mirror of
https://github.com/RGBCube/serenity
synced 2025-10-31 15:22:43 +00:00
30861daa93
Before this change, we had File::mmap() which did all the work of setting up a VMObject, and then creating a Region in the current process's address space. This patch simplifies the interface by removing the region part. Files now only have to return a suitable VMObject from vmobject_for_mmap(), and then sys$mmap() itself will take care of actually mapping it into the address space. This fixes an issue where we'd try to block on I/O (for inode metadata lookup) while holding the address space spinlock. It also reduces time spent holding the address space lock.
40 lines
1.4 KiB
C++
40 lines
1.4 KiB
C++
/*
|
|
* Copyright (c) 2021, Patrick Meyer <git@the-space.agency>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <Kernel/Devices/CharacterDevice.h>
|
|
#include <Kernel/Devices/KCOVInstance.h>
|
|
|
|
namespace Kernel {
|
|
class KCOVDevice final : public CharacterDevice {
|
|
friend class DeviceManagement;
|
|
|
|
public:
|
|
static HashMap<ProcessID, KCOVInstance*>* proc_instance;
|
|
static HashMap<ThreadID, KCOVInstance*>* thread_instance;
|
|
|
|
static NonnullLockRefPtr<KCOVDevice> must_create();
|
|
static void free_thread();
|
|
static void free_process();
|
|
|
|
// ^File
|
|
ErrorOr<NonnullLockRefPtr<Memory::VMObject>> vmobject_for_mmap(Process&, Memory::VirtualRange const&, u64& offset, bool shared) override;
|
|
ErrorOr<NonnullLockRefPtr<OpenFileDescription>> open(int options) override;
|
|
|
|
protected:
|
|
KCOVDevice();
|
|
|
|
virtual StringView class_name() const override { return "KCOVDevice"sv; }
|
|
|
|
virtual bool can_read(OpenFileDescription const&, u64) const override final { return true; }
|
|
virtual bool can_write(OpenFileDescription const&, u64) const override final { return true; }
|
|
virtual ErrorOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) override { return EINVAL; }
|
|
virtual ErrorOr<size_t> write(OpenFileDescription&, u64, UserOrKernelBuffer const&, size_t) override { return EINVAL; }
|
|
virtual ErrorOr<void> ioctl(OpenFileDescription&, unsigned request, Userspace<void*> arg) override;
|
|
};
|
|
|
|
}
|