jdk-sandbox: comparison jdk/src/aix/classes/sun/tools/attach/AixVirtualMachine.java

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+:7515a991bb37
+/*
+* Copyright (c) 2008, 2013, Oracle and/or its affiliates. All rights reserved.
+* Copyright 2013 SAP AG. All rights reserved.
+* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+*
+* This code is free software; you can redistribute it and/or modify it
+* under the terms of the GNU General Public License version 2 only, as
+* published by the Free Software Foundation.  Oracle designates this
+* particular file as subject to the "Classpath" exception as provided
+* by Oracle in the LICENSE file that accompanied this code.
+*
+* This code is distributed in the hope that it will be useful, but WITHOUT
+* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+* FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+* version 2 for more details (a copy is included in the LICENSE file that
+* accompanied this code).
+*
+* You should have received a copy of the GNU General Public License version
+* 2 along with this work; if not, write to the Free Software Foundation,
+* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+*
+* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+* or visit www.oracle.com if you need additional information or have any
+* questions.
+*/
+package sun.tools.attach;
+import com.sun.tools.attach.VirtualMachine;
+import com.sun.tools.attach.AgentLoadException;
+import com.sun.tools.attach.AttachNotSupportedException;
+import com.sun.tools.attach.spi.AttachProvider;
+import java.io.InputStream;
+import java.io.IOException;
+import java.io.File;
+import java.util.Properties;
+// Based on 'LinuxVirtualMachine.java'. All occurrences of the string
+// "Linux" have been textually replaced by "Aix" to avoid confusion.
+/*
+* Aix implementation of HotSpotVirtualMachine
+*/
+public class AixVirtualMachine extends HotSpotVirtualMachine {
+// "/tmp" is used as a global well-known location for the files
+// .java_pid<pid>. and .attach_pid<pid>. It is important that this
+// location is the same for all processes, otherwise the tools
+// will not be able to find all Hotspot processes.
+// Any changes to this needs to be synchronized with HotSpot.
+private static final String tmpdir = "/tmp";
+// The patch to the socket file created by the target VM
+String path;
+/**
+* Attaches to the target VM
+*/
+AixVirtualMachine(AttachProvider provider, String vmid)
+throws AttachNotSupportedException, IOException
+{
+super(provider, vmid);
+// This provider only understands pids
+int pid;
+try {
+pid = Integer.parseInt(vmid);
+} catch (NumberFormatException x) {
+throw new AttachNotSupportedException("Invalid process identifier");
+}
+// Find the socket file. If not found then we attempt to start the
+// attach mechanism in the target VM by sending it a QUIT signal.
+// Then we attempt to find the socket file again.
+path = findSocketFile(pid);
+if (path == null) {
+File f = createAttachFile(pid);
+try {
+sendQuitTo(pid);
+// give the target VM time to start the attach mechanism
+int i = 0;
+long delay = 200;
+int retries = (int)(attachTimeout() / delay);
+do {
+try {
+Thread.sleep(delay);
+} catch (InterruptedException x) { }
+path = findSocketFile(pid);
+i++;
+} while (i <= retries && path == null);
+if (path == null) {
+throw new AttachNotSupportedException(
+"Unable to open socket file: target process not responding " +
+"or HotSpot VM not loaded");
+}
+} finally {
+f.delete();
+}
+}
+// Check that the file owner/permission to avoid attaching to
+// bogus process
+checkPermissions(path);
+// Check that we can connect to the process
+// - this ensures we throw the permission denied error now rather than
+// later when we attempt to enqueue a command.
+int s = socket();
+try {
+connect(s, path);
+} finally {
+close(s);
+}
+}
+/**
+* Detach from the target VM
+*/
+public void detach() throws IOException {
+synchronized (this) {
+if (this.path != null) {
+this.path = null;
+}
+}
+}
+// protocol version
+private final static String PROTOCOL_VERSION = "1";
+// known errors
+private final static int ATTACH_ERROR_BADVERSION = 101;
+/**
+* Execute the given command in the target VM.
+*/
+InputStream execute(String cmd, Object ... args) throws AgentLoadException, IOException {
+assert args.length <= 3;            // includes null
+// did we detach?
+String p;
+synchronized (this) {
+if (this.path == null) {
+throw new IOException("Detached from target VM");
+}
+p = this.path;
+}
+// create UNIX socket
+int s = socket();
+// connect to target VM
+try {
+connect(s, p);
+} catch (IOException x) {
+close(s);
+throw x;
+}
+IOException ioe = null;
+// connected - write request
+// <ver> <cmd> <args...>
+try {
+writeString(s, PROTOCOL_VERSION);
+writeString(s, cmd);
+for (int i=0; i<3; i++) {
+if (i < args.length && args[i] != null) {
+writeString(s, (String)args[i]);
+} else {
+writeString(s, "");
+}
+}
+} catch (IOException x) {
+ioe = x;
+}
+// Create an input stream to read reply
+SocketInputStream sis = new SocketInputStream(s);
+// Read the command completion status
+int completionStatus;
+try {
+completionStatus = readInt(sis);
+} catch (IOException x) {
+sis.close();
+if (ioe != null) {
+throw ioe;
+} else {
+throw x;
+}
+}
+if (completionStatus != 0) {
+sis.close();
+// In the event of a protocol mismatch then the target VM
+// returns a known error so that we can throw a reasonable
+// error.
+if (completionStatus == ATTACH_ERROR_BADVERSION) {
+throw new IOException("Protocol mismatch with target VM");
+}
+// Special-case the "load" command so that the right exception is
+// thrown.
+if (cmd.equals("load")) {
+throw new AgentLoadException("Failed to load agent library");
+} else {
+throw new IOException("Command failed in target VM");
+}
+}
+// Return the input stream so that the command output can be read
+return sis;
+}
+/*
+* InputStream for the socket connection to get target VM
+*/
+private class SocketInputStream extends InputStream {
+int s;
+public SocketInputStream(int s) {
+this.s = s;
+}
+public synchronized int read() throws IOException {
+byte b[] = new byte[1];
+int n = this.read(b, 0, 1);
+if (n == 1) {
+return b[0] & 0xff;
+} else {
+return -1;
+}
+}
+public synchronized int read(byte[] bs, int off, int len) throws IOException {
+if ((off < 0) || (off > bs.length) || (len < 0) ||
+((off + len) > bs.length) || ((off + len) < 0)) {
+throw new IndexOutOfBoundsException();
+} else if (len == 0)
+return 0;
+return AixVirtualMachine.read(s, bs, off, len);
+}
+public void close() throws IOException {
+AixVirtualMachine.close(s);
+}
+}
+// Return the socket file for the given process.
+private String findSocketFile(int pid) {
+File f = new File(tmpdir, ".java_pid" + pid);
+if (!f.exists()) {
+return null;
+}
+return f.getPath();
+}
+// On Solaris/Linux/Aix a simple handshake is used to start the attach mechanism
+// if not already started. The client creates a .attach_pid<pid> file in the
+// target VM's working directory (or temp directory), and the SIGQUIT handler
+// checks for the file.
+private File createAttachFile(int pid) throws IOException {
+String fn = ".attach_pid" + pid;
+String path = "/proc/" + pid + "/cwd/" + fn;
+File f = new File(path);
+try {
+f.createNewFile();
+} catch (IOException x) {
+f = new File(tmpdir, fn);
+f.createNewFile();
+}
+return f;
+}
+/*
+* Write/sends the given to the target VM. String is transmitted in
+* UTF-8 encoding.
+*/
+private void writeString(int fd, String s) throws IOException {
+if (s.length() > 0) {
+byte b[];
+try {
+b = s.getBytes("UTF-8");
+} catch (java.io.UnsupportedEncodingException x) {
+throw new InternalError(x);
+}
+AixVirtualMachine.write(fd, b, 0, b.length);
+}
+byte b[] = new byte[1];
+b[0] = 0;
+write(fd, b, 0, 1);
+}
+//-- native methods
+static native void sendQuitTo(int pid) throws IOException;
+static native void checkPermissions(String path) throws IOException;
+static native int socket() throws IOException;
+static native void connect(int fd, String path) throws IOException;
+static native void close(int fd) throws IOException;
+static native int read(int fd, byte buf[], int off, int bufLen) throws IOException;
+static native void write(int fd, byte buf[], int off, int bufLen) throws IOException;
+static {
+System.loadLibrary("attach");
+}
+}