RPC.LOCKD(8)              BSD System Manager's Manual             RPC.LOCKD(8)

NAME
     rpc.lockd -- NFS file locking daemon

SYNOPSIS
     rpc.lockd [-d debug_level] [-g grace_period]
               [-x host_monitor_cache_period]

DESCRIPTION
     The rpc.lockd utility provides monitored and unmonitored file and record
     locking services in an NFS environment.  To monitor the status of hosts
     requesting locks, the locking daemon typically operates in conjunction
     with rpc.statd(8).

     The rpc.lockd utility runs whenever its services are needed to support
     either the NFS server (see nfsd(8)) or the NFS client (an NFS file system
     on which file locking requests have been made).  The daemon will remain
     running until a short time after its services are no longer needed to
     support either the NFS client or NFS server.  rpc.lockd will also make
     sure that the statd service (on which it depends) is running.

     The following is a list of command line options that are available.  How-
     ever, since rpc.lockd is normally started by launchd(8), configuration of
     these options should be controlled using the equivalent settings in the
     NFS configuration file.  See nfs.conf(5) for a list of tunable parame-
     ters.

     -d      The -d option causes debugging information to be written to sys-
             log, recording all RPC transactions to the daemon.  These mes-
             sages are logged with level LOG_DEBUG and facility LOG_DAEMON.
             Specifying a debug_level of 1 results in the generation of one
             log line per protocol operation.  Higher debug levels can be
             specified, causing display of operation arguments and internal
             operations of the daemon.

     -g      The -g option allows to specify the grace period (in seconds).
             During the grace period rpc.lockd only accepts requests from
             hosts which are reinitialising locks which existed before the
             server restart.  Default is 45 seconds.

     -x      The -x option tells rpc.lockd how long to cache state records for
             monitored hosts.  Setting it to zero will disable the cache which
             will make lock and unlock requests from a single client more
             expensive because of additional interaction with the client's
             statd.  The default cache time is 60 seconds.

     Error conditions are logged to syslog, irrespective of the debug level,
     using log level LOG_ERR and facility LOG_DAEMON.

FILES
     /var/run/lockd.pid              The pid of the current lockd daemon.
     /System/Library/LaunchDaemons/com.apple.lockd.plist
                                     The lockd service's property list file
                                     for launchd(8).
     /usr/include/rpcsvc/nlm_prot.x  RPC protocol specification for the net-
                                     work lock manager protocol.

SEE ALSO
     nfs.conf(5), rpc.statd(8), syslog(3), launchd(8)

BUGS
     The current implementation serialises locks requests that could be
     shared.

STANDARDS
     The implementation is based on the specification in "Protocols for X/Open
     PC Interworking: XNFS, Issue 4", X/Open CAE Specification C218, ISBN 1
     872630 66 9.

HISTORY
     A version of rpc.lockd appeared in SunOS 4.

BSD                             January 9, 2007                            BSD