[#BIO_get_ex_data]
= BIO_get_ex_data
:mrdocs:

Retrieve application data previously stored on a BIO with BIO_set_ex_data().

== Synopsis

Declared in `<openssl/bio.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void*
BIO_get_ex_data(
    xref:BIO.adoc[BIO] const* bio,
    int idx);
----

== Return Value

Stored pointer, or NULL if unset.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *bio*
| BIO to query.
| *idx*
| Ex‐data index from BIO_get_ex_new_index() or a class‐specific allocator.
|===


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