// setting both to negative values should pragmatically leave the
	// TCP_KEEPALIVE_ABORT_THRESHOLD unchanged.
	abortIdle := int(roundDurationUp(interval, time.Millisecond)) * count
	if abortIdle < 0 {
		return syscall.ENOPROTOOPT
	}
	if interval < 0 && count < 0 {
		abortIdle = -1
	}

	if abortIdle > 0 {
		// Note that the consequent probes will not be sent at equal intervals on Solaris,