M_KEEPALIVEIDLE
#define G_KEEPALIVEIDLE(x) (((x) >> S_KEEPALIVEIDLE) & M_KEEPALIVEIDLE)
#define G_KEEPALIVEIDLE(x) (((x) >> S_KEEPALIVEIDLE) & M_KEEPALIVEIDLE)
v &= M_KEEPALIVEIDLE;
V_KEEPALIVEIDLE(M_KEEPALIVEIDLE), V_KEEPALIVEIDLE(v));