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