add termios struct, local mode flags and control character definitions

};

// type for special characters, termios' c_cc field

typedef unsigned char cc_t;

// type for terminal baud rate

typedef unsigned int speed_t;

// type for terminal modes

typedef unsigned int tcflags_t;

// subscripts for c_cc field :

#define VEOF		0

#define VEOL		1

#define VERASE		2

#define VINTR		3

#define VKILL		4

#define VMIN		5

#define VQUIT		6

#define VSTART		7

#define VSTOP		8

#define VSUSP		9

#define VTIME		10

#define NCCS		11

struct termios {

	tcflags_t c_iflag;

	tcflags_t c_oflag;

	tcflags_t c_cflag;

	tcflags_t c_lflag;

	cc_t c_cc[NCCS];

};

/**

 * Flags for local mode (c_lflag field)

 */

#define ECHO		(1<<0)

#define ECHOE		(1<<1)

#define ECHOK		(1<<2)

#define ECHONL		(1<<3)

#define ICANON		(1<<4)

#define IEXTEN		(1<<5)

#define ISIG		(1<<6)

#define NOFLSH		(1<<7)

#define TOSTOP		(1<<8)

// POSIX extension

#define ECHOCTL		(1<<9)

// IOCTL namespace

#define TTYCTL			IOCTL_NAMESPACE('T', 'T')

/**