glibc/elf/tst-dlmopen-dlerror-mod.c

/* Check that dlfcn errors are reported properly after dlmopen.  Test module.
   Copyright (C) 2021-2023 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#include <dlfcn.h>
#include <stddef.h>
#include <stdio.h>
#include <string.h>
#include <support/check.h>

/* Note: This object is not linked into the main program, so we cannot
   use delayed test failure reporting via TEST_VERIFY etc., and have
   to use FAIL_EXIT1 (or something else that calls exit).  */

void
call_dlsym (const char *name)
{
  void *ptr = dlsym (NULL, name);
  if (ptr != NULL)
    FAIL_EXIT1 ("dlsym did not fail as expected for: %s", name);
  const char *message = dlerror ();
  if (strstr (message, ": undefined symbol: does not exist X") == NULL)
    FAIL_EXIT1 ("invalid dlsym error message for [[%s]]: %s", name, message);
  message = dlerror ();
  if (message != NULL)
    FAIL_EXIT1 ("second dlsym for [[%s]]: %s", name, message);
}

void
call_dlopen (const char *name)
{
  void *handle = dlopen (name, RTLD_NOW);
  if (handle != NULL)
    FAIL_EXIT1 ("dlopen did not fail as expected for: %s", name);
  const char *message = dlerror ();
  if (strstr (message, "X: cannot open shared object file:"
              " No such file or directory") == NULL
      && strstr (message, "X: cannot open shared object file:"
                 " File name too long") == NULL)
    FAIL_EXIT1 ("invalid dlopen error message for [[%s]]: %s", name, message);
  message = dlerror ();
  if (message != NULL)
    FAIL_EXIT1 ("second dlopen for [[%s]]: %s", name, message);
}