---
name: "CURLOPT_CHUNK_END_FUNCTION"
section: "3"
platform: "linux"
package: "curl"
version: "8.23.0-1"
release: "Arch Linux 2026-11-01"
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

This functionality affects ftp only

## EXAMPLE

```
#include <stdio.h>
struct callback_data {
  FILE *output;
};
static long file_is_downloaded(void *ptr)
{
  struct callback_data *data = ptr;
  if(data->output) {
    fclose(data->output);
    data->output = 0x0;
  }
  return CURL_CHUNK_END_FUNC_OK;
}
int main(void)
{
  /* 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 curl 7.21.0

## RETURN VALUE

*[curl\_easy\_setopt(3)](/curl_easy_setopt/3.md)* returns a CURLcode indicating success or error.

CURLE\_OK (0) means everything was OK, non-zero means an error occurred, see *[libcurl-errors(3)](/libcurl-errors/3.md)*.

## SEE ALSO

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