1 /* 2 * Copyright (c) 2023 Huawei Device Co., Ltd. 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 16 #ifndef PREFERENCES_FILE_LOCK_H 17 #define PREFERENCES_FILE_LOCK_H 18 19 #include <chrono> 20 #include <string> 21 #include "preferences_errno.h" 22 namespace OHOS { 23 namespace NativePreferences { 24 class PreferencesFileLock final { 25 public: 26 PreferencesFileLock(); 27 ~PreferencesFileLock(); 28 int TryLock(const std::string &fileName); 29 int UnLock(); 30 private: 31 int fd_{ -1 }; 32 }; 33 } // namespace NativePreferences 34 } // namespace OHOS 35 #endif