[#BIO_meth_get_callback_ctrl]
= BIO&lowbar;meth&lowbar;get&lowbar;callback&lowbar;ctrl
:mrdocs:

Return the callback&hyphen;ctrl function installed on a BIO&lowbar;METHOD&period;

== Synopsis

Declared in `&lt;openssl&sol;bio&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
long(*
BIO&lowbar;meth&lowbar;get&lowbar;callback&lowbar;ctrl(xref:BIO_METHOD.adoc[BIO&lowbar;METHOD] const* biom))(xref:BIO.adoc[BIO]*, int, xref:BIO_info_cb-08.adoc[BIO&lowbar;info&lowbar;cb]*);
----

== Return Value

Callback&hyphen;ctrl function, or NULL if unset&period;

== Parameters

[cols="1,4"]
|===
| Name| Description
| *biom*
| Method to query&period;
|===


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