Re: Asynchronous certificate verification: busy loop?

On Fri, 8 Aug 2025, Ondra via curl-users wrote:

You might enjoy the curl-library mailing list more, as that focuses on 
libcurl and this list is more curl tool oriented.

> Proper approach how to do this seems to be to use *CURLOPT_SSL_CTX_FUNCTION
> to register custom ctx function from which *SSL_CTX_set_cert_verify_callback
> can be used to register a verify callback.
>
> When this cert_verify_callback is invoked, I obtain the chain of
> certificates and post it for verification. Then I “return
> SSL_set_retry_verify(ssl);” from it.
> This works, however the problem is that the sockets scheduled by multi on
> behalf of this easy are not unscheduled; thus we busy loop until the cert
> verification finishes.

This explanation seems to leave something out. How can libcurl call a callback 
and wait for its return and at the same time run in a busy-loop?

-- 

  / daniel.haxx.se || https://rock-solid.curl.dev

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