auto import from //depot/cupcake/@135843
diff --git a/libc/netbsd/resolv/res_state.c b/libc/netbsd/resolv/res_state.c
new file mode 100644
index 0000000..3a2301d
--- /dev/null
+++ b/libc/netbsd/resolv/res_state.c
@@ -0,0 +1,185 @@
+/*
+ * 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.
+ */
+#include <sys/cdefs.h>
+#include <sys/types.h>
+#include <arpa/inet.h>
+#include "arpa_nameser.h"
+#include <netdb.h>
+#include "resolv_private.h"
+#include "resolv_cache.h"
+#include <pthread.h>
+#include <stdlib.h>
+
+#define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_
+#include <sys/_system_properties.h>
+
+static pthread_key_t _res_key;
+static pthread_once_t _res_once;
+
+typedef struct {
+ int _h_errno;
+ struct __res_state _nres[1];
+ unsigned _serial;
+ struct prop_info* _pi;
+ struct res_static _rstatic[1];
+} _res_thread;
+
+static _res_thread*
+_res_thread_alloc(void)
+{
+ _res_thread* rt = malloc(sizeof(*rt));
+
+ if (rt) {
+ rt->_h_errno = 0;
+ /* Special system property which tracks any changes to 'net.*'. */
+ rt->_serial = 0;
+ rt->_pi = (struct prop_info*) __system_property_find("net.change");
+ if (rt->_pi) {
+ rt->_serial = rt->_pi->serial;
+ }
+ if ( res_ninit( rt->_nres ) < 0 ) {
+ free(rt);
+ rt = NULL;
+ } else {
+ memset(rt->_rstatic, 0, sizeof rt->_rstatic);
+ }
+ }
+ return rt;
+}
+
+static void
+_res_static_done( res_static rs )
+{
+ /* fortunately, there is nothing to do here, since the
+ * points in h_addr_ptrs and host_aliases should all
+ * point to 'hostbuf'
+ */
+ if (rs->hostf) { /* should not happen in theory, but just be safe */
+ fclose(rs->hostf);
+ rs->hostf = NULL;
+ }
+ free(rs->servent.s_aliases);
+}
+
+static void
+_res_thread_free( void* _rt )
+{
+ _res_thread* rt = _rt;
+
+ _res_static_done(rt->_rstatic);
+ res_ndestroy(rt->_nres);
+ free(rt);
+}
+
+static void
+_res_init_key( void )
+{
+ pthread_key_create( &_res_key, _res_thread_free );
+}
+
+static _res_thread*
+_res_thread_get(void)
+{
+ _res_thread* rt;
+ pthread_once( &_res_once, _res_init_key );
+ rt = pthread_getspecific( _res_key );
+ if (rt == NULL) {
+ if ((rt = _res_thread_alloc()) == NULL) {
+ return NULL;
+ }
+ rt->_h_errno = 0;
+ rt->_serial = 0;
+ pthread_setspecific( _res_key, rt );
+ }
+ /* Check the serial value for any chanes to net.* properties. */
+ if (rt->_pi == NULL) {
+ rt->_pi = (struct prop_info*) __system_property_find("net.change");
+ }
+ if (rt->_pi == NULL || rt->_serial == rt->_pi->serial) {
+ return rt;
+ }
+ rt->_serial = rt->_pi->serial;
+ /* Reload from system properties. */
+ if ( res_ninit( rt->_nres ) < 0 ) {
+ free(rt);
+ rt = NULL;
+ pthread_setspecific( _res_key, rt );
+ }
+ _resolv_cache_reset(rt->_serial);
+ return rt;
+}
+
+struct __res_state _nres;
+
+#if 0
+struct resolv_cache*
+__get_res_cache(void)
+{
+ _res_thread* rt = _res_thread_get();
+
+ if (!rt)
+ return NULL;
+
+ if (!rt->_cache) {
+ rt->_cache = _resolv_cache_create();
+ }
+ return rt->_cache;
+}
+#endif
+
+int*
+__get_h_errno(void)
+{
+ _res_thread* rt = _res_thread_get();
+ static int panic = NETDB_INTERNAL;
+
+ return rt ? &rt->_h_errno : &panic;
+}
+
+res_state
+__res_get_state(void)
+{
+ _res_thread* rt = _res_thread_get();
+
+ return rt ? rt->_nres : NULL;
+}
+
+void
+__res_put_state(res_state res)
+{
+ /* nothing to do */
+ res=res;
+}
+
+res_static
+__res_get_static(void)
+{
+ _res_thread* rt = _res_thread_get();
+
+ return rt ? rt->_rstatic : NULL;
+}