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/* Multi-threaded test for resolver initialization.
Copyright (C) 2017-2023 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
<https://www.gnu.org/licenses/>. */
#include <netdb.h>
#include <resolv.h>
#include <stdlib.h>
#include <support/check.h>
#include <support/support.h>
#include <support/xthread.h>
/* Whether name lookups succeed does not really matter. We use this
to trigger initialization of the resolver. */
static const char *test_hostname = "www.gnu.org";
/* The different initialization methods. */
enum test_type { init, byname, gai };
enum { type_count = 3 };
/* Thread function. Perform a few resolver options. */
static void *
thread_func (void *closure)
{
enum test_type *ptype = closure;
/* Perform a few calls to the requested operation. */
TEST_VERIFY (*ptype >= 0);
TEST_VERIFY (*ptype < (int) type_count);
for (int i = 0; i < 3; ++i)
switch (*ptype)
{
case init:
res_init ();
break;
case byname:
gethostbyname (test_hostname);
break;
case gai:
{
struct addrinfo hints = { 0, };
struct addrinfo *ai = NULL;
if (getaddrinfo (test_hostname, "80", &hints, &ai) == 0)
freeaddrinfo (ai);
}
break;
}
free (ptype);
return NULL;
}
static int
do_test (void)
{
/* Start a small number of threads which perform resolver
operations. */
enum { thread_count = 30 };
pthread_t threads[thread_count];
for (int i = 0; i < thread_count; ++i)
{
enum test_type *ptype = xmalloc (sizeof (*ptype));
*ptype = i % type_count;
threads[i] = xpthread_create (NULL, thread_func, ptype);
}
for (int i = 0; i < type_count; ++i)
{
enum test_type *ptype = xmalloc (sizeof (*ptype));
*ptype = i;
thread_func (ptype);
}
for (int i = 0; i < thread_count; ++i)
xpthread_join (threads[i]);
return 0;
}
#include <support/test-driver.c>
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