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CURLOPT_DEBUGDATA explained

Name

CURLOPT_DEBUGDATA - pointer passed to the debug callback

Synopsis

 #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 in the last void * argument. This pointer is not used by libcurl, it is only passed to the callback.

Default

NULL

Protocols

This functionality affects all supported protocols

Example

 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

Added in curl 7.9.6

Return value

curl_easy_setopt returns a CURLcode indicating success or error.

CURLE_OK (0) means everything was OK, non-zero means an error occurred, see libcurl-errors.