Function OffsetBetweenDevices

phc/offset.go:207–226

OffsetBetweenDevices returns estimated difference between two PHC devices

(deviceA, deviceB *os.File)

// OffsetBetweenDevices returns estimated difference between two PHC devices
func OffsetBetweenDevices(deviceA, deviceB *os.File) (time.Duration, error) {
	adev, bdev := FromFile(deviceA), FromFile(deviceB)
	preciseA, err := adev.ReadSysoffPrecise()
	if err == nil {
		preciseB, err := bdev.ReadSysoffPrecise()
		if err != nil {
			return 0, err
		}
		return preciseB.Sub(preciseA), nil
	}
	extendedA, err := adev.ReadSysoffExtended()
	if err != nil {
		return 0, err
	}
	extendedB, err := bdev.ReadSysoffExtended()
	if err != nil {
		return 0, err
	}
	return extendedB.Sub(extendedA)
}