75 lines
2.3 KiB
C++
75 lines
2.3 KiB
C++
/*
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* Copyright (C) 2019 Vlad Zahorodnii <vlad.zahorodnii@kde.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "clockskewnotifierengine_linux.h"
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#include <QSocketNotifier>
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#include <fcntl.h>
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#include <sys/timerfd.h>
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#include <unistd.h>
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#ifndef TFD_TIMER_CANCEL_ON_SET // only available in newer glib
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#define TFD_TIMER_CANCEL_ON_SET (1 << 1)
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#endif
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namespace KWin
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{
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LinuxClockSkewNotifierEngine *LinuxClockSkewNotifierEngine::create(QObject *parent)
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{
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const int fd = timerfd_create(CLOCK_REALTIME, O_CLOEXEC | O_NONBLOCK);
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if (fd == -1) {
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qWarning("Couldn't create clock skew notifier engine: %s", strerror(errno));
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return nullptr;
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}
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const itimerspec spec = {};
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const int ret = timerfd_settime(fd, TFD_TIMER_ABSTIME | TFD_TIMER_CANCEL_ON_SET, &spec, nullptr);
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if (ret == -1) {
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qWarning("Couldn't create clock skew notifier engine: %s", strerror(errno));
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close(fd);
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return nullptr;
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}
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return new LinuxClockSkewNotifierEngine(fd, parent);
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}
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LinuxClockSkewNotifierEngine::LinuxClockSkewNotifierEngine(int fd, QObject *parent)
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: ClockSkewNotifierEngine(parent)
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, m_fd(fd)
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{
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const QSocketNotifier *notifier = new QSocketNotifier(fd, QSocketNotifier::Read, this);
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connect(notifier, &QSocketNotifier::activated, this, &LinuxClockSkewNotifierEngine::handleTimerCancelled);
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}
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LinuxClockSkewNotifierEngine::~LinuxClockSkewNotifierEngine()
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{
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close(m_fd);
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}
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void LinuxClockSkewNotifierEngine::handleTimerCancelled()
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{
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uint64_t expirationCount;
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read(m_fd, &expirationCount, sizeof(expirationCount));
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emit clockSkewed();
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}
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} // namespace KWin
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