Kernel/Userspace/LibC: Implement basic dprintln for userspace

kernel/include/kernel/Debug.h

@@ -5,7 +5,7 @@
 #define dprintln(...)										\
 	do {													\
 		Debug::DebugLock::lock();							\
-		Debug::print_prefix(__FILE__, __LINE__);				\
+		Debug::print_prefix(__FILE__, __LINE__);			\
 		BAN::Formatter::print(Debug::putchar, __VA_ARGS__);	\
 		BAN::Formatter::print(Debug::putchar, "\r\n");		\
 		Debug::DebugLock::unlock();							\

kernel/include/kernel/Device/DebugDevice.h

@@ -0,0 +1,28 @@
+#include <kernel/Device/Device.h>
+
+namespace Kernel
+{
+
+	class DebugDevice : public CharacterDevice
+	{
+	public:
+		static BAN::ErrorOr<BAN::RefPtr<DebugDevice>> create(mode_t, uid_t, gid_t);
+
+		virtual dev_t rdev() const override { return m_rdev; }
+
+		virtual BAN::StringView name() const override { return "debug"sv; }
+
+	protected:
+		DebugDevice(mode_t mode, uid_t uid, gid_t gid, dev_t rdev)
+			: CharacterDevice(mode, uid, gid)
+			, m_rdev(rdev)
+		{ }
+
+		virtual BAN::ErrorOr<size_t> read_impl(off_t, BAN::ByteSpan) override { return 0; }
+		virtual BAN::ErrorOr<size_t> write_impl(off_t, BAN::ConstByteSpan buffer) override;
+
+	private:
+		const dev_t m_rdev;
+	};
+
+}

kernel/include/kernel/Process.h

@@ -62,6 +62,8 @@ namespace Kernel
 
 		bool is_session_leader() const { return pid() == sid(); }
 
+		const char* name() const { return m_cmdline.empty() ? "" : m_cmdline.front().data(); }
+
 		const Credentials& credentials() const { return m_credentials; }
 
 		BAN::ErrorOr<long> sys_exit(int status);