1 /*
2 * Copyright (C) 2020 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 <stdio.h>
30 #include <stdlib.h>
31
32 #include <string>
33
34 extern "C" int __cxa_atexit(void (*func)(void*), void* arg, void* dso);
35
36 extern void* __dso_handle;
37
dtor_func(void *)38 static void dtor_func(void*) {}
39
40 // Prevent the compiler from optimizing out the __cxa_atexit call.
41 void (*volatile g_pdtor_func)(void*) = dtor_func;
42
main(int argc,char * argv[])43 int main(int argc, char* argv[]) {
44 auto usage = [&argv]() {
45 fprintf(stderr, "usage: %s COUNT MODE\n", argv[0]);
46 fprintf(stderr, "MODE is one of '_Exit' or 'exit'.\n");
47 exit(1);
48 };
49
50 if (argc != 3) usage();
51
52 int count = atoi(argv[1]);
53
54 // Two modes: "_Exit" ==> exit early w/o calling dtors, "exit" ==> call dtors on exit.
55 std::string mode = argv[2];
56 if (mode != "_Exit" && mode != "exit") usage();
57
58 for (int i = 0; i < count; ++i) {
59 __cxa_atexit(g_pdtor_func, nullptr, &__dso_handle);
60 }
61
62 if (mode == "_Exit") {
63 _Exit(0);
64 } else {
65 exit(0);
66 }
67 }
68