[#SSL_get_handshake_rtt]
= SSL_get_handshake_rtt
:mrdocs:

Return the measured TLS handshake round‐trip time in microseconds when available.

== Synopsis

Declared in `<openssl/ssl.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
SSL_get_handshake_rtt(
    xref:SSL.adoc[SSL] const* s,
    uint64_t* rtt);
----

== Return Value

1 if an RTT measurement is available, or 0 / a negative value otherwise.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *s*
| SSL connection to query.
| *rtt*
| Receives the RTT in microseconds.
|===


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