265 lines
8.1 KiB
C++
265 lines
8.1 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
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** Contact: http://www.qt-project.org/legal
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**
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** This file is part of the QtCore module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and Digia. For licensing terms and
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** conditions see http://qt.digia.com/licensing. For further information
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** use the contact form at http://qt.digia.com/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Digia gives you certain additional
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** rights. These rights are described in the Digia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3.0 as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU General Public License version 3.0 requirements will be
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** met: http://www.gnu.org/copyleft/gpl.html.
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include <qplatformdefs.h>
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#include "qfilesystemwatcher.h"
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#include "qfilesystemwatcher_kqueue_p.h"
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#include "private/qcore_unix_p.h"
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#ifndef QT_NO_FILESYSTEMWATCHER
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#include <qdebug.h>
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#include <qfile.h>
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#include <qsocketnotifier.h>
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#include <qvarlengtharray.h>
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#include <sys/types.h>
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#include <sys/event.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <fcntl.h>
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QT_BEGIN_NAMESPACE
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// #define KEVENT_DEBUG
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#ifdef KEVENT_DEBUG
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# define DEBUG qDebug
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#else
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# define DEBUG if(false)qDebug
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#endif
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QKqueueFileSystemWatcherEngine *QKqueueFileSystemWatcherEngine::create(QObject *parent)
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{
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int kqfd = kqueue();
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if (kqfd == -1)
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return 0;
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return new QKqueueFileSystemWatcherEngine(kqfd, parent);
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}
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QKqueueFileSystemWatcherEngine::QKqueueFileSystemWatcherEngine(int kqfd, QObject *parent)
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: QFileSystemWatcherEngine(parent),
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kqfd(kqfd),
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notifier(kqfd, QSocketNotifier::Read, this)
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{
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connect(¬ifier, SIGNAL(activated(int)), SLOT(readFromKqueue()));
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fcntl(kqfd, F_SETFD, FD_CLOEXEC);
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}
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QKqueueFileSystemWatcherEngine::~QKqueueFileSystemWatcherEngine()
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{
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notifier.setEnabled(false);
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close(kqfd);
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foreach (int id, pathToID)
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::close(id < 0 ? -id : id);
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}
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QStringList QKqueueFileSystemWatcherEngine::addPaths(const QStringList &paths,
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QStringList *files,
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QStringList *directories)
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{
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QStringList p = paths;
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QMutableListIterator<QString> it(p);
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while (it.hasNext()) {
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QString path = it.next();
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int fd;
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#if defined(O_EVTONLY)
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fd = qt_safe_open(QFile::encodeName(path), O_EVTONLY);
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#else
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fd = qt_safe_open(QFile::encodeName(path), O_RDONLY);
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#endif
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if (fd == -1) {
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perror("QKqueueFileSystemWatcherEngine::addPaths: open");
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continue;
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}
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if (fd >= (int)FD_SETSIZE / 2 && fd < (int)FD_SETSIZE) {
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int fddup = fcntl(fd, F_DUPFD, FD_SETSIZE);
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if (fddup != -1) {
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::close(fd);
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fd = fddup;
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}
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}
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fcntl(fd, F_SETFD, FD_CLOEXEC);
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QT_STATBUF st;
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if (QT_FSTAT(fd, &st) == -1) {
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perror("QKqueueFileSystemWatcherEngine::addPaths: fstat");
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::close(fd);
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continue;
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}
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int id = (S_ISDIR(st.st_mode)) ? -fd : fd;
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if (id < 0) {
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if (directories->contains(path)) {
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::close(fd);
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continue;
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}
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} else {
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if (files->contains(path)) {
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::close(fd);
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continue;
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}
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}
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struct kevent kev;
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EV_SET(&kev,
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fd,
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EVFILT_VNODE,
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EV_ADD | EV_ENABLE | EV_CLEAR,
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NOTE_DELETE | NOTE_WRITE | NOTE_EXTEND | NOTE_ATTRIB | NOTE_RENAME | NOTE_REVOKE,
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0,
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0);
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if (kevent(kqfd, &kev, 1, 0, 0, 0) == -1) {
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perror("QKqueueFileSystemWatcherEngine::addPaths: kevent");
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::close(fd);
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continue;
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}
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it.remove();
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if (id < 0) {
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DEBUG() << "QKqueueFileSystemWatcherEngine: added directory path" << path;
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directories->append(path);
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} else {
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DEBUG() << "QKqueueFileSystemWatcherEngine: added file path" << path;
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files->append(path);
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}
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pathToID.insert(path, id);
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idToPath.insert(id, path);
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}
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return p;
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}
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QStringList QKqueueFileSystemWatcherEngine::removePaths(const QStringList &paths,
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QStringList *files,
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QStringList *directories)
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{
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bool isEmpty;
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QStringList p = paths;
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if (pathToID.isEmpty())
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return p;
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QMutableListIterator<QString> it(p);
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while (it.hasNext()) {
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QString path = it.next();
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int id = pathToID.take(path);
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QString x = idToPath.take(id);
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if (x.isEmpty() || x != path)
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continue;
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::close(id < 0 ? -id : id);
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it.remove();
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if (id < 0)
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directories->removeAll(path);
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else
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files->removeAll(path);
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}
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isEmpty = pathToID.isEmpty();
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return p;
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}
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void QKqueueFileSystemWatcherEngine::readFromKqueue()
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{
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forever {
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DEBUG() << "QKqueueFileSystemWatcherEngine: polling for changes";
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int r;
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struct kevent kev;
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struct timespec ts = { 0, 0 }; // 0 ts, because we want to poll
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EINTR_LOOP(r, kevent(kqfd, 0, 0, &kev, 1, &ts));
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if (r < 0) {
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perror("QKqueueFileSystemWatcherEngine: error during kevent wait");
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return;
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} else if (r == 0) {
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// polling returned no events, so stop
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break;
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} else {
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int fd = kev.ident;
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DEBUG() << "QKqueueFileSystemWatcherEngine: processing kevent" << kev.ident << kev.filter;
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int id = fd;
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QString path = idToPath.value(id);
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if (path.isEmpty()) {
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// perhaps a directory?
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id = -id;
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path = idToPath.value(id);
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if (path.isEmpty()) {
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DEBUG() << "QKqueueFileSystemWatcherEngine: received a kevent for a file we're not watching";
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continue;
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}
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}
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if (kev.filter != EVFILT_VNODE) {
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DEBUG() << "QKqueueFileSystemWatcherEngine: received a kevent with the wrong filter";
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continue;
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}
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if ((kev.fflags & (NOTE_DELETE | NOTE_REVOKE | NOTE_RENAME)) != 0) {
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DEBUG() << path << "removed, removing watch also";
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pathToID.remove(path);
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idToPath.remove(id);
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::close(fd);
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if (id < 0)
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emit directoryChanged(path, true);
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else
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emit fileChanged(path, true);
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} else {
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DEBUG() << path << "changed";
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if (id < 0)
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emit directoryChanged(path, false);
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else
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emit fileChanged(path, false);
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}
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}
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}
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}
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#endif //QT_NO_FILESYSTEMWATCHER
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QT_END_NAMESPACE
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