toolbox: add "uptime" command

	top \

	iftop \

	id \

	uptime \

	vmstat

LOCAL_SRC_FILES:= \

/*

 * Copyright (C) 2010 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 <sys/time.h>

#include <linux/ioctl.h>

#include <linux/rtc.h>

#include <linux/android_alarm.h>

#include <fcntl.h>

#include <stdio.h>

static void format_time(int time, char* buffer) {

    int seconds, minutes, hours, days;

    seconds = time % 60;

    time /= 60;

    minutes = time % 60;

    time /= 60;

    hours = time % 24;

    days = time / 24;

    if (days > 0)

        sprintf(buffer, "%d days, %02d:%02d:%02d", days, hours, minutes, seconds);

    else

        sprintf(buffer, "%02d:%02d:%02d", hours, minutes, seconds);

}

int64_t elapsedRealtime()

{

    struct timespec ts;

    int fd, result;

    fd = open("/dev/alarm", O_RDONLY);

    if (fd < 0)

        return fd;

   result = ioctl(fd, ANDROID_ALARM_GET_TIME(ANDROID_ALARM_ELAPSED_REALTIME), &ts);

   close(fd);

    if (result == 0)

        return ts.tv_sec;

    return -1;

}

int uptime_main(int argc, char *argv[])

{

    float up_time, idle_time;

    char up_string[100], idle_string[100], sleep_string[100];

    int elapsed;

    FILE* file = fopen("/proc/uptime", "r");

    if (!file) {

        fprintf(stderr, "Could not open /proc/uptime\n");

        return -1;

    }

    if (fscanf(file, "%f %f", &up_time, &idle_time) != 2) {

        fprintf(stderr, "Could not parse /proc/uptime\n");

        fclose(file);

        return -1;

    }

    fclose(file);

    elapsed = elapsedRealtime();

    if (elapsed < 0) {

        fprintf(stderr, "elapsedRealtime failed\n");

        return -1;

    }

    format_time(elapsed, up_string);

    format_time((int)idle_time, idle_string);

    format_time((int)(elapsed - up_time), sleep_string);

    printf("up time: %s, idle time: %s, sleep time: %s\n", up_string, idle_string, sleep_string);

    return 0;

}