1 /* 2 * Copyright (c) 2013 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #ifndef MODULES_DESKTOP_CAPTURE_LINUX_X11_X_ERROR_TRAP_H_ 12 #define MODULES_DESKTOP_CAPTURE_LINUX_X11_X_ERROR_TRAP_H_ 13 14 #include <X11/Xlib.h> 15 16 #include "rtc_base/synchronization/mutex.h" 17 18 namespace webrtc { 19 20 // Helper class that registers an X Window error handler. Caller can use 21 // GetLastErrorAndDisable() to get the last error that was caught, if any. 22 class XErrorTrap { 23 public: 24 explicit XErrorTrap(Display* display); 25 26 XErrorTrap(const XErrorTrap&) = delete; 27 XErrorTrap& operator=(const XErrorTrap&) = delete; 28 29 ~XErrorTrap(); 30 31 // Returns the last error if one was caught, otherwise 0. Also unregisters the 32 // error handler and replaces it with `original_error_handler_`. 33 int GetLastErrorAndDisable(); 34 35 private: 36 MutexLock mutex_lock_; 37 XErrorHandler original_error_handler_ = nullptr; 38 }; 39 40 } // namespace webrtc 41 42 #endif // MODULES_DESKTOP_CAPTURE_LINUX_X11_X_ERROR_TRAP_H_ 43