diff --git a/libc/include/resolv.h b/libc/include/resolv.h
index 4247d68..bb21c23 100644
--- a/libc/include/resolv.h
+++ b/libc/include/resolv.h
@@ -34,6 +34,7 @@
 #include <sys/socket.h>
 #include <stdio.h>
 #include <arpa/nameser.h>
+#include <netinet/in.h>
 
 __BEGIN_DECLS
 
@@ -49,6 +50,21 @@
 extern int   b64_ntop(u_char const *, size_t, char *, size_t);
 extern int   b64_pton(char const *, u_char *, size_t);
 
+/* Set name of default interface */
+extern void _resolv_set_default_iface(const char* ifname);
+
+/* set name servers for an interface */
+extern void _resolv_set_nameservers_for_iface(const char* ifname, char** servers, int numservers);
+
+/* tell resolver of the address of an interface */
+extern void _resolv_set_addr_of_iface(const char* ifname, struct in_addr* addr);
+
+/* flush the cache associated with the default interface */
+extern void _resolv_flush_cache_for_default_iface();
+
+/* flush the cache associated with a certain interface */
+extern void _resolv_flush_cache_for_iface(const char* ifname);
+
 __END_DECLS
 
 #endif /* _RESOLV_H_ */