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Date: Mon, 24 Aug 2020 23:51:52 +0200
From: Daniel Neri <>
Subject: Re: Incompatible behaviour of res_query(3) w.r.t. NXDOMAIN

On 24 Aug 2020, at 23:32, Rich Felker <> wrote:
> Does such a distinction exist? I thought res_query was just equivalent
> to res_mkquery+res_send and that calling res_send directly would get
> you the same errors.

I thought so too, but I’ve been reading the musl implementation. ;-)

After looking more at the other implementations, I think Florian is correct though: it’s more like res_mkquery+res_send+setting h_errno and the return value based on the RCODE of the response.


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