1  /* Global-scope DSO mapping test with a static executable (BZ #15022).
       2     Copyright (C) 2013-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #include <dlfcn.h>
      20  #include <stddef.h>
      21  #include <stdio.h>
      22  
      23  #define MAGIC0 0
      24  #define MAGIC1 0x5500ffaa
      25  #define MAGIC2 0xaaff0055
      26  
      27  /* Mapping a DSO into the global scope used to crash in static
      28     executables.  Check that it succeeds and then that symbols from
      29     the DSO can be accessed and operate as expected.  */
      30  static int
      31  do_test (void)
      32  {
      33    unsigned int (*getfoo) (void);
      34    void (*setfoo) (unsigned int);
      35    unsigned int *foop;
      36    unsigned int foo;
      37    void *handle;
      38  
      39    /* Try to map a module into the global scope.  */
      40    handle = dlopen ("modstatic3.so", RTLD_LAZY | RTLD_GLOBAL);
      41    if (handle == NULL)
      42      {
      43        printf ("dlopen (modstatic3.so): %s\n", dlerror ());
      44        return 1;
      45      }
      46  
      47    /* Get at its symbols.  */
      48    foop = dlsym (handle, "foo");
      49    if (foop == NULL)
      50      {
      51        printf ("dlsym (foo): %s\n", dlerror ());
      52        return 1;
      53      }
      54  
      55    getfoo = dlsym (handle, "getfoo");
      56    if (getfoo == NULL)
      57      {
      58        printf ("dlsym (getfoo): %s\n", dlerror ());
      59        return 1;
      60      }
      61  
      62    setfoo = dlsym (handle, "setfoo");
      63    if (setfoo == NULL)
      64      {
      65        printf ("dlsym (setfoo): %s\n", dlerror ());
      66        return 1;
      67      }
      68  
      69    /* Make sure the view of the initial state is consistent.  */
      70    foo = *foop;
      71    if (foo != MAGIC0)
      72      {
      73        printf ("*foop: got %#x, expected %#x\n", foo, MAGIC0);
      74        return 1;
      75      }
      76  
      77    foo = getfoo ();
      78    if (foo != MAGIC0)
      79      {
      80        printf ("getfoo: got %#x, expected %#x\n", foo, MAGIC0);
      81        return 1;
      82      }
      83  
      84    /* Likewise with one change to its state.  */
      85    setfoo (MAGIC1);
      86  
      87    foo = *foop;
      88    if (foo != MAGIC1)
      89      {
      90        printf ("*foop: got %#x, expected %#x\n", foo, MAGIC1);
      91        return 1;
      92      }
      93  
      94    foo = getfoo ();
      95    if (foo != MAGIC1)
      96      {
      97        printf ("getfoo: got %#x, expected %#x\n", foo, MAGIC1);
      98        return 1;
      99      }
     100  
     101    /* And with another.  */
     102    setfoo (MAGIC2);
     103  
     104    foo = *foop;
     105    if (foo != MAGIC2)
     106      {
     107        printf ("*foop: got %#x, expected %#x\n", foo, MAGIC2);
     108        return 1;
     109      }
     110  
     111    foo = getfoo ();
     112    if (foo != MAGIC2)
     113      {
     114        printf ("getfoo: got %#x, expected %#x\n", foo, MAGIC2);
     115        return 1;
     116      }
     117  
     118    /* All done, clean up.  */
     119    getfoo = NULL;
     120    setfoo = NULL;
     121    foop = NULL;
     122    dlclose (handle);
     123  
     124    return 0;
     125  }
     126  
     127  #define TEST_FUNCTION do_test ()
     128  #include "../test-skeleton.c"