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/*
* Copyright (C) 2008 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.
*/
/*
* System clock functions.
*/
#ifdef HAVE_ANDROID_OS
#include <linux/ioctl.h>
#include <linux/rtc.h>
#include <utils/Atomic.h>
#include <linux/android_alarm.h>
#endif
#include <sys/time.h>
#include <limits.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <utils/SystemClock.h>
#include <utils/Timers.h>
#define LOG_TAG "SystemClock"
#include "utils/Log.h"
namespace android {
/*
* Set the current time. This only works when running as root.
*/
int setCurrentTimeMillis(int64_t millis)
{
#if WIN32
// not implemented
return -1;
#else
struct timeval tv;
#ifdef HAVE_ANDROID_OS
struct timespec ts;
int fd;
int res;
#endif
int ret = 0;
if (millis <= 0 || millis / 1000LL >= INT_MAX) {
return -1;
}
tv.tv_sec = (time_t) (millis / 1000LL);
tv.tv_usec = (suseconds_t) ((millis % 1000LL) * 1000LL);
ALOGD("Setting time of day to sec=%d\n", (int) tv.tv_sec);
#ifdef HAVE_ANDROID_OS
fd = open("/dev/alarm", O_RDWR);
if(fd < 0) {
ALOGW("Unable to open alarm driver: %s\n", strerror(errno));
return -1;
}
ts.tv_sec = tv.tv_sec;
ts.tv_nsec = tv.tv_usec * 1000;
res = ioctl(fd, ANDROID_ALARM_SET_RTC, &ts);
if(res < 0) {
ALOGW("Unable to set rtc to %ld: %s\n", tv.tv_sec, strerror(errno));
ret = -1;
}
close(fd);
#else
if (settimeofday(&tv, NULL) != 0) {
ALOGW("Unable to set clock to %d.%d: %s\n",
(int) tv.tv_sec, (int) tv.tv_usec, strerror(errno));
ret = -1;
}
#endif
return ret;
#endif // WIN32
}
/*
* native public static long uptimeMillis();
*/
int64_t uptimeMillis()
{
int64_t when = systemTime(SYSTEM_TIME_MONOTONIC);
return (int64_t) nanoseconds_to_milliseconds(when);
}
/*
* native public static long elapsedRealtime();
*/
int64_t elapsedRealtime()
{
#ifdef HAVE_ANDROID_OS
static int s_fd = -1;
if (s_fd == -1) {
int fd = open("/dev/alarm", O_RDONLY);
if (android_atomic_cmpxchg(-1, fd, &s_fd)) {
close(fd);
}
}
struct timespec ts;
int result = ioctl(s_fd,
ANDROID_ALARM_GET_TIME(ANDROID_ALARM_ELAPSED_REALTIME), &ts);
if (result == 0) {
int64_t when = seconds_to_nanoseconds(ts.tv_sec) + ts.tv_nsec;
return (int64_t) nanoseconds_to_milliseconds(when);
} else {
// XXX: there was an error, probably because the driver didn't
// exist ... this should return
// a real error, like an exception!
int64_t when = systemTime(SYSTEM_TIME_MONOTONIC);
return (int64_t) nanoseconds_to_milliseconds(when);
}
#else
int64_t when = systemTime(SYSTEM_TIME_MONOTONIC);
return (int64_t) nanoseconds_to_milliseconds(when);
#endif
}
}; // namespace android
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