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/* Copyright (C) 2003-2021 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/>. */
/* Test whether _res in glibc 2.1.x and earlier (before __res_state()
was introduced) works. Portable programs should never do the
dirty things below. */
#include <pthread.h>
#include <resolv.h>
#include <stdlib.h>
#include <stdio.h>
void *tf (void *resp)
{
if (resp == &_res || resp == __res_state ())
abort ();
_res.retry = 24;
return NULL;
}
void do_test (struct __res_state *resp)
{
if (resp != &_res || resp != __res_state ())
abort ();
if (_res.retry != 12)
abort ();
}
int main (void)
{
#undef _res
extern struct __res_state _res;
pthread_t th;
_res.retry = 12;
if (pthread_create (&th, NULL, tf, &_res) != 0)
{
puts ("create failed");
exit (1);
}
do_test (&_res);
if (pthread_join (th, NULL) != 0)
{
puts ("join failed");
exit (1);
}
do_test (&_res);
exit (0);
}
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