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glibc  2.9
tstatexit.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 
00024 extern void *__dso_handle __attribute__ ((__weak__));
00025 
00026 int
00027 main (void)
00028 {
00029   const char fname[] = "modatexit.so";
00030   void *h;
00031   void (*fp) (void *);
00032   int v = 0;
00033 
00034   if (&__dso_handle == NULL)
00035     {
00036       puts ("__dso_handle not available, cannot perform the test");
00037       exit (0);
00038     }
00039 
00040   h = dlopen (fname, RTLD_NOW);
00041   if (h == NULL)
00042     {
00043       printf ("cannot open \"%s\": %s\n", fname, dlerror ());
00044       exit (1);
00045     }
00046 
00047   fp = dlsym (h, "foo");
00048   if (fp == NULL)
00049     {
00050       printf ("cannot find \"foo\": %s\n", dlerror ());
00051       exit (1);
00052     }
00053 
00054   fp (&v);
00055 
00056   if (dlclose (h) != 0)
00057     {
00058       printf ("cannot close \"%s\": %s\n", fname, dlerror ());
00059       exit (1);
00060     }
00061 
00062   if (v != 1)
00063     {
00064       puts ("module unload didn't change `v'");
00065       exit (1);
00066     }
00067 
00068   puts ("finishing now");
00069 
00070   return 0;
00071 }