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/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef _INIT_UEVENT_LISTENER_H
#define _INIT_UEVENT_LISTENER_H
#include <dirent.h>
#include <chrono>
#include <functional>
#include <optional>
#include <android-base/unique_fd.h>
#include "uevent.h"
#define UEVENT_MSG_LEN 8192
namespace android {
namespace init {
enum class ListenerAction {
kStop = 0, // Stop regenerating uevents as we've handled the one(s) we're interested in.
kContinue, // Continue regenerating uevents as we haven't seen the one(s) we're interested in.
};
enum class ReadUeventResult {
kSuccess = 0, // Uevent was successfully read.
kFailed, // Uevent reading has failed.
kInvalid, // An Invalid Uevent was read (like say, the msg received is >= UEVENT_MSG_LEN).
};
using ListenerCallback = std::function<ListenerAction(const Uevent&)>;
class UeventListener {
public:
UeventListener(size_t uevent_socket_rcvbuf_size);
void RegenerateUevents(const ListenerCallback& callback) const;
ListenerAction RegenerateUeventsForPath(const std::string& path,
const ListenerCallback& callback) const;
void Poll(const ListenerCallback& callback,
const std::optional<std::chrono::milliseconds> relative_timeout = {}) const;
private:
ReadUeventResult ReadUevent(Uevent* uevent) const;
ListenerAction RegenerateUeventsForDir(DIR* d, const ListenerCallback& callback) const;
android::base::unique_fd device_fd_;
};
} // namespace init
} // namespace android
#endif