CTRL
buffer[0] = CTRL('H');
buffer[2] = CTRL('H');;
termios.c_cc[VINTR] = CTRL('C');
termios.c_cc[VQUIT] = CTRL('\\');
termios.c_cc[VKILL] = CTRL('U');
termios.c_cc[VEOF] = CTRL('D');
termios.c_cc[VSTART] = CTRL('S');
termios.c_cc[VSTOP] = CTRL('Q');
termios.c_cc[VSUSP] = CTRL('Z');