Symbol: CLAMP
sys/kern/tty.c
2117
tp->t_lowat = x = CLAMP(cps / 2, TTMAXLOWAT, TTMINLOWAT);
sys/kern/tty.c
2119
tp->t_hiwat = CLAMP(x, tp->t_outq.c_cn - TTHIWATMINSPACE, TTMINHIWAT);