CURLOPT_PRIVATE(3)         Library Functions Manual         CURLOPT_PRIVATE(3)

NAME
       CURLOPT_PRIVATE - store a private pointer

SYNOPSIS
       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PRIVATE, void *pointer);

DESCRIPTION
       Pass a void * as parameter, pointing to data that should be associated
       with this curl handle. The pointer can subsequently be retrieved using
       curl_easy_getinfo(3) with the CURLINFO_PRIVATE(3) option. libcurl
       itself never does anything with this data.

DEFAULT
       NULL

PROTOCOLS
       This functionality affects all supported protocols

EXAMPLE
       struct private_data {
         void *custom;
       };

       int main(void)
       {
         CURL *curl = curl_easy_init();
         struct private_data secrets;
         if(curl) {
           CURLcode result;
           struct private_data *extracted;
           curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");

           /* store a pointer to our private_data struct */
           curl_easy_setopt(curl, CURLOPT_PRIVATE, &secrets);

           result = curl_easy_perform(curl);

           /* we can extract the private_data pointer again too */
           curl_easy_getinfo(curl, CURLINFO_PRIVATE, &extracted);

           curl_easy_cleanup(curl);
         }
       }

AVAILABILITY
       Added in curl 7.10.3

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
       CURLINFO_PRIVATE(3), CURLOPT_STDERR(3), CURLOPT_VERBOSE(3)

libcurl                           2026-09-02                CURLOPT_PRIVATE(3)