---
name: "CURLINFO_SSL_ENGINES"
section: "3"
platform: "macos"
package: "curl"
version: "166.0.0.0.1"
release: "macOS 26.5"
platforms: ["linux", "macos"]
url: "https://new.carta.tech/CURLINFO_SSL_ENGINES"
---

# CURLINFO\_SSL\_ENGINES(3)

get an slist of OpenSSL crypto-engines

## NAME

CURLINFO\_SSL\_ENGINES - get an slist of OpenSSL crypto-engines

## SYNOPSIS

```
#include <curl/curl.h>
CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_SSL_ENGINES,
                           struct curl_slist **engine_list);
```

## DESCRIPTION

Pass the address of a 'struct curl\_slist \*' to receive a linked-list of OpenSSL crypto-engines supported. Note that engines are normally implemented in separate dynamic libraries. Hence not all the returned engines may be available at runtime. **NOTE:** you must call *[curl\_slist\_free\_all(3)](/curl_slist_free_all/3.md)* on the list pointer once you are done with it, as libcurl does not free this data for you.

## PROTOCOLS

All TLS based ones.

## EXAMPLE

```
int main(void)
{
  CURL *curl = curl_easy_init();
  if(curl) {
    CURLcode res;
    struct curl_slist *engines;
    res = curl_easy_getinfo(curl, CURLINFO_SSL_ENGINES, &engines);
    if((res == CURLE_OK) && engines) {
      /* we have a list, free it when done using it */
      curl_slist_free_all(engines);
    }
    curl_easy_cleanup(curl);
  }
}
```

## AVAILABILITY

Added in 7.12.3. Available in OpenSSL builds with "engine" support.

## RETURN VALUE

Returns CURLE\_OK if the option is supported, and CURLE\_UNKNOWN\_OPTION if not.

## SEE ALSO

[**CURLOPT\_SSLENGINE**(3)](/CURLOPT_SSLENGINE/3.md), [**curl\_easy\_getinfo**(3)](/curl_easy_getinfo/3.md), [**curl\_easy\_setopt**(3)](/curl_easy_setopt/3.md)