001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache license, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the license for the specific language governing permissions and
015 * limitations under the license.
016 */
017package org.apache.logging.log4j.util;
018
019import java.io.File;
020import java.io.IOException;
021import java.lang.reflect.Method;
022
023/**
024 * @Since 2.9
025 */
026public class ProcessIdUtil {
027
028    public static final String DEFAULT_PROCESSID = "-";
029
030    public static String getProcessId() {
031        try {
032            // LOG4J2-2126 use reflection to improve compatibility with Android Platform which does not support JMX extensions
033            Class<?> managementFactoryClass = Class.forName("java.lang.management.ManagementFactory");
034            Method getRuntimeMXBean = managementFactoryClass.getDeclaredMethod("getRuntimeMXBean");
035            Class<?> runtimeMXBeanClass = Class.forName("java.lang.management.RuntimeMXBean");
036            Method getName = runtimeMXBeanClass.getDeclaredMethod("getName");
037
038            Object runtimeMXBean = getRuntimeMXBean.invoke(null);
039            String name = (String) getName.invoke(runtimeMXBean);
040            //String name = ManagementFactory.getRuntimeMXBean().getName(); //JMX not allowed on Android
041            return name.split("@")[0]; // likely works on most platforms
042        } catch (final Exception ex) {
043            try {
044                return new File("/proc/self").getCanonicalFile().getName(); // try a Linux-specific way
045            } catch (final IOException ignoredUseDefault) {
046                // Ignore exception.
047            }
048        }
049        return DEFAULT_PROCESSID;
050    }
051}