CURLINFO_LASTSOCKET(3)     Library Functions Manual     CURLINFO_LASTSOCKET(3)

NAME
       CURLINFO_LASTSOCKET - get the 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 If the socket is no longer valid, -1 is returned.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
       All

EXAMPLE
       int main(void)
       {
         CURL *curl = curl_easy_init();
         if(curl) {
           CURLcode res;
           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);
           res = curl_easy_perform(curl);

           /* Extract the socket from the curl handle */
           res = curl_easy_getinfo(curl, CURLINFO_LASTSOCKET, &sockfd);

           if(res != CURLE_OK) {
             printf("Error: %s\n", curl_easy_strerror(res));
             return 1;
           }
         }
       }

AVAILABILITY
       Added in 7.15.2

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

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

libcurl                          April 26 2024          CURLINFO_LASTSOCKET(3)