coreinit+UI: Implement exit()

When coreinit exit() is hit, then Cemu will only close when the game was launched directly via command line parameters (-g or -t). Otherwise it returns to the game list. In the case where Cemu closes it will forward the coreinit exit status code as it's own exit status code. This is useful for cases where Cemu is used as a CLI tool for testing homebrew

src/Cafe/CafeSystem.cpp

@@ -443,6 +443,7 @@ namespace CafeSystem
 	static SystemImplementation* s_implementation{nullptr};
     bool sLaunchModeIsStandalone = false;
 	std::optional<std::vector<std::string>> s_overrideArgs;
+	std::optional<sint32> s_foregroundReturnStatus;
 
 	bool sSystemRunning = false;
 	TitleId sForegroundTitleId = 0;
@@ -836,6 +837,7 @@ namespace CafeSystem
 	{
 		CafeTitleList::WaitForMandatoryScan();
 		sLaunchModeIsStandalone = false;
+		s_foregroundReturnStatus = std::nullopt;
         _pathToExecutable.clear();
 		TitleIdParser tip(titleId);
 		if (tip.GetType() == TitleIdParser::TITLE_TYPE::AOC || tip.GetType() == TitleIdParser::TITLE_TYPE::BASE_TITLE_UPDATE)
@@ -1186,4 +1188,15 @@ namespace CafeSystem
 		s_implementation->CafeRecreateCanvas();
 	}
 
+	void NotifyPPCProcessExit(sint32 status)
+	{
+		s_foregroundReturnStatus = status;
+		s_implementation->CafePPCProcessExit();
+	}
+
+	std::optional<sint32> GetForegroundTitleReturnStatus()
+	{
+		return s_foregroundReturnStatus;
+	}
+
 }

src/Cafe/CafeSystem.h

@@ -12,6 +12,7 @@ namespace CafeSystem
 	{
 	public:
 		virtual void CafeRecreateCanvas() = 0;
+		virtual void CafePPCProcessExit() = 0; // emulated process exited
 	};
 
 	enum class PREPARE_STATUS_CODE
@@ -43,6 +44,7 @@ namespace CafeSystem
 	std::string GetForegroundTitleArgStr();
 	uint32 GetForegroundTitleOlvAccesskey();
 	CosCapabilityBits GetForegroundTitleCosCapabilities(CosCapabilityGroup group);
+	std::optional<sint32> GetForegroundTitleReturnStatus(); // valid once the foreground title exited gracefully via coreinit exit
 
 	void ShutdownTitle();
 
@@ -55,6 +57,8 @@ namespace CafeSystem
 	uint32 GetRPXHashUpdated();
 
 	void RequestRecreateCanvas();
+	void NotifyPPCProcessExit(sint32 status);
+
 };
 
 extern RPLModule* applicationRPX;

src/Cafe/OS/libs/coreinit/coreinit.cpp

@@ -238,15 +238,6 @@ namespace coreinit
 		osLib_returnFromFunction(hCPU, 1);
 	}
 
-	void coreinit_exit(uint32 r)
-	{
-		cemuLog_log(LogType::Force, "The title terminated the process by calling coreinit.exit({})", (sint32)r);
-        DebugLogStackTrace(coreinit::OSGetCurrentThread(), coreinit::OSGetStackPointer());
-		cemu_assert_debug(false);
-		// never return
-		while (true) std::this_thread::sleep_for(std::chrono::milliseconds(100));
-	}
-
 	bool OSIsOffBoot()
 	{
 		return true;
@@ -289,7 +280,6 @@ namespace coreinit
 
 		osLib_addFunction("coreinit", "ENVGetEnvironmentVariable", coreinitExport_ENVGetEnvironmentVariable);
 
-		cafeExportRegisterFunc(coreinit_exit, "coreinit", "exit", LogType::CoreinitThread);
 		cafeExportRegister("coreinit", OSIsOffBoot, LogType::CoreinitThread);
 		cafeExportRegister("coreinit", OSGetBootPMFlags, LogType::CoreinitThread);
 		cafeExportRegister("coreinit", OSGetSystemMode, LogType::CoreinitThread);

src/Cafe/OS/libs/coreinit/coreinit.h

@@ -15,13 +15,13 @@ void coreinitAsyncCallback_addWithLock(MPTR functionMPTR, uint32 numParameters,
 // coreinit shared memory
 struct CoreinitSharedData
 {
-	MEMPTR<void> MEMAllocFromDefaultHeap;
-	MEMPTR<void> MEMAllocFromDefaultHeapEx;
-	MEMPTR<void> MEMFreeToDefaultHeap;
-	MPTR __atexit_cleanup;
-	MPTR __cpp_exception_init_ptr;
-	MPTR __cpp_exception_cleanup_ptr;
-	MPTR __stdio_cleanup;
+	MEMPTR<void> MEMAllocFromDefaultHeap{nullptr};
+	MEMPTR<void> MEMAllocFromDefaultHeapEx{nullptr};
+	MEMPTR<void> MEMFreeToDefaultHeap{nullptr};
+	MEMPTR<void> __atexit_cleanup{nullptr};
+	MEMPTR<void> __stdio_cleanup{nullptr};
+	MPTR __cpp_exception_init_ptr{0};
+	MPTR __cpp_exception_cleanup_ptr{0};
 };
 
 extern CoreinitSharedData* gCoreinitData;

src/Cafe/OS/libs/coreinit/coreinit_Misc.cpp

@@ -693,7 +693,6 @@ namespace coreinit
 		return s_sdkVersion;
 	}
 
-	// move this to CafeSystem.cpp?
 	void OSLauncherThread(uint64 titleId)
 	{
 		CafeSystem::ShutdownTitle();
@@ -702,6 +701,12 @@ namespace coreinit
 		CafeSystem::LaunchForegroundTitle();
 	}
 
+	void OSShutdownThread(sint32 status)
+	{
+		CafeSystem::ShutdownTitle();
+		CafeSystem::NotifyPPCProcessExit(status);
+	}
+
 	uint32 __LaunchByTitleId(uint64 titleId, uint32 argc, MEMPTR<char>* argv)
 	{
 		// prepare argument buffer
@@ -851,6 +856,26 @@ namespace coreinit
 		return 0;
 	}
 
+	void __PPCExit(sint32 status)
+	{
+		// spawn shutdown thread (the current thread has to be destroyed as part of the shutdown process)
+		std::thread shutdownThread(OSShutdownThread, status);
+		shutdownThread.detach();
+		// suspend this thread
+		coreinit::OSSuspendThread(coreinit::OSGetCurrentThread());
+	}
+
+	void coreinit_exit(sint32 status)
+	{
+		cemuLog_log(LogType::Force, "The title terminated the process by calling coreinit.exit({})", (sint32)status);
+		DebugLogStackTrace(coreinit::OSGetCurrentThread(), coreinit::OSGetStackPointer());
+		if (gCoreinitData->__atexit_cleanup)
+			PPCCoreCallback(gCoreinitData->__atexit_cleanup, status);
+		if (gCoreinitData->__stdio_cleanup)
+			PPCCoreCallback(gCoreinitData->__stdio_cleanup);
+		__PPCExit(status);
+	}
+
 	void miscInit()
 	{
 		s_currentTitleId = CafeSystem::GetForegroundTitleId();
@@ -886,6 +911,9 @@ namespace coreinit
 
 		cafeExportRegister("coreinit", OSDriver_Register, LogType::Placeholder);
 		cafeExportRegister("coreinit", OSDriver_Deregister, LogType::Placeholder);
+
+		cafeExportRegisterFunc(coreinit_exit, "coreinit", "exit", LogType::CoreinitThread);
+		cafeExportRegister("coreinit", __PPCExit, LogType::CoreinitThread);
 	}
 
 };

src/gui/wxgui/CemuApp.cpp

@@ -34,6 +34,7 @@
 
 #include "Cafe/TitleList/TitleList.h"
 #include "Cafe/TitleList/SaveList.h"
+#include "Cafe/CafeSystem.h"
 
 wxIMPLEMENT_APP_NO_MAIN(CemuApp);
 
@@ -414,17 +415,19 @@ int CemuApp::OnExit()
 		m_sdlEventPumpTimer = nullptr;
 	}
 #endif
-
 	wxApp::OnExit();
 	wxTheClipboard->Flush();
 	InputManager::instance().Shutdown();
+	int retValue = 0;
+	if (auto r = CafeSystem::GetForegroundTitleReturnStatus(); (LaunchSettings::GetLoadFile() || LaunchSettings::GetLoadTitleID()) && r)
+		retValue = *r;
 #if BOOST_OS_MACOS
 	SDLControllerProvider::ShutdownSDL();
 #endif
 #if BOOST_OS_WINDOWS
-	ExitProcess(0);
+	ExitProcess(retValue);
 #else
-	_Exit(0);
+	_Exit(retValue);
 #endif
 }
 

src/gui/wxgui/MainWindow.cpp

@@ -162,6 +162,7 @@ wxDEFINE_EVENT(wxEVT_SET_WINDOW_TITLE, wxCommandEvent);
 wxDEFINE_EVENT(wxEVT_REQUEST_GAMELIST_REFRESH, wxCommandEvent);
 wxDEFINE_EVENT(wxEVT_LAUNCH_GAME, wxLaunchGameEvent);
 wxDEFINE_EVENT(wxEVT_REQUEST_RECREATE_CANVAS, wxCommandEvent);
+wxDEFINE_EVENT(wxEVT_REQUEST_GAME_EXIT, wxCommandEvent);
 
 wxBEGIN_EVENT_TABLE(MainWindow, wxFrame)
 EVT_TIMER(MAINFRAME_ID_TIMER1, MainWindow::OnTimer)
@@ -243,6 +244,7 @@ EVT_COMMAND(wxID_ANY, wxEVT_ACCOUNTLIST_REFRESH, MainWindow::OnAccountListRefres
 EVT_COMMAND(wxID_ANY, wxEVT_SET_WINDOW_TITLE, MainWindow::OnSetWindowTitle)
 
 EVT_COMMAND(wxID_ANY, wxEVT_REQUEST_RECREATE_CANVAS, MainWindow::OnRequestRecreateCanvas)
+EVT_COMMAND(wxID_ANY, wxEVT_REQUEST_GAME_EXIT, MainWindow::OnRequestGameExit)
 
 wxEND_EVENT_TABLE()
 
@@ -2469,6 +2471,27 @@ void MainWindow::CafeRecreateCanvas()
 	sem.decrementWithWait();
 }
 
+void MainWindow::CafePPCProcessExit()
+{
+	// this is called from the emulated PPC thread, so queue an event instead of handling it directly
+	wxQueueEvent(g_mainFrame, new wxCommandEvent(wxEVT_REQUEST_GAME_EXIT));
+}
+
+void MainWindow::OnRequestGameExit(wxCommandEvent& event)
+{
+	// if the title was launched via the command line we close Cemu and use the foreground title's exit status as Cemu's process return code (via CemuApp:OnExit)
+	// this is useful for homebrew testing setups that use Cemu via CLI
+	// otherwise the title was launched from the game list, so we just stop it and return to the game list instead of closing Cemu
+	if (LaunchSettings::GetLoadFile() || LaunchSettings::GetLoadTitleID())
+	{
+		Close();
+	}
+	else
+	{
+		EndEmulation();
+	}
+}
+
 bool MainWindow::FullscreenEnabled() const
 {
 	return LaunchSettings::FullscreenEnabled().value_or(GetWxGUIConfig().fullscreen);

src/gui/wxgui/MainWindow.h

@@ -157,8 +157,10 @@ private:
 
 	// CafeSystem implementation
 	void CafeRecreateCanvas() override;
+	void CafePPCProcessExit() override;
 
 	void OnRequestRecreateCanvas(wxCommandEvent& event);
+	void OnRequestGameExit(wxCommandEvent& event);
 
 	wxRect GetDesktopRect();