/* Verify that RTLD_NOLOAD works as expected.

   Copyright (C) 2016-2018 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 <dlfcn.h>

#include <stdio.h>

#include <gnu/lib-names.h>

static int

do_test (void)

{

  /* Test that no object is loaded with RTLD_NOLOAD.  */

  void *h1 = dlopen (LIBM_SO, RTLD_LAZY | RTLD_NOLOAD);

  if (h1 != NULL)

    {

      printf ("h1: DSO has been loaded while it should have not\n");

      return 1;

    }

  /* This used to segfault in some glibc versions.  */

  void *h2 = dlopen (LIBM_SO, RTLD_LAZY | RTLD_NOLOAD | RTLD_NODELETE);

  if (h2 != NULL)

    {

      printf ("h2: DSO has been loaded while it should have not\n");

      return 1;

    }

  /* Test that loading an already loaded object returns the same.  */

  void *h3 = dlopen (LIBM_SO, RTLD_LAZY);

  if (h3 == NULL)

    {

      printf ("h3: failed to open DSO: %s\n", dlerror ());

      return 1;

    }

  void *h4 = dlopen (LIBM_SO, RTLD_LAZY | RTLD_NOLOAD);

  if (h4 == NULL)

    {

      printf ("h4: failed to open DSO: %s\n", dlerror ());

      return 1;

    }

  if (h4 != h3)

    {

      printf ("h4: should return the same object\n");

      return 1;

    }

  /* Cleanup */

  if (dlclose (h3) != 0)

    {

      printf ("h3: dlclose failed: %s\n", dlerror ());

      return 1;

    }

  return 0;

}

#include <support/test-driver.c>