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RPC.LOCKD(8) NetBSD System Manager's Manual RPC.LOCKD(8)
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rpc.lockd -- NFS file locking daemon
rpc.lockd [-46] [-d debug_level] [-g grace_period]
The rpc.lockd daemon 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
Options and operands available for rpc.lockd:
-4 Listen for requests using IPv4. Do not listen using
IPv6 unless the -6 option is also specified. By
default, rpc.lockd listens for requests using both
IPv4 and IPv6 if available.
-6 Listen for requests using IPv6. It is an error if
IPv6 is not available.
-d debug_level Cause debugging information to be written to syslog,
recording all RPC transactions to the daemon. These
messages 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
-g grace_period Set the grace period (in seconds) to grace_period.
During the grace period rpc.lockd only accepts
requests from hosts which are reinitialising locks
which existed before the server restarted. Default is
Error conditions are logged to syslog, irrespective of the debug level,
using log level LOG_ERR and facility LOG_DAEMON.
The rpc.lockd daemon must NOT be invoked by inetd(8) because the protocol
assumes that the daemon will run from system start time. Instead, it
should be configured in rc.conf(5) to run at system startup.
/usr/include/rpcsvc/nlm_prot.x RPC protocol specification for the net-
work lock manager protocol.
syslog(3), rc.conf(5), rpc.statd(8)
The implementation is based on the specification in X/Open CAE Specifica-
tion C218, "Protocols for X/Open PC Interworking: XNFS, Issue 4", ISBN 1
872630 66 9.
A version of rpc.lockd appeared in SunOS 4.
The current implementation provides only the server side of the protocol
(i.e., clients running other OS types can establish locks on a NetBSD
fileserver, but there is currently no means for a NetBSD client to estab-
The current implementation serialises lock requests that could be shared.
NetBSD 9.0 August 11, 2012 NetBSD 9.0