1 /* 2 * Copyright (c) 2024 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 SMART_FD_H 17 #define SMART_FD_H 18 19 #include <cstdint> 20 #include <unistd.h> 21 namespace OHOS { 22 namespace HiviewDFX { 23 class SmartFd { 24 public: SmartFd(int32_t fd)25 SmartFd(int32_t fd) : fd_(fd) {} 26 ~SmartFd()27 ~SmartFd() 28 { 29 if (fd_ >= 0) { 30 close(fd_); 31 } 32 } 33 34 SmartFd(const SmartFd&) = delete; 35 36 SmartFd &operator=(const SmartFd&) = delete; 37 SmartFd(SmartFd && rhs)38 SmartFd(SmartFd&& rhs) noexcept : fd_(rhs.fd_) 39 { 40 rhs.fd_ = -1; 41 } 42 43 SmartFd& operator=(SmartFd&& rhs) noexcept 44 { 45 if (this != &rhs) { 46 if (fd_ >= 0) { 47 close(fd_); 48 } 49 fd_ = rhs.fd_; 50 rhs.fd_ = -1; 51 } 52 return *this; 53 } 54 int32_t()55 operator int32_t() const 56 { 57 return fd_; 58 } 59 private: 60 int32_t fd_; 61 }; 62 } 63 } 64 #endif // SMART_FD_H 65