// clang-format off
//===------------------------- chrono.cpp ---------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#include "third_party/libcxx/chrono"
#include "third_party/libcxx/cerrno"        // errn"
#include "libc/sysv/consts/clock.h"
#include "libc/time/time.h"
#include "libc/sysv/consts/clock.h"
#include "third_party/libcxx/system_error"  // __throw_system_erro"

#define _LIBCPP_USE_CLOCK_GETTIME

_LIBCPP_BEGIN_NAMESPACE_STD

namespace chrono
{

// system_clock

const bool system_clock::is_steady;

system_clock::time_point
system_clock::now() _NOEXCEPT
{
  struct timespec tp;
  if (0 != clock_gettime(CLOCK_REALTIME, &tp))
    __throw_system_error(errno, "clock_gettime(CLOCK_REALTIME) failed");
  return time_point(seconds(tp.tv_sec) + microseconds(tp.tv_nsec / 1000));
}

time_t
system_clock::to_time_t(const time_point& t) _NOEXCEPT
{
    return time_t(duration_cast<seconds>(t.time_since_epoch()).count());
}

system_clock::time_point
system_clock::from_time_t(time_t t) _NOEXCEPT
{
    return system_clock::time_point(seconds(t));
}

// steady_clock
//
// Warning:  If this is not truly steady, then it is non-conforming.  It is
//  better for it to not exist and have the rest of libc++ use system_clock
//  instead.

const bool steady_clock::is_steady;

steady_clock::time_point
steady_clock::now() _NOEXCEPT
{
    struct timespec tp;
    if (0 != clock_gettime(CLOCK_MONOTONIC, &tp))
        __throw_system_error(errno, "clock_gettime(CLOCK_MONOTONIC) failed");
    return time_point(seconds(tp.tv_sec) + nanoseconds(tp.tv_nsec));
}

}  // namespace chrono

_LIBCPP_END_NAMESPACE_STD