[#ERR_func_error_string]
= ERR_func_error_string
:mrdocs:

Return the function name for a packed error code (deprecated; always returns NULL in 3.0).

== Synopsis

Declared in `<openssl/err.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
char const*
ERR_func_error_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 3.0 and later.

== Parameters

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


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