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https://github.com/RGBCube/serenity
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acccf9ccda
Previously, VFS stored a list of all devices, and devices had to register and unregister themselves with it. This cleans up things a bit.
47 lines
1.3 KiB
C++
47 lines
1.3 KiB
C++
#pragma once
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// Device is the base class of everything that lives in the /dev directory.
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//
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// To expose a Device to the filesystem, simply pass two unique numbers to the constructor,
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// and then mknod a file in /dev with those numbers.
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//
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// There are two main subclasses:
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// - BlockDevice (random access)
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// - CharacterDevice (sequential)
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#include <AK/Function.h>
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#include <AK/HashMap.h>
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#include <Kernel/FileSystem/File.h>
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#include <Kernel/UnixTypes.h>
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class Device : public File {
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public:
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virtual ~Device() override;
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unsigned major() const { return m_major; }
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unsigned minor() const { return m_minor; }
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virtual String absolute_path(const FileDescription&) const override;
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virtual String absolute_path() const;
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uid_t uid() const { return m_uid; }
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uid_t gid() const { return m_gid; }
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virtual bool is_device() const override { return true; }
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virtual bool is_disk_device() const { return false; }
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static void for_each(Function<void(Device&)>);
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static Device* get_device(unsigned major, unsigned minor);
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protected:
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Device(unsigned major, unsigned minor);
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void set_uid(uid_t uid) { m_uid = uid; }
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void set_gid(gid_t gid) { m_gid = gid; }
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static HashMap<u32, Device*>& all_devices();
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private:
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unsigned m_major { 0 };
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unsigned m_minor { 0 };
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uid_t m_uid { 0 };
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gid_t m_gid { 0 };
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};
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