[issue26343] os.O_CLOEXEC not available on OS X

[STINNER Victor]

STINNER Victor added the comment:

FYI Python creates non-inheritable file descriptors by default since Python 3.4: PEP 446.

See also the PEP 433 which has more information on OS support, especially:
https://www.python.org/dev/peps/pep-0433/#atomic-flags

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nosy: +haypo

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