.\" generated by cd2nroff 0.1 from CURLOPT_PRIVATE.md
.TH CURLOPT_PRIVATE 3 "2025-06-27" libcurl
.SH NAME
CURLOPT_PRIVATE \- store a private pointer
.SH SYNOPSIS
.nf
#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PRIVATE, void *pointer);
.fi
.SH DESCRIPTION
Pass a void * as parameter, pointing to data that should be associated with
this curl handle. The pointer can subsequently be retrieved using
\fIcurl_easy_getinfo(3)\fP with the \fICURLINFO_PRIVATE(3)\fP option. libcurl itself
never does anything with this data.
.SH DEFAULT
NULL
.SH PROTOCOLS
This functionality affects all supported protocols
.SH EXAMPLE
.nf
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);
  }
}
.fi
.SH AVAILABILITY
Added in curl 7.10.3
.SH RETURN VALUE
\fIcurl_easy_setopt(3)\fP returns a CURLcode indicating success or error.

CURLE_OK (0) means everything was OK, non\-zero means an error occurred, see
\fIlibcurl\-errors(3)\fP.
.SH SEE ALSO
.BR CURLINFO_PRIVATE (3),
.BR CURLOPT_STDERR (3),
.BR CURLOPT_VERBOSE (3)