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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 <vector>
28 
29 #include <android-base/unique_fd.h>
30 
31 #include "result.h"
32 
33 namespace android {
34 namespace init {
35 
36 class Epoll {
37   public:
38     Epoll();
39 
40     typedef std::function<void()> Handler;
41 
42     Result<void> Open();
43     Result<void> RegisterHandler(int fd, Handler handler, uint32_t events = EPOLLIN);
44     Result<void> UnregisterHandler(int fd);
45     Result<std::vector<std::shared_ptr<Handler>>> Wait(
46             std::optional<std::chrono::milliseconds> timeout);
47 
48   private:
49     android::base::unique_fd epoll_fd_;
50     std::map<int, std::shared_ptr<Handler>> epoll_handlers_;
51 };
52 
53 }  // namespace init
54 }  // namespace android
55