Initial Contribution
diff --git a/libc/resolv_cache.h b/libc/resolv_cache.h
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+++ b/libc/resolv_cache.h
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+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+#ifndef _RESOLV_CACHE_H_
+#define _RESOLV_CACHE_H_
+
+#include <netdb.h>
+
+const struct hostent _resolv_hostent_none;
+#define _RESOLV_HOSTENT_NONE ((struct hostent*)&_resolv_hostent_none)
+
+struct resolv_cache; /* forward */
+extern struct resolv_cache* __get_res_cache(void);
+extern struct hostent** __get_res_cache_hostent_p(void);
+
+extern struct resolv_cache* _resolv_cache_get( void );
+
+extern struct resolv_cache* _resolv_cache_create( void );
+
+extern void _resolv_cache_destroy( struct resolv_cache* cache );
+
+extern struct hostent* _resolv_cache_lookup( struct resolv_cache* cache,
+ const char* name,
+ int af );
+
+extern void _resolv_cache_add( struct resolv_cache* cache,
+ const char* name,
+ int af,
+ struct hostent* hp );
+
+extern struct hostent* _resolv_hostent_copy( struct hostent* hp );
+extern void _resolv_hostent_free( struct hostent* hp );
+
+#endif /* _RESOLV_CACHE_H_ */