[#BIO_ptr_ctrl]
= BIO_ptr_ctrl
:mrdocs:

Invoke a BIO ctrl that returns a pointer result.

== Synopsis

Declared in `<openssl/bio.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void*
BIO_ptr_ctrl(
    xref:BIO.adoc[BIO]* bp,
    int cmd,
    long larg);
----

== Return Value

Pointer returned by the ctrl implementation, or NULL.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *bp*
| BIO to control.
| *cmd*
| Control command that yields a pointer (for example BIO_C_GET_BUF_MEM).
| *larg*
| Long argument passed through to BIO_ctrl().
|===


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