[#BIO_up_ref]
= BIO_up_ref
:mrdocs:

Increment the reference count of a BIO.

== Synopsis

Declared in `<openssl/bio.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
BIO_up_ref(xref:BIO.adoc[BIO]* a);
----

== Return Value

1 on success, or 0 if reference counting is unavailable.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *a*
| BIO to reference.
|===


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