Revert "dns cache per interface iteration 2"

This reverts commit f1464ff956

Change-Id: I3496b9a8cb54614fe3eea016d1391c8a89f3db38

libc/private/resolv_cache.h

@@ -28,13 +28,13 @@
 #ifndef _RESOLV_CACHE_H_
 #define _RESOLV_CACHE_H_
 
-struct __res_state;
 struct resolv_cache;  /* forward */
 
-/* gets the cache for an interface. Set ifname argument to NULL or
- * empty buffer ('\0') to get cache for default interface.
- * returned cache might be NULL*/
-extern struct resolv_cache*  __get_res_cache(const char* ifname);
+/* gets the cache for the default interface. Might be NULL*/
+extern struct resolv_cache*  __get_res_cache(void);
+
+/* get the cache for a specified interface. Can be NULL*/
+extern struct resolv_cache* __get_res_cache_for_iface(const char* ifname);
 
 /* this gets called everytime we detect some changes in the DNS configuration
  * and will flush the cache */
@@ -67,14 +67,8 @@ extern struct in_addr* _resolv_get_addr_of_default_iface();
 /* gets the address associated with the specified interface */
 extern struct in_addr* _resolv_get_addr_of_iface(const char* ifname);
 
-/* Copy the name of the default interface to provided buffer.
- * Return length of buffer on success on failure -1 is returned */
-extern int _resolv_get_default_iface(char* buff, int buffLen);
-
-/* sets the name server addresses to the provided res_state structure. The
- * name servers are retrieved from the cache which is associated
- * with the interface to which the res_state structure is associated */
-extern int _resolv_populate_res_for_iface(struct __res_state* statp);
+/* Get name of default interface */
+extern char* _resolv_get_default_iface();
 
 typedef enum {
     RESOLV_CACHE_UNSUPPORTED,  /* the cache can't handle that kind of queries */