usr/src/sys/h/conf.h

/*      conf.h  4.1     11/9/80 */

/*
 * Declaration of block device
 * switch. Each entry (row) is
 * the only link between the
 * main unix code and the driver.
 * The initialization of the
 * device switches is in the
 * file conf.c.
 */
extern struct bdevsw
{
        int     (*d_open)();
        int     (*d_close)();
        int     (*d_strategy)();
        struct buf *d_tab;
} bdevsw[];

/*
 * Character device switch.
 */
extern struct cdevsw
{
        int     (*d_open)();
        int     (*d_close)();
        int     (*d_read)();
        int     (*d_write)();
        int     (*d_ioctl)();
        int     (*d_stop)();
        int     (*d_reset)();
        struct tty *d_ttys;
} cdevsw[];

/*
 * tty line control switch.
 */
extern struct linesw
{
        int     (*l_open)();
        int     (*l_close)();
        int     (*l_read)();
        char    *(*l_write)();
        int     (*l_ioctl)();
        int     (*l_rint)();
        int     (*l_rend)();
        int     (*l_meta)();
        int     (*l_start)();
        int     (*l_modem)();
} linesw[];

/*
 * Swap device information
 */
extern struct swdevt
{
        dev_t   sw_dev;
        int     sw_freed;
} swdevt[];