key64_t? ino64_t?

Corinna Vinschen
Thu May 15 11:19:00 GMT 2003

On Thu, May 15, 2003 at 09:54:05AM +1000, Robert Collins wrote:
> And my copy of P1003.1 says:
> "The ftok() function shall return the same key value for all paths that
> name the same file, when called with the same id value, and return
> different key values when called with different id values or with paths
> that name differnet files existing on the same file system at the same
> time."
> Key things to note: sus doesn't require uniqueness across file systems 
> - but it's a good idea if we can do that for low or no extra cost/
> It *does* require uniqueness within a file system.

So it's a matter of using the 64 bit sensible.  What about

  8 bit low byte of device minor number.
  16 bits high word of nFileIndexHigh
  32 bits nFileIndexLow
  8 bit id


Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Developer                      
Red Hat, Inc.

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