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 #pragma once 17 18 #include <condition_variable> 19 #include <memory> 20 #include <thread> 21 #include <vector> 22 23 #include <netlink/msg.h> 24 25 namespace cvd { 26 constexpr int kWifiSimVersion = 1; 27 28 class Cmd { 29 public: 30 Cmd(); 31 explicit Cmd(nlmsghdr* h); 32 explicit Cmd(nl_msg* h); 33 ~Cmd(); 34 35 // Cmd() creates netlink request to be sent to kernel. 36 // Returns netlink message header structure. 37 nl_msg* Msg() const { return msg_; } 38 39 // Responses() holds execution until netlink responds to this message. 40 // Returns all netlink replies. 41 const std::vector<nl_msg*> Responses() const; 42 43 // OnResponse() handles data response from netlink. 44 // Returns value indicating 'done' state: 45 // - false, if more data is expected, or 46 // - true, if processing is complete and instance can be disposed of. 47 bool OnResponse(nl_msg* msg); 48 49 // Wait until message processing is complete. 50 void WaitComplete() const; 51 52 private: 53 nl_msg* msg_; 54 std::vector<nl_msg*> responses_; 55 56 mutable std::mutex ready_mutex_; 57 mutable std::condition_variable ready_signal_; 58 59 Cmd(const Cmd&) = delete; 60 Cmd& operator=(const Cmd&) = delete; 61 }; 62 63 } // namespace cvd 64
