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SPDX License Identifiers are a more compact / standardized way of representing file license information. See: https://spdx.dev/resources/use/#identifiers This was done with the `ambr` search and replace tool. ambr --no-parent-ignore --key-from-file --rep-from-file key.txt rep.txt *
58 lines
1.5 KiB
C++
58 lines
1.5 KiB
C++
/*
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* Copyright (c) 2020, Nico Weber <thakis@chromium.org>
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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 <math.h>
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#include <sys/time.h>
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#include <unistd.h>
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int main(int argc, char** argv)
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{
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#ifdef __serenity__
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if (pledge("stdio settime", nullptr) < 0) {
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perror("pledge");
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return 1;
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}
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#endif
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Core::ArgsParser args_parser;
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double delta = __builtin_nan("");
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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(argc, argv);
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if (__builtin_isnan(delta)) {
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#ifdef __serenity__
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if (pledge("stdio", nullptr) < 0) {
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perror("pledge");
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return 1;
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}
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#endif
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} else {
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long delta_us = static_cast<long>(round(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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if (adjtime(&delta_timeval, nullptr) < 0) {
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perror("adjtime set");
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return 1;
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}
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}
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timeval remaining_delta_timeval;
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if (adjtime(nullptr, &remaining_delta_timeval) < 0) {
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perror("adjtime get");
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return 1;
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}
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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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printf("%f\n", remaining_delta);
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return 0;
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}
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