Return to update.8 CVS log

Up to [CSRG BSD Unix] / 43BSDReno / usr.sbin / update

Annotation of 43BSDReno/usr.sbin/update/update.8, revision 1.1.1.1

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.

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.