[#BIO_get_data]
= BIO&lowbar;get&lowbar;data
:mrdocs:

Return the implementation&hyphen;specific pointer stored on a BIO&period;

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void*
BIO&lowbar;get&lowbar;data(xref:BIO.adoc[BIO]* a);
----

== Return Value

Opaque pointer previously set with BIO&lowbar;set&lowbar;data(), or NULL&period;

== Parameters

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


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