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glibc  2.9
tstcxaatexit.c
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00001 /* Copyright (C) 2001 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <dlfcn.h>
00020 #include <stdio.h>
00021 #include <stdlib.h>
00022 
00023 extern void *__dso_handle __attribute__ ((__weak__));
00024 
00025 int
00026 main (void)
00027 {
00028   const char fname[] = "modcxaatexit.so";
00029   void *h;
00030   void (*fp) (void *);
00031   int v = 0;
00032 
00033   if (&__dso_handle == NULL)
00034     {
00035       puts ("__dso_handle not available, cannot perform the test");
00036       exit (0);
00037     }
00038 
00039   h = dlopen (fname, RTLD_LAZY);
00040   if (h == NULL)
00041     {
00042       printf ("cannot open \"%s\": %s\n", fname, dlerror ());
00043       exit (1);
00044     }
00045 
00046   fp = dlsym (h, "bar");
00047   if (fp == NULL)
00048     {
00049       printf ("cannot find \"bar\": %s\n", dlerror ());
00050       exit (1);
00051     }
00052 
00053   fp (&v);
00054 
00055   if (dlclose (h) != 0)
00056     {
00057       printf ("cannot close \"%s\": %s\n", fname, dlerror ());
00058       exit (1);
00059     }
00060 
00061   if (v != 1)
00062     {
00063       puts ("module unload didn't change `v'");
00064       exit (1);
00065     }
00066 
00067   puts ("finishing now");
00068 
00069   return 0;
00070 }