+/*
+ * Which address family this address belongs to. AF_INET for IPv4;
+ * AF_INET6 for IPv6; AF_UNSPEC indicates that name resolution has
+ * not been done and a simple host name is held in this SockAddr
+ * structure.
+ */
+#ifndef NO_IPV6
+#define SOCKADDR_FAMILY(addr, step) \
+ ((addr)->superfamily == UNRESOLVED ? AF_UNSPEC : \
+ (addr)->superfamily == UNIX ? AF_UNIX : \
+ (step).ai ? (step).ai->ai_family : AF_INET)
+#else
+#define SOCKADDR_FAMILY(addr, step) \
+ ((addr)->superfamily == UNRESOLVED ? AF_UNSPEC : \
+ (addr)->superfamily == UNIX ? AF_UNIX : AF_INET)
+#endif
+
+/*
+ * Start a SockAddrStep structure to step through multiple
+ * addresses.
+ */
+#ifndef NO_IPV6
+#define START_STEP(addr, step) \
+ ((step).ai = (addr)->ais, (step).curraddr = 0)
+#else
+#define START_STEP(addr, step) \
+ ((step).curraddr = 0)
+#endif
+