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/*
* Copyright (c) 2021, Brian Gianforcaro <bgianf@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Atomic.h>
#include <AK/Time.h>
#include <LibCore/ElapsedTimer.h>
#include <LibTest/TestCase.h>
#include <signal.h>
#include <signal_numbers.h>
#include <unistd.h>
class SuccessContext {
public:
static Atomic<bool> alarm_fired;
static Core::ElapsedTimer signal_timer;
static constexpr auto timer_value = Time::from_seconds(1);
static void test_signal_handler(int signal)
{
auto actual_duration = Time::from_milliseconds(SuccessContext::signal_timer.elapsed());
auto expected_duration = SuccessContext::timer_value;
// Add a small buffer to allow for latency on the system.
constexpr auto buffer_duration = Time::from_milliseconds(50);
dbgln("Signal Times - Actual: {} Expected: {}", actual_duration.to_milliseconds(), expected_duration.to_milliseconds());
EXPECT(actual_duration >= expected_duration);
EXPECT(actual_duration < expected_duration + buffer_duration);
EXPECT_EQ(signal, SIGALRM);
SuccessContext::alarm_fired = true;
}
};
Atomic<bool> SuccessContext::alarm_fired { false };
Core::ElapsedTimer SuccessContext::signal_timer {};
TEST_CASE(success_case)
{
signal(SIGALRM, SuccessContext::test_signal_handler);
SuccessContext::signal_timer.start();
auto previous_time = alarm(SuccessContext::timer_value.to_seconds());
EXPECT_EQ(previous_time, 0u);
auto sleep_time = SuccessContext::timer_value + Time::from_seconds(1);
sleep(sleep_time.to_seconds());
EXPECT(SuccessContext::alarm_fired);
}
// Regression test for issues #9071
// See: https://github.com/SerenityOS/serenity/issues/9071
TEST_CASE(regression_inifinite_loop)
{
constexpr auto hour_long_timer_value = Time::from_seconds(60 * 60);
// Create an alarm timer significantly far into the future.
auto previous_time = alarm(hour_long_timer_value.to_seconds());
EXPECT_EQ(previous_time, 0u);
// Update the alarm with a zero value before the previous timer expires.
previous_time = alarm(0);
EXPECT_EQ(previous_time, hour_long_timer_value.to_seconds());
// Update the alarm with a zero value again, this shouldn't get stuck
// in an infinite loop trying to cancel the previous timer in the kernel.
previous_time = alarm(0);
EXPECT_EQ(previous_time, 0u);
}
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