elf/tst-noload.c

   1 /* Verify that RTLD_NOLOAD works as expected.
   2
   3    Copyright (C) 2016-2024 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>