1  /* Check that dlfcn errors are reported properly after dlmopen.  Test module.
       2     Copyright (C) 2021-2023 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     <http://www.gnu.org/licenses/>.  */
      18  
      19  #include <dlfcn.h>
      20  #include <stddef.h>
      21  #include <stdio.h>
      22  #include <string.h>
      23  #include <support/check.h>
      24  
      25  /* Note: This object is not linked into the main program, so we cannot
      26     use delayed test failure reporting via TEST_VERIFY etc., and have
      27     to use FAIL_EXIT1 (or something else that calls exit).  */
      28  
      29  void
      30  call_dlsym (const char *name)
      31  {
      32    void *ptr = dlsym (NULL, name);
      33    if (ptr != NULL)
      34      FAIL_EXIT1 ("dlsym did not fail as expected for: %s", name);
      35    const char *message = dlerror ();
      36    if (strstr (message, ": undefined symbol: does not exist X") == NULL)
      37      FAIL_EXIT1 ("invalid dlsym error message for [[%s]]: %s", name, message);
      38    message = dlerror ();
      39    if (message != NULL)
      40      FAIL_EXIT1 ("second dlsym for [[%s]]: %s", name, message);
      41  }
      42  
      43  void
      44  call_dlopen (const char *name)
      45  {
      46    void *handle = dlopen (name, RTLD_NOW);
      47    if (handle != NULL)
      48      FAIL_EXIT1 ("dlopen did not fail as expected for: %s", name);
      49    const char *message = dlerror ();
      50    if (strstr (message, "X: cannot open shared object file:"
      51                " No such file or directory") == NULL
      52        && strstr (message, "X: cannot open shared object file:"
      53                   " File name too long") == NULL)
      54      FAIL_EXIT1 ("invalid dlopen error message for [[%s]]: %s", name, message);
      55    message = dlerror ();
      56    if (message != NULL)
      57      FAIL_EXIT1 ("second dlopen for [[%s]]: %s", name, message);
      58  }