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c8e2bb5605
The syscall is quite simple:
int watch_file(const char* path, int path_length);
It returns a file descriptor referring to a "InodeWatcher" object in the
kernel. It becomes readable whenever something changes about the inode.
Currently this is implemented by hooking the "metadata dirty bit" in
Inode which isn't perfect, but it's a start. :^)
39 lines
1020 B
C++
39 lines
1020 B
C++
#pragma once
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#include <AK/Badge.h>
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#include <AK/CircularQueue.h>
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#include <AK/WeakPtr.h>
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#include <Kernel/FileSystem/File.h>
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class Inode;
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class InodeWatcher final : public File {
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public:
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static NonnullRefPtr<InodeWatcher> create(Inode&);
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virtual ~InodeWatcher() override;
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struct Event {
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enum class Type {
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Invalid = 0,
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Modified,
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};
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Type type { Type::Invalid };
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};
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virtual bool can_read(FileDescription&) const override;
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virtual bool can_write(FileDescription&) const override;
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virtual ssize_t read(FileDescription&, u8*, ssize_t) override;
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virtual ssize_t write(FileDescription&, const u8*, ssize_t) 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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void notify_inode_event(Badge<Inode>, Event::Type);
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private:
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explicit InodeWatcher(Inode&);
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WeakPtr<Inode> m_inode;
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CircularQueue<Event, 32> m_queue;
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};
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