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Re: [v6ops] An Update to Happy Eyeballs

David Schinazi <dschinazi@apple.com> Mon, 13 March 2017 18:13 UTC

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From: David Schinazi <dschinazi@apple.com>
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Date: Mon, 13 Mar 2017 11:13:51 -0700
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To: Philip Homburg <pch-v6ops-6@u-1.phicoh.com>
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Cc: v6ops@ietf.org
Subject: Re: [v6ops] An Update to Happy Eyeballs
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Phillip,

By design, Happy Eyeballs cannot be implemented using blocking
networking calls in a single-threaded C program, as it involves
racing parallel operations. DNS is no different than TCP in this regard.

If an implementation wants to be compliant with this specification,
they'll need to support asynchronous networking. If an implementation
has limitations that prevent it from being compliant, that is fine,
you don't need to support all RFCs to connect your code to the Internet.

If there is consensus in the working group to relax the requirements
language in this document, we're absolutely open to that. But I don't
believe we should restrict ourselves to getaddrinfo() or any API for
that matter.

David


> On Mar 13, 2017, at 05:49, Philip Homburg <pch-v6ops-6@u-1.phicoh.com> wrote:
> 
>> 
>>   We've incorporated them into -01, please let us know if they
>>   were properly addressed.
> 
> In my opinion, there is no justification for declaring a single threaded
> C application that uses getaddrinfo non-compliant.
> 
> So this draft doesn't address my concerns. Just calling getaddrinfo should
> be enough. 
>

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