On Thu, 2012-06-14 at 13:52 +0100, Myrosia Dzikovska wrote: > Hi, > > I have a program using an X graphics library that works on FC 13 and > ScientificLinux 6, but freezes on OpenSuse 12.1. I need to get it > running, and I am trying to determine the cause of failure. I'm not an > X developer, and because the library is complex, I am struggling to > come up with a minimal example. > > The specific cause of the problem is the call in the code: > XSetStandardProperties(win->theDisp, win->theWindow, wname, hgraf, > None, NULL, 0, &(win->hints)); > > I verified by putting print statements around it that it never > returns, the program freezes there. > > The initialization code is complex, but the best I can tell it boils down to > char *hgraf = "HGraf"; > win->theDisp = XOpenDisplay(0) > win->theScreen=DefaultScreen(win->theDisp); > win->rootW=RootWindow(win->theDisp, win->theScreen); > win->theWindow = XCreateSimpleWindow(win->theDisp, win->rootW, x, y, > w, h, bw, black, white ); > > > I am at a loss as to what I should be checking here, and what could > cause the program to hang at that XSetStandardProperties call, with no > error messages or exceptions. How can I debug this?
I would probably start by calling XSynchronize(dpy, 1) just after XOpenDisplay, to see if that changes where the hang happens. Another strategy would be to compare the generated X protocol between the OSes that work and the ones that don't. You can use wireshark for this if you set DISPLAY=localhost:0 (and didn't start your X server with -nolisten tcp); alternatively, there's xscope(1). Are you using the same window manager across all systems? If not, that's a pretty likely place to start looking. - ajax
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