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 13Added-in: 8.2.0 14--- 15 16# NAME 17 18CURLINFO_XFER_ID - get the ID of a transfer 19 20# SYNOPSIS 21 22~~~c 23#include <curl/curl.h> 24 25CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_XFER_ID, 26 curl_off_t *xfer_id); 27~~~ 28 29# DESCRIPTION 30 31Pass a pointer to a *curl_off_t* to receive the identifier of the 32current/last transfer done with the handle. Stores -1 if no transfer 33has been started yet for the handle. 34 35The transfer id is unique among all transfers performed using the same 36connection cache. This is implicitly the case for all transfers in the 37same multi handle. 38 39# %PROTOCOLS% 40 41# EXAMPLE 42 43~~~c 44int main(void) 45{ 46 CURL *curl = curl_easy_init(); 47 if(curl) { 48 CURLcode res; 49 curl_easy_setopt(curl, CURLOPT_URL, "https://example.com"); 50 51 /* Perform the request */ 52 res = curl_easy_perform(curl); 53 54 if(!res) { 55 curl_off_t xfer_id; 56 res = curl_easy_getinfo(curl, CURLINFO_XFER_ID, &xfer_id); 57 if(!res) { 58 printf("Transfer ID: %" CURL_FORMAT_CURL_OFF_T "\n", xfer_id); 59 } 60 } 61 } 62} 63~~~ 64 65# %AVAILABILITY% 66 67# RETURN VALUE 68 69Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not. 70
