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
 42int is32bits(void)
 43{
 44	return (sizeof(long) == 4);
 45}
 46
 47int 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
 61int 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
 73int 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
126out:
127	/* restore clock */
128	settime(start);
129	if (ret)
130		ksft_exit_fail();
131	ksft_exit_pass();
132}