CURLSHOPT_USERDATA - Man Page

#include <curl/curl.h>

CURLSHcode curl_share_setopt(CURLSH *share, CURLSHOPT_USERDATA, void *clientp);

The clientp parameter is held verbatim by libcurl and is passed on as the clientp argument to the callbacks set with CURLSHOPT_LOCKFUNC(3) and CURLSHOPT_UNLOCKFUNC(3).

This functionality affects all supported protocols

struct secrets {
  void *custom;
};

int main(void)
{
  CURLSHcode sh;
  struct secrets private_stuff;
  CURLSH *share = curl_share_init();
  sh = curl_share_setopt(share, CURLSHOPT_USERDATA, &private_stuff);
  if(sh)
    printf("Error: %s\n", curl_share_strerror(sh));
}

Added in curl 7.10.3

CURLSHE_OK (zero) means that the option was set properly, non-zero means an error occurred. See libcurl-errors(3) for the full list with descriptions.

CURLSHOPT_LOCKFUNC(3), curl_share_cleanup(3), curl_share_init(3), curl_share_setopt(3)

curl_share_setopt(3), CURLSHOPT_LOCKFUNC(3), CURLSHOPT_UNLOCKFUNC(3), libcurl-symbols(3).