mirror of
https://bitbucket.org/smil3y/kdelibs.git
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107 lines
2.9 KiB
C++
107 lines
2.9 KiB
C++
/* This file is part of the KDE libraries
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Copyright (C) 2022 Ivailo Monev <xakepa10@gmail.com>
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License version 2, as published by the Free Software Foundation.
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This library 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 GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public License
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along with this library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA.
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*/
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#include "klockfile.h"
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#include "kglobal.h"
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#include "kstandarddirs.h"
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#include "kdebug.h"
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#include "kde_file.h"
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#include <QStandardPaths>
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#include <QCoreApplication>
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#include <QThread>
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#include <sys/types.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <errno.h>
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#define KLOCKFILE_TIMEOUT 150
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#define KLOCKFILE_SLEEPTIME 50
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class KLockFilePrivate
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{
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public:
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KLockFilePrivate();
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QString m_lockname;
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QByteArray m_lockfile;
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int m_lockfd;
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};
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KLockFilePrivate::KLockFilePrivate()
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: m_lockfd(-1)
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{
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}
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KLockFile::KLockFile(const QString &file)
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: d(new KLockFilePrivate())
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{
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d->m_lockname = file;
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// NOTE: KConfig may attempt to create KLockFile from its destructor when KGlobal is no more
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// thus QStandardPaths::writableLocation() is used here
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d->m_lockfile = QFile::encodeName(QStandardPaths::writableLocation(QStandardPaths::RuntimeLocation));
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d->m_lockfile.append('/');
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d->m_lockfile.append(QByteArray::number(qHash(file)));
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d->m_lockfile.append(".klockfile");
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}
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KLockFile::~KLockFile()
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{
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unlock();
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d->m_lockfile.clear();
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delete d;
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}
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bool KLockFile::tryLock()
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{
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if (d->m_lockfd != -1) {
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return true;
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}
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d->m_lockfd = KDE_open(d->m_lockfile.constData(), O_WRONLY | O_CREAT | O_EXCL, 0644);
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return (d->m_lockfd != -1);
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}
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void KLockFile::lock()
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{
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kDebug() << "locking" << d->m_lockname << d->m_lockfile;
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while (!tryLock() && !d->m_lockfile.isEmpty()) {
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QCoreApplication::processEvents(QEventLoop::AllEvents, KLOCKFILE_TIMEOUT);
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QThread::msleep(KLOCKFILE_SLEEPTIME);
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}
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kDebug() << "locked" << d->m_lockname << d->m_lockfile;
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}
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bool KLockFile::isLocked() const
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{
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return (d->m_lockfd != -1);
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}
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void KLockFile::unlock()
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{
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if (d->m_lockfd != -1) {
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QT_CLOSE(d->m_lockfd);
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if (Q_UNLIKELY(::unlink(d->m_lockfile.constData()) == -1)) {
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const int savederrno = errno;
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kWarning() << "could not remove lock file" << qt_error_string(savederrno);
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}
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d->m_lockfd = -1;
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kDebug() << "unlocked" << d->m_lockname << d->m_lockfile;
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}
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}
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