1*86d7f5d3SJohn Marino /*-
2*86d7f5d3SJohn Marino * Copyright (c) 2006 The FreeBSD Project. All rights reserved.
3*86d7f5d3SJohn Marino *
4*86d7f5d3SJohn Marino * Redistribution and use in source and binary forms, with or without
5*86d7f5d3SJohn Marino * modification, are permitted provided that the following conditions
6*86d7f5d3SJohn Marino * are met:
7*86d7f5d3SJohn Marino * 1. Redistributions of source code must retain the above copyright
8*86d7f5d3SJohn Marino * notice, this list of conditions and the following disclaimer.
9*86d7f5d3SJohn Marino * 2. Redistributions in binary form must reproduce the above copyright
10*86d7f5d3SJohn Marino * notice, this list of conditions and the following disclaimer in the
11*86d7f5d3SJohn Marino * documentation and/or other materials provided with the distribution.
12*86d7f5d3SJohn Marino *
13*86d7f5d3SJohn Marino * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14*86d7f5d3SJohn Marino * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15*86d7f5d3SJohn Marino * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16*86d7f5d3SJohn Marino * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
17*86d7f5d3SJohn Marino * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18*86d7f5d3SJohn Marino * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19*86d7f5d3SJohn Marino * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20*86d7f5d3SJohn Marino * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21*86d7f5d3SJohn Marino * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22*86d7f5d3SJohn Marino * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23*86d7f5d3SJohn Marino * SUCH DAMAGE.
24*86d7f5d3SJohn Marino *
25*86d7f5d3SJohn Marino * $FreeBSD: src/lib/libc/resolv/res_state.c,v 1.3 2006/05/21 11:29:26 ume Exp $
26*86d7f5d3SJohn Marino */
27*86d7f5d3SJohn Marino
28*86d7f5d3SJohn Marino #include <sys/types.h>
29*86d7f5d3SJohn Marino #include <netinet/in.h>
30*86d7f5d3SJohn Marino #include <arpa/nameser.h>
31*86d7f5d3SJohn Marino #include <resolv.h>
32*86d7f5d3SJohn Marino #include <stdlib.h>
33*86d7f5d3SJohn Marino
34*86d7f5d3SJohn Marino #include "namespace.h"
35*86d7f5d3SJohn Marino #include "reentrant.h"
36*86d7f5d3SJohn Marino #include "un-namespace.h"
37*86d7f5d3SJohn Marino
38*86d7f5d3SJohn Marino #undef _res
39*86d7f5d3SJohn Marino
40*86d7f5d3SJohn Marino struct __res_state _res;
41*86d7f5d3SJohn Marino
42*86d7f5d3SJohn Marino static thread_key_t res_key;
43*86d7f5d3SJohn Marino static once_t res_init_once = ONCE_INITIALIZER;
44*86d7f5d3SJohn Marino static int res_thr_keycreated = 0;
45*86d7f5d3SJohn Marino
46*86d7f5d3SJohn Marino static void
free_res(void * ptr)47*86d7f5d3SJohn Marino free_res(void *ptr)
48*86d7f5d3SJohn Marino {
49*86d7f5d3SJohn Marino res_state statp = ptr;
50*86d7f5d3SJohn Marino
51*86d7f5d3SJohn Marino if (statp->_u._ext.ext != NULL)
52*86d7f5d3SJohn Marino res_ndestroy(statp);
53*86d7f5d3SJohn Marino free(statp);
54*86d7f5d3SJohn Marino }
55*86d7f5d3SJohn Marino
56*86d7f5d3SJohn Marino static void
res_keycreate(void)57*86d7f5d3SJohn Marino res_keycreate(void)
58*86d7f5d3SJohn Marino {
59*86d7f5d3SJohn Marino res_thr_keycreated = thr_keycreate(&res_key, free_res) == 0;
60*86d7f5d3SJohn Marino }
61*86d7f5d3SJohn Marino
62*86d7f5d3SJohn Marino res_state
__res_state(void)63*86d7f5d3SJohn Marino __res_state(void)
64*86d7f5d3SJohn Marino {
65*86d7f5d3SJohn Marino res_state statp;
66*86d7f5d3SJohn Marino
67*86d7f5d3SJohn Marino if (thr_main() != 0)
68*86d7f5d3SJohn Marino return (&_res);
69*86d7f5d3SJohn Marino
70*86d7f5d3SJohn Marino if (thr_once(&res_init_once, res_keycreate) != 0 ||
71*86d7f5d3SJohn Marino !res_thr_keycreated)
72*86d7f5d3SJohn Marino return (&_res);
73*86d7f5d3SJohn Marino
74*86d7f5d3SJohn Marino statp = thr_getspecific(res_key);
75*86d7f5d3SJohn Marino if (statp != NULL)
76*86d7f5d3SJohn Marino return (statp);
77*86d7f5d3SJohn Marino statp = calloc(1, sizeof(*statp));
78*86d7f5d3SJohn Marino if (statp == NULL)
79*86d7f5d3SJohn Marino return (&_res);
80*86d7f5d3SJohn Marino #ifdef __BIND_RES_TEXT
81*86d7f5d3SJohn Marino statp->options = RES_TIMEOUT; /* Motorola, et al. */
82*86d7f5d3SJohn Marino #endif
83*86d7f5d3SJohn Marino if (thr_setspecific(res_key, statp) == 0)
84*86d7f5d3SJohn Marino return (statp);
85*86d7f5d3SJohn Marino free(statp);
86*86d7f5d3SJohn Marino return (&_res);
87*86d7f5d3SJohn Marino }
88