JDK 11 jdk.jdi.jmod is the JMOD file for JDK 11 JDI (Java Debug Interface) tool.

JDK 11 JDI tool compiled class files are stored in \fyicenter\jdk-11.0.1\jmods\jdk.jdi.jmod.

JDK 11 JDI tool compiled class files are also linked and stored in the \fyicenter\jdk-11.0.1\lib\modules JImage file.

JDK 11 JDI tool source code files are stored in \fyicenter\jdk-11.0.1\lib\src.zip\jdk.jdi.

You can click and view the content of each source code file in the list below.

⏎ com/sun/tools/jdi/SocketTransportService.java

/*
 * Copyright (c) 1998, 2017, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 */

package com.sun.tools.jdi;

import java.io.IOException;
import java.net.Inet6Address;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.SocketTimeoutException;
import java.net.UnknownHostException;
import java.util.ResourceBundle;

import com.sun.jdi.connect.TransportTimeoutException;
import com.sun.jdi.connect.spi.Connection;
import com.sun.jdi.connect.spi.TransportService;

/*
 * A transport service based on a TCP connection between the
 * debugger and debugee.
 */

public class SocketTransportService extends TransportService {
    private ResourceBundle messages = null;

    /**
     * The listener returned by startListening encapsulates
     * the ServerSocket.
     */
    static class SocketListenKey extends ListenKey {
        ServerSocket ss;

        SocketListenKey(ServerSocket ss) {
            this.ss = ss;
        }

        ServerSocket socket() {
            return ss;
        }

        /*
         * Returns the string representation of the address that this
         * listen key represents.
         */
        public String address() {
            InetAddress address = ss.getInetAddress();

            /*
             * If bound to the wildcard address then use current local
             * hostname. In the event that we don't know our own hostname
             * then assume that host supports IPv4 and return something to
             * represent the loopback address.
             */
            if (address.isAnyLocalAddress()) {
                try {
                    address = InetAddress.getLocalHost();
                } catch (UnknownHostException uhe) {
                    byte[] loopback = {0x7f,0x00,0x00,0x01};
                    try {
                        address = InetAddress.getByAddress("127.0.0.1", loopback);
                    } catch (UnknownHostException x) {
                        throw new InternalError("unable to get local hostname");
                    }
                }
            }

            /*
             * Now decide if we return a hostname or IP address. Where possible
             * return a hostname but in the case that we are bound to an
             * address that isn't registered in the name service then we
             * return an address.
             */
            String result;
            String hostname = address.getHostName();
            String hostaddr = address.getHostAddress();
            if (hostname.equals(hostaddr)) {
                if (address instanceof Inet6Address) {
                    result = "[" + hostaddr + "]";
                } else {
                    result = hostaddr;
                }
            } else {
                result = hostname;
            }

            /*
             * Finally return "hostname:port", "ipv4-address:port" or
             * "[ipv6-address]:port".
             */
            return result + ":" + ss.getLocalPort();
        }

        public String toString() {
            return address();
        }
    }

    /**
     * Handshake with the debuggee
     */
    void handshake(Socket s, long timeout) throws IOException {
        s.setSoTimeout((int)timeout);

        byte[] hello = "JDWP-Handshake".getBytes("UTF-8");
        s.getOutputStream().write(hello);

        byte[] b = new byte[hello.length];
        int received = 0;
        while (received < hello.length) {
            int n;
            try {
                n = s.getInputStream().read(b, received, hello.length-received);
            } catch (SocketTimeoutException x) {
                throw new IOException("handshake timeout");
            }
            if (n < 0) {
                s.close();
                throw new IOException("handshake failed - connection prematurally closed");
            }
            received += n;
        }
        for (int i=0; i<hello.length; i++) {
            if (b[i] != hello[i]) {
                throw new IOException("handshake failed - unrecognized message from target VM");
            }
        }

        // disable read timeout
        s.setSoTimeout(0);
    }

    /**
     * No-arg constructor
     */
    public SocketTransportService() {
    }

    /**
     * The name of this transport service
     */
    public String name() {
        return "Socket";
    }

    /**
     * Return localized description of this transport service
     */
    public String description() {
        synchronized (this) {
            if (messages == null) {
                messages = ResourceBundle.getBundle("com.sun.tools.jdi.resources.jdi");
            }
        }
        return messages.getString("socket_transportservice.description");
    }

    /**
     * Return the capabilities of this transport service
     */
    public Capabilities capabilities() {
        return new TransportService.Capabilities() {
            public boolean supportsMultipleConnections() {
                return true;
            }

            public boolean supportsAttachTimeout() {
                return true;
            }

            public boolean supportsAcceptTimeout() {
                return true;
            }

            public boolean supportsHandshakeTimeout() {
                return true;
            }
        };
    }

    /**
     * Attach to the specified address with optional attach and handshake
     * timeout.
     */
    public Connection attach(String address, long attachTimeout, long handshakeTimeout)
        throws IOException {

        if (address == null) {
            throw new NullPointerException("address is null");
        }
        if (attachTimeout < 0 || handshakeTimeout < 0) {
            throw new IllegalArgumentException("timeout is negative");
        }

        int splitIndex = address.indexOf(':');
        String host;
        String portStr;
        if (splitIndex < 0) {
            host = "localhost";
            portStr = address;
        } else {
            host = address.substring(0, splitIndex);
            portStr = address.substring(splitIndex+1);
        }

        if (host.equals("*")) {
            host = InetAddress.getLocalHost().getHostName();
        }

        int port;
        try {
            port = Integer.decode(portStr).intValue();
        } catch (NumberFormatException e) {
            throw new IllegalArgumentException(
                "unable to parse port number in address");
        }

        // open TCP connection to VM
        InetSocketAddress sa = new InetSocketAddress(host, port);
        Socket s = new Socket();
        try {
            s.connect(sa, (int)attachTimeout);
        } catch (SocketTimeoutException exc) {
            try {
                s.close();
            } catch (IOException x) { }
            throw new TransportTimeoutException("timed out trying to establish connection");
        }

        // handshake with the target VM
        try {
            handshake(s, handshakeTimeout);
        } catch (IOException exc) {
            try {
                s.close();
            } catch (IOException x) { }
            throw exc;
        }

        return new SocketConnection(s);
    }

    /*
     * Listen on the specified address and port. Return a listener
     * that encapsulates the ServerSocket.
     */
    ListenKey startListening(String localaddress, int port) throws IOException {
        InetSocketAddress sa;
        if (localaddress == null) {
            sa = new InetSocketAddress(port);
        } else {
            sa = new InetSocketAddress(localaddress, port);
        }
        ServerSocket ss = new ServerSocket();
        if (port == 0) {
            // Only need SO_REUSEADDR if we're using a fixed port. If we
            // start seeing EADDRINUSE due to collisions in free ports
            // then we should retry the bind() a few times.
            ss.setReuseAddress(false);
        }
        ss.bind(sa);
        return new SocketListenKey(ss);
    }

    /**
     * Listen on the specified address
     */
    public ListenKey startListening(String address) throws IOException {
        // use ephemeral port if address isn't specified.
        if (address == null || address.length() == 0) {
            address = "0";
        }

        int splitIndex = address.indexOf(':');
        String localaddr = null;
        if (splitIndex >= 0) {
            localaddr = address.substring(0, splitIndex);
            address = address.substring(splitIndex+1);
        }

        int port;
        try {
            port = Integer.decode(address).intValue();
        } catch (NumberFormatException e) {
            throw new IllegalArgumentException(
                    "unable to parse port number in address");
        }

        return startListening(localaddr, port);
    }

    /**
     * Listen on the default address
     */
    public ListenKey startListening() throws IOException {
        return startListening(null, 0);
    }

    /**
     * Stop the listener
     */
    public void stopListening(ListenKey listener) throws IOException {
        if (!(listener instanceof SocketListenKey)) {
            throw new IllegalArgumentException("Invalid listener");
        }

        synchronized (listener) {
            ServerSocket ss = ((SocketListenKey)listener).socket();

            // if the ServerSocket has been closed it means
            // the listener is invalid
            if (ss.isClosed()) {
                throw new IllegalArgumentException("Invalid listener");
            }
            ss.close();
        }
    }

    /**
     * Accept a connection from a debuggee and handshake with it.
     */
    public Connection accept(ListenKey listener, long acceptTimeout, long handshakeTimeout) throws IOException {
        if (acceptTimeout < 0 || handshakeTimeout < 0) {
            throw new IllegalArgumentException("timeout is negative");
        }
        if (!(listener instanceof SocketListenKey)) {
            throw new IllegalArgumentException("Invalid listener");
        }
        ServerSocket ss;

        // obtain the ServerSocket from the listener - if the
        // socket is closed it means the listener is invalid
        synchronized (listener) {
            ss = ((SocketListenKey)listener).socket();
            if (ss.isClosed()) {
               throw new IllegalArgumentException("Invalid listener");
            }
        }

        // from here onwards it's possible that the ServerSocket
        // may be closed by a call to stopListening - that's okay
        // because the ServerSocket methods will throw an
        // IOException indicating the socket is closed.
        //
        // Additionally, it's possible that another thread calls accept
        // with a different accept timeout - that creates a same race
        // condition between setting the timeout and calling accept.
        // As it is such an unlikely scenario (requires both threads
        // to be using the same listener we've chosen to ignore the issue).

        ss.setSoTimeout((int)acceptTimeout);
        Socket s;
        try {
            s = ss.accept();
        } catch (SocketTimeoutException x) {
            throw new TransportTimeoutException("timeout waiting for connection");
        }

        // handshake here
        handshake(s, handshakeTimeout);

        return new SocketConnection(s);
    }

    public String toString() {
       return name();
    }
}

⏎ com/sun/tools/jdi/SocketTransportService.java

Or download all of them as a single archive file:

File name: jdk.jdi-11.0.1-src.zip
File size: 464844 bytes
Release date: 2018-11-04
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