CURLOPT\_CHUNK\_END\_FUNCTION(3) Library Functions Manual CURLOPT\_CHUNK\_END\_FUNCTION(3)

# [NAME](#NAME)

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

# [SYNOPSIS](#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](#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](#DEFAULT)

NULL

# [PROTOCOLS](#PROTOCOLS)

This functionality affects ftp only

# [EXAMPLE](#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](#AVAILABILITY)

Added in curl 7.21.0

# [RETURN VALUE](#RETURN_VALUE)

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

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

# [SEE ALSO](#SEE_ALSO)

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

2026-10-22 libcurl

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Document: CURLOPT_CHUNK_END_FUNCTION(3) from curl 8.23.0-r2 (Chainguard OS)
Source: https://github.com/curl/curl.git