e694c8284a
Expand a little. - mention the type name of the return code - avoid stating which exact return codes that might be returned, as that varies over time, builds and conditions - avoid stating some always return OK - refer to the manpage documenting all the return codes Closes #15900
73 lines
1.5 KiB
Markdown
73 lines
1.5 KiB
Markdown
---
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c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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SPDX-License-Identifier: curl
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Title: CURLINFO_XFER_ID
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Section: 3
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Source: libcurl
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See-also:
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- CURLINFO_CONN_ID (3)
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- curl_easy_getinfo (3)
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- curl_easy_setopt (3)
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Protocol:
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- All
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Added-in: 8.2.0
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---
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# NAME
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CURLINFO_XFER_ID - get the ID of a transfer
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# SYNOPSIS
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~~~c
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#include <curl/curl.h>
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CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_XFER_ID,
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curl_off_t *xfer_id);
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~~~
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# DESCRIPTION
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Pass a pointer to a *curl_off_t* to receive the identifier of the
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current/last transfer done with the handle. Stores -1 if no transfer
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has been started yet for the handle.
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The transfer id is unique among all transfers performed using the same
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connection cache. This is implicitly the case for all transfers in the
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same multi handle.
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# %PROTOCOLS%
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# EXAMPLE
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~~~c
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int main(void)
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{
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CURL *curl = curl_easy_init();
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if(curl) {
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CURLcode res;
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curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
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/* Perform the request */
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res = curl_easy_perform(curl);
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if(!res) {
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curl_off_t xfer_id;
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res = curl_easy_getinfo(curl, CURLINFO_XFER_ID, &xfer_id);
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if(!res) {
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printf("Transfer ID: %" CURL_FORMAT_CURL_OFF_T "\n", xfer_id);
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}
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}
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}
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}
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~~~
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# %AVAILABILITY%
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# RETURN VALUE
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curl_easy_getinfo(3) returns a CURLcode indicating success or error.
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CURLE_OK (0) means everything was OK, non-zero means an error occurred, see
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libcurl-errors(3).
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