9e3ace52bb
Add new CgroupGetControllerFromPath function to retrieve the name of the cgroup using a file path. If the file does not belong to any cgroup, the function returns false. Bug: 191283136 Test: build and boot Signed-off-by: Suren Baghdasaryan <surenb@google.com> Change-Id: Ic17a474cb25a80a3339b33ed8bc27b07af053abb
73 lines
2 KiB
C++
73 lines
2 KiB
C++
/*
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* Copyright (C) 2019 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <sys/cdefs.h>
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#include <sys/types.h>
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#include <map>
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#include <memory>
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#include <mutex>
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#include <string>
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#include <vector>
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#include <android/cgrouprc.h>
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// Convenient wrapper of an ACgroupController pointer.
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class CgroupController {
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public:
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// Does not own controller
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explicit CgroupController(const ACgroupController* controller)
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: controller_(controller), state_(UNKNOWN) {}
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uint32_t version() const;
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const char* name() const;
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const char* path() const;
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bool HasValue() const;
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bool IsUsable();
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std::string GetTasksFilePath(const std::string& path) const;
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std::string GetProcsFilePath(const std::string& path, uid_t uid, pid_t pid) const;
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bool GetTaskGroup(int tid, std::string* group) const;
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private:
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enum ControllerState {
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UNKNOWN = 0,
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USABLE = 1,
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MISSING = 2,
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};
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const ACgroupController* controller_ = nullptr;
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ControllerState state_;
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};
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class CgroupMap {
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public:
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// Selinux policy ensures only init process can successfully use this function
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static bool SetupCgroups();
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static CgroupMap& GetInstance();
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CgroupController FindController(const std::string& name) const;
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CgroupController FindControllerByPath(const std::string& path) const;
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int ActivateControllers(const std::string& path) const;
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private:
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bool loaded_ = false;
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CgroupMap();
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bool LoadRcFile();
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void Print() const;
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};
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