[issue28864] Add devnull file-like object

[Christian Heimes]

Christian Heimes added the comment:

It can be done with some extra effort. We have to get the st_dev and st_inode from os.fstat(fd), cache them together with the fd, and verify them every time we create a new DevNull object. That way we catch both closed fd and modified fd. We might have to add a lock around the check, too.

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nosy: +christian.heimes

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<http://bugs.python.org/issue28864>
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