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 <optional>
26 #include <vector>
27 
28 #include <android-base/unique_fd.h>
29 
30 #include "result.h"
31 
32 namespace android {
33 namespace init {
34 
35 class Epoll {
36   public:
37     Epoll();
38 
39     Result<void> Open();
40     Result<void> RegisterHandler(int fd, std::function<void()> handler, uint32_t events = EPOLLIN);
41     Result<void> UnregisterHandler(int fd);
42     Result<std::vector<std::function<void()>*>> Wait(
43             std::optional<std::chrono::milliseconds> timeout);
44 
45   private:
46     android::base::unique_fd epoll_fd_;
47     std::map<int, std::function<void()>> epoll_handlers_;
48 };
49 
50 }  // namespace init
51 }  // namespace android
52