uptime.c revision a699d6256fca0336b173c524c5b3d8f7d4fcdc25 
1/*
2 * Copyright (C) 2010 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#include <sys/time.h>
18#include <linux/ioctl.h>
19#include <linux/rtc.h>
20#include <linux/android_alarm.h>
21#include <fcntl.h>
22#include <stdio.h>
23
24
25static void format_time(int time, char* buffer) {
26    int seconds, minutes, hours, days;
27
28    seconds = time % 60;
29    time /= 60;
30    minutes = time % 60;
31    time /= 60;
32    hours = time % 24;
33    days = time / 24;
34
35    if (days > 0)
36        sprintf(buffer, "%d days, %02d:%02d:%02d", days, hours, minutes, seconds);
37    else
38        sprintf(buffer, "%02d:%02d:%02d", hours, minutes, seconds);
39}
40
41int64_t elapsedRealtime()
42{
43    struct timespec ts;
44    int fd, result;
45
46    fd = open("/dev/alarm", O_RDONLY);
47    if (fd < 0)
48        return fd;
49
50   result = ioctl(fd, ANDROID_ALARM_GET_TIME(ANDROID_ALARM_ELAPSED_REALTIME), &ts);
51   close(fd);
52
53    if (result == 0)
54        return ts.tv_sec;
55    return -1;
56}
57
58int uptime_main(int argc, char *argv[])
59{
60    float up_time, idle_time;
61    char up_string[100], idle_string[100], sleep_string[100];
62    int elapsed;
63
64    FILE* file = fopen("/proc/uptime", "r");
65    if (!file) {
66        fprintf(stderr, "Could not open /proc/uptime\n");
67        return -1;
68    }
69    if (fscanf(file, "%f %f", &up_time, &idle_time) != 2) {
70        fprintf(stderr, "Could not parse /proc/uptime\n");
71        fclose(file);
72        return -1;
73    }
74    fclose(file);
75
76    elapsed = elapsedRealtime();
77    if (elapsed < 0) {
78        fprintf(stderr, "elapsedRealtime failed\n");
79        return -1;
80    }
81
82    format_time(elapsed, up_string);
83    format_time((int)idle_time, idle_string);
84    format_time((int)(elapsed - up_time), sleep_string);
85    printf("up time: %s, idle time: %s, sleep time: %s\n", up_string, idle_string, sleep_string);
86
87    return 0;
88}
89