test_executable_destructor.c revision 133a37ede3e955093c6004d94496e2cdc2cc1264 
1/*
2 * Copyright (C) 2010 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#include <stdio.h>
29#include <unistd.h>
30#include <errno.h>
31#include <string.h>
32#include <sys/wait.h>
33#include <sys/resource.h>
34
35/* A very simple program used to test constructor and destructor functions
36 * in executables (instead of shared libraries).
37 */
38
39int x = 0;
40
41/* Initialize x to 1 when the program starts. This will be checked
42 * later by the main() function.
43 */
44static void __attribute__((constructor))
45on_load(void)
46{
47    x = 1;
48}
49
50/* Crash intentionally if 'x' is set to 1 */
51static void __attribute__((destructor))
52on_exit(void)
53{
54    if (x == 1)
55        *(int*)(void*)0 = 10;  /* force a crash */
56}
57
58int main(void)
59{
60    int status;
61    pid_t pid;
62
63    /* First, check that the constructor was properly called ! */
64    if (x != 1) {
65        fprintf(stderr, "Constructor function not called!!\n");
66        return 1;
67    }
68
69    /* prevent our crashing child process from generating a core file */
70    {
71        struct rlimit rlim;
72        rlim.rlim_cur = 0;
73        rlim.rlim_max = RLIM_INFINITY;
74        setrlimit(RLIMIT_CORE, &rlim);
75    }
76
77    /* Fork the current process, then wait for the child to exit
78     * and crash.
79     */
80    pid = fork();
81    if (pid < 0) {
82        fprintf(stderr, "Could not fork process: %s\n", strerror(errno));
83        return 2;
84    }
85    /* in the child, simply exit after 1 second. */
86    if (pid == 0) {
87        sleep(1);
88        return 0;
89    }
90    /* in the parent, wait for the child to terminate */
91    if (wait(&status) < 0) {
92        fprintf(stderr, "Could not wait for child: %s\n", strerror(errno));
93        return 3;
94    }
95    if (!WIFSIGNALED(status)) {
96        fprintf(stderr, "Destructor not called!!\n");
97        return 4;
98    }
99
100    /* Prevent crashing */
101    x = 2;
102    printf("ok\n");
103    return 0;
104}
105