VirtualFileSystem/CharacterDevice.h


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#pragma once

#include <AK/Retainable.h>
#include <AK/Types.h>
#include "Limits.h"
#include "FileDescriptor.h"

class Process;

class CharacterDevice : public Retainable<CharacterDevice> {
public:
    virtual ~CharacterDevice();

    InodeMetadata metadata() const { return { }; }

    virtual RetainPtr<FileDescriptor> open(int& error, int options);

    virtual bool can_read(Process&) const = 0;
    virtual bool can_write(Process&) const = 0;

    virtual ssize_t read(Process&, byte* buffer, size_t bufferSize) = 0;
    virtual ssize_t write(Process&, const byte* buffer, size_t bufferSize) = 0;

    unsigned major() const { return m_major; }
    unsigned minor() const { return m_minor; }

    virtual bool is_tty() const { return false; }
    virtual bool is_master_pty() const { return false; }

    virtual int ioctl(Process&, unsigned request, unsigned arg);

protected:
    CharacterDevice(unsigned major, unsigned minor) : m_major(major), m_minor(minor) { }

private:
    unsigned m_major { 0 };
    unsigned m_minor { 0 };
};