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}