ttyprintf
ttyprintf(tp, "load: %d.%02d ", tmp / 100, tmp % 100);
ttyprintf(tp, "not a controlling terminal\n");
ttyprintf(tp, "no foreground process group\n");
empty: ttyprintf(tp, "empty foreground process group\n");
ttyprintf(tp,
void ttyprintf(struct tty *, const char *, ...)