[#BIO_ADDRINFO_protocol]
= BIO_ADDRINFO_protocol
:mrdocs:

Return the protocol number from an address‐info element (for example IPPROTO_TCP).

== Synopsis

Declared in `<openssl/bio.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
BIO_ADDRINFO_protocol(xref:BIO_ADDRINFO.adoc[BIO_ADDRINFO] const* bai);
----

== Return Value

Protocol constant suitable for socket(), or 0 if unspecified.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *bai*
| Address‐info node from BIO_lookup_ex() / BIO_ADDRINFO_next().
|===


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