1 /* 2 * Copyright (C) 2019 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 #pragma once 18 19 #include <sys/types.h> 20 21 #include <cstdint> 22 #include <string> 23 24 #include <processgroup/cgroup_controller.h> 25 #include <processgroup/util.h> 26 27 // Convenient wrapper of a CgroupController pointer. 28 class CgroupControllerWrapper { 29 public: 30 // Does not own controller CgroupControllerWrapper(const CgroupController * controller)31 explicit CgroupControllerWrapper(const CgroupController* controller) 32 : controller_(controller) {} 33 34 uint32_t version() const; 35 const char* name() const; 36 const char* path() const; 37 38 bool HasValue() const; 39 bool IsUsable(); 40 41 std::string GetTasksFilePath(const std::string& path) const; 42 std::string GetProcsFilePath(const std::string& path, uid_t uid, pid_t pid) const; 43 bool GetTaskGroup(pid_t tid, std::string* group) const; 44 45 private: 46 enum ControllerState { 47 UNKNOWN = 0, 48 USABLE = 1, 49 MISSING = 2, 50 }; 51 52 const CgroupController* controller_ = nullptr; // CgroupMap owns the object behind this pointer 53 ControllerState state_ = ControllerState::UNKNOWN; 54 }; 55 56 class CgroupMap { 57 public: 58 static CgroupMap& GetInstance(); 59 CgroupControllerWrapper FindController(const std::string& name) const; 60 CgroupControllerWrapper FindControllerByPath(const std::string& path) const; 61 bool ActivateControllers(const std::string& path) const; 62 63 private: 64 bool loaded_ = false; 65 CgroupDescriptorMap descriptors_; 66 CgroupMap(); 67 bool LoadDescriptors(); 68 void Print() const; 69 }; 70