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res_state.c revision 1.8 
      1 /*	$NetBSD: res_state.c,v 1.8 2009/01/11 02:46:29 christos 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_state.c,v 1.8 2009/01/11 02:46:29 christos 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 <resolv.h>
     42 
     43 struct __res_state _nres
     44 # if defined(__BIND_RES_TEXT)
     45 	= { .retrans = RES_TIMEOUT, }	/*%< Motorola, et al. */
     46 # endif
     47 	;
     48 
     49 res_state __res_get_state_nothread(void);
     50 void __res_put_state_nothread(res_state);
     51 
     52 #ifdef __weak_alias
     53 __weak_alias(__res_get_state, __res_get_state_nothread)
     54 __weak_alias(__res_put_state, __res_put_state_nothread)
     55 /* Source compatibility; only for single threaded programs */
     56 __weak_alias(__res_state, __res_get_state_nothread)
     57 #endif
     58 
     59 res_state
     60 __res_get_state_nothread(void)
     61 {
     62 	if ((_nres.options & RES_INIT) == 0 && res_ninit(&_nres) == -1) {
     63 		h_errno = NETDB_INTERNAL;
     64 		return NULL;
     65 	}
     66 	return &_nres;
     67 }
     68 
     69 void
     70 /*ARGSUSED*/
     71 __res_put_state_nothread(res_state res)
     72 {
     73 }
     74