[#BIO_set_ex_data]
= BIO_set_ex_data
:mrdocs:

Store application‐specific data on a BIO at the given ex_data index.

== Synopsis

Declared in `<openssl/bio.h>`

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

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *bio*
| BIO that owns the ex_data table.
| *idx*
| Index obtained from BIO_get_ex_new_index() (or 0 for app data).
| *data*
| Pointer to store; ownership and lifetime are caller‐defined.
|===


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