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Date: Sun, 26 Apr 2020 02:15:22 +0200
From: Wolf <>
Subject: Re: Proposal to match behaviour of gethostbyname to glibc


On 2020-04-17 14:46:40 -0400, Rich Felker wrote:
> Actually now that I'm doing this I'm not sure it's correct. The
> existing code reports all matches from the hosts file, not just the
> first one. This patch will prevent getting both ipv4 and ipv6 results,
> or multiple results for the same address family, by stopping after the
> first one.

Well, I've completely missed that. Sorry.

> If you want the canonical name to come from the first result, rather
> than suppressing all but the first result, the code instead needs to
> be changed to remember that it already found one name and not copy any
> others.

I've attached patch v2 doing exactly that. Hopefully this time it's


There are only two hard things in Computer Science:
cache invalidation, naming things and off-by-one errors.

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