Method getPPSEventTimestamp

phc/pps_source.go:297–313

getPPSEventTimestamp reads the first PPS event from the sink file descriptor and returns the timestamp of the event

()

}

// getPPSEventTimestamp reads the first PPS event from the sink file descriptor and returns the timestamp of the event
func (ppsSink *PPSSink) getPPSEventTimestamp() (time.Time, error) {
	var event PtpExttsEvent
	buf := make([]byte, binary.Size(event))
	_, err := ppsSink.Device.Read(buf)
	if err != nil {
		return time.Time{}, fmt.Errorf("error reading from sink %v: %w", ppsSink.Device.File().Name(), err)
	}
	event = *(*PtpExttsEvent)(unsafe.Pointer(&buf[0])) // urgh...
	if uint(event.Index) != ppsSink.InputPin {
		return time.Time{}, fmt.Errorf("extts on unexpected pin index %d, expected %d", event.Index, ppsSink.InputPin)
	}

	t := event.T
	eventTime := time.Unix(t.Sec, int64(t.Nsec))

	return eventTime, nil
}

// pollFd polls the file descriptor for an event, and returns the number of events, the file descriptor, and error