[#SSL_client_hello_get0_session_id]
= SSL_client_hello_get0_session_id
:mrdocs:

Return the session_id field from the ClientHello being processed.

== Synopsis

Declared in `<openssl/ssl.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
size_t
SSL_client_hello_get0_session_id(
    xref:SSL.adoc[SSL]* s,
    unsigned char const** out);
----

== Return Value

Length of the session id in bytes, or 0 if unavailable.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *s*
| SSL object during a client‐hello callback.
| *out*
| Receives a pointer to the session id octets; do not free.
|===


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