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Kernel: Add Device base class for CharacterDevice.

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..to prepare for adding a BlockDevice class.
This commit is contained in:
Andreas Kling 2019-02-16 00:47:20 +01:00
parent c6ca6522fc
commit 994279d56c
11 changed files with 113 additions and 94 deletions
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45
Kernel/CharacterDevice.h
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@ -1,48 +1,11 @@
#pragma once
#include <AK/Retainable.h>
#include <AK/Types.h>
#include "Limits.h"
#include "FileDescriptor.h"
#include <Kernel/Device.h>
class Process;
class CharacterDevice : public Retainable<CharacterDevice> {
class CharacterDevice : public Device {
public:
virtual ~CharacterDevice();
InodeMetadata metadata() const { return { }; }
virtual RetainPtr<FileDescriptor> open(int& error, int options);
virtual void close();
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);
virtual const char* class_name() const = 0;
uid_t uid() const { return m_uid; }
uid_t gid() const { return m_gid; }
virtual ~CharacterDevice() override;
protected:
CharacterDevice(unsigned major, unsigned minor) : m_major(major), m_minor(minor) { }
void set_uid(uid_t uid) { m_uid = uid; }
void set_gid(gid_t gid) { m_gid = gid; }
private:
unsigned m_major { 0 };
unsigned m_minor { 0 };
uid_t m_uid { 0 };
gid_t m_gid { 0 };
CharacterDevice(unsigned major, unsigned minor) : Device(major, minor) { }
};