[#ERR_add_error_data]
= ERR&lowbar;add&lowbar;error&lowbar;data
:mrdocs:

Append concatenated C strings as auxiliary data to the most recent error&period;

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
ERR&lowbar;add&lowbar;error&lowbar;data(int num, &period;&period;&period;);
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *num*
| Number of following NUL&hyphen;terminated `char` &ast; arguments to concatenate (total length per error capped at 4096 bytes)&period;
|===


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