[#BIO_free]
= BIO_free
:mrdocs:

Free a single BIO (does not free BIOs linked after it in a chain).

== Synopsis

Declared in `<openssl/bio.h>`

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

== Description

To free an entire chain, use BIO_free_all() / BIO_vfree().

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *a*
| BIO to free; NULL is ignored.
|===


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