Online HelpPC 2.10      Quick Reference Utility     Copyright 1991 David Jurgens

 
            TC: int lock( int handle, long offset, long length )            
                                                                                
                                                                                
        - prototype in io.h                                                     
                                                                                
        - locks arbitrary, non-overlapping regions of any file (DOS 3.X),       
          preventing reads/writes to those regions                              
        - returns 0 on success, else -1 on error                                
        - all locks must be released before program termination                 
        - MS C uses locking()                                                   
        - see   unlock()                                                        
                                                                                
 

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