CURLINFO_PRIVATE - get the private pointer

Added in curl 7.10.3

Pass a pointer to a char pointer to receive the pointer to the private data associated with the curl handle (set with the CURLOPT_PRIVATE(3)). Please note that for internal reasons, the value is returned as a char pointer, although effectively being a 'void *'.

int main(void) { CURL *curl = curl_easy_init(); if(curl) { CURLcode res; void *pointer = (void *)0x2345454; curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/foo.bin"); /* set the private pointer */ curl_easy_setopt(curl, CURLOPT_PRIVATE, pointer); res = curl_easy_perform(curl); /* extract the private pointer again */ res = curl_easy_getinfo(curl, CURLINFO_PRIVATE, &pointer); if(res) printf("error: %s\n", curl_easy_strerror(res)); curl_easy_cleanup(curl); } }

CURLINFO_PRIVATE - get the private pointer

This functionality affects all supported protocols

curl_easy_getinfo(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).

CURLOPT_PRIVATE(3), curl_easy_getinfo(3), curl_easy_setopt(3) libcurl 2025-06-16 CURLINFO_PRIVATE(3)

#include <curl/curl.h> CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_PRIVATE, char **private);