Accessing the UNIX file descriptor inside an fstream

[Mark Mitchell]

> Chris is right, people do need this functionality and it doesn't serve
> our users to deny them it on pedantic conformance issues.

I agree.  On UNIX-like systems, there should be a way to get a file
descriptor from an stream, in the cases where there really is an
underlying descriptor.

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Mark Mitchell                   mark@codesourcery.com
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