1 /*
2 * Copyright (C) 2016 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <errno.h>
18 #include <fcntl.h>
19 #include <linux/rtc.h>
20 #include <sys/ioctl.h>
21 #include <sys/stat.h>
22 #include <sys/types.h>
23 #include <unistd.h>
24
25 #include <gtest/gtest.h>
26
27 #include <android-base/unique_fd.h>
28
hwtime(int flag,int request,struct rtc_time * tm)29 static int hwtime(int flag, int request, struct rtc_time *tm) {
30 static const char rtc[] = "/dev/rtc0";
31
32 int ret = access(rtc, flag & O_WRONLY);
33 if (ret < 0) {
34 return -errno;
35 }
36
37 if (flag & O_WRONLY) {
38 struct stat st;
39 ret = TEMP_FAILURE_RETRY(stat(rtc, &st));
40 if (ret < 0) {
41 return -errno;
42 } else if (!(st.st_mode & (S_IWUSR|S_IWGRP|S_IWOTH))) {
43 return -EACCES;
44 }
45 }
46
47 for (int count = 0; count < 10; count++) {
48 ret = TEMP_FAILURE_RETRY(open(rtc, flag));
49 if (ret < 0) {
50 if (errno == EBUSY) {
51 sleep(1);
52 continue;
53 }
54 return -errno;
55 }
56 break;
57 }
58 android::base::unique_fd fd(ret);
59
60 for (int count = 0; count < 10; count++) {
61 ret = TEMP_FAILURE_RETRY(ioctl(fd.get(), request, tm));
62 if (ret < 0) {
63 if (errno == EBUSY) {
64 sleep(1);
65 continue;
66 }
67 return -errno;
68 }
69 return ret;
70 };
71 return -EBUSY;
72 }
73
rd_hwtime(struct rtc_time * tm)74 static int rd_hwtime(struct rtc_time *tm) {
75 return hwtime(O_RDONLY, RTC_RD_TIME, tm);
76 }
77
set_hwtime(struct rtc_time * tm)78 static int set_hwtime(struct rtc_time *tm) {
79 return hwtime(O_WRONLY, RTC_SET_TIME, tm);
80 }
81
rtc_rollover(int start,int end)82 static void rtc_rollover(int start, int end) {
83 struct rtc_time roll;
84 memset(&roll, 0, sizeof(roll));
85 ASSERT_LE(0, rd_hwtime(&roll));
86 int mday[12] = { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
87 mday[1] = (roll.tm_year % 4) ? 28 : 29;
88 ASSERT_LE(0, roll.tm_sec);
89 ASSERT_GT(60, roll.tm_sec);
90 ASSERT_LE(0, roll.tm_min);
91 ASSERT_GT(60, roll.tm_min);
92 ASSERT_LE(0, roll.tm_hour);
93 ASSERT_GT(24, roll.tm_hour);
94 ASSERT_LE(0, roll.tm_mday);
95 ASSERT_GE(mday[roll.tm_mon], roll.tm_mday);
96 ASSERT_LE(0, roll.tm_mon);
97 ASSERT_GT(12, roll.tm_mon);
98 ASSERT_LE(0, roll.tm_year);
99 ASSERT_GT(138, roll.tm_year);
100
101 // Wait for granular clock
102 struct rtc_time save = roll;
103 static const useconds_t timeout_sleep = 10000;
104 static const int timeout_num = 2000000 / timeout_sleep;
105 int timeout;
106 for (timeout = timeout_num; timeout && (roll.tm_year == save.tm_year); --timeout) {
107 ASSERT_LE(0, rd_hwtime(&save));
108 usleep(timeout_sleep);
109 }
110
111 memset(&roll, 0, sizeof(roll));
112 roll.tm_sec = 59;
113 roll.tm_min = 59;
114 roll.tm_hour = 23;
115 roll.tm_mday = 31;
116 roll.tm_mon = 11;
117 roll.tm_year = 70;
118 roll.tm_wday = 0;
119 roll.tm_yday = 0;
120 roll.tm_isdst = 0;
121
122 bool eacces = true;
123 for (roll.tm_year = start; roll.tm_year < end; ++roll.tm_year) {
124 struct rtc_time tm = roll;
125 int __set_hwtime = set_hwtime(&tm);
126 // Allowed to be 100% denied for writing
127 if ((__set_hwtime == -EACCES) && (eacces == true)) {
128 continue;
129 }
130 eacces = false;
131 // below 2016, permitted to error out.
132 if ((__set_hwtime == -EINVAL) && (roll.tm_year < 116)) {
133 continue;
134 }
135 ASSERT_LE(0, __set_hwtime);
136 ASSERT_LE(0, rd_hwtime(&tm));
137 ASSERT_EQ(roll.tm_sec, tm.tm_sec);
138 ASSERT_EQ(roll.tm_min, tm.tm_min);
139 ASSERT_EQ(roll.tm_hour, tm.tm_hour);
140 ASSERT_EQ(roll.tm_mday, tm.tm_mday);
141 ASSERT_EQ(roll.tm_mon, tm.tm_mon);
142 ASSERT_EQ(roll.tm_year, tm.tm_year);
143 for (timeout = timeout_num; timeout && (roll.tm_year == tm.tm_year); --timeout) {
144 ASSERT_LE(0, rd_hwtime(&tm));
145 usleep(timeout_sleep);
146 }
147 ASSERT_EQ(roll.tm_year + 1, tm.tm_year);
148 EXPECT_LT(timeout_num * 5 / 100, timeout);
149 EXPECT_GT(timeout_num * 95 / 100, timeout);
150
151 // correct saved time to compensate for rollover check
152 if (++save.tm_sec >= 60) {
153 save.tm_sec = 0;
154 if (++save.tm_min >= 60) {
155 save.tm_min = 0;
156 if (++save.tm_hour >= 24) {
157 save.tm_hour = 0;
158 mday[1] = (save.tm_year % 4) ? 28 : 29;
159 if (++save.tm_mday >= mday[save.tm_mon]) {
160 save.tm_mday = 1;
161 if (++save.tm_mon >= 12) {
162 save.tm_mon = 0;
163 ++save.tm_year;
164 }
165 }
166 }
167 }
168 }
169 }
170
171 if (!eacces) {
172 ASSERT_LE(0, set_hwtime(&save));
173 }
174 ASSERT_LE(0, rd_hwtime(&roll));
175
176 if (!eacces) {
177 ASSERT_EQ(save.tm_sec, roll.tm_sec);
178 ASSERT_EQ(save.tm_min, roll.tm_min);
179 ASSERT_EQ(save.tm_hour, roll.tm_hour);
180 ASSERT_EQ(save.tm_mday, roll.tm_mday);
181 ASSERT_EQ(save.tm_mon, roll.tm_mon);
182 ASSERT_EQ(save.tm_year, roll.tm_year);
183 }
184 }
185
TEST(time,rtc_rollover_1970_1990)186 TEST(time, rtc_rollover_1970_1990) {
187 rtc_rollover(70, 90);
188 }
189
TEST(time,rtc_rollover_1990_2010)190 TEST(time, rtc_rollover_1990_2010) {
191 rtc_rollover(90, 110);
192 }
193
TEST(time,rtc_rollover_2010_2030)194 TEST(time, rtc_rollover_2010_2030) {
195 rtc_rollover(110, 130);
196 }
197
TEST(time,rtc_rollover_2030_2037)198 TEST(time, rtc_rollover_2030_2037) {
199 rtc_rollover(130, 137);
200 }
201