From 38be0d13830efd2d98281c645c3a60afe05ffece Mon Sep 17 00:00:00 2001 From: Qt by Nokia Date: Wed, 27 Apr 2011 12:05:43 +0200 Subject: Initial import from the monolithic Qt. This is the beginning of revision history for this module. If you want to look at revision history older than this, please refer to the Qt Git wiki for how to use Git history grafting. At the time of writing, this wiki is located here: http://qt.gitorious.org/qt/pages/GitIntroductionWithQt If you have already performed the grafting and you don't see any history beyond this commit, try running "git log" with the "--follow" argument. Branched from the monolithic repo, Qt master branch, at commit 896db169ea224deb96c59ce8af800d019de63f12 --- src/corelib/io/qfilesystemwatcher_kqueue.cpp | 334 +++++++++++++++++++++++++++ 1 file changed, 334 insertions(+) create mode 100644 src/corelib/io/qfilesystemwatcher_kqueue.cpp (limited to 'src/corelib/io/qfilesystemwatcher_kqueue.cpp') diff --git a/src/corelib/io/qfilesystemwatcher_kqueue.cpp b/src/corelib/io/qfilesystemwatcher_kqueue.cpp new file mode 100644 index 0000000000..6c36a82fd1 --- /dev/null +++ b/src/corelib/io/qfilesystemwatcher_kqueue.cpp @@ -0,0 +1,334 @@ +/**************************************************************************** +** +** 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. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the Technology Preview License Agreement accompanying +** this package. +** +** GNU Lesser General Public License Usage +** Alternatively, 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. +** +** If you have questions regarding the use of this file, please contact +** Nokia at qt-info@nokia.com. +** +** +** +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include + +#include "qfilesystemwatcher.h" +#include "qfilesystemwatcher_kqueue_p.h" +#include "private/qcore_unix_p.h" + +#ifndef QT_NO_FILESYSTEMWATCHER + +#include +#include +#include +#include + +#include +#include +#include +#include +#include + +QT_BEGIN_NAMESPACE + +// #define KEVENT_DEBUG +#ifdef KEVENT_DEBUG +# define DEBUG qDebug +#else +# define DEBUG if(false)qDebug +#endif + +QKqueueFileSystemWatcherEngine *QKqueueFileSystemWatcherEngine::create() +{ + int kqfd = kqueue(); + if (kqfd == -1) + return 0; + return new QKqueueFileSystemWatcherEngine(kqfd); +} + +QKqueueFileSystemWatcherEngine::QKqueueFileSystemWatcherEngine(int kqfd) + : kqfd(kqfd) +{ + fcntl(kqfd, F_SETFD, FD_CLOEXEC); + + if (pipe(kqpipe) == -1) { + perror("QKqueueFileSystemWatcherEngine: cannot create pipe"); + kqpipe[0] = kqpipe[1] = -1; + return; + } + fcntl(kqpipe[0], F_SETFD, FD_CLOEXEC); + fcntl(kqpipe[1], F_SETFD, FD_CLOEXEC); + + struct kevent kev; + EV_SET(&kev, + kqpipe[0], + EVFILT_READ, + EV_ADD | EV_ENABLE, + 0, + 0, + 0); + if (kevent(kqfd, &kev, 1, 0, 0, 0) == -1) { + perror("QKqueueFileSystemWatcherEngine: cannot watch pipe, kevent returned"); + return; + } +} + +QKqueueFileSystemWatcherEngine::~QKqueueFileSystemWatcherEngine() +{ + stop(); + wait(); + + close(kqfd); + close(kqpipe[0]); + close(kqpipe[1]); + + foreach (int id, pathToID) + ::close(id < 0 ? -id : id); +} + +QStringList QKqueueFileSystemWatcherEngine::addPaths(const QStringList &paths, + QStringList *files, + QStringList *directories) +{ + QStringList p = paths; + { + QMutexLocker locker(&mutex); + + QMutableListIterator it(p); + while (it.hasNext()) { + QString path = it.next(); + int fd; +#if defined(O_EVTONLY) + fd = qt_safe_open(QFile::encodeName(path), O_EVTONLY); +#else + fd = qt_safe_open(QFile::encodeName(path), O_RDONLY); +#endif + if (fd == -1) { + perror("QKqueueFileSystemWatcherEngine::addPaths: open"); + continue; + } + if (fd >= (int)FD_SETSIZE / 2 && fd < (int)FD_SETSIZE) { + int fddup = fcntl(fd, F_DUPFD, FD_SETSIZE); + if (fddup != -1) { + ::close(fd); + fd = fddup; + } + } + fcntl(fd, F_SETFD, FD_CLOEXEC); + + QT_STATBUF st; + if (QT_FSTAT(fd, &st) == -1) { + perror("QKqueueFileSystemWatcherEngine::addPaths: fstat"); + ::close(fd); + continue; + } + int id = (S_ISDIR(st.st_mode)) ? -fd : fd; + if (id < 0) { + if (directories->contains(path)) { + ::close(fd); + continue; + } + } else { + if (files->contains(path)) { + ::close(fd); + continue; + } + } + + struct kevent kev; + EV_SET(&kev, + fd, + EVFILT_VNODE, + EV_ADD | EV_ENABLE | EV_CLEAR, + NOTE_DELETE | NOTE_WRITE | NOTE_EXTEND | NOTE_ATTRIB | NOTE_RENAME | NOTE_REVOKE, + 0, + 0); + if (kevent(kqfd, &kev, 1, 0, 0, 0) == -1) { + perror("QKqueueFileSystemWatcherEngine::addPaths: kevent"); + ::close(fd); + continue; + } + + it.remove(); + if (id < 0) { + DEBUG() << "QKqueueFileSystemWatcherEngine: added directory path" << path; + directories->append(path); + } else { + DEBUG() << "QKqueueFileSystemWatcherEngine: added file path" << path; + files->append(path); + } + + pathToID.insert(path, id); + idToPath.insert(id, path); + } + } + + if (!isRunning()) + start(); + else + write(kqpipe[1], "@", 1); + + return p; +} + +QStringList QKqueueFileSystemWatcherEngine::removePaths(const QStringList &paths, + QStringList *files, + QStringList *directories) +{ + bool isEmpty; + QStringList p = paths; + { + QMutexLocker locker(&mutex); + if (pathToID.isEmpty()) + return p; + + QMutableListIterator it(p); + while (it.hasNext()) { + QString path = it.next(); + int id = pathToID.take(path); + QString x = idToPath.take(id); + if (x.isEmpty() || x != path) + continue; + + ::close(id < 0 ? -id : id); + + it.remove(); + if (id < 0) + directories->removeAll(path); + else + files->removeAll(path); + } + isEmpty = pathToID.isEmpty(); + } + + if (isEmpty) { + stop(); + wait(); + } else { + write(kqpipe[1], "@", 1); + } + + return p; +} + +void QKqueueFileSystemWatcherEngine::stop() +{ + write(kqpipe[1], "q", 1); +} + +void QKqueueFileSystemWatcherEngine::run() +{ + forever { + int r; + struct kevent kev; + DEBUG() << "QKqueueFileSystemWatcherEngine: waiting for kevents..."; + EINTR_LOOP(r, kevent(kqfd, 0, 0, &kev, 1, 0)); + if (r < 0) { + perror("QKqueueFileSystemWatcherEngine: error during kevent wait"); + return; + } else { + int fd = kev.ident; + + DEBUG() << "QKqueueFileSystemWatcherEngine: processing kevent" << kev.ident << kev.filter; + if (fd == kqpipe[0]) { + // read all pending data from the pipe + QByteArray ba; + ba.resize(kev.data); + if (read(kqpipe[0], ba.data(), ba.size()) != ba.size()) { + perror("QKqueueFileSystemWatcherEngine: error reading from pipe"); + return; + } + // read the command from the buffer (but break and return on 'q') + char cmd = 0; + for (int i = 0; i < ba.size(); ++i) { + cmd = ba.constData()[i]; + if (cmd == 'q') + break; + } + // handle the command + switch (cmd) { + case 'q': + DEBUG() << "QKqueueFileSystemWatcherEngine: thread received 'q', exiting..."; + return; + case '@': + DEBUG() << "QKqueueFileSystemWatcherEngine: thread received '@', continuing..."; + break; + default: + DEBUG() << "QKqueueFileSystemWatcherEngine: thread received unknow message" << cmd; + break; + } + } else { + QMutexLocker locker(&mutex); + + int id = fd; + QString path = idToPath.value(id); + if (path.isEmpty()) { + // perhaps a directory? + id = -id; + path = idToPath.value(id); + if (path.isEmpty()) { + DEBUG() << "QKqueueFileSystemWatcherEngine: received a kevent for a file we're not watching"; + continue; + } + } + if (kev.filter != EVFILT_VNODE) { + DEBUG() << "QKqueueFileSystemWatcherEngine: received a kevent with the wrong filter"; + continue; + } + + if ((kev.fflags & (NOTE_DELETE | NOTE_REVOKE | NOTE_RENAME)) != 0) { + DEBUG() << path << "removed, removing watch also"; + + pathToID.remove(path); + idToPath.remove(id); + ::close(fd); + + if (id < 0) + emit directoryChanged(path, true); + else + emit fileChanged(path, true); + } else { + DEBUG() << path << "changed"; + + if (id < 0) + emit directoryChanged(path, false); + else + emit fileChanged(path, false); + } + } + } + } +} + +#endif //QT_NO_FILESYSTEMWATCHER + +QT_END_NAMESPACE -- cgit v1.2.3