[#SSL_SESSION_get0_alpn_selected]
= SSL_SESSION_get0_alpn_selected
:mrdocs:

Retrieve the ALPN protocol selected for a session and its length.

== Synopsis

Declared in `<openssl/ssl.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
SSL_SESSION_get0_alpn_selected(
    xref:SSL_SESSION.adoc[SSL_SESSION] const* s,
    unsigned char const** alpn,
    size_t* len);
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *s*
| Session to query.
| *alpn*
| On return, set to a pointer to the protocol bytes inside `s` (do not free).
| *len*
| On return, set to the length of the protocol in bytes.
|===


[.small]#Created with https://www.mrdocs.com[MrDocs]#