// ===== CFDate =====
func convertTimeToCFDate(t time.Time) C.CFDateRef {
// truncate to milliseconds, to get a more predictable conversion
ms := int64(time.Duration(t.UnixNano()) / time.Millisecond * time.Millisecond)
nano := C.double(ms) / C.double(time.Second)
nano -= C.kCFAbsoluteTimeIntervalSince1970
return C.CFDateCreate(nil, C.CFAbsoluteTime(nano))
}
// EventIDForDeviceBeforeTime returns an event ID before a given time.
func EventIDForDeviceBeforeTime(dev int32, before time.Time) uint64 {
tm := C.CFAbsoluteTime(before.Unix())
return uint64(C.FSEventsGetLastEventIdForDeviceBeforeTime(C.dev_t(dev), tm))
}
// https://developer.apple.com/library/mac/documentation/Darwin/Reference/FSEvents_Ref/Reference/reference.html#jumpTo_5
func LastEventBefore(dev Device, ts time.Time) EventID {
return EventID(
C.FSEventsGetLastEventIdForDeviceBeforeTime(
C.dev_t(dev),
C.CFAbsoluteTime(ts.Unix())))
}