[#SSL_get_fd]
= SSL_get_fd
:mrdocs:

Return the file descriptor linked to an SSL object's read BIO (or the shared fd).

== Synopsis

Declared in `<openssl/ssl.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
SSL_get_fd(xref:SSL.adoc[SSL] const* s);
----

== Return Value

File descriptor >= 0, or ‐1 if the underlying BIO is not fd‐based.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *s*
| SSL connection to query.
|===


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