ValueError: 文件描述符不能为负整数 (-1)

Question

文件“/home/pond/.local/lib/python3.8/site-packages/can/interfaces/socketcan/socketcan.py”，第 778 行，发送 ready = select.select([], [self.socket], [], time_left)[1] ValueError: 文件描述符不能为负整数 (-1)

这是发生的错误。我应该如何修改代码？谁能帮帮我。

在 Library socketcan 中显示如下：

def send(self, msg: Message, timeout: Optional[float] = None) -> None:
        """Transmit a message to the CAN bus.

        :param msg: A message object.
        :param timeout:
            Wait up to this many seconds for the transmit queue to be ready.
            If not given, the call may fail immediately.

        :raises ~can.exceptions.CanError:
            if the message could not be written.
        """
        log.debug("We've been asked to write a message to the bus")
        logger_tx = log.getChild("tx")
        logger_tx.debug("sending: %s", msg)

        started = time.time()
        # If no timeout is given, poll for availability
        if timeout is None:
            timeout = 0
        time_left = timeout
        data = build_can_frame(msg)

        while time_left >= 0 :
            # Wait for write availability
            ready = select.select([], [self.socket], [], time_left)[1]
            if not ready:
                # Timeout
                break
            channel = str(msg.channel) if msg.channel else None
            sent = self._send_once(data, channel)
            if sent == len(data):
                return
            # Not all data were sent, try again with remaining data
            data = data[sent:]
            time_left = timeout - (time.time() - started)

    def _send_once(self, data: bytes, channel: Optional[str] = None) -> int:
        try:
            if self.channel == "" and channel:
                # Message must be addressed to a specific channel
                sent = self.socket.sendto(data, (channel,))
            else:
                sent = self.socket.send(data)
        except OSError as error:
            raise can.CanOperationError(
                f"Failed to transmit: {error.strerror}", error.errno
            )
        return sent

我正在尝试通过 canbus 运行一个命令来控制转向角，并通过 GNSS 模块进行连接，但出现上述错误。