LOCKD(NADM)                                UNIX System V



     Name
          lockd - Network lock daemon


     Syntax
          /etc/lockd [ -t timeout ] [ -g graceperiod ] [ -e ]


     Description
          lockd processes lock requests that are either  sent  locally
          by  the  kernel  or  remotely by another lock daemon.  lockd
          forwards lock requests for remote data to the server  site's
          lock   daemon  through  the  RPC/XDR  package.   lockd  then
          requests the status monitor daemon, statd(NADM), for monitor
          service.   The reply to the lock request will not be sent to
          the kernel until the status daemon  and  the  server  site's
          lock  daemon  have replied.  If either the status monitor or
          server site's lock daemon is unavailable,  the  reply  to  a
          lock  request  for  remote data is delayed until all daemons
          become available.

          When a server recovers, it waits for a grace period for  all
          client  site lockds to submit reclaim requests.  Client site
          lockds, on the other hand, are notified by the statd of  the
          server  recovery  and  promptly  resubmit previously granted
          lock requests.  If a lockd  fails  to  secure  a  previously
          granted  lock at the server site, the lockd sends SIGUSR2 to
          a process.

          lockd should be invoked as  early  as  possible  during  the
          transition  from  single user to multiuser, so that no other
          processes have the opportunity to get a  standard  System  V
          lock (See -e option below).


     Options
          -t timeout
                    lockd  uses  timeout  (seconds)  as  the  interval
                    instead  of  the  default  value  (15  seconds) to
                    retransmit lock request to the remote server.

          -g graceperiod
                    lockd uses  graceperiod  (seconds)  as  the  grace
                    period  duration  instead of the default value (45
                    seconds).

          -e        If there are active locks in the  standard  system
                    record  locking  code, lockd will log a warning to
                    the console. If the -e option is specified,  lockd
                    will exit immediately if there are active standard
                    locks. This is so that the administrator  has  the
                    option  of not effectively destroying a processes'
                    locks in progress.


     See Also
          fcntl(S), lockf(S), signal(S), statd(NADM)


(printed 8/17/89)                                       LOCKD(NADM)