ui/gfx/x/x11_error_tracker.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef UI_GFX_X_X11_ERROR_TRACKER_H_
   6 #define UI_GFX_X_X11_ERROR_TRACKER_H_
   7
   8 #include <X11/Xlib.h>
   9
  10 #include "base/basictypes.h"
  11 #include "ui/gfx/gfx_export.h"
  12
  13 namespace gfx {
  14
  15 // X11ErrorTracker catches X11 errors in a non-fatal way. It does so by
  16 // temporarily changing the X11 error handler. The old error handler is
  17 // restored when the tracker is destroyed.
  18 class GFX_EXPORT X11ErrorTracker {
  19  public:
  20   X11ErrorTracker();
  21   ~X11ErrorTracker();
  22
  23   // Returns whether an X11 error happened since this function was last called
  24   // (or since the creation of the tracker). This is potentially expensive,
  25   // since this causes a sync with the X server.
  26   bool FoundNewError();
  27
  28  private:
  29   XErrorHandler old_handler_;
  30
  31   DISALLOW_COPY_AND_ASSIGN(X11ErrorTracker);
  32 };
  33
  34 }  // namespace gfx
  35
  36 #endif  // UI_GFX_X_X11_ERROR_TRACKER_H_