CURLINFO_XFER_ID(3)        Library Functions Manual        CURLINFO_XFER_ID(3)

NAME
       CURLINFO_XFER_ID - get the ID of a transfer

SYNOPSIS
       #include <curl/curl.h>

       CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_XFER_ID,
                                  curl_off_t *xfer_id);

DESCRIPTION
       Pass a pointer to a curl_off_t to receive the identifier of the
       current/last transfer done with the handle. Stores -1 if no transfer
       has been started yet for the handle.

       The transfer id is unique among all transfers performed using the same
       connection cache. This is implicitly the case for all transfers in the
       same multi handle.

PROTOCOLS
       All

EXAMPLE
       int main(void)
       {
         CURL *curl = curl_easy_init();
         if(curl) {
           CURLcode res;
           curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");

           /* Perform the request */
           res = curl_easy_perform(curl);

           if(!res) {
             curl_off_t xfer_id;
             res = curl_easy_getinfo(curl, CURLINFO_XFER_ID, &xfer_id);
             if(!res) {
               printf("Transfer ID: %" CURL_FORMAT_CURL_OFF_T "\n", xfer_id);
             }
           }
         }
       }

AVAILABILITY
       Added in 8.2.0

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

SEE ALSO
       CURLINFO_CONN_ID(3), curl_easy_getinfo(3), curl_easy_setopt(3)

libcurl                          April 26 2024             CURLINFO_XFER_ID(3)