mirror of
https://github.com/RGBCube/serenity
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f820917a76
This commit converts naked `new`s to `AK::try_make` and `AK::try_create` wherever possible. If the called constructor is private, this can not be done, so we instead now use the standard-defined and compiler-agnostic `new (nothrow)`.
86 lines
2.6 KiB
C++
86 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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namespace Kernel {
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class Inode;
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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 KResultOr<NonnullOwnPtr<WatchDescription>> create(int wd, Inode& inode, unsigned event_mask)
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{
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auto description = adopt_own_if_nonnull(new (nothrow) WatchDescription(wd, inode, event_mask));
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if (description)
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return description.release_nonnull();
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return ENOMEM;
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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 KResultOr<NonnullRefPtr<InodeWatcher>> create();
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virtual ~InodeWatcher() override;
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virtual bool can_read(const FileDescription&, size_t) const override;
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virtual KResultOr<size_t> read(FileDescription&, 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 FileDescription&, size_t) const override { return true; }
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virtual KResultOr<size_t> write(FileDescription&, u64, const UserOrKernelBuffer&, size_t) override { return EIO; }
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virtual KResult close() override;
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virtual String absolute_path(const FileDescription&) const override;
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virtual const char* class_name() const override { return "InodeWatcher"; };
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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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KResultOr<int> register_inode(Inode&, unsigned event_mask);
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KResult 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 Lock 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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