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

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

Here is my quick review:
- shouldn't the opener also get the third open() argument (although it currently seems to always be 0o666)?
- when fdobj is NULL, you shouldn't override the original error
- PyLong_AsLong can fail (if the opener returns too large an int), you should check for that

Thank you!

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue12797>
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