Implemented the quitting logic on OS X. Now I can get rid of darwin/main.m and move darwin/init.m in its place.

darwin/init.m

@@ -17,15 +17,27 @@ static BOOL canQuit = NO;
 	// yes that's right folks: DO ABSOLUTELY NOTHING.
 	// the magic is [NSApp run] will just... stop.
 
+	// well let's not do nothing; let's actually quit our graceful way
+	NSEvent *e;
+
 	// for debugging
 	NSLog(@"in terminate:");
 
 	if (!canQuit)
 		complain("call to [NSApp terminate:] when not ready to terminate");
 
-	// TODO move the body of uiQuit() here
+	[NSApp stop:NSApp];
-	// TODO make uiQuit() just call terminate:
+	// stop: won't register until another event has passed; let's synthesize one
-	// TODO update the above comment
+	e = [NSEvent otherEventWithType:NSApplicationDefined
+		location:NSZeroPoint
+		modifierFlags:0
+		timestamp:[[NSProcessInfo processInfo] systemUptime]
+		windowNumber:0
+		context:[NSGraphicsContext currentContext]
+		subtype:0
+		data1:0
+		data2:0];
+	[NSApp postEvent:e atStart:NO];		// let pending events take priority (this is what PostQuitMessage() on Windows does so we have to do it here too for parity; thanks to mikeash in irc.freenode.net/#macdev for confirming that this parameter should indeed be NO)
 }
 
 @end
@@ -88,3 +100,14 @@ void uiUninit(void)
 void uiFreeInitError(const char *err)
 {
 }
+
+void uiMain(void)
+{
+	[NSApp run];
+}
+
+void uiQuit(void)
+{
+	canQuit = YES;
+	[NSApp terminate:NSApp];
+}

darwin/main.m

@@ -1,25 +1,2 @@
 // 6 april 2015
 #import "uipriv_darwin.h"
-
-void uiMain(void)
-{
-	[NSApp run];
-}
-
-void uiQuit(void)
-{
-	NSEvent *e;
-
-	[NSApp stop:NSApp];
-	// stop: won't register until another event has passed; let's synthesize one
-	e = [NSEvent otherEventWithType:NSApplicationDefined
-		location:NSZeroPoint
-		modifierFlags:0
-		timestamp:[[NSProcessInfo processInfo] systemUptime]
-		windowNumber:0
-		context:[NSGraphicsContext currentContext]
-		subtype:0
-		data1:0
-		data2:0];
-	[NSApp postEvent:e atStart:NO];		// let pending events take priority (this is what PostQuitMessage() on Windows does so we have to do it here too for parity; thanks to mikeash in irc.freenode.net/#macdev for confirming that this parameter should indeed be NO)
-}

test/main.c

@@ -23,6 +23,7 @@ int onClosing(uiWindow *w, void *data)
 int onShouldQuit(void *data)
 {
 	printf("in onShouldQuit()\n");
+	uiControlDestroy(uiControl(data));
 	return uiMenuItemChecked(shouldQuitItem);
 }
 
@@ -57,12 +58,12 @@ int main(int argc, char *argv[])
 	if (!nomenus)
 		initMenus();
 
-	uiOnShouldQuit(onShouldQuit, NULL);
-
 	w = newWindow("Main Window", 320, 240, 1);
 	uiWindowOnClosing(w, onClosing, NULL);
 	printf("main window %p\n", w);
 
+	uiOnShouldQuit(onShouldQuit, w);
+
 	mainBox = newHorizontalBox();
 	uiWindowSetChild(w, uiControl(mainBox));