Kernel: Add /dev/tty symlink that targets the current tty

kernel/include/kernel/FS/DevFS/FileSystem.h

@@ -14,7 +14,7 @@ namespace Kernel
 		
 		void initialize_device_updater();
 	
-		void add_device(BAN::StringView path, BAN::RefPtr<Device>);
+		void add_device(BAN::StringView path, BAN::RefPtr<RamInode>);
 
 		dev_t get_next_dev();
 

kernel/include/kernel/Terminal/Serial.h

@@ -45,11 +45,15 @@ namespace Kernel
 	
 		virtual void update() override;
 
+	protected:
+		virtual BAN::StringView name() const override { return m_name; }
+
 	private:
 		SerialTTY(Serial);
 		bool initialize();
 
 	private:
+		BAN::String m_name;
 		Serial m_serial;
 	
 	public:

kernel/include/kernel/Terminal/TTY.h

@@ -47,6 +47,8 @@ namespace Kernel
 			: CharacterDevice(mode, uid, gid)
 		{ }
 
+		virtual BAN::StringView name() const = 0;
+
 	private:
 		void do_backspace();
 

kernel/include/kernel/Terminal/VirtualTTY.h

@@ -23,6 +23,9 @@ namespace Kernel
 		virtual uint32_t width() const override { return m_width; }
 		virtual void putchar(uint8_t ch) override;
 
+	protected:
+		virtual BAN::StringView name() const override { return m_name; }
+
 	private:
 		VirtualTTY(TerminalDriver*);
 
@@ -64,6 +67,8 @@ namespace Kernel
 		};
 
 	private:
+		BAN::String m_name;
+
 		State m_state { State::Normal };
 		AnsiState m_ansi_state { };
 		UTF8State m_utf8_state { };

kernel/kernel/FS/DevFS/FileSystem.cpp

@@ -52,7 +52,7 @@ namespace Kernel
 		);
 	}
 
-	void DevFileSystem::add_device(BAN::StringView path, BAN::RefPtr<Device> device)
+	void DevFileSystem::add_device(BAN::StringView path, BAN::RefPtr<RamInode> device)
 	{
 		ASSERT(!path.contains('/'));
 		MUST(reinterpret_cast<RamDirectoryInode*>(root_inode().ptr())->add_inode(path, device));

kernel/kernel/Terminal/Serial.cpp

@@ -207,7 +207,9 @@ namespace Kernel
 		: TTY(0660, 0, 0)
 		, m_serial(serial)
 		, m_rdev(next_rdev())
-	{}
+	{
+		m_name = BAN::String::formatted("ttyS{}", minor(rdev()));
+	}
 
 	BAN::ErrorOr<BAN::RefPtr<SerialTTY>> SerialTTY::create(Serial serial)
 	{
@@ -228,11 +230,8 @@ namespace Kernel
 			IDT::register_irq_handler(COM2_IRQ, irq3_handler);
 		}
 
-		ASSERT(minor(tty->rdev()) < 10);
-		char name[] = { 't', 't', 'y', 'S', (char)('0' + minor(tty->rdev())), '\0' };
-
 		auto ref_ptr = BAN::RefPtr<SerialTTY>::adopt(tty);
-		DevFileSystem::get().add_device(name, ref_ptr);
+		DevFileSystem::get().add_device(ref_ptr->name(), ref_ptr);
 		if (serial.port() == COM1_PORT)
 			s_com1 = ref_ptr;
 		if (serial.port() == COM2_PORT)

kernel/kernel/Terminal/TTY.cpp

@@ -25,6 +25,20 @@ namespace Kernel
 	void TTY::set_as_current()
 	{
 		s_tty = this;
+
+		auto inode_or_error = DevFileSystem::get().root_inode()->directory_find_inode("tty");
+		if (inode_or_error.is_error())
+		{
+			if (inode_or_error.error().get_error_code() == ENOENT)
+				DevFileSystem::get().add_device("tty"sv, MUST(RamSymlinkInode::create(DevFileSystem::get(), s_tty->name(), S_IFLNK | 0666, 0, 0)));
+			else
+				dwarnln("{}", inode_or_error.error());
+			return;
+		}
+
+		auto inode = inode_or_error.release_value();
+		if (inode->mode().iflnk())
+			MUST(((RamSymlinkInode*)inode.ptr())->set_link_target(name()));
 	}
 
 	void TTY::initialize_devices()

kernel/kernel/Terminal/VirtualTTY.cpp

@@ -36,11 +36,8 @@ namespace Kernel
 		auto* tty = new VirtualTTY(driver);
 		ASSERT(tty);
 
-		ASSERT(minor(tty->rdev()) < 10);
-		char name[5] { 't', 't', 'y', (char)('0' + minor(tty->rdev())), '\0' };
-
 		auto ref_ptr = BAN::RefPtr<VirtualTTY>::adopt(tty);
-		DevFileSystem::get().add_device(name, ref_ptr);
+		DevFileSystem::get().add_device(ref_ptr->name(), ref_ptr);
 		return ref_ptr;
 	}
 
@@ -49,6 +46,8 @@ namespace Kernel
 		, m_terminal_driver(driver)
 		, m_rdev(next_rdev())
 	{
+		m_name = BAN::String::formatted("tty{}", minor(rdev()));
+
 		m_width = m_terminal_driver->width();
 		m_height = m_terminal_driver->height();
 

userspace/init/main.cpp

@@ -11,7 +11,7 @@
 
 void initialize_stdio()
 {
-	const char* tty = "/dev/tty0";
+	const char* tty = "/dev/tty";
 	if (open(tty, O_RDONLY | O_TTY_INIT) != 0) _exit(1);
 	if (open(tty, O_WRONLY) != 1) _exit(1);
 	if (open(tty, O_WRONLY) != 2) _exit(1);