glibc/dlfcn/modatexit.c

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/* Copyright (C) 2001-2013 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <stdio.h>
#include <stdlib.h>
int global;
int *ip;
extern void dummy (void);
extern void foo (void *p);
void
dummy (void)
{
printf ("This is %s\n", __FUNCTION__);
*ip = global = 1;
}
void
foo (void *p)
{
extern void *__dso_handle __attribute__ ((__weak__));
printf ("This is %s\n", __FUNCTION__);
atexit (dummy);
if (&__dso_handle) puts ("have dso handle"); else puts ("no dso handle");
ip = p;
}