Support FileStream.Length for block devices on Linux #41
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I noticed that opening block devices (such as 'dev/sr0' for a CD-ROM) using FileStream, the length of the stream is always indicated as Zero bytes - even though it is possible to read from the stream. Seek with SeekOrigin.End also doesn't work properly.
This change causes FileStream.Length to return the length of the content of block devices. The change is specific to Linux - I've guarded the change, so that on other platforms this should be a no-op.