| // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef REMOTING_HOST_LINUX_X11_UTIL_H_ |
| #define REMOTING_HOST_LINUX_X11_UTIL_H_ |
| |
| // Xlib.h defines XErrorEvent as an anonymous struct, so we can't forward- |
| // declare it in this header. Since Xlib.h is not generally something you |
| // should #include into arbitrary code, please refrain from #including this |
| // header in another header. |
| #include <X11/Xlib.h> |
| |
| #include "base/callback.h" |
| |
| namespace remoting { |
| |
| // Temporarily install an alternative handler for X errors. The default handler |
| // exits the process, which is not what we want. |
| // |
| // Note that X error handlers are global, which means that this class is not |
| // thread safe. |
| class ScopedXErrorHandler { |
| public: |
| typedef base::Callback<void(Display*, XErrorEvent*)> Handler; |
| |
| explicit ScopedXErrorHandler(const Handler& handler); |
| ~ScopedXErrorHandler(); |
| |
| // Return false if any X errors have been encountered in the scope of this |
| // handler. |
| bool ok() const { return ok_; } |
| |
| // Basic handler that ignores X errors. |
| static Handler Ignore(); |
| |
| private: |
| static int HandleXErrors(Display* display, XErrorEvent* error); |
| |
| Handler handler_; |
| int (*previous_handler_)(Display*, XErrorEvent*); |
| bool ok_; |
| |
| DISALLOW_COPY_AND_ASSIGN(ScopedXErrorHandler); |
| }; |
| |
| |
| // Grab/release the X server within a scope. This can help avoid race |
| // conditions that would otherwise lead to X errors. |
| class ScopedXGrabServer { |
| public: |
| ScopedXGrabServer(Display* display); |
| ~ScopedXGrabServer(); |
| |
| private: |
| Display* display_; |
| |
| DISALLOW_COPY_AND_ASSIGN(ScopedXGrabServer); |
| }; |
| |
| } // namespace remoting |
| |
| #endif // REMOTING_HOST_LINUX_X11_UTIL_H_ |