[#BIO_get_callback_ex]
= BIO_get_callback_ex
:mrdocs:

Return the extended BIO callback installed with BIO_set_callback_ex().

== Synopsis

Declared in `<openssl/bio.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:BIO_callback_fn_ex.adoc[BIO_callback_fn_ex]
BIO_get_callback_ex(xref:BIO.adoc[BIO] const* b);
----

== Return Value

Extended callback, or NULL if unset.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *b*
| BIO to query.
|===


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