[issue20100] epoll docs are not clear with regards to CLOEXEC.

[STINNER Victor]

STINNER Victor added the comment:

Use os.set_inheritable(epoll.fileno(), True) to make the file descriptor
inheritable. You should find this info easily if you follow the link on
"non inheritable" in epoll documentation.

EPOLL_CLOEXEC becomes useless in Python 3.4. It is used internally by
default if available. Removing it would break existing code, it would be
harder to write code for python 3.4 and 3.3.

Just update the doc.

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