[#ERR_lib_error_string]
= ERR&lowbar;lib&lowbar;error&lowbar;string
:mrdocs:

Return the human&hyphen;readable library name 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;lib&lowbar;error&lowbar;string(unsigned long e);
----

== Return Value

Internal library name string (do not free), or NULL if unknown&period;

== Parameters

[cols="1,4"]
|===
| Name| Description
| *e*
| Error code as returned by ERR&lowbar;get&lowbar;error() (library field is used)&period;
|===


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