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Re: Asynchronous DNS

From: Lars Magne Ingebrigtsen
Subject: Re: Asynchronous DNS
Date: Sun, 24 Jan 2016 14:53:33 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1.50 (gnu/linux)

Paul Eggert <address@hidden> writes:

> Lars Magne Ingebrigtsen wrote:
>> 2) Use one of the newer async C resolver libraries.  This would not be
>> available on all platforms, and would be Yet Another Dependency which
>> I'm sure everybody would rather that we avoid.
> Nevertheless, this sounds like the most promising approach. Why
> reinvent the wheel? Platforms lacking the library will be no worse off
> than they are now.
> Do you consider GNU adns to be one of the "newer" libraries? If not,
> what problems do you see with GNU adns?

I haven't looked closely at any of the asynchronous C libraries, because
I assumed that it was off the table.  But if it's fine to add another
(optional) C library to the Emacs build, then I'm up for investigating
further and taking a stab at implementing it.

The most well-distributed C-level libraries for async DNS seem to be
adns, c-ares and firedns, at least on Linux systems.  adns has no
documentation, but has a very well-commented C header file, and looks,
at first blush, to provide a sane interface.

firedns looks pretty abandoned.  c-ares seems sane and has


udns seems even better:  http://www.corpit.ru/mjt/udns.html
Unfortunately, it doesn't look like it's available on Debian, for
instance, which limits its practicality.

I have no experience with either of these libraries in practice...
Anybody have any input here?

(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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