1/* Time bounds setting test
2 *		by: john stultz (johnstul@us.ibm.com)
3 *		(C) Copyright IBM 2012
4 *		Licensed under the GPLv2
5 *
6 *  NOTE: This is a meta-test which sets the time to edge cases then
7 *  uses other tests to detect problems. Thus this test requires that
8 *  the inconsistency-check and nanosleep tests be present in the same
9 *  directory it is run from.
10 *
11 *  To build:
12 *	$ gcc set-2038.c -o set-2038 -lrt
13 *
14 *   This program is free software: you can redistribute it and/or modify
15 *   it under the terms of the GNU General Public License as published by
16 *   the Free Software Foundation, either version 2 of the License, or
17 *   (at your option) any later version.
18 *
19 *   This program is distributed in the hope that it will be useful,
20 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
21 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
22 *   GNU General Public License for more details.
23 */
24
25#include <stdio.h>
26#include <stdlib.h>
27#include <unistd.h>
28#include <time.h>
29#include <sys/time.h>
30#include "../kselftest.h"
31
32#define NSEC_PER_SEC 1000000000LL
33
34#define KTIME_MAX	((long long)~((unsigned long long)1 << 63))
35#define KTIME_SEC_MAX	(KTIME_MAX / NSEC_PER_SEC)
36
37#define YEAR_1901 (-0x7fffffffL)
38#define YEAR_1970 1
39#define YEAR_2038 0x7fffffffL			/*overflows 32bit time_t */
40#define YEAR_2262 KTIME_SEC_MAX			/*overflows 64bit ktime_t */
41#define YEAR_MAX  ((long long)((1ULL<<63)-1))	/*overflows 64bit time_t */
42
43int is32bits(void)
44{
45	return (sizeof(long) == 4);
46}
47
48int settime(long long time)
49{
50	struct timeval now;
51	int ret;
52
53	now.tv_sec = (time_t)time;
54	now.tv_usec  = 0;
55
56	ret = settimeofday(&now, NULL);
57
58	printf("Setting time to 0x%lx: %d\n", (long)time, ret);
59	return ret;
60}
61
62int do_tests(void)
63{
64	int ret;
65
66	ret = system("date");
67	ret = system("./inconsistency-check -c 0 -t 20");
68	ret |= system("./nanosleep");
69	ret |= system("./nsleep-lat");
70	return ret;
71
72}
73
74int main(int argc, char *argv[])
75{
76	int ret = 0;
77	int opt, dangerous = 0;
78	time_t start;
79
80	/* Process arguments */
81	while ((opt = getopt(argc, argv, "d")) != -1) {
82		switch (opt) {
83		case 'd':
84			dangerous = 1;
85		}
86	}
87
88	start = time(0);
89
90	/* First test that crazy values don't work */
91	if (!settime(YEAR_1901)) {
92		ret = -1;
93		goto out;
94	}
95	if (!settime(YEAR_MAX)) {
96		ret = -1;
97		goto out;
98	}
99	if (!is32bits() && !settime(YEAR_2262)) {
100		ret = -1;
101		goto out;
102	}
103
104	/* Now test behavior near edges */
105	settime(YEAR_1970);
106	ret = do_tests();
107	if (ret)
108		goto out;
109
110	settime(YEAR_2038 - 600);
111	ret = do_tests();
112	if (ret)
113		goto out;
114
115	/* The rest of the tests can blowup on 32bit systems */
116	if (is32bits() && !dangerous)
117		goto out;
118	/* Test rollover behavior 32bit edge */
119	settime(YEAR_2038 - 10);
120	ret = do_tests();
121	if (ret)
122		goto out;
123
124	settime(YEAR_2262 - 600);
125	ret = do_tests();
126
127out:
128	/* restore clock */
129	settime(start);
130	if (ret)
131		return ksft_exit_fail();
132	return ksft_exit_pass();
133}
134