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Fix race condition allowing to run several instances of qBittorrent at the same time

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This commit is contained in:
Christophe Dumez 2010-06-09 09:48:14 +00:00
parent 7ab206ebac
commit b9394f2ba2
24 changed files with 1713 additions and 156 deletions
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4
AUTHORS
View file

@ -11,6 +11,10 @@ Contributors:
* Christian Kandeler <zambesi@users.sourceforge.net>
Code from other projects:
* files src/qtsingleapp/*
copyright: Qt Software (Nokia)
license: LGPL
* files src/ico.cpp src/ico.h
copyright: Malte Starostik <malte@kde.org>
license: LGPL

57
src/GUI.cpp
View file

@ -39,8 +39,6 @@
#include <QDesktopServices>
#include <QStatusBar>
#include <QClipboard>
#include <QLocalServer>
#include <QLocalSocket>
#include <QCloseEvent>
#include <QShortcut>
@ -69,11 +67,6 @@
#include "qmacapplication.h"
#endif
#ifdef Q_WS_WIN
#include <windows.h>
const int UNLEN = 256;
#endif
using namespace libtorrent;
#define TIME_TRAY_BALLOON 5000
@ -133,7 +126,7 @@ GUI::GUI(QWidget *parent, QStringList torrentCmdLine) : QMainWindow(parent), dis
connect(BTSession, SIGNAL(alternativeSpeedsModeChanged(bool)), this, SLOT(updateAltSpeedsBtn(bool)));
connect(BTSession, SIGNAL(recursiveTorrentDownloadPossible(QTorrentHandle&)), this, SLOT(askRecursiveTorrentDownloadConfirmation(QTorrentHandle&)));
#ifdef Q_WS_MAC
connect(static_cast<QMacApplication*>(qApp), SIGNAL(newFileOpenMacEvent(QStringList)), this, SLOT(processParams(QStringList)));
connect(static_cast<QMacApplication*>(qApp), SIGNAL(newFileOpenMacEvent(QString)), this, SLOT(processParams(QString)));
#endif
qDebug("create tabWidget");
@ -177,28 +170,7 @@ GUI::GUI(QWidget *parent, QStringList torrentCmdLine) : QMainWindow(parent), dis
BTSession->startUpTorrents();
// Add torrent given on command line
processParams(torrentCmdLine);
// Use a tcp server to allow only one instance of qBittorrent
localServer = new QLocalServer();
QString uid = "";
#ifdef Q_WS_WIN
char buffer[UNLEN+1] = {0};
DWORD buffer_len = UNLEN + 1;
if (!GetUserNameA(buffer, &buffer_len))
uid = QString(buffer);
#else
uid = QString::number(getuid());
#endif
#ifdef Q_WS_X11
if(QFile::exists(QDir::tempPath()+QDir::separator()+QString("qBittorrent-")+uid)) {
// Socket was not closed cleanly
std::cerr << "Warning: Local domain socket was not closed cleanly, deleting file...\n";
QFile::remove(QDir::tempPath()+QDir::separator()+QString("qBittorrent-")+uid);
}
#endif
if (!localServer->listen("qBittorrent-"+uid)) {
std::cerr << "Couldn't create socket, single instance mode won't work...\n";
}
connect(localServer, SIGNAL(newConnection()), this, SLOT(acceptConnection()));
// Start connection checking timer
guiUpdater = new QTimer(this);
connect(guiUpdater, SIGNAL(timeout()), this, SLOT(updateGUI()));
@ -285,8 +257,6 @@ GUI::~GUI() {
delete systrayIcon;
delete myTrayIconMenu;
}
localServer->close();
delete localServer;
delete tabs;
// Keyboard shortcuts
delete switchSearchShortcut;
@ -447,24 +417,6 @@ void GUI::balloonClicked() {
}
}
void GUI::acceptConnection() {
QLocalSocket *clientConnection = localServer->nextPendingConnection();
connect(clientConnection, SIGNAL(disconnected()), this, SLOT(readParamsOnSocket()));
qDebug("accepted connection from another instance");
}
void GUI::readParamsOnSocket() {
QLocalSocket *clientConnection = static_cast<QLocalSocket*>(sender());
if(clientConnection) {
const QByteArray &params = clientConnection->readAll();
if(!params.isEmpty()) {
processParams(QString::fromLocal8Bit(params.constData()).split("\n"));
qDebug("Received parameters from another instance");
}
clientConnection->deleteLater();
}
}
void GUI::askRecursiveTorrentDownloadConfirmation(QTorrentHandle &h) {
if(QMessageBox::question(this, tr("Recursive download confirmation"), tr("The torrent %1 contains torrent files, do you want to proceed with their download?").arg(h.name()), QMessageBox::Yes|QMessageBox::No) == QMessageBox::Yes) {
BTSession->recursiveTorrentDownload(h);
@ -721,12 +673,15 @@ void GUI::on_actionOpen_triggered() {
// This function parse the parameters and call
// the right addTorrent function, considering
// the parameter type.
void GUI::processParams(const QString& params_str) {
processParams(params_str.split(" ", QString::SkipEmptyParts));
}
void GUI::processParams(const QStringList& params) {
QSettings settings(QString::fromUtf8("qBittorrent"), QString::fromUtf8("qBittorrent"));
const bool useTorrentAdditionDialog = settings.value(QString::fromUtf8("Preferences/Downloads/AdditionDialog"), true).toBool();
foreach(QString param, params) {
param = param.trimmed();
if(param.startsWith("--")) continue;
if(param.startsWith(QString::fromUtf8("http://"), Qt::CaseInsensitive) || param.startsWith(QString::fromUtf8("ftp://"), Qt::CaseInsensitive) || param.startsWith(QString::fromUtf8("https://"), Qt::CaseInsensitive)) {
BTSession->downloadFromUrl(param);
}else{

6
src/GUI.h
View file

@ -43,7 +43,6 @@ class Bittorrent;
class QTimer;
class downloadFromURL;
class SearchEngine;
class QLocalServer;
class QCloseEvent;
class RSSImp;
class QShortcut;
@ -89,8 +88,6 @@ protected slots:
void on_actionWebsite_triggered() const;
void on_actionBugReport_triggered() const;
void on_actionShow_console_triggered();
void readParamsOnSocket();
void acceptConnection();
void balloonClicked();
void writeSettings();
void readSettings();
@ -112,6 +109,7 @@ protected slots:
void on_actionOpen_triggered();
void updateGUI();
void loadPreferences(bool configure_session=true);
void processParams(const QString& params);
void processParams(const QStringList& params);
void addTorrent(QString path);
void addUnauthenticatedTracker(const QPair<QTorrentHandle,QString> &tracker);
@ -165,8 +163,6 @@ private:
SearchEngine *searchEngine;
// RSS
QPointer<RSSImp> rssWidget;
// Misc
QLocalServer *localServer;
};
#endif

43
src/headlessloader.h
View file

@ -33,12 +33,10 @@
#include <QObject>
#include <QCoreApplication>
#include <QLocalServer>
#include <QLocalSocket>
#include "preferences.h"
#include "bittorrent.h"
class HeadlessLoader: QObject {
class HeadlessLoader: public QObject {
Q_OBJECT
public:
@ -52,20 +50,6 @@ public:
BTSession->startUpTorrents();
// Process command line parameters
processParams(torrentCmdLine);
// Use a tcp server to allow only one instance of qBittorrent
localServer = new QLocalServer();
const QString &uid = QString::number(getuid());
#ifdef Q_WS_X11
if(QFile::exists(QDir::tempPath()+QDir::separator()+QString("qBittorrent-")+uid)) {
// Socket was not closed cleanly
std::cerr << "Warning: Local domain socket was not closed cleanly, deleting file..." << std::endl;
QFile::remove(QDir::tempPath()+QDir::separator()+QString("qBittorrent-")+uid);
}
#endif
if (!localServer->listen("qBittorrent-"+uid)) {
std::cerr << "Couldn't create socket, single instance mode won't work..." << std::endl;
}
connect(localServer, SIGNAL(newConnection()), this, SLOT(acceptConnection()));
// Display some information to the user
std::cout << std::endl << "******** " << qPrintable(tr("Information")) << " ********" << std::endl;
std::cout << qPrintable(tr("To control qBittorrent, access the Web UI at http://localhost:%1").arg(QString::number(Preferences::getWebUiPort()))) << std::endl;
@ -77,7 +61,6 @@ public:
}
~HeadlessLoader() {
delete localServer;
delete BTSession;
}
@ -92,6 +75,10 @@ public slots:
std::cout << qPrintable(msg) << std::endl;
}
void processParams(const QString& params_str) {
processParams(params_str.split(" ", QString::SkipEmptyParts));
}
// As program parameters, we can get paths or urls.
// This function parse the parameters and call
// the right addTorrent function, considering
@ -99,7 +86,6 @@ public slots:
void processParams(const QStringList& params) {
foreach(QString param, params) {
param = param.trimmed();
if(param.startsWith("--")) continue;
if(param.startsWith(QString::fromUtf8("http://"), Qt::CaseInsensitive) || param.startsWith(QString::fromUtf8("ftp://"), Qt::CaseInsensitive) || param.startsWith(QString::fromUtf8("https://"), Qt::CaseInsensitive)) {
BTSession->downloadFromUrl(param);
}else{
@ -112,26 +98,7 @@ public slots:
}
}
void acceptConnection() {
QLocalSocket *clientConnection = localServer->nextPendingConnection();
connect(clientConnection, SIGNAL(disconnected()), this, SLOT(readParamsOnSocket()));
qDebug("accepted connection from another instance");
}
void readParamsOnSocket() {
QLocalSocket *clientConnection = static_cast<QLocalSocket*>(sender());
if(clientConnection) {
const QByteArray &params = clientConnection->readAll();
if(!params.isEmpty()) {
processParams(QString(params).split("\n"));
qDebug("Received parameters from another instance");
}
clientConnection->deleteLater();
}
}
private:
QLocalServer *localServer;
Bittorrent *BTSession;
};

85
src/main.cpp
View file

@ -33,7 +33,6 @@
#include <QFile>
#ifndef DISABLE_GUI
#include <QApplication>
#include <QMessageBox>
#include <QStyleFactory>
#include <QStyle>
@ -41,19 +40,19 @@
#include <QPushButton>
#ifdef Q_WS_MAC
#include "qmacapplication.h"
#else
#include "qtsingleapplication.h"
#endif
#include "GUI.h"
#include "ico.h"
#else
#include <QCoreApplication>
#include "qtsinglecoreapplication.h"
#include <iostream>
#include <stdio.h>
#include "headlessloader.h"
#endif
#include <QSettings>
#include <QLocalSocket>
#include <sys/types.h>
#if defined(Q_WS_X11) || defined(Q_WS_MAC)
#include <signal.h>
@ -61,20 +60,15 @@
#include "stacktrace.h"
#endif
#ifdef Q_WS_WIN
#include <windows.h>
const int UNLEN = 256;
#endif
#include <stdlib.h>
#include "misc.h"
#include "preferences.h"
#ifdef DISABLE_GUI
QCoreApplication *app;
QtSingleCoreApplication *app;
#else
#ifndef Q_WS_MAC
QApplication *app;
QtSingleApplication *app;
#else
QMacApplication *app;
#endif
@ -177,60 +171,42 @@ void useStyle(QApplication *app, QString style){
// Main
int main(int argc, char *argv[]){
// Create Application
QString uid = misc::getUserIDString();
#ifdef DISABLE_GUI
app = new QCoreApplication(argc, argv);
app = new QtSingleCoreApplication("qBittorrent-"+uid, argc, argv);
#else
#ifndef Q_WS_MAC
app = new QApplication(argc, argv);
app = new QtSingleApplication("qBittorrent-"+uid, argc, argv);
#else
app = new QMacApplication(argc, argv);
app = new QMacApplication("qBittorrent-"+uid, argc, argv);
#endif
#endif
// Check if qBittorrent is already running for this user
if(app->isRunning()) {
qDebug("qBittorrent is already running for this user.");
//Pass program parameters if any
QString message;
for (int a = 1; a < argc; ++a) {
QString p = QString::fromLocal8Bit(argv[a]);
if(p.startsWith("--")) continue;
message += argv[a];
if (a < argc-1)
message += " ";
}
if(!message.isEmpty()) {
qDebug("Passing program parameters to running instance...");
app->sendMessage(message);
}
return 0;
}
QString locale;
QSettings settings(QString::fromUtf8("qBittorrent"), QString::fromUtf8("qBittorrent"));
#ifndef DISABLE_GUI
bool no_splash = false;
#endif
//Check if there is another instance running
QLocalSocket localSocket;
QString uid;
#ifdef Q_WS_WIN
char buffer[UNLEN+1] = {0};
DWORD buffer_len = UNLEN + 1;
if (!GetUserNameA(buffer, &buffer_len))
uid = QString(buffer);
#else
uid = QString::number(getuid());
#endif
localSocket.connectToServer("qBittorrent-"+uid, QIODevice::WriteOnly);
if (localSocket.waitForConnected(1000)){
std::cout << "Another qBittorrent instance is already running...\n";
// Send parameters
if(argc > 1){
QStringList params;
for(int i=1;i<argc;++i){
params << QString::fromLocal8Bit(argv[i]);
std::cout << argv[i] << '\n';
}
QByteArray block = params.join("\n").toLocal8Bit();
std::cout << "writting: " << block.data() << '\n';
std::cout << "size: " << block.size() << '\n';
uint val = localSocket.write(block);
if(localSocket.waitForBytesWritten(5000)){
std::cout << "written(" <<val<<"): " << block.data() << '\n';
}else{
std::cerr << "Writing to the socket timed out\n";
}
localSocket.disconnectFromServer();
std::cout << "disconnected\n";
}
localSocket.close();
delete app;
return 0;
}
// Load translation
locale = settings.value(QString::fromUtf8("Preferences/General/Locale"), QString()).toString();
QTranslator translator;
@ -339,9 +315,14 @@ int main(int argc, char *argv[]){
splash->finish(window);
delete splash;
}
QObject::connect(app, SIGNAL(messageReceived(const QString&)),
window, SLOT(processParams(const QString&)));
app->setActivationWindow(window);
#else
// Load Headless class
HeadlessLoader *loader = new HeadlessLoader(torrentCmdLine);
QObject::connect(app, SIGNAL(messageReceived(const QString&)),
loader, SLOT(processParams(const QString&)));
#endif
int ret = app->exec();

18
src/misc.cpp
View file

@ -45,6 +45,11 @@
#ifdef Q_WS_WIN
#include <shlobj.h>
#include <windows.h>
const int UNLEN = 256;
#else
#include <unistd.h>
#include <sys/types.h>
#endif
#ifdef Q_WS_MAC
@ -545,6 +550,19 @@ QString misc::userFriendlyDuration(qlonglong seconds) {
return QString::fromUtf8("∞");
}
QString misc::getUserIDString() {
QString uid = "0";
#ifdef Q_WS_WIN
char buffer[UNLEN+1] = {0};
DWORD buffer_len = UNLEN + 1;
if (!GetUserNameA(buffer, &buffer_len))
uid = QString(buffer);
#else
uid = QString::number(getuid());
#endif
return uid;
}
QStringList misc::toStringList(const QList<bool> &l) {
QStringList ret;
foreach(const bool &b, l) {

1
src/misc.h
View file

@ -122,6 +122,7 @@ public:
// Take a number of seconds and return an user-friendly
// time duration like "1d 2h 10m".
static QString userFriendlyDuration(qlonglong seconds);
static QString getUserIDString();
// Convert functions
static QStringList toStringList(const QList<bool> &l);

9
src/qmacapplication.cpp
View file

@ -33,8 +33,8 @@
#include <QFileOpenEvent>
#include "qmacapplication.h"
QMacApplication::QMacApplication(int &argc, char** argv) :
QApplication(argc, argv)
QMacApplication::QMacApplication(QString appid, int &argc, char** argv) :
QtSingleApplication(appid, argc, argv)
{
}
@ -43,9 +43,8 @@ bool QMacApplication::event(QEvent * event) {
switch (event->type()) {
case QEvent::FileOpen:
{
QStringList paths;
paths << static_cast<QFileOpenEvent *>(event)->file();
emit newFileOpenMacEvent(paths);
QString path = static_cast<QFileOpenEvent *>(event)->file();
emit newFileOpenMacEvent(path);
return true;
}
default:

8
src/qmacapplication.h
View file

@ -32,17 +32,17 @@
#ifdef Q_WS_MAC
#include <QApplication>
#include "qtsingleapplication.h"
#include <QStringList>
class QMacApplication : public QApplication
class QMacApplication : public QtSingleApplication
{
Q_OBJECT
public:
explicit QMacApplication(int &argc, char** argv);
explicit QMacApplication(QString appid, int &argc, char** argv);
signals:
void newFileOpenMacEvent(QStringList paths);
void newFileOpenMacEvent(const QString &path);
protected:
bool event(QEvent *);

1
src/qtsingleapp/QtLockedFile Normal file
View file

@ -0,0 +1 @@
#include "qtlockedfile.h"

1
src/qtsingleapp/QtSingleApplication Normal file
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@ -0,0 +1 @@
#include "qtsingleapplication.h"

203
src/qtsingleapp/qtlocalpeer.cpp Normal file
View file

@ -0,0 +1,203 @@
/****************************************************************************
**
** Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of a Qt Solutions component.
**
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Solutions Commercial License Agreement provided
** with the Software or, alternatively, in accordance with the terms
** contained in a written agreement between you and Nokia.
**
** 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.
**
** 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.
**
** Please note Third Party Software included with Qt Solutions may impose
** additional restrictions and it is the user's responsibility to ensure
** that they have met the licensing requirements of the GPL, LGPL, or Qt
** Solutions Commercial license and the relevant license of the Third
** Party Software they are using.
**
** If you are unsure which license is appropriate for your use, please
** contact Nokia at qt-info@nokia.com.
**
****************************************************************************/
#include "qtlocalpeer.h"
#include <QtCore/QCoreApplication>
#include <QtCore/QTime>
#if defined(Q_OS_WIN)
#include <QtCore/QLibrary>
#include <QtCore/qt_windows.h>
typedef BOOL(WINAPI*PProcessIdToSessionId)(DWORD,DWORD*);
static PProcessIdToSessionId pProcessIdToSessionId = 0;
#endif
#if defined(Q_OS_UNIX)
#include <time.h>
#endif
namespace QtLP_Private {
#include "qtlockedfile.cpp"
#if defined(Q_OS_WIN)
#include "qtlockedfile_win.cpp"
#else
#include "qtlockedfile_unix.cpp"
#endif
}
const char* QtLocalPeer::ack = "ack";
QtLocalPeer::QtLocalPeer(QObject* parent, const QString &appId)
: QObject(parent), id(appId)
{
QString prefix = id;
if (id.isEmpty()) {
id = QCoreApplication::applicationFilePath();
#if defined(Q_OS_WIN)
id = id.toLower();
#endif
prefix = id.section(QLatin1Char('/'), -1);
}
prefix.remove(QRegExp("[^a-zA-Z]"));
prefix.truncate(6);
QByteArray idc = id.toUtf8();
quint16 idNum = qChecksum(idc.constData(), idc.size());
socketName = QLatin1String("qtsingleapp-") + prefix
+ QLatin1Char('-') + QString::number(idNum, 16);
#if defined(Q_OS_WIN)
if (!pProcessIdToSessionId) {
QLibrary lib("kernel32");
pProcessIdToSessionId = (PProcessIdToSessionId)lib.resolve("ProcessIdToSessionId");
}
if (pProcessIdToSessionId) {
DWORD sessionId = 0;
pProcessIdToSessionId(GetCurrentProcessId(), &sessionId);
socketName += QLatin1Char('-') + QString::number(sessionId, 16);
}
#else
socketName += QLatin1Char('-') + QString::number(::getuid(), 16);
#endif
server = new QLocalServer(this);
QString lockName = QDir(QDir::tempPath()).absolutePath()
+ QLatin1Char('/') + socketName
+ QLatin1String("-lockfile");
lockFile.setFileName(lockName);
lockFile.open(QIODevice::ReadWrite);
}
bool QtLocalPeer::isClient()
{
if (lockFile.isLocked())
return false;
if (!lockFile.lock(QtLP_Private::QtLockedFile::WriteLock, false))
return true;
bool res = server->listen(socketName);
#if defined(Q_OS_UNIX) && (QT_VERSION >= QT_VERSION_CHECK(4,5,0))
// ### Workaround
if (!res && server->serverError() == QAbstractSocket::AddressInUseError) {
QFile::remove(QDir::cleanPath(QDir::tempPath())+QLatin1Char('/')+socketName);
res = server->listen(socketName);
}
#endif
if (!res)
qWarning("QtSingleCoreApplication: listen on local socket failed, %s", qPrintable(server->errorString()));
QObject::connect(server, SIGNAL(newConnection()), SLOT(receiveConnection()));
return false;
}
bool QtLocalPeer::sendMessage(const QString &message, int timeout)
{
if (!isClient())
return false;
QLocalSocket socket;
bool connOk = false;
for(int i = 0; i < 2; i++) {
// Try twice, in case the other instance is just starting up
socket.connectToServer(socketName);
connOk = socket.waitForConnected(timeout/2);
if (connOk || i)
break;
int ms = 250;
#if defined(Q_OS_WIN)
Sleep(DWORD(ms));
#else
struct timespec ts = { ms / 1000, (ms % 1000) * 1000 * 1000 };
nanosleep(&ts, NULL);
#endif
}
if (!connOk)
return false;
QByteArray uMsg(message.toUtf8());
QDataStream ds(&socket);
ds.writeBytes(uMsg.constData(), uMsg.size());
bool res = socket.waitForBytesWritten(timeout);
res &= socket.waitForReadyRead(timeout); // wait for ack
res &= (socket.read(qstrlen(ack)) == ack);
return res;
}
void QtLocalPeer::receiveConnection()
{
QLocalSocket* socket = server->nextPendingConnection();
if (!socket)
return;
while (socket->bytesAvailable() < (int)sizeof(quint32))
socket->waitForReadyRead();
QDataStream ds(socket);
QByteArray uMsg;
quint32 remaining;
ds >> remaining;
uMsg.resize(remaining);
int got = 0;
char* uMsgBuf = uMsg.data();
do {
got = ds.readRawData(uMsgBuf, remaining);
remaining -= got;
uMsgBuf += got;
} while (remaining && got >= 0 && socket->waitForReadyRead(2000));
if (got < 0) {
qWarning() << "QtLocalPeer: Message reception failed" << socket->errorString();
delete socket;
return;
}
QString message(QString::fromUtf8(uMsg));
socket->write(ack, qstrlen(ack));
socket->waitForBytesWritten(1000);
delete socket;
emit messageReceived(message); //### (might take a long time to return)
}

81
src/qtsingleapp/qtlocalpeer.h Normal file
View file

@ -0,0 +1,81 @@
/****************************************************************************
**
** Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of a Qt Solutions component.
**
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Solutions Commercial License Agreement provided
** with the Software or, alternatively, in accordance with the terms
** contained in a written agreement between you and Nokia.
**
** 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.
**
** 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.
**
** Please note Third Party Software included with Qt Solutions may impose
** additional restrictions and it is the user's responsibility to ensure
** that they have met the licensing requirements of the GPL, LGPL, or Qt
** Solutions Commercial license and the relevant license of the Third
** Party Software they are using.
**
** If you are unsure which license is appropriate for your use, please
** contact Nokia at qt-info@nokia.com.
**
****************************************************************************/
#include <QtNetwork/QLocalServer>
#include <QtNetwork/QLocalSocket>
#include <QtCore/QDir>
namespace QtLP_Private {
#include "qtlockedfile.h"
}
class QtLocalPeer : public QObject
{
Q_OBJECT
public:
QtLocalPeer(QObject *parent = 0, const QString &appId = QString());
bool isClient();
bool sendMessage(const QString &message, int timeout);
QString applicationId() const
{ return id; }
Q_SIGNALS:
void messageReceived(const QString &message);
protected Q_SLOTS:
void receiveConnection();
protected:
QString id;
QString socketName;
QLocalServer* server;
QtLP_Private::QtLockedFile lockFile;
private:
static const char* ack;
};

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/****************************************************************************
**
** Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of a Qt Solutions component.
**
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Solutions Commercial License Agreement provided
** with the Software or, alternatively, in accordance with the terms
** contained in a written agreement between you and Nokia.
**
** 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.
**
** 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.
**
** Please note Third Party Software included with Qt Solutions may impose
** additional restrictions and it is the user's responsibility to ensure
** that they have met the licensing requirements of the GPL, LGPL, or Qt
** Solutions Commercial license and the relevant license of the Third
** Party Software they are using.
**
** If you are unsure which license is appropriate for your use, please
** contact Nokia at qt-info@nokia.com.
**
****************************************************************************/
#include "qtlockedfile.h"
/*!
\class QtLockedFile
\brief The QtLockedFile class extends QFile with advisory locking
functions.
A file may be locked in read or write mode. Multiple instances of
\e QtLockedFile, created in multiple processes running on the same
machine, may have a file locked in read mode. Exactly one instance
may have it locked in write mode. A read and a write lock cannot
exist simultaneously on the same file.
The file locks are advisory. This means that nothing prevents
another process from manipulating a locked file using QFile or
file system functions offered by the OS. Serialization is only
guaranteed if all processes that access the file use
QLockedFile. Also, while holding a lock on a file, a process
must not open the same file again (through any API), or locks
can be unexpectedly lost.
The lock provided by an instance of \e QtLockedFile is released
whenever the program terminates. This is true even when the
program crashes and no destructors are called.
*/
/*! \enum QtLockedFile::LockMode
This enum describes the available lock modes.
\value ReadLock A read lock.
\value WriteLock A write lock.
\value NoLock Neither a read lock nor a write lock.
*/
/*!
Constructs an unlocked \e QtLockedFile object. This constructor
behaves in the same way as \e QFile::QFile().
\sa QFile::QFile()
*/
QtLockedFile::QtLockedFile()
: QFile()
{
#ifdef Q_OS_WIN
wmutex = 0;
rmutex = 0;
#endif
m_lock_mode = NoLock;
}
/*!
Constructs an unlocked QtLockedFile object with file \a name. This
constructor behaves in the same way as \e QFile::QFile(const
QString&).
\sa QFile::QFile()
*/
QtLockedFile::QtLockedFile(const QString &name)
: QFile(name)
{
#ifdef Q_OS_WIN
wmutex = 0;
rmutex = 0;
#endif
m_lock_mode = NoLock;
}
/*!
Opens the file in OpenMode \a mode.
This is identical to QFile::open(), with the one exception that the
Truncate mode flag is disallowed. Truncation would conflict with the
advisory file locking, since the file would be modified before the
write lock is obtained. If truncation is required, use resize(0)
after obtaining the write lock.
Returns true if successful; otherwise false.
\sa QFile::open(), QFile::resize()
*/
bool QtLockedFile::open(OpenMode mode)
{
if (mode & QIODevice::Truncate) {
qWarning("QtLockedFile::open(): Truncate mode not allowed.");
return false;
}
return QFile::open(mode);
}
/*!
Returns \e true if this object has a in read or write lock;
otherwise returns \e false.
\sa lockMode()
*/
bool QtLockedFile::isLocked() const
{
return m_lock_mode != NoLock;
}
/*!
Returns the type of lock currently held by this object, or \e
QtLockedFile::NoLock.
\sa isLocked()
*/
QtLockedFile::LockMode QtLockedFile::lockMode() const
{
return m_lock_mode;
}
/*!
\fn bool QtLockedFile::lock(LockMode mode, bool block = true)
Obtains a lock of type \a mode. The file must be opened before it
can be locked.
If \a block is true, this function will block until the lock is
aquired. If \a block is false, this function returns \e false
immediately if the lock cannot be aquired.
If this object already has a lock of type \a mode, this function
returns \e true immediately. If this object has a lock of a
different type than \a mode, the lock is first released and then a
new lock is obtained.
This function returns \e true if, after it executes, the file is
locked by this object, and \e false otherwise.
\sa unlock(), isLocked(), lockMode()
*/
/*!
\fn bool QtLockedFile::unlock()
Releases a lock.
If the object has no lock, this function returns immediately.
This function returns \e true if, after it executes, the file is
not locked by this object, and \e false otherwise.
\sa lock(), isLocked(), lockMode()
*/
/*!
\fn QtLockedFile::~QtLockedFile()
Destroys the \e QtLockedFile object. If any locks were held, they
are released.
*/

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/****************************************************************************
**
** Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of a Qt Solutions component.
**
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Solutions Commercial License Agreement provided
** with the Software or, alternatively, in accordance with the terms
** contained in a written agreement between you and Nokia.
**
** 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.
**
** 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.
**
** Please note Third Party Software included with Qt Solutions may impose
** additional restrictions and it is the user's responsibility to ensure
** that they have met the licensing requirements of the GPL, LGPL, or Qt
** Solutions Commercial license and the relevant license of the Third
** Party Software they are using.
**
** If you are unsure which license is appropriate for your use, please
** contact Nokia at qt-info@nokia.com.
**
****************************************************************************/
#ifndef QTLOCKEDFILE_H
#define QTLOCKEDFILE_H
#include <QtCore/QFile>
#ifdef Q_OS_WIN
#include <QtCore/QVector>
#endif
#if defined(Q_WS_WIN)
# if !defined(QT_QTLOCKEDFILE_EXPORT) && !defined(QT_QTLOCKEDFILE_IMPORT)
# define QT_QTLOCKEDFILE_EXPORT
# elif defined(QT_QTLOCKEDFILE_IMPORT)
# if defined(QT_QTLOCKEDFILE_EXPORT)
# undef QT_QTLOCKEDFILE_EXPORT
# endif
# define QT_QTLOCKEDFILE_EXPORT __declspec(dllimport)
# elif defined(QT_QTLOCKEDFILE_EXPORT)
# undef QT_QTLOCKEDFILE_EXPORT
# define QT_QTLOCKEDFILE_EXPORT __declspec(dllexport)
# endif
#else
# define QT_QTLOCKEDFILE_EXPORT
#endif
class QT_QTLOCKEDFILE_EXPORT QtLockedFile : public QFile
{
public:
enum LockMode { NoLock = 0, ReadLock, WriteLock };
QtLockedFile();
QtLockedFile(const QString &name);
~QtLockedFile();
bool open(OpenMode mode);
bool lock(LockMode mode, bool block = true);
bool unlock();
bool isLocked() const;
LockMode lockMode() const;
private:
#ifdef Q_OS_WIN
Qt::HANDLE wmutex;
Qt::HANDLE rmutex;
QVector<Qt::HANDLE> rmutexes;
QString mutexname;
Qt::HANDLE getMutexHandle(int idx, bool doCreate);
bool waitMutex(Qt::HANDLE mutex, bool doBlock);
#endif
LockMode m_lock_mode;
};
#endif

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/****************************************************************************
**
** Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of a Qt Solutions component.
**
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Solutions Commercial License Agreement provided
** with the Software or, alternatively, in accordance with the terms
** contained in a written agreement between you and Nokia.
**
** 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.
**
** 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.
**
** Please note Third Party Software included with Qt Solutions may impose
** additional restrictions and it is the user's responsibility to ensure
** that they have met the licensing requirements of the GPL, LGPL, or Qt
** Solutions Commercial license and the relevant license of the Third
** Party Software they are using.
**
** If you are unsure which license is appropriate for your use, please
** contact Nokia at qt-info@nokia.com.
**
****************************************************************************/
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include "qtlockedfile.h"
bool QtLockedFile::lock(LockMode mode, bool block)
{
if (!isOpen()) {
qWarning("QtLockedFile::lock(): file is not opened");
return false;
}
if (mode == NoLock)
return unlock();
if (mode == m_lock_mode)
return true;
if (m_lock_mode != NoLock)
unlock();
struct flock fl;
fl.l_whence = SEEK_SET;
fl.l_start = 0;
fl.l_len = 0;
fl.l_type = (mode == ReadLock) ? F_RDLCK : F_WRLCK;
int cmd = block ? F_SETLKW : F_SETLK;
int ret = fcntl(handle(), cmd, &fl);
if (ret == -1) {
if (errno != EINTR && errno != EAGAIN)
qWarning("QtLockedFile::lock(): fcntl: %s", strerror(errno));
return false;
}
m_lock_mode = mode;
return true;
}
bool QtLockedFile::unlock()
{
if (!isOpen()) {
qWarning("QtLockedFile::unlock(): file is not opened");
return false;
}
if (!isLocked())
return true;
struct flock fl;
fl.l_whence = SEEK_SET;
fl.l_start = 0;
fl.l_len = 0;
fl.l_type = F_UNLCK;
int ret = fcntl(handle(), F_SETLKW, &fl);
if (ret == -1) {
qWarning("QtLockedFile::lock(): fcntl: %s", strerror(errno));
return false;
}
m_lock_mode = NoLock;
return true;
}
QtLockedFile::~QtLockedFile()
{
if (isOpen())
unlock();
}

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/****************************************************************************
**
** Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of a Qt Solutions component.
**
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Solutions Commercial License Agreement provided
** with the Software or, alternatively, in accordance with the terms
** contained in a written agreement between you and Nokia.
**
** 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.
**
** 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.
**
** Please note Third Party Software included with Qt Solutions may impose
** additional restrictions and it is the user's responsibility to ensure
** that they have met the licensing requirements of the GPL, LGPL, or Qt
** Solutions Commercial license and the relevant license of the Third
** Party Software they are using.
**
** If you are unsure which license is appropriate for your use, please
** contact Nokia at qt-info@nokia.com.
**
****************************************************************************/
#include "qtlockedfile.h"
#include <qt_windows.h>
#include <QtCore/QFileInfo>
#define MUTEX_PREFIX "QtLockedFile mutex "
// Maximum number of concurrent read locks. Must not be greater than MAXIMUM_WAIT_OBJECTS
#define MAX_READERS MAXIMUM_WAIT_OBJECTS
Qt::HANDLE QtLockedFile::getMutexHandle(int idx, bool doCreate)
{
if (mutexname.isEmpty()) {
QFileInfo fi(*this);
mutexname = QString::fromLatin1(MUTEX_PREFIX)
+ fi.absoluteFilePath().toLower();
}
QString mname(mutexname);
if (idx >= 0)
mname += QString::number(idx);
Qt::HANDLE mutex;
if (doCreate) {
QT_WA( { mutex = CreateMutexW(NULL, FALSE, (TCHAR*)mname.utf16()); },
{ mutex = CreateMutexA(NULL, FALSE, mname.toLocal8Bit().constData()); } );
if (!mutex) {
qErrnoWarning("QtLockedFile::lock(): CreateMutex failed");
return 0;
}
}
else {
QT_WA( { mutex = OpenMutexW(SYNCHRONIZE | MUTEX_MODIFY_STATE, FALSE, (TCHAR*)mname.utf16()); },
{ mutex = OpenMutexA(SYNCHRONIZE | MUTEX_MODIFY_STATE, FALSE, mname.toLocal8Bit().constData()); } );
if (!mutex) {
if (GetLastError() != ERROR_FILE_NOT_FOUND)
qErrnoWarning("QtLockedFile::lock(): OpenMutex failed");
return 0;
}
}
return mutex;
}
bool QtLockedFile::waitMutex(Qt::HANDLE mutex, bool doBlock)
{
Q_ASSERT(mutex);
DWORD res = WaitForSingleObject(mutex, doBlock ? INFINITE : 0);
switch (res) {
case WAIT_OBJECT_0:
case WAIT_ABANDONED:
return true;
break;
case WAIT_TIMEOUT:
break;
default:
qErrnoWarning("QtLockedFile::lock(): WaitForSingleObject failed");
}
return false;
}
bool QtLockedFile::lock(LockMode mode, bool block)
{
if (!isOpen()) {
qWarning("QtLockedFile::lock(): file is not opened");
return false;
}
if (mode == NoLock)
return unlock();
if (mode == m_lock_mode)
return true;
if (m_lock_mode != NoLock)
unlock();
if (!wmutex && !(wmutex = getMutexHandle(-1, true)))
return false;
if (!waitMutex(wmutex, block))
return false;
if (mode == ReadLock) {
int idx = 0;
for (; idx < MAX_READERS; idx++) {
rmutex = getMutexHandle(idx, false);
if (!rmutex || waitMutex(rmutex, false))
break;
CloseHandle(rmutex);
}
bool ok = true;
if (idx >= MAX_READERS) {
qWarning("QtLockedFile::lock(): too many readers");
rmutex = 0;
ok = false;
}
else if (!rmutex) {
rmutex = getMutexHandle(idx, true);
if (!rmutex || !waitMutex(rmutex, false))
ok = false;
}
if (!ok && rmutex) {
CloseHandle(rmutex);
rmutex = 0;
}
ReleaseMutex(wmutex);
if (!ok)
return false;
}
else {
Q_ASSERT(rmutexes.isEmpty());
for (int i = 0; i < MAX_READERS; i++) {
Qt::HANDLE mutex = getMutexHandle(i, false);
if (mutex)
rmutexes.append(mutex);
}
if (rmutexes.size()) {
DWORD res = WaitForMultipleObjects(rmutexes.size(), rmutexes.constData(),
TRUE, block ? INFINITE : 0);
if (res != WAIT_OBJECT_0 && res != WAIT_ABANDONED) {
if (res != WAIT_TIMEOUT)
qErrnoWarning("QtLockedFile::lock(): WaitForMultipleObjects failed");
m_lock_mode = WriteLock; // trick unlock() to clean up - semiyucky
unlock();
return false;
}
}
}
m_lock_mode = mode;
return true;
}
bool QtLockedFile::unlock()
{
if (!isOpen()) {
qWarning("QtLockedFile::unlock(): file is not opened");
return false;
}
if (!isLocked())
return true;
if (m_lock_mode == ReadLock) {
ReleaseMutex(rmutex);
CloseHandle(rmutex);
rmutex = 0;
}
else {
foreach(Qt::HANDLE mutex, rmutexes) {
ReleaseMutex(mutex);
CloseHandle(mutex);
}
rmutexes.clear();
ReleaseMutex(wmutex);
}
m_lock_mode = QtLockedFile::NoLock;
return true;
}
QtLockedFile::~QtLockedFile()
{
if (isOpen())
unlock();
if (wmutex)
CloseHandle(wmutex);
}

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/****************************************************************************
**
** Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of a Qt Solutions component.
**
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Solutions Commercial License Agreement provided
** with the Software or, alternatively, in accordance with the terms
** contained in a written agreement between you and Nokia.
**
** 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.
**
** 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.
**
** Please note Third Party Software included with Qt Solutions may impose
** additional restrictions and it is the user's responsibility to ensure
** that they have met the licensing requirements of the GPL, LGPL, or Qt
** Solutions Commercial license and the relevant license of the Third
** Party Software they are using.
**
** If you are unsure which license is appropriate for your use, please
** contact Nokia at qt-info@nokia.com.
**
****************************************************************************/
#include "qtsingleapplication.h"
#include "qtlocalpeer.h"
#include <QtGui/QWidget>
/*!
\class QtSingleApplication qtsingleapplication.h
\brief The QtSingleApplication class provides an API to detect and
communicate with running instances of an application.
This class allows you to create applications where only one
instance should be running at a time. I.e., if the user tries to
launch another instance, the already running instance will be
activated instead. Another usecase is a client-server system,
where the first started instance will assume the role of server,
and the later instances will act as clients of that server.
By default, the full path of the executable file is used to
determine whether two processes are instances of the same
application. You can also provide an explicit identifier string
that will be compared instead.
The application should create the QtSingleApplication object early
in the startup phase, and call isRunning() or sendMessage() to
find out if another instance of this application is already
running. Startup parameters (e.g. the name of the file the user
wanted this new instance to open) can be passed to the running
instance in the sendMessage() function.
If isRunning() or sendMessage() returns false, it means that no
other instance is running, and this instance has assumed the role
as the running instance. The application should continue with the
initialization of the application user interface before entering
the event loop with exec(), as normal. The messageReceived()
signal will be emitted when the application receives messages from
another instance of the same application.
If isRunning() or sendMessage() returns true, another instance is
already running, and the application should terminate or enter
client mode.
If a message is received it might be helpful to the user to raise
the application so that it becomes visible. To facilitate this,
QtSingleApplication provides the setActivationWindow() function
and the activateWindow() slot.
Here's an example that shows how to convert an existing
application to use QtSingleApplication. It is very simple and does
not make use of all QtSingleApplication's functionality (see the
examples for that).
\code
// Original
int main(int argc, char **argv)
{
QApplication app(argc, argv);
MyMainWidget mmw;
mmw.show();
return app.exec();
}
// Single instance
int main(int argc, char **argv)
{
QtSingleApplication app(argc, argv);
if (app.isRunning())
return 0;
MyMainWidget mmw;
app.setActivationWindow(&mmw);
mmw.show();
return app.exec();
}
\endcode
Once this QtSingleApplication instance is destroyed(for example,
when the user quits), when the user next attempts to run the
application this instance will not, of course, be encountered. The
next instance to call isRunning() or sendMessage() will assume the
role as the new running instance.
For console (non-GUI) applications, QtSingleCoreApplication may be
used instead of this class, to avoid the dependency on the QtGui
library.
\sa QtSingleCoreApplication
*/
void QtSingleApplication::sysInit(const QString &appId)
{
actWin = 0;
peer = new QtLocalPeer(this, appId);
connect(peer, SIGNAL(messageReceived(const QString&)), SIGNAL(messageReceived(const QString&)));
}
/*!
Creates a QtSingleApplication object. The application identifier
will be QCoreApplication::applicationFilePath(). \a argc, \a
argv, and \a GUIenabled are passed on to the QAppliation constructor.
If you are creating a console application (i.e. setting \a
GUIenabled to false), you may consider using
QtSingleCoreApplication instead.
*/
QtSingleApplication::QtSingleApplication(int &argc, char **argv, bool GUIenabled)
: QApplication(argc, argv, GUIenabled)
{
sysInit();
}
/*!
Creates a QtSingleApplication object with the application
identifier \a appId. \a argc and \a argv are passed on to the
QAppliation constructor.
*/
QtSingleApplication::QtSingleApplication(const QString &appId, int &argc, char **argv)
: QApplication(argc, argv)
{
sysInit(appId);
}
/*!
Creates a QtSingleApplication object. The application identifier
will be QCoreApplication::applicationFilePath(). \a argc, \a
argv, and \a type are passed on to the QAppliation constructor.
*/
QtSingleApplication::QtSingleApplication(int &argc, char **argv, Type type)
: QApplication(argc, argv, type)
{
sysInit();
}
#if defined(Q_WS_X11)
/*!
Special constructor for X11, ref. the documentation of
QApplication's corresponding constructor. The application identifier
will be QCoreApplication::applicationFilePath(). \a dpy, \a visual,
and \a cmap are passed on to the QApplication constructor.
*/
QtSingleApplication::QtSingleApplication(Display* dpy, Qt::HANDLE visual, Qt::HANDLE cmap)
: QApplication(dpy, visual, cmap)
{
sysInit();
}
/*!
Special constructor for X11, ref. the documentation of
QApplication's corresponding constructor. The application identifier
will be QCoreApplication::applicationFilePath(). \a dpy, \a argc, \a
argv, \a visual, and \a cmap are passed on to the QApplication
constructor.
*/
QtSingleApplication::QtSingleApplication(Display *dpy, int &argc, char **argv, Qt::HANDLE visual, Qt::HANDLE cmap)
: QApplication(dpy, argc, argv, visual, cmap)
{
sysInit();
}
/*!
Special constructor for X11, ref. the documentation of
QApplication's corresponding constructor. The application identifier
will be \a appId. \a dpy, \a argc, \a
argv, \a visual, and \a cmap are passed on to the QApplication
constructor.
*/
QtSingleApplication::QtSingleApplication(Display* dpy, const QString &appId, int argc, char **argv, Qt::HANDLE visual, Qt::HANDLE cmap)
: QApplication(dpy, argc, argv, visual, cmap)
{
sysInit(appId);
}
#endif
/*!
Returns true if another instance of this application is running;
otherwise false.
This function does not find instances of this application that are
being run by a different user (on Windows: that are running in
another session).
\sa sendMessage()
*/
bool QtSingleApplication::isRunning()
{
return peer->isClient();
}
/*!
Tries to send the text \a message to the currently running
instance. The QtSingleApplication object in the running instance
will emit the messageReceived() signal when it receives the
message.
This function returns true if the message has been sent to, and
processed by, the current instance. If there is no instance
currently running, or if the running instance fails to process the
message within \a timeout milliseconds, this function return false.
\sa isRunning(), messageReceived()
*/
bool QtSingleApplication::sendMessage(const QString &message, int timeout)
{
return peer->sendMessage(message, timeout);
}
/*!
Returns the application identifier. Two processes with the same
identifier will be regarded as instances of the same application.
*/
QString QtSingleApplication::id() const
{
return peer->applicationId();
}
/*!
Sets the activation window of this application to \a aw. The
activation window is the widget that will be activated by
activateWindow(). This is typically the application's main window.
If \a activateOnMessage is true (the default), the window will be
activated automatically every time a message is received, just prior
to the messageReceived() signal being emitted.
\sa activateWindow(), messageReceived()
*/
void QtSingleApplication::setActivationWindow(QWidget* aw, bool activateOnMessage)
{
actWin = aw;
if (activateOnMessage)
connect(peer, SIGNAL(messageReceived(const QString&)), this, SLOT(activateWindow()));
else
disconnect(peer, SIGNAL(messageReceived(const QString&)), this, SLOT(activateWindow()));
}
/*!
Returns the applications activation window if one has been set by
calling setActivationWindow(), otherwise returns 0.
\sa setActivationWindow()
*/
QWidget* QtSingleApplication::activationWindow() const
{
return actWin;
}
/*!
De-minimizes, raises, and activates this application's activation window.
This function does nothing if no activation window has been set.
This is a convenience function to show the user that this
application instance has been activated when he has tried to start
another instance.
This function should typically be called in response to the
messageReceived() signal. By default, that will happen
automatically, if an activation window has been set.
\sa setActivationWindow(), messageReceived(), initialize()
*/
void QtSingleApplication::activateWindow()
{
if (actWin) {
actWin->setWindowState(actWin->windowState() & ~Qt::WindowMinimized);
actWin->raise();
actWin->activateWindow();
}
}
/*!
\fn void QtSingleApplication::messageReceived(const QString& message)
This signal is emitted when the current instance receives a \a
message from another instance of this application.
\sa sendMessage(), setActivationWindow(), activateWindow()
*/
/*!
\fn void QtSingleApplication::initialize(bool dummy = true)
\obsolete
*/

105
src/qtsingleapp/qtsingleapplication.h Normal file
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@ -0,0 +1,105 @@
/****************************************************************************
**
** Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of a Qt Solutions component.
**
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Solutions Commercial License Agreement provided
** with the Software or, alternatively, in accordance with the terms
** contained in a written agreement between you and Nokia.
**
** 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.
**
** 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.
**
** Please note Third Party Software included with Qt Solutions may impose
** additional restrictions and it is the user's responsibility to ensure
** that they have met the licensing requirements of the GPL, LGPL, or Qt
** Solutions Commercial license and the relevant license of the Third
** Party Software they are using.
**
** If you are unsure which license is appropriate for your use, please
** contact Nokia at qt-info@nokia.com.
**
****************************************************************************/
#include <QtGui/QApplication>
class QtLocalPeer;
#if defined(Q_WS_WIN)
# if !defined(QT_QTSINGLEAPPLICATION_EXPORT) && !defined(QT_QTSINGLEAPPLICATION_IMPORT)
# define QT_QTSINGLEAPPLICATION_EXPORT
# elif defined(QT_QTSINGLEAPPLICATION_IMPORT)
# if defined(QT_QTSINGLEAPPLICATION_EXPORT)
# undef QT_QTSINGLEAPPLICATION_EXPORT
# endif
# define QT_QTSINGLEAPPLICATION_EXPORT __declspec(dllimport)
# elif defined(QT_QTSINGLEAPPLICATION_EXPORT)
# undef QT_QTSINGLEAPPLICATION_EXPORT
# define QT_QTSINGLEAPPLICATION_EXPORT __declspec(dllexport)
# endif
#else
# define QT_QTSINGLEAPPLICATION_EXPORT
#endif
class QT_QTSINGLEAPPLICATION_EXPORT QtSingleApplication : public QApplication
{
Q_OBJECT
public:
QtSingleApplication(int &argc, char **argv, bool GUIenabled = true);
QtSingleApplication(const QString &id, int &argc, char **argv);
QtSingleApplication(int &argc, char **argv, Type type);
#if defined(Q_WS_X11)
QtSingleApplication(Display* dpy, Qt::HANDLE visual = 0, Qt::HANDLE colormap = 0);
QtSingleApplication(Display *dpy, int &argc, char **argv, Qt::HANDLE visual = 0, Qt::HANDLE cmap= 0);
QtSingleApplication(Display* dpy, const QString &appId, int argc, char **argv, Qt::HANDLE visual = 0, Qt::HANDLE colormap = 0);
#endif
bool isRunning();
QString id() const;
void setActivationWindow(QWidget* aw, bool activateOnMessage = true);
QWidget* activationWindow() const;
// Obsolete:
void initialize(bool dummy = true)
{ isRunning(); Q_UNUSED(dummy) }
public Q_SLOTS:
bool sendMessage(const QString &message, int timeout = 5000);
void activateWindow();
Q_SIGNALS:
void messageReceived(const QString &message);
private:
void sysInit(const QString &appId = QString());
QtLocalPeer *peer;
QWidget *actWin;
};

16
src/qtsingleapp/qtsingleapplication.pri Normal file
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@ -0,0 +1,16 @@
include(../common.pri)
INCLUDEPATH += $$PWD
DEPENDPATH += $$PWD
QT *= network
qtsingleapplication-uselib:!qtsingleapplication-buildlib {
LIBS += -L$$QTSINGLEAPPLICATION_LIBDIR -l$$QTSINGLEAPPLICATION_LIBNAME
} else {
SOURCES += $$PWD/qtsingleapplication.cpp $$PWD/qtlocalpeer.cpp
HEADERS += $$PWD/qtsingleapplication.h $$PWD/qtlocalpeer.h
}
win32 {
contains(TEMPLATE, lib):contains(CONFIG, shared):DEFINES += QT_QTSINGLEAPPLICATION_EXPORT
else:qtsingleapplication-uselib:DEFINES += QT_QTSINGLEAPPLICATION_IMPORT
}

155
src/qtsingleapp/qtsinglecoreapplication.cpp Normal file
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@ -0,0 +1,155 @@
/****************************************************************************
**
** Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of a Qt Solutions component.
**
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Solutions Commercial License Agreement provided
** with the Software or, alternatively, in accordance with the terms
** contained in a written agreement between you and Nokia.
**
** 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.
**
** 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.
**
** Please note Third Party Software included with Qt Solutions may impose
** additional restrictions and it is the user's responsibility to ensure
** that they have met the licensing requirements of the GPL, LGPL, or Qt
** Solutions Commercial license and the relevant license of the Third
** Party Software they are using.
**
** If you are unsure which license is appropriate for your use, please
** contact Nokia at qt-info@nokia.com.
**
****************************************************************************/
#include "qtsinglecoreapplication.h"
#include "qtlocalpeer.h"
/*!
\class QtSingleCoreApplication qtsinglecoreapplication.h
\brief A variant of the QtSingleApplication class for non-GUI applications.
This class is a variant of QtSingleApplication suited for use in
console (non-GUI) applications. It is an extension of
QCoreApplication (instead of QApplication). It does not require
the QtGui library.
The API and usage is identical to QtSingleApplication, except that
functions relating to the "activation window" are not present, for
obvious reasons. Please refer to the QtSingleApplication
documentation for explanation of the usage.
A QtSingleCoreApplication instance can communicate to a
QtSingleApplication instance if they share the same application
id. Hence, this class can be used to create a light-weight
command-line tool that sends commands to a GUI application.
\sa QtSingleApplication
*/
/*!
Creates a QtSingleCoreApplication object. The application identifier
will be QCoreApplication::applicationFilePath(). \a argc and \a
argv are passed on to the QCoreAppliation constructor.
*/
QtSingleCoreApplication::QtSingleCoreApplication(int &argc, char **argv)
: QCoreApplication(argc, argv)
{
peer = new QtLocalPeer(this);
connect(peer, SIGNAL(messageReceived(const QString&)), SIGNAL(messageReceived(const QString&)));
}
/*!
Creates a QtSingleCoreApplication object with the application
identifier \a appId. \a argc and \a argv are passed on to the
QCoreAppliation constructor.
*/
QtSingleCoreApplication::QtSingleCoreApplication(const QString &appId, int &argc, char **argv)
: QCoreApplication(argc, argv)
{
peer = new QtLocalPeer(this, appId);
connect(peer, SIGNAL(messageReceived(const QString&)), SIGNAL(messageReceived(const QString&)));
}
/*!
Returns true if another instance of this application is running;
otherwise false.
This function does not find instances of this application that are
being run by a different user (on Windows: that are running in
another session).
\sa sendMessage()
*/
bool QtSingleCoreApplication::isRunning()
{
return peer->isClient();
}
/*!
Tries to send the text \a message to the currently running
instance. The QtSingleCoreApplication object in the running instance
will emit the messageReceived() signal when it receives the
message.
This function returns true if the message has been sent to, and
processed by, the current instance. If there is no instance
currently running, or if the running instance fails to process the
message within \a timeout milliseconds, this function return false.
\sa isRunning(), messageReceived()
*/
bool QtSingleCoreApplication::sendMessage(const QString &message, int timeout)
{
return peer->sendMessage(message, timeout);
}
/*!
Returns the application identifier. Two processes with the same
identifier will be regarded as instances of the same application.
*/
QString QtSingleCoreApplication::id() const
{
return peer->applicationId();
}
/*!
\fn void QtSingleCoreApplication::messageReceived(const QString& message)
This signal is emitted when the current instance receives a \a
message from another instance of this application.
\sa sendMessage()
*/

73
src/qtsingleapp/qtsinglecoreapplication.h Normal file
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@ -0,0 +1,73 @@
/****************************************************************************
**
** Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of a Qt Solutions component.
**
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Solutions Commercial License Agreement provided
** with the Software or, alternatively, in accordance with the terms
** contained in a written agreement between you and Nokia.
**
** 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.
**
** 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.
**
** Please note Third Party Software included with Qt Solutions may impose
** additional restrictions and it is the user's responsibility to ensure
** that they have met the licensing requirements of the GPL, LGPL, or Qt
** Solutions Commercial license and the relevant license of the Third
** Party Software they are using.
**
** If you are unsure which license is appropriate for your use, please
** contact Nokia at qt-info@nokia.com.
**
****************************************************************************/
#include <QtCore/QCoreApplication>
class QtLocalPeer;
class QtSingleCoreApplication : public QCoreApplication
{
Q_OBJECT
public:
QtSingleCoreApplication(int &argc, char **argv);
QtSingleCoreApplication(const QString &id, int &argc, char **argv);
bool isRunning();
QString id() const;
public Q_SLOTS:
bool sendMessage(const QString &message, int timeout = 5000);
Q_SIGNALS:
void messageReceived(const QString &message);
private:
QtLocalPeer* peer;
};

10
src/qtsingleapp/qtsinglecoreapplication.pri Normal file
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@ -0,0 +1,10 @@
INCLUDEPATH += $$PWD
DEPENDPATH += $$PWD
HEADERS += $$PWD/qtsinglecoreapplication.h $$PWD/qtlocalpeer.h
SOURCES += $$PWD/qtsinglecoreapplication.cpp $$PWD/qtlocalpeer.cpp
QT *= network
win32:contains(TEMPLATE, lib):contains(CONFIG, shared) {
DEFINES += QT_QTSINGLECOREAPPLICATION_EXPORT=__declspec(dllexport)
}

8
src/src.pro
View file

@ -319,6 +319,12 @@ contains(DEFINES, DISABLE_GUI) {
}
}
contains(DEFINES, DISABLE_GUI) {
include(qtsingleapp/qtsinglecoreapplication.pri)
} else {
include(qtsingleapp/qtsingleapplication.pri)
}
!contains(DEFINES, DISABLE_GUI) {
FORMS += ui/mainwindow.ui \
ui/options.ui \
@ -371,7 +377,7 @@ SOURCES += main.cpp \
trackerlist.cpp
macx {
HEADERS += qmacapplication.cpp
SOURCES += qmacapplication.cpp
}
}