[#SSL_callback_ctrl]
= SSL_callback_ctrl
:mrdocs:

Perform a low‐level control operation that takes a function‐pointer argument on an SSL connection.

== Synopsis

Declared in `<openssl/ssl.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
long
SSL_callback_ctrl(
    xref:SSL.adoc[SSL]* ssl,
    int cmd,
    void(* fp)());
----

== Return Value

Command‐specific long result; prefer typed helpers over calling this directly.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ssl*
| SSL connection to manipulate.
| *cmd*
| Control command that expects a callback (see SSL_CTRL_* helpers).
| *fp*
| Callback pointer whose type and meaning depend on `cmd.`
|===


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