[#SSL_CTX_has_client_custom_ext]
= SSL&lowbar;CTX&lowbar;has&lowbar;client&lowbar;custom&lowbar;ext
:mrdocs:

Return whether a client custom extension of type `ext&lowbar;type` is registered on `ctx&period;`

== Synopsis

Declared in `&lt;openssl&sol;ssl&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
SSL&lowbar;CTX&lowbar;has&lowbar;client&lowbar;custom&lowbar;ext(
    xref:SSL_CTX.adoc[SSL&lowbar;CTX] const* ctx,
    unsigned int ext&lowbar;type);
----

== Return Value

1 if a client custom extension handler is registered, or 0 otherwise&period;

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| SSL context to query&period;
| *ext&lowbar;type*
| TLS extension type code&period;
|===


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