[Mono-dev] [Patch] Report an error if src and dest are the same in Copy

[Carlos Alberto Cortez]

Hey,

The attached patch on CopyFile on our io-layer -which is used by
System.IO.File.Copy- check if the source and the destination are the same,
and in that case, report that the file is currently in use, and proceed to
throw an exception. I tried to add this check directly in our C# side, but
then moved the check to our io-layer side so we could take advantage of our
IOMAP capability.

Could anybody with experience in the io-layer review?

Thanks!
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