[#ERR_lib_error_string]
= ERR_lib_error_string
:mrdocs:

Return the human‐readable library name for a packed error code.

== Synopsis

Declared in `<openssl/err.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
char const*
ERR_lib_error_string(unsigned long e);
----

== Return Value

Internal library name string (do not free), or NULL if unknown.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *e*
| Error code as returned by ERR_get_error() (library field is used).
|===


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