---
c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
SPDX-License-Identifier: curl
Title: CURLOPT_CHUNK_END_FUNCTION
Section: 3
Source: libcurl
See-also:
  - CURLOPT_CHUNK_BGN_FUNCTION (3)
  - CURLOPT_WILDCARDMATCH (3)
Protocol:
  - FTP
---

# NAME

CURLOPT_CHUNK_END_FUNCTION - callback after a transfer with FTP wildcard match

# SYNOPSIS

~~~c
#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

# EXAMPLE

~~~c
#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.