1 | /* Multi-threaded test for resolver initialization. |
2 | Copyright (C) 2017-2022 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. |
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 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <netdb.h> |
20 | #include <resolv.h> |
21 | #include <stdlib.h> |
22 | #include <support/check.h> |
23 | #include <support/support.h> |
24 | #include <support/xthread.h> |
25 | |
26 | /* Whether name lookups succeed does not really matter. We use this |
27 | to trigger initialization of the resolver. */ |
28 | static const char *test_hostname = "www.gnu.org" ; |
29 | |
30 | /* The different initialization methods. */ |
31 | enum test_type { init, byname, gai }; |
32 | enum { type_count = 3 }; |
33 | |
34 | /* Thread function. Perform a few resolver options. */ |
35 | static void * |
36 | thread_func (void *closure) |
37 | { |
38 | enum test_type *ptype = closure; |
39 | /* Perform a few calls to the requested operation. */ |
40 | TEST_VERIFY (*ptype >= 0); |
41 | TEST_VERIFY (*ptype < (int) type_count); |
42 | for (int i = 0; i < 3; ++i) |
43 | switch (*ptype) |
44 | { |
45 | case init: |
46 | res_init (); |
47 | break; |
48 | case byname: |
49 | gethostbyname (name: test_hostname); |
50 | break; |
51 | case gai: |
52 | { |
53 | struct addrinfo hints = { 0, }; |
54 | struct addrinfo *ai = NULL; |
55 | if (getaddrinfo (name: test_hostname, service: "80" , req: &hints, pai: &ai) == 0) |
56 | freeaddrinfo (ai: ai); |
57 | } |
58 | break; |
59 | } |
60 | free (ptr: ptype); |
61 | return NULL; |
62 | } |
63 | |
64 | static int |
65 | do_test (void) |
66 | { |
67 | /* Start a small number of threads which perform resolver |
68 | operations. */ |
69 | enum { thread_count = 30 }; |
70 | |
71 | pthread_t threads[thread_count]; |
72 | for (int i = 0; i < thread_count; ++i) |
73 | { |
74 | enum test_type *ptype = xmalloc (n: sizeof (*ptype)); |
75 | *ptype = i % type_count; |
76 | threads[i] = xpthread_create (NULL, thread_func, closure: ptype); |
77 | } |
78 | for (int i = 0; i < type_count; ++i) |
79 | { |
80 | enum test_type *ptype = xmalloc (n: sizeof (*ptype)); |
81 | *ptype = i; |
82 | thread_func (closure: ptype); |
83 | } |
84 | for (int i = 0; i < thread_count; ++i) |
85 | xpthread_join (thr: threads[i]); |
86 | return 0; |
87 | } |
88 | |
89 | #include <support/test-driver.c> |
90 | |