linuxthreads/tst-_res1.c

   1 /* Copyright (C) 2003 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Jakub Jelinek <jakub@redhat.com>, 2003.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 /* Test whether _res in glibc 2.1.x and earlier (before __res_state()
  21    was introduced) works.  Portable programs should never do the
  22    dirty things below.  */
  23
  24 #include <pthread.h>
  25 #include <resolv.h>
  26 #include <stdlib.h>
  27 #include <stdio.h>
  28
  29 void *tf (void *resp)
  30 {
  31   if (resp == &_res || resp == __res_state ())
  32     abort ();
  33   _res.retry = 24;
  34   return NULL;
  35 }
  36
  37 void do_test (struct __res_state *resp)
  38 {
  39   if (resp != &_res || resp != __res_state ())
  40     abort ();
  41   if (_res.retry != 12)
  42     abort ();
  43 }
  44
  45 int main (void)
  46 {
  47 #undef _res
  48   extern struct __res_state _res;
  49   pthread_t th;
  50
  51   _res.retry = 12;
  52   if (pthread_create (&th, NULL, tf, &_res) != 0)
  53     {
  54       puts ("create failed");
  55       exit (1);
  56     }
  57
  58   do_test (&_res);
  59
  60   if (pthread_join (th, NULL) != 0)
  61     {
  62       puts ("join failed");
  63       exit (1);
  64     }
  65
  66   do_test (&_res);
  67
  68   exit (0);
  69 }