CURLINFO_PRIVATE(3) - Man pages

CURLINFO_PRIVATE(3)         Library Functions Manual        CURLINFO_PRIVATE(3)

NAME
       CURLINFO_PRIVATE - get the private pointer

SYNOPSIS
       #include <curl/curl.h>

       CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_PRIVATE, char **private);

DESCRIPTION
       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 *'.

PROTOCOLS
       This functionality affects all supported protocols

EXAMPLE
       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);
         }
       }

AVAILABILITY
       Added in curl 7.10.3

RETURN VALUE
       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).

SEE ALSO
       CURLOPT_PRIVATE(3), curl_easy_getinfo(3), curl_easy_setopt(3)

libcurl                            2026-07-12               CURLINFO_PRIVATE(3)

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