SYNOPSIS
#include <curl/curl.h>
CURLMcode curl_multi_setopt(CURLM *handle, CURLMOPT_SOCKETDATA, void *pointer);
DESCRIPTION
A data pointer to pass to the socket callback set with the CURLMOPT_SOCKETFUNCTION(3) option.This pointer will not be touched by libcurl but will only be passed in to the socket callbacks's userp argument.