uptime.c revision 53308d4cd5c4414402e979a6771f7ef3b35f5c2f 
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
39
40static void format_time(int time, char* buffer) {
41    int seconds, minutes, hours, days;
42
43    seconds = time % 60;
44    time /= 60;
45    minutes = time % 60;
46    time /= 60;
47    hours = time % 24;
48    days = time / 24;
49
50    if (days > 0)
51        sprintf(buffer, "%d days, %02d:%02d:%02d", days, hours, minutes, seconds);
52    else
53        sprintf(buffer, "%02d:%02d:%02d", hours, minutes, seconds);
54}
55
56int64_t elapsedRealtime()
57{
58    struct timespec ts;
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    if (result == 0)
69        return ts.tv_sec;
70    return -1;
71}
72
73int uptime_main(int argc, char *argv[])
74{
75    float up_time, idle_time;
76    char up_string[100], idle_string[100], sleep_string[100];
77    int elapsed;
78
79    FILE* file = fopen("/proc/uptime", "r");
80    if (!file) {
81        fprintf(stderr, "Could not open /proc/uptime\n");
82        return -1;
83    }
84    if (fscanf(file, "%f %f", &up_time, &idle_time) != 2) {
85        fprintf(stderr, "Could not parse /proc/uptime\n");
86        fclose(file);
87        return -1;
88    }
89    fclose(file);
90
91    elapsed = elapsedRealtime();
92    if (elapsed < 0) {
93        fprintf(stderr, "elapsedRealtime failed\n");
94        return -1;
95    }
96
97    format_time(elapsed, up_string);
98    format_time((int)idle_time, idle_string);
99    format_time((int)(elapsed - up_time), sleep_string);
100    printf("up time: %s, idle time: %s, sleep time: %s\n", up_string, idle_string, sleep_string);
101
102    return 0;
103}
104