socket.py 文件源码

def connect(self, address):
        if isinstance(address, tuple) and len(address) == 2:
            address = gethostbyname(address[0]), address[1]
        if self.timeout == 0.0:
            return self._sock.connect(address)
        sock = self._sock
        if self.timeout is None:
            while True:
                err = sock.getsockopt(SOL_SOCKET, SO_ERROR)
                if err:
                    raise error(err, strerror(err))
                result = sock.connect_ex(address)
                if not result or result == EISCONN:
                    break
                elif (result in (EWOULDBLOCK, EINPROGRESS, EALREADY)) or (result == EINVAL and is_windows):
                    wait_readwrite(sock.fileno(), event=self._rw_event)
                else:
                    raise error(result, strerror(result))
        else:
            end = time.time() + self.timeout
            while True:
                err = sock.getsockopt(SOL_SOCKET, SO_ERROR)
                if err:
                    raise error(err, strerror(err))
                result = sock.connect_ex(address)
                if not result or result == EISCONN:
                    break
                elif (result in (EWOULDBLOCK, EINPROGRESS, EALREADY)) or (result == EINVAL and is_windows):
                    timeleft = end - time.time()
                    if timeleft <= 0:
                        raise timeout('timed out')
                    wait_readwrite(sock.fileno(), timeout=timeleft, event=self._rw_event)
                else:
                    raise error(result, strerror(result))