[#ENGINE_add]
= ENGINE_add
:mrdocs:

Add `e` to OpenSSL's internal list of loaded ENGINEs.

== Synopsis

Declared in `<openssl/engine.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
int
ENGINE_add(xref:ENGINE.adoc[ENGINE]* e);
----

[WARNING]
====
https://en.cppreference.com/cpp/language/attributes/deprecated[Deprecated^]. Use of this entity is allowed but discouraged.
====
== Description

On success OpenSSL holds its own structural reference internally.

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *e*
| Structural reference to the ENGINE to register; the caller retains ownership and must still ENGINE_free() it.
|===


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