[#ERR_reason_error_string]
= ERR&lowbar;reason&lowbar;error&lowbar;string
:mrdocs:

Return the registered reason&hyphen;string for a packed error code&period;

== Synopsis

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

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

== Return Value

Reason description string (do not free), or NULL if none is registered&period;

== Parameters

[cols="1,4"]
|===
| Name| Description
| *e*
| Packed error code whose reason field is looked up&period;
|===


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