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Annotation of cci/usr/src/man/man8/update.8, revision 1.1.1.1

1.1       root        1: .TH UPDATE 8  "4 February 1983"
                      2: .SH NAME
                      3: update \- periodically update the super block
                      4: .SH SYNOPSIS
                      5: .B /etc/update
                      6: .SH DESCRIPTION
                      7: .I Update
                      8: is a program that executes
                      9: the
                     10: .IR sync (2)
                     11: primitive every 30 seconds.
                     12: This insures that the file system
                     13: is fairly up to date in case of a crash.
                     14: This command should not be executed directly,
                     15: but should be executed out of the
                     16: initialization shell command file.
                     17: .SH "SEE ALSO"
                     18: sync(2), sync(8), init(8), rc(8)
                     19: .SH BUGS
                     20: With
                     21: .I update
                     22: running,
                     23: if the CPU is
                     24: halted just as
                     25: the
                     26: .I sync
                     27: is executed,
                     28: a file system can be damaged.
                     29: This is partially due to DEC hardware that
                     30: writes zeros when NPR requests fail.
                     31: A fix would be to have
                     32: .IR sync (8)
                     33: temporarily increment the system time by at
                     34: least 30 seconds to trigger the execution of
                     35: .I update.
                     36: This would give 30 seconds grace to halt the CPU.

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