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
44namespace android {
45
46/*
47 * Set the current time.  This only works when running as root.
48 */
49static 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 */
87static 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 */
96static 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 */
105static 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 */
114static 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 */
134static 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 */
154static 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 */
166static jlong android_os_SystemClock_elapsedRealtimeNano(JNIEnv* env,
167        jobject clazz)
168{
169    return (jlong)elapsedRealtimeNano();
170}
171
172/*
173 * JNI registration.
174 */
175static 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};
192int 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