CURLINFO_LASTSOCKET(3)

NAME
CURLINFO_LASTSOCKET - last socket used

SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_LASTSOCKET, long *socket);

DESCRIPTION
Deprecated since 7.45.0. Use CURLINFO_ACTIVESOCKET(3) instead. Pass a pointer to a long to receive the last socket used by this curl session. If the socket is no longer valid, -1 is returned. When you finish working with the socket, you must call curl_easy_cleanup(3) as usual and let libcurl close the socket and cleanup other resources associated with the handle. This is typically used in combination with CURLOPT_CONNECT_ONLY(3). NOTE: this API is deprecated since it is not working on win64 where the SOCKET type is 64 bits large while its 'long' is 32 bits. Use the CURLINFO_ACTIVESOCKET(3) instead, if possible.

PROTOCOLS
This functionality affects all supported protocols

EXAMPLE
int main(void)
{
  CURL *curl = curl_easy_init();
  if(curl) {
    CURLcode result;
    long sockfd; /* does not work on win64 */
    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
    /* Do not do the transfer - only connect to host */
    curl_easy_setopt(curl, CURLOPT_CONNECT_ONLY, 1L);
    result = curl_easy_perform(curl);
    if(result != CURLE_OK) {
      printf("Error: %s\n", curl_easy_strerror(result));
      curl_easy_cleanup(curl);
      return 1;
    }
    /* Extract the socket from the curl handle */
    result = curl_easy_getinfo(curl, CURLINFO_LASTSOCKET, &sockfd);
    if(!result && sockfd != -1) {
      /* operate on sockfd */
    }
    curl_easy_cleanup(curl);
  }
}

AVAILABILITY
Added in curl 7.15.2

RETURN VALUE
curl_easy_getinfo(3) returns a CURLcode indicating success or error. CURLE_OK (0) means everything was OK, non-zero means an error occurred, see libcurl-errors(3).

SEE ALSO
CURLINFO_ACTIVESOCKET(3), CURLOPT_CONNECT_ONLY(3), curl_easy_getinfo(3), curl_easy_setopt(3)