1 | /* Copyright (C) 2003-2024 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. |
3 | |
4 | The GNU C Library is free software; you can redistribute it and/or |
5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either |
7 | version 2.1 of the License, or (at your option) any later version. |
8 | |
9 | The GNU C Library is distributed in the hope that it will be useful, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
12 | Lesser General Public License for more details. |
13 | |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library; if not, see |
16 | <https://www.gnu.org/licenses/>. */ |
17 | |
18 | /* Test whether _res in glibc 2.1.x and earlier (before __res_state() |
19 | was introduced) works. Portable programs should never do the |
20 | dirty things below. */ |
21 | |
22 | #include <pthread.h> |
23 | #include <resolv.h> |
24 | #include <stdlib.h> |
25 | #include <stdio.h> |
26 | |
27 | void *tf (void *resp) |
28 | { |
29 | if (resp == &_res || resp == __res_state ()) |
30 | abort (); |
31 | _res.retry = 24; |
32 | return NULL; |
33 | } |
34 | |
35 | void do_test (struct __res_state *resp) |
36 | { |
37 | if (resp != &_res || resp != __res_state ()) |
38 | abort (); |
39 | if (_res.retry != 12) |
40 | abort (); |
41 | } |
42 | |
43 | int main (void) |
44 | { |
45 | #undef _res |
46 | extern struct __res_state _res; |
47 | pthread_t th; |
48 | |
49 | _res.retry = 12; |
50 | if (pthread_create (newthread: &th, NULL, start_routine: tf, arg: &_res) != 0) |
51 | { |
52 | puts (s: "create failed" ); |
53 | exit (1); |
54 | } |
55 | |
56 | do_test (resp: &_res); |
57 | |
58 | if (pthread_join (th: th, NULL) != 0) |
59 | { |
60 | puts (s: "join failed" ); |
61 | exit (1); |
62 | } |
63 | |
64 | do_test (resp: &_res); |
65 | |
66 | exit (0); |
67 | } |
68 | |