[#ENGINE_CTRL_FUNC_PTR]
= ENGINE_CTRL_FUNC_PTR
:mrdocs:

ENGINE control‐command handler (same calling convention as ENGINE_ctrl()).

== Synopsis

Declared in `<openssl/engine.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
typedef int(* ENGINE_CTRL_FUNC_PTR)(xref:ENGINE.adoc[ENGINE]*, int, long, void*, void(*)());
----

== Return Value

Positive on success, or non‐positive on failure (command‐dependent).

== Parameters

[cols="1,4"]
|===
| Name| Description
| *e*
| ENGINE receiving the command.
| *cmd*
| Control command number.
| *i*
| Integer argument for the command.
| *p*
| Pointer argument for the command.
| *f*
| Optional function‐pointer argument for the command.
|===


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