dlfcn/errmsg1.c

   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 }