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 <include/vdso/time64.h> 31 #include "../kselftest.h" 32 33 #define KTIME_MAX ((long long)~((unsigned long long)1 << 63)) 34 #define KTIME_SEC_MAX (KTIME_MAX / NSEC_PER_SEC) 35 36 #define YEAR_1901 (-0x7fffffffL) 37 #define YEAR_1970 1 38 #define YEAR_2038 0x7fffffffL /*overflows 32bit time_t */ 39 #define YEAR_2262 KTIME_SEC_MAX /*overflows 64bit ktime_t */ 40 #define YEAR_MAX ((long long)((1ULL<<63)-1)) /*overflows 64bit time_t */ 41 42 int is32bits(void) 43 { 44 return (sizeof(long) == 4); 45 } 46 47 int settime(long long time) 48 { 49 struct timeval now; 50 int ret; 51 52 now.tv_sec = (time_t)time; 53 now.tv_usec = 0; 54 55 ret = settimeofday(&now, NULL); 56 57 printf("Setting time to 0x%lx: %d\n", (long)time, ret); 58 return ret; 59 } 60 61 int do_tests(void) 62 { 63 int ret; 64 65 ret = system("date"); 66 ret = system("./inconsistency-check -c 0 -t 20"); 67 ret |= system("./nanosleep"); 68 ret |= system("./nsleep-lat"); 69 return ret; 70 71 } 72 73 int main(int argc, char *argv[]) 74 { 75 int ret = 0; 76 int opt, dangerous = 0; 77 time_t start; 78 79 /* Process arguments */ 80 while ((opt = getopt(argc, argv, "d")) != -1) { 81 switch (opt) { 82 case 'd': 83 dangerous = 1; 84 } 85 } 86 87 start = time(0); 88 89 /* First test that crazy values don't work */ 90 if (!settime(YEAR_1901)) { 91 ret = -1; 92 goto out; 93 } 94 if (!settime(YEAR_MAX)) { 95 ret = -1; 96 goto out; 97 } 98 if (!is32bits() && !settime(YEAR_2262)) { 99 ret = -1; 100 goto out; 101 } 102 103 /* Now test behavior near edges */ 104 settime(YEAR_1970); 105 ret = do_tests(); 106 if (ret) 107 goto out; 108 109 settime(YEAR_2038 - 600); 110 ret = do_tests(); 111 if (ret) 112 goto out; 113 114 /* The rest of the tests can blowup on 32bit systems */ 115 if (is32bits() && !dangerous) 116 goto out; 117 /* Test rollover behavior 32bit edge */ 118 settime(YEAR_2038 - 10); 119 ret = do_tests(); 120 if (ret) 121 goto out; 122 123 settime(YEAR_2262 - 600); 124 ret = do_tests(); 125 126 out: 127 /* restore clock */ 128 settime(start); 129 if (ret) 130 ksft_exit_fail(); 131 ksft_exit_pass(); 132 } 133