Kernel: TTY now stores foreground process pid

this will be process pgid when we have process groups

kernel/include/kernel/Terminal/TTY.h

@@ -23,6 +23,9 @@ namespace Kernel
 		uint32_t height() const { return m_height; }
 		uint32_t width() const { return m_width; }
 
+		void set_foreground_process(pid_t pgid) { m_foreground_process = pgid; }
+		pid_t foreground_process() const { return m_foreground_process; }
+
 		// for kprint
 		static void putchar_current(uint8_t ch);
 		static bool is_initialized();
@@ -94,6 +97,8 @@ namespace Kernel
 		TerminalDriver::Color m_foreground { TerminalColor::BRIGHT_WHITE };
 		TerminalDriver::Color m_background { TerminalColor::BLACK };
 
+		pid_t m_foreground_process { 0 };
+
 		termios m_termios;
 
 		struct Buffer