/*******************************************************************************
* Copyright (c) 2015 Ericsson
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Matthew Khouzam - Initial API and implementation
*******************************************************************************/
package org.eclipse.tracecompass.internal.analysis.os.linux.core.kernel.handlers;
import org.eclipse.tracecompass.analysis.os.linux.core.kernel.StateValues;
import org.eclipse.tracecompass.analysis.os.linux.core.trace.IKernelAnalysisEventLayout;
import org.eclipse.tracecompass.internal.analysis.os.linux.core.kernel.Attributes;
import org.eclipse.tracecompass.statesystem.core.ITmfStateSystemBuilder;
import org.eclipse.tracecompass.statesystem.core.exceptions.AttributeNotFoundException;
import org.eclipse.tracecompass.statesystem.core.statevalue.ITmfStateValue;
import org.eclipse.tracecompass.statesystem.core.statevalue.TmfStateValue;
import org.eclipse.tracecompass.tmf.core.event.ITmfEvent;
import org.eclipse.tracecompass.tmf.core.event.ITmfEventField;
/**
* Fork Handler
*/
public class ProcessForkHandler extends KernelEventHandler {
/**
* Constructor
*
* @param layout
* event layout
*/
public ProcessForkHandler(IKernelAnalysisEventLayout layout) {
super(layout);
}
@Override
public void handleEvent(ITmfStateSystemBuilder ss, ITmfEvent event) throws AttributeNotFoundException {
ITmfEventField content = event.getContent();
Integer cpu = KernelEventHandlerUtils.getCpu(event);
String childProcessName = (String) content.getField(getLayout().fieldChildComm()).getValue();
Integer parentTid = ((Long) content.getField(getLayout().fieldParentTid()).getValue()).intValue();
Integer childTid = ((Long) content.getField(getLayout().fieldChildTid()).getValue()).intValue();
String parentThreadAttributeName = Attributes.buildThreadAttributeName(parentTid, cpu);
if (parentThreadAttributeName == null) {
return;
}
String childThreadAttributeName = Attributes.buildThreadAttributeName(childTid, cpu);
if (childThreadAttributeName == null) {
return;
}
final int threadsNode = KernelEventHandlerUtils.getNodeThreads(ss);
Integer parentTidNode = ss.getQuarkRelativeAndAdd(threadsNode, parentThreadAttributeName);
Integer childTidNode = ss.getQuarkRelativeAndAdd(threadsNode, childThreadAttributeName);
/* Assign the PPID to the new process */
int quark = ss.getQuarkRelativeAndAdd(childTidNode, Attributes.PPID);
ITmfStateValue value = TmfStateValue.newValueInt(parentTid);
long timestamp = KernelEventHandlerUtils.getTimestamp(event);
ss.modifyAttribute(timestamp, value, quark);
/* Set the new process' exec_name */
quark = ss.getQuarkRelativeAndAdd(childTidNode, Attributes.EXEC_NAME);
value = TmfStateValue.newValueString(childProcessName);
ss.modifyAttribute(timestamp, value, quark);
/* Set the new process' status */
value = StateValues.PROCESS_STATUS_WAIT_FOR_CPU_VALUE;
ss.modifyAttribute(timestamp, value, childTidNode);
/* Set the process' syscall name, to be the same as the parent's */
quark = ss.getQuarkRelativeAndAdd(parentTidNode, Attributes.SYSTEM_CALL);
value = ss.queryOngoingState(quark);
if (!value.isNull()) {
quark = ss.getQuarkRelativeAndAdd(childTidNode, Attributes.SYSTEM_CALL);
ss.modifyAttribute(timestamp, value, quark);
}
}
}