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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0+ OR GPL-3.0 WITH Qt-GPL-exception-1.0
#include "qtsingleapplication.h"
#include "qtlocalpeer.h"
#include <qtlockedfile.h>
#include <QDir>
#include <QFileOpenEvent>
#include <QSharedMemory>
#include <QWidget>
namespace SharedTools {
static const int instancesSize = 1024;
static QString instancesLockFilename(const QString &appSessionId)
{
const QChar slash(QLatin1Char('/'));
QString res = QDir::tempPath();
if (!res.endsWith(slash))
res += slash;
return res + appSessionId + QLatin1String("-instances");
}
QtSingleApplication::QtSingleApplication(const QString &appId, int &argc, char **argv)
: QApplication(argc, argv),
firstPeer(-1),
pidPeer(0)
{
this->appId = appId;
const QString appSessionId = QtLocalPeer::appSessionId(appId);
// This shared memory holds a zero-terminated array of active (or crashed) instances
instances = new QSharedMemory(appSessionId, this);
actWin = 0;
block = false;
// First instance creates the shared memory, later instances attach to it
const bool created = instances->create(instancesSize);
if (!created) {
if (!instances->attach()) {
qWarning() << "Failed to initialize instances shared memory: "
<< instances->errorString();
delete instances;
instances = 0;
return;
}
}
// QtLockedFile is used to workaround QTBUG-10364
QtLockedFile lockfile(instancesLockFilename(appSessionId));
lockfile.open(QtLockedFile::ReadWrite);
lockfile.lock(QtLockedFile::WriteLock);
qint64 *pids = static_cast<qint64 *>(instances->data());
if (!created) {
// Find the first instance that it still running
// The whole list needs to be iterated in order to append to it
for (; *pids; ++pids) {
if (firstPeer == -1 && isRunning(*pids))
firstPeer = *pids;
}
}
// Add current pid to list and terminate it
*pids++ = QCoreApplication::applicationPid();
*pids = 0;
pidPeer = new QtLocalPeer(this, appId + QLatin1Char('-') +
QString::number(QCoreApplication::applicationPid()));
connect(pidPeer, &QtLocalPeer::messageReceived, this, &QtSingleApplication::messageReceived);
pidPeer->isClient();
lockfile.unlock();
}
QtSingleApplication::~QtSingleApplication()
{
if (!instances)
return;
const qint64 appPid = QCoreApplication::applicationPid();
QtLockedFile lockfile(instancesLockFilename(QtLocalPeer::appSessionId(appId)));
lockfile.open(QtLockedFile::ReadWrite);
lockfile.lock(QtLockedFile::WriteLock);
// Rewrite array, removing current pid and previously crashed ones
qint64 *pids = static_cast<qint64 *>(instances->data());
qint64 *newpids = pids;
for (; *pids; ++pids) {
if (*pids != appPid && isRunning(*pids))
*newpids++ = *pids;
}
*newpids = 0;
lockfile.unlock();
}
bool QtSingleApplication::event(QEvent *event)
{
if (event->type() == QEvent::FileOpen) {
QFileOpenEvent *foe = static_cast<QFileOpenEvent*>(event);
emit fileOpenRequest(foe->file());
return true;
}
return QApplication::event(event);
}
bool QtSingleApplication::isRunning(qint64 pid)
{
if (pid == -1) {
pid = firstPeer;
if (pid == -1)
return false;
}
QtLocalPeer peer(this, appId + QLatin1Char('-') + QString::number(pid, 10));
return peer.isClient();
}
bool QtSingleApplication::sendMessage(const QString &message, int timeout, qint64 pid)
{
if (pid == -1) {
pid = firstPeer;
if (pid == -1)
return false;
}
QtLocalPeer peer(this, appId + QLatin1Char('-') + QString::number(pid, 10));
return peer.sendMessage(message, timeout, block);
}
QString QtSingleApplication::applicationId() const
{
return appId;
}
void QtSingleApplication::setBlock(bool value)
{
block = value;
}
void QtSingleApplication::setActivationWindow(QWidget *aw, bool activateOnMessage)
{
actWin = aw;
if (!pidPeer)
return;
if (activateOnMessage)
connect(pidPeer, &QtLocalPeer::messageReceived, this, &QtSingleApplication::activateWindow);
else
disconnect(pidPeer, &QtLocalPeer::messageReceived, this, &QtSingleApplication::activateWindow);
}
QWidget* QtSingleApplication::activationWindow() const
{
return actWin;
}
void QtSingleApplication::activateWindow()
{
if (actWin) {
actWin->setWindowState(actWin->windowState() & ~Qt::WindowMinimized);
actWin->raise();
actWin->activateWindow();
}
}
} // namespace SharedTools
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