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/*
* Copyright (c) 2020, Nico Weber <thakis@chromium.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibCore/ArgsParser.h>
#include <math.h>
#include <sys/time.h>
#include <unistd.h>
int main(int argc, char** argv)
{
#ifdef __serenity__
if (pledge("stdio settime", nullptr) < 0) {
perror("pledge");
return 1;
}
#endif
Core::ArgsParser args_parser;
double delta = __builtin_nan("");
args_parser.add_option(delta, "Adjust system time by this many seconds", "set", 's', "delta_seconds");
args_parser.parse(argc, argv);
if (__builtin_isnan(delta)) {
#ifdef __serenity__
if (pledge("stdio", nullptr) < 0) {
perror("pledge");
return 1;
}
#endif
} else {
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;
}
if (adjtime(&delta_timeval, nullptr) < 0) {
perror("adjtime set");
return 1;
}
}
timeval remaining_delta_timeval;
if (adjtime(nullptr, &remaining_delta_timeval) < 0) {
perror("adjtime get");
return 1;
}
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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