curl/docs/libcurl/opts/CURLOPT_PRIVATE.md

---

c: Copyright (C) Daniel Stenberg, daniel@haxx.se, et al. SPDX-License-Identifier: curl Title: CURLOPT_PRIVATE Section: 3 Source: libcurl See-also:

• CURLINFO_PRIVATE (3)
• CURLOPT_STDERR (3)
• CURLOPT_VERBOSE (3) Protocol:
• All Added-in: 7.10.3 ---

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%

EXAMPLE

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);
  }
}

%AVAILABILITY%

RETURN VALUE

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