63 lines
1.6 KiB
C++
63 lines
1.6 KiB
C++
/*
|
|
SPDX-FileCopyrightText: 2019 Vlad Zahorodnii <vlad.zahorodnii@kde.org>
|
|
|
|
SPDX-License-Identifier: GPL-2.0-or-later
|
|
*/
|
|
|
|
#include "clockskewnotifierengine_linux.h"
|
|
|
|
#include <QSocketNotifier>
|
|
|
|
#include <fcntl.h>
|
|
#include <sys/timerfd.h>
|
|
#include <unistd.h>
|
|
|
|
#ifndef TFD_TIMER_CANCEL_ON_SET // only available in newer glib
|
|
#define TFD_TIMER_CANCEL_ON_SET (1 << 1)
|
|
#endif
|
|
|
|
namespace KWin
|
|
{
|
|
|
|
LinuxClockSkewNotifierEngine *LinuxClockSkewNotifierEngine::create(QObject *parent)
|
|
{
|
|
const int fd = timerfd_create(CLOCK_REALTIME, O_CLOEXEC | O_NONBLOCK);
|
|
if (fd == -1) {
|
|
qWarning("Couldn't create clock skew notifier engine: %s", strerror(errno));
|
|
return nullptr;
|
|
}
|
|
|
|
const itimerspec spec = {};
|
|
const int ret = timerfd_settime(fd, TFD_TIMER_ABSTIME | TFD_TIMER_CANCEL_ON_SET, &spec, nullptr);
|
|
if (ret == -1) {
|
|
qWarning("Couldn't create clock skew notifier engine: %s", strerror(errno));
|
|
close(fd);
|
|
return nullptr;
|
|
}
|
|
|
|
return new LinuxClockSkewNotifierEngine(fd, parent);
|
|
}
|
|
|
|
LinuxClockSkewNotifierEngine::LinuxClockSkewNotifierEngine(int fd, QObject *parent)
|
|
: ClockSkewNotifierEngine(parent)
|
|
, m_fd(fd)
|
|
{
|
|
const QSocketNotifier *notifier = new QSocketNotifier(fd, QSocketNotifier::Read, this);
|
|
connect(notifier, &QSocketNotifier::activated, this, &LinuxClockSkewNotifierEngine::handleTimerCancelled);
|
|
}
|
|
|
|
LinuxClockSkewNotifierEngine::~LinuxClockSkewNotifierEngine()
|
|
{
|
|
close(m_fd);
|
|
}
|
|
|
|
void LinuxClockSkewNotifierEngine::handleTimerCancelled()
|
|
{
|
|
uint64_t expirationCount;
|
|
read(m_fd, &expirationCount, sizeof(expirationCount));
|
|
|
|
emit clockSkewed();
|
|
}
|
|
|
|
} // namespace KWin
|