--- /dev/null
+#ifndef MSP_NET_CONSTANTS_H_
+#define MSP_NET_CONSTANTS_H_
+
+namespace Msp {
+namespace Net {
+
+enum Family
+{
+ UNSPEC,
+ INET,
+ INET6,
+ UNIX
+};
+
+int family_to_sys(Family);
+Family family_from_sys(int);
+
+} // namespace Net
+} // namespace Msp
+
+#endif