What part of Cygwin API code handles raw device access?

[Richard H. Gumpertz]

> I'm interested in writing an MSDOS 16-bit tool that behaves
> exactly like the UNIX dd, and has access to raw devices
> (both floppy and hard disk).  I imagine that I might be able
> to adapt some of the 32-bit Cygwin32 code, or at least learn
> from it.  If somebody could point me to the right portion of
> the cygwin32 b-19.1 code that handles the /dev/fd0 raw 
> device access, I would be very grateful.  

If money is not a major issue, the MKS toolkit for DOS includes exactly what
you are looking for...

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