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 {
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
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 2026-07-12 CURLOPT_PRIVATE(3)
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