[#OSSL_DECODER_CTX_add_extra]
= OSSL&lowbar;DECODER&lowbar;CTX&lowbar;add&lowbar;extra
:mrdocs:

Add decoder implementations that feed already&hyphen;attached decoders (build chains)&period;

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
OSSL&lowbar;DECODER&lowbar;CTX&lowbar;add&lowbar;extra(
    xref:OSSL_DECODER_CTX.adoc[OSSL&lowbar;DECODER&lowbar;CTX]* ctx,
    xref:OSSL_LIB_CTX.adoc[OSSL&lowbar;LIB&lowbar;CTX]* libctx,
    char const* propq);
----

== Return Value

1 on success, or 0 on failure&period;

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Decoder context to extend&period;
| *libctx*
| Library context used when fetching extra decoders, or NULL for the default&period;
| *propq*
| Optional property query for fetching, or NULL&period;
|===


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