[#SSL_CTX_sess_set_get_cb]
= SSL_CTX_sess_set_get_cb
:mrdocs:

Set the external session‐lookup callback used when a session id is not in the internal cache.

== Synopsis

Declared in `<openssl/ssl.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
SSL_CTX_sess_set_get_cb(
    xref:SSL_CTX.adoc[SSL_CTX]* ctx,
    xref:SSL_SESSION.adoc[SSL_SESSION]*(* get_session_cb)(xref:ssl_st.adoc[ssl_st]*, unsigned char const*, int, int*));
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| SSL context whose get‐session callback is set.
| *get_session_cb*
| Callback receiving the SSL, session‐id bytes, length, and an out `copy` flag; NULL disables it.
|===


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