How to use the ovs.winutils function in ovs

def __init__(self, socket, name, status, pipe=None, is_server=False):
        self.socket = socket
        self.pipe = pipe
        if sys.platform == 'win32':
            if pipe is not None:
                # Flag to check if fd is a server HANDLE.  In the case of a
                # server handle we have to issue a disconnect before closing
                # the actual handle.
                self._server = is_server
                suffix = name.split(":", 1)[1]
                suffix = ovs.util.abs_file_name(ovs.dirs.RUNDIR, suffix)
                self._pipename = winutils.get_pipe_name(suffix)
                self._read = pywintypes.OVERLAPPED()
                self._read.hEvent = winutils.get_new_event()
                self._write = pywintypes.OVERLAPPED()
                self._write.hEvent = winutils.get_new_event()
            else:
                self._wevent = winutils.get_new_event(bManualReset=False,
                                                      bInitialState=False)

        self.name = name
        if status == errno.EAGAIN:
            self.state = Stream.__S_CONNECTING
        elif status == 0:
            self.state = Stream.__S_CONNECTED
        else:
            self.state = Stream.__S_DISCONNECTED

bind_path = name[6:]
        if name.startswith("punix:"):
            bind_path = ovs.util.abs_file_name(ovs.dirs.RUNDIR, bind_path)
            if sys.platform != 'win32':
                error, sock = ovs.socket_util.make_unix_socket(
                    socket.SOCK_STREAM, True, bind_path, None)
                if error:
                    return error, None
            else:
                # Branch used only on Windows
                try:
                    open(bind_path, 'w').close()
                except:
                    return errno.ENOENT, None

                pipename = winutils.get_pipe_name(bind_path)
                if len(pipename) > 255:
                    # Return invalid argument if the name is too long
                    return errno.ENOENT, None

                npipe = winutils.create_named_pipe(pipename)
                if not npipe:
                    return errno.ENOENT, None
                return 0, PassiveStream(None, name, bind_path, pipe=npipe)

        elif name.startswith("ptcp:"):
            sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
            sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
            remote = name.split(':')
            sock.bind((remote[1], int(remote[2])))

        else:

try:
                winutils.get_overlapped_result(self.pipe, self.connect, False)
            except pywintypes.error as e:
                if e.winerror == winutils.winerror.ERROR_IO_INCOMPLETE:
                    # The operation is still pending, try again
                    self.connect_pending = True
                    return errno.EAGAIN, None
                else:
                    if self.pipe:
                        win32pipe.DisconnectNamedPipe(self.pipe)
                    return errno.EINVAL, None
            self.connect_pending = False

        error = winutils.connect_named_pipe(self.pipe, self.connect)
        if error:
            if error == winutils.winerror.ERROR_IO_PENDING:
                self.connect_pending = True
                return errno.EAGAIN, None
            elif error != winutils.winerror.ERROR_PIPE_CONNECTED:
                if self.pipe:
                    win32pipe.DisconnectNamedPipe(self.pipe)
                self.connect_pending = False
                return errno.EINVAL, None
            else:
                win32event.SetEvent(self.connect.hEvent)

        npipe = winutils.create_named_pipe(self._pipename)
        if not npipe:
            return errno.ENOENT, None

        old_pipe = self.pipe
        self.pipe = npipe

def __recv_windows(self, n):
        if self._read_pending:
            try:
                nBytesRead = winutils.get_overlapped_result(self.pipe,
                                                            self._read,
                                                            False)
                self._read_pending = False
            except pywintypes.error as e:
                if e.winerror == winutils.winerror.ERROR_IO_INCOMPLETE:
                    # The operation is still pending, try again
                    self._read_pending = True
                    return (errno.EAGAIN, "")
                elif e.winerror in winutils.pipe_disconnected_errors:
                    # If the pipe was disconnected, return 0.
                    return (0, "")
                else:
                    return (errno.EINVAL, "")
        else:
            (errCode, self._read_buffer) = winutils.read_file(self.pipe,
                                                              n,
                                                              self._read)
            if errCode:
                if errCode == winutils.winerror.ERROR_IO_PENDING:
                    self._read_pending = True
                    return (errno.EAGAIN, "")
                elif errCode in winutils.pipe_disconnected_errors:
                    # If the pipe was disconnected, return 0.
                    return (0, "")
                else:

def check_connection_completion(sock):
    if sys.platform == "win32":
        p = ovs.poller.SelectPoll()
        event = winutils.get_new_event(None, False, True, None)
        # Receive notification of readiness for writing, of completed
        # connection or multipoint join operation, and of socket closure.
        win32file.WSAEventSelect(sock, event,
                                 win32file.FD_WRITE |
                                 win32file.FD_CONNECT |
                                 win32file.FD_CLOSE)
        p.register(event, ovs.poller.POLLOUT)
    else:
        p = ovs.poller.get_system_poll()
        p.register(sock, ovs.poller.POLLOUT)
    pfds = p.poll(0)
    if len(pfds) == 1:
        revents = pfds[0][1]
        if revents & ovs.poller.POLLERR or revents & ovs.poller.POLLHUP:
            try:
                # The following should raise an exception.

self.connect_pending = False

        error = winutils.connect_named_pipe(self.pipe, self.connect)
        if error:
            if error == winutils.winerror.ERROR_IO_PENDING:
                self.connect_pending = True
                return errno.EAGAIN, None
            elif error != winutils.winerror.ERROR_PIPE_CONNECTED:
                if self.pipe:
                    win32pipe.DisconnectNamedPipe(self.pipe)
                self.connect_pending = False
                return errno.EINVAL, None
            else:
                win32event.SetEvent(self.connect.hEvent)

        npipe = winutils.create_named_pipe(self._pipename)
        if not npipe:
            return errno.ENOENT, None

        old_pipe = self.pipe
        self.pipe = npipe
        winutils.win32event.ResetEvent(self.connect.hEvent)
        return 0, Stream(None, self.name, 0, pipe=old_pipe)

def __scs_connecting(self):
        if self.socket is not None:
            retval = ovs.socket_util.check_connection_completion(self.socket)
            assert retval != errno.EINPROGRESS
        elif sys.platform == 'win32':
            if self.retry_connect:
                try:
                    self.pipe = winutils.create_file(self._pipename)
                    self._retry_connect = False
                    retval = 0
                except pywintypes.error as e:
                    if e.winerror == winutils.winerror.ERROR_PIPE_BUSY:
                        retval = errno.EAGAIN
                    else:
                        self._retry_connect = False
                        retval = errno.ENOENT
            else:
                # If retry_connect is false, it means it's already
                # connected so we can set the value of retval to 0
                retval = 0

        if retval == 0:
            self.state = Stream.__S_CONNECTED
        elif retval != errno.EAGAIN:

if len(suffix) > 255:
                    # Return invalid argument if the name is too long
                    return errno.ENOENT, None

                try:
                    # In case of "unix:" argument, the assumption is that
                    # there is a file created in the path (suffix).
                    open(suffix, 'r').close()
                except:
                    return errno.ENOENT, None

                try:
                    npipe = winutils.create_file(pipename)
                    try:
                        winutils.set_pipe_mode(npipe,
                                               win32pipe.PIPE_READMODE_BYTE)
                    except pywintypes.error:
                        return errno.ENOENT, None
                except pywintypes.error as e:
                    if e.winerror == winutils.winerror.ERROR_PIPE_BUSY:
                        # Pipe is busy, set the retry flag to true and retry
                        # again during the connect function.
                        Stream.retry_connect = True
                        return 0, cls(None, name, errno.EAGAIN,
                                      pipe=win32file.INVALID_HANDLE_VALUE,
                                      is_server=False)
                    return errno.ENOENT, None
                return 0, cls(None, name, 0, pipe=npipe, is_server=False)

        error, sock = cls._open(suffix, dscp)
        if error:

def __accept_windows(self):
        if self.connect_pending:
            try:
                winutils.get_overlapped_result(self.pipe, self.connect, False)
            except pywintypes.error as e:
                if e.winerror == winutils.winerror.ERROR_IO_INCOMPLETE:
                    # The operation is still pending, try again
                    self.connect_pending = True
                    return errno.EAGAIN, None
                else:
                    if self.pipe:
                        win32pipe.DisconnectNamedPipe(self.pipe)
                    return errno.EINVAL, None
            self.connect_pending = False

        error = winutils.connect_named_pipe(self.pipe, self.connect)
        if error:
            if error == winutils.winerror.ERROR_IO_PENDING:
                self.connect_pending = True
                return errno.EAGAIN, None

nBytesWritten = winutils.get_overlapped_result(self.pipe,
                                                               self._write,
                                                               False)
                self._write_pending = False
            except pywintypes.error as e:
                if e.winerror == winutils.winerror.ERROR_IO_INCOMPLETE:
                    # The operation is still pending, try again
                    self._read_pending = True
                    return -errno.EAGAIN
                elif e.winerror in winutils.pipe_disconnected_errors:
                    # If the pipe was disconnected, return connection reset.
                    return -errno.ECONNRESET
                else:
                    return -errno.EINVAL
        else:
            (errCode, nBytesWritten) = winutils.write_file(self.pipe,
                                                           buf,
                                                           self._write)
            if errCode:
                if errCode == winutils.winerror.ERROR_IO_PENDING:
                    self._write_pending = True
                    return -errno.EAGAIN
                if (not nBytesWritten and
                        errCode in winutils.pipe_disconnected_errors):
                    # If the pipe was disconnected, return connection reset.
                    return -errno.ECONNRESET
        return nBytesWritten