TTY fixes:

- reenable code to restore screen/cursor at shutdown
- add proper signal checking logic
- lock to first console during shutdown

drivers/tty/console.c

@@ -103,6 +103,8 @@ PRIVATE int nr_cons= 1;		/* actual number of consoles */
 PRIVATE console_t cons_table[NR_CONS];
 PRIVATE console_t *curcons = NULL;	/* currently visible */
 
+PRIVATE int shutting_down = FALSE;	/* don't allow console switches */
+
 /* Color if using a color controller. */
 #define color	(vid_port == C_6845)
 
@@ -1228,12 +1230,11 @@ PUBLIC void toggle_scroll()
 PUBLIC void cons_stop()
 {
 /* Prepare for halt or reboot. */
-  select_console(0);
-#if 0
   cons_org0();
   softscroll = 1;
+  select_console(0);
   cons_table[0].c_attr = cons_table[0].c_blank = BLANK_COLOR;
-#endif
+  shutting_down = TRUE;
 }
 
 /*===========================================================================*
@@ -1298,6 +1299,8 @@ PUBLIC void select_console(int cons_line)
 {
 /* Set the current console to console number 'cons_line'. */
 
+  if (shutting_down) return;
+
   if (cons_line < 0 || cons_line >= nr_cons) return;
 
   ccurrent = cons_line;

drivers/tty/tty.c

@@ -102,6 +102,7 @@ unsigned long rs_irq_set = 0;
 
 struct kmessages kmess;
 
+FORWARD _PROTOTYPE( void got_signal, (void)				);
 FORWARD _PROTOTYPE( void tty_timed_out, (timer_t *tp)			);
 FORWARD _PROTOTYPE( void expire_timers, (void)				);
 FORWARD _PROTOTYPE( void settimer, (tty_t *tty_ptr, int enable)		);
@@ -219,8 +220,8 @@ PUBLIC int main(void)
 				expire_timers();
 				break;
 			case PM_PROC_NR:
-				/* switch to primary console */
-				cons_stop();
+				/* signal */
+				got_signal();
 				break;
 			case SYSTEM:
 				/* system signal */
@@ -343,6 +344,24 @@ PRIVATE void sef_local_startup()
   sef_startup();
 }
 
+/*===========================================================================*
+ *				got_signal				     *
+ *===========================================================================*/
+PRIVATE void got_signal()
+{
+/* PM notified us that we have received a signal. If it is a SIGTERM, assume
+ * that the system is shutting down.
+ */
+  sigset_t set;
+
+  if (getsigset(&set) != 0) return;
+
+  if (!sigismember(&set, SIGTERM)) return;
+
+  /* switch to primary console */
+  cons_stop();
+}
+
 /*===========================================================================*
  *				do_status				     *
  *===========================================================================*/