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 #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                 return ksft_exit_fail();
 132         return ksft_exit_pass();
 133 }