1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
|
/*
* 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>
#include <android-base/unique_fd.h>
static int hwtime(int flag, int request, struct rtc_time *tm) {
static const char rtc[] = "/dev/rtc0";
int ret = access(rtc, flag & O_WRONLY);
if (ret < 0) {
return -errno;
}
if (flag & O_WRONLY) {
struct stat st;
ret = TEMP_FAILURE_RETRY(stat(rtc, &st));
if (ret < 0) {
return -errno;
} else if (!(st.st_mode & (S_IWUSR|S_IWGRP|S_IWOTH))) {
return -EACCES;
}
}
for (int count = 0; count < 10; count++) {
ret = TEMP_FAILURE_RETRY(open(rtc, flag));
if (ret < 0) {
if (errno == EBUSY) {
sleep(1);
continue;
}
return -errno;
}
break;
}
android::base::unique_fd fd(ret);
for (int count = 0; count < 10; count++) {
ret = TEMP_FAILURE_RETRY(ioctl(fd.get(), request, tm));
if (ret < 0) {
if (errno == EBUSY) {
sleep(1);
continue;
}
return -errno;
}
return ret;
};
return -EBUSY;
}
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);
}
|
