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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)
- {
- TRY(Core::System::pledge("stdio settime"));
- 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 = lround(*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));
- }
- TRY(Core::System::pledge("stdio"));
- 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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