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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: ai_flags in calls to getaddrinfo
Date: Fri, 01 Jan 2021 14:50:32 +0200
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To: Lars Ingebrigtsen <larsi@gnus.org>
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> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: emacs-devel@gnu.org
> Date: Fri, 01 Jan 2021 11:59:37 +0100
> 
> I think that when the user asks for ipv6 explicitly, they should get
> back ipv6 (or get nothing/a failure).  If the user has specified the
> protocol, it's presumably because they really want that protocol.

But isn't the return value a valid IPv6 address when using AI_V4MAPPED?

> If they don't specify the protocol version, they get back either/both
> ipv6/ipv4 now (depending on the system), don't they?

On that system, I get only the IPv4 address if I don't use AI_ALL and
AI_V4MAPPED.  If I do use the two flags, I get both IPv4 and IPv6
addresses.