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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 
40 extern int __cxa_atexit(void (*func)(void *), void *arg, void *dso);
41 
42 /*
43  * Register a function to be performed at exit.
44  */
45 int
atexit(void (* func)(void))46 atexit(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