d71d30179c
Cannot really do calls if initialization failed. Also fix LOG usage. But: 124774415 Test: Build Change-Id: Ifd7db90cfee51ba5830e1d4db8f8d19b5bc9feba
96 lines
2.8 KiB
C++
96 lines
2.8 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 <mutex>
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#include <string>
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// Minimal controller description to be mmapped into process address space
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class CgroupController {
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public:
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CgroupController() {}
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CgroupController(uint32_t version, const std::string& name, const std::string& path);
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uint32_t version() const { return version_; }
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const char* name() const { return name_; }
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const char* path() const { return path_; }
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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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static constexpr size_t CGROUP_NAME_BUF_SZ = 16;
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static constexpr size_t CGROUP_PATH_BUF_SZ = 32;
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uint32_t version_;
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char name_[CGROUP_NAME_BUF_SZ];
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char path_[CGROUP_PATH_BUF_SZ];
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};
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// Complete controller description for mounting cgroups
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class CgroupDescriptor {
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public:
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CgroupDescriptor(uint32_t version, const std::string& name, const std::string& path,
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mode_t mode, const std::string& uid, const std::string& gid);
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const CgroupController* controller() const { return &controller_; }
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mode_t mode() const { return mode_; }
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std::string uid() const { return uid_; }
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std::string gid() const { return gid_; }
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private:
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CgroupController controller_;
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mode_t mode_;
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std::string uid_;
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std::string gid_;
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};
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struct CgroupFile {
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static constexpr uint32_t FILE_VERSION_1 = 1;
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static constexpr uint32_t FILE_CURR_VERSION = FILE_VERSION_1;
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uint32_t version_;
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uint32_t controller_count_;
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CgroupController controllers_[];
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};
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class CgroupMap {
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public:
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static constexpr const char* CGROUPS_RC_FILE = "cgroup.rc";
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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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const CgroupController* FindController(const std::string& name) const;
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private:
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struct CgroupFile* cg_file_data_;
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size_t cg_file_size_;
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CgroupMap();
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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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