/*===========================================================================*
* tty_task *
*===========================================================================*/
int main(void)
{
/* Main routine of the terminal task. */
message tty_mess; /* buffer for all incoming messages */
int ipc_status;
int line;
int r;
register tty_t *tp;
/* SEF local startup. */
sef_local_startup();
while (TRUE) {
/* Check for and handle any events on any of the ttys. */
for (tp = FIRST_TTY; tp < END_TTY; tp++) {
if (tp->tty_events) handle_events(tp);
}
/* Get a request message. */
r= driver_receive(ANY, &tty_mess, &ipc_status);
if (r != 0)
panic("driver_receive failed with: %d", r);
/* First handle all kernel notification types that the TTY supports.
* - An alarm went off, expire all timers and handle the events.
* - A hardware interrupt also is an invitation to check for events.
* - A new kernel message is available for printing.
* - Reset the console on system shutdown.
* Then see if this message is different from a normal device driver
* request and should be handled separately. These extra functions
* do not operate on a device, in constrast to the driver requests.
*/
if (is_ipc_notify(ipc_status)) {
switch (_ENDPOINT_P(tty_mess.m_source)) {
case CLOCK:
/* run watchdogs of expired timers */
expire_timers(tty_mess.m_notify.timestamp);
break;
case HARDWARE:
/* hardware interrupt notification */
#if NR_RS_LINES > 0
/* serial I/O */
if (tty_mess.m_notify.interrupts & rs_irq_set)
rs_interrupt(&tty_mess);
#endif
/* run watchdogs of expired timers */
expire_timers(tty_mess.m_notify.timestamp);
break;
default:
/* do nothing */
break;
}
/* done, get new message */
continue;
}
switch (tty_mess.m_type) {
case TTY_FKEY_CONTROL: /* (un)register a fkey observer */
do_fkey_ctl(&tty_mess);
continue;
case TTY_INPUT_UP:
case TTY_INPUT_EVENT:
do_input(&tty_mess);
continue;
default: /* should be a driver request */
; /* do nothing; end switch */
}
if (!IS_CDEV_RQ(tty_mess.m_type)) {
chardriver_process(&tty_tab, &tty_mess, ipc_status);
continue;
}
/* Only device requests should get to this point.
* All requests have a minor device number.
*/
if (OK != chardriver_get_minor(&tty_mess, &line))
continue;
if (line == VIDEO_MINOR) {
do_video(&tty_mess, ipc_status);
continue;
}
/* Execute the requested device driver function. */
chardriver_process(&tty_tab, &tty_mess, ipc_status);
}
return 0;
}
/*===========================================================================*
* tty_task *
*===========================================================================*/
int main(int argc, char **argv)
{
/* Main routine of the terminal task. */
message tty_mess; /* buffer for all incoming messages */
int ipc_status;
int line;
int r;
register tty_t *tp;
env_setargs(argc, argv);
tty_startup();
while (TRUE) {
/* Check for and handle any events on any of the ttys. */
for (tp = FIRST_TTY; tp < END_TTY; tp++) {
if (tp->tty_events) handle_events(tp);
}
/* Get a request message. */
r= driver_receive(ANY, &tty_mess, &ipc_status);
if (r != 0)
panic("driver_receive failed with: %d", r);
if (is_ipc_notify(ipc_status)) {
switch (_ENDPOINT_P(tty_mess.m_source)) {
case CLOCK:
/* run watchdogs of expired timers */
expire_timers(tty_mess.m_notify.timestamp);
break;
default:
/* do nothing */
break;
}
/* done, get new message */
continue;
}
if (!IS_CDEV_RQ(tty_mess.m_type)) {
chardriver_process(&tty_tab, &tty_mess, ipc_status);
continue;
}
/* Only device requests should get to this point.
* All requests have a minor device number.
*/
if (OK != chardriver_get_minor(&tty_mess, &line))
continue;
if (is_pty(line)) {
/* Terminals and pseudo terminals belong together. We can only
* make a distinction between the two based on minor number and
* not on position in the tty_table. Hence this special case.
*/
do_pty(&tty_mess, ipc_status);
continue;
}
/* Execute the requested device driver function. */
chardriver_process(&tty_tab, &tty_mess, ipc_status);
}
return 0;
}
