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lockd

lockd(8c) lockd(8c)

Name
lockd - network lock daemon

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

Description
The daemon processes lock requests that are either sent locally by the kernel or remotely by another lock daemon. The NFS locking service
makes this advisory locking support possible by using the system call and the subroutine. The daemon forwards lock requests for remote
data to the server site's lock daemon. The daemon then requests the status monitor daemon, for monitor service. The reply to the lock
request is not 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 daemons to submit reclaim requests. Client site daemons are noti-
fied by of the server recovery and promptly resubmit previously granted lock requests. If a client site's daemon fails to secure previ-
ously granted locks at the server site, the daemon sends the signal SIGLOST to all the processes that were previously holding locks and
cannot reclaim them.

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

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

See Also
fcntl(2), lockf(3), signal(3), statd(8c)

lockd(8c)