Fixed bug with event notifier being notified with a bad eventfd

src/DebugServers/DebugServer.cpp

@@ -32,7 +32,6 @@ void DebugServer::startup() {
     this->eventManager.registerListener(this->eventListener);
 
     this->interruptEventNotifier = std::make_shared<EventNotifier>();
-    this->interruptEventNotifier->init();
     this->eventListener->setInterruptEventNotifier(this->interruptEventNotifier);
 
     // Register event handlers
@@ -52,8 +51,8 @@ void DebugServer::shutdown() {
     this->setThreadState(ThreadState::SHUTDOWN_INITIATED);
     Logger::info("Shutting down DebugServer");
     this->close();
-    this->interruptEventNotifier->close();
     this->setThreadStateAndEmitEvent(ThreadState::STOPPED);
+    this->eventManager.deregisterListener(this->eventListener->getId());
 }
 
 void DebugServer::onShutdownDebugServerEvent(EventPointer<Events::ShutdownDebugServer> event) {

src/EventManager/EventListener.cpp

@@ -31,7 +31,7 @@ void EventListener::registerEvent(GenericEventPointer event) {
     eventQueueByType[eventName].push(event);
     this->eventQueueByEventTypeCV.notify_all();
 
-    if (this->interruptEventNotifier != nullptr) {
+    if (this->interruptEventNotifier != nullptr && this->interruptEventNotifier->isInitialised()) {
         this->interruptEventNotifier->notify();
     }
 }

src/Helpers/EventNotifier.hpp

@@ -4,6 +4,7 @@
 #include <errno.h>
 #include <fcntl.h>
 #include <unistd.h>
+#include <atomic>
 
 #include "src/Exceptions/Exception.hpp"
 
@@ -26,9 +27,7 @@ namespace Bloom
     {
     private:
         int fileDescriptor = -1;
-
-    public:
-        EventNotifier() = default;
+        std::atomic<bool> initialised = false;
 
         void init() {
             this->fileDescriptor = ::eventfd(0, EFD_NONBLOCK);
@@ -37,12 +36,34 @@ namespace Bloom
                 throw Exceptions::Exception("Failed to create new eventfd object - error number: "
                     + std::to_string(errno));
             }
+
+            this->initialised = true;
+        }
+
+        void close() {
+            ::close(this->fileDescriptor);
+            this->initialised = false;
+        }
+
+    public:
+        EventNotifier() {
+            this->init();
+        };
+
+        ~EventNotifier() {
+            if (this->initialised) {
+                this->close();
+            }
         }
 
         int getFileDescriptor() {
             return this->fileDescriptor;
         }
 
+        bool isInitialised() {
+            return this->initialised;
+        }
+
         void notify() {
             if (::eventfd_write(this->fileDescriptor, 1) < 0) {
                 throw Exceptions::Exception("Failed to increment eventfd counter - error number: "
@@ -57,9 +78,5 @@ namespace Bloom
                     "error number: " + std::to_string(errno));
             }
         }
-
-        void close() {
-            ::close(this->fileDescriptor);
-        }
     };
 }