1--- 2c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al. 3SPDX-License-Identifier: curl 4Title: CURLINFO_XFER_ID 5Section: 3 6Source: libcurl 7See-also: 8 - CURLINFO_CONN_ID (3) 9 - curl_easy_getinfo (3) 10 - curl_easy_setopt (3) 11Protocol: 12 - All 13--- 14 15# NAME 16 17CURLINFO_XFER_ID - get the ID of a transfer 18 19# SYNOPSIS 20 21~~~c 22#include <curl/curl.h> 23 24CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_XFER_ID, 25 curl_off_t *xfer_id); 26~~~ 27 28# DESCRIPTION 29 30Pass a pointer to a *curl_off_t* to receive the identifier of the 31current/last transfer done with the handle. Stores -1 if no transfer 32has been started yet for the handle. 33 34The transfer id is unique among all transfers performed using the same 35connection cache. This is implicitly the case for all transfers in the 36same multi handle. 37 38# EXAMPLE 39 40~~~c 41int main(void) 42{ 43 CURL *curl = curl_easy_init(); 44 if(curl) { 45 CURLcode res; 46 curl_easy_setopt(curl, CURLOPT_URL, "https://example.com"); 47 48 /* Perform the request */ 49 res = curl_easy_perform(curl); 50 51 if(!res) { 52 curl_off_t xfer_id; 53 res = curl_easy_getinfo(curl, CURLINFO_XFER_ID, &xfer_id); 54 if(!res) { 55 printf("Transfer ID: %" CURL_FORMAT_CURL_OFF_T "\n", xfer_id); 56 } 57 } 58 } 59} 60~~~ 61 62# AVAILABILITY 63 64Added in 8.2.0 65 66# RETURN VALUE 67 68Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not. 69
