[#BIO_meth_set_destroy]
= BIO_meth_set_destroy
:mrdocs:

Install the destroy callback invoked when a BIO of this method is freed.

== Synopsis

Declared in `<openssl/bio.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
BIO_meth_set_destroy(
    xref:BIO_METHOD.adoc[BIO_METHOD]* biom,
    int(* destroy)(xref:BIO.adoc[BIO]*));
----

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *biom*
| Method being configured.
| *destroy*
| Callback that releases method‐specific state for a BIO; may be NULL.
|===


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