| /* |
| * 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/stat.h> |
| #include <sys/types.h> |
| #include <unistd.h> |
| |
| #include <gtest/gtest.h> |
| |
| static int hwtime(int flag, int request, struct rtc_time *tm) { |
| static const char rtc[] = "/dev/rtc0"; |
| |
| int ret = TEMP_FAILURE_RETRY(access(rtc, flag & O_WRONLY) ? W_OK : R_OK); |
| if (ret < 0) { |
| ret = -errno; |
| } |
| if (ret == -EACCES) { |
| return ret; |
| } |
| |
| if (flag & O_WRONLY) { |
| struct stat st; |
| ret = TEMP_FAILURE_RETRY(stat(rtc, &st)); |
| if (ret < 0) { |
| ret = -errno; |
| } else if (!(st.st_mode & (S_IWUSR|S_IWGRP|S_IWOTH))) { |
| ret = -EACCES; |
| } |
| } |
| if (ret == -EACCES) { |
| return ret; |
| } |
| |
| do { |
| ret = TEMP_FAILURE_RETRY(open(rtc, 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); |
| } |
| |
| static void rtc_rollover(int start, int end) { |
| 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; |
| |
| bool eacces = true; |
| for (roll.tm_year = start; roll.tm_year < end; ++roll.tm_year) { |
| struct rtc_time tm = roll; |
| int __set_hwtime = set_hwtime(&tm); |
| // Allowed to be 100% denied for writing |
| if ((__set_hwtime == -EACCES) && (eacces == true)) { |
| continue; |
| } |
| eacces = false; |
| // below 2016, permitted to error out. |
| if ((__set_hwtime == -EINVAL) && (roll.tm_year < 116)) { |
| 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; |
| } |
| } |
| } |
| } |
| } |
| } |
| |
| if (!eacces) { |
| ASSERT_LE(0, set_hwtime(&save)); |
| } |
| ASSERT_LE(0, rd_hwtime(&roll)); |
| |
| if (!eacces) { |
| 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); |
| } |
| } |
| |
| TEST(time, rtc_rollover_1970_1990) { |
| rtc_rollover(70, 90); |
| } |
| |
| TEST(time, rtc_rollover_1990_2010) { |
| rtc_rollover(90, 110); |
| } |
| |
| TEST(time, rtc_rollover_2010_2030) { |
| rtc_rollover(110, 130); |
| } |
| |
| TEST(time, rtc_rollover_2030_2037) { |
| rtc_rollover(130, 137); |
| } |