--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.attach/solaris/classes/sun/tools/attach/VirtualMachineImpl.java Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,263 @@
+/*
+ * Copyright (c) 2005, 2014, Oracle and/or its affiliates. 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.AttachOperationFailedException;
+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.io.FileNotFoundException;
+
+/*
+ * Solaris implementation of HotSpotVirtualMachine.
+ */
+public class VirtualMachineImpl 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";
+
+ // door descriptor;
+ private int fd = -1;
+
+ /**
+ * Attaches to the target VM
+ */
+ VirtualMachineImpl(AttachProvider provider, String vmid)
+ throws AttachNotSupportedException, IOException
+ {
+ super(provider, vmid);
+ // This provider only understands process-ids (pids).
+ int pid;
+ try {
+ pid = Integer.parseInt(vmid);
+ } catch (NumberFormatException x) {
+ throw new AttachNotSupportedException("invalid process identifier");
+ }
+
+ // Opens the door file to the target VM. If the file is not
+ // found it might mean that the attach mechanism isn't started in the
+ // target VM so we attempt to start it and retry.
+ try {
+ fd = openDoor(pid);
+ } catch (FileNotFoundException fnf1) {
+ File f = createAttachFile(pid);
+ try {
+ sigquit(pid);
+
+ // give the target VM time to start the attach mechanism
+ final int delay_step = 100;
+ final long timeout = attachTimeout();
+ long time_spend = 0;
+ long delay = 0;
+ do {
+ // Increase timeout on each attempt to reduce polling
+ delay += delay_step;
+ try {
+ Thread.sleep(delay);
+ } catch (InterruptedException x) { }
+ try {
+ fd = openDoor(pid);
+ } catch (FileNotFoundException fnf2) {
+ // pass
+ }
+
+ time_spend += delay;
+ if (time_spend > timeout/2 && fd == -1) {
+ // Send QUIT again to give target VM the last chance to react
+ sigquit(pid);
+ }
+ } while (time_spend <= timeout && fd == -1);
+ if (fd == -1) {
+ throw new AttachNotSupportedException(
+ String.format("Unable to open door %s: " +
+ "target process %d doesn't respond within %dms " +
+ "or HotSpot VM not loaded", f.getPath(), pid, time_spend));
+ }
+ } finally {
+ f.delete();
+ }
+ }
+ assert fd >= 0;
+ }
+
+ /**
+ * Detach from the target VM
+ */
+ public void detach() throws IOException {
+ synchronized (this) {
+ if (fd != -1) {
+ close(fd);
+ fd = -1;
+ }
+ }
+ }
+
+ /**
+ * Execute the given command in the target VM.
+ */
+ InputStream execute(String cmd, Object ... args) throws AgentLoadException, IOException {
+ assert args.length <= 3; // includes null
+
+ // first check that we are still attached
+ int door;
+ synchronized (this) {
+ if (fd == -1) {
+ throw new IOException("Detached from target VM");
+ }
+ door = fd;
+ }
+
+ // enqueue the command via a door call
+ int s = enqueue(door, cmd, args);
+ assert s >= 0; // valid file descriptor
+
+ // The door call returns a file descriptor (one end of a socket pair).
+ // Create an input stream around it.
+ SocketInputStream sis = new SocketInputStream(s);
+
+ // Read the command completion status
+ int completionStatus;
+ try {
+ completionStatus = readInt(sis);
+ } catch (IOException ioe) {
+ sis.close();
+ throw ioe;
+ }
+
+ // If non-0 it means an error but we need to special-case the
+ // "load" command to ensure that the right exception is thrown.
+ if (completionStatus != 0) {
+ // read from the stream and use that as the error message
+ String message = readErrorMessage(sis);
+ sis.close();
+ if (cmd.equals("load")) {
+ String msg = "Failed to load agent library";
+ if (!message.isEmpty())
+ msg += ": " + message;
+ throw new AgentLoadException(msg);
+ } else {
+ if (message.isEmpty())
+ message = "Command failed in target VM";
+ throw new AttachOperationFailedException(message);
+ }
+ }
+
+ // Return the input stream so that the command output can be read
+ return sis;
+ }
+
+ // InputStream over a socket
+ 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 VirtualMachineImpl.read(s, bs, off, len);
+ }
+
+ public void close() throws IOException {
+ VirtualMachineImpl.close(s);
+ }
+ }
+
+ // The door is attached to .java_pid<pid> in the temporary directory.
+ private int openDoor(int pid) throws IOException {
+ String path = tmpdir + "/.java_pid" + pid;;
+ fd = open(path);
+
+ // Check that the file owner/permission to avoid attaching to
+ // bogus process
+ try {
+ checkPermissions(path);
+ } catch (IOException ioe) {
+ close(fd);
+ throw ioe;
+ }
+ return fd;
+ }
+
+ // On Solaris/Linux 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 temporary 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;
+ }
+
+ //-- native methods
+
+ static native int open(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 checkPermissions(String path) throws IOException;
+
+ static native void sigquit(int pid) throws IOException;
+
+ // enqueue a command (and arguments) to the given door
+ static native int enqueue(int fd, String cmd, Object ... args)
+ throws IOException;
+
+ static {
+ System.loadLibrary("attach");
+ }
+}