[#BIO_info_cb-08]
= BIO&lowbar;info&lowbar;cb
:mrdocs:

Ctrl&hyphen;style info callback type used with BIO&lowbar;callback&lowbar;ctrl() &sol; BIO&lowbar;set&lowbar;info&lowbar;callback()&period;

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
typedef int BIO&lowbar;info&lowbar;cb(xref:BIO.adoc[BIO]*, int, int);
----

== Return Value

Command&hyphen;specific result (usually 1 on success)&period;

== Parameters

[cols="1,4"]
|===
| Name| Description
| *b*
| BIO being controlled&period;
| *cmd*
| BIO control command&period;
| *arg*
| Integer argument for the control operation&period;
|===


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