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Serenity Operating System
1/*
2 * Copyright (c) 2019-2020, Sergey Bugaev <bugaevc@serenityos.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice, this
9 * list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
22 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include "DevicesModel.h"
28#include <AK/JsonArray.h>
29#include <AK/JsonObject.h>
30#include <AK/JsonValue.h>
31#include <LibCore/DirIterator.h>
32#include <LibCore/File.h>
33#include <sys/stat.h>
34
35NonnullRefPtr<DevicesModel> DevicesModel::create()
36{
37 return adopt(*new DevicesModel);
38}
39
40DevicesModel::DevicesModel()
41{
42}
43
44DevicesModel::~DevicesModel()
45{
46}
47
48int DevicesModel::row_count(const GUI::ModelIndex&) const
49{
50 return m_devices.size();
51}
52
53int DevicesModel::column_count(const GUI::ModelIndex&) const
54{
55 return Column::__Count;
56}
57
58String DevicesModel::column_name(int column) const
59{
60 switch (column) {
61 case Column::Device:
62 return "Device";
63 case Column::Major:
64 return "Major";
65 case Column::Minor:
66 return "Minor";
67 case Column::ClassName:
68 return "Class";
69 case Column::Type:
70 return "Type";
71 default:
72 ASSERT_NOT_REACHED();
73 }
74}
75
76GUI::Model::ColumnMetadata DevicesModel::column_metadata(int column) const
77{
78 switch (column) {
79 case Column::Device:
80 return { 70, Gfx::TextAlignment::CenterLeft };
81 case Column::Major:
82 return { 32, Gfx::TextAlignment::CenterRight };
83 case Column::Minor:
84 return { 32, Gfx::TextAlignment::CenterRight };
85 case Column::ClassName:
86 return { 120, Gfx::TextAlignment::CenterLeft };
87 case Column::Type:
88 return { 120, Gfx::TextAlignment::CenterLeft };
89 default:
90 ASSERT_NOT_REACHED();
91 }
92}
93
94GUI::Variant DevicesModel::data(const GUI::ModelIndex& index, Role) const
95{
96 ASSERT(is_valid(index));
97
98 const DeviceInfo& device = m_devices[index.row()];
99 switch (index.column()) {
100 case Column::Device:
101 return device.path;
102 case Column::Major:
103 return device.major;
104 case Column::Minor:
105 return device.minor;
106 case Column::ClassName:
107 return device.class_name;
108 case Column::Type:
109 switch (device.type) {
110 case DeviceInfo::Type::Block:
111 return "Block";
112 case DeviceInfo::Type::Character:
113 return "Character";
114 default:
115 ASSERT_NOT_REACHED();
116 }
117 default:
118 ASSERT_NOT_REACHED();
119 }
120}
121
122void DevicesModel::update()
123{
124 auto proc_devices = Core::File::construct("/proc/devices");
125 if (!proc_devices->open(Core::IODevice::OpenMode::ReadOnly))
126 ASSERT_NOT_REACHED();
127
128 auto json = JsonValue::from_string(proc_devices->read_all()).as_array();
129
130 m_devices.clear();
131 json.for_each([this](auto& value) {
132 JsonObject device = value.as_object();
133 DeviceInfo device_info;
134
135 device_info.major = device.get("major").to_uint();
136 device_info.minor = device.get("minor").to_uint();
137 device_info.class_name = device.get("class_name").to_string();
138
139 String type_str = device.get("type").to_string();
140 if (type_str == "block")
141 device_info.type = DeviceInfo::Type::Block;
142 else if (type_str == "character")
143 device_info.type = DeviceInfo::Type::Character;
144 else
145 ASSERT_NOT_REACHED();
146
147 m_devices.append(move(device_info));
148 });
149
150 auto fill_in_paths_from_dir = [this](const String& dir) {
151 Core::DirIterator dir_iter { dir, Core::DirIterator::Flags::SkipDots };
152 while (dir_iter.has_next()) {
153 auto name = dir_iter.next_path();
154 auto path = String::format("%s/%s", dir.characters(), name.characters());
155 struct stat statbuf;
156 if (lstat(path.characters(), &statbuf) != 0) {
157 ASSERT_NOT_REACHED();
158 }
159 if (!S_ISBLK(statbuf.st_mode) && !S_ISCHR(statbuf.st_mode))
160 continue;
161 unsigned _major = major(statbuf.st_rdev);
162 unsigned _minor = minor(statbuf.st_rdev);
163
164 auto it = m_devices.find([_major, _minor](auto& device_info) {
165 return device_info.major == _major && device_info.minor == _minor;
166 });
167 if (it != m_devices.end()) {
168 (*it).path = move(path);
169 }
170 }
171 };
172
173 fill_in_paths_from_dir("/dev");
174 fill_in_paths_from_dir("/dev/pts");
175
176 did_update();
177}