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
|
/**
* util_panic_example - Example program for util_panic
*
* Copyright IBM Corp. 2016, 2017
*
* s390-tools is free software; you can redistribute it and/or modify
* it under the terms of the MIT license. See LICENSE for details.
*/
//! [code]
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/resource.h>
#include <sys/time.h>
#include "lib/zt_common.h"
#include "lib/util_panic.h"
/* Make functions noinline to have a nice backtrace */
/*
* Test util_panic()
*/
__noinline void panic_test_func(void)
{
fprintf(stderr, "Testing util_panic() now\n");
util_panic("Adieu beautiful world ...\n");
fprintf(stderr, "You should not see this\n");
}
/*
* Test util_panic() with errno handling
*/
__noinline void panic_errno_test_func(void)
{
const char *file = "i_do_not_exist";
if (fopen("i_do_not_exist", "r") == NULL) {
util_panic("Open file \"%s\" failed: %s\n",
file, strerror(errno));
}
fprintf(stderr, "You should not see this\n");
}
/*
* Test util_assert()
*/
__noinline void assert_test_func(void)
{
char *drink_actual = "beer";
fprintf(stderr, "Testing util_assert() now\n");
util_assert(strcmp(drink_actual, "water") == 0,
"We expected \"%s\" but got \"%s\"\n",
"water", drink_actual);
fprintf(stderr, "You should not see this\n");
}
/*
* Demonstrate util_panic() and util_assert()
*/
int main(int argc, char *argv[])
{
struct rlimit rlim_unlimited = {-1, -1};
struct rlimit rlim_zero = {0, 0};
if (argc != 2)
goto fail;
if (strcmp(argv[1], "util_panic") == 0) {
fprintf(stderr, "Disable core files: ulimit -c 0\n");
setrlimit(RLIMIT_CORE, &rlim_zero);
/* Do the panic */
panic_test_func();
} else if (strcmp(argv[1], "util_panic_errno") == 0) {
setrlimit(RLIMIT_CORE, &rlim_unlimited);
/* Do the panic */
panic_errno_test_func();
} else if (strcmp(argv[1], "util_assert") == 0) {
fprintf(stderr, "Enable core files: ulimit -c unlimited\n");
setrlimit(RLIMIT_CORE, &rlim_unlimited);
/* Do the assertion */
assert_test_func();
}
fail:
fprintf(stderr, "Usage: %s util_panic|util_panic_errno|util_assert\n", argv[0]);
return EXIT_FAILURE;
}
//! [code]
|
