VDC_LDC_CB
if (srvr->state & VDC_LDC_CB) {
srvr->state &= ~(VDC_LDC_INIT | VDC_LDC_CB | VDC_LDC_OPEN);
if ((srvr->state & VDC_LDC_CB) == 0) {
srvr->state |= VDC_LDC_CB;
#define VDC_LDC (VDC_LDC_INIT | VDC_LDC_CB | VDC_LDC_OPEN)