dlfcn/tstatexit.c

   1 /* Copyright (C) 2001-2017 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    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <dlfcn.h>
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21
  22
  23 extern void *__dso_handle __attribute__ ((__weak__));
  24
  25 int
  26 main (void)
  27 {
  28   const char fname[] = "modatexit.so";
  29   void *h;
  30   void (*fp) (void *);
  31   int v = 0;
  32
  33   if (&__dso_handle == NULL)
  34     {
  35       puts ("__dso_handle not available, cannot perform the test");
  36       exit (0);
  37     }
  38
  39   h = dlopen (fname, RTLD_NOW);
  40   if (h == NULL)
  41     {
  42       printf ("cannot open \"%s\": %s\n", fname, dlerror ());
  43       exit (1);
  44     }
  45
  46   fp = dlsym (h, "foo");
  47   if (fp == NULL)
  48     {
  49       printf ("cannot find \"foo\": %s\n", dlerror ());
  50       exit (1);
  51     }
  52
  53   fp (&v);
  54
  55   if (dlclose (h) != 0)
  56     {
  57       printf ("cannot close \"%s\": %s\n", fname, dlerror ());
  58       exit (1);
  59     }
  60
  61   if (v != 1)
  62     {
  63       puts ("module unload didn't change `v'");
  64       exit (1);
  65     }
  66
  67   puts ("finishing now");
  68
  69   return 0;
  70 }