[#SSL_CTX_npn_advertised_cb_func]
= SSL_CTX_npn_advertised_cb_func
:mrdocs:

NPN server callback that advertises the server's protocol list.

== Synopsis

Declared in `<openssl/ssl.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
typedef int(* SSL_CTX_npn_advertised_cb_func)(xref:SSL.adoc[SSL]*, unsigned char const**, unsigned int*, void*);
----

== Return Value

SSL_TLSEXT_ERR_OK to send the list, or another SSL_TLSEXT_ERR_* code.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ssl*
| Server SSL connection performing NPN.
| *out*
| Set to the wire‐format protocol list to advertise.
| *outlen*
| Receives the length of *`out.`
| *arg*
| User argument from SSL_CTX_set_next_protos_advertised_cb.
|===


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