mirror of
https://github.com/Chuyu-Team/VC-LTL5.git
synced 2026-10-18 22:00:51 +08:00
mingkuang
91 lines
2.5 KiB
C++
91 lines
2.5 KiB
C++
//
|
|
// time.cpp
|
|
//
|
|
// Copyright (c) Microsoft Corporation. All rights reserved.
|
|
//
|
|
// The timespec_get() and time() families of functions, which get the current
|
|
// system time as a timespec and a time_t, respectively.
|
|
//
|
|
#include <corecrt_internal_time.h>
|
|
|
|
|
|
|
|
template <typename TimeSpecType>
|
|
_Success_(return != 0)
|
|
static int __cdecl common_timespec_get(TimeSpecType* const ts, int const base) throw()
|
|
{
|
|
typedef decltype(ts->tv_sec) time_type;
|
|
typedef __crt_time_time_t_traits<time_type> time_traits;
|
|
|
|
_VALIDATE_RETURN(ts != nullptr, EINVAL, 0);
|
|
|
|
if (base != TIME_UTC)
|
|
return 0;
|
|
|
|
__crt_filetime_union system_time{};
|
|
__acrt_GetSystemTimePreciseAsFileTime(&system_time._filetime);
|
|
|
|
__time64_t const filetime_scale{10 * 1000 * 1000}; // 100ns units
|
|
|
|
__time64_t const epoch_time{static_cast<__time64_t>(system_time._scalar) - _EPOCH_BIAS};
|
|
|
|
__time64_t const seconds {epoch_time / filetime_scale};
|
|
__time64_t const nanoseconds{epoch_time % filetime_scale * 100};
|
|
|
|
if (seconds > static_cast<__time64_t>(time_traits::max_time_t))
|
|
return 0;
|
|
|
|
ts->tv_sec = static_cast<time_type>(seconds);
|
|
ts->tv_nsec = static_cast<long>(nanoseconds);
|
|
return base;
|
|
}
|
|
|
|
#if WindowsTargetPlatformMinVersion < WindowsTargetPlatformWindows10_10240
|
|
extern "C" int __cdecl _timespec32_get(_timespec32* const ts, int const base)
|
|
{
|
|
return common_timespec_get(ts, base);
|
|
}
|
|
|
|
_LCRT_DEFINE_IAT_SYMBOL(_timespec32_get);
|
|
#endif
|
|
|
|
#if WindowsTargetPlatformMinVersion < WindowsTargetPlatformWindows10_10240
|
|
extern "C" int __cdecl _timespec64_get(_timespec64* const ts, int const base)
|
|
{
|
|
return common_timespec_get(ts, base);
|
|
}
|
|
|
|
_LCRT_DEFINE_IAT_SYMBOL(_timespec64_get);
|
|
#endif
|
|
|
|
|
|
// Gets the current system time and converts it to a time_t value. If 'result'
|
|
// is non-null, the time is stored in '*result'. The time is also returned
|
|
// (even if 'result' is null).
|
|
template <typename TimeType>
|
|
static TimeType __cdecl common_time(TimeType* const result) throw()
|
|
{
|
|
typedef __crt_time_time_t_traits<TimeType> time_traits;
|
|
|
|
typename time_traits::timespec_type ts{};
|
|
if (common_timespec_get(&ts, TIME_UTC) != TIME_UTC)
|
|
ts.tv_sec = static_cast<TimeType>(-1);
|
|
|
|
if (result)
|
|
*result = ts.tv_sec;
|
|
|
|
return ts.tv_sec;
|
|
}
|
|
|
|
#if 0
|
|
extern "C" __time32_t __cdecl _time32(__time32_t* const result)
|
|
{
|
|
return common_time(result);
|
|
}
|
|
|
|
extern "C" __time64_t __cdecl _time64(__time64_t* const result)
|
|
{
|
|
return common_time(result);
|
|
}
|
|
#endif
|