[issue38692] add a pidfd child process watcher

[Benjamin Peterson]

Benjamin Peterson <benjamin at python.org> added the comment:

We should not claim to support running our tests in weird syscall sandboxes. There's an infinite number of possible sandboxing configurations, and we can't fix them all.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38692>
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