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 33 static inline int ksft_exit_pass(void) 34 { 35 exit(0); 36 } 37 static 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 54 int is32bits(void) 55 { 56 return (sizeof(long) == 4); 57 } 58 59 int 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 73 int 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 85 int 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(); 137 138 out: 139 /* restore clock */ 140 settime(start); 141 if (ret) 142 return ksft_exit_fail(); 143 return ksft_exit_pass(); 144 } 145