- sanitized exit code a bit

Instead of trying a homegrown way to avoid recursive exceptions, let's do it with the defined procedure C++ has for this case: call std::terminate.

This allowed removing some old hackery inherited from Boom and will now hopefully allow sanitizing the exit procedure to the point that it can be done without depending on exit handlers.

src/d_main.cpp

@@ -108,6 +108,7 @@ EXTERN_CVAR(Bool, hud_althud)
 EXTERN_CVAR(Int, vr_mode)
 void DrawHUD();
 void D_DoAnonStats();
+void I_DetectOS;
 
 
 // MACROS ------------------------------------------------------------------
@@ -2267,6 +2268,15 @@ static void CheckCmdLine()
 	}
 }
 
+void I_Quit()
+{
+	if (demorecording)
+	{
+		G_CheckDemoStatus();
+	}
+
+	C_DeinitConsole();
+}
 
 //==========================================================================
 //
@@ -2287,6 +2297,7 @@ void D_DoomMain (void)
 
 	C_InitConsole(80*8, 25*8, false);
 	I_DetectOS();
+	atterm(I_Quit);
 
 	// +logfile gets checked too late to catch the full startup log in the logfile so do some extra check for it here.
 	FString logfile = Args->TakeValue("+logfile");

src/posix/cocoa/i_main.mm

@@ -149,24 +149,7 @@ void OriginalMainTry(int argc, char** argv)
 {
 	Args = new FArgs(argc, argv);
 
-	/*
-	 killough 1/98:
-
-	 This fixes some problems with exit handling
-	 during abnormal situations.
-
-	 The old code called I_Quit() to end program,
-	 while now I_Quit() is installed as an exit
-	 handler and exit() is called to exit, either
-	 normally or abnormally. Seg faults are caught
-	 and the error handler is used, to prevent
-	 being left in graphics mode or having very
-	 loud SFX noise because the sound card is
-	 left in an unstable state.
-	 */
-
 	atexit(call_terms);
-	atterm(I_Quit);
 
 	NSString* exePath = [[NSBundle mainBundle] executablePath];
 	progdir = [[exePath stringByDeletingLastPathComponent] UTF8String];

src/posix/cocoa/i_system.mm

@@ -93,20 +93,6 @@ void I_Init(void)
 	I_InitSound();
 }
 
-static int has_exited;
-
-void I_Quit()
-{
-	has_exited = 1; // Prevent infinitely recursive exits -- killough
-
-	if (demorecording)
-	{
-		G_CheckDemoStatus();
-	}
-
-	C_DeinitConsole();
-}
-
 
 extern FILE* Logfile;
 bool gameisdead;
@@ -137,12 +123,7 @@ static void I_FatalError(const char* const error, va_list ap)
 		fprintf(stderr, "%s\n", errortext);
 		exit(-1);
 	}
-
-	if (!has_exited) // If it hasn't exited yet, exit now -- killough
-	{
-		has_exited = 1; // Prevent infinitely recursive exits -- killough
-		exit(-1);
-	}
+	std::terminate();
 }
 
 void I_FatalError(const char* const error, ...)

src/posix/i_system.h

@@ -81,12 +81,6 @@ void I_StartTic (void);
 // for normal input.
 ticcmd_t *I_BaseTiccmd (void);
 
-
-// Called by M_Responder when quit is selected.
-// Clean exit, displays sell blurb.
-void I_Quit (void);
-
-
 void I_Tactile (int on, int off, int total);
 
 void I_DebugPrint (const char *cp);

src/posix/sdl/i_main.cpp

@@ -192,24 +192,7 @@ int main (int argc, char **argv)
     {
 		Args = new FArgs(argc, argv);
 
-		/*
-		  killough 1/98:
-
-		  This fixes some problems with exit handling
-		  during abnormal situations.
-
-		  The old code called I_Quit() to end program,
-		  while now I_Quit() is installed as an exit
-		  handler and exit() is called to exit, either
-		  normally or abnormally. Seg faults are caught
-		  and the error handler is used, to prevent
-		  being left in graphics mode or having very
-		  loud SFX noise because the sound card is
-		  left in an unstable state.
-		*/
-
 		atexit (call_terms);
-		atterm (I_Quit);
 
 		// Should we even be doing anything with progdir on Unix systems?
 		char program[PATH_MAX];

src/posix/sdl/i_system.cpp

@@ -102,22 +102,6 @@ void I_Init (void)
 	I_InitSound ();
 }
 
-//
-// I_Quit
-//
-static int has_exited;
-
-void I_Quit (void)
-{
-	has_exited = 1;		/* Prevent infinitely recursive exits -- killough */
-
-	if (demorecording)
-		G_CheckDemoStatus();
-
-	C_DeinitConsole();
-}
-
-
 //
 // I_Error
 //
@@ -189,12 +173,7 @@ void I_FatalError (const char *error, va_list ap)
 		fprintf (stderr, "%s\n", errortext);
 		exit (-1);
 	}
-
-	if (!has_exited)	// If it hasn't exited yet, exit now -- killough
-	{
-		has_exited = 1;	// Prevent infinitely recursive exits -- killough
-		exit(-1);
-	}
+	std::terminate();
 }
 
 void I_FatalError(const char* const error, ...)

src/utility/files_decompress.cpp

@@ -63,7 +63,7 @@ void DecompressorBase::DecompressionError(const char *error, ...) const
 	va_end(argptr);
 
 	if (ErrorCallback != nullptr) ErrorCallback(errortext);
-	else std::terminate();
+	else throw std::runtime_error(errortext);
 }
 
 long DecompressorBase::Tell () const

src/win32/i_main.cpp

@@ -749,6 +749,11 @@ void PeekThreadedErrorPane()
 	PeekMessage(&msg, 0, 0, 0, PM_NOREMOVE);
 }
 
+static void UnTbp()
+{
+	timeEndPeriod(TimerPeriod);
+}
+
 //==========================================================================
 //
 // DoMain
@@ -857,23 +862,10 @@ void DoMain (HINSTANCE hInstance)
 			TimerPeriod = tc.wPeriodMin;
 
 		timeBeginPeriod (TimerPeriod);
-
-		/*
-		killough 1/98:
-
-		This fixes some problems with exit handling
-		during abnormal situations.
-
-		The old code called I_Quit() to end program,
-		while now I_Quit() is installed as an exit
-		handler and exit() is called to exit, either
-		normally or abnormally.
-		*/
+		atexit(UnTbp);
 
 		atexit (call_terms);
 
-		atterm (I_Quit);
-
 		// Figure out what directory the program resides in.
 		WCHAR progbuff[1024];
 		if (GetModuleFileNameW(nullptr, progbuff, sizeof progbuff) == 0)

src/win32/i_system.cpp

@@ -143,7 +143,6 @@ int sys_ostype = 0;
 // PRIVATE DATA DEFINITIONS ------------------------------------------------
 
 static ticcmd_t emptycmd;
-static bool HasExited;
 
 static WadStuff *WadList;
 static int NumWads;
@@ -342,26 +341,6 @@ void I_Init()
 	I_InitSound ();
 }
 
-//==========================================================================
-//
-// I_Quit
-//
-//==========================================================================
-
-void I_Quit()
-{
-	HasExited = true;		/* Prevent infinitely recursive exits -- killough */
-
-	timeEndPeriod(TimerPeriod);
-
-	if (demorecording)
-	{
-		G_CheckDemoStatus();
-	}
-
-	C_DeinitConsole();
-}
-
 
 //==========================================================================
 //
@@ -395,12 +374,7 @@ void I_FatalError(const char *error, ...)
 
 		throw CFatalError(errortext);
 	}
-
-	if (!HasExited)		// If it hasn't exited yet, exit now -- killough
-	{
-		HasExited = 1;	// Prevent infinitely recursive exits -- killough
-		exit(-1);
-	}
+	std::terminate();
 }
 
 //==========================================================================