LISTSVR_IPV6_V
req->reply_ctrl = htons(NO_REPLY_V(0) | (ipv6 ? LISTSVR_IPV6_V(1) :
LISTSVR_IPV6_V(0)) | QUEUENO_V(queue));
#define LISTSVR_IPV6_F LISTSVR_IPV6_V(1U)