1 /* 2 * Copyright (C) 2022 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef ART_LIBARTBASE_BASE_SCOPED_CAP_H_ 18 #define ART_LIBARTBASE_BASE_SCOPED_CAP_H_ 19 20 #include <sys/capability.h> 21 22 #include <utility> 23 24 #include "android-base/logging.h" 25 26 namespace art { 27 28 // A wrapper of `cap_t` that automatically calls `cap_free`. 29 class ScopedCap { 30 public: ScopedCap(cap_t cap)31 explicit ScopedCap(cap_t cap) : cap_(cap) {} 32 33 ScopedCap(const ScopedCap&) = delete; 34 ScopedCap& operator=(const ScopedCap&) = delete; ScopedCap(ScopedCap && other)35 ScopedCap(ScopedCap&& other) noexcept : cap_(std::exchange(other.cap_, nullptr)) {} 36 ~ScopedCap()37 ~ScopedCap() { 38 if (cap_ != nullptr) { 39 if (cap_free(cap_) != 0) { 40 PLOG(ERROR) << "Failed to call cap_free"; 41 } 42 } 43 } 44 Get()45 cap_t Get() const { return cap_; } 46 47 private: 48 cap_t cap_; 49 }; 50 51 } // namespace art 52 53 #endif // ART_LIBARTBASE_BASE_SCOPED_CAP_H_ 54