libprocessgroup: Add libcgrouprc am: 098323ba5b
am: 15c6496640
Change-Id: I2e6969425516c307275f94d21d8161999eebecd4
This commit is contained in:
commit
6dc78dc56f
6 changed files with 315 additions and 0 deletions
52
libprocessgroup/cgrouprc/Android.bp
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52
libprocessgroup/cgrouprc/Android.bp
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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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cc_library_shared {
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name: "libcgrouprc",
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host_supported: true,
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recovery_available: true,
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srcs: [
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"cgroup_controller.cpp",
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"cgroup_file.cpp",
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],
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cflags: [
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"-Wall",
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"-Werror",
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],
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export_include_dirs: [
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"include",
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],
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header_libs: [
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"libprocessgroup_headers",
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],
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shared_libs: [
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"libbase",
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],
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static_libs: [
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"libcgrouprc_format",
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],
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stubs: {
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symbol_file: "libcgrouprc.map.txt",
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versions: ["29"],
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},
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version_script: "libcgrouprc.map.txt",
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}
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llndk_library {
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name: "libcgrouprc",
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symbol_file: "libcgrouprc.map.txt",
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export_include_dirs: [
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"include",
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],
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}
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38
libprocessgroup/cgrouprc/cgroup_controller.cpp
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38
libprocessgroup/cgrouprc/cgroup_controller.cpp
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/*
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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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#include <android-base/logging.h>
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#include <android/cgrouprc.h>
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#include "cgrouprc_internal.h"
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// All ACgroupController_* functions implicitly convert the pointer back
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// to the original CgroupController pointer before invoking the member functions.
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uint32_t ACgroupController_getVersion(const ACgroupController* controller) {
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CHECK(controller != nullptr);
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return controller->version();
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}
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const char* ACgroupController_getName(const ACgroupController* controller) {
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CHECK(controller != nullptr);
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return controller->name();
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}
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const char* ACgroupController_getPath(const ACgroupController* controller) {
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CHECK(controller != nullptr);
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return controller->path();
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}
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106
libprocessgroup/cgrouprc/cgroup_file.cpp
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libprocessgroup/cgrouprc/cgroup_file.cpp
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/*
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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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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <memory>
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#include <android-base/logging.h>
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#include <android-base/stringprintf.h>
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#include <android-base/unique_fd.h>
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#include <android/cgrouprc.h>
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#include <processgroup/processgroup.h>
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#include "cgrouprc_internal.h"
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using android::base::StringPrintf;
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using android::base::unique_fd;
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using android::cgrouprc::format::CgroupController;
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using android::cgrouprc::format::CgroupFile;
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static CgroupFile* LoadRcFile() {
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struct stat sb;
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unique_fd fd(TEMP_FAILURE_RETRY(open(CGROUPS_RC_PATH, O_RDONLY | O_CLOEXEC)));
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if (fd < 0) {
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PLOG(ERROR) << "open() failed for " << CGROUPS_RC_PATH;
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return nullptr;
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}
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if (fstat(fd, &sb) < 0) {
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PLOG(ERROR) << "fstat() failed for " << CGROUPS_RC_PATH;
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return nullptr;
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}
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size_t file_size = sb.st_size;
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if (file_size < sizeof(CgroupFile)) {
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LOG(ERROR) << "Invalid file format " << CGROUPS_RC_PATH;
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return nullptr;
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}
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CgroupFile* file_data = (CgroupFile*)mmap(nullptr, file_size, PROT_READ, MAP_SHARED, fd, 0);
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if (file_data == MAP_FAILED) {
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PLOG(ERROR) << "Failed to mmap " << CGROUPS_RC_PATH;
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return nullptr;
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}
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if (file_data->version_ != CgroupFile::FILE_CURR_VERSION) {
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LOG(ERROR) << CGROUPS_RC_PATH << " file version mismatch";
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munmap(file_data, file_size);
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return nullptr;
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}
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auto expected = sizeof(CgroupFile) + file_data->controller_count_ * sizeof(CgroupController);
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if (file_size != expected) {
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LOG(ERROR) << CGROUPS_RC_PATH << " file has invalid size, expected " << expected
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<< ", actual " << file_size;
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munmap(file_data, file_size);
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return nullptr;
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}
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return file_data;
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}
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static CgroupFile* GetInstance() {
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// Deliberately leak this object (not munmap) to avoid a race between destruction on
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// process exit and concurrent access from another thread.
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static auto* file = LoadRcFile();
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return file;
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}
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uint32_t ACgroupFile_getVersion() {
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auto file = GetInstance();
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if (file == nullptr) return 0;
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return file->version_;
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}
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uint32_t ACgroupFile_getControllerCount() {
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auto file = GetInstance();
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if (file == nullptr) return 0;
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return file->controller_count_;
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}
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const ACgroupController* ACgroupFile_getController(uint32_t index) {
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auto file = GetInstance();
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if (file == nullptr) return nullptr;
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CHECK(index < file->controller_count_);
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// Although the object is not actually an ACgroupController object, all ACgroupController_*
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// functions implicitly convert ACgroupController* back to CgroupController* before invoking
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// member functions.
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return static_cast<ACgroupController*>(&file->controllers_[index]);
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}
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24
libprocessgroup/cgrouprc/cgrouprc_internal.h
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24
libprocessgroup/cgrouprc/cgrouprc_internal.h
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/*
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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 <android/cgrouprc.h>
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#include <processgroup/format/cgroup_controller.h>
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#include <processgroup/format/cgroup_file.h>
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struct ACgroupController : android::cgrouprc::format::CgroupController {};
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84
libprocessgroup/cgrouprc/include/android/cgrouprc.h
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84
libprocessgroup/cgrouprc/include/android/cgrouprc.h
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/*
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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 <stdint.h>
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__BEGIN_DECLS
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// For host builds, __INTRODUCED_IN is not defined.
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#ifndef __INTRODUCED_IN
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#define __INTRODUCED_IN(x)
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#endif
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struct ACgroupController;
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typedef struct ACgroupController ACgroupController;
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#if __ANDROID_API__ >= __ANDROID_API_Q__
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// ACgroupFile
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/**
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* Returns file version. See android::cgrouprc::format::CgroupFile for a list of valid versions
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* for the file.
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* If ACgroupFile_init() isn't called, initialization will be done first.
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* If initialization failed, return 0.
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*/
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__attribute__((warn_unused_result)) uint32_t ACgroupFile_getVersion() __INTRODUCED_IN(29);
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/**
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* Returns the number of controllers.
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* If ACgroupFile_init() isn't called, initialization will be done first.
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* If initialization failed, return 0.
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*/
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__attribute__((warn_unused_result)) uint32_t ACgroupFile_getControllerCount() __INTRODUCED_IN(29);
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/**
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* Returns the controller at the given index.
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* Returnss nullptr if the given index exceeds getControllerCount().
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* If ACgroupFile_init() isn't called, initialization will be done first.
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* If initialization failed, return 0.
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*/
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__attribute__((warn_unused_result)) const ACgroupController* ACgroupFile_getController(
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uint32_t index) __INTRODUCED_IN(29);
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// ACgroupController
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/**
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* Returns the version of the given controller.
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* If the given controller is null, return 0.
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*/
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__attribute__((warn_unused_result)) uint32_t ACgroupController_getVersion(const ACgroupController*)
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__INTRODUCED_IN(29);
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/**
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* Returns the name of the given controller.
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* If the given controller is null, return nullptr.
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*/
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__attribute__((warn_unused_result)) const char* ACgroupController_getName(const ACgroupController*)
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__INTRODUCED_IN(29);
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/**
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* Returns the path of the given controller.
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* If the given controller is null, return nullptr.
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*/
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__attribute__((warn_unused_result)) const char* ACgroupController_getPath(const ACgroupController*)
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__INTRODUCED_IN(29);
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__END_DECLS
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#endif
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11
libprocessgroup/cgrouprc/libcgrouprc.map.txt
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11
libprocessgroup/cgrouprc/libcgrouprc.map.txt
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LIBCGROUPRC { # introduced=29
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global:
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ACgroupFile_getVersion;
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ACgroupFile_getControllerCount;
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ACgroupFile_getController;
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ACgroupController_getVersion;
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ACgroupController_getName;
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ACgroupController_getPath;
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local:
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*;
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};
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