[#ERR_add_error_data]
= ERR_add_error_data
:mrdocs:

Append concatenated C strings as auxiliary data to the most recent error.

== Synopsis

Declared in `<openssl/err.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
ERR_add_error_data(int num, ...);
----

== Parameters

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


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