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 <errno.h>
33#include <stdio.h>
34#include <string.h>
35#include <time.h>
36
37static void format_time(int time, char* buffer) {
38    int seconds = time % 60;
39    time /= 60;
40    int minutes = time % 60;
41    time /= 60;
42    int hours = time % 24;
43    int days = time / 24;
44
45    if (days > 0) {
46        sprintf(buffer, "%d day%s, %02d:%02d:%02d", days, (days == 1) ? "" : "s", hours, minutes, seconds);
47    } else {
48        sprintf(buffer, "%02d:%02d:%02d", hours, minutes, seconds);
49    }
50}
51
52int uptime_main(int argc __attribute__((unused)), char *argv[] __attribute__((unused))) {
53    FILE* file = fopen("/proc/uptime", "r");
54    if (!file) {
55        fprintf(stderr, "Could not open /proc/uptime\n");
56        return -1;
57    }
58    float idle_time;
59    if (fscanf(file, "%*f %f", &idle_time) != 1) {
60        fprintf(stderr, "Could not parse /proc/uptime\n");
61        fclose(file);
62        return -1;
63    }
64    fclose(file);
65
66    struct timespec up_timespec;
67    if (clock_gettime(CLOCK_MONOTONIC, &up_timespec) == -1) {
68        fprintf(stderr, "Could not get monotonic time: %s\n", strerror(errno));
69	return -1;
70    }
71    float up_time = up_timespec.tv_sec + up_timespec.tv_nsec / 1e9;
72
73    struct timespec elapsed_timespec;
74    if (clock_gettime(CLOCK_BOOTTIME, &elapsed_timespec) == -1) {
75        fprintf(stderr, "Could not get boot time: %s\n", strerror(errno));
76        return -1;
77    }
78    int elapsed = elapsed_timespec.tv_sec;
79
80    char up_string[100], idle_string[100], sleep_string[100];
81    format_time(elapsed, up_string);
82    format_time((int)idle_time, idle_string);
83    format_time((int)(elapsed - up_time), sleep_string);
84    printf("up time: %s, idle time: %s, sleep time: %s\n", up_string, idle_string, sleep_string);
85
86    return 0;
87}
88