 23, 1994
41 .Nd "save a core dump of the operating system"
55 copies the currently running kernel and its associated core dump into
57 and enters a reboot message and information about the core dump into
60 The options are as follows:
61 .Bl -tag -width indent
63 Clear the dump, so that future invocations of
67 Force a dump to be taken even if the dump doesn't appear correct or there
68 is insufficient disk space.
70 Do not clear the dump after saving it.
74 as the kernel instead of the running kernel (as determined from
77 Specify physical memory size used at dumptime (cf. the
79 kernel environment variable).
81 Specify offset of dump in blocks (as printed at dumptime).
83 Print out some additional debugging information.
85 Compress the core dump and kernel (see
92 checks the core dump in various ways to make sure that it is current and
93 that it corresponds to the currently running system.
94 If it passes these checks, it saves the core image in
95 .Ar directory Ns Pa /vmcore.#
97 .Ar directory Ns Pa /kernel.#
98 The ``#'' is the number from the first line of the file
99 .Ar directory Ns Pa /bounds ,
100 and it is incremented and stored back into the file each time
107 also checks the available disk space before attempting to make the copies.
108 If there is insufficient disk space in the filesystem containing
111 .Ar directory Ns Pa /minfree
112 exists and the number of free kilobytes (for non-superusers) in the
113 filesystem after the copies were made would be less than the number
114 in the first line of this file, the copies are not attempted.
118 successfully copies the kernel and the core dump, the core dump is cleared
119 so that future invocations of
126 is meant to be called near the end of the initialization file
142 The minfree code does not consider the effect of compression.