Kernel+LibKeyboard: Store the keymap name when setting system keymap

This way we can query the kernel to see which keymap is currently in use.

Kernel/API/Syscall.h

@@ -342,6 +342,7 @@ struct SC_setkeymap_params {
     Userspace<const u32*> shift_map;
     Userspace<const u32*> alt_map;
     Userspace<const u32*> altgr_map;
+    StringArgument map_name;
 };
 
 struct SC_create_thread_params {

Kernel/Devices/KeyboardDevice.cpp

@@ -391,10 +391,11 @@ KeyboardClient::~KeyboardClient()
 {
 }
 
-void KeyboardDevice::set_maps(Keyboard::CharacterMapData character_map_data)
+void KeyboardDevice::set_maps(const Keyboard::CharacterMapData& character_map_data, const String& character_map_name)
 {
     m_character_map.set_character_map_data(character_map_data);
-    dbg() << "New Character map passing to client.";
+    m_character_map.set_character_map_name(character_map_name);
+    dbg() << "New Character map \"" << character_map_name << "\" passing to client.";
 }
 
 }

Kernel/Devices/KeyboardDevice.h

@@ -51,7 +51,9 @@ public:
     KeyboardDevice();
 
     void set_client(KeyboardClient* client) { m_client = client; }
-    void set_maps(Keyboard::CharacterMapData character_map);
+    void set_maps(const Keyboard::CharacterMapData& character_map, const String& character_map_name);
+
+    const String keymap_name() { return m_character_map.character_map_name(); }
 
     // ^CharacterDevice
     virtual KResultOr<size_t> read(FileDescription&, size_t, u8*, size_t) override;

Kernel/Syscalls/setkeymap.cpp

@@ -56,7 +56,16 @@ int Process::sys$setkeymap(Userspace<const Syscall::SC_setkeymap_params*> user_p
     copy_from_user(character_map_data.alt_map, params.alt_map, CHAR_MAP_SIZE * sizeof(u32));
     copy_from_user(character_map_data.altgr_map, params.altgr_map, CHAR_MAP_SIZE * sizeof(u32));
 
-    KeyboardDevice::the().set_maps(character_map_data);
+    auto map_name = get_syscall_path_argument(params.map_name);
+    if (map_name.is_error()) {
+        return map_name.error();
+    }
+    constexpr size_t map_name_max_size = 50;
+    if (map_name.value().length() > map_name_max_size) {
+        return -ENAMETOOLONG;
+    }
+
+    KeyboardDevice::the().set_maps(character_map_data, map_name.value());
     return 0;
 }
 

Libraries/LibKeyboard/CharacterMap.cpp

@@ -36,7 +36,6 @@ namespace Keyboard {
 CharacterMap::CharacterMap(const String& file_name)
 {
 #ifdef KERNEL
-    UNUSED_PARAM(file_name);
     m_character_map_data = default_character_map;
 #else
     auto result = CharacterMapFile::load_from_file(file_name);
@@ -44,13 +43,14 @@ CharacterMap::CharacterMap(const String& file_name)
 
     m_character_map_data = result.value();
 #endif
+    m_character_map_name = file_name;
 }
 
 #ifndef KERNEL
 
 int CharacterMap::set_system_map()
 {
-    Syscall::SC_setkeymap_params params { m_character_map_data.map, m_character_map_data.shift_map, m_character_map_data.alt_map, m_character_map_data.altgr_map };
+    Syscall::SC_setkeymap_params params { m_character_map_data.map, m_character_map_data.shift_map, m_character_map_data.alt_map, m_character_map_data.altgr_map, { m_character_map_name.characters(), m_character_map_name.length() } };
     return syscall(SC_setkeymap, &params);
 }
 
@@ -92,4 +92,13 @@ void CharacterMap::set_character_map_data(CharacterMapData character_map_data)
     m_character_map_data = character_map_data;
 }
 
+void CharacterMap::set_character_map_name(const String& character_map_name)
+{
+    m_character_map_name = character_map_name;
+}
+
+const String CharacterMap::character_map_name()
+{
+    return m_character_map_name;
+}
 }

Libraries/LibKeyboard/CharacterMap.h

@@ -43,9 +43,13 @@ public:
 
     u32 get_char(KeyEvent);
     void set_character_map_data(CharacterMapData character_map_data);
+    void set_character_map_name(const String& character_map_name);
+
+    const String character_map_name();
 
 private:
     CharacterMapData m_character_map_data;
+    String m_character_map_name;
 };
 
 }