1  /* Copyright (C) 2001-2023 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  
      22  int
      23  main (void)
      24  {
      25    const char fname[] = "modcxaatexit.so";
      26    void *h;
      27    void (*fp) (void *);
      28    int v = 0;
      29  
      30    h = dlopen (fname, RTLD_LAZY);
      31    if (h == NULL)
      32      {
      33        printf ("cannot open \"%s\": %s\n", fname, dlerror ());
      34        exit (1);
      35      }
      36  
      37    fp = dlsym (h, "bar");
      38    if (fp == NULL)
      39      {
      40        printf ("cannot find \"bar\": %s\n", dlerror ());
      41        exit (1);
      42      }
      43  
      44    fp (&v);
      45  
      46    if (dlclose (h) != 0)
      47      {
      48        printf ("cannot close \"%s\": %s\n", fname, dlerror ());
      49        exit (1);
      50      }
      51  
      52    if (v != 1)
      53      {
      54        puts ("module unload didn't change `v'");
      55        exit (1);
      56      }
      57  
      58    puts ("finishing now");
      59  
      60    return 0;
      61  }