[#BIO_info_cb-08]
= BIO_info_cb
:mrdocs:

Ctrl‐style info callback type used with BIO_callback_ctrl() / BIO_set_info_callback().

== Synopsis

Declared in `<openssl/bio.h>`

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

== Return Value

Command‐specific result (usually 1 on success).

== Parameters

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


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