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28 .\" From: @(#)savecore.8 8.1 (Berkeley) 6/5/93
36 .Nd "save a core dump of the operating system"
43 .Op Ar directory device
46 .Op Ar directory Op Ar device ...
51 copies a core dump into
53 or the current working directory if no
56 and enters a reboot message and information about the core dump into
59 The options are as follows:
60 .Bl -tag -width indent
62 Check to see if a dump exists,
63 and display a brief message to indicate the status.
64 An exit status of 0 indicates that a dump is there,
65 1 indicates that none exists.
66 This option is compatible only with the
70 Clear the dump, so that future invocations of
74 Force a dump to be taken even if either the dump was cleared or if the
75 dump header information is inconsistent.
77 Do not clear the dump after saving it.
79 Print out some additional debugging information.
80 Specify twice for more information.
82 Compress the core dump and kernel (see
89 looks for dumps on each device specified by the
91 argument(s), or on each device in
100 checks the core dump in various ways to make sure that it is complete.
101 If it passes these checks, it saves the core image in
102 .Ar directory Ns Pa /vmcore.#
103 and information about the core in
104 .Ar directory Ns Pa /info.#
105 For kernel textdumps generated with the
107 facility, output will be stored in the
110 .Ar director Ns Pa /textdump.tar.#
111 The ``#'' is the number from the first line of the file
112 .Ar directory Ns Pa /bounds ,
113 and it is incremented and stored back into the file each time
120 also checks the available disk space before attempting to make the copies.
121 If there is insufficient disk space in the file system containing
124 .Ar directory Ns Pa /minfree
125 exists and the number of free kilobytes (for non-superusers) in the
126 file system after the copies were made would be less than the number
127 in the first line of this file, the copies are not attempted.
131 successfully copies the kernel and the core dump, the core dump is cleared
132 so that future invocations of
139 is meant to be called near the end of the initialization file
156 Support for kernel textdumps appeared in
159 The minfree code does not consider the effect of compression or sparse files.