1  /* Copyright (C) 2000-2023 Free Software Foundation, Inc.
       2     This file is part of the GNU C Library.
       3  
       4     The GNU C Library is free software; you can redistribute it and/or
       5     modify it under the terms of the GNU Lesser General Public
       6     License as published by the Free Software Foundation; either
       7     version 2.1 of the License, or (at your option) any later version.
       8  
       9     The GNU C Library is distributed in the hope that it will be useful,
      10     but WITHOUT ANY WARRANTY; without even the implied warranty of
      11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      12     Lesser General Public License for more details.
      13  
      14     You should have received a copy of the GNU Lesser General Public
      15     License along with the GNU C Library; if not, see
      16     <https://www.gnu.org/licenses/>.  */
      17  
      18  #include <dlfcn.h>
      19  #include <stdio.h>
      20  #include <stdlib.h>
      21  #include <string.h>
      22  
      23  int
      24  main (void)
      25  {
      26    void *h;
      27    const char *s;
      28  
      29    /* Test that dlerror works initially.  */
      30    s = dlerror ();
      31    printf ("dlerror() without prior dl*() call returned: %s\n", s);
      32    if (s != NULL)
      33      return 1;
      34  
      35    h = dlopen ("errmsg1mod.so", RTLD_NOW);
      36    if (h != NULL)
      37      {
      38        dlclose (h);
      39        puts ("errmsg1mod.so could be loaded !?");
      40        exit (1);
      41      }
      42  
      43    s = dlerror ();
      44    puts (s);
      45  
      46    return strstr (s, "errmsg1mod.so") == NULL;
      47  }