[#ASYNC_callback_fn]
= ASYNC&lowbar;callback&lowbar;fn
:mrdocs:

Callback invoked when an asynchronous wait context is ready&period;

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
typedef int(* ASYNC&lowbar;callback&lowbar;fn)(void*);
----

== Return Value

Application&hyphen;defined status code&period;

== Parameters

[cols="1,4"]
|===
| Name| Description
| *arg*
| User data supplied when the callback was registered&period;
|===


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