[#ENGINE_ctrl]
= ENGINE_ctrl
:mrdocs:

Dispatch a control command to an ENGINE (deprecated).

== Synopsis

Declared in `<openssl/engine.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
int
ENGINE_ctrl(
    xref:ENGINE.adoc[ENGINE]* e,
    int cmd,
    long i,
    void* p,
    void(* f)());
----

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

Command‐specific positive value on success, or non‐positive on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *e*
| ENGINE receiving the command.
| *cmd*
| Control command (ENGINE_CTRL_* or ENGINE‐specific).
| *i*
| Integer argument for `cmd.`
| *p*
| Pointer argument for `cmd,` or NULL when unused.
| *f*
| Optional function‐pointer argument for `cmd,` or NULL.
|===


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