[issue33650] asyncio: Prohibit adding a signal handler for SIGCHLD

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

Some people may have reasons to do that (for example: they write their own subprocess implementation). I suggest emitting a warning rather than forbidding it.

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nosy: +pitrou

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<https://bugs.python.org/issue33650>
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