[#BIO_meth_set_callback_ctrl]
= BIO_meth_set_callback_ctrl
:mrdocs:

Install the callback‐ctrl function on a custom BIO_METHOD.

== Synopsis

Declared in `<openssl/bio.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
BIO_meth_set_callback_ctrl(
    xref:BIO_METHOD.adoc[BIO_METHOD]* biom,
    long(* callback_ctrl)(xref:BIO.adoc[BIO]*, int, xref:BIO_info_cb-08.adoc[BIO_info_cb]*));
----

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *biom*
| Method object to update.
| *callback_ctrl*
| Function invoked for BIO_callback_ctrl()‐style commands.
|===


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