[issue38888] Popen should use pidfd_create to implement a non-busy wait

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

os.pidfd_open() was added to Python 3.9. Do you mean pidfd_open()?

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nosy: +vstinner

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38888>
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