TTYCTRL

Tty control structure

Synopsis:

typedef struct chario_entry {
    dispatch_t			*dpp;
    int             		coid;
    int             		timerid;
    unsigned        		max_devs;
    unsigned        		num_devs;
    struct sigevent 		event;
    struct sigevent 		timer;
    struct ttydev_entry 	*timer_list;
    unsigned        		num_events;
    struct ttydev_entry 	**event_queue;
    intrspin_t      		lock;
    unsigned     		flags;
} TTYCTRL;

Description:

A character driver shares the TTYCTRL structure with the io-char library. This structure is used to coordinate events, timers, and so on.

The members include:

dpp

A dispatch handle, returned by dispatch_create(). Used only by io-char.

coid

The connection ID. Used only by io-char.

timerid

The timer ID. Used only by io-char.

max_devs

Used by io-char and the driver to define the maximum number of devices supported.

num_devs

Used only by io-char to define the current number of devices supported.

event

Used by the driver to send pulse events to io-char's event handler. Flags are used to indicate which event occurred. The driver must send the event to io-char. See the entry for TTYDEV.

timer

A pulse to call the timer handler. Used only by io-char.

timer_list

Used only by io-char, it provides a list of active timers.

num_events

Used by io-char and the driver, it displays the current number of events for processing.

event_queue

An array of TTYDEV structures used by io-char and the driver to queue events.

lock

A lock used to control access to this structure. Use the dev_lock() and dev_unlock() macros to access this member.

flags

Flags that indicate which event occurred. See the entry for TTYDEV.

Classification:

QNX Neutrino

See also:

ttc(), TTYDEV