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Commit f4212744 authored by Yifan Hong's avatar Yifan Hong
Browse files

libprocessgroup: Add libcgrouprc_format 

This module defines the wire format of the mmap()ed cgroup.rc
file.

Test: builds
Bug: 123664216

Change-Id: Iaf6199f759a6264590b13ca7ba6d7f576c3ed56a
parent cc563077

libprocessgroup/cgrouprc_format/Android.bp

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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.



cc_library_static {

    name: "libcgrouprc_format",

    host_supported: true,

    recovery_available: true,

    srcs: [

        "cgroup_controller.cpp",

    ],

    cflags: [

        "-Wall",

        "-Werror",

    ],

    export_include_dirs: [

        "include",

    ],

    shared_libs: [

        "libbase",

    ],

}

libprocessgroup/cgrouprc_format/cgroup_controller.cpp

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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.

 */



#include <processgroup/format/cgroup_controller.h>



namespace android {

namespace cgrouprc {

namespace format {



CgroupController::CgroupController(uint32_t version, const std::string& name,

                                   const std::string& path) {

    // strlcpy isn't available on host. Although there is an implementation

    // in licutils, libcutils itself depends on libcgrouprc_format, causing

    // a circular dependency.

    version_ = version;

    strncpy(name_, name.c_str(), sizeof(name_) - 1);

    name_[sizeof(name_) - 1] = '\0';

    strncpy(path_, path.c_str(), sizeof(path_) - 1);

    path_[sizeof(path_) - 1] = '\0';

}



uint32_t CgroupController::version() const {

    return version_;

}



const char* CgroupController::name() const {

    return name_;

}



const char* CgroupController::path() const {

    return path_;

}



}  // namespace format

}  // namespace cgrouprc

}  // namespace android

libprocessgroup/cgrouprc_format/include/processgroup/format/cgroup_controller.h

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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 <stdint.h>

#include <string>



namespace android {

namespace cgrouprc {

namespace format {



// Minimal controller description to be mmapped into process address space

struct CgroupController {

  public:

    CgroupController() {}

    CgroupController(uint32_t version, const std::string& name, const std::string& path);



    uint32_t version() const;

    const char* name() const;

    const char* path() 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];

};



}  // namespace format

}  // namespace cgrouprc

}  // namespace android

libprocessgroup/cgrouprc_format/include/processgroup/format/cgroup_file.h

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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 <processgroup/format/cgroup_controller.h>



namespace android {

namespace cgrouprc {

namespace format {



struct CgroupFile {

    uint32_t version_;

    uint32_t controller_count_;

    CgroupController controllers_[];



    static constexpr uint32_t FILE_VERSION_1 = 1;

    static constexpr uint32_t FILE_CURR_VERSION = FILE_VERSION_1;

};



}  // namespace format

}  // namespace cgrouprc

}  // namespace android