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The lockd utility is part
of the NFS lock manager, which supports record locking operations on NFS files. See fcntl(2) and lockf(3C). The lock manager provides two functions:
- it forwards fcntl(2) locking requests for NFS mounted file systems to the lock manager on the NFS server
- it generates local file locking operations in response to requests forwarded from lock managers running on NFS client machines.
State information kept by the lock manager about these locking requests can be lost if the lockd is killed or the operating system is rebooted. Some of this information can be recovered as follows. When the server lock manager restarts, it waits for a grace period for all client-site
lock managers to submit reclaim requests. Client-site lock managers, on the other hand, are notified by the status monitor daemon, statd(1M), of the restart and promptly resubmit previously
granted lock requests. If the lock daemon fails to secure a previously granted lock at the server site, then it sends SIGLOST to a process.
Administrators wanting to change startup parameters for lockd should, as root, make changes in the /etc/default/nfs file rather than editing the /etc/init.d/nfs.client file. See nfs(4).
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