tty: Put console in K_OFF mode

This disables all kernel key bindings (VT switch keybindings, caps lock
etc) and disables delivery of console input.

src/tty.c

@@ -39,10 +39,10 @@ struct tty {
 	int fd;
 	struct termios terminal_attributes;
 
-	struct wl_event_source *input_source;
 	struct wl_event_source *vt_source;
 	tty_vt_func_t vt_func;
 	int vt, starting_vt, has_vt;
+	int kb_mode;
 };
 
 static int vt_handler(int signal_number, void *data)
@@ -64,18 +64,6 @@ static int vt_handler(int signal_number, void *data)
 	return 1;
 }
 
-static int
-on_tty_input(int fd, uint32_t mask, void *data)
-{
-	struct tty *tty = data;
-
-	/* Ignore input to tty.  We get keyboard events from evdev
-	 */
-	tcflush(tty->fd, TCIFLUSH);
-
-	return 1;
-}
-
 static int
 try_open_vt(struct tty *tty)
 {
@@ -186,17 +174,17 @@ tty_create(struct weston_compositor *compositor, tty_vt_func_t vt_func,
 	if (tcsetattr(tty->fd, TCSANOW, &raw_attributes) < 0)
 		fprintf(stderr, "could not put terminal into raw mode: %m\n");
 
-	loop = wl_display_get_event_loop(compositor->wl_display);
-	tty->input_source =
-		wl_event_loop_add_fd(loop, tty->fd,
-				     WL_EVENT_READABLE, on_tty_input, tty);
-	if (!tty->input_source)
+	ioctl(tty->fd, KDGKBMODE, &tty->kb_mode);
+	ret = ioctl(tty->fd, KDSKBMODE, K_OFF);
+	if (ret) {
+		fprintf(stderr, "failed to set K_OFF keyboard mode on tty: %m\n");
 		goto err_attr;
+	}
 
 	ret = ioctl(tty->fd, KDSETMODE, KD_GRAPHICS);
 	if (ret) {
 		fprintf(stderr, "failed to set KD_GRAPHICS mode on tty: %m\n");
-		goto err_input_source;
+		goto err_kdkbmode;
 	}
 
 	tty->has_vt = 1;
@@ -208,6 +196,7 @@ tty_create(struct weston_compositor *compositor, tty_vt_func_t vt_func,
 		goto err_kdmode;
 	}
 
+	loop = wl_display_get_event_loop(compositor->wl_display);
 	tty->vt_source =
 		wl_event_loop_add_signal(loop, SIGUSR1, vt_handler, tty);
 	if (!tty->vt_source)
@@ -221,8 +210,8 @@ err_vtmode:
 err_kdmode:
 	ioctl(tty->fd, KDSETMODE, KD_TEXT);
 
-err_input_source:
-	wl_event_source_remove(tty->input_source);
+err_kdkbmode:
+	ioctl(tty->fd, KDSKBMODE, tty->kb_mode);
 
 err_attr:
 	tcsetattr(tty->fd, TCSANOW, &tty->terminal_attributes);
@@ -241,6 +230,9 @@ tty_destroy(struct tty *tty)
         if(!tty)
                 return;
 
+	if (ioctl(tty->fd, KDSKBMODE, tty->kb_mode))
+		fprintf(stderr, "failed to restore keyboard mode: %m\n");
+
 	if (ioctl(tty->fd, KDSETMODE, KD_TEXT))
 		fprintf(stderr,
 			"failed to set KD_TEXT mode on tty: %m\n");
@@ -258,7 +250,6 @@ tty_destroy(struct tty *tty)
 		ioctl(tty->fd, VT_WAITACTIVE, tty->starting_vt);
 	}
 
-	wl_event_source_remove(tty->input_source);
 	wl_event_source_remove(tty->vt_source);
 
 	close(tty->fd);