[issue46454] '0 -> /dev/null' is lost

[licunlong]

licunlong <shenxiaogll at 163.com> added the comment:

But one more question.
Please take a look at fd.py. In this file, we first close fd 0, then open /dev/null as fd_null, and dump fd_null to fd 0. After we fork new process, this fd 0 `is` inherited.
This seems to be a bug?

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nosy: +Geass-LL

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<https://bugs.python.org/issue46454>
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