fix: avoid memory leak

as title

Log: as title
Pms: BUG-318023

Author: yixinshark

src/dde-session/main.cpp

@@ -93,20 +93,19 @@ int main(int argc, char *argv[])
         org::freedesktop::systemd1::Manager systemdDBus("org.freedesktop.systemd1", "/org/freedesktop/systemd1", QDBusConnection::sessionBus());
         startSystemdUnit(systemdDBus, dmService, "replace");
 
-        QDBusServiceWatcher *watcher = new QDBusServiceWatcher("org.deepin.dde.Session1", QDBusConnection::sessionBus(), QDBusServiceWatcher::WatchForUnregistration);
+        QDBusServiceWatcher *watcher = new QDBusServiceWatcher("org.deepin.dde.Session1", QDBusConnection::sessionBus(), QDBusServiceWatcher::WatchForUnregistration, &app);
         watcher->connect(watcher, &QDBusServiceWatcher::serviceUnregistered, [&] {
             qInfo() << "dde session exit";
             startSystemdUnit(systemdDBus, "dde-session-exit-task.service", "replace");
             qApp->quit();
         });
-        pid_t curPid = getpid();
-        QThreadPool::globalInstance()->start([curPid]() {
-            qInfo()<<"leader pipe thread id: " << QThread::currentThreadId() << ", pid: " << curPid;
-            Fifo *fifo = new Fifo;
+
+        {   // none block
+            pid_t curPid = getpid();
+            Fifo *fifo = new Fifo(&app);
             fifo->OpenWrite();
             fifo->Write(QString::number(curPid));
-        });
-
+        }
         // We started the unit, open <dbus> and sleep forever.
         return app.exec();
     }
@@ -116,7 +115,7 @@ int main(int argc, char *argv[])
     // QProcess no block "/usr/bin/deepin-keyring-whitebox", "--opt-client=waitfifonotify"),BUG-255907
     QProcess::startDetached("/usr/bin/deepin-keyring-whitebox", QStringList() << "--opt-client=waitfifonotify");
 
-    auto* session = new Session;
+    auto* session = new Session(&app);
     new Session1Adaptor(session);
     QDBusConnection::sessionBus().registerService("org.deepin.dde.Session1");
     QDBusConnection::sessionBus().registerObject("/org/deepin/dde/Session1", "org.deepin.dde.Session1", session);
@@ -126,7 +125,7 @@ int main(int argc, char *argv[])
     QDBusConnection::sessionBus().registerService("org.deepin.dde.SessionManager1");
     QDBusConnection::sessionBus().registerObject("/org/deepin/dde/SessionManager1", "org.deepin.dde.SessionManager1", SessionManager::instance());
 
-    auto *wmSwitcher = new WMSwitcher();
+    auto *wmSwitcher = new WMSwitcher(&app);
     new WMSwitcher1Adaptor(wmSwitcher);
     QDBusConnection::sessionBus().registerService("org.deepin.dde.WMSwitcher1");
     QDBusConnection::sessionBus().registerObject("/org/deepin/dde/WMSwitcher1", wmSwitcher);
@@ -151,7 +150,7 @@ int main(int argc, char *argv[])
 
     QThreadPool::globalInstance()->start([&session]() {
         qInfo()<< "systemd service pipe thread id: " << QThread::currentThreadId();
-        Fifo *fifo = new Fifo;
+        Fifo *fifo = new Fifo();
         fifo->OpenRead();
         qInfo() << "pipe open read finish";
         QString CurSessionPid;
@@ -166,6 +165,7 @@ int main(int argc, char *argv[])
                 session->setSessionPath();
             }
         }
+        fifo->deleteLater();
         qInfo() << "pipe read finish, app exit.";
         qApp->quit();
     });

src/utils/fifo.cpp

@@ -13,8 +13,9 @@
 #include <errno.h>
 #include <QDebug>
 
-Fifo::Fifo()
-    : m_fd(-1)
+Fifo::Fifo(QObject *parent)
+    : QObject(parent)
+    , m_fd(-1)
 {
     m_fifoPath = QString(getenv("HOME")) + "/.cache/dde-session-fifo";
 }

src/utils/fifo.h

@@ -10,9 +10,10 @@
 
 class Fifo : public QObject
 {
+    Q_OBJECT
 public:
-    Fifo();
-    ~Fifo();
+    Fifo(QObject *parent = nullptr);
+    virtual ~Fifo();
 
     int Read(QString &data);
     int Write(QString data);