ref: d8999511e0921e2aaa45f862c5b4ca9098d78a96
dir: /sys/man/8/timesync/
.TH TIMESYNC 8 .SH NAME timesync \- synchronize the system clock to a time source .SH SYNOPSIS .B aux/timesync [ .B -a .I accuracy ] [ .B -S .I stratum ] [ .B -s .I netroot ] [ .B -frnDdLilG ] [ .I timeserver ] .SH DESCRIPTION .B Aux/timesync synchronizes the system clock to a time source, by default a file server. The options are: .TP .B -f synchronize to a file server. If .I timeserver is missing, use .BR /srv/boot . .TP .B -r synchronize to the local real time clock, .BR #r/rtc . .TP .B -L used with .B -r to indicate the real time clock is in local time rather than GMT. This is useful on PCs that also run the Windows OS. .TP .B -n synchronize to an NTP server. If .I timeserver is missing, dial the server .BR udp!$ntp!ntp . .TP .B -D print debugging to standard error .TP .B -d put file containing last determined clock frequency in directory .IR dir , default .BR /tmp . .TP .B -i stands for impotent. .I Timesync announces what it would do but doesn't do it. This is useful for tracking alternate time sources. .TP .B -a specifies the .I accuracy in nanoseconds to which the clock should be synchronized. This determines how often the reference clock is accessed. .TP .B -G causes .I timesync to use a gps server (see .IR gpsfs (8)) as a time source. .TP .B -s causes .I timesync to listen for UDP NTP requests on the network rooted at .IR netroot . Up to 4 .B -s options are allowed. .TP .B -S sets the stratum number to .IR stratum . .TP .B -l turns on logging to .BR /sys/log/timesync . .SH FILES .TF /tmp/ts.<sysname>.<type>.timeserver .TP .B /tmp/ts.<sysname>.<type>.timeserver where the last frequency guess is kept .TP .B /sys/log/timesync log file .SH SOURCE .B /sys/src/cmd/aux/timesync.c