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RE: [EXTERNAL] Re: Feature request: provide ability to set a global callback function telling libcurl if IPv6 works on the system

From: Daniel Stenberg via curl-library <>
Date: Thu, 22 Sep 2022 23:47:18 +0200 (CEST)

On Thu, 22 Sep 2022, Dmitry Karpov via curl-library wrote:

> That's right. I don't think that it is possible to change the
> Curl_ipv6works() implementation that it will work the same way with zero
> delays for ALL possible kernels/network configurations. And it is not
> possible to change all kernels where some curl application may run to make
> Curl_ipv6works() return false with 0ms delay when there are some issues with
> IPv6 on kernel levels.

What I cannot understand is how you can implement a working callback for this
purpose, called when the connection is to setup, but you cannot set an easy
option, done just before the connection is about to get setup.

Why would one work and not the other?

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Received on 2022-09-22