crtbegin_so.c revision f3cfcd869ded41d25c1f4f4e48e7c374a64f9583 
1/*
2 * Copyright (C) 2012 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *  * Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 *  * Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in
12 *    the documentation and/or other materials provided with the
13 *    distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29extern void __cxa_finalize(void *);
30extern void *__dso_handle;
31
32__attribute__((visbility("hidden")))
33void __on_dlclose() {
34  __cxa_finalize(&__dso_handle);
35}
36
37/* CRT_LEGACY_WORKAROUND should only be defined when building
38 * this file as part of the platform's C library.
39 *
40 * The C library already defines a function named 'atexit()'
41 * for backwards compatibility with older NDK-generated binaries.
42 *
43 * For newer ones, 'atexit' is actually embedded in the C
44 * runtime objects that are linked into the final ELF
45 * binary (shared library or executable), and will call
46 * __cxa_atexit() in order to un-register any atexit()
47 * handler when a library is unloaded.
48 *
49 * This function must be global *and* hidden. Only the
50 * code inside the same ELF binary should be able to access it.
51 */
52
53#ifdef CRT_LEGACY_WORKAROUND
54#include "__dso_handle.h"
55#else
56#include "__dso_handle_so.c"
57#include "atexit.h"
58#endif
59