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glibc  2.9
modatexit.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 <stdio.h>
00020 #include <stdlib.h>
00021 
00022 int global;
00023 int *ip;
00024 
00025 extern void dummy (void);
00026 extern void foo (void *p);
00027 
00028 void
00029 dummy (void)
00030 {
00031   printf ("This is %s\n", __FUNCTION__);
00032   *ip = global = 1;
00033 }
00034 
00035 
00036 void
00037 foo (void *p)
00038 {
00039   extern void *__dso_handle __attribute__ ((__weak__));
00040   printf ("This is %s\n", __FUNCTION__);
00041   atexit (dummy);
00042   if (&__dso_handle) puts ("have dso handle"); else puts ("no dso handle");
00043   ip = p;
00044 }