which function pass libcurl internal socket (the argument sockfd) to curl_multi_socket_action in libcurl?

[Pahome Chen via curl-library]

I read about the page about curl_multi_socket interface below :

https://curl.haxx.se/libcurl/c/curl_multi_socket_action.html

It's described this function :

curl_multi_socket_action(CURLM * multi_handle,
                                   curl_socket_t sockfd,
                                   int ev_bitmask,
                                   int *running_handles);

where's the 2nd arguments called sockfd from?

Is that from one of libcurl function? the documents doesn't mention it.

-- 
Best Regards,
pahome

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