DOKK / manpages / debian 12 / libcurl4-doc / CURLOPT_DEBUGDATA.3.en
CURLOPT_DEBUGDATA(3) curl_easy_setopt options CURLOPT_DEBUGDATA(3)

CURLOPT_DEBUGDATA - pointer passed to the debug callback

#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DEBUGDATA, void *pointer);

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.

NULL

All

int main(void)
{

CURL *curl;
CURLcode res;
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/");
res = curl_easy_perform(curl);
/* always cleanup */
curl_easy_cleanup(curl);
}
return 0; }

Always

Returns CURLE_OK

CURLOPT_STDERR(3), CURLOPT_DEBUGFUNCTION(3),

January 2, 2023 libcurl 7.88.1