Christian Heimes added the comment:

Do you mean #12105? I didn't know about the ticket before.

How about two options, like 'e' for guaranteed atomic CLOEXEC and 'E' for 
CLOEXEC with or without atomic ops? It's not much additional work and lowers 
the burden on the user.

It's going to be hard to get a list of platforms and versions where O_CLOEXEC 
is supported. We should go for a white list approach and only enable it on 
platforms that are either documented to support it or have been tested.

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<http://bugs.python.org/issue16850>
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