mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-11-11 01:06:01 +03:00
84 lines
2.4 KiB
C++
84 lines
2.4 KiB
C++
/*
|
|
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
// Device is the base class of everything that lives in the /dev directory.
|
|
//
|
|
// To expose a Device to the filesystem, simply pass two unique numbers to the constructor,
|
|
// and then mknod a file in /dev with those numbers.
|
|
//
|
|
// There are two main subclasses:
|
|
// - BlockDevice (random access)
|
|
// - CharacterDevice (sequential)
|
|
#include <AK/DoublyLinkedList.h>
|
|
#include <AK/Error.h>
|
|
#include <AK/Function.h>
|
|
#include <AK/HashMap.h>
|
|
#include <AK/RefPtr.h>
|
|
#include <Kernel/Devices/AsyncDeviceRequest.h>
|
|
#include <Kernel/FileSystem/DeviceFileTypes.h>
|
|
#include <Kernel/FileSystem/File.h>
|
|
#include <Kernel/FileSystem/SysFS.h>
|
|
#include <Kernel/UnixTypes.h>
|
|
|
|
namespace Kernel {
|
|
|
|
class Device : public File {
|
|
protected:
|
|
enum class State {
|
|
Normal,
|
|
BeingRemoved,
|
|
};
|
|
|
|
public:
|
|
virtual ~Device() override;
|
|
|
|
MajorNumber major() const { return m_major; }
|
|
MinorNumber minor() const { return m_minor; }
|
|
|
|
virtual ErrorOr<NonnullOwnPtr<KString>> pseudo_path(const OpenFileDescription&) const override;
|
|
|
|
UserID uid() const { return m_uid; }
|
|
GroupID gid() const { return m_gid; }
|
|
|
|
virtual bool is_device() const override { return true; }
|
|
virtual void will_be_destroyed() override;
|
|
virtual void after_inserting();
|
|
void process_next_queued_request(Badge<AsyncDeviceRequest>, const AsyncDeviceRequest&);
|
|
|
|
template<typename AsyncRequestType, typename... Args>
|
|
ErrorOr<NonnullRefPtr<AsyncRequestType>> try_make_request(Args&&... args)
|
|
{
|
|
auto request = TRY(adopt_nonnull_ref_or_enomem(new (nothrow) AsyncRequestType(*this, forward<Args>(args)...)));
|
|
SpinlockLocker lock(m_requests_lock);
|
|
bool was_empty = m_requests.is_empty();
|
|
m_requests.append(request);
|
|
if (was_empty)
|
|
request->do_start(move(lock));
|
|
return request;
|
|
}
|
|
|
|
protected:
|
|
Device(MajorNumber major, MinorNumber minor);
|
|
void set_uid(UserID uid) { m_uid = uid; }
|
|
void set_gid(GroupID gid) { m_gid = gid; }
|
|
|
|
private:
|
|
MajorNumber m_major { 0 };
|
|
MinorNumber m_minor { 0 };
|
|
UserID m_uid { 0 };
|
|
GroupID m_gid { 0 };
|
|
|
|
State m_state { State::Normal };
|
|
|
|
Spinlock m_requests_lock;
|
|
DoublyLinkedList<RefPtr<AsyncDeviceRequest>> m_requests;
|
|
RefPtr<SysFSDeviceComponent> m_sysfs_component;
|
|
};
|
|
|
|
}
|