[issue16500] Add an 'atfork' module

[Antoine Pitrou]

Antoine Pitrou added the comment:

I've posted https://github.com/python/cpython/pull/1715 which adds a single `os.register_at_fork` function to allow registering at-fork handlers.  Comments welcome.

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stage:  -> patch review
versions: +Python 3.7 -Python 3.5

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