Dmitry,

The dialect is 3. The SQL declaration is:

DECLARE EXTERNAL FUNCTION RETORNAMONTHYEAR
TIMESTAMP
RETURNS CSTRING(10) CHARACTER SET NONE FREE_IT
ENTRY_POINT 'fn_RetornaMonthYear' MODULE_NAME 'mcudflib';

It returns a 8 bytes string, including \0 ("01/2009"). The malloc
alocs 8 bytes. I tried 1000 bytes with no difference in the error message.

The same code in a Windows DLL works fine.

Thanks,
Marco Castro