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glibc/resolv/tst-res_hconf_reorder.c
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/* BZ #17977 _res_hconf_reorder_addrs test. | |
Copyright (C) 2015-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#include <errno.h> | |
#include <stdio.h> | |
#include <string.h> | |
#include <time.h> | |
#include <dlfcn.h> | |
#include <pthread.h> | |
#include <netdb.h> | |
#include <netinet/in.h> | |
#include <sys/socket.h> | |
static struct timespec ts; | |
/* The first thread that gets a lock in _res_hconf_reorder_addrs() | |
should hold the lock long enough to make two other threads blocked. | |
This is achieved by slowing down realloc(3) that is called several times | |
by _res_hconf_reorder_addrs(). */ | |
void * | |
realloc (void *ptr, size_t len) | |
{ | |
static void *(*fun) (void *, size_t); | |
if (!fun) | |
fun = dlsym (RTLD_NEXT, "realloc"); | |
if (ts.tv_nsec) | |
nanosleep (&ts, NULL); | |
return (*fun) (ptr, len); | |
} | |
static void * | |
resolve (void *arg) | |
{ | |
struct in_addr addr; | |
struct hostent ent; | |
struct hostent *result; | |
int err; | |
char buf[1024]; | |
addr.s_addr = htonl (INADDR_LOOPBACK); | |
(void) gethostbyaddr_r ((void *) &addr, sizeof (addr), AF_INET, | |
&ent, buf, sizeof (buf), &result, &err); | |
return arg; | |
} | |
static int | |
do_test (void) | |
{ | |
#define N 3 | |
pthread_t thr[N]; | |
unsigned int i; | |
int result = 0; | |
/* turn on realloc slowdown */ | |
ts.tv_nsec = 100000000; | |
for (i = 0; i < N; ++i) | |
{ | |
int rc = pthread_create (&thr[i], NULL, resolve, NULL); | |
if (rc) | |
{ | |
printf ("pthread_create: %s\n", strerror(rc)); | |
exit (1); | |
} | |
} | |
for (i = 0; i < N; ++i) | |
{ | |
void *retval; | |
int rc = pthread_join (thr[i], &retval); | |
if (rc) | |
{ | |
printf ("pthread_join: %s\n", strerror(rc)); | |
exit (1); | |
} | |
if (retval) | |
{ | |
printf ("thread %u exit status %p\n", i, retval); | |
result = 1; | |
} | |
} | |
/* turn off realloc slowdown, no longer needed */ | |
ts.tv_nsec = 0; | |
return result; | |
} | |
#define TEST_FUNCTION do_test () | |
#include "../test-skeleton.c" |