[issue16500] Allow registering at-fork handlers

[Antoine Pitrou]

Antoine Pitrou added the comment:

> If the corresponding warnings are ignored, nothing happen, if they are errors, the child is exited,

Right now PyOS_AfterFork() doesn't return an error code.  It is not obvious how the caller would react: simply print the error? raise a fatal error? Something else?

The only third-party use of PyOS_AfterFork() I found is in uwsgi (and I'm not sure they're using it correctly, since I don't know if the parent process is using Python at all...).

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16500>
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