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/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <errno.h>
#include <fcntl.h>
#include <linux/rtc.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <unistd.h>
#include <gtest/gtest.h>
static int hwtime(int flag, int request, struct rtc_time *tm) {
int ret;
do {
ret = TEMP_FAILURE_RETRY(open("/dev/rtc0", flag));
if (ret < 0) {
ret = -errno;
}
} while (ret == -EBUSY);
if (ret < 0) {
return ret;
}
int fd = ret;
do {
ret = TEMP_FAILURE_RETRY(ioctl(fd, request, tm));
if (ret < 0) {
ret = -errno;
}
} while (ret == -EBUSY);
close(fd);
return ret;
}
static int rd_hwtime(struct rtc_time *tm) {
return hwtime(O_RDONLY, RTC_RD_TIME, tm);
}
static int set_hwtime(struct rtc_time *tm) {
return hwtime(O_WRONLY, RTC_SET_TIME, tm);
}
TEST(time, rtc_rollover) {
struct rtc_time roll;
memset(&roll, 0, sizeof(roll));
ASSERT_LE(0, rd_hwtime(&roll));
int mday[12] = { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
mday[1] = (roll.tm_year % 4) ? 28 : 29;
ASSERT_LE(0, roll.tm_sec);
ASSERT_GT(60, roll.tm_sec);
ASSERT_LE(0, roll.tm_min);
ASSERT_GT(60, roll.tm_min);
ASSERT_LE(0, roll.tm_hour);
ASSERT_GT(24, roll.tm_hour);
ASSERT_LE(0, roll.tm_mday);
ASSERT_GE(mday[roll.tm_mon], roll.tm_mday);
ASSERT_LE(0, roll.tm_mon);
ASSERT_GT(12, roll.tm_mon);
ASSERT_LE(0, roll.tm_year);
ASSERT_GT(138, roll.tm_year);
// Wait for granular clock
struct rtc_time save = roll;
static const useconds_t timeout_sleep = 10000;
static const int timeout_num = 2000000 / timeout_sleep;
int timeout;
for (timeout = timeout_num; timeout && (roll.tm_year == save.tm_year); --timeout) {
ASSERT_LE(0, rd_hwtime(&save));
usleep(timeout_sleep);
}
memset(&roll, 0, sizeof(roll));
roll.tm_sec = 59;
roll.tm_min = 59;
roll.tm_hour = 23;
roll.tm_mday = 31;
roll.tm_mon = 11;
roll.tm_year = 70;
roll.tm_wday = 0;
roll.tm_yday = 0;
roll.tm_isdst = 0;
for (roll.tm_year = 70; roll.tm_year < 137; ++roll.tm_year) {
struct rtc_time tm = roll;
int __set_hwtime = set_hwtime(&tm);
// below 2015, permitted to error out.
if ((__set_hwtime == -EINVAL) && (roll.tm_year < 115)) {
continue;
}
ASSERT_LE(0, __set_hwtime);
ASSERT_LE(0, rd_hwtime(&tm));
ASSERT_EQ(roll.tm_sec, tm.tm_sec);
ASSERT_EQ(roll.tm_min, tm.tm_min);
ASSERT_EQ(roll.tm_hour, tm.tm_hour);
ASSERT_EQ(roll.tm_mday, tm.tm_mday);
ASSERT_EQ(roll.tm_mon, tm.tm_mon);
ASSERT_EQ(roll.tm_year, tm.tm_year);
for (timeout = timeout_num; timeout && (roll.tm_year == tm.tm_year); --timeout) {
ASSERT_LE(0, rd_hwtime(&tm));
usleep(timeout_sleep);
}
ASSERT_EQ(roll.tm_year + 1, tm.tm_year);
EXPECT_LT(timeout_num * 5 / 100, timeout);
EXPECT_GT(timeout_num * 95 / 100, timeout);
// correct saved time to compensate for rollover check
if (++save.tm_sec >= 60) {
save.tm_sec = 0;
if (++save.tm_min >= 60) {
save.tm_min = 0;
if (++save.tm_hour >= 24) {
save.tm_hour = 0;
mday[1] = (save.tm_year % 4) ? 28 : 29;
if (++save.tm_mday >= mday[save.tm_mon]) {
save.tm_mday = 1;
if (++save.tm_mon >= 12) {
save.tm_mon = 0;
++save.tm_year;
}
}
}
}
}
}
ASSERT_LE(0, set_hwtime(&save));
ASSERT_LE(0, rd_hwtime(&roll));
ASSERT_EQ(save.tm_sec, roll.tm_sec);
ASSERT_EQ(save.tm_min, roll.tm_min);
ASSERT_EQ(save.tm_hour, roll.tm_hour);
ASSERT_EQ(save.tm_mday, roll.tm_mday);
ASSERT_EQ(save.tm_mon, roll.tm_mon);
ASSERT_EQ(save.tm_year, roll.tm_year);
}
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