lib/libc/resolv/res_compat.c

   1 /*      $NetBSD: res_compat.c,v 1.2 2008/04/28 20:23:00 martin 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 1.2 2008/04/28 20:23:00 martin 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