1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
|
/* $OpenBSD: atexit_test.c,v 1.8 2015/10/25 04:11:00 guenther Exp $ */
/*
* Copyright (c) 2002 Daniel Hartmeier
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* Effort sponsored in part by the Defense Advanced Research Projects
* Agency (DARPA) and Air Force Research Laboratory, Air Force
* Materiel Command, USAF, under agreement number F30602-01-2-0537.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <unistd.h>
#include "stdlib/atexit.h"
void handle_first(void);
void handle_middle(void);
void handle_last(void);
void handle_invalid(void *);
void handle_cleanup(void);
void handle_signal(int);
static int counter;
int
main(int argc, char *argv[])
{
int i;
if (argc != 2 || (strcmp(argv[1], "-valid") &&
strcmp(argv[1], "-invalid-atexit") &&
strcmp(argv[1], "-invalid-cleanup"))) {
fprintf(stderr, "%s -valid/-invalid-atexit/-invalid-cleanup\n",
argv[0]);
return (1);
}
fprintf(stderr, "main()\n");
if (atexit(handle_last)) {
perror("atexit(handle_last) failed");
return (1);
}
for (i = 0; i < 65535; ++i) {
if (atexit(handle_middle)) {
perror("atexit(handle_middle) failed");
return (1);
}
}
if (atexit(handle_first)) {
perror("atexit(handle_first) failed");
return (1);
}
/* this is supposed to segfault */
if (!strcmp(argv[1], "-invalid-atexit")) {
signal(SIGSEGV, handle_signal);
__atexit->fns[0].fn_ptr = handle_invalid;
} else if (!strcmp(argv[1], "-invalid-cleanup")) {
struct atexit *p = __atexit;
signal(SIGSEGV, handle_signal);
while (p != NULL && p->next != NULL)
p = p->next;
if (p == NULL)
fprintf(stderr, "p == NULL, no page found\n");
p->fns[0].fn_ptr = handle_invalid;
}
__atexit_register_cleanup(handle_cleanup);
counter = 0;
fprintf(stderr, "main() returns\n");
return (0);
}
void
handle_first(void)
{
fprintf(stderr, "handle_first() counter == %i\n", counter);
}
void
handle_middle(void)
{
counter++;
}
void
handle_last(void)
{
fprintf(stderr, "handle_last() counter == %i\n", counter);
}
void
handle_cleanup(void)
{
fprintf(stderr, "handle_cleanup()\n");
}
void
handle_invalid(void *arg)
{
fprintf(stderr, "handle_invalid() THIS SHOULD HAVE SEGFAULTED INSTEAD!\n");
}
void
handle_signal(int sigraised)
{
switch (sigraised) {
case SIGSEGV:
dprintf(STDERR_FILENO, "SIGSEGV\n");
exit(0);
default:
dprintf(STDERR_FILENO, "unexpected signal caught\n");
exit(1);
}
}
|
