[#ASYNC_WAIT_CTX_get_callback]
= ASYNC_WAIT_CTX_get_callback
:mrdocs:

Retrieve the completion callback previously set on an async wait context.

== Synopsis

Declared in `<openssl/async.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
ASYNC_WAIT_CTX_get_callback(
    xref:ASYNC_WAIT_CTX.adoc[ASYNC_WAIT_CTX]* ctx,
    xref:ASYNC_callback_fn.adoc[ASYNC_callback_fn]* callback,
    void** callback_arg);
----

== Return Value

1 if a callback is set, or 0 if none was registered.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Wait context to query.
| *callback*
| Receives the registered callback function pointer.
| *callback_arg*
| Receives the callback user argument.
|===


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