unix_events.py 文件源码

def __init__(self, loop, pipe, protocol, waiter=None, extra=None):
        super().__init__(extra, loop)
        self._extra['pipe'] = pipe
        self._pipe = pipe
        self._fileno = pipe.fileno()
        mode = os.fstat(self._fileno).st_mode
        is_socket = stat.S_ISSOCK(mode)
        if not (is_socket or
                stat.S_ISFIFO(mode) or
                stat.S_ISCHR(mode)):
            raise ValueError("Pipe transport is only for "
                             "pipes, sockets and character devices")
        _set_nonblocking(self._fileno)
        self._protocol = protocol
        self._buffer = []
        self._conn_lost = 0
        self._closing = False  # Set when close() or write_eof() called.

        self._loop.call_soon(self._protocol.connection_made, self)

        # On AIX, the reader trick (to be notified when the read end of the
        # socket is closed) only works for sockets. On other platforms it
        # works for pipes and sockets. (Exception: OS X 10.4?  Issue #19294.)
        if is_socket or not sys.platform.startswith("aix"):
            # only start reading when connection_made() has been called
            self._loop.call_soon(self._loop.add_reader,
                                 self._fileno, self._read_ready)

        if waiter is not None:
            # only wake up the waiter when connection_made() has been called
            self._loop.call_soon(waiter._set_result_unless_cancelled, None)