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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.lttng.scope.lttng.kernel.core.analysis.os.handlers.internal; | |
14 | ||
15 | import org.eclipse.tracecompass.tmf.core.event.ITmfEvent; | |
16 | import org.eclipse.tracecompass.tmf.core.event.ITmfEventField; | |
17 | import org.lttng.scope.lttng.kernel.core.analysis.os.Attributes; | |
18 | import org.lttng.scope.lttng.kernel.core.analysis.os.StateValues; | |
19 | import org.lttng.scope.lttng.kernel.core.trace.layout.ILttngKernelEventLayout; | |
20 | ||
21 | import ca.polymtl.dorsal.libdelorean.ITmfStateSystemBuilder; | |
22 | import ca.polymtl.dorsal.libdelorean.exceptions.AttributeNotFoundException; | |
23 | import ca.polymtl.dorsal.libdelorean.statevalue.ITmfStateValue; | |
24 | import ca.polymtl.dorsal.libdelorean.statevalue.TmfStateValue; | |
25 | ||
26 | /** | |
27 | * Fork Handler | |
28 | */ | |
29 | public class ProcessForkHandler extends KernelEventHandler { | |
30 | ||
31 | /** | |
32 | * Constructor | |
33 | * | |
34 | * @param layout | |
35 | * event layout | |
36 | */ | |
37 | public ProcessForkHandler(ILttngKernelEventLayout layout) { | |
38 | super(layout); | |
39 | } | |
40 | ||
41 | @Override | |
42 | public void handleEvent(ITmfStateSystemBuilder ss, ITmfEvent event) throws AttributeNotFoundException { | |
43 | ITmfEventField content = event.getContent(); | |
44 | Integer cpu = KernelEventHandlerUtils.getCpu(event); | |
45 | String childProcessName = (String) content.getField(getLayout().fieldChildComm()).getValue(); | |
46 | ||
47 | Integer parentTid = ((Long) content.getField(getLayout().fieldParentTid()).getValue()).intValue(); | |
48 | Integer childTid = ((Long) content.getField(getLayout().fieldChildTid()).getValue()).intValue(); | |
49 | ||
50 | String parentThreadAttributeName = Attributes.buildThreadAttributeName(parentTid, cpu); | |
51 | if (parentThreadAttributeName == null) { | |
52 | return; | |
53 | } | |
54 | ||
55 | String childThreadAttributeName = Attributes.buildThreadAttributeName(childTid, cpu); | |
56 | if (childThreadAttributeName == null) { | |
57 | return; | |
58 | } | |
59 | ||
60 | final int threadsNode = KernelEventHandlerUtils.getNodeThreads(ss); | |
61 | Integer parentTidNode = ss.getQuarkRelativeAndAdd(threadsNode, parentThreadAttributeName); | |
62 | Integer childTidNode = ss.getQuarkRelativeAndAdd(threadsNode, childThreadAttributeName); | |
63 | ||
64 | ||
65 | /* Assign the PPID to the new process */ | |
66 | int quark = ss.getQuarkRelativeAndAdd(childTidNode, Attributes.PPID); | |
67 | ITmfStateValue value = TmfStateValue.newValueInt(parentTid); | |
68 | long timestamp = KernelEventHandlerUtils.getTimestamp(event); | |
69 | ss.modifyAttribute(timestamp, value, quark); | |
70 | ||
71 | /* Set the new process' exec_name */ | |
72 | quark = ss.getQuarkRelativeAndAdd(childTidNode, Attributes.EXEC_NAME); | |
73 | value = TmfStateValue.newValueString(childProcessName); | |
74 | ss.modifyAttribute(timestamp, value, quark); | |
75 | ||
76 | /* | |
77 | * Set the new process' status, it is initially in a blocked state. A | |
78 | * subsequent sched_wakeup_new will schedule it. | |
79 | */ | |
80 | value = StateValues.PROCESS_STATUS_WAIT_BLOCKED_VALUE; | |
81 | ss.modifyAttribute(timestamp, value, childTidNode); | |
82 | ||
83 | /* Set the process' syscall name, to be the same as the parent's */ | |
84 | quark = ss.getQuarkRelativeAndAdd(parentTidNode, Attributes.SYSTEM_CALL); | |
85 | value = ss.queryOngoingState(quark); | |
86 | if (!value.isNull()) { | |
87 | quark = ss.getQuarkRelativeAndAdd(childTidNode, Attributes.SYSTEM_CALL); | |
88 | ss.modifyAttribute(timestamp, value, quark); | |
89 | } | |
90 | ||
91 | } | |
92 | } |