[#OSSL_LIB_CTX_set0_default]
= OSSL_LIB_CTX_set0_default
:mrdocs:

Set the thread‐local default OSSL_LIB_CTX used when NULL is passed for libctx.

== Synopsis

Declared in `<openssl/crypto.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:OSSL_LIB_CTX.adoc[OSSL_LIB_CTX]*
OSSL_LIB_CTX_set0_default(xref:OSSL_LIB_CTX.adoc[OSSL_LIB_CTX]* libctx);
----

== Return Value

The previous default library context.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *libctx*
| Library context to install as the default, or NULL to restore the global default.
|===


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