NAME

in.timed, timed − time server daemon

SYNOPSIS

/usr/sbin/in.timed [ −t ] [ −M ] [ −n network ] [ −i network ]

DESCRIPTION

The in.timed command is the time daemon server which supports the DARPA Time Server Protocol.  Normally, in.timed will be invoked at boot time from a startup script (which is a link to /etc/init.d/timed) located in /etc/rc2.d.  in.timed will synchronize the host’s time with the time of other machines in a local area network running in.timed.  These time servers will slow down the clocks of some machines and speed up the clocks of others to bring them to the average network time.  The average network time is computed from measurements of clock differences using the ICMP timestamp request message. 

The service provided by in.timed is based on a master-slave scheme.  When in.timed is started on a machine, it asks the master for the network time and sets the host’s clock to that time.  After that, it accepts synchronization messages sent periodically by the master and calls adjtime(2) to perform the needed corrections on the host’s clock. 

It also communicates with date(1) in order to set the date globally, as well as with timedc(1M), an in.timed control program.  If the machine running the master crashes, the slaves will elect a new master from among the slaves running with the −M flag.  An in.timed running without the −M flag will remain a slave.  The −t flag enables in.timed to trace the messages it receives in the file /var/log/timed.log.  Tracing can be turned on or off by the program timedc(1M). 

Normally, in.timed checks for a master time server on each network to which it is connected, except as modified by the options described below.  It will request synchronization service from the first master server located.  If permitted by the −M flag, it will provide synchronization service on any attached networks on which no current master server was detected.  Such a server propagates the time computed by the top-level master. 

The −n flag, followed by the name of a network to which the host is connected [see networks(4)], will override the default choice of the network addresses made by the program.  Whenever the −n flag appears, that network name will be added to a list of valid networks.  All other networks will be ignored by the time daemon. 

The −i  flag, followed by the name of a network to which the host is connected [see networks(4)], will override the default choice of the network addresses made by the program.  Whenever the −i flag appears, that network name will be added to a list of networks to ignore.  All other networks will be used by the time daemon.  NOTE:  The −n and −i flags will be meaningless if used together. 

Network interfaces specified in /etc/if.ignore [see if.ignore(4)] will also be ignored by in.timed. 

FILES

/etc/timed.pid
/etc/if.ignore
/var/adm/timed.masterlog log file for master in.timed
/var/log/timed.logSystem V tracing file for in.timed
/usr/adm/timed.logBSD tracing file for in.timed

SEE ALSO

date(1), timedc(1M), adjtime(2), gettimeofday(3), if.ignore(4), timednet.conf(4), icmp(7)