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1 | /* BZ #17977 _res_hconf_reorder_addrs test. |
2 | ||
688903eb | 3 | Copyright (C) 2015-2018 Free Software Foundation, Inc. |
b57525f1 DL |
4 | This file is part of the GNU C Library. |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
7 | modify it under the terms of the GNU Lesser General Public | |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
10 | ||
11 | The GNU C Library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public | |
17 | License along with the GNU C Library; if not, see | |
18 | <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #include <errno.h> | |
21 | #include <stdio.h> | |
ceaa9889 | 22 | #include <stdlib.h> |
b57525f1 DL |
23 | #include <string.h> |
24 | #include <time.h> | |
25 | #include <dlfcn.h> | |
26 | #include <pthread.h> | |
27 | #include <netdb.h> | |
28 | #include <netinet/in.h> | |
29 | #include <sys/socket.h> | |
30 | ||
31 | static struct timespec ts; | |
32 | ||
33 | /* The first thread that gets a lock in _res_hconf_reorder_addrs() | |
34 | should hold the lock long enough to make two other threads blocked. | |
35 | This is achieved by slowing down realloc(3) that is called several times | |
36 | by _res_hconf_reorder_addrs(). */ | |
37 | ||
38 | void * | |
39 | realloc (void *ptr, size_t len) | |
40 | { | |
41 | static void *(*fun) (void *, size_t); | |
42 | ||
43 | if (!fun) | |
44 | fun = dlsym (RTLD_NEXT, "realloc"); | |
45 | ||
46 | if (ts.tv_nsec) | |
47 | nanosleep (&ts, NULL); | |
48 | ||
49 | return (*fun) (ptr, len); | |
50 | } | |
51 | ||
52 | static void * | |
53 | resolve (void *arg) | |
54 | { | |
55 | struct in_addr addr; | |
56 | struct hostent ent; | |
57 | struct hostent *result; | |
58 | int err; | |
59 | char buf[1024]; | |
60 | ||
61 | addr.s_addr = htonl (INADDR_LOOPBACK); | |
62 | (void) gethostbyaddr_r ((void *) &addr, sizeof (addr), AF_INET, | |
63 | &ent, buf, sizeof (buf), &result, &err); | |
64 | return arg; | |
65 | } | |
66 | ||
67 | static int | |
68 | do_test (void) | |
69 | { | |
70 | #define N 3 | |
71 | pthread_t thr[N]; | |
72 | unsigned int i; | |
73 | int result = 0; | |
74 | ||
75 | /* turn on realloc slowdown */ | |
76 | ts.tv_nsec = 100000000; | |
77 | ||
78 | for (i = 0; i < N; ++i) | |
79 | { | |
80 | int rc = pthread_create (&thr[i], NULL, resolve, NULL); | |
81 | ||
82 | if (rc) | |
83 | { | |
84 | printf ("pthread_create: %s\n", strerror(rc)); | |
85 | exit (1); | |
86 | } | |
87 | } | |
88 | ||
89 | for (i = 0; i < N; ++i) | |
90 | { | |
91 | void *retval; | |
92 | int rc = pthread_join (thr[i], &retval); | |
93 | ||
94 | if (rc) | |
95 | { | |
96 | printf ("pthread_join: %s\n", strerror(rc)); | |
97 | exit (1); | |
98 | } | |
99 | if (retval) | |
100 | { | |
101 | printf ("thread %u exit status %p\n", i, retval); | |
102 | result = 1; | |
103 | } | |
104 | } | |
105 | ||
106 | /* turn off realloc slowdown, no longer needed */ | |
107 | ts.tv_nsec = 0; | |
108 | ||
109 | return result; | |
110 | } | |
111 | ||
112 | #define TEST_FUNCTION do_test () | |
113 | #include "../test-skeleton.c" |