Mac-4.7.4/src/corelib/io/qfilesystemwatcher.cpp - platform/external/qt - Git at Google

 /****************************************************************************
 **
 ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
 ** All rights reserved.
 ** Contact: Nokia Corporation (qt-info@nokia.com)
 **
 ** This file is part of the QtCore module of the Qt Toolkit.
 **
 ** $QT_BEGIN_LICENSE:LGPL$
 ** GNU Lesser General Public License Usage
 ** This file may be used under the terms of the GNU Lesser General Public
 ** License version 2.1 as published by the Free Software Foundation and
 ** appearing in the file LICENSE.LGPL included in the packaging of this
 ** file. Please review the following information to ensure the GNU Lesser
 ** General Public License version 2.1 requirements will be met:
 ** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
 **
 ** In addition, as a special exception, Nokia gives you certain additional
 ** rights. These rights are described in the Nokia Qt LGPL Exception
 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
 **
 ** GNU General Public License Usage
 ** Alternatively, this file may be used under the terms of the GNU General
 ** Public License version 3.0 as published by the Free Software Foundation
 ** and appearing in the file LICENSE.GPL included in the packaging of this
 ** file. Please review the following information to ensure the GNU General
 ** Public License version 3.0 requirements will be met:
 ** http://www.gnu.org/copyleft/gpl.html.
 **
 ** Other Usage
 ** Alternatively, this file may be used in accordance with the terms and
 ** conditions contained in a signed written agreement between you and Nokia.
 **
 **
 **
 **
 **
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 #include "qfilesystemwatcher.h"
 #include "qfilesystemwatcher_p.h"

 #ifndef QT_NO_FILESYSTEMWATCHER

 #include <qdatetime.h>
 #include <qdebug.h>
 #include <qdir.h>
 #include <qfileinfo.h>
 #include <qmutex.h>
 #include <qset.h>
 #include <qtimer.h>

 #if defined(Q_OS_WIN)
 #  include "qfilesystemwatcher_win_p.h"
 #elif defined(Q_OS_LINUX)
 #  include "qfilesystemwatcher_inotify_p.h"
 #  include "qfilesystemwatcher_dnotify_p.h"
 #elif defined(Q_OS_FREEBSD) || defined(Q_OS_MAC)
 #  if (defined Q_OS_MAC) && (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5)
 #  include "qfilesystemwatcher_fsevents_p.h"
 #  endif //MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5)
 #  include "qfilesystemwatcher_kqueue_p.h"
 #elif defined(Q_OS_SYMBIAN)
 #  include "qfilesystemwatcher_symbian_p.h"
 #endif

 QT_BEGIN_NAMESPACE

 enum { PollingInterval = 1000 };

 class QPollingFileSystemWatcherEngine : public QFileSystemWatcherEngine
 {
     Q_OBJECT

     class FileInfo
     {
         uint ownerId;
         uint groupId;
         QFile::Permissions permissions;
         QDateTime lastModified;
         QStringList entries;

     public:
         FileInfo(const QFileInfo &fileInfo)
             : ownerId(fileInfo.ownerId()),
               groupId(fileInfo.groupId()),
               permissions(fileInfo.permissions()),
               lastModified(fileInfo.lastModified())
         {
             if (fileInfo.isDir()) {
                 entries = fileInfo.absoluteDir().entryList(QDir::AllEntries);
             }
         }
         FileInfo &operator=(const QFileInfo &fileInfo)
         {
             *this = FileInfo(fileInfo);
             return *this;
         }

         bool operator!=(const QFileInfo &fileInfo) const
         {
             if (fileInfo.isDir() && entries != fileInfo.absoluteDir().entryList(QDir::AllEntries))
                 return true;
             return (ownerId != fileInfo.ownerId()
                     || groupId != fileInfo.groupId()
                     || permissions != fileInfo.permissions()
                     || lastModified != fileInfo.lastModified());
         }
     };

     mutable QMutex mutex;
     QHash<QString, FileInfo> files, directories;

 public:
     QPollingFileSystemWatcherEngine();

     void run();

     QStringList addPaths(const QStringList &paths, QStringList *files, QStringList *directories);
     QStringList removePaths(const QStringList &paths, QStringList *files, QStringList *directories);

     void stop();

 private Q_SLOTS:
     void timeout();
 };

 QPollingFileSystemWatcherEngine::QPollingFileSystemWatcherEngine()
 {
 #ifndef QT_NO_THREAD
     moveToThread(this);
 #endif
 }

 void QPollingFileSystemWatcherEngine::run()
 {
     QTimer timer;
     connect(&timer, SIGNAL(timeout()), SLOT(timeout()));
     timer.start(PollingInterval);
     (void) exec();
 }

 QStringList QPollingFileSystemWatcherEngine::addPaths(const QStringList &paths,
                                                       QStringList *files,
                                                       QStringList *directories)
 {
     QMutexLocker locker(&mutex);
     QStringList p = paths;
     QMutableListIterator<QString> it(p);
     while (it.hasNext()) {
         QString path = it.next();
         QFileInfo fi(path);
         if (!fi.exists())
             continue;
         if (fi.isDir()) {
             if (!directories->contains(path))
                 directories->append(path);
             if (!path.endsWith(QLatin1Char('/')))
                 fi = QFileInfo(path + QLatin1Char('/'));
             this->directories.insert(path, fi);
         } else {
             if (!files->contains(path))
                 files->append(path);
             this->files.insert(path, fi);
         }
         it.remove();
     }
     start();
     return p;
 }

 QStringList QPollingFileSystemWatcherEngine::removePaths(const QStringList &paths,
                                                          QStringList *files,
                                                          QStringList *directories)
 {
     QMutexLocker locker(&mutex);
     QStringList p = paths;
     QMutableListIterator<QString> it(p);
     while (it.hasNext()) {
         QString path = it.next();
         if (this->directories.remove(path)) {
             directories->removeAll(path);
             it.remove();
         } else if (this->files.remove(path)) {
             files->removeAll(path);
             it.remove();
         }
     }
     if (this->files.isEmpty() && this->directories.isEmpty()) {
         locker.unlock();
         stop();
         wait();
     }
     return p;
 }

 void QPollingFileSystemWatcherEngine::stop()
 {
     QMetaObject::invokeMethod(this, "quit");
 }

 void QPollingFileSystemWatcherEngine::timeout()
 {
     QMutexLocker locker(&mutex);
     QMutableHashIterator<QString, FileInfo> fit(files);
     while (fit.hasNext()) {
         QHash<QString, FileInfo>::iterator x = fit.next();
         QString path = x.key();
         QFileInfo fi(path);
         if (!fi.exists()) {
             fit.remove();
             emit fileChanged(path, true);
         } else if (x.value() != fi) {
             x.value() = fi;
             emit fileChanged(path, false);
         }
     }
     QMutableHashIterator<QString, FileInfo> dit(directories);
     while (dit.hasNext()) {
         QHash<QString, FileInfo>::iterator x = dit.next();
         QString path = x.key();
         QFileInfo fi(path);
         if (!path.endsWith(QLatin1Char('/')))
             fi = QFileInfo(path + QLatin1Char('/'));
         if (!fi.exists()) {
             dit.remove();
             emit directoryChanged(path, true);
         } else if (x.value() != fi) {
             fi.refresh();
             if (!fi.exists()) {
                 dit.remove();
                 emit directoryChanged(path, true);
             } else {
                 x.value() = fi;
                 emit directoryChanged(path, false);
             }
         }

     }
 }


 QFileSystemWatcherEngine *QFileSystemWatcherPrivate::createNativeEngine()
 {
 #if defined(Q_OS_WIN)
     return new QWindowsFileSystemWatcherEngine;
 #elif defined(Q_OS_LINUX)
     QFileSystemWatcherEngine *eng = QInotifyFileSystemWatcherEngine::create();
     if(!eng)
         eng = QDnotifyFileSystemWatcherEngine::create();
     return eng;
 #elif defined(Q_OS_FREEBSD) || defined(Q_OS_MAC)
 #  if 0 && defined(Q_OS_MAC) && (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5)
     if (QSysInfo::MacintoshVersion >= QSysInfo::MV_10_5)
         return QFSEventsFileSystemWatcherEngine::create();
     else
 #  endif
         return QKqueueFileSystemWatcherEngine::create();
 #elif defined(Q_OS_SYMBIAN)
     return new QSymbianFileSystemWatcherEngine;
 #else
     return 0;
 #endif
 }

 QFileSystemWatcherPrivate::QFileSystemWatcherPrivate()
     : native(0), poller(0), forced(0)
 {
 }

 void QFileSystemWatcherPrivate::init()
 {
     Q_Q(QFileSystemWatcher);
     native = createNativeEngine();
     if (native) {
         QObject::connect(native,
                          SIGNAL(fileChanged(QString,bool)),
                          q,
                          SLOT(_q_fileChanged(QString,bool)));
         QObject::connect(native,
                          SIGNAL(directoryChanged(QString,bool)),
                          q,
                          SLOT(_q_directoryChanged(QString,bool)));
     }
 }

 void QFileSystemWatcherPrivate::initForcedEngine(const QString &forceName)
 {
     if(forced)
         return;

     Q_Q(QFileSystemWatcher);

 #if defined(Q_OS_LINUX)
     if(forceName == QLatin1String("inotify")) {
         forced = QInotifyFileSystemWatcherEngine::create();
     } else if(forceName == QLatin1String("dnotify")) {
         forced = QDnotifyFileSystemWatcherEngine::create();
     }
 #else
     Q_UNUSED(forceName);
 #endif

     if(forced) {
         QObject::connect(forced,
                          SIGNAL(fileChanged(QString,bool)),
                          q,
                          SLOT(_q_fileChanged(QString,bool)));
         QObject::connect(forced,
                          SIGNAL(directoryChanged(QString,bool)),
                          q,
                          SLOT(_q_directoryChanged(QString,bool)));
     }
 }

 void QFileSystemWatcherPrivate::initPollerEngine()
 {
     if(poller)
         return;

     Q_Q(QFileSystemWatcher);
     poller = new QPollingFileSystemWatcherEngine; // that was a mouthful
     QObject::connect(poller,
                      SIGNAL(fileChanged(QString,bool)),
                      q,
                      SLOT(_q_fileChanged(QString,bool)));
     QObject::connect(poller,
                      SIGNAL(directoryChanged(QString,bool)),
                      q,
                      SLOT(_q_directoryChanged(QString,bool)));
 }

 void QFileSystemWatcherPrivate::_q_fileChanged(const QString &path, bool removed)
 {
     Q_Q(QFileSystemWatcher);
     if (!files.contains(path)) {
         // the path was removed after a change was detected, but before we delivered the signal
         return;
     }
     if (removed)
         files.removeAll(path);
     emit q->fileChanged(path);
 }

 void QFileSystemWatcherPrivate::_q_directoryChanged(const QString &path, bool removed)
 {
     Q_Q(QFileSystemWatcher);
     if (!directories.contains(path)) {
         // perhaps the path was removed after a change was detected, but before we delivered the signal
         return;
     }
     if (removed)
         directories.removeAll(path);
     emit q->directoryChanged(path);
 }


 /*!
     \class QFileSystemWatcher
     \brief The QFileSystemWatcher class provides an interface for monitoring files and directories for modifications.
     \ingroup io
     \since 4.2
     \reentrant

     QFileSystemWatcher monitors the file system for changes to files
     and directories by watching a list of specified paths.

     Call addPath() to watch a particular file or directory. Multiple
     paths can be added using the addPaths() function. Existing paths can
     be removed by using the removePath() and removePaths() functions.

     QFileSystemWatcher examines each path added to it. Files that have
     been added to the QFileSystemWatcher can be accessed using the
     files() function, and directories using the directories() function.

     The fileChanged() signal is emitted when a file has been modified,
     renamed or removed from disk. Similarly, the directoryChanged()
     signal is emitted when a directory or its contents is modified or
     removed.  Note that QFileSystemWatcher stops monitoring files once
     they have been renamed or removed from disk, and directories once
     they have been removed from disk.

     \note On systems running a Linux kernel without inotify support,
     file systems that contain watched paths cannot be unmounted.

     \note Windows CE does not support directory monitoring by
     default as this depends on the file system driver installed.

     \note The act of monitoring files and directories for
     modifications consumes system resources. This implies there is a
     limit to the number of files and directories your process can
     monitor simultaneously. On Mac OS X 10.4 and all BSD variants, for
     example, an open file descriptor is required for each monitored
     file. Some system limits the number of open file descriptors to 256
     by default. This means that addPath() and addPaths() will fail if
     your process tries to add more than 256 files or directories to
     the file system monitor. Also note that your process may have
     other file descriptors open in addition to the ones for files
     being monitored, and these other open descriptors also count in
     the total. Mac OS X 10.5 and up use a different backend and do not
     suffer from this issue.


     \sa QFile, QDir
 */


 /*!
     Constructs a new file system watcher object with the given \a parent.
 */
 QFileSystemWatcher::QFileSystemWatcher(QObject *parent)
     : QObject(*new QFileSystemWatcherPrivate, parent)
 {
     d_func()->init();
 }

 /*!
     Constructs a new file system watcher object with the given \a parent
     which monitors the specified \a paths list.
 */
 QFileSystemWatcher::QFileSystemWatcher(const QStringList &paths, QObject *parent)
     : QObject(*new QFileSystemWatcherPrivate, parent)
 {
     d_func()->init();
     addPaths(paths);
 }

 /*!
     Destroys the file system watcher.

     \note To avoid deadlocks on shutdown, all instances of QFileSystemWatcher
     need to be destroyed before QCoreApplication. Note that passing
     QCoreApplication::instance() as the parent object when creating
     QFileSystemWatcher is not sufficient.
 */
 QFileSystemWatcher::~QFileSystemWatcher()
 {
     Q_D(QFileSystemWatcher);
     if (d->native) {
         d->native->stop();
         d->native->wait();
         delete d->native;
         d->native = 0;
     }
     if (d->poller) {
         d->poller->stop();
         d->poller->wait();
         delete d->poller;
         d->poller = 0;
     }
     if (d->forced) {
         d->forced->stop();
         d->forced->wait();
         delete d->forced;
         d->forced = 0;
     }
 }

 /*!
     Adds \a path to the file system watcher if \a path exists. The
     path is not added if it does not exist, or if it is already being
     monitored by the file system watcher.

     If \a path specifies a directory, the directoryChanged() signal
     will be emitted when \a path is modified or removed from disk;
     otherwise the fileChanged() signal is emitted when \a path is
     modified, renamed or removed.

     \note There is a system dependent limit to the number of files and
     directories that can be monitored simultaneously. If this limit
     has been reached, \a path will not be added to the file system
     watcher, and a warning message will be printed to \e{stderr}.

     \sa addPaths(), removePath()
 */
 void QFileSystemWatcher::addPath(const QString &path)
 {
     if (path.isEmpty()) {
         qWarning("QFileSystemWatcher::addPath: path is empty");
         return;
     }
     addPaths(QStringList(path));
 }

 /*!
     Adds each path in \a paths to the file system watcher. Paths are
     not added if they not exist, or if they are already being
     monitored by the file system watcher.

     If a path specifies a directory, the directoryChanged() signal
     will be emitted when the path is modified or removed from disk;
     otherwise the fileChanged() signal is emitted when the path is
     modified, renamed, or removed.

     \note There is a system dependent limit to the number of files and
     directories that can be monitored simultaneously. If this limit
     has been reached, the excess \a paths will not be added to the
     file system watcher, and a warning message will be printed to
     \e{stderr} for each path that could not be added.

     \sa addPath(), removePaths()
 */
 void QFileSystemWatcher::addPaths(const QStringList &paths)
 {
     Q_D(QFileSystemWatcher);
     if (paths.isEmpty()) {
         qWarning("QFileSystemWatcher::addPaths: list is empty");
         return;
     }

     QStringList p = paths;
     QFileSystemWatcherEngine *engine = 0;

     if(!objectName().startsWith(QLatin1String("_qt_autotest_force_engine_"))) {
         // Normal runtime case - search intelligently for best engine
         if(d->native) {
             engine = d->native;
         } else {
             d_func()->initPollerEngine();
             engine = d->poller;
         }

     } else {
         // Autotest override case - use the explicitly selected engine only
         QString forceName = objectName().mid(26);
         if(forceName == QLatin1String("poller")) {
             qDebug() << "QFileSystemWatcher: skipping native engine, using only polling engine";
             d_func()->initPollerEngine();
             engine = d->poller;
         } else if(forceName == QLatin1String("native")) {
             qDebug() << "QFileSystemWatcher: skipping polling engine, using only native engine";
             engine = d->native;
         } else {
             qDebug() << "QFileSystemWatcher: skipping polling and native engine, using only explicit" << forceName << "engine";
             d_func()->initForcedEngine(forceName);
             engine = d->forced;
         }
     }

     if(engine)
         p = engine->addPaths(p, &d->files, &d->directories);

     if (!p.isEmpty())
         qWarning("QFileSystemWatcher: failed to add paths: %s",
                  qPrintable(p.join(QLatin1String(", "))));
 }

 /*!
     Removes the specified \a path from the file system watcher.

     \sa removePaths(), addPath()
 */
 void QFileSystemWatcher::removePath(const QString &path)
 {
     if (path.isEmpty()) {
         qWarning("QFileSystemWatcher::removePath: path is empty");
         return;
     }
     removePaths(QStringList(path));
 }

 /*!
     Removes the specified \a paths from the file system watcher.

     \sa removePath(), addPaths()
 */
 void QFileSystemWatcher::removePaths(const QStringList &paths)
 {
     if (paths.isEmpty()) {
         qWarning("QFileSystemWatcher::removePaths: list is empty");
         return;
     }
     Q_D(QFileSystemWatcher);
     QStringList p = paths;
     if (d->native)
         p = d->native->removePaths(p, &d->files, &d->directories);
     if (d->poller)
         p = d->poller->removePaths(p, &d->files, &d->directories);
     if (d->forced)
         p = d->forced->removePaths(p, &d->files, &d->directories);
 }

 /*!
     \fn void QFileSystemWatcher::fileChanged(const QString &path)

     This signal is emitted when the file at the specified \a path is
     modified, renamed or removed from disk.

     \sa directoryChanged()
 */

 /*!
     \fn void QFileSystemWatcher::directoryChanged(const QString &path)

     This signal is emitted when the directory at a specified \a path,
     is modified (e.g., when a file is added, modified or deleted) or
     removed from disk. Note that if there are several changes during a
     short period of time, some of the changes might not emit this
     signal. However, the last change in the sequence of changes will
     always generate this signal.

     \sa fileChanged()
 */

 /*!
     \fn QStringList QFileSystemWatcher::directories() const

     Returns a list of paths to directories that are being watched.

     \sa files()
 */

 /*!
     \fn QStringList QFileSystemWatcher::files() const

     Returns a list of paths to files that are being watched.

     \sa directories()
 */

 QStringList QFileSystemWatcher::directories() const
 {
     Q_D(const QFileSystemWatcher);
     return d->directories;
 }

 QStringList QFileSystemWatcher::files() const
 {
     Q_D(const QFileSystemWatcher);
     return d->files;
 }

 QT_END_NAMESPACE

 #include "moc_qfilesystemwatcher.cpp"

 #include "qfilesystemwatcher.moc"

 #endif // QT_NO_FILESYSTEMWATCHER
	/****************************************************************************
	**
	** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
	** All rights reserved.
	** Contact: Nokia Corporation (qt-info@nokia.com)
	**
	** This file is part of the QtCore module of the Qt Toolkit.
	**
	** $QT_BEGIN_LICENSE:LGPL$
	** GNU Lesser General Public License Usage
	** This file may be used under the terms of the GNU Lesser General Public
	** License version 2.1 as published by the Free Software Foundation and
	** appearing in the file LICENSE.LGPL included in the packaging of this
	** file. Please review the following information to ensure the GNU Lesser
	** General Public License version 2.1 requirements will be met:
	** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
	**
	** In addition, as a special exception, Nokia gives you certain additional
	** rights. These rights are described in the Nokia Qt LGPL Exception
	** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
	**
	** GNU General Public License Usage
	** Alternatively, this file may be used under the terms of the GNU General
	** Public License version 3.0 as published by the Free Software Foundation
	** and appearing in the file LICENSE.GPL included in the packaging of this
	** file. Please review the following information to ensure the GNU General
	** Public License version 3.0 requirements will be met:
	** http://www.gnu.org/copyleft/gpl.html.
	**
	** Other Usage
	** Alternatively, this file may be used in accordance with the terms and
	** conditions contained in a signed written agreement between you and Nokia.
	**
	**
	**
	**
	**
	** $QT_END_LICENSE$
	**
	****************************************************************************/

	#include "qfilesystemwatcher.h"
	#include "qfilesystemwatcher_p.h"

	#ifndef QT_NO_FILESYSTEMWATCHER

	#include <qdatetime.h>
	#include <qdebug.h>
	#include <qdir.h>
	#include <qfileinfo.h>
	#include <qmutex.h>
	#include <qset.h>
	#include <qtimer.h>

	#if defined(Q_OS_WIN)
	# include "qfilesystemwatcher_win_p.h"
	#elif defined(Q_OS_LINUX)
	# include "qfilesystemwatcher_inotify_p.h"
	# include "qfilesystemwatcher_dnotify_p.h"
	#elif defined(Q_OS_FREEBSD) \|\| defined(Q_OS_MAC)
	# if (defined Q_OS_MAC) && (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5)
	# include "qfilesystemwatcher_fsevents_p.h"
	# endif //MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5)
	# include "qfilesystemwatcher_kqueue_p.h"
	#elif defined(Q_OS_SYMBIAN)
	# include "qfilesystemwatcher_symbian_p.h"
	#endif

	QT_BEGIN_NAMESPACE

	enum { PollingInterval = 1000 };

	class QPollingFileSystemWatcherEngine : public QFileSystemWatcherEngine
	{
	Q_OBJECT

	class FileInfo
	{
	uint ownerId;
	uint groupId;
	QFile::Permissions permissions;
	QDateTime lastModified;
	QStringList entries;

	public:
	FileInfo(const QFileInfo &fileInfo)
	: ownerId(fileInfo.ownerId()),
	groupId(fileInfo.groupId()),
	permissions(fileInfo.permissions()),
	lastModified(fileInfo.lastModified())
	{
	if (fileInfo.isDir()) {
	entries = fileInfo.absoluteDir().entryList(QDir::AllEntries);
	}
	}
	FileInfo &operator=(const QFileInfo &fileInfo)
	{
	*this = FileInfo(fileInfo);
	return *this;
	}

	bool operator!=(const QFileInfo &fileInfo) const
	{
	if (fileInfo.isDir() && entries != fileInfo.absoluteDir().entryList(QDir::AllEntries))
	return true;
	return (ownerId != fileInfo.ownerId()
	\|\| groupId != fileInfo.groupId()
	\|\| permissions != fileInfo.permissions()
	\|\| lastModified != fileInfo.lastModified());
	}
	};

	mutable QMutex mutex;
	QHash<QString, FileInfo> files, directories;

	public:
	QPollingFileSystemWatcherEngine();

	void run();

	QStringList addPaths(const QStringList &paths, QStringList files, QStringList directories);
	QStringList removePaths(const QStringList &paths, QStringList files, QStringList directories);

	void stop();

	private Q_SLOTS:
	void timeout();
	};

	QPollingFileSystemWatcherEngine::QPollingFileSystemWatcherEngine()
	{
	#ifndef QT_NO_THREAD
	moveToThread(this);
	#endif
	}

	void QPollingFileSystemWatcherEngine::run()
	{
	QTimer timer;
	connect(&timer, SIGNAL(timeout()), SLOT(timeout()));
	timer.start(PollingInterval);
	(void) exec();
	}

	QStringList QPollingFileSystemWatcherEngine::addPaths(const QStringList &paths,
	QStringList *files,
	QStringList *directories)
	{
	QMutexLocker locker(&mutex);
	QStringList p = paths;
	QMutableListIterator<QString> it(p);
	while (it.hasNext()) {
	QString path = it.next();
	QFileInfo fi(path);
	if (!fi.exists())
	continue;
	if (fi.isDir()) {
	if (!directories->contains(path))
	directories->append(path);
	if (!path.endsWith(QLatin1Char('/')))
	fi = QFileInfo(path + QLatin1Char('/'));
	this->directories.insert(path, fi);
	} else {
	if (!files->contains(path))
	files->append(path);
	this->files.insert(path, fi);
	}
	it.remove();
	}
	start();
	return p;
	}

	QStringList QPollingFileSystemWatcherEngine::removePaths(const QStringList &paths,
	QStringList *files,
	QStringList *directories)
	{
	QMutexLocker locker(&mutex);
	QStringList p = paths;
	QMutableListIterator<QString> it(p);
	while (it.hasNext()) {
	QString path = it.next();
	if (this->directories.remove(path)) {
	directories->removeAll(path);
	it.remove();
	} else if (this->files.remove(path)) {
	files->removeAll(path);
	it.remove();
	}
	}
	if (this->files.isEmpty() && this->directories.isEmpty()) {
	locker.unlock();
	stop();
	wait();
	}
	return p;
	}

	void QPollingFileSystemWatcherEngine::stop()
	{
	QMetaObject::invokeMethod(this, "quit");
	}

	void QPollingFileSystemWatcherEngine::timeout()
	{
	QMutexLocker locker(&mutex);
	QMutableHashIterator<QString, FileInfo> fit(files);
	while (fit.hasNext()) {
	QHash<QString, FileInfo>::iterator x = fit.next();
	QString path = x.key();
	QFileInfo fi(path);
	if (!fi.exists()) {
	fit.remove();
	emit fileChanged(path, true);
	} else if (x.value() != fi) {
	x.value() = fi;
	emit fileChanged(path, false);
	}
	}
	QMutableHashIterator<QString, FileInfo> dit(directories);
	while (dit.hasNext()) {
	QHash<QString, FileInfo>::iterator x = dit.next();
	QString path = x.key();
	QFileInfo fi(path);
	if (!path.endsWith(QLatin1Char('/')))
	fi = QFileInfo(path + QLatin1Char('/'));
	if (!fi.exists()) {
	dit.remove();
	emit directoryChanged(path, true);
	} else if (x.value() != fi) {
	fi.refresh();
	if (!fi.exists()) {
	dit.remove();
	emit directoryChanged(path, true);
	} else {
	x.value() = fi;
	emit directoryChanged(path, false);
	}
	}

	}
	}




	QFileSystemWatcherEngine *QFileSystemWatcherPrivate::createNativeEngine()
	{
	#if defined(Q_OS_WIN)
	return new QWindowsFileSystemWatcherEngine;
	#elif defined(Q_OS_LINUX)
	QFileSystemWatcherEngine *eng = QInotifyFileSystemWatcherEngine::create();
	if(!eng)
	eng = QDnotifyFileSystemWatcherEngine::create();
	return eng;
	#elif defined(Q_OS_FREEBSD) \|\| defined(Q_OS_MAC)
	# if 0 && defined(Q_OS_MAC) && (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5)
	if (QSysInfo::MacintoshVersion >= QSysInfo::MV_10_5)
	return QFSEventsFileSystemWatcherEngine::create();
	else
	# endif
	return QKqueueFileSystemWatcherEngine::create();
	#elif defined(Q_OS_SYMBIAN)
	return new QSymbianFileSystemWatcherEngine;
	#else
	return 0;
	#endif
	}

	QFileSystemWatcherPrivate::QFileSystemWatcherPrivate()
	: native(0), poller(0), forced(0)
	{
	}

	void QFileSystemWatcherPrivate::init()
	{
	Q_Q(QFileSystemWatcher);
	native = createNativeEngine();
	if (native) {
	QObject::connect(native,
	SIGNAL(fileChanged(QString,bool)),
	q,
	SLOT(_q_fileChanged(QString,bool)));
	QObject::connect(native,
	SIGNAL(directoryChanged(QString,bool)),
	q,
	SLOT(_q_directoryChanged(QString,bool)));
	}
	}

	void QFileSystemWatcherPrivate::initForcedEngine(const QString &forceName)
	{
	if(forced)
	return;

	Q_Q(QFileSystemWatcher);

	#if defined(Q_OS_LINUX)
	if(forceName == QLatin1String("inotify")) {
	forced = QInotifyFileSystemWatcherEngine::create();
	} else if(forceName == QLatin1String("dnotify")) {
	forced = QDnotifyFileSystemWatcherEngine::create();
	}
	#else
	Q_UNUSED(forceName);
	#endif

	if(forced) {
	QObject::connect(forced,
	SIGNAL(fileChanged(QString,bool)),
	q,
	SLOT(_q_fileChanged(QString,bool)));
	QObject::connect(forced,
	SIGNAL(directoryChanged(QString,bool)),
	q,
	SLOT(_q_directoryChanged(QString,bool)));
	}
	}

	void QFileSystemWatcherPrivate::initPollerEngine()
	{
	if(poller)
	return;

	Q_Q(QFileSystemWatcher);
	poller = new QPollingFileSystemWatcherEngine; // that was a mouthful
	QObject::connect(poller,
	SIGNAL(fileChanged(QString,bool)),
	q,
	SLOT(_q_fileChanged(QString,bool)));
	QObject::connect(poller,
	SIGNAL(directoryChanged(QString,bool)),
	q,
	SLOT(_q_directoryChanged(QString,bool)));
	}

	void QFileSystemWatcherPrivate::_q_fileChanged(const QString &path, bool removed)
	{
	Q_Q(QFileSystemWatcher);
	if (!files.contains(path)) {
	// the path was removed after a change was detected, but before we delivered the signal
	return;
	}
	if (removed)
	files.removeAll(path);
	emit q->fileChanged(path);
	}

	void QFileSystemWatcherPrivate::_q_directoryChanged(const QString &path, bool removed)
	{
	Q_Q(QFileSystemWatcher);
	if (!directories.contains(path)) {
	// perhaps the path was removed after a change was detected, but before we delivered the signal
	return;
	}
	if (removed)
	directories.removeAll(path);
	emit q->directoryChanged(path);
	}



	/*!
	\class QFileSystemWatcher
	\brief The QFileSystemWatcher class provides an interface for monitoring files and directories for modifications.
	\ingroup io
	\since 4.2
	\reentrant

	QFileSystemWatcher monitors the file system for changes to files
	and directories by watching a list of specified paths.

	Call addPath() to watch a particular file or directory. Multiple
	paths can be added using the addPaths() function. Existing paths can
	be removed by using the removePath() and removePaths() functions.

	QFileSystemWatcher examines each path added to it. Files that have
	been added to the QFileSystemWatcher can be accessed using the
	files() function, and directories using the directories() function.

	The fileChanged() signal is emitted when a file has been modified,
	renamed or removed from disk. Similarly, the directoryChanged()
	signal is emitted when a directory or its contents is modified or
	removed. Note that QFileSystemWatcher stops monitoring files once
	they have been renamed or removed from disk, and directories once
	they have been removed from disk.

	\note On systems running a Linux kernel without inotify support,
	file systems that contain watched paths cannot be unmounted.

	\note Windows CE does not support directory monitoring by
	default as this depends on the file system driver installed.

	\note The act of monitoring files and directories for
	modifications consumes system resources. This implies there is a
	limit to the number of files and directories your process can
	monitor simultaneously. On Mac OS X 10.4 and all BSD variants, for
	example, an open file descriptor is required for each monitored
	file. Some system limits the number of open file descriptors to 256
	by default. This means that addPath() and addPaths() will fail if
	your process tries to add more than 256 files or directories to
	the file system monitor. Also note that your process may have
	other file descriptors open in addition to the ones for files
	being monitored, and these other open descriptors also count in
	the total. Mac OS X 10.5 and up use a different backend and do not
	suffer from this issue.


	\sa QFile, QDir
	*/


	/*!
	Constructs a new file system watcher object with the given \a parent.
	*/
	QFileSystemWatcher::QFileSystemWatcher(QObject *parent)
	: QObject(*new QFileSystemWatcherPrivate, parent)
	{
	d_func()->init();
	}

	/*!
	Constructs a new file system watcher object with the given \a parent
	which monitors the specified \a paths list.
	*/
	QFileSystemWatcher::QFileSystemWatcher(const QStringList &paths, QObject *parent)
	: QObject(*new QFileSystemWatcherPrivate, parent)
	{
	d_func()->init();
	addPaths(paths);
	}

	/*!
	Destroys the file system watcher.

	\note To avoid deadlocks on shutdown, all instances of QFileSystemWatcher
	need to be destroyed before QCoreApplication. Note that passing
	QCoreApplication::instance() as the parent object when creating
	QFileSystemWatcher is not sufficient.
	*/
	QFileSystemWatcher::~QFileSystemWatcher()
	{
	Q_D(QFileSystemWatcher);
	if (d->native) {
	d->native->stop();
	d->native->wait();
	delete d->native;
	d->native = 0;
	}
	if (d->poller) {
	d->poller->stop();
	d->poller->wait();
	delete d->poller;
	d->poller = 0;
	}
	if (d->forced) {
	d->forced->stop();
	d->forced->wait();
	delete d->forced;
	d->forced = 0;
	}
	}

	/*!
	Adds \a path to the file system watcher if \a path exists. The
	path is not added if it does not exist, or if it is already being
	monitored by the file system watcher.

	If \a path specifies a directory, the directoryChanged() signal
	will be emitted when \a path is modified or removed from disk;
	otherwise the fileChanged() signal is emitted when \a path is
	modified, renamed or removed.

	\note There is a system dependent limit to the number of files and
	directories that can be monitored simultaneously. If this limit
	has been reached, \a path will not be added to the file system
	watcher, and a warning message will be printed to \e{stderr}.

	\sa addPaths(), removePath()
	*/
	void QFileSystemWatcher::addPath(const QString &path)
	{
	if (path.isEmpty()) {
	qWarning("QFileSystemWatcher::addPath: path is empty");
	return;
	}
	addPaths(QStringList(path));
	}

	/*!
	Adds each path in \a paths to the file system watcher. Paths are
	not added if they not exist, or if they are already being
	monitored by the file system watcher.

	If a path specifies a directory, the directoryChanged() signal
	will be emitted when the path is modified or removed from disk;
	otherwise the fileChanged() signal is emitted when the path is
	modified, renamed, or removed.

	\note There is a system dependent limit to the number of files and
	directories that can be monitored simultaneously. If this limit
	has been reached, the excess \a paths will not be added to the
	file system watcher, and a warning message will be printed to
	\e{stderr} for each path that could not be added.

	\sa addPath(), removePaths()
	*/
	void QFileSystemWatcher::addPaths(const QStringList &paths)
	{
	Q_D(QFileSystemWatcher);
	if (paths.isEmpty()) {
	qWarning("QFileSystemWatcher::addPaths: list is empty");
	return;
	}

	QStringList p = paths;
	QFileSystemWatcherEngine *engine = 0;

	if(!objectName().startsWith(QLatin1String("_qt_autotest_force_engine_"))) {
	// Normal runtime case - search intelligently for best engine
	if(d->native) {
	engine = d->native;
	} else {
	d_func()->initPollerEngine();
	engine = d->poller;
	}

	} else {
	// Autotest override case - use the explicitly selected engine only
	QString forceName = objectName().mid(26);
	if(forceName == QLatin1String("poller")) {
	qDebug() << "QFileSystemWatcher: skipping native engine, using only polling engine";
	d_func()->initPollerEngine();
	engine = d->poller;
	} else if(forceName == QLatin1String("native")) {
	qDebug() << "QFileSystemWatcher: skipping polling engine, using only native engine";
	engine = d->native;
	} else {
	qDebug() << "QFileSystemWatcher: skipping polling and native engine, using only explicit" << forceName << "engine";
	d_func()->initForcedEngine(forceName);
	engine = d->forced;
	}
	}

	if(engine)
	p = engine->addPaths(p, &d->files, &d->directories);

	if (!p.isEmpty())
	qWarning("QFileSystemWatcher: failed to add paths: %s",
	qPrintable(p.join(QLatin1String(", "))));
	}

	/*!
	Removes the specified \a path from the file system watcher.

	\sa removePaths(), addPath()
	*/
	void QFileSystemWatcher::removePath(const QString &path)
	{
	if (path.isEmpty()) {
	qWarning("QFileSystemWatcher::removePath: path is empty");
	return;
	}
	removePaths(QStringList(path));
	}

	/*!
	Removes the specified \a paths from the file system watcher.

	\sa removePath(), addPaths()
	*/
	void QFileSystemWatcher::removePaths(const QStringList &paths)
	{
	if (paths.isEmpty()) {
	qWarning("QFileSystemWatcher::removePaths: list is empty");
	return;
	}
	Q_D(QFileSystemWatcher);
	QStringList p = paths;
	if (d->native)
	p = d->native->removePaths(p, &d->files, &d->directories);
	if (d->poller)
	p = d->poller->removePaths(p, &d->files, &d->directories);
	if (d->forced)
	p = d->forced->removePaths(p, &d->files, &d->directories);
	}

	/*!
	\fn void QFileSystemWatcher::fileChanged(const QString &path)

	This signal is emitted when the file at the specified \a path is
	modified, renamed or removed from disk.

	\sa directoryChanged()
	*/

	/*!
	\fn void QFileSystemWatcher::directoryChanged(const QString &path)

	This signal is emitted when the directory at a specified \a path,
	is modified (e.g., when a file is added, modified or deleted) or
	removed from disk. Note that if there are several changes during a
	short period of time, some of the changes might not emit this
	signal. However, the last change in the sequence of changes will
	always generate this signal.

	\sa fileChanged()
	*/

	/*!
	\fn QStringList QFileSystemWatcher::directories() const

	Returns a list of paths to directories that are being watched.

	\sa files()
	*/

	/*!
	\fn QStringList QFileSystemWatcher::files() const

	Returns a list of paths to files that are being watched.

	\sa directories()
	*/

	QStringList QFileSystemWatcher::directories() const
	{
	Q_D(const QFileSystemWatcher);
	return d->directories;
	}

	QStringList QFileSystemWatcher::files() const
	{
	Q_D(const QFileSystemWatcher);
	return d->files;
	}

	QT_END_NAMESPACE

	#include "moc_qfilesystemwatcher.cpp"

	#include "qfilesystemwatcher.moc"

	#endif // QT_NO_FILESYSTEMWATCHER