[Bug network/14415] AI_V4MAPPED is useless with AI_UNSPEC but they're used together as defaults when hints=NULL

[psimerda at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=14415

--- Comment #3 from Pavel Šimerda <psimerda at redhat dot com> 2012-08-03 16:12:06 UTC ---
> My understanding is that because the default uses AF_UNSPEC that the caller
> accepts *any* address family thus AI_V4MAPPED is not useless because AF_UNSPEC
> can be treated as anything including AF_INET6.

This is not the case. My tests say that AF_UNSPEC with AI_V4MAPPED returns
regular IPv4 addresses, regular IPv6 addresses but *no* IPv4-mapped IPv6
addresses. So it actually behaves exactly like AF_UNSPEC without AI_V4MAPPED.

> Does that clarify why we would set AI_V4MAPPED in the default?

Unfortunately not.

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