jcs.org
Serenity Operating System
1/*
2 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
3 *
4 * SPDX-License-Identifier: BSD-2-Clause
5 */
6
7#include <Kernel/API/POSIX/errno.h>
8#include <Kernel/Devices/DeviceManagement.h>
9#include <Kernel/Devices/FullDevice.h>
10#include <Kernel/Sections.h>
11
12namespace Kernel {
13
14UNMAP_AFTER_INIT NonnullLockRefPtr<FullDevice> FullDevice::must_create()
15{
16 auto full_device_or_error = DeviceManagement::try_create_device<FullDevice>();
17 // FIXME: Find a way to propagate errors
18 VERIFY(!full_device_or_error.is_error());
19 return full_device_or_error.release_value();
20}
21
22UNMAP_AFTER_INIT FullDevice::FullDevice()
23 : CharacterDevice(1, 7)
24{
25}
26
27UNMAP_AFTER_INIT FullDevice::~FullDevice() = default;
28
29bool FullDevice::can_read(OpenFileDescription const&, u64) const
30{
31 return true;
32}
33
34ErrorOr<size_t> FullDevice::read(OpenFileDescription&, u64, UserOrKernelBuffer& buffer, size_t size)
35{
36 TRY(buffer.memset(0, size));
37 return size;
38}
39
40ErrorOr<size_t> FullDevice::write(OpenFileDescription&, u64, UserOrKernelBuffer const&, size_t size)
41{
42 if (size == 0)
43 return 0;
44 return ENOSPC;
45}
46}