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      1 /*	$NetBSD: res_compat.c,v 1.3 2009/11/22 18:04:37 mbalmer Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2004 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Christos Zoulas.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #if defined(LIBC_SCCS) && !defined(lint)
     34 __RCSID("$NetBSD: res_compat.c,v 1.3 2009/11/22 18:04:37 mbalmer Exp $");
     35 #endif
     36 
     37 #include <sys/types.h>
     38 #include <arpa/inet.h>
     39 #include <arpa/nameser.h>
     40 #include <netdb.h>
     41 #include <string.h>
     42 #define __OLD_RES_STATE
     43 #include <resolv.h>
     44 
     45 #undef _res
     46 
     47 /*
     48  * Binary Compatibility; this symbol does not appear in a header file
     49  * Most userland programs use this to set res_options before res_init()
     50  * is called. There are hooks to res_init() to consult the data in this
     51  * structure. The hooks are provided indirectly by the two functions below.
     52  * We depend on the fact the first 440 [32 bit machines] bytes are
     53  * shared between the two structures.
     54  */
     55 #ifndef __BIND_NOSTATIC
     56 struct __res_state _res
     57 #if defined(__BIND_RES_TEXT)
     58 	= { RES_TIMEOUT, }      /* Motorola, et al. */
     59 # endif
     60 ;
     61 
     62 void *__res_get_old_state(void);
     63 void __res_put_old_state(void *);
     64 
     65 void *
     66 __res_get_old_state(void)
     67 {
     68 	return &_res;
     69 }
     70 
     71 void
     72 __res_put_old_state(void *res)
     73 {
     74 	(void)memcpy(&_res, res, sizeof(_res));
     75 }
     76 #endif
     77