a desired consumer label for the selected GPIO line(s) such as "my-listener"
desired flags for the desired GPIO event line, such as GPIOEVENT_REQUEST_RISING_EDGE or GPIOEVENT_REQUEST_FALLING_EDGE
if successful this field will contain a valid anonymous file handle after a GPIO_GET_LINEEVENT_IOCTL operation, zero or negative value means error
desired handle flags for the desired GPIO line, such as GPIOHANDLE_REQUEST_ACTIVE_LOW or GPIOHANDLE_REQUEST_OPEN_DRAIN
the desired line to subscribe to events from, specified by offset index for the associated GPIO device
Information about a GPIO event request