elf/tst-nodelete-opened.c

   1 /* Verify that an already opened DSO opened agained with RTLD_NODELETE actually
   2    sets the NODELETE flag.
   3
   4    Copyright (C) 2015-2023 Free Software Foundation, Inc.
   5    This file is part of the GNU C Library.
   6
   7    The GNU C Library is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU Lesser General Public
   9    License as published by the Free Software Foundation; either
  10    version 2.1 of the License, or (at your option) any later version.
  11
  12    The GNU C Library is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    Lesser General Public License for more details.
  16
  17    You should have received a copy of the GNU Lesser General Public
  18    License along with the GNU C Library; if not, see
  19    <https://www.gnu.org/licenses/>.  */
  20
  21 #include <dlfcn.h>
  22 #include <stdio.h>
  23
  24 int
  25 do_test (void)
  26 {
  27   void *h1 = dlopen ("$ORIGIN/tst-nodelete-opened-lib.so", RTLD_LAZY);
  28   if (h1 == NULL)
  29     {
  30       printf ("h1: failed to open DSO: %s\n", dlerror ());
  31       return 1;
  32     }
  33
  34   void *h2 = dlopen ("$ORIGIN/tst-nodelete-opened-lib.so",
  35                      RTLD_LAZY | RTLD_NODELETE);
  36   if (h2 == NULL)
  37     {
  38       printf ("h2: failed to open DSO: %s\n", dlerror ());
  39       return 1;
  40     }
  41
  42   int *foo = dlsym (h2, "foo_var");
  43   if (foo == NULL)
  44     {
  45       printf ("failed to load symbol foo_var: %s\n", dlerror ());
  46       return 1;
  47     }
  48
  49   if (dlclose (h1) != 0)
  50     {
  51       printf ("h1: dlclose failed: %s\n", dlerror ());
  52       return 1;
  53     }
  54
  55   if (dlclose (h2) != 0)
  56     {
  57       printf ("h2: dlclose failed: %s\n", dlerror ());
  58       return 1;
  59     }
  60
  61   /* This FOO dereference will crash with a segfault if the DSO was
  62      unloaded.  */
  63   printf ("foo == %d\n", *foo);
  64
  65   return 0;
  66 }
  67
  68 #include <support/test-driver.c>