1---
2c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
3SPDX-License-Identifier: curl
4Title: CURLOPT_TRAILERDATA
5Section: 3
6Source: libcurl
7See-also:
8  - CURLOPT_TRAILERFUNCTION (3)
9  - CURLOPT_WRITEFUNCTION (3)
10---
11
12# NAME
13
14CURLOPT_TRAILERDATA - pointer passed to trailing headers callback
15
16# SYNOPSIS
17
18~~~c
19#include <curl.h>
20
21CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TRAILERDATA, void *userdata);
22~~~
23
24# DESCRIPTION
25
26Data pointer to be passed to the HTTP trailer callback function.
27
28# DEFAULT
29
30NULL
31
32# PROTOCOLS
33
34HTTP
35
36# EXAMPLE
37
38~~~c
39struct MyData {
40  void *custom;
41};
42
43int main(void)
44{
45  CURL *curl = curl_easy_init();
46  if(curl) {
47    struct MyData data;
48    curl_easy_setopt(curl, CURLOPT_TRAILERDATA, &data);
49  }
50}
51~~~
52
53# AVAILABILITY
54
55This option was added in curl 7.64.0 and is present if HTTP support is enabled
56
57# RETURN VALUE
58
59Returns CURLE_OK.
60