[#ERR_func_error_string]
= ERR&lowbar;func&lowbar;error&lowbar;string
:mrdocs:

Return the function name for a packed error code (deprecated&semi; always returns NULL in 3&period;0)&period;

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
&lsqb;&lsqb;deprecated&rsqb;&rsqb;
char const*
ERR&lowbar;func&lowbar;error&lowbar;string(unsigned long e);
----

[WARNING]
====
https://en.cppreference.com/cpp/language/attributes/deprecated[Deprecated^]. Use of this entity is allowed but discouraged.
====
== Return Value

Always NULL in OpenSSL 3&period;0 and later&period;

== Parameters

[cols="1,4"]
|===
| Name| Description
| *e*
| Packed error code (function field is ignored)&period;
|===


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