[#ERR_FATAL_ERROR]
= ERR&lowbar;FATAL&lowbar;ERROR
:mrdocs:

Return whether a packed error code is marked fatal&period;

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
&lsqb;&lsqb;maybe&lowbar;unused&rsqb;&rsqb;
static
int
ERR&lowbar;FATAL&lowbar;ERROR(unsigned long errcode);
----

[NOTE]
====
This entity https://en.cppreference.com/cpp/language/attributes/maybe_unused[may be unused^], and the compiler will not warn about it.
====
== Return Value

Non&hyphen;zero if ERR&lowbar;RFLAG&lowbar;FATAL is set on `errcode,` otherwise 0&period;

== Parameters

[cols="1,4"]
|===
| Name| Description
| *errcode*
| Error code as returned by ERR&lowbar;get&lowbar;error() or ERR&lowbar;peek&lowbar;error()&period;
|===


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