TIMED(ADMN)                                UNIX System V



     Name
          timed - time server daemon


     Syntax
          /etc/timed [ -t ] [ -M ] [ -n network ] [ -i network ]


     Description
          timed is the time server daemon and is normally  invoked  at
          boot  time  from  the  STREAMS  TCP/IP  start-up script.  It
          synchronizes the host's time with that of other machines  in
          a  local  area  network  running  timed(ADMN).   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 timed is based   on  a  master-slave
          scheme.   When  timed(ADMN) 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
          periodically sent by the master and  calls  adjtime(SSC)  to
          perform the needed corrections on the host's clock.

          It also communicates with rdate(ADMN) in order  to  set  the
          date  globally,  and  with  timedc(ADMN),  a  timed  control
          program.  If the machine running the  master  crashes,  then
          the slaves will elect a new master from among slaves running
          with the -M flag.  A timed running without the -M flag  will
          remain  a  slave.   The  -t  flag enables timed to trace the
          messages  it  receives  in  the   file   /usr/adm/timed.log.
          Tracing can be turned on or off by the program timedc(ADMN).
          timed normally 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(SFF)),
          overrides  the  default choice of the network addresses made
          by the program.  Each time the -n flag appears, that network
          name  is  added  to  a  list  of  valid networks.  All other
          networks are ignored.  The -i flag, followed by the name  of
          a   network   to   which   the   host   is   connected  (see
          networks(SFF)), overrides the default choice of the  network
          addresses  made  by  the  program.   Each  time  the -i flag
          appears, that network name is added to a list of networks to
          ignore.   All  other  networks  are used by the time daemon.
          The -n and -i flags are meaningless if used together.


     Files
          /usr/adm/timed.log           tracing file for timed
          /usr/adm/timed.masterlog     log file for master timed


     See Also
          date(C),   adjtime(SSC),   gettimeofday(SLIB),   icmp(ADMP),
          rdate(ADMN), timedc(ADMN).


     (printed 8/17/89)                                  TIMED(ADMN)