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 43 int is32bits(void) 44 { 45 return (sizeof(long) == 4); 46 } 47 48 int 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 62 int 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 74 int 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(); 126 127 out: 128 /* restore clock */ 129 settime(start); 130 if (ret) 131 ksft_exit_fail(); 132 ksft_exit_pass(); 133 } 134