---
name: "CURLOPT_CHUNK_END_FUNCTION"
section: "3"
platform: "macos"
package: "curl"
version: "166.0.0.0.1"
release: "macOS 26.5"
platforms: ["linux", "macos"]
url: "https://new.carta.tech/CURLOPT_CHUNK_END_FUNCTION"
---

# CURLOPT\_CHUNK\_END\_FUNCTION(3)

callback after a transfer with FTP wildcard match

## NAME

CURLOPT\_CHUNK\_END\_FUNCTION - callback after a transfer with FTP wildcard match

## SYNOPSIS

```
#include <curl/curl.h>
long chunk_end_callback(void *ptr);
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CHUNK_END_FUNCTION,
                          chunk_end_callback);
```

## DESCRIPTION

Pass a pointer to your callback function, which should match the prototype shown above.

This function gets called by libcurl as soon as a part of the stream has been transferred (or skipped).

Return *CURL\_CHUNK\_END\_FUNC\_OK* if everything is fine or **CURL\_CHUNK\_END\_FUNC\_FAIL** to tell the lib to stop if some error occurred.

## DEFAULT

NULL

## PROTOCOLS

FTP

## EXAMPLE

```
#include <stdio.h>
struct callback_data {
   FILE *output;
};
static long file_is_downloaded(struct callback_data *data)
{
  if(data->output) {
    fclose(data->output);
    data->output = 0x0;
  }
  return CURL_CHUNK_END_FUNC_OK;
}
int main()
{
  /* data for callback */
  struct callback_data callback_info;
  CURL *curl = curl_easy_init();
  curl_easy_setopt(curl, CURLOPT_CHUNK_END_FUNCTION, file_is_downloaded);
  curl_easy_setopt(curl, CURLOPT_CHUNK_DATA, &callback_info);
}
```

## AVAILABILITY

Added in 7.21.0

## RETURN VALUE

Returns CURLE\_OK if the option is supported, and CURLE\_UNKNOWN\_OPTION if not.

## SEE ALSO

[**CURLOPT\_CHUNK\_BGN\_FUNCTION**(3)](/CURLOPT_CHUNK_BGN_FUNCTION/3.md), [**CURLOPT\_WILDCARDMATCH**(3)](/CURLOPT_WILDCARDMATCH/3.md)