Function constty_clear

freebsd/kern/kern_cons.c:592–605

* Disable console redirection to a tty. */

 * Disable console redirection to a tty.
 */
void
constty_clear(void)
{
	int c;

	constty = NULL;
	if (consbuf == NULL)
		return;
	callout_stop(&conscallout);
	while ((c = msgbuf_getchar(&consmsgbuf)) != -1)
		cnputc(c);
	free(consbuf, M_TTYCONS);
	consbuf = NULL;
}

/* Times per second to check for pending console tty messages. */
static int constty_wakeups_per_second = 5;