[issue12797] io.FileIO and io.open should support openat

[Ned Deily]

Ned Deily <nad at acm.org> added the comment:

I believe openat is new to POSIX (mandatory as of POSIX 2008).  For example, it's not currently in OS X and apparently was first added to FreeBSD in 8.0.  So it would have to be checked by configure and documented as platform-dependent.

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nosy: +ned.deily

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