B.3.4.2  The u Structure (Not Supported)

For UNIX, open and close procedures may set the u.u_error member of the u structure to return errors to the stream head. For Windows NT, a process does not have a u structure. Instead, the function StrmSetError (Section B.3.5) is provided to perform the equivalent of an assignment to u.u_error. No other u structure members are emulated.