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/* Time bounds setting test
* by: john stultz (johnstul@us.ibm.com)
* (C) Copyright IBM 2012
* Licensed under the GPLv2
*
* NOTE: This is a meta-test which sets the time to edge cases then
* uses other tests to detect problems. Thus this test requires that
* the inconsistency-check and nanosleep tests be present in the same
* directory it is run from.
*
* To build:
* $ gcc set-2038.c -o set-2038 -lrt
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <time.h>
#include <sys/time.h>
#include "../kselftest.h"
#define NSEC_PER_SEC 1000000000LL
#define KTIME_MAX ((long long)~((unsigned long long)1 << 63))
#define KTIME_SEC_MAX (KTIME_MAX / NSEC_PER_SEC)
#define YEAR_1901 (-0x7fffffffL)
#define YEAR_1970 1
#define YEAR_2038 0x7fffffffL /*overflows 32bit time_t */
#define YEAR_2262 KTIME_SEC_MAX /*overflows 64bit ktime_t */
#define YEAR_MAX ((long long)((1ULL<<63)-1)) /*overflows 64bit time_t */
int is32bits(void)
{
return (sizeof(long) == 4);
}
int settime(long long time)
{
struct timeval now;
int ret;
now.tv_sec = (time_t)time;
now.tv_usec = 0;
ret = settimeofday(&now, NULL);
printf("Setting time to 0x%lx: %d\n", (long)time, ret);
return ret;
}
int do_tests(void)
{
int ret;
ret = system("date");
ret = system("./inconsistency-check -c 0 -t 20");
ret |= system("./nanosleep");
ret |= system("./nsleep-lat");
return ret;
}
int main(int argc, char *argv[])
{
int ret = 0;
int opt, dangerous = 0;
time_t start;
/* Process arguments */
while ((opt = getopt(argc, argv, "d")) != -1) {
switch (opt) {
case 'd':
dangerous = 1;
}
}
start = time(0);
/* First test that crazy values don't work */
if (!settime(YEAR_1901)) {
ret = -1;
goto out;
}
if (!settime(YEAR_MAX)) {
ret = -1;
goto out;
}
if (!is32bits() && !settime(YEAR_2262)) {
ret = -1;
goto out;
}
/* Now test behavior near edges */
settime(YEAR_1970);
ret = do_tests();
if (ret)
goto out;
settime(YEAR_2038 - 600);
ret = do_tests();
if (ret)
goto out;
/* The rest of the tests can blowup on 32bit systems */
if (is32bits() && !dangerous)
goto out;
/* Test rollover behavior 32bit edge */
settime(YEAR_2038 - 10);
ret = do_tests();
if (ret)
goto out;
settime(YEAR_2262 - 600);
ret = do_tests();
out:
/* restore clock */
settime(start);
if (ret)
ksft_exit_fail();
ksft_exit_pass();
}
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