Re: mac - crash when scrolling wheely mouse when all frames are minimized

[Andrew Choi <akochoi@shaw.ca>]

jpw@shootybangbang.com (John Paul Wallington) writes:

> On Mac OS X.1.5, minimizing all frames (but ensuring that Emacs has the
> focus; the global menubar is Emacs') then scrolling the mouse wheel
> causes a crash:
> 
> Program received signal EXC_BAD_ACCESS, Could not access memory.
> 0x0013d2dc in XTread_socket (sd=0, bufp=0xbffd11c8, numchars=2407900, expected=-1073934024) at macterm.c:12660
> 12660                   XSETFRAME (bufp->frame_or_window, mwp->mFP);

I don't use a wheel mouse so I can't test this.  But please try adding
the following lines:

	  if (!IsValidWindowPtr (window_ptr))
	    {
	      SysBeep (1);
	      UNBLOCK_INPUT;
	      return 0;
	    }

in macterm.c (XTread_socket):

  	  case kEventClassMouse:
	    if (GetEventKind (eventRef) == kEventMouseWheelMoved) 
	      {
		SInt32 delta;
		Point point;
		WindowPtr window_ptr = FrontNonFloatingWindow ();
		struct mac_output *mwp = (mac_output *) GetWRefCon (window_ptr);
                <=== add the code here

		GetEventParameter(eventRef, kEventParamMouseWheelDelta,
				  typeSInt32, NULL, sizeof (SInt32),
				  NULL, &delta);