[#SSL_CTX_set_async_callback]
= SSL_CTX_set_async_callback
:mrdocs:

Set the asynchronous completion callback inherited by SSL objects from a context.

== Synopsis

Declared in `<openssl/ssl.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
SSL_CTX_set_async_callback(
    xref:SSL_CTX.adoc[SSL_CTX]* ctx,
    xref:SSL_async_callback_fn.adoc[SSL_async_callback_fn] callback);
----

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| SSL context whose default async callback is installed.
| *callback*
| Function invoked when an async‐capable engine finishes a crypto operation (with SSL_MODE_ASYNC).
|===


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