From e128a1b4ea74f02bc4a9047ea0e95e7563e6d3ac Mon Sep 17 00:00:00 2001
From: Martin Briza <mbriza@redhat.com>
Date: Wed, 2 Nov 2016 17:13:40 +0100
Subject: [PATCH] Switch to another managed VT when the current one quits

---
 src/daemon/Seat.cpp | 27 +++++++++++++++++++++++++--
 1 file changed, 25 insertions(+), 2 deletions(-)

diff --git a/src/daemon/Seat.cpp b/src/daemon/Seat.cpp
index 3ef1b2f..966d445 100644
--- a/src/daemon/Seat.cpp
+++ b/src/daemon/Seat.cpp
@@ -30,6 +30,12 @@
 
 #include <functional>
 
+#include <linux/vt.h>
+#include <linux/kd.h>
+#include <sys/ioctl.h>
+#include <fcntl.h>
+#include <unistd.h>
+
 namespace SDDM {
     int findUnused(int minimum, std::function<bool(const int)> used) {
         // initialize with minimum
@@ -84,7 +90,6 @@ namespace SDDM {
     void Seat::removeDisplay(Display* display) {
         qDebug() << "Removing display" << display->displayId() << "...";
 
-
         // remove display from list
         m_displays.removeAll(display);
 
@@ -102,12 +107,30 @@ namespace SDDM {
 
     void Seat::displayStopped() {
         Display *display = qobject_cast<Display *>(sender());
+        int oldVT = display->terminalId();
 
         // remove display
         removeDisplay(display);
 
+        // try switching to some other active VT
+        bool success = false;
+        char path[33] = { 0 };
+        snprintf(path, 32, "/dev/tty%d", oldVT);
+        int ttyfd = open(path, O_RDONLY);
+
+        if (ttyfd >= 0) {
+            for (int newVT : m_terminalIds) {
+                int result = ioctl(ttyfd, VT_ACTIVATE, newVT);
+                if (result == 0) {
+                    success = true;
+                    break;
+                }
+            }
+            close(ttyfd);
+        }
+
         // restart otherwise
-        if (m_displays.isEmpty())
+        if (!success)
             createDisplay();
     }
 }