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Kernel: Rename FileDescription => OpenFileDescription

Browse source 
Dr. POSIX really calls these "open file description", not just
"file description", so let's call them exactly that. :^)
This commit is contained in:
Andreas Kling 2021-09-07 13:39:11 +02:00
parent dbd639a2d8
commit 4a9c18afb9
135 changed files with 680 additions and 680 deletions
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2
Kernel/Devices/Device.cpp
View file

@ -55,7 +55,7 @@ String Device::absolute_path() const
return String::formatted("/dev/{}", device_name());
}
String Device::absolute_path(const FileDescription&) const
String Device::absolute_path(const OpenFileDescription&) const
{
return absolute_path();
}

2
Kernel/Devices/Device.h
View file

@ -31,7 +31,7 @@ public:
unsigned major() const { return m_major; }
unsigned minor() const { return m_minor; }
virtual String absolute_path(const FileDescription&) const override;
virtual String absolute_path(const OpenFileDescription&) const override;
virtual String absolute_path() const;
UserID uid() const { return m_uid; }

6
Kernel/Devices/FullDevice.cpp
View file

@ -25,18 +25,18 @@ UNMAP_AFTER_INIT FullDevice::~FullDevice()
{
}
bool FullDevice::can_read(const FileDescription&, size_t) const
bool FullDevice::can_read(const OpenFileDescription&, size_t) const
{
return true;
}
KResultOr<size_t> FullDevice::read(FileDescription&, u64, UserOrKernelBuffer& buffer, size_t size)
KResultOr<size_t> FullDevice::read(OpenFileDescription&, u64, UserOrKernelBuffer& buffer, size_t size)
{
TRY(buffer.memset(0, size));
return size;
}
KResultOr<size_t> FullDevice::write(FileDescription&, u64, const UserOrKernelBuffer&, size_t size)
KResultOr<size_t> FullDevice::write(OpenFileDescription&, u64, const UserOrKernelBuffer&, size_t size)
{
if (size == 0)
return 0;

8
Kernel/Devices/FullDevice.h
View file

@ -24,10 +24,10 @@ private:
FullDevice();
// ^CharacterDevice
virtual KResultOr<size_t> read(FileDescription&, u64, UserOrKernelBuffer&, size_t) override;
virtual KResultOr<size_t> write(FileDescription&, u64, const UserOrKernelBuffer&, size_t) override;
virtual bool can_read(const FileDescription&, size_t) const override;
virtual bool can_write(const FileDescription&, size_t) const override { return true; }
virtual KResultOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) override;
virtual KResultOr<size_t> write(OpenFileDescription&, u64, const UserOrKernelBuffer&, size_t) override;
virtual bool can_read(const OpenFileDescription&, size_t) const override;
virtual bool can_write(const OpenFileDescription&, size_t) const override { return true; }
virtual StringView class_name() const override { return "FullDevice"; }
};

8
Kernel/Devices/HID/KeyboardDevice.cpp
View file

@ -273,12 +273,12 @@ UNMAP_AFTER_INIT KeyboardDevice::~KeyboardDevice()
{
}
bool KeyboardDevice::can_read(const FileDescription&, size_t) const
bool KeyboardDevice::can_read(const OpenFileDescription&, size_t) const
{
return !m_queue.is_empty();
}
KResultOr<size_t> KeyboardDevice::read(FileDescription&, u64, UserOrKernelBuffer& buffer, size_t size)
KResultOr<size_t> KeyboardDevice::read(OpenFileDescription&, u64, UserOrKernelBuffer& buffer, size_t size)
{
size_t nread = 0;
SpinlockLocker lock(m_queue_lock);
@ -306,12 +306,12 @@ KResultOr<size_t> KeyboardDevice::read(FileDescription&, u64, UserOrKernelBuffer
return nread;
}
KResultOr<size_t> KeyboardDevice::write(FileDescription&, u64, const UserOrKernelBuffer&, size_t)
KResultOr<size_t> KeyboardDevice::write(OpenFileDescription&, u64, const UserOrKernelBuffer&, size_t)
{
return 0;
}
KResult KeyboardDevice::ioctl(FileDescription&, unsigned request, Userspace<void*> arg)
KResult KeyboardDevice::ioctl(OpenFileDescription&, unsigned request, Userspace<void*> arg)
{
switch (request) {
case KEYBOARD_IOCTL_GET_NUM_LOCK: {

10
Kernel/Devices/HID/KeyboardDevice.h
View file

@ -25,10 +25,10 @@ public:
virtual ~KeyboardDevice() override;
// ^CharacterDevice
virtual KResultOr<size_t> read(FileDescription&, u64, UserOrKernelBuffer&, size_t) override;
virtual bool can_read(const FileDescription&, size_t) const override;
virtual KResultOr<size_t> write(FileDescription&, u64, const UserOrKernelBuffer&, size_t) override;
virtual bool can_write(const FileDescription&, size_t) const override { return true; }
virtual KResultOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) override;
virtual bool can_read(const OpenFileDescription&, size_t) const override;
virtual KResultOr<size_t> write(OpenFileDescription&, u64, const UserOrKernelBuffer&, size_t) override;
virtual bool can_write(const OpenFileDescription&, size_t) const override { return true; }
// ^HIDDevice
virtual Type instrument_type() const override { return Type::Keyboard; }
@ -37,7 +37,7 @@ public:
virtual mode_t required_mode() const override { return 0440; }
// ^File
virtual KResult ioctl(FileDescription&, unsigned request, Userspace<void*> arg) override;
virtual KResult ioctl(OpenFileDescription&, unsigned request, Userspace<void*> arg) override;
virtual String device_name() const override { return String::formatted("keyboard{}", minor()); }

6
Kernel/Devices/HID/MouseDevice.cpp
View file

@ -18,13 +18,13 @@ MouseDevice::~MouseDevice()
{
}
bool MouseDevice::can_read(const FileDescription&, size_t) const
bool MouseDevice::can_read(const OpenFileDescription&, size_t) const
{
SpinlockLocker lock(m_queue_lock);
return !m_queue.is_empty();
}
KResultOr<size_t> MouseDevice::read(FileDescription&, u64, UserOrKernelBuffer& buffer, size_t size)
KResultOr<size_t> MouseDevice::read(OpenFileDescription&, u64, UserOrKernelBuffer& buffer, size_t size)
{
VERIFY(size > 0);
size_t nread = 0;
@ -48,7 +48,7 @@ KResultOr<size_t> MouseDevice::read(FileDescription&, u64, UserOrKernelBuffer& b
return nread;
}
KResultOr<size_t> MouseDevice::write(FileDescription&, u64, const UserOrKernelBuffer&, size_t)
KResultOr<size_t> MouseDevice::write(OpenFileDescription&, u64, const UserOrKernelBuffer&, size_t)
{
return 0;
}

8
Kernel/Devices/HID/MouseDevice.h
View file

@ -23,10 +23,10 @@ public:
virtual ~MouseDevice() override;
// ^CharacterDevice
virtual KResultOr<size_t> read(FileDescription&, u64, UserOrKernelBuffer&, size_t) override;
virtual bool can_read(const FileDescription&, size_t) const override;
virtual KResultOr<size_t> write(FileDescription&, u64, const UserOrKernelBuffer&, size_t) override;
virtual bool can_write(const FileDescription&, size_t) const override { return true; }
virtual KResultOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) override;
virtual bool can_read(const OpenFileDescription&, size_t) const override;
virtual KResultOr<size_t> write(OpenFileDescription&, u64, const UserOrKernelBuffer&, size_t) override;
virtual bool can_write(const OpenFileDescription&, size_t) const override { return true; }
// ^HIDDevice
virtual Type instrument_type() const override { return Type::Mouse; }

8
Kernel/Devices/KCOVDevice.cpp
View file

@ -8,7 +8,7 @@
#include <AK/NonnullOwnPtr.h>
#include <Kernel/Devices/KCOVDevice.h>
#include <Kernel/Devices/KCOVInstance.h>
#include <Kernel/FileSystem/FileDescription.h>
#include <Kernel/FileSystem/OpenFileDescription.h>
#include <LibC/sys/ioctl_numbers.h>
#include <Kernel/Panic.h>
@ -61,7 +61,7 @@ void KCOVDevice::free_process()
delete kcov_instance;
}
KResultOr<NonnullRefPtr<FileDescription>> KCOVDevice::open(int options)
KResultOr<NonnullRefPtr<OpenFileDescription>> KCOVDevice::open(int options)
{
auto pid = Process::current().pid();
if (proc_instance->get(pid).has_value())
@ -73,7 +73,7 @@ KResultOr<NonnullRefPtr<FileDescription>> KCOVDevice::open(int options)
return File::open(options);
}
KResult KCOVDevice::ioctl(FileDescription&, unsigned request, Userspace<void*> arg)
KResult KCOVDevice::ioctl(OpenFileDescription&, unsigned request, Userspace<void*> arg)
{
KResult return_value = KSuccess;
auto thread = Thread::current();
@ -127,7 +127,7 @@ KResult KCOVDevice::ioctl(FileDescription&, unsigned request, Userspace<void*> a
return return_value;
}
KResultOr<Memory::Region*> KCOVDevice::mmap(Process& process, FileDescription&, Memory::VirtualRange const& range, u64 offset, int prot, bool shared)
KResultOr<Memory::Region*> KCOVDevice::mmap(Process& process, OpenFileDescription&, Memory::VirtualRange const& range, u64 offset, int prot, bool shared)
{
auto pid = process.pid();
auto maybe_kcov_instance = proc_instance->get(pid);

14
Kernel/Devices/KCOVDevice.h
View file

@ -22,8 +22,8 @@ public:
static void free_process();
// ^File
KResultOr<Memory::Region*> mmap(Process&, FileDescription&, Memory::VirtualRange const&, u64 offset, int prot, bool shared) override;
KResultOr<NonnullRefPtr<FileDescription>> open(int options) override;
KResultOr<Memory::Region*> mmap(Process&, OpenFileDescription&, Memory::VirtualRange const&, u64 offset, int prot, bool shared) override;
KResultOr<NonnullRefPtr<OpenFileDescription>> open(int options) override;
// ^Device
virtual mode_t required_mode() const override { return 0660; }
@ -32,12 +32,12 @@ public:
protected:
virtual StringView class_name() const override { return "KCOVDevice"; }
virtual bool can_read(const FileDescription&, size_t) const override final { return true; }
virtual bool can_write(const FileDescription&, size_t) const override final { return true; }
virtual bool can_read(const OpenFileDescription&, size_t) const override final { return true; }
virtual bool can_write(const OpenFileDescription&, size_t) const override final { return true; }
virtual void start_request(AsyncBlockDeviceRequest& request) override final { request.complete(AsyncDeviceRequest::Failure); }
virtual KResultOr<size_t> read(FileDescription&, u64, UserOrKernelBuffer&, size_t) override { return EINVAL; }
virtual KResultOr<size_t> write(FileDescription&, u64, const UserOrKernelBuffer&, size_t) override { return EINVAL; }
virtual KResult ioctl(FileDescription&, unsigned request, Userspace<void*> arg) override;
virtual KResultOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) override { return EINVAL; }
virtual KResultOr<size_t> write(OpenFileDescription&, u64, const UserOrKernelBuffer&, size_t) override { return EINVAL; }
virtual KResult ioctl(OpenFileDescription&, unsigned request, Userspace<void*> arg) override;
private:
KCOVDevice();

6
Kernel/Devices/MemoryDevice.cpp
View file

@ -27,17 +27,17 @@ UNMAP_AFTER_INIT MemoryDevice::~MemoryDevice()
{
}
KResultOr<size_t> MemoryDevice::read(FileDescription&, u64, UserOrKernelBuffer&, size_t)
KResultOr<size_t> MemoryDevice::read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t)
{
TODO();
}
void MemoryDevice::did_seek(FileDescription&, off_t)
void MemoryDevice::did_seek(OpenFileDescription&, off_t)
{
TODO();
}
KResultOr<Memory::Region*> MemoryDevice::mmap(Process& process, FileDescription&, Memory::VirtualRange const& range, u64 offset, int prot, bool shared)
KResultOr<Memory::Region*> MemoryDevice::mmap(Process& process, OpenFileDescription&, Memory::VirtualRange const& range, u64 offset, int prot, bool shared)
{
auto viewed_address = PhysicalAddress(offset);

12
Kernel/Devices/MemoryDevice.h
View file

@ -19,7 +19,7 @@ public:
static NonnullRefPtr<MemoryDevice> must_create();
~MemoryDevice();
virtual KResultOr<Memory::Region*> mmap(Process&, FileDescription&, Memory::VirtualRange const&, u64 offset, int prot, bool shared) override;
virtual KResultOr<Memory::Region*> mmap(Process&, OpenFileDescription&, Memory::VirtualRange const&, u64 offset, int prot, bool shared) override;
// ^Device
virtual mode_t required_mode() const override { return 0660; }
@ -28,13 +28,13 @@ public:
private:
MemoryDevice();
virtual StringView class_name() const override { return "MemoryDevice"; }
virtual bool can_read(const FileDescription&, size_t) const override { return true; }
virtual bool can_write(const FileDescription&, size_t) const override { return false; }
virtual bool can_read(const OpenFileDescription&, size_t) const override { return true; }
virtual bool can_write(const OpenFileDescription&, size_t) const override { return false; }
virtual bool is_seekable() const override { return true; }
virtual KResultOr<size_t> read(FileDescription&, u64, UserOrKernelBuffer&, size_t) override;
virtual KResultOr<size_t> write(FileDescription&, u64, const UserOrKernelBuffer&, size_t) override { return EINVAL; }
virtual KResultOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) override;
virtual KResultOr<size_t> write(OpenFileDescription&, u64, const UserOrKernelBuffer&, size_t) override { return EINVAL; }
virtual void did_seek(FileDescription&, off_t) override;
virtual void did_seek(OpenFileDescription&, off_t) override;
bool is_allowed_range(PhysicalAddress, Memory::VirtualRange const&) const;
};

6
Kernel/Devices/NullDevice.cpp
View file

@ -31,17 +31,17 @@ UNMAP_AFTER_INIT NullDevice::~NullDevice()
{
}
bool NullDevice::can_read(const FileDescription&, size_t) const
bool NullDevice::can_read(const OpenFileDescription&, size_t) const
{
return true;
}
KResultOr<size_t> NullDevice::read(FileDescription&, u64, UserOrKernelBuffer&, size_t)
KResultOr<size_t> NullDevice::read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t)
{
return 0;
}
KResultOr<size_t> NullDevice::write(FileDescription&, u64, const UserOrKernelBuffer&, size_t buffer_size)
KResultOr<size_t> NullDevice::write(OpenFileDescription&, u64, const UserOrKernelBuffer&, size_t buffer_size)
{
return buffer_size;
}

8
Kernel/Devices/NullDevice.h
View file

@ -25,10 +25,10 @@ public:
private:
// ^CharacterDevice
virtual KResultOr<size_t> read(FileDescription&, u64, UserOrKernelBuffer&, size_t) override;
virtual KResultOr<size_t> write(FileDescription&, u64, const UserOrKernelBuffer&, size_t) override;
virtual bool can_write(const FileDescription&, size_t) const override { return true; }
virtual bool can_read(const FileDescription&, size_t) const override;
virtual KResultOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) override;
virtual KResultOr<size_t> write(OpenFileDescription&, u64, const UserOrKernelBuffer&, size_t) override;
virtual bool can_write(const OpenFileDescription&, size_t) const override { return true; }
virtual bool can_read(const OpenFileDescription&, size_t) const override;
virtual StringView class_name() const override { return "NullDevice"; }
virtual bool is_seekable() const override { return true; }
};

6
Kernel/Devices/RandomDevice.cpp
View file

@ -24,12 +24,12 @@ UNMAP_AFTER_INIT RandomDevice::~RandomDevice()
{
}
bool RandomDevice::can_read(const FileDescription&, size_t) const
bool RandomDevice::can_read(const OpenFileDescription&, size_t) const
{
return true;
}
KResultOr<size_t> RandomDevice::read(FileDescription&, u64, UserOrKernelBuffer& buffer, size_t size)
KResultOr<size_t> RandomDevice::read(OpenFileDescription&, u64, UserOrKernelBuffer& buffer, size_t size)
{
return buffer.write_buffered<256>(size, [&](Bytes bytes) {
get_good_random_bytes(bytes);
@ -37,7 +37,7 @@ KResultOr<size_t> RandomDevice::read(FileDescription&, u64, UserOrKernelBuffer&
});
}
KResultOr<size_t> RandomDevice::write(FileDescription&, u64, const UserOrKernelBuffer&, size_t size)
KResultOr<size_t> RandomDevice::write(OpenFileDescription&, u64, const UserOrKernelBuffer&, size_t size)
{
// FIXME: Use input for entropy? I guess that could be a neat feature?
return size;

8
Kernel/Devices/RandomDevice.h
View file

@ -24,10 +24,10 @@ private:
RandomDevice();
// ^CharacterDevice
virtual KResultOr<size_t> read(FileDescription&, u64, UserOrKernelBuffer&, size_t) override;
virtual KResultOr<size_t> write(FileDescription&, u64, const UserOrKernelBuffer&, size_t) override;
virtual bool can_read(const FileDescription&, size_t) const override;
virtual bool can_write(const FileDescription&, size_t) const override { return true; }
virtual KResultOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) override;
virtual KResultOr<size_t> write(OpenFileDescription&, u64, const UserOrKernelBuffer&, size_t) override;
virtual bool can_read(const OpenFileDescription&, size_t) const override;
virtual bool can_write(const OpenFileDescription&, size_t) const override { return true; }
virtual StringView class_name() const override { return "RandomDevice"; }
};

8
Kernel/Devices/SB16.cpp
View file

@ -122,7 +122,7 @@ UNMAP_AFTER_INIT void SB16::initialize()
set_sample_rate(m_sample_rate);
}
KResult SB16::ioctl(FileDescription&, unsigned request, Userspace<void*> arg)
KResult SB16::ioctl(OpenFileDescription&, unsigned request, Userspace<void*> arg)
{
switch (request) {
case SOUNDCARD_IOCTL_GET_SAMPLE_RATE: {
@ -190,12 +190,12 @@ void SB16::set_irq_line(u8 irq_number)
change_irq_number(irq_number);
}
bool SB16::can_read(FileDescription const&, size_t) const
bool SB16::can_read(OpenFileDescription const&, size_t) const
{
return false;
}
KResultOr<size_t> SB16::read(FileDescription&, u64, UserOrKernelBuffer&, size_t)
KResultOr<size_t> SB16::read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t)
{
return 0;
}
@ -255,7 +255,7 @@ void SB16::wait_for_irq()
disable_irq();
}
KResultOr<size_t> SB16::write(FileDescription&, u64, UserOrKernelBuffer const& data, size_t length)
KResultOr<size_t> SB16::write(OpenFileDescription&, u64, UserOrKernelBuffer const& data, size_t length)
{
if (!m_dma_region) {
auto page = MM.allocate_supervisor_physical_page();

10
Kernel/Devices/SB16.h
View file

@ -27,10 +27,10 @@ public:
static SB16& the();
// ^CharacterDevice
virtual bool can_read(const FileDescription&, size_t) const override;
virtual KResultOr<size_t> read(FileDescription&, u64, UserOrKernelBuffer&, size_t) override;
virtual KResultOr<size_t> write(FileDescription&, u64, const UserOrKernelBuffer&, size_t) override;
virtual bool can_write(const FileDescription&, size_t) const override { return true; }
virtual bool can_read(const OpenFileDescription&, size_t) const override;
virtual KResultOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) override;
virtual KResultOr<size_t> write(OpenFileDescription&, u64, const UserOrKernelBuffer&, size_t) override;
virtual bool can_write(const OpenFileDescription&, size_t) const override { return true; }
virtual StringView purpose() const override { return class_name(); }
@ -38,7 +38,7 @@ public:
virtual mode_t required_mode() const override { return 0220; }
virtual String device_name() const override { return "audio"; }
virtual KResult ioctl(FileDescription&, unsigned, Userspace<void*>) override;
virtual KResult ioctl(OpenFileDescription&, unsigned, Userspace<void*>) override;
private:
// ^IRQHandler

8
Kernel/Devices/SerialDevice.cpp
View file

@ -49,12 +49,12 @@ UNMAP_AFTER_INIT SerialDevice::~SerialDevice()
{
}
bool SerialDevice::can_read(const FileDescription&, size_t) const
bool SerialDevice::can_read(const OpenFileDescription&, size_t) const
{
return (get_line_status() & DataReady) != 0;
}
KResultOr<size_t> SerialDevice::read(FileDescription&, u64, UserOrKernelBuffer& buffer, size_t size)
KResultOr<size_t> SerialDevice::read(OpenFileDescription&, u64, UserOrKernelBuffer& buffer, size_t size)
{
if (!size)
return 0;
@ -70,12 +70,12 @@ KResultOr<size_t> SerialDevice::read(FileDescription&, u64, UserOrKernelBuffer&
});
}
bool SerialDevice::can_write(const FileDescription&, size_t) const
bool SerialDevice::can_write(const OpenFileDescription&, size_t) const
{
return (get_line_status() & EmptyTransmitterHoldingRegister) != 0;
}
KResultOr<size_t> SerialDevice::write(FileDescription& description, u64, const UserOrKernelBuffer& buffer, size_t size)
KResultOr<size_t> SerialDevice::write(OpenFileDescription& description, u64, const UserOrKernelBuffer& buffer, size_t size)
{
if (!size)
return 0;

8
Kernel/Devices/SerialDevice.h
View file

@ -19,10 +19,10 @@ public:
virtual ~SerialDevice() override;
// ^CharacterDevice
virtual bool can_read(const FileDescription&, size_t) const override;
virtual KResultOr<size_t> read(FileDescription&, u64, UserOrKernelBuffer&, size_t) override;
virtual bool can_write(const FileDescription&, size_t) const override;
virtual KResultOr<size_t> write(FileDescription&, u64, const UserOrKernelBuffer&, size_t) override;
virtual bool can_read(const OpenFileDescription&, size_t) const override;
virtual KResultOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) override;
virtual bool can_write(const OpenFileDescription&, size_t) const override;
virtual KResultOr<size_t> write(OpenFileDescription&, u64, const UserOrKernelBuffer&, size_t) override;
void put_char(char);

6
Kernel/Devices/ZeroDevice.cpp
View file

@ -24,18 +24,18 @@ UNMAP_AFTER_INIT ZeroDevice::~ZeroDevice()
{
}
bool ZeroDevice::can_read(const FileDescription&, size_t) const
bool ZeroDevice::can_read(const OpenFileDescription&, size_t) const
{
return true;
}
KResultOr<size_t> ZeroDevice::read(FileDescription&, u64, UserOrKernelBuffer& buffer, size_t size)
KResultOr<size_t> ZeroDevice::read(OpenFileDescription&, u64, UserOrKernelBuffer& buffer, size_t size)
{
TRY(buffer.memset(0, size));
return size;
}
KResultOr<size_t> ZeroDevice::write(FileDescription&, u64, const UserOrKernelBuffer&, size_t size)
KResultOr<size_t> ZeroDevice::write(OpenFileDescription&, u64, const UserOrKernelBuffer&, size_t size)
{
return size;
}

8
Kernel/Devices/ZeroDevice.h
View file

@ -23,10 +23,10 @@ public:
private:
ZeroDevice();
// ^CharacterDevice
virtual KResultOr<size_t> read(FileDescription&, u64, UserOrKernelBuffer&, size_t) override;
virtual KResultOr<size_t> write(FileDescription&, u64, const UserOrKernelBuffer&, size_t) override;
virtual bool can_read(const FileDescription&, size_t) const override;
virtual bool can_write(const FileDescription&, size_t) const override { return true; }
virtual KResultOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) override;
virtual KResultOr<size_t> write(OpenFileDescription&, u64, const UserOrKernelBuffer&, size_t) override;
virtual bool can_read(const OpenFileDescription&, size_t) const override;
virtual bool can_write(const OpenFileDescription&, size_t) const override { return true; }
virtual StringView class_name() const override { return "ZeroDevice"; }
};