[#SSL_CTX_set_not_resumable_session_callback]
= SSL_CTX_set_not_resumable_session_callback
:mrdocs:

Register a context‐wide callback that decides whether new sessions may be resumed.

== Synopsis

Declared in `<openssl/ssl.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
SSL_CTX_set_not_resumable_session_callback(
    xref:SSL_CTX.adoc[SSL_CTX]* ctx,
    int(* cb)(xref:SSL.adoc[SSL]*, int));
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| SSL context whose sessions inherit this policy (copied to new SSL objects by SSL_new).
| *cb*
| Callback returning non‐zero to mark the session non‐resumable; `is_forward_secure` indicates forward secrecy.
|===


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