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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 extern void __cxa_finalize(void *);
     30 extern void *__dso_handle;
     31 
     32 __attribute__((visibility("hidden"),destructor))
     33 void __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.h"
     57 #include "atexit.h"
     58 #endif
     59