1 /* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #pragma once 18 19 #include <atomic> 20 #include <functional> 21 #include <mutex> 22 #include <stdint.h> 23 #include <unordered_map> 24 25 class NetlinkMessage; 26 27 class Netlink { 28 public: 29 using ReplyHandler = std::function<void (const NetlinkMessage&)>; 30 using StopHandler = std::function<void ()>; 31 Netlink(); 32 ~Netlink(); 33 34 bool init(); 35 void stop(StopHandler stopHandler); 36 37 bool eventLoop(); 38 39 uint32_t getSequenceNumber(); 40 41 bool sendMessage(const NetlinkMessage& message, ReplyHandler handler); 42 private: 43 Netlink(const Netlink&) = delete; 44 Netlink& operator=(const Netlink&) = delete; 45 46 bool readNetlinkMessage(int fd); 47 bool readControlMessage(); 48 49 void notifyHandler(const char* data, size_t size); 50 51 std::atomic<uint32_t> mNextSequenceNumber; 52 int mSocket; 53 int mControlPipe[2]; 54 // Map sequence number to reply handler 55 std::unordered_map<uint32_t, ReplyHandler> mHandlers; 56 std::mutex mHandlersMutex; 57 std::mutex mStopHandlerMutex; 58 StopHandler mStopHandler; 59 }; 60 61
