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