Fix very high cpu usage when a console fenrir under root and an x fenrir under your user are running at the same time.

src/fenrirscreenreader/core/remoteInstanceRegistry.py

@@ -12,6 +12,7 @@ import time
 
 
 INSTANCE_TIMEOUT_SEC = 30.0
+REGISTRY_DIR_MODE = 0o1777
 
 
 def get_registry_dir():
@@ -26,8 +27,8 @@ def get_instance_file(pid=None):
 
 def write_instance(instance_data):
     registry_dir = get_registry_dir()
-    os.makedirs(registry_dir, mode=0o755, exist_ok=True)
-    os.chmod(registry_dir, 0o755)
+    os.makedirs(registry_dir, mode=REGISTRY_DIR_MODE, exist_ok=True)
+    os.chmod(registry_dir, REGISTRY_DIR_MODE)
     prune_stale_instances()
     instance_data["updated_at"] = time.time()
     instance_path = get_instance_file(instance_data.get("pid"))

src/fenrirscreenreader/remoteDriver/unixDriver.py

@@ -114,6 +114,17 @@ class driver(remoteDriver):
         }
         remoteInstanceRegistry.write_instance(instance_data)
 
+    def _try_register_instance(self):
+        try:
+            self._register_instance()
+            return True
+        except Exception as e:
+            self.env["runtime"]["DebugManager"].write_debug_out(
+                "unixDriver could not register instance: " + str(e),
+                debug.DebugLevel.ERROR,
+            )
+            return False
+
     def _socket_file_matches_socket(self, fenrir_sock, socket_file):
         try:
             if os.stat(socket_file).st_uid != os.getuid():
@@ -328,11 +339,11 @@ class driver(remoteDriver):
         if not self.fenrirSocks:
             return
 
-        self._register_instance()
+        self._try_register_instance()
         last_register = time.time()
         while active.value:
             if time.time() - last_register > 10.0:
-                self._register_instance()
+                self._try_register_instance()
                 last_register = time.time()
 
             # Check if the client is still connected and if data is available: