9d6d030f83
The first field in /proc/uptime is bootbased time, not monotonic time. If the kernel tracks bootbased time correctly, it counts elapsed run time as well as sleep time, which is the same as the elapsed time in the android alarm driver, and sleep time is always returned as 0. Use clock_gettime(CLOCK_MONOTONIC) instead, which will return elapsed run time not counting sleep time on all platforms. Change-Id: I28a22e8c93d78f62666ee8c877c7c6718a2b640a
111 lines
3.5 KiB
C
111 lines
3.5 KiB
C
/*
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* Copyright (c) 2010, The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Google, Inc. nor the names of its contributors
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* may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/time.h>
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#include <linux/ioctl.h>
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#include <linux/rtc.h>
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#include <linux/android_alarm.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <time.h>
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static void format_time(int time, char* buffer) {
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int seconds, minutes, hours, days;
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seconds = time % 60;
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time /= 60;
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minutes = time % 60;
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time /= 60;
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hours = time % 24;
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days = time / 24;
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if (days > 0)
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sprintf(buffer, "%d days, %02d:%02d:%02d", days, hours, minutes, seconds);
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else
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sprintf(buffer, "%02d:%02d:%02d", hours, minutes, seconds);
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}
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int64_t elapsedRealtime()
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{
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struct timespec ts;
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int fd, result;
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fd = open("/dev/alarm", O_RDONLY);
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if (fd < 0)
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return fd;
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result = ioctl(fd, ANDROID_ALARM_GET_TIME(ANDROID_ALARM_ELAPSED_REALTIME), &ts);
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close(fd);
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if (result == 0)
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return ts.tv_sec;
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return -1;
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}
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int uptime_main(int argc, char *argv[])
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{
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float up_time, idle_time;
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char up_string[100], idle_string[100], sleep_string[100];
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int elapsed;
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struct timespec up_timespec;
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FILE* file = fopen("/proc/uptime", "r");
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if (!file) {
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fprintf(stderr, "Could not open /proc/uptime\n");
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return -1;
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}
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if (fscanf(file, "%*f %f", &idle_time) != 1) {
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fprintf(stderr, "Could not parse /proc/uptime\n");
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fclose(file);
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return -1;
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}
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fclose(file);
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if (clock_gettime(CLOCK_MONOTONIC, &up_timespec) < 0) {
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fprintf(stderr, "Could not get monotonic time\n");
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return -1;
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}
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up_time = up_timespec.tv_sec + up_timespec.tv_nsec / 1e9;
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elapsed = elapsedRealtime();
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if (elapsed < 0) {
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fprintf(stderr, "elapsedRealtime failed\n");
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return -1;
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}
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format_time(elapsed, up_string);
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format_time((int)idle_time, idle_string);
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format_time((int)(elapsed - up_time), sleep_string);
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printf("up time: %s, idle time: %s, sleep time: %s\n", up_string, idle_string, sleep_string);
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return 0;
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}
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