[Rpm-maint] [rpm-software-management/rpm] treat 0 as valid file descriptor (PR #1891)

[Demi Marie Obenour]

> I meet this problem because we use gunicorn and flask to test rpm. It seems that gunicorn will close stdin during testing (not know why and how for now). Since rpm treats 0 as valid descriptor in many other places, I see no reason why not here.

That’s a gunicorn bug; it should point stdin at `/dev/null` instead.  Otherwise programs risk having stdin point to a random file.

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