[issue38692] add a pidfd child process watcher

[STINNER Victor]

STINNER Victor <vstinner 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.

There is no request to support an "an infinite number of possible sandboxing configurations". Only to skip the test if the syscall fails with EPERM. That sounds reasonable to me.

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