CURLOPT_SOCKOPTDATA - custom pointer to pass to sockopt callback
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SOCKOPTDATA, void *pointer);
Pass a pointer that will be untouched by libcurl and passed as the first argument in the sockopt callback set with CURLOPT_SOCKOPTFUNCTION.
The default value of this parameter is NULL.
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
CURLOPT_SOCKOPTFUNCTION CURLOPT_OPENSOCKETFUNCTION
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