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/*
* Copyright (c) 2020, Nico Weber <thakis@chromium.org>
* Copyright (c) 2022, Matthias Zimmerman <matthias291999@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibCore/ArgsParser.h>
#include <LibCore/System.h>
#include <math.h>
#include <sys/time.h>
#include <unistd.h>
ErrorOr<int> serenity_main(Main::Arguments arguments)
{
#ifdef __serenity__
TRY(Core::System::pledge("stdio settime"));
#endif
Core::ArgsParser args_parser;
Optional<double> delta;
args_parser.add_option(delta, "Adjust system time by this many seconds", "set", 's', "delta_seconds");
args_parser.parse(arguments);
if (delta.has_value()) {
long delta_us = static_cast<long>(round(*delta * 1'000'000));
timeval delta_timeval;
delta_timeval.tv_sec = delta_us / 1'000'000;
delta_timeval.tv_usec = delta_us % 1'000'000;
if (delta_timeval.tv_usec < 0) {
delta_timeval.tv_sec--;
delta_timeval.tv_usec += 1'000'000;
}
TRY(Core::System::adjtime(&delta_timeval, nullptr));
}
#ifdef __serenity__
TRY(Core::System::pledge("stdio"));
#endif
timeval remaining_delta_timeval;
TRY(Core::System::adjtime(nullptr, &remaining_delta_timeval));
double remaining_delta = remaining_delta_timeval.tv_sec + remaining_delta_timeval.tv_usec / 1'000'000.0;
outln("{}", remaining_delta);
return 0;
}
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