Int 21 Fn 4406  - DOS 2+ - Ioctl - Get Input Status                        [D]

   AX = 4406h
   BX = file handle

Return: CF clear if successful
       AL = input status
       00h not ready (device) or at EOF (file)
       FFh ready
   CF set on error
       AX = error code (01h,05h,06h,0Dh) (see AH=59h)

Note:  files may not register as being at EOF if positioned there by AH=42h

See Also: AX=4407h,INT 2F/AX=122Bh