analysis/org.eclipse.tracecompass.analysis.os.linux.core/src/org/eclipse/tracecompass/internal/analysis/os/linux/core/kernel/handlers/ProcessForkHandler.java

   1 /*******************************************************************************
   2  * Copyright (c) 2015 Ericsson
   3  *
   4  * All rights reserved. This program and the accompanying materials
   5  * are made available under the terms of the Eclipse Public License v1.0
   6  * which accompanies this distribution, and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  * Contributors:
  10  *    Matthew Khouzam - Initial API and implementation
  11  *******************************************************************************/
  12
  13 package org.eclipse.tracecompass.internal.analysis.os.linux.core.kernel.handlers;
  14
  15 import org.eclipse.tracecompass.analysis.os.linux.core.kernel.StateValues;
  16 import org.eclipse.tracecompass.analysis.os.linux.core.trace.IKernelAnalysisEventLayout;
  17 import org.eclipse.tracecompass.internal.analysis.os.linux.core.kernel.Attributes;
  18 import org.eclipse.tracecompass.statesystem.core.ITmfStateSystemBuilder;
  19 import org.eclipse.tracecompass.statesystem.core.exceptions.AttributeNotFoundException;
  20 import org.eclipse.tracecompass.statesystem.core.statevalue.ITmfStateValue;
  21 import org.eclipse.tracecompass.statesystem.core.statevalue.TmfStateValue;
  22 import org.eclipse.tracecompass.tmf.core.event.ITmfEvent;
  23 import org.eclipse.tracecompass.tmf.core.event.ITmfEventField;
  24
  25 /**
  26  * Fork Handler
  27  */
  28 public class ProcessForkHandler extends KernelEventHandler {
  29
  30     /**
  31      * Constructor
  32      *
  33      * @param layout
  34      *            event layout
  35      */
  36     public ProcessForkHandler(IKernelAnalysisEventLayout layout) {
  37         super(layout);
  38     }
  39
  40     @Override
  41     public void handleEvent(ITmfStateSystemBuilder ss, ITmfEvent event) throws AttributeNotFoundException {
  42         ITmfEventField content = event.getContent();
  43         Integer cpu = KernelEventHandlerUtils.getCpu(event);
  44         String childProcessName = (String) content.getField(getLayout().fieldChildComm()).getValue();
  45
  46         Integer parentTid = ((Long) content.getField(getLayout().fieldParentTid()).getValue()).intValue();
  47         Integer childTid = ((Long) content.getField(getLayout().fieldChildTid()).getValue()).intValue();
  48
  49         String parentThreadAttributeName = Attributes.buildThreadAttributeName(parentTid, cpu);
  50         if (parentThreadAttributeName == null) {
  51             return;
  52         }
  53
  54         String childThreadAttributeName = Attributes.buildThreadAttributeName(childTid, cpu);
  55         if (childThreadAttributeName == null) {
  56             return;
  57         }
  58
  59         final int threadsNode = KernelEventHandlerUtils.getNodeThreads(ss);
  60         Integer parentTidNode = ss.getQuarkRelativeAndAdd(threadsNode, parentThreadAttributeName);
  61         Integer childTidNode = ss.getQuarkRelativeAndAdd(threadsNode, childThreadAttributeName);
  62
  63
  64         /* Assign the PPID to the new process */
  65         int quark = ss.getQuarkRelativeAndAdd(childTidNode, Attributes.PPID);
  66         ITmfStateValue value = TmfStateValue.newValueInt(parentTid);
  67         long timestamp = KernelEventHandlerUtils.getTimestamp(event);
  68         ss.modifyAttribute(timestamp, value, quark);
  69
  70         /* Set the new process' exec_name */
  71         quark = ss.getQuarkRelativeAndAdd(childTidNode, Attributes.EXEC_NAME);
  72         value = TmfStateValue.newValueString(childProcessName);
  73         ss.modifyAttribute(timestamp, value, quark);
  74
  75         /* Set the new process' status */
  76         value = StateValues.PROCESS_STATUS_WAIT_FOR_CPU_VALUE;
  77         ss.modifyAttribute(timestamp, value, childTidNode);
  78
  79         /* Set the process's run queue, to be the same as the parent's */
  80         quark = ss.getQuarkRelativeAndAdd(parentTidNode, Attributes.CURRENT_CPU_RQ);
  81         value = ss.queryOngoingState(quark);
  82         quark = ss.getQuarkRelativeAndAdd(childTidNode, Attributes.CURRENT_CPU_RQ);
  83         ss.modifyAttribute(timestamp, value, quark);
  84
  85         /* Set the process' syscall name, to be the same as the parent's */
  86         quark = ss.getQuarkRelativeAndAdd(parentTidNode, Attributes.SYSTEM_CALL);
  87         value = ss.queryOngoingState(quark);
  88         if (!value.isNull()) {
  89             quark = ss.getQuarkRelativeAndAdd(childTidNode, Attributes.SYSTEM_CALL);
  90             ss.modifyAttribute(timestamp, value, quark);
  91         }
  92
  93     }
  94 }