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Merge 566d18c59e into 7f4e947447

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This commit is contained in:
sp3d 2014-02-11 04:15:13 +00:00
commit 043b006faf
1 changed files with 26 additions and 3 deletions
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27
src/x11_init.c
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@ -334,6 +334,16 @@ static Atom getSupportedAtom(Atom* supportedAtoms,
return None;
}
// X error handler and state variable needed to catch BadWindow in detectEWMH
//
static Bool handlerRan;
static int setFlagOnXError(Display* display, XErrorEvent* err)
{
handlerRan = True;
return 0;
}
// Check whether the running window manager is EWMH-compliant
//
static void detectEWMH(void)
@ -359,14 +369,27 @@ static void detectEWMH(void)
return;
}
// Since we don't trust that the window ID is valid, we set an error handler
// In order to ensure the handler runs immediately, also make XLib
// synchronous for the duration
handlerRan = False;
int (*oldHandler)(Display*, XErrorEvent*) = XSetErrorHandler(setFlagOnXError);
XSynchronize(_glfw.x11.display, True);
// It should be the ID of a child window (of the root)
// Then we look for the same property on the child window
if (_glfwGetWindowProperty(*windowFromRoot,
unsigned long windowCount = _glfwGetWindowProperty(*windowFromRoot,
supportingWmCheck,
XA_WINDOW,
(unsigned char**) &windowFromChild) != 1)
(unsigned char**) &windowFromChild);
XSetErrorHandler(oldHandler);
XSynchronize(_glfw.x11.display, False);
if (windowCount != 1 || handlerRan)
{
XFree(windowFromRoot);
if (!handlerRan)
XFree(windowFromChild);
return;
}