NAME¶

CURLOPT_SOCKOPTDATA - 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 is untouched by libcurl and passed as the first argument in the sockopt callback set with CURLOPT_SOCKOPTFUNCTION(3).

DEFAULT¶

NULL

PROTOCOLS¶

This functionality affects all supported protocols

EXAMPLE¶

static int sockopt_callback(void *clientp, curl_socket_t curlfd,


                            curlsocktype purpose)
{


  int val = *(int *)clientp;


  setsockopt((int)curlfd, SOL_SOCKET, SO_RCVBUF,


             (const char *)&val, sizeof(val));


  return CURL_SOCKOPT_OK;
}
int main(void)
{


  CURL *curl = curl_easy_init();


  if(curl) {


    CURLcode res;


    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 curl 7.16.0

RETURN VALUE¶

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

SEE ALSO¶

CURLOPT_OPENSOCKETFUNCTION(3), CURLOPT_SOCKOPTFUNCTION(3)