1 /* 2 * Copyright (C) 2018 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 <stdint.h> 20 #include <sys/epoll.h> 21 22 #include <chrono> 23 #include <functional> 24 #include <map> 25 #include <memory> 26 #include <optional> 27 #include <unordered_set> 28 #include <vector> 29 30 #include <android-base/unique_fd.h> 31 32 #include "result.h" 33 34 namespace android { 35 namespace init { 36 37 class Epoll { 38 public: 39 Epoll(); 40 41 typedef std::function<void()> Handler; 42 43 Result<void> Open(); 44 Result<void> RegisterHandler(int fd, Handler handler, uint32_t events = EPOLLIN); 45 Result<void> UnregisterHandler(int fd); 46 void SetFirstCallback(std::function<void()> first_callback); 47 Result<int> Wait(std::optional<std::chrono::milliseconds> timeout); 48 49 private: 50 struct Info { 51 Handler handler; 52 uint32_t events; 53 }; 54 55 android::base::unique_fd epoll_fd_; 56 std::map<int, Info> epoll_handlers_; 57 std::function<void()> first_callback_; 58 std::unordered_set<int> to_remove_; 59 }; 60 61 } // namespace init 62 } // namespace android 63