/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef _INIT_UEVENT_LISTENER_H
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#define _INIT_UEVENT_LISTENER_H
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#include <dirent.h>
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#include <chrono>
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#include <functional>
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#include <optional>
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#include <android-base/unique_fd.h>
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#include "uevent.h"
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#define UEVENT_MSG_LEN 2048
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namespace android {
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namespace init {
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enum class ListenerAction {
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kStop = 0, // Stop regenerating uevents as we've handled the one(s) we're interested in.
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kContinue, // Continue regenerating uevents as we haven't seen the one(s) we're interested in.
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};
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using ListenerCallback = std::function<ListenerAction(const Uevent&)>;
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class UeventListener {
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public:
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UeventListener(size_t uevent_socket_rcvbuf_size);
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void RegenerateUevents(const ListenerCallback& callback) const;
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ListenerAction RegenerateUeventsForPath(const std::string& path,
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const ListenerCallback& callback) const;
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void Poll(const ListenerCallback& callback,
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const std::optional<std::chrono::milliseconds> relative_timeout = {}) const;
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private:
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bool ReadUevent(Uevent* uevent) const;
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ListenerAction RegenerateUeventsForDir(DIR* d, const ListenerCallback& callback) const;
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android::base::unique_fd device_fd_;
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};
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} // namespace init
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} // namespace android
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#endif
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