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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <AK/Badge.h>
#include <AK/CircularQueue.h>
#include <AK/WeakPtr.h>
#include <Kernel/FileSystem/File.h>
#include <Kernel/Lock.h>
namespace Kernel {
class Inode;
class InodeWatcher final : public File {
public:
static NonnullRefPtr<InodeWatcher> create(Inode&);
virtual ~InodeWatcher() override;
struct Event {
enum class Type {
Invalid = 0,
Modified,
ChildAdded,
ChildRemoved,
};
Type type { Type::Invalid };
unsigned inode_index { 0 };
};
virtual bool can_read(const FileDescription&, size_t) const override;
virtual bool can_write(const FileDescription&, size_t) const override;
virtual KResultOr<size_t> read(FileDescription&, size_t, UserOrKernelBuffer&, size_t) override;
virtual KResultOr<size_t> write(FileDescription&, size_t, const UserOrKernelBuffer&, size_t) override;
virtual String absolute_path(const FileDescription&) const override;
virtual const char* class_name() const override { return "InodeWatcher"; };
void notify_inode_event(Badge<Inode>, Event::Type);
void notify_child_added(Badge<Inode>, const InodeIdentifier& child_id);
void notify_child_removed(Badge<Inode>, const InodeIdentifier& child_id);
private:
explicit InodeWatcher(Inode&);
Lock m_lock;
WeakPtr<Inode> m_inode;
CircularQueue<Event, 32> m_queue;
};
}
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