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TIMESYNC(8)                 System Manager's Manual                TIMESYNC(8)



NAME
       timesync - synchronize the system clock to a time source

SYNOPSIS
       aux/timesync [ -a accuracy ] [ -S stratum ] [ -s netroot ] [ -frnDdLilG
       ] [ timeserver ]

DESCRIPTION
       Aux/timesync synchronizes the system clock to a time source, by default
       a file server.  The options are:

       -f     synchronize  to  a  file  server.  If timeserver is missing, use
              /srv/boot.

       -r     synchronize to the local real time clock, #r/rtc.

       -L     used with -r to indicate the real time clock is  in  local  time
              rather  than  GMT.  This is useful on PCs that also run the Win‐
              dows OS.

       -n     synchronize to an NTP server.  If timeserver  is  missing,  dial
              the server udp!$ntp!ntp.

       -D     print debugging to standard error

       -d     put file containing last determined clock frequency in directory
              dir, default /tmp.

       -i     stands for impotent.  Timesync announces what it  would  do  but
              doesn't  do  it.   This  is  useful  for tracking alternate time
              sources.

       -a     specifies the accuracy in nanoseconds to which the clock  should
              be  synchronized.  This determines how often the reference clock
              is accessed.

       -G     causes timesync to use a gps server (see  gpsfs(8))  as  a  time
              source.

       -s     causes  timesync  to  listen for UDP NTP requests on the network
              rooted at netroot.  Up to 4 -s options are allowed.

       -S     sets the stratum number to stratum.

       -l     turns on logging to /sys/log/timesync.

FILES
       /tmp/ts.<sysname>.<type>.timeserver
              where the last frequency guess is kept

       /sys/log/timesync
              log file

SOURCE
       /sys/src/cmd/aux/timesync.c

BUGS
       Only works with IPv4.



                                                                   TIMESYNC(8)