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Annotation of 43BSDReno/usr.sbin/update/update.8, revision 1.1

1.1     ! root        1: .\"    @(#)update.8    6.2 (Berkeley) 6/24/90
        !             2: .\"
        !             3: .TH UPDATE 8 "June 24, 1990"
        !             4: .AT 3
        !             5: .SH NAME
        !             6: update \- periodically update the super block
        !             7: .SH SYNOPSIS
        !             8: .B update
        !             9: .SH DESCRIPTION
        !            10: .I Update
        !            11: is a program that executes
        !            12: the
        !            13: .IR sync (2)
        !            14: primitive every 30 seconds.
        !            15: This insures that the file system
        !            16: is fairly up to date in case of a crash.
        !            17: This command should not be executed directly,
        !            18: but should be executed out of the
        !            19: initialization shell command file.
        !            20: .SH "SEE ALSO"
        !            21: sync(2), sync(8), init(8), rc(8)
        !            22: .SH BUGS
        !            23: With
        !            24: .I update
        !            25: running,
        !            26: if the CPU is
        !            27: halted just as
        !            28: the
        !            29: .I sync
        !            30: is executed,
        !            31: a file system can be damaged.
        !            32: This is partially due to DEC hardware that
        !            33: writes zeros when NPR requests fail.
        !            34: A fix would be to have
        !            35: .IR sync (8)
        !            36: temporarily increment the system time by at
        !            37: least 30 seconds to trigger the execution of
        !            38: .I update.
        !            39: This would give 30 seconds grace to halt the CPU.

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