[#OSSL_INOUT_CALLBACK]
= OSSL&lowbar;INOUT&lowbar;CALLBACK
:mrdocs:

Callback that both consumes input parameters and may populate output parameters&period;

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
typedef int OSSL&lowbar;INOUT&lowbar;CALLBACK(xref:OSSL_PARAM.adoc[OSSL&lowbar;PARAM] const[], xref:OSSL_PARAM.adoc[OSSL&lowbar;PARAM][], void*);
----

== Return Value

1 on success, or 0 on failure&period;

== Parameters

[cols="1,4"]
|===
| Name| Description
| *in&lowbar;params*
| Input parameter array from the caller&period;
| *out&lowbar;params*
| Optional output parameter array to fill, or NULL&period;
| *arg*
| Caller&hyphen;supplied opaque pointer&period;
|===


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