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---
c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
SPDX-License-Identifier: curl
Title: CURLOPT_DEBUGDATA
Section: 3
Source: libcurl
See-also:
- CURLOPT_DEBUGFUNCTION (3)
- CURLOPT_STDERR (3)
Protocol:
- All
Added-in: 7.9.6
---
# NAME
CURLOPT_DEBUGDATA - pointer passed to the debug callback
# SYNOPSIS
~~~c
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DEBUGDATA, void *pointer);
~~~
# DESCRIPTION
Pass a *pointer* to whatever you want passed in to your
CURLOPT_DEBUGFUNCTION(3) in the last void * argument. This pointer is
not used by libcurl, it is only passed to the callback.
# DEFAULT
NULL
# %PROTOCOLS%
# EXAMPLE
~~~c
struct data {
void *custom;
};
static int my_trace(CURL *handle, curl_infotype type,
char *data, size_t size,
void *clientp)
{
struct data *mine = clientp;
printf("our ptr: %p\n", mine->custom);
/* output debug info */
return 0;
}
int main(void)
{
CURL *curl;
CURLcode result;
struct data my_tracedata;
curl = curl_easy_init();
if(curl) {
curl_easy_setopt(curl, CURLOPT_DEBUGFUNCTION, my_trace);
curl_easy_setopt(curl, CURLOPT_DEBUGDATA, &my_tracedata);
/* the DEBUGFUNCTION has no effect until we enable VERBOSE */
curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
result = curl_easy_perform(curl);
/* always cleanup */
curl_easy_cleanup(curl);
}
return 0;
}
~~~
# %AVAILABILITY%
# RETURN VALUE
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).
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