POSIX_LOCK_FILE - Online Linux Manual PageSection : 9
Updated : June 2018
Source : Kernel Hackers Manual 2​.6​.
Note : The Linux VFS

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NAMEposix_lock_file − Apply a POSIX−style lock to a file

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SYNOPSISint posix_lock_file(struct file * filp, struct file_lock * fl, struct file_lock * conflock);

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ARGUMENTSfilp The file to apply the lock to fl The lock to be applied conflock Place to return a copy of the conflicting lock, if found​.

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DESCRIPTIONAdd a POSIX style lock to a file​. We merge adjacent & overlapping locks whenever possible​. POSIX locks are sorted by owner task, then by starting address Note that if called with an FL_EXISTS argument, the caller may determine whether or not a lock was successfully freed by testing the return value for −ENOENT​.

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