68 lines
1.6 KiB
C
68 lines
1.6 KiB
C
/* Copyright (C) 2003-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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/* Test whether _res in glibc 2.1.x and earlier (before __res_state()
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was introduced) works. Portable programs should never do the
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dirty things below. */
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#include <pthread.h>
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#include <resolv.h>
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#include <stdlib.h>
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#include <stdio.h>
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void *tf (void *resp)
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{
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if (resp == &_res || resp == __res_state ())
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abort ();
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_res.retry = 24;
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return NULL;
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}
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void do_test (struct __res_state *resp)
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{
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if (resp != &_res || resp != __res_state ())
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abort ();
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if (_res.retry != 12)
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abort ();
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}
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int main (void)
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{
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#undef _res
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extern struct __res_state _res;
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pthread_t th;
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_res.retry = 12;
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if (pthread_create (&th, NULL, tf, &_res) != 0)
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{
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puts ("create failed");
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exit (1);
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}
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do_test (&_res);
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if (pthread_join (th, NULL) != 0)
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{
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puts ("join failed");
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exit (1);
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}
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do_test (&_res);
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exit (0);
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}
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