[#OSSL_SELF_TEST_set_callback]
= OSSL_SELF_TEST_set_callback
:mrdocs:

Register a callback invoked during provider self‐test operations.

== Synopsis

Declared in `<openssl/self_test.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
OSSL_SELF_TEST_set_callback(
    xref:OSSL_LIB_CTX.adoc[OSSL_LIB_CTX]* libctx,
    xref:OSSL_CALLBACK.adoc[OSSL_CALLBACK]* cb,
    void* cbarg);
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *libctx*
| Library context, or NULL for the default.
| *cb*
| Self‐test event callback, or NULL to clear.
| *cbarg*
| Opaque argument passed to `cb.`
|===


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