oshi.util.LsofUtil 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.util;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import oshi.annotation.concurrent.ThreadSafe;
/**
* Reads from lsof into a map
*/
@ThreadSafe
public final class LsofUtil {
private LsofUtil() {
}
/**
* Gets a map containing current working directory info
*
* @param pid
* a process ID, optional
* @return a map of process IDs to their current working directory. If
* {@code pid} is a negative number, all processes are returned;
* otherwise the map may contain only a single element for {@code pid}
*/
public static Map getCwdMap(int pid) {
List lsof = ExecutingCommand.runNative("lsof -Fn -d cwd" + (pid < 0 ? "" : " -p " + pid));
Map cwdMap = new HashMap<>();
Integer key = -1;
for (String line : lsof) {
if (line.isEmpty()) {
continue;
}
switch (line.charAt(0)) {
case 'p':
key = ParseUtil.parseIntOrDefault(line.substring(1), -1);
break;
case 'n':
cwdMap.put(key, line.substring(1));
break;
case 'f':
// ignore the 'cwd' file descriptor
default:
break;
}
}
return cwdMap;
}
/**
* Gets current working directory info
*
* @param pid
* a process ID
* @return the current working directory for that process.
*/
public static String getCwd(int pid) {
List lsof = ExecutingCommand.runNative("lsof -Fn -d cwd -p " + pid);
for (String line : lsof) {
if (!line.isEmpty() && line.charAt(0) == 'n') {
return line.substring(1).trim();
}
}
return "";
}
/**
* Gets open files
*
* @param pid
* The process ID
* @return the number of open files.
*/
public static long getOpenFiles(int pid) {
// subtract 1 from size for header
return ExecutingCommand.runNative(String.format("lsof -p %d", pid)).size() - 1L;
}
}