Atmosphere/libraries/libstratosphere/source/lm/srv/lm_time_util.cpp

79 lines
2.5 KiB
C++

/*
* Copyright (c) Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stratosphere.hpp>
#include "lm_time_util.hpp"
namespace ams::lm::srv {
namespace {
constinit std::atomic_bool g_is_time_invalid = false;
constinit time::PosixTime InvalidPosixTime = { .value = 0 };
constexpr bool IsValidPosixTime(time::PosixTime time) {
return time.value > 0;
}
void EnsureTimeInitialized() {
static constinit os::SdkMutex g_time_initialized_mutex;
static constinit bool g_time_initialized = false;
if (AMS_UNLIKELY(!g_time_initialized)) {
std::scoped_lock lk(g_time_initialized_mutex);
if (AMS_LIKELY(!g_time_initialized)) {
R_ABORT_UNLESS(time::Initialize());
g_time_initialized = true;
}
}
}
}
time::PosixTime GetCurrentTime() {
/* Ensure that we can use time services. */
EnsureTimeInitialized();
/* Repeatedly try to get a valid time. */
for (auto wait_seconds = 1; wait_seconds <= 8; wait_seconds *= 2) {
/* Get the standard user system clock time. */
time::PosixTime current_time{};
if (R_FAILED(time::StandardUserSystemClock::GetCurrentTime(std::addressof(current_time)))) {
return InvalidPosixTime;
}
/* If the time is valid, return it. */
if (IsValidPosixTime(current_time)) {
return current_time;
}
/* Check if we've failed to get a time in the past. */
if (g_is_time_invalid) {
return InvalidPosixTime;
}
/* Wait a bit before trying again. */
os::SleepThread(TimeSpan::FromSeconds(wait_seconds));
}
/* We failed to get a valid time. */
g_is_time_invalid = true;
return InvalidPosixTime;
}
}