NAME

       CURLOPT_SOCKOPTDATA - custom pointer to pass to sockopt callback

SYNOPSIS

       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SOCKOPTDATA, void *pointer);

DESCRIPTION

       Pass  a  pointer that will be untouched by libcurl and passed as the first argument in the
       sockopt callback set with CURLOPT_SOCKOPTFUNCTION(3).

DEFAULT

       The default value of this parameter is NULL.

PROTOCOLS

       All

EXAMPLE

       static int sockopt_callback(void *clientp, curl_socket_t curlfd,
                                   curlsocktype purpose)
       {
         int val = *(int *)clientp;
         setsockopt(curldfd, SOL_SOCKET, SO_RCVBUF, (const char *)&val, sizeof(val));
         return CURL_SOCKOPT_OK;
       }

       curl = curl_easy_init();
       if(curl) {
         int recvbuffersize = 256 * 1024;

         curl_easy_setopt(curl, CURLOPT_URL, "http://example.com/");

         /* call this function to set options for the socket */
         curl_easy_setopt(curl, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
         curl_easy_setopt(curl, CURLOPT_SOCKOPTDATA, &recvbuffersize);

         res = curl_easy_perform(curl);

         curl_easy_cleanup(curl);
       }

AVAILABILITY

       Added in 7.16.0

RETURN VALUE

       Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.

SEE ALSO

       CURLOPT_SOCKOPTFUNCTION(3), CURLOPT_OPENSOCKETFUNCTION(3),