usr/sys/tty.h

/*
 * A clist structure is the head
 * of a linked list queue of characters.
 * The characters are stored in 4-word
 * blocks containing a link and 6 characters.
 * The routines getc and putc (m45.s or m40.s)
 * manipulate these structures.
 */
struct clist
{
        int     c_cc;           /* character count */
        int     c_cf;           /* pointer to first block */
        int     c_cl;           /* pointer to last block */
};

/*
 * A tty structure is needed for
 * each UNIX character device that
 * is used for normal terminal IO.
 * The routines in tty.c handle the
 * common code associated with
 * these structures.
 * The definition and device dependent
 * code is in each driver. (kl.c dc.c dh.c)
 */
struct tty
{
        struct  clist t_rawq;   /* input chars right off device */
        struct  clist t_canq;   /* input chars after erase and kill */
        struct  clist t_outq;   /* output list to device */
        int     t_flags;        /* mode, settable by stty call */
        int     *t_addr;        /* device address (register or startup fcn) */
        char    t_delct;        /* number of delimiters in raw q */
        char    t_col;          /* printing column of device */
        char    t_erase;        /* erase character */
        char    t_kill;         /* kill character */
        char    t_state;        /* internal state, not visible externally */
        char    t_char;         /* character temporary */
        int     t_speeds;       /* output+input line speed */
        int     t_dev;          /* device name */
};

char partab[];                  /* ASCII table: parity, character class */

#define TTIPRI  10
#define TTOPRI  20

#define CERASE  '#'             /* default special characters */
#define CEOT    004
#define CKILL   '@'
#define CQUIT   034             /* FS, cntl shift L */
#define CINTR   0177            /* DEL */

/* limits */
#define TTHIWAT 50
#define TTLOWAT 30
#define TTYHOG  256

/* modes */
#define HUPCL   01
#define XTABS   02
#define LCASE   04
#define ECHO    010
#define CRMOD   020
#define RAW     040
#define ODDP    0100
#define EVENP   0200
#define NLDELAY 001400
#define TBDELAY 006000
#define CRDELAY 030000
#define VTDELAY 040000

/* Hardware bits */
#define DONE    0200
#define IENABLE 0100

/* Internal state bits */
#define TIMEOUT 01              /* Delay timeout in progress */
#define WOPEN   02              /* Waiting for open to complete */
#define ISOPEN  04              /* Device is open */
#define SSTART  010             /* Has special start routine at addr */
#define CARR_ON 020             /* Software copy of carrier-present */
#define BUSY    040             /* Output in progress */
#define ASLEEP  0100            /* Wakeup when output done */