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#ifdef KTEST
31#include "../kselftest.h"
32#else
33static inline int ksft_exit_pass(void)
34{
35	exit(0);
36}
37static inline int ksft_exit_fail(void)
38{
39	exit(1);
40}
41#endif
42
43#define NSEC_PER_SEC 1000000000LL
44
45#define KTIME_MAX	((long long)~((unsigned long long)1 << 63))
46#define KTIME_SEC_MAX	(KTIME_MAX / NSEC_PER_SEC)
47
48#define YEAR_1901 (-0x7fffffffL)
49#define YEAR_1970 1
50#define YEAR_2038 0x7fffffffL			/*overflows 32bit time_t */
51#define YEAR_2262 KTIME_SEC_MAX			/*overflows 64bit ktime_t */
52#define YEAR_MAX  ((long long)((1ULL<<63)-1))	/*overflows 64bit time_t */
53
54int is32bits(void)
55{
56	return (sizeof(long) == 4);
57}
58
59int settime(long long time)
60{
61	struct timeval now;
62	int ret;
63
64	now.tv_sec = (time_t)time;
65	now.tv_usec  = 0;
66
67	ret = settimeofday(&now, NULL);
68
69	printf("Setting time to 0x%lx: %d\n", (long)time, ret);
70	return ret;
71}
72
73int do_tests(void)
74{
75	int ret;
76
77	ret = system("date");
78	ret = system("./inconsistency-check -c 0 -t 20");
79	ret |= system("./nanosleep");
80	ret |= system("./nsleep-lat");
81	return ret;
82
83}
84
85int main(int argc, char *argv[])
86{
87	int ret = 0;
88	int opt, dangerous = 0;
89	time_t start;
90
91	/* Process arguments */
92	while ((opt = getopt(argc, argv, "d")) != -1) {
93		switch (opt) {
94		case 'd':
95			dangerous = 1;
96		}
97	}
98
99	start = time(0);
100
101	/* First test that crazy values don't work */
102	if (!settime(YEAR_1901)) {
103		ret = -1;
104		goto out;
105	}
106	if (!settime(YEAR_MAX)) {
107		ret = -1;
108		goto out;
109	}
110	if (!is32bits() && !settime(YEAR_2262)) {
111		ret = -1;
112		goto out;
113	}
114
115	/* Now test behavior near edges */
116	settime(YEAR_1970);
117	ret = do_tests();
118	if (ret)
119		goto out;
120
121	settime(YEAR_2038 - 600);
122	ret = do_tests();
123	if (ret)
124		goto out;
125
126	/* The rest of the tests can blowup on 32bit systems */
127	if (is32bits() && !dangerous)
128		goto out;
129	/* Test rollover behavior 32bit edge */
130	settime(YEAR_2038 - 10);
131	ret = do_tests();
132	if (ret)
133		goto out;
134
135	settime(YEAR_2262 - 600);
136	ret = do_tests();
137
138out:
139	/* restore clock */
140	settime(start);
141	if (ret)
142		return ksft_exit_fail();
143	return ksft_exit_pass();
144}
145