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1 /* $NetBSD: h_atexit.c,v 1.1 2011/01/12 19:44:08 pgoyette Exp $ */
2
3 /*-
4  * Copyright (c) 2011 The NetBSD Foundation, Inc.
5  * All rights reserved.
6  *
7  * This code was contributed to The NetBSD Foundation by Jason R. Thorpe.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  * 1. Redistributions of source code must retain the above copyright
13  *    notice, this list of conditions and the following disclaimer.
14  * 2. Redistributions in binary form must reproduce the above copyright
15  *    notice, this list of conditions and the following disclaimer in the
16  *    documentation and/or other materials provided with the distribution.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
19  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
20  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
21  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
22  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28  * POSSIBILITY OF SUCH DAMAGE.
29  */
30
31 #include <sys/cdefs.h>
32 __COPYRIGHT("@(#) Copyright (c) 2011\
33  The NetBSD Foundation, inc. All rights reserved.");
34 __RCSID("$NetBSD: h_atexit.c,v 1.1 2011/01/12 19:44:08 pgoyette Exp $");
35
36 #include <stdio.h>
37 #include <stdlib.h>
38 #include <signal.h>
39 #include <string.h>
40 #include <unistd.h>
41
42 extern int __cxa_atexit(void (*func)(void *), void *, void *);
43 extern void __cxa_finalize(void *);
44
45 #ifdef __FreeBSD__
46 /*
47  * On shared object unload, in __cxa_finalize, call and clear all installed
48  * atexit and __cxa_atexit handlers that are either installed by unloaded
49  * dso, or points to the functions provided by the dso.
50  *
51  * The reason of the change is to ensure that there is no lingering pointers
52  * to the unloaded code after the dlclose(3).  It is known reason for infinite
53  * stream of the crash reports for many programs which use loadable modules
54  * and fail to properly clean on module unload.  Examples are apache, php,
55  * perl etc.
56  *
57  * You pass the &dso_handle_1 and &dso_handle_2, which points inside the
58  * main binary, to the registration function.  The code from r211706,
59  * correctly detects that they are for the main binary, and on the first
60  * call to __cxa_finalize(), which also pass pointer to main binary, all
61  * registered functions from the main binary are executed.
62  */
63
64 static void *dso_handle_1 = (void *)1;
65 static void *dso_handle_2 = (void *)2;
66 static void *dso_handle_3 = (void *)3;
67 #else
68 static int dso_handle_1;
69 static int dso_handle_2;
70 static int dso_handle_3;
71 #endif
72
73 static int arg_1;
74 static int arg_2;
75 static int arg_3;
76
77 static int exiting_state;
78
79 #define ASSERT(expr)                                                    \
80 do {                                                                    \
81         if ((expr) == 0) {                                              \
82                 write(STDERR_FILENO, __func__, strlen(__func__));       \
83                 write(STDERR_FILENO, ": ", 2);                          \
84                 write(STDERR_FILENO, __STRING(expr),                    \
85                       strlen(__STRING(expr)));                          \
86                 write(STDERR_FILENO, "\n", 1);                          \
87                 my_abort();                                             \
88         }                                                               \
89 } while (/*CONSTCOND*/0)
90
91 #define SUCCESS()                                                       \
92 do {                                                                    \
93         write(STDOUT_FILENO, __func__, strlen(__func__));               \
94         write(STDOUT_FILENO, "\n", 1);                                  \
95 } while (/*CONSTCOND*/0)
96
97 static void
98 my_abort(void)
99 {
100
101         kill(getpid(), SIGABRT);
102         /* NOTREACHED */
103 }
104
105 static void
106 cxa_handler_5(void *arg)
107 {
108         static int cxa_handler_5_called;
109
110         ASSERT(arg == (void *)&arg_1);
111         ASSERT(cxa_handler_5_called == 0);
112         ASSERT(exiting_state == 5);
113
114         exiting_state--;
115         cxa_handler_5_called = 1;
116         SUCCESS();
117 }
118
119 static void
120 cxa_handler_4(void *arg)
121 {
122         static int cxa_handler_4_called;
123
124         ASSERT(arg == (void *)&arg_1);
125         ASSERT(cxa_handler_4_called == 0);
126         ASSERT(exiting_state == 4);
127
128         exiting_state--;
129         cxa_handler_4_called = 1;
130         SUCCESS();
131 }
132
133 static void
134 cxa_handler_3(void *arg)
135 {
136         static int cxa_handler_3_called;
137
138         ASSERT(arg == (void *)&arg_2);
139         ASSERT(cxa_handler_3_called == 0);
140         ASSERT(exiting_state == 3);
141
142         exiting_state--;
143         cxa_handler_3_called = 1;
144         SUCCESS();
145 }
146
147 static void
148 cxa_handler_2(void *arg)
149 {
150         static int cxa_handler_2_called;
151
152         ASSERT(arg == (void *)&arg_3);
153         ASSERT(cxa_handler_2_called == 0);
154         ASSERT(exiting_state == 2);
155
156         exiting_state--;
157         cxa_handler_2_called = 1;
158         SUCCESS();
159 }
160
161 static void
162 normal_handler_1(void)
163 {
164         static int normal_handler_1_called;
165
166         ASSERT(normal_handler_1_called == 0);
167         ASSERT(exiting_state == 1);
168
169         exiting_state--;
170         normal_handler_1_called = 1;
171         SUCCESS();
172 }
173
174 static void
175 normal_handler_0(void)
176 {
177         static int normal_handler_0_called;
178
179         ASSERT(normal_handler_0_called == 0);
180         ASSERT(exiting_state == 0);
181
182         normal_handler_0_called = 1;
183         SUCCESS();
184 }
185
186 int
187 main(int argc, char *argv[])
188 {
189
190         exiting_state = 5;
191
192         ASSERT(0 == atexit(normal_handler_0));
193         ASSERT(0 == atexit(normal_handler_1));
194 #ifdef __FreeBSD__
195         ASSERT(0 == __cxa_atexit(cxa_handler_4, &arg_1, dso_handle_1));
196         ASSERT(0 == __cxa_atexit(cxa_handler_5, &arg_1, dso_handle_1));
197         ASSERT(0 == __cxa_atexit(cxa_handler_3, &arg_2, dso_handle_2));
198         ASSERT(0 == __cxa_atexit(cxa_handler_2, &arg_3, dso_handle_3));
199
200         __cxa_finalize(dso_handle_1);
201         __cxa_finalize(dso_handle_2);
202 #else
203         ASSERT(0 == __cxa_atexit(cxa_handler_4, &arg_1, &dso_handle_1));
204         ASSERT(0 == __cxa_atexit(cxa_handler_5, &arg_1, &dso_handle_1));
205         ASSERT(0 == __cxa_atexit(cxa_handler_3, &arg_2, &dso_handle_2));
206         ASSERT(0 == __cxa_atexit(cxa_handler_2, &arg_3, &dso_handle_3));
207
208         __cxa_finalize(&dso_handle_1);
209         __cxa_finalize(&dso_handle_2);
210 #endif
211         exit(0);
212 }