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1/* Copyright (C) 2003-2019 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Jakub Jelinek <jakub@redhat.com>, 2003.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
18
19/* Test whether _res in glibc 2.1.x and earlier (before __res_state()
20 was introduced) works. Portable programs should never do the
21 dirty things below. */
22
23#include <pthread.h>
24#include <resolv.h>
25#include <stdlib.h>
26#include <stdio.h>
27
28void *tf (void *resp)
29{
30 if (resp == &_res || resp == __res_state ())
31 abort ();
32 _res.retry = 24;
33 return NULL;
34}
35
36void do_test (struct __res_state *resp)
37{
38 if (resp != &_res || resp != __res_state ())
39 abort ();
40 if (_res.retry != 12)
41 abort ();
42}
43
44int main (void)
45{
46#undef _res
47 extern struct __res_state _res;
48 pthread_t th;
49
50 _res.retry = 12;
51 if (pthread_create (&th, NULL, tf, &_res) != 0)
52 {
53 puts ("create failed");
54 exit (1);
55 }
56
57 do_test (&_res);
58
59 if (pthread_join (th, NULL) != 0)
60 {
61 puts ("join failed");
62 exit (1);
63 }
64
65 do_test (&_res);
66
67 exit (0);
68}
69

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