[PATCH v2] Ensure standard file descriptors are open on start

[Arsen Arsenović]

Excuse me, I sent this message, by mistake, to Paul directly, without CCing the
mailing list. To further discussion, I am reposting this. I'm sorry for the
inconvenience:

> I agree they should be open. But it's better for FD 0 to be write-only and
> FDs 1+2 to be read-only, as that's more likely to prevent buggy programs
> from misbehaving further.
Since I agree with this too, we have an agreement on what should happen(?):
1) update comments in the patch to be more specific
2) ensure "wrong direction" opens are used to detect errors (like they were
   originally)

I can do this tomorrow in spare time, if that is what the team sees as the
right thing to do. I'm waiting for further comments in case I missed something.

-- 
Arsen Arsenović
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