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79fa9765ca
We now use AK::Error and AK::ErrorOr<T> in both kernel and userspace! This was a slightly tedious refactoring that took a long time, so it's not unlikely that some bugs crept in. Nevertheless, it does pass basic functionality testing, and it's just real nice to finally see the same pattern in all contexts. :^)
83 lines
2.6 KiB
C++
83 lines
2.6 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2021, sin-ack <sin-ack@protonmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Badge.h>
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#include <AK/Checked.h>
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#include <AK/CircularQueue.h>
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#include <AK/HashMap.h>
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#include <AK/NonnullOwnPtr.h>
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#include <Kernel/API/InodeWatcherEvent.h>
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#include <Kernel/FileSystem/File.h>
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#include <Kernel/Forward.h>
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namespace Kernel {
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// A specific description of a watch.
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struct WatchDescription {
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int wd;
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Inode& inode;
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unsigned event_mask;
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static ErrorOr<NonnullOwnPtr<WatchDescription>> create(int wd, Inode& inode, unsigned event_mask)
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{
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return adopt_nonnull_own_or_enomem(new (nothrow) WatchDescription(wd, inode, event_mask));
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}
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private:
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WatchDescription(int wd, Inode& inode, unsigned event_mask)
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: wd(wd)
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, inode(inode)
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, event_mask(event_mask)
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{
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}
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};
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class InodeWatcher final : public File {
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public:
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static ErrorOr<NonnullRefPtr<InodeWatcher>> try_create();
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virtual ~InodeWatcher() override;
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virtual bool can_read(const OpenFileDescription&, size_t) const override;
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virtual ErrorOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) override;
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// Can't write to an inode watcher.
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virtual bool can_write(const OpenFileDescription&, size_t) const override { return true; }
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virtual ErrorOr<size_t> write(OpenFileDescription&, u64, const UserOrKernelBuffer&, size_t) override { return EIO; }
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virtual ErrorOr<void> close() override;
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virtual ErrorOr<NonnullOwnPtr<KString>> pseudo_path(const OpenFileDescription&) const override;
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virtual StringView class_name() const override { return "InodeWatcher"sv; };
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virtual bool is_inode_watcher() const override { return true; }
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void notify_inode_event(Badge<Inode>, InodeIdentifier, InodeWatcherEvent::Type, String const& name = {});
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ErrorOr<int> register_inode(Inode&, unsigned event_mask);
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ErrorOr<void> unregister_by_wd(int);
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void unregister_by_inode(Badge<Inode>, InodeIdentifier);
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private:
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explicit InodeWatcher() { }
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mutable Mutex m_lock;
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struct Event {
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int wd { 0 };
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InodeWatcherEvent::Type type { InodeWatcherEvent::Type::Invalid };
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String path;
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};
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CircularQueue<Event, 32> m_queue;
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Checked<int> m_wd_counter { 1 };
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// NOTE: These two hashmaps provide two different ways of reaching the same
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// watch description, so they will overlap.
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HashMap<int, NonnullOwnPtr<WatchDescription>> m_wd_to_watches;
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HashMap<InodeIdentifier, WatchDescription*> m_inode_to_watches;
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};
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}
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