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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/cdefs.h>
#include <sys/types.h>
#include <map>
#include <mutex>
#include <string>
// Minimal controller description to be mmapped into process address space
class CgroupController {
public:
CgroupController() {}
CgroupController(uint32_t version, const std::string& name, const std::string& path);
uint32_t version() const { return version_; }
const char* name() const { return name_; }
const char* path() const { return path_; }
std::string GetTasksFilePath(const std::string& path) const;
std::string GetProcsFilePath(const std::string& path, uid_t uid, pid_t pid) const;
bool GetTaskGroup(int tid, std::string* group) const;
private:
static constexpr size_t CGROUP_NAME_BUF_SZ = 16;
static constexpr size_t CGROUP_PATH_BUF_SZ = 32;
uint32_t version_;
char name_[CGROUP_NAME_BUF_SZ];
char path_[CGROUP_PATH_BUF_SZ];
};
// Complete controller description for mounting cgroups
class CgroupDescriptor {
public:
CgroupDescriptor(uint32_t version, const std::string& name, const std::string& path,
mode_t mode, const std::string& uid, const std::string& gid);
const CgroupController* controller() const { return &controller_; }
mode_t mode() const { return mode_; }
std::string uid() const { return uid_; }
std::string gid() const { return gid_; }
private:
CgroupController controller_;
mode_t mode_;
std::string uid_;
std::string gid_;
};
struct CgroupFile {
static constexpr uint32_t FILE_VERSION_1 = 1;
static constexpr uint32_t FILE_CURR_VERSION = FILE_VERSION_1;
uint32_t version_;
uint32_t controller_count_;
CgroupController controllers_[];
};
class CgroupMap {
public:
// Selinux policy ensures only init process can successfully use this function
static bool SetupCgroups();
static CgroupMap& GetInstance();
const CgroupController* FindController(const std::string& name) const;
private:
struct CgroupFile* cg_file_data_;
size_t cg_file_size_;
CgroupMap();
~CgroupMap();
bool LoadRcFile();
void Print() const;
};
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