Tty control structure
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;
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.
QNX Neutrino
ttc(),
TTYDEV