HelpPC 2.10 Quick Reference Utility Copyright 1991 David Jurgens

            TC: int unlock( int handle, long offset, long length )

       - prototype in io.h

       - unlock() removes locks placed on a file region by lock()
       - returns 0 on success, else -1 on error
       - all locks must be released before program termination
       - MS C uses locking()
       - see   lock C

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