[#ENGINE_ctrl_cmd_string]
= ENGINE_ctrl_cmd_string
:mrdocs:

Run a named ENGINE control command whose argument is a string (deprecated).

== Synopsis

Declared in `<openssl/engine.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
int
ENGINE_ctrl_cmd_string(
    xref:ENGINE.adoc[ENGINE]* e,
    char const* cmd_name,
    char const* arg,
    int cmd_optional);
----

[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 that receives the command.
| *cmd_name*
| Command name as advertised by the ENGINE.
| *arg*
| String argument for the command, or NULL.
| *cmd_optional*
| Non‐zero to treat an unknown command as success.
|===


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