[issue21998] asyncio: support fork

[Yury Selivanov]

Yury Selivanov added the comment:

> I don't understand. If the fork fails nothing changes right? I guess I'm missing some context or use case.

Maybe I'm wrong about this.  My line of thoughts is: a failed fork() call is a bug in the program.  Now, the master process will continue operating as it was, no warnings, no errors.  The child process will crash with a RuntimeError exception.  Will it be properly reported/logged?

I guess the forked child will share the stderr, so the exception won't pass completely unnoticed, right?

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<http://bugs.python.org/issue21998>
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