rpc.lockd

When two machines attempt to read/write the same file, they may come into conflict where one machine will inadvertently overwrite changes made by the other machines. In order to prevent this, files (and regions within files) can be "locked". This helps the two machines coordinate access with each other.

Note that this isn't a security mechanism, because a malicious machine could simply wait until the other machine releases the lock. Instead, it is a coordination/synchronization technique.

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