/* Test the creation of many struct __res_state objects.

   Copyright (C) 2017-2018 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 <mcheck.h>

#include <resolv.h>

#include <resolv/resolv_context.h>

#include <stdlib.h>

#include <support/check.h>

/* Order the resolver states by their extended resolver state

   index.  */

static int

sort_res_state (const void *a, const void *b)

{

  res_state left = (res_state) a;

  res_state right = (res_state) b;

  return memcmp (&left->_u._ext.__glibc_extension_index,

                 &right->_u._ext.__glibc_extension_index,

                 sizeof (left->_u._ext.__glibc_extension_index));

}

static int

do_test (void)

{

  mtrace ();

  enum { count = 100 * 1000 };

  res_state array = calloc (count, sizeof (*array));

  const struct resolv_conf *conf = NULL;

  for (size_t i = 0; i < count; ++i)

    {

      TEST_VERIFY (res_ninit (array + i) == 0);

      TEST_VERIFY (array[i].nscount > 0);

      struct resolv_context *ctx = __resolv_context_get_override (array + i);

      TEST_VERIFY_EXIT (ctx != NULL);

      TEST_VERIFY (ctx->resp == array + i);

      if (i == 0)

        {

          conf = ctx->conf;

          TEST_VERIFY (conf != NULL);

        }

      else

        /* The underyling configuration should be identical across all

           res_state opjects because resolv.conf did not change.  */

        TEST_VERIFY (ctx->conf == conf);

    }

  qsort (array, count, sizeof (*array), sort_res_state);

  for (size_t i = 1; i < count; ++i)

    /* All extension indices should be different.  */

    TEST_VERIFY (sort_res_state (array + i - 1, array + i) < 0);

  for (size_t i = 0; i < count; ++i)

    res_nclose (array + i);

  free (array);

  TEST_VERIFY (res_init () == 0);

  return 0;

}

#define TIMEOUT 50

#include <support/test-driver.c>