PRU_SLOWTIMO
if ((req & 0xff) == PRU_SLOWTIMO)
PRU_SLOWTIMO | (TCPT_REXMT << 8));
PRU_SLOWTIMO | (TCPT_PERSIST << 8));
PRU_SLOWTIMO | (TCPT_KEEP << 8));
PRU_SLOWTIMO | (TCPT_2MSL << 8));
if (req == PRU_SLOWTIMO || req == PRU_FASTTIMO)