LXR linux/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
  43int is32bits(void)
  44{
  45        return (sizeof(long) == 4);
  46}
  47
  48int 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
  62int 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
  74int 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
 127out:
 128        /* restore clock */
 129        settime(start);
 130        if (ret)
 131                return ksft_exit_fail();
 132        return ksft_exit_pass();
 133}
 134