Click above to get retro games delivered to your door ever month!

lock
====

Syntax
------

     #include <io.h>
     
     int lock(int fd, long offset, long length);

Description
-----------

Locks a region in file FD using MS-DOS file sharing interface.  The
region of LENGTH bytes, starting from OFFSET, will become entirely
inaccessible to other processes. If multiple locks are used on a single
file they must be non-overlapping. The lock must be removed before the
file is closed.

This function will fail unless SHARE, or a network software providing
similar interface, is installed. This function is compatible with
Borland C++ function of the same name.

unlock:.   

Return Value
------------

Zero if successful, nonzero if not.