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---
c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
SPDX-License-Identifier: curl
Title: CURLSHOPT_USERDATA
Section: 3
Source: libcurl
See-also:
- CURLSHOPT_LOCKFUNC (3)
- curl_share_cleanup (3)
- curl_share_init (3)
- curl_share_setopt (3)
---
# NAME
CURLSHOPT_USERDATA - pointer passed to the lock and unlock mutex callbacks
# SYNOPSIS
~~~c
#include <curl/curl.h>
CURLSHcode curl_share_setopt(CURLSH *share, CURLSHOPT_USERDATA, void *clientp);
~~~
# DESCRIPTION
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).
# PROTOCOLS
All
# EXAMPLE
~~~c
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));
}
~~~
# AVAILABILITY
Added in 7.10
# RETURN VALUE
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.
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