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Annotation of researchv10dc/man/man8/savecore.8, revision 1.1

1.1     ! root        1: .TH SAVECORE 8
        !             2: .CT 1 sa_auto
        !             3: .SH NAME
        !             4: savecore \- save a core image of the operating system
        !             5: .SH SYNOPSIS
        !             6: .B /etc/savecore
        !             7: .I target
        !             8: .I dump
        !             9: .SH DESCRIPTION
        !            10: .I Savecore
        !            11: copies the core image
        !            12: saved after an operating system crash
        !            13: to an ordinary file.
        !            14: This is worth doing
        !            15: so that the crash image will not be overwritten
        !            16: immediately by another crash,
        !            17: or sometimes because the crash image was written
        !            18: in a place where normal system operation will overwrite it
        !            19: (e.g. in the swap area).
        !            20: .PP
        !            21: The crash image is taken from
        !            22: .I dump
        !            23: and written to
        !            24: .IR target .
        !            25: If
        !            26: .I target
        !            27: exists and is a directory,
        !            28: the image is copied to
        !            29: a file in that directory
        !            30: with the first nonexistent name
        !            31: in the sequence
        !            32: .BR "z.0 z.1 z.2 ..." ;
        !            33: otherwise
        !            34: .I target
        !            35: is created or overwritten.
        !            36: .PP
        !            37: The crash image to be copied
        !            38: is checked for a magic number
        !            39: in a known location.
        !            40: If the magic number is correct,
        !            41: it is followed by the size of the image,
        !            42: and the time it was written;
        !            43: these numbers are printed
        !            44: before the dump is copied.
        !            45: If the magic number is wrong,
        !            46: the image is not copied.
        !            47: .I Savecore
        !            48: overwrites the magic number in
        !            49: .I dump
        !            50: after a successful copy.
        !            51: .PP
        !            52: The program runs faster
        !            53: if
        !            54: .I dump
        !            55: is the raw device.
        !            56: .PP
        !            57: For compatibility with an older program of the same name,
        !            58: the
        !            59: .I dump
        !            60: argument may be omitted;
        !            61: .I savecore
        !            62: will noisily examine each device specified for swapping in
        !            63: .IR fstab (5)
        !            64: and each of several popular default swap devices
        !            65: for a valid magic number.
        !            66: The first device that looks right
        !            67: is taken to be the crash image.
        !            68: .PP
        !            69: .I Savecore
        !            70: is usually called when the system is booted,
        !            71: from
        !            72: .IR rc (8).
        !            73: .SH EXAMPLE
        !            74: .EX
        !            75: /etc/savecore /tmp/dump /dev/rra11
        !            76: .EE
        !            77: .SH SEE ALSO
        !            78: .IR reboot (8)
        !            79: .SH BUGS
        !            80: The argument convention
        !            81: (the file to be written comes first)
        !            82: is unfortunate;
        !            83: it stems from compatibility.

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