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.\"	$NetBSD: rpc.lockd.8,v 1.5 2000/06/09 18:51:47 cgd Exp $
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.Dd January 9, 2007
.Dt RPC.LOCKD 8
.Os
.Sh NAME
.Nm rpc.lockd
.Nd NFS file locking daemon
.Sh SYNOPSIS
.Nm
.Op Fl d Ar debug_level
.Op Fl g Ar grace_period
.Op Fl x Ar host_monitor_cache_period
.Sh DESCRIPTION
The
.Nm
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
.Xr rpc.statd 8 .
.Pp
The
.Nm
utility runs whenever its services are needed to support either the
NFS server (see
.Xr 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.
.Nm
will also make sure that the
.Cm statd
service (on which it depends) is running.
.Pp
The following is a list of command line options that are available.
However, since
.Nm
is normally started by
.Xr launchd 8 ,
configuration of these options should be controlled using the equivalent
settings in the NFS configuration file.  See
.Xr nfs.conf 5
for a list of tunable parameters.
.Bl -tag -width indent
.It Fl d
The
.Fl d
option causes debugging information to be written to syslog, recording
all RPC transactions to the daemon.
These messages are logged with level
.Dv LOG_DEBUG
and facility
.Dv LOG_DAEMON .
Specifying a
.Ar 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.
.It Fl g
The
.Fl g
option allows to specify the
.Ar grace period
(in seconds).
During the grace period
.Nm
only accepts requests from hosts which are reinitialising locks which
existed before the server restart.
Default is 45 seconds.
.It Fl x
The
.Fl 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.
.El
.Pp
Error conditions are logged to syslog, irrespective of the debug level,
using log level
.Dv LOG_ERR
and facility
.Dv LOG_DAEMON .
.Pp
.Sh FILES
.Bl -tag -width /usr/include/rpcsvc/nlm_prot.x -compact
.It Pa /var/run/lockd.pid
The pid of the current
.Cm lockd
daemon.
.It Pa /System/Library/LaunchDaemons/com.apple.lockd.plist
The
.Cm lockd
service's property list file for
.Xr launchd 8 .
.It Pa /usr/include/rpcsvc/nlm_prot.x
RPC protocol specification for the network lock manager protocol.
.El
.Sh SEE ALSO
.Xr nfs.conf 5 ,
.Xr rpc.statd 8 ,
.Xr syslog 3 ,
.Xr launchd 8
.Sh BUGS
The current implementation serialises locks requests that could be shared.
.Sh STANDARDS
The implementation is based on the specification in
.Rs
.%B "X/Open CAE Specification C218"
.%T "Protocols for X/Open PC Interworking: XNFS, Issue 4"
.%O ISBN 1 872630 66 9
.Re
.Sh HISTORY
A version of
.Nm
appeared in
.Tn SunOS
4.