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 "JNIHelp.h"
36 #include "jni.h"
37 #include "android_runtime/AndroidRuntime.h"
38
39 #include <sys/time.h>
40 #include <time.h>
41
42 #include <utils/SystemClock.h>
43
44 namespace android {
45
46 /*
47 * Set the current time. This only works when running as root.
48 */
setCurrentTimeMillis(int64_t millis)49 static int setCurrentTimeMillis(int64_t millis)
50 {
51 struct timeval tv;
52 struct timespec ts;
53 int fd;
54 int res;
55 int ret = 0;
56
57 if (millis <= 0 || millis / 1000LL >= INT_MAX) {
58 return -1;
59 }
60
61 tv.tv_sec = (time_t) (millis / 1000LL);
62 tv.tv_usec = (suseconds_t) ((millis % 1000LL) * 1000LL);
63
64 ALOGD("Setting time of day to sec=%d\n", (int) tv.tv_sec);
65
66 fd = open("/dev/alarm", O_RDWR);
67 if(fd < 0) {
68 ALOGW("Unable to open alarm driver: %s\n", strerror(errno));
69 return -1;
70 }
71 ts.tv_sec = tv.tv_sec;
72 ts.tv_nsec = tv.tv_usec * 1000;
73 res = ioctl(fd, ANDROID_ALARM_SET_RTC, &ts);
74 if(res < 0) {
75 ALOGW("Unable to set rtc to %ld: %s\n", tv.tv_sec, strerror(errno));
76 ret = -1;
77 }
78 close(fd);
79 return ret;
80 }
81
82 /*
83 * native public static void setCurrentTimeMillis(long millis)
84 *
85 * Set the current time. This only works when running as root.
86 */
android_os_SystemClock_setCurrentTimeMillis(JNIEnv * env,jobject clazz,jlong millis)87 static jboolean android_os_SystemClock_setCurrentTimeMillis(JNIEnv* env,
88 jobject clazz, jlong millis)
89 {
90 return (setCurrentTimeMillis(millis) == 0);
91 }
92
93 /*
94 * native public static long uptimeMillis();
95 */
android_os_SystemClock_uptimeMillis(JNIEnv * env,jobject clazz)96 static jlong android_os_SystemClock_uptimeMillis(JNIEnv* env,
97 jobject clazz)
98 {
99 return (jlong)uptimeMillis();
100 }
101
102 /*
103 * native public static long elapsedRealtime();
104 */
android_os_SystemClock_elapsedRealtime(JNIEnv * env,jobject clazz)105 static jlong android_os_SystemClock_elapsedRealtime(JNIEnv* env,
106 jobject clazz)
107 {
108 return (jlong)elapsedRealtime();
109 }
110
111 /*
112 * native public static long currentThreadTimeMillis();
113 */
android_os_SystemClock_currentThreadTimeMillis(JNIEnv * env,jobject clazz)114 static jlong android_os_SystemClock_currentThreadTimeMillis(JNIEnv* env,
115 jobject clazz)
116 {
117 #if defined(HAVE_POSIX_CLOCKS)
118 struct timespec tm;
119
120 clock_gettime(CLOCK_THREAD_CPUTIME_ID, &tm);
121
122 return tm.tv_sec * 1000LL + tm.tv_nsec / 1000000;
123 #else
124 struct timeval tv;
125
126 gettimeofday(&tv, NULL);
127 return tv.tv_sec * 1000LL + tv.tv_usec / 1000;
128 #endif
129 }
130
131 /*
132 * native public static long currentThreadTimeMicro();
133 */
android_os_SystemClock_currentThreadTimeMicro(JNIEnv * env,jobject clazz)134 static jlong android_os_SystemClock_currentThreadTimeMicro(JNIEnv* env,
135 jobject clazz)
136 {
137 #if defined(HAVE_POSIX_CLOCKS)
138 struct timespec tm;
139
140 clock_gettime(CLOCK_THREAD_CPUTIME_ID, &tm);
141
142 return tm.tv_sec * 1000000LL + tm.tv_nsec / 1000;
143 #else
144 struct timeval tv;
145
146 gettimeofday(&tv, NULL);
147 return tv.tv_sec * 1000000LL + tv.tv_nsec / 1000;
148 #endif
149 }
150
151 /*
152 * native public static long currentTimeMicro();
153 */
android_os_SystemClock_currentTimeMicro(JNIEnv * env,jobject clazz)154 static jlong android_os_SystemClock_currentTimeMicro(JNIEnv* env,
155 jobject clazz)
156 {
157 struct timeval tv;
158
159 gettimeofday(&tv, NULL);
160 return tv.tv_sec * 1000000LL + tv.tv_usec;
161 }
162
163 /*
164 * public static native long elapsedRealtimeNano();
165 */
android_os_SystemClock_elapsedRealtimeNano(JNIEnv * env,jobject clazz)166 static jlong android_os_SystemClock_elapsedRealtimeNano(JNIEnv* env,
167 jobject clazz)
168 {
169 return (jlong)elapsedRealtimeNano();
170 }
171
172 /*
173 * JNI registration.
174 */
175 static JNINativeMethod gMethods[] = {
176 /* name, signature, funcPtr */
177 { "setCurrentTimeMillis", "(J)Z",
178 (void*) android_os_SystemClock_setCurrentTimeMillis },
179 { "uptimeMillis", "()J",
180 (void*) android_os_SystemClock_uptimeMillis },
181 { "elapsedRealtime", "()J",
182 (void*) android_os_SystemClock_elapsedRealtime },
183 { "currentThreadTimeMillis", "()J",
184 (void*) android_os_SystemClock_currentThreadTimeMillis },
185 { "currentThreadTimeMicro", "()J",
186 (void*) android_os_SystemClock_currentThreadTimeMicro },
187 { "currentTimeMicro", "()J",
188 (void*) android_os_SystemClock_currentTimeMicro },
189 { "elapsedRealtimeNanos", "()J",
190 (void*) android_os_SystemClock_elapsedRealtimeNano },
191 };
register_android_os_SystemClock(JNIEnv * env)192 int register_android_os_SystemClock(JNIEnv* env)
193 {
194 return AndroidRuntime::registerNativeMethods(env,
195 "android/os/SystemClock", gMethods, NELEM(gMethods));
196 }
197
198 }; // namespace android
199
200