tty_t *
line2tty(devminor_t line)
{
/* Convert a terminal line to tty_table pointer */
tty_t* tp;
/* /dev/log goes to /dev/console, and both may be redirected. */
if (line == CONS_MINOR || line == LOG_MINOR)
line = consoleline;
if (line == VIDEO_MINOR) {
return(NULL);
} else if ((line - CONS_MINOR) < NR_CONS) {
tp = tty_addr(line - CONS_MINOR);
} else if ((line - RS232_MINOR) < NR_RS_LINES) {
tp = tty_addr(line - RS232_MINOR + NR_CONS);
} else {
tp = NULL;
}
if (tp != NULL && !tty_active(tp))
tp = NULL;
return(tp);
}
tty_t *
line2tty(devminor_t line)
{
/* Convert a terminal line to tty_table pointer */
tty_t* tp;
if ((line - TTYPX_MINOR) < NR_PTYS) {
tp = tty_addr(line - TTYPX_MINOR);
} else if ((line - PTYPX_MINOR) < NR_PTYS) {
tp = tty_addr(line - PTYPX_MINOR);
} else if ((line - UNIX98_MINOR) < NR_PTYS * 2) {
tp = tty_addr((line - UNIX98_MINOR) >> 1);
} else {
/*===========================================================================*
* tty_task *
*===========================================================================*/
PUBLIC void tty_task()
{
/* Main routine of the terminal task. */
message tty_mess; /* buffer for all incoming messages */
register struct tty_struct *tp;
tty_init();
while (TRUE) {
receive(ANY, &tty_mess);
if (!isttyline(tty_mess.TTY_LINE)) {
tty_mess.m_type = -1; /* force error */
tty_mess.TTY_LINE = 0; /* so hardware ints can get through */
}
tp = tty_addr(tty_mess.TTY_LINE);
switch(tty_mess.m_type) {
case HARD_INT:
do_int();
break;
case TTY_READ:
do_read(tp, &tty_mess);
break;
case TTY_WRITE:
do_write(tp, &tty_mess);
break;
case TTY_IOCTL:
do_ioctl(tp, &tty_mess);
break;
case TTY_SETPGRP:
do_setpgrp(tp, &tty_mess);
break;
case CANCEL:
do_cancel(tp, &tty_mess);
break;
default:
tty_reply(TASK_REPLY, tty_mess.m_source,
tty_mess.PROC_NR, EINVAL);
}
if (saved == TRUE && tty_mess.m_source == save_mess.m_source) {
saved = FALSE;
tty_reply(save_mess.m_type, save_mess.m_source,
save_mess.REP_PROC_NR, save_mess.REP_STATUS);
}
}
}
/*===========================================================================*
* tty_task *
*===========================================================================*/
PUBLIC void tty_task()
{
/* Main routine of the terminal task. */
message tty_mess; /* buffer for all incoming messages */
register tty_t *tp;
unsigned line;
/* Initialize the terminal lines. */
for (tp = FIRST_TTY; tp < END_TTY; tp++) tty_init(tp);
/* Display the Minix startup banner. */
printf("Minix %s.%s Copyright 1997 Prentice-Hall, Inc.\n\n",
OS_RELEASE, OS_VERSION);
#if (CHIP == INTEL)
/* Real mode, or 16/32-bit protected mode? */
#if _WORD_SIZE == 4
printf("Executing in 32-bit protected mode\n\n");
#else
printf("Executing in %s mode\n\n",
protected_mode ? "16-bit protected" : "real");
#endif
#endif
while (TRUE) {
/* Handle any events on any of the ttys. */
for (tp = FIRST_TTY; tp < END_TTY; tp++) {
if (tp->tty_events) handle_events(tp);
}
receive(ANY, &tty_mess);
/* A hardware interrupt is an invitation to check for events. */
if (tty_mess.m_type == HARD_INT) continue;
/* Check the minor device number. */
line = tty_mess.TTY_LINE;
if ((line - CONS_MINOR) < NR_CONS) {
tp = tty_addr(line - CONS_MINOR);
} else
if (line == LOG_MINOR) {
tp = tty_addr(0);
} else
if ((line - RS232_MINOR) < NR_RS_LINES) {
tp = tty_addr(line - RS232_MINOR + NR_CONS);
} else
if ((line - TTYPX_MINOR) < NR_PTYS) {
tp = tty_addr(line - TTYPX_MINOR + NR_CONS + NR_RS_LINES);
} else
if ((line - PTYPX_MINOR) < NR_PTYS) {
tp = tty_addr(line - PTYPX_MINOR + NR_CONS + NR_RS_LINES);
do_pty(tp, &tty_mess);
continue; /* this is a pty, not a tty */
} else {
tp = NULL;
}
/* If the device doesn't exist or is not configured return ENXIO. */
if (tp == NULL || !tty_active(tp)) {
tty_reply(TASK_REPLY, tty_mess.m_source,
tty_mess.PROC_NR, ENXIO);
continue;
}
/* Execute the requested function. */
switch (tty_mess.m_type) {
case DEV_READ: do_read(tp, &tty_mess); break;
case DEV_WRITE: do_write(tp, &tty_mess); break;
case DEV_IOCTL: do_ioctl(tp, &tty_mess); break;
case DEV_OPEN: do_open(tp, &tty_mess); break;
case DEV_CLOSE: do_close(tp, &tty_mess); break;
case CANCEL: do_cancel(tp, &tty_mess); break;
default: tty_reply(TASK_REPLY, tty_mess.m_source,
tty_mess.PROC_NR, EINVAL);
}
}
}
