Implement signal handling to gracefully stop the application

src/app/sdl3_app.hpp

@@ -59,6 +59,7 @@ class Sdl3App {
 public:
     explicit Sdl3App(const std::filesystem::path& scriptPath, bool luaDebug = false);
     void Run();
+    static bool ShouldStop();
 
 private:
     struct RenderObject {

src/app/sdl3_app_core.cpp

@@ -2,7 +2,9 @@
 #include "app/sdl3_app.hpp"
 #include "app/trace.hpp"
 
+#include <atomic>
 #include <chrono>
+#include <csignal>
 #include <fstream>
 #include <iostream>
 #include <sstream>
@@ -14,6 +16,8 @@
 
 namespace sdl3cpp::app {
 
+extern std::atomic<bool> g_signalReceived;
+
 std::vector<char> ReadFile(const std::string& path) {
     TRACE_FUNCTION();
     
@@ -116,6 +120,10 @@ Sdl3App::Sdl3App(const std::filesystem::path& scriptPath, bool luaDebug)
     TRACE_VAR(scriptPath);
 }
 
+bool Sdl3App::ShouldStop() {
+    return g_signalReceived.load();
+}
+
 void Sdl3App::Run() {
     TRACE_FUNCTION();
     InitSDL();
@@ -219,6 +227,10 @@ void Sdl3App::MainLoop() {
     bool running = true;
     auto start = std::chrono::steady_clock::now();
     while (running) {
+        if (ShouldStop()) {
+            running = false;
+            break;
+        }
         SDL_Event event;
         while (SDL_PollEvent(&event)) {
             if (event.type == SDL_EVENT_QUIT) {

src/main.cpp

@@ -5,6 +5,8 @@
 #include <rapidjson/writer.h>
 #include <rapidjson/prettywriter.h>
 
+#include <atomic>
+#include <csignal>
 #include <cstdlib>
 #include <cstdint>
 #include <exception>
@@ -20,8 +22,23 @@
 #include "app/sdl3_app.hpp"
 #include <SDL3/SDL_main.h>
 
+namespace sdl3cpp::app {
+std::atomic<bool> g_signalReceived{false};
+}
+
 namespace {
 
+void SignalHandler(int signal) {
+    if (signal == SIGINT || signal == SIGTERM) {
+        sdl3cpp::app::g_signalReceived.store(true);
+    }
+}
+
+void SetupSignalHandlers() {
+    std::signal(SIGINT, SignalHandler);
+    std::signal(SIGTERM, SignalHandler);
+}
+
 std::filesystem::path FindScriptPath(const char* argv0) {
     std::filesystem::path executable;
     if (argv0 && *argv0 != '\0') {
@@ -294,6 +311,7 @@ void WriteRuntimeConfigJson(const RuntimeConfig& runtimeConfig,
 
 int main(int argc, char** argv) {
     SDL_SetMainReady();
+    SetupSignalHandlers();
     try {
         AppOptions options = ParseCommandLine(argc, argv);
         sdl3cpp::app::TraceLogger::SetEnabled(options.traceEnabled);