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
29#include <sys/types.h>
30#include <stdio.h>
31
32#include <async_safe/log.h>
33
34/*
35 * This source file should only be included by libc.so, its purpose is
36 * to support legacy ARM binaries by exporting a publicly visible
37 * implementation of atexit().
38 */
39
40extern int __cxa_atexit(void (*func)(void *), void *arg, void *dso);
41
42/*
43 * Register a function to be performed at exit.
44 */
45int
46atexit(void (*func)(void))
47{
48    /*
49     * Exit functions queued by this version of atexit will not be called
50     * on dlclose(), and when they are called (at program exit), the
51     * calling library may have been dlclose()'d, causing the program to
52     * crash.
53     */
54    static char const warning[] = "WARNING: generic atexit() called from legacy shared library\n";
55
56    async_safe_format_log(ANDROID_LOG_WARN, "libc", warning);
57    fprintf(stderr, warning);
58
59    return (__cxa_atexit((void (*)(void *))func, NULL, NULL));
60}
61