blob: a31e2e6f209127f40e34a9182c947d588ef6c069 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
|
#include "kernel/filesystem/file_descriptor_table.hpp"
#include "kapi/system.hpp"
#include "kernel/filesystem/open_file_description.hpp"
#include <kstd/memory>
#include <algorithm>
#include <cstddef>
#include <optional>
namespace kernel::filesystem
{
namespace
{
constinit auto static global_file_descriptor_table = std::optional<file_descriptor_table>{};
} // namespace
auto file_descriptor_table::init() -> void
{
if (global_file_descriptor_table)
{
kapi::system::panic("[FILESYSTEM] File descriptor table has already been initialized.");
}
global_file_descriptor_table.emplace(file_descriptor_table{});
}
auto file_descriptor_table::get() -> file_descriptor_table &
{
if (!global_file_descriptor_table)
{
kapi::system::panic("[FILESYSTEM] File descriptor table has not been initialized.");
}
return *global_file_descriptor_table;
}
auto file_descriptor_table::reset() -> void
{
global_file_descriptor_table.reset();
}
auto file_descriptor_table::add_file(kstd::shared_ptr<open_file_description> const & file_description) -> int
{
if (!file_description)
{
// TODO BA-FS26 panic or errorcode?
return -1;
}
auto it = std::ranges::find_if(m_open_files, [](auto const & open_file) { return open_file == nullptr; });
if (it != m_open_files.end())
{
*it = file_description;
return static_cast<int>(it - m_open_files.begin());
}
m_open_files.push_back(file_description);
return static_cast<int>(m_open_files.size() - 1);
}
auto file_descriptor_table::get_file(int fd) const -> kstd::shared_ptr<open_file_description>
{
if (fd < 0)
{
return nullptr;
}
auto const index = static_cast<size_t>(fd);
if (index >= m_open_files.size())
{
return nullptr;
}
return m_open_files.at(index);
}
auto file_descriptor_table::remove_file(int fd) -> void
{
if (fd < 0)
{
return;
}
auto const index = static_cast<size_t>(fd);
if (index >= m_open_files.size())
{
return;
}
m_open_files.at(index) = nullptr;
}
} // namespace kernel::filesystem
|
