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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <LibCore/ArgsParser.h>
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
static volatile bool g_interrupted;
static void handle_sigint(int)
{
g_interrupted = true;
}
int main(int argc, char** argv)
{
double secs;
Core::ArgsParser args_parser;
args_parser.add_positional_argument(secs, "Number of seconds to sleep for", "num-seconds");
args_parser.parse(argc, argv);
struct sigaction sa;
memset(&sa, 0, sizeof(struct sigaction));
sa.sa_handler = handle_sigint;
sigaction(SIGINT, &sa, nullptr);
if (pledge("stdio sigaction", nullptr) < 0) {
perror("pledge");
return 1;
}
double whole_seconds = static_cast<time_t>(secs);
double fraction = secs - whole_seconds;
timespec requested_sleep {
.tv_sec = static_cast<time_t>(whole_seconds),
.tv_nsec = static_cast<long>(fraction * (double)1000000000),
};
timespec remaining_sleep {};
if (clock_nanosleep(CLOCK_MONOTONIC, 0, &requested_sleep, &remaining_sleep) < 0) {
if (errno != EINTR) {
perror("clock_nanosleep");
return 1;
}
}
if (remaining_sleep.tv_sec || remaining_sleep.tv_nsec) {
outln("Sleep interrupted with {}.{} seconds remaining.", remaining_sleep.tv_sec, remaining_sleep.tv_nsec);
}
signal(SIGINT, SIG_DFL);
if (g_interrupted)
raise(SIGINT);
return 0;
}
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