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CURLINFO_XFER_ID(3) Library Functions Manual CURLINFO_XFER_ID(3) NAME CURLINFO_XFER_ID - ID of the 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 cur- rent/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 con- nection cache. This is implicitly the case for all transfers in the same multi handle. PROTOCOLS This functionality affects all supported protocols EXAMPLE int main(void) { CURL *curl = curl_easy_init(); if(curl) { CURLcode result; curl_easy_setopt(curl, CURLOPT_URL, "https://example.com"); /* Perform the request */ result = curl_easy_perform(curl); if(result == CURLE_OK) { curl_off_t xfer_id; result = curl_easy_getinfo(curl, CURLINFO_XFER_ID, &xfer_id); if(result == CURLE_OK) { printf("Transfer ID: %" CURL_FORMAT_CURL_OFF_T "\n", xfer_id); } } } } AVAILABILITY Added in curl 8.2.0 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_CONN_ID(3), curl_easy_getinfo(3), curl_easy_setopt(3) libcurl 2026-06-11 CURLINFO_XFER_ID(3)
NAME | SYNOPSIS | DESCRIPTION | PROTOCOLS | EXAMPLE | AVAILABILITY | RETURN VALUE | SEE ALSO
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