CURLOPT_PRIVATE(3) Library Functions Manual CURLOPT_PRIVATE(3)

CURLOPT_PRIVATE - store a private pointer

#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PRIVATE, void *pointer);

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.

NULL

All

struct private {
  void *custom;
};
int main(void)
{
  CURL *curl = curl_easy_init();
  struct private secrets;
  if(curl) {
    struct private *extracted;
    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
    /* store a pointer to our private struct */
    curl_easy_setopt(curl, CURLOPT_PRIVATE, &secrets);
    curl_easy_perform(curl);
    /* we can extract the private pointer again too */
    curl_easy_getinfo(curl, CURLINFO_PRIVATE, &extracted);
  }
}

Added in 7.10.3

Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.

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

2024-05-22 libcurl