1*4882a593Smuzhiyun /* Time bounds setting test
2*4882a593Smuzhiyun * by: john stultz (johnstul@us.ibm.com)
3*4882a593Smuzhiyun * (C) Copyright IBM 2012
4*4882a593Smuzhiyun * Licensed under the GPLv2
5*4882a593Smuzhiyun *
6*4882a593Smuzhiyun * NOTE: This is a meta-test which sets the time to edge cases then
7*4882a593Smuzhiyun * uses other tests to detect problems. Thus this test requires that
8*4882a593Smuzhiyun * the inconsistency-check and nanosleep tests be present in the same
9*4882a593Smuzhiyun * directory it is run from.
10*4882a593Smuzhiyun *
11*4882a593Smuzhiyun * To build:
12*4882a593Smuzhiyun * $ gcc set-2038.c -o set-2038 -lrt
13*4882a593Smuzhiyun *
14*4882a593Smuzhiyun * This program is free software: you can redistribute it and/or modify
15*4882a593Smuzhiyun * it under the terms of the GNU General Public License as published by
16*4882a593Smuzhiyun * the Free Software Foundation, either version 2 of the License, or
17*4882a593Smuzhiyun * (at your option) any later version.
18*4882a593Smuzhiyun *
19*4882a593Smuzhiyun * This program is distributed in the hope that it will be useful,
20*4882a593Smuzhiyun * but WITHOUT ANY WARRANTY; without even the implied warranty of
21*4882a593Smuzhiyun * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22*4882a593Smuzhiyun * GNU General Public License for more details.
23*4882a593Smuzhiyun */
24*4882a593Smuzhiyun
25*4882a593Smuzhiyun #include <stdio.h>
26*4882a593Smuzhiyun #include <stdlib.h>
27*4882a593Smuzhiyun #include <unistd.h>
28*4882a593Smuzhiyun #include <time.h>
29*4882a593Smuzhiyun #include <sys/time.h>
30*4882a593Smuzhiyun #include "../kselftest.h"
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun #define NSEC_PER_SEC 1000000000LL
33*4882a593Smuzhiyun
34*4882a593Smuzhiyun #define KTIME_MAX ((long long)~((unsigned long long)1 << 63))
35*4882a593Smuzhiyun #define KTIME_SEC_MAX (KTIME_MAX / NSEC_PER_SEC)
36*4882a593Smuzhiyun
37*4882a593Smuzhiyun #define YEAR_1901 (-0x7fffffffL)
38*4882a593Smuzhiyun #define YEAR_1970 1
39*4882a593Smuzhiyun #define YEAR_2038 0x7fffffffL /*overflows 32bit time_t */
40*4882a593Smuzhiyun #define YEAR_2262 KTIME_SEC_MAX /*overflows 64bit ktime_t */
41*4882a593Smuzhiyun #define YEAR_MAX ((long long)((1ULL<<63)-1)) /*overflows 64bit time_t */
42*4882a593Smuzhiyun
is32bits(void)43*4882a593Smuzhiyun int is32bits(void)
44*4882a593Smuzhiyun {
45*4882a593Smuzhiyun return (sizeof(long) == 4);
46*4882a593Smuzhiyun }
47*4882a593Smuzhiyun
settime(long long time)48*4882a593Smuzhiyun int settime(long long time)
49*4882a593Smuzhiyun {
50*4882a593Smuzhiyun struct timeval now;
51*4882a593Smuzhiyun int ret;
52*4882a593Smuzhiyun
53*4882a593Smuzhiyun now.tv_sec = (time_t)time;
54*4882a593Smuzhiyun now.tv_usec = 0;
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun ret = settimeofday(&now, NULL);
57*4882a593Smuzhiyun
58*4882a593Smuzhiyun printf("Setting time to 0x%lx: %d\n", (long)time, ret);
59*4882a593Smuzhiyun return ret;
60*4882a593Smuzhiyun }
61*4882a593Smuzhiyun
do_tests(void)62*4882a593Smuzhiyun int do_tests(void)
63*4882a593Smuzhiyun {
64*4882a593Smuzhiyun int ret;
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun ret = system("date");
67*4882a593Smuzhiyun ret = system("./inconsistency-check -c 0 -t 20");
68*4882a593Smuzhiyun ret |= system("./nanosleep");
69*4882a593Smuzhiyun ret |= system("./nsleep-lat");
70*4882a593Smuzhiyun return ret;
71*4882a593Smuzhiyun
72*4882a593Smuzhiyun }
73*4882a593Smuzhiyun
main(int argc,char * argv[])74*4882a593Smuzhiyun int main(int argc, char *argv[])
75*4882a593Smuzhiyun {
76*4882a593Smuzhiyun int ret = 0;
77*4882a593Smuzhiyun int opt, dangerous = 0;
78*4882a593Smuzhiyun time_t start;
79*4882a593Smuzhiyun
80*4882a593Smuzhiyun /* Process arguments */
81*4882a593Smuzhiyun while ((opt = getopt(argc, argv, "d")) != -1) {
82*4882a593Smuzhiyun switch (opt) {
83*4882a593Smuzhiyun case 'd':
84*4882a593Smuzhiyun dangerous = 1;
85*4882a593Smuzhiyun }
86*4882a593Smuzhiyun }
87*4882a593Smuzhiyun
88*4882a593Smuzhiyun start = time(0);
89*4882a593Smuzhiyun
90*4882a593Smuzhiyun /* First test that crazy values don't work */
91*4882a593Smuzhiyun if (!settime(YEAR_1901)) {
92*4882a593Smuzhiyun ret = -1;
93*4882a593Smuzhiyun goto out;
94*4882a593Smuzhiyun }
95*4882a593Smuzhiyun if (!settime(YEAR_MAX)) {
96*4882a593Smuzhiyun ret = -1;
97*4882a593Smuzhiyun goto out;
98*4882a593Smuzhiyun }
99*4882a593Smuzhiyun if (!is32bits() && !settime(YEAR_2262)) {
100*4882a593Smuzhiyun ret = -1;
101*4882a593Smuzhiyun goto out;
102*4882a593Smuzhiyun }
103*4882a593Smuzhiyun
104*4882a593Smuzhiyun /* Now test behavior near edges */
105*4882a593Smuzhiyun settime(YEAR_1970);
106*4882a593Smuzhiyun ret = do_tests();
107*4882a593Smuzhiyun if (ret)
108*4882a593Smuzhiyun goto out;
109*4882a593Smuzhiyun
110*4882a593Smuzhiyun settime(YEAR_2038 - 600);
111*4882a593Smuzhiyun ret = do_tests();
112*4882a593Smuzhiyun if (ret)
113*4882a593Smuzhiyun goto out;
114*4882a593Smuzhiyun
115*4882a593Smuzhiyun /* The rest of the tests can blowup on 32bit systems */
116*4882a593Smuzhiyun if (is32bits() && !dangerous)
117*4882a593Smuzhiyun goto out;
118*4882a593Smuzhiyun /* Test rollover behavior 32bit edge */
119*4882a593Smuzhiyun settime(YEAR_2038 - 10);
120*4882a593Smuzhiyun ret = do_tests();
121*4882a593Smuzhiyun if (ret)
122*4882a593Smuzhiyun goto out;
123*4882a593Smuzhiyun
124*4882a593Smuzhiyun settime(YEAR_2262 - 600);
125*4882a593Smuzhiyun ret = do_tests();
126*4882a593Smuzhiyun
127*4882a593Smuzhiyun out:
128*4882a593Smuzhiyun /* restore clock */
129*4882a593Smuzhiyun settime(start);
130*4882a593Smuzhiyun if (ret)
131*4882a593Smuzhiyun return ksft_exit_fail();
132*4882a593Smuzhiyun return ksft_exit_pass();
133*4882a593Smuzhiyun }
134