fix: fix flash black on login

This will work as intended.

Author: calsys456

src/common/VirtualTerminal.cpp

@@ -207,7 +207,7 @@ namespace DDM {
             return vt;
         }
 
-        void jumpToVt(int vt, bool vt_auto) {
+        void jumpToVt(int vt, bool vt_auto, bool wait) {
             qDebug() << "Jumping to VT" << vt;
 
             int fd;
@@ -257,7 +257,7 @@ namespace DDM {
                     break;
                 }
 
-                if (ioctl(fd, VT_WAITACTIVE, vt) < 0 && errno != EINTR)
+                if (wait && ioctl(fd, VT_WAITACTIVE, vt) < 0 && errno != EINTR)
                     qWarning("Couldn't finalize jump to VT %d: %s", vt, strerror(errno));
 
             } while (errno == EINTR);

src/common/VirtualTerminal.h

@@ -29,7 +29,7 @@ namespace DDM {
         bool handleVtSwitches(int fd);
         int currentVt();
         int setUpNewVt();
-        void jumpToVt(int vt, bool vt_auto);
+        void jumpToVt(int vt, bool vt_auto, bool wait = true);
         void setVtSignalHandler(std::function<void()> onAcquireDisplay, std::function<void()> onReleaseDisplay);
     }
 }

src/daemon/Display.cpp

@@ -130,7 +130,7 @@ namespace DDM {
     }
 
     void Display::activateSession(const QString &user, int xdgSessionId) {
-        if (xdgSessionId <= 0 && user != QStringLiteral("ddm")) {
+        if (xdgSessionId <= 0 && user != QStringLiteral("dde")) {
             qCritical() << "Invalid xdg session id" << xdgSessionId << "for user" << user;
             return;
         }
@@ -336,13 +336,11 @@ namespace DDM {
 
         // Exec the desktop process
         connect(auth, &Auth::userProcessFinished, this, &Display::userProcessFinished);
-        // FIXME: Someone is triggering VT RELDISP signal during
-        // fork(), which will cause dead lock on glibc malloc arena
-        // lock. We have to disable our own VT signal handling
-        // temporarily...
-        VirtualTerminal::setVtSignalHandler(nullptr, nullptr);
-        auth->startUserProcess(session.exec(), cookie);
-        daemonApp->treelandConnector()->setSignalHandler();
+        VirtualTerminal::jumpToVt(auth->tty, false, false);
+        auto exec = session.exec();
+        QMetaObject::invokeMethod(this, [auth, exec, cookie] {
+            auth->startUserProcess(exec, cookie);
+        });
 
         // The user process is ongoing, append to active auths
         // The auth will be delete later in userProcessFinished()