## NAME

CURLOPT_IOCTLDATA - custom pointer passed to I/O callback

## SYNOPSIS

#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_IOCTLDATA, void *pointer);

## DESCRIPTION

Pass the pointer that will be untouched by libcurl and passed as the 3rd argument in the ioctl callback set with CURLOPT_IOCTLFUNCTION.

## DEFAULT

By default, the value of this parameter is NULL.

## PROTOCOLS

Used with HTTP

## EXAMPLE

TODO

## AVAILABILITY

Added in 7.12.3

## RETURN VALUE

Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.

## SEE ALSO

CURLOPT_IOCTLFUNCTION CURLOPT_SEEKFUNCTION

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