The application startup can now be aborted via an OS signal or using the configured keyboard quit shortcut.

es-app/src/SystemData.cpp

@@ -15,6 +15,7 @@
 #include "FileFilterIndex.h"
 #include "FileSorts.h"
 #include "GamelistFileParser.h"
+#include "InputManager.h"
 #include "Log.h"
 #include "Settings.h"
 #include "ThemeData.h"
@@ -32,9 +33,6 @@
 #include <pugixml.hpp>
 #include <random>
 
-std::vector<SystemData*> SystemData::sSystemVector;
-std::unique_ptr<FindRules> SystemData::sFindRules;
-
 FindRules::FindRules()
 {
     LOG(LogInfo) << "Loading emulator find rules...";
@@ -544,7 +542,13 @@ bool SystemData::loadConfig()
              system = system.next_sibling("system")) {
             // Poll events so that the OS doesn't think the application is hanging on startup,
             // this is required as the main application loop hasn't started yet.
-            while (SDL_PollEvent(&event)) {};
+            while (SDL_PollEvent(&event)) {
+                InputManager::getInstance().parseEvent(event);
+                if (event.type == SDL_QUIT) {
+                    sStartupExitSignal = true;
+                    return true;
+                }
+            };
 
             std::string name;
             std::string fullname;

es-app/src/SystemData.h

@@ -114,8 +114,9 @@ public:
     // Generates the game system directories and information files based on es_systems.xml.
     static bool createSystemDirectories();
 
-    static std::vector<SystemData*> sSystemVector;
-    static std::unique_ptr<FindRules> sFindRules;
+    static inline std::vector<SystemData*> sSystemVector;
+    static inline std::unique_ptr<FindRules> sFindRules;
+    static inline bool sStartupExitSignal {false};
 
     const bool isCollection() const { return mIsCollectionSystem; }
     const bool isCustomCollection() const { return mIsCustomCollectionSystem; }

es-app/src/main.cpp

@@ -704,6 +704,7 @@ int main(int argc, char* argv[])
     ThemeData::populateThemeSets();
     loadSystemsReturnCode loadSystemsStatus {loadSystemConfigFile()};
 
+    if (!SystemData::sStartupExitSignal) {
         if (loadSystemsStatus) {
             // If there was an issue parsing the es_systems.xml file, display an error message.
             // If there were no game files found, give the option to the user to quit or to
@@ -717,7 +718,7 @@ int main(int argc, char* argv[])
             }
         }
 
-    // Check if any of the enabled systems has an invalid alternative emulator entry,
+        // Check if any of the enabled systems have an invalid alternative emulator entry,
         // which means that a label is present in the gamelist.xml file which is not matching
         // any command tag in es_systems.xml.
         for (auto system : SystemData::sSystemVector) {
@@ -730,16 +731,17 @@ int main(int argc, char* argv[])
         // Don't generate controller events while we're loading.
         SDL_GameControllerEventState(SDL_DISABLE);
 
-    // Preload what we can right away instead of waiting for the user to select it.
-    // This makes for no delays when accessing content, but a longer startup time.
+        // Preload system view and all gamelist views.
         ViewController::getInstance()->preload();
+    }
 
+    if (!SystemData::sStartupExitSignal) {
         if (loadSystemsStatus == loadSystemsReturnCode::LOADING_OK) {
             LOG(LogInfo) << "Finished loading theme set \"" << ThemeData::getCurrentThemeSetName()
                          << "\"";
         }
 
-    // Open the input configuration GUI if the flag to force this was passed from the command line.
+        // Open the input configuration GUI if the force flag was passed from the command line.
         if (!loadSystemsStatus) {
             if (forceInputConfig) {
                 window->pushGui(new GuiDetectDevice(
@@ -763,11 +765,17 @@ int main(int argc, char* argv[])
 
         // Main application loop.
 
+        if (!SystemData::sStartupExitSignal) {
 #if defined(__EMSCRIPTEN__)
             emscripten_set_main_loop(&applicationLoop, 0, 1);
 #else
             applicationLoop();
 #endif
+        }
+    }
+    else {
+        LOG(LogInfo) << "Exit signal received, aborting application startup";
+    }
 
     while (window->peekGui() != ViewController::getInstance())
         delete window->peekGui();

es-app/src/views/ViewController.cpp

@@ -1101,7 +1101,13 @@ void ViewController::preload()
          it != SystemData::sSystemVector.cend(); ++it) {
         // Poll events so that the OS doesn't think the application is hanging on startup,
         // this is required as the main application loop hasn't started yet.
-        while (SDL_PollEvent(&event)) {};
+        while (SDL_PollEvent(&event)) {
+            InputManager::getInstance().parseEvent(event);
+            if (event.type == SDL_QUIT) {
+                SystemData::sStartupExitSignal = true;
+                return;
+            }
+        };
 
         const std::string entryType {(*it)->isCustomCollection() ? "custom collection" : "system"};
         LOG(LogDebug) << "ViewController::preload(): Populating gamelist for " << entryType << " \""