tools/testing/selftests/timers/set-2038.c

   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 }