[#BIO_set_data]
= BIO_set_data
:mrdocs:

Store an implementation‐specific pointer on a BIO (used by custom BIO methods).

== Synopsis

Declared in `<openssl/bio.h>`

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

== Parameters

[cols="1,4"]
|===
| Name| Description
| *a*
| BIO whose app‐data pointer is set.
| *ptr*
| Opaque pointer for the BIO method implementation.
|===


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