To get the function trace string that was specified in the SET SESSION FUNCTION TRACE statement, call FNC_Trace_String in the UDF. You can use the value of the trace string to determine what to output to the trace table.
The following statements call FNC_Trace_String, which passes back the trace string in the trace_string argument:
SQL_TEXT trace_string[257]; FNC_Trace_String(trace_string);