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CURLOPT_DEBUGDATA(3) Library Functions Manual CURLOPT_DEBUGDATA(3) 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_DEBUGFUNC- TION(3) 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(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). SEE ALSO CURLOPT_DEBUGFUNCTION(3), CURLOPT_STDERR(3) libcurl 2026-06-11 CURLOPT_DEBUGDATA(3)
NAME | SYNOPSIS | DESCRIPTION | DEFAULT | PROTOCOLS | EXAMPLE | AVAILABILITY | RETURN VALUE | SEE ALSO
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