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, "https://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),