[#ENGINE_set_ex_data]
= ENGINE_set_ex_data
:mrdocs:

Store application data on an ENGINE at an ex_data index.

== Synopsis

Declared in `<openssl/engine.h>`

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

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

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *e*
| ENGINE whose CRYPTO_EX_DATA is updated.
| *idx*
| Index previously obtained from ENGINE_get_ex_new_index().
| *arg*
| Pointer to store at `idx.`
|===


[.small]#Created with https://www.mrdocs.com[MrDocs]#