C++ (Cpp) generic_chars_in_buffer示例

示例#1

static int serial_chars_in_buffer (struct tty_struct *tty) 
{
	struct usb_serial_port *port = (struct usb_serial_port *) tty->driver_data;
	struct usb_serial *serial = get_usb_serial (port, __FUNCTION__);
	int retval = -EINVAL;

	if (!serial)
		return -ENODEV;

	down (&port->sem);

	dbg("%s = port %d", __FUNCTION__, port->number);

	if (!port->open_count) {
		dbg("%s - port not open", __FUNCTION__);
		goto exit;
	}

	/* pass on to the driver specific version of this function if it is available */
	if (serial->type->chars_in_buffer)
		retval = serial->type->chars_in_buffer(port);
	else
		retval = generic_chars_in_buffer(port);

exit:
	up (&port->sem);
	return retval;
}

示例#2

文件： usbserial.c 项目： nhanh0/hah

static int serial_chars_in_buffer (struct tty_struct *tty) 
{
	struct usb_serial_port *port = (struct usb_serial_port *) tty->driver_data;
	struct usb_serial *serial = get_usb_serial (port, __FUNCTION__);

	if (!serial) {
		return -ENODEV;
	}

	if (!port->active) {
		dbg (__FUNCTION__ " - port not open");
		return -EINVAL;
	}

	/* pass on to the driver specific version of this function if it is available */
	if (serial->type->chars_in_buffer) {
		return (serial->type->chars_in_buffer(port));
	} else {
		return (generic_chars_in_buffer(port));
	}
}