[#SSL_CTX_set_next_proto_select_cb]
= SSL_CTX_set_next_proto_select_cb
:mrdocs:

Set the Next Protocol Negotiation (NPN) selection callback for clients.

== Synopsis

Declared in `<openssl/ssl.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
SSL_CTX_set_next_proto_select_cb(
    xref:SSL_CTX.adoc[SSL_CTX]* s,
    xref:SSL_CTX_npn_select_cb_func.adoc[SSL_CTX_npn_select_cb_func] cb,
    void* arg);
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *s*
| SSL context used by NPN clients.
| *cb*
| Callback that chooses a protocol from the server list.
| *arg*
| Opaque pointer passed to `cb.`
|===


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