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5fcd34b810
It's a thin userland wrapper around adjtime(2). It can be used to view current pending time adjustments, and root can use it to smoothly adjust the system time. As far as I can tell, other systems don't have a userland utility for this, but it seems useful. Useful enough that I'm adding it to the lagom build so I can use it on my linux box too :)
77 lines
2.7 KiB
C++
77 lines
2.7 KiB
C++
/*
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* Copyright (c) 2020, Nico Weber <thakis@chromium.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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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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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