[#SSL_CTX_set_ex_data]
= SSL_CTX_set_ex_data
:mrdocs:

Store application‐specific data on an SSL_CTX at a previously allocated index.

== Synopsis

Declared in `<openssl/ssl.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
SSL_CTX_set_ex_data(
    xref:SSL_CTX.adoc[SSL_CTX]* ssl,
    int idx,
    void* data);
----

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ssl*
| SSL context that owns the ex_data table.
| *idx*
| Index from SSL_CTX_get_ex_new_index() (or CRYPTO_get_ex_new_index).
| *data*
| Pointer to store; ownership remains with the caller unless freef was configured.
|===


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