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 <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 }