CURLOPT_SOCKOPTDATA(3)

CURLOPT_SOCKOPTDATA(3curl_easy_setopt optionCURLOPT_SOCKOPTDATA(3)

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.

libcurl 7.58.0      Last change: May 15, 2017                   1

CURLOPT_SOCKOPTDATA(3curl_easy_setopt optionCURLOPT_SOCKOPTDATA(3)

SEE ALSO

     CURLOPT_SOCKOPTFUNCTION(3), CURLOPT_OPENSOCKETFUNCTION(3),

libcurl 7.58.0      Last change: May 15, 2017                   2