1  /* Verify that RTLD_NOLOAD works as expected.
       2  
       3     Copyright (C) 2016-2023 Free Software Foundation, Inc.
       4     This file is part of the GNU C Library.
       5  
       6     The GNU C Library is free software; you can redistribute it and/or
       7     modify it under the terms of the GNU Lesser General Public
       8     License as published by the Free Software Foundation; either
       9     version 2.1 of the License, or (at your option) any later version.
      10  
      11     The GNU C Library is distributed in the hope that it will be useful,
      12     but WITHOUT ANY WARRANTY; without even the implied warranty of
      13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      14     Lesser General Public License for more details.
      15  
      16     You should have received a copy of the GNU Lesser General Public
      17     License along with the GNU C Library; if not, see
      18     <https://www.gnu.org/licenses/>.  */
      19  
      20  #include <dlfcn.h>
      21  #include <stdio.h>
      22  #include <gnu/lib-names.h>
      23  
      24  static int
      25  do_test (void)
      26  {
      27    /* Test that no object is loaded with RTLD_NOLOAD.  */
      28    void *h1 = dlopen (LIBM_SO, RTLD_LAZY | RTLD_NOLOAD);
      29    if (h1 != NULL)
      30      {
      31        printf ("h1: DSO has been loaded while it should have not\n");
      32        return 1;
      33      }
      34  
      35    /* This used to segfault in some glibc versions.  */
      36    void *h2 = dlopen (LIBM_SO, RTLD_LAZY | RTLD_NOLOAD | RTLD_NODELETE);
      37    if (h2 != NULL)
      38      {
      39        printf ("h2: DSO has been loaded while it should have not\n");
      40        return 1;
      41      }
      42  
      43    /* Test that loading an already loaded object returns the same.  */
      44    void *h3 = dlopen (LIBM_SO, RTLD_LAZY);
      45    if (h3 == NULL)
      46      {
      47        printf ("h3: failed to open DSO: %s\n", dlerror ());
      48        return 1;
      49      }
      50    void *h4 = dlopen (LIBM_SO, RTLD_LAZY | RTLD_NOLOAD);
      51    if (h4 == NULL)
      52      {
      53        printf ("h4: failed to open DSO: %s\n", dlerror ());
      54        return 1;
      55      }
      56    if (h4 != h3)
      57      {
      58        printf ("h4: should return the same object\n");
      59        return 1;
      60      }
      61  
      62    /* Cleanup */
      63    if (dlclose (h3) != 0)
      64      {
      65        printf ("h3: dlclose failed: %s\n", dlerror ());
      66        return 1;
      67      }
      68  
      69    return 0;
      70  }
      71  
      72  #include <support/test-driver.c>