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sockopt
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sockopt
The sockopt callback is set with CURLOPT_SOCKOPTFUNCTION:
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curl_easy_setopt(handle, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
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The sockopt_callback function must match this prototype:
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int sockopt_callback(void *clientp,
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curl_socket_t curlfd,
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curlsocktype purpose);
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This callback function gets called by libcurl when a new socket has been created but before the connect call, to allow applications to change specific socket options.
The clientp pointer points to the private data set with CURLOPT_SOCKOPTDATA:
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curl_easy_setopt(handle, CURLOPT_SOCKOPTDATA, custom_pointer);
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This callback should return:
    CURL_SOCKOPT_OK on success
    CURL_SOCKOPT_ERROR to signal an unrecoverable error to libcurl
    CURL_SOCKOPT_ALREADY_CONNECTED to signal success but also that the socket is
    in fact already connected to the destination
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