HHD_SERIAL_PURGE_TXABORT | 0x00000001 | Terminates all outstanding overlapped write operations and returns immediately, even if the write operations have not been completed. |
HHD_SERIAL_PURGE_RXABORT | 0x00000002 | Terminates all outstanding overlapped read operations and returns immediately, even if the read operations have not been completed. |
HHD_SERIAL_PURGE_TXCLEAR | 0x00000004 | Clears the output buffer (if the device driver has one). |
HHD_SERIAL_PURGE_RXCLEAR | 0x00000008 | Clears the input buffer (if the device driver has one). |