u64bit get_nanoseconds_clock()
{
#if defined(BOTAN_TARGET_OS_HAS_CLOCK_GETTIME)
struct ::timespec tv;
::clock_gettime(CLOCK_REALTIME, &tv);
return combine_timers(tv.tv_sec, tv.tv_nsec, 1000000000);
#elif defined(BOTAN_TARGET_OS_HAS_GETTIMEOFDAY)
struct ::timeval tv;
::gettimeofday(&tv, 0);
return combine_timers(tv.tv_sec, tv.tv_usec, 1000000);
#elif defined(BOTAN_TARGET_OS_HAS_WIN32_GET_SYSTEMTIME)
// Returns time since January 1, 1601 in 100-ns increments
::FILETIME tv;
::GetSystemTimeAsFileTime(&tv);
u64bit tstamp = (static_cast<u64bit>(tv.dwHighDateTime) << 32) |
tv.dwLowDateTime;
return (tstamp * 100); // Scale to 1 nanosecond units
#else
return combine_timers(static_cast<u32bit>(std::time(0)),
std::clock(), CLOCKS_PER_SEC);
#endif
}
/*************************************************
* Get the timestamp *
*************************************************/
u64bit Unix_Timer::clock() const
{
struct timeval tv;
gettimeofday(&tv, 0);
return combine_timers(tv.tv_sec, tv.tv_usec, 1000000);
}
