Small improvements to nio native code (unix)

[Martin Buchholz]

Hi Alan,

I'd like you to do a code review.

Avoid problematic JNI *Critical functions.
Fix rawtypes compile warnings.
Make IOUtil native code more readable.
Rename initPipe to makePipe.
Rename "block" argument to "blocking" for consistency.

http://cr.openjdk.java.net/~martin/webrevs/openjdk7/IOUtil/

Thanks,

Martin
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