dlfcn/tstatexit.c

   1 /* Copyright (C) 2001 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 Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    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    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 #include <dlfcn.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22
  23
  24 extern void *__dso_handle __attribute__ ((__weak__));
  25
  26 int
  27 main (void)
  28 {
  29   const char fname[] = "modatexit.so";
  30   void *h;
  31   void (*fp) (void *);
  32   int v = 0;
  33
  34   if (&__dso_handle == NULL)
  35     {
  36       puts ("__dso_handle not available, cannot perform the test");
  37       exit (0);
  38     }
  39
  40   h = dlopen (fname, RTLD_NOW);
  41   if (h == NULL)
  42     {
  43       printf ("cannot open \"%s\": %s\n", fname, dlerror ());
  44       exit (1);
  45     }
  46
  47   fp = dlsym (h, "foo");
  48   if (fp == NULL)
  49     {
  50       printf ("cannot find \"foo\": %s\n", dlerror ());
  51       exit (1);
  52     }
  53
  54   fp (&v);
  55
  56   if (dlclose (h) != 0)
  57     {
  58       printf ("cannot close \"%s\": %s\n", fname, dlerror ());
  59       exit (1);
  60     }
  61
  62   if (v != 1)
  63     {
  64       puts ("module unload didn't change `v'");
  65       exit (1);
  66     }
  67
  68   puts ("finishing now");
  69
  70   return 0;
  71 }