Re: ai_flags in calls to getaddrinfo, broader call for reproducibility check

[Eli Zaretskii]

> From: Robert Pluim <rpluim@gmail.com>
> Cc: rtt@dasyatidae.com,  emacs-devel@gnu.org
> Date: Tue, 12 Jan 2021 17:00:56 +0100
> 
> >   (dns-query "google.com" 'AAAA)
> >     => "2a00:1450:4009:80b:0:0:0:200e"
> >
> > So I'm not sure that test is reliable enough for these purposes.
> 
> Itʼs checking if IPv6 names can be resolved, not if IPv6 works. If you
> think thatʼs not a useful test, we can remove it.

No, feel free to ignore me.  I was just surprised it worked, that's
all.

> I can condition all the IPv6 tests on the following, which should
> alleviate your concerns:
> 
> ;; This will need updating when IANA assign more IPv6 global ranges.
> (defun ipv6-is-available ()
>   (and (featurep 'make-network-process '(:family ipv6))
>        (cl-rassoc-if
>         (lambda (elt)
>           (and (eq 9 (length elt))
>                (= (logand (aref elt 0) #xe000) #x2000)))
>         (network-interface-list))))

Thanks, that would be good, I think.