=head1 DESCRIPTION
The error code returned by ERR_get_error() consists of a library
-number, function code and reason code. ERR_GET_LIB()
+number and reason code. ERR_GET_LIB()
and ERR_GET_REASON() can be used to extract these.
ERR_FATAL_ERROR() indicates whether a given error code is a fatal error.
-The library number and function code describe where the error
+The library number describes where the error
occurred, the reason code is the information about what went wrong.
-Each sub-library of OpenSSL has a unique library number; function and
-reason codes are unique within each sub-library. Note that different
-libraries may use the same value to signal different functions and
-reasons.
+Each sub-library of OpenSSL has a unique library number; the
+reason code is unique within each sub-library. Note that different
+libraries may use the same value to signal different reasons.
B<ERR_R_...> reason codes such as B<ERR_R_MALLOC_FAILURE> are globally
unique. However, when checking for sub-library specific reason codes,
=head1 RETURN VALUES
-The library number, function code, reason code, and whether the error
+The library number, reason code, and whether the error
is fatal, respectively.
Starting with OpenSSL 3.0.0, the function code is always set to zero.