dlfcn/tstcxaatexit.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 extern void *__dso_handle __attribute__ ((__weak__));
  23
  24 int
  25 main (void)
  26 {
  27   const char fname[] = "modcxaatexit.so";
  28   void *h;
  29   void (*fp) (void *);
  30   int v = 0;
  31
  32   if (&__dso_handle == NULL)
  33     {
  34       puts ("__dso_handle not available, cannot perform the test");
  35       exit (0);
  36     }
  37
  38   h = dlopen (fname, RTLD_LAZY);
  39   if (h == NULL)
  40     {
  41       printf ("cannot open \"%s\": %s\n", fname, dlerror ());
  42       exit (1);
  43     }
  44
  45   fp = dlsym (h, "bar");
  46   if (fp == NULL)
  47     {
  48       printf ("cannot find \"bar\": %s\n", dlerror ());
  49       exit (1);
  50     }
  51
  52   fp (&v);
  53
  54   if (dlclose (h) != 0)
  55     {
  56       printf ("cannot close \"%s\": %s\n", fname, dlerror ());
  57       exit (1);
  58     }
  59
  60   if (v != 1)
  61     {
  62       puts ("module unload didn't change `v'");
  63       exit (1);
  64     }
  65
  66   puts ("finishing now");
  67
  68   return 0;
  69 }