oshi.driver.linux.proc.UpTime Maven / Gradle / Ivy
/**
* MIT License
*
* Copyright (c) 2010 - 2020 The OSHI Project Contributors: https://github.com/oshi/oshi/graphs/contributors
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package oshi.driver.linux.proc;
import oshi.annotation.concurrent.ThreadSafe;
import oshi.util.FileUtil;
import oshi.util.platform.linux.ProcPath;
/**
* Utility to read system uptime from {@code /proc/uptime}
*/
@ThreadSafe
public final class UpTime {
private UpTime() {
}
/**
* Parses the first value in {@code /proc/uptime} for seconds since boot
*
* @return Seconds since boot
*/
public static double getSystemUptimeSeconds() {
String uptime = FileUtil.getStringFromFile(ProcPath.UPTIME);
int spaceIndex = uptime.indexOf(' ');
try {
if (spaceIndex < 0) {
// No space, error
return 0d;
} else {
return Double.parseDouble(uptime.substring(0, spaceIndex));
}
} catch (NumberFormatException nfe) {
return 0d;
}
}
}