fcntl_getlease (9) - Linux Manuals

fcntl_getlease: Enquire what lease is currently active

Command to display fcntl_getlease manual in Linux: $ man 9 fcntl_getlease

fcntl_getlease - Enquire what lease is currently active

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The value returned by this function will be one of (if no lease break is pending):

F_RDLCK to indicate a shared lease is held.

F_WRLCK to indicate an exclusive lease is held.

F_UNLCK to indicate no lease is held.

(if a lease break is pending):

F_RDLCK to indicate an exclusive lease needs to be changed to a shared lease (or removed).

F_UNLCK to indicate the lease needs to be removed.

XXX: sfr & willy disagree over whether F_INPROGRESS should be returned to userspace.