1 /*
2 * Copyright (C) 2008 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
18 /*
19 * System clock functions.
20 */
21
22 #ifdef HAVE_ANDROID_OS
23 #include <linux/ioctl.h>
24 #include <linux/rtc.h>
25 #include <utils/Atomic.h>
26 #include <linux/android_alarm.h>
27 #endif
28
29 #include <sys/time.h>
30 #include <limits.h>
31 #include <fcntl.h>
32 #include <errno.h>
33 #include <string.h>
34
35 #include <utils/SystemClock.h>
36 #include <utils/Timers.h>
37
38 #define LOG_TAG "SystemClock"
39 #include "utils/Log.h"
40
41 namespace android {
42
43 /*
44 * Set the current time. This only works when running as root.
45 */
setCurrentTimeMillis(int64_t millis)46 int setCurrentTimeMillis(int64_t millis)
47 {
48 #if WIN32
49 // not implemented
50 return -1;
51 #else
52 struct timeval tv;
53 #ifdef HAVE_ANDROID_OS
54 struct timespec ts;
55 int fd;
56 int res;
57 #endif
58 int ret = 0;
59
60 if (millis <= 0 || millis / 1000LL >= INT_MAX) {
61 return -1;
62 }
63
64 tv.tv_sec = (time_t) (millis / 1000LL);
65 tv.tv_usec = (suseconds_t) ((millis % 1000LL) * 1000LL);
66
67 LOGD("Setting time of day to sec=%d\n", (int) tv.tv_sec);
68
69 #ifdef HAVE_ANDROID_OS
70 fd = open("/dev/alarm", O_RDWR);
71 if(fd < 0) {
72 LOGW("Unable to open alarm driver: %s\n", strerror(errno));
73 return -1;
74 }
75 ts.tv_sec = tv.tv_sec;
76 ts.tv_nsec = tv.tv_usec * 1000;
77 res = ioctl(fd, ANDROID_ALARM_SET_RTC, &ts);
78 if(res < 0) {
79 LOGW("Unable to set rtc to %ld: %s\n", tv.tv_sec, strerror(errno));
80 ret = -1;
81 }
82 close(fd);
83 #else
84 if (settimeofday(&tv, NULL) != 0) {
85 LOGW("Unable to set clock to %d.%d: %s\n",
86 (int) tv.tv_sec, (int) tv.tv_usec, strerror(errno));
87 ret = -1;
88 }
89 #endif
90
91 return ret;
92 #endif // WIN32
93 }
94
95 /*
96 * native public static long uptimeMillis();
97 */
uptimeMillis()98 int64_t uptimeMillis()
99 {
100 int64_t when = systemTime(SYSTEM_TIME_MONOTONIC);
101 return (int64_t) nanoseconds_to_milliseconds(when);
102 }
103
104 /*
105 * native public static long elapsedRealtime();
106 */
elapsedRealtime()107 int64_t elapsedRealtime()
108 {
109 #ifdef HAVE_ANDROID_OS
110 static int s_fd = -1;
111
112 if (s_fd == -1) {
113 int fd = open("/dev/alarm", O_RDONLY);
114 if (android_atomic_cmpxchg(-1, fd, &s_fd)) {
115 close(fd);
116 }
117 }
118
119 struct timespec ts;
120 int result = ioctl(s_fd,
121 ANDROID_ALARM_GET_TIME(ANDROID_ALARM_ELAPSED_REALTIME), &ts);
122
123 if (result == 0) {
124 int64_t when = seconds_to_nanoseconds(ts.tv_sec) + ts.tv_nsec;
125 return (int64_t) nanoseconds_to_milliseconds(when);
126 } else {
127 // XXX: there was an error, probably because the driver didn't
128 // exist ... this should return
129 // a real error, like an exception!
130 int64_t when = systemTime(SYSTEM_TIME_MONOTONIC);
131 return (int64_t) nanoseconds_to_milliseconds(when);
132 }
133 #else
134 int64_t when = systemTime(SYSTEM_TIME_MONOTONIC);
135 return (int64_t) nanoseconds_to_milliseconds(when);
136 #endif
137 }
138
139 }; // namespace android
140