uptime.c revision fa66f1e49458e7745511416d72ac15c190a13e6f 
1/*
2 * Copyright (c) 2010, The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *  * Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 *  * Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in
12 *    the documentation and/or other materials provided with the
13 *    distribution.
14 *  * Neither the name of Google, Inc. nor the names of its contributors
15 *    may be used to endorse or promote products derived from this
16 *    software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
21 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
22 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
24 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
25 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
26 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
27 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
28 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/time.h>
33#include <linux/ioctl.h>
34#include <linux/rtc.h>
35#include <linux/android_alarm.h>
36#include <fcntl.h>
37#include <stdio.h>
38#include <time.h>
39
40
41static void format_time(int time, char* buffer) {
42    int seconds, minutes, hours, days;
43
44    seconds = time % 60;
45    time /= 60;
46    minutes = time % 60;
47    time /= 60;
48    hours = time % 24;
49    days = time / 24;
50
51    if (days > 0)
52        sprintf(buffer, "%d days, %02d:%02d:%02d", days, hours, minutes, seconds);
53    else
54        sprintf(buffer, "%02d:%02d:%02d", hours, minutes, seconds);
55}
56
57static int elapsedRealtimeAlarm(struct timespec *ts)
58{
59    int fd, result;
60
61    fd = open("/dev/alarm", O_RDONLY);
62    if (fd < 0)
63        return fd;
64
65    result = ioctl(fd, ANDROID_ALARM_GET_TIME(ANDROID_ALARM_ELAPSED_REALTIME), ts);
66    close(fd);
67
68    return result;
69}
70
71int64_t elapsedRealtime()
72{
73    struct timespec ts;
74
75    int result = elapsedRealtimeAlarm(&ts);
76    if (result < 0)
77        result = clock_gettime(CLOCK_BOOTTIME, &ts);
78
79    if (result == 0)
80        return ts.tv_sec;
81    return -1;
82}
83
84int uptime_main(int argc __attribute__((unused)),
85        char *argv[] __attribute__((unused)))
86{
87    float up_time, idle_time;
88    char up_string[100], idle_string[100], sleep_string[100];
89    int elapsed;
90    struct timespec up_timespec;
91
92    FILE* file = fopen("/proc/uptime", "r");
93    if (!file) {
94        fprintf(stderr, "Could not open /proc/uptime\n");
95        return -1;
96    }
97    if (fscanf(file, "%*f %f", &idle_time) != 1) {
98        fprintf(stderr, "Could not parse /proc/uptime\n");
99        fclose(file);
100        return -1;
101    }
102    fclose(file);
103
104    if (clock_gettime(CLOCK_MONOTONIC, &up_timespec) < 0) {
105        fprintf(stderr, "Could not get monotonic time\n");
106	return -1;
107    }
108    up_time = up_timespec.tv_sec + up_timespec.tv_nsec / 1e9;
109
110    elapsed = elapsedRealtime();
111    if (elapsed < 0) {
112        fprintf(stderr, "elapsedRealtime failed\n");
113        return -1;
114    }
115
116    format_time(elapsed, up_string);
117    format_time((int)idle_time, idle_string);
118    format_time((int)(elapsed - up_time), sleep_string);
119    printf("up time: %s, idle time: %s, sleep time: %s\n", up_string, idle_string, sleep_string);
120
121    return 0;
122}
123