On Fri, 21 Feb 2025, Niall O'Reilly wrote:
I wonder whether you've considered res_nquery(), the non-blocking successor
to res_query()? I see it in glibc; I haven't looked in Apple or BSD land.
Building without having to install an extra package (such as c-ares) might
be attractive. Perhaps there are disadvantages?
Is it really non-blocking? The docs I've read does not seem to say so.
There are (other) significant drawbacks with using this API: primarily that it
is limited to just a small subset of platforms. It does not even exist on
Windows or macOS and it's broken on Android etc. We would have to use a wide
range of different native APIs to cover just the most commonly used OSes - way
more work than just making sure that a solid DNS library like c-ares is used
instead.
Mozilla took the "native API" route, and Valentin Gosu's talk from this year's
FOSDEM provides reasons enough for me to avoid selecting this approach:
"getaddrinfo sucks, everything else is much worse"
The video recording is here:
https://video.fosdem.org/2025/h2213/fosdem-2025-4229-getaddrinfo-sucks-everything-else-is-much-worse.mp4
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