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The NFS network lock manager

The locking protocol

There are four basic kernel-to-lock manager (KLM) requests:


KLM_LOCK
Lock the specified record.

KLM_UNLOCK
Unlock the specified record.

KLM_TEST
Test if the specified record is locked.

KLM_CANCEL
Cancel an outstanding lock request.
Despite the fact that the network lock manager adheres to the lockf and fcntl semantics, there are a few subtle points about its behavior that deserve mention. These arise directly from the nature of the network: For more information about locking, see fcntl(S) and lockf(S).
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SCO OpenServer Release 6.0.0 - 01 June 2005