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The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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  Include:   <io.h>, <sys\locking.h>, <errno.h>
 
  Syntax:    int locking( int handle, int mode, long nbytes );
             mode: LK_LOCK, LK_NBLCK, LK_NBRLCK, LK_RLCK, LK_UNLCK
 
  Returns:   0 if successful, or -1 if not.
             errno: EACCES, EBADF, EDEADLOCK, EINVAL
 
  See also:  creat, open
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