diff options
Diffstat (limited to 'kamon-autoweave/src/main/java/sun/tools')
5 files changed, 1367 insertions, 0 deletions
diff --git a/kamon-autoweave/src/main/java/sun/tools/attach/BsdVirtualMachine.java b/kamon-autoweave/src/main/java/sun/tools/attach/BsdVirtualMachine.java new file mode 100644 index 00000000..1f134de6 --- /dev/null +++ b/kamon-autoweave/src/main/java/sun/tools/attach/BsdVirtualMachine.java @@ -0,0 +1,303 @@ +/* + * Copyright (c) 2005, 2012, 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.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; + +/* + * Bsd implementation of HotSpotVirtualMachine + */ +public class BsdVirtualMachine extends HotSpotVirtualMachine { + // "tmpdir" 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. + // This is intentionally not the same as java.io.tmpdir, since + // the latter can be changed by the user. + // Any changes to this needs to be synchronized with HotSpot. + private static final String tmpdir; + + // The patch to the socket file created by the target VM + String path; + + /** + * Attaches to the target VM + */ + public BsdVirtualMachine(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 = new File(tmpdir, ".attach_pid" + pid); + createAttachFile(f.getPath()); + 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 BsdVirtualMachine.read(s, bs, off, len); + } + + public void close() throws IOException { + BsdVirtualMachine.close(s); + } + } + + // Return the socket file for the given process. + // Checks temp directory for .java_pid<pid>. + private String findSocketFile(int pid) { + String fn = ".java_pid" + pid; + File f = new File(tmpdir, fn); + return f.exists() ? f.getPath() : null; + } + + /* + * 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(); + } + BsdVirtualMachine.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 native void createAttachFile(String path); + + static native String getTempDir(); + + static { + System.loadLibrary("attach"); + tmpdir = getTempDir(); + } +} diff --git a/kamon-autoweave/src/main/java/sun/tools/attach/HotSpotVirtualMachine.java b/kamon-autoweave/src/main/java/sun/tools/attach/HotSpotVirtualMachine.java new file mode 100644 index 00000000..0bc04b04 --- /dev/null +++ b/kamon-autoweave/src/main/java/sun/tools/attach/HotSpotVirtualMachine.java @@ -0,0 +1,289 @@ +/* + * Copyright (c) 2005, 2011, 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.VirtualMachine; +import com.sun.tools.attach.AgentLoadException; +import com.sun.tools.attach.AgentInitializationException; +import com.sun.tools.attach.spi.AttachProvider; + +import java.io.InputStream; +import java.io.IOException; +import java.util.Properties; +import java.util.Map; + +/* + * The HotSpot implementation of com.sun.tools.attach.VirtualMachine. + */ + +public abstract class HotSpotVirtualMachine extends VirtualMachine { + + HotSpotVirtualMachine(AttachProvider provider, String id) { + super(provider, id); + } + + /* + * Load agent library + * If isAbsolute is true then the agent library is the absolute path + * to the library and thus will not be expanded in the target VM. + * if isAbsolute is false then the agent library is just a library + * name and it will be expended in the target VM. + */ + private void loadAgentLibrary(String agentLibrary, boolean isAbsolute, String options) + throws AgentLoadException, AgentInitializationException, IOException + { + InputStream in = execute("load", + agentLibrary, + isAbsolute ? "true" : "false", + options); + try { + int result = readInt(in); + if (result != 0) { + throw new AgentInitializationException("Agent_OnAttach failed", result); + } + } finally { + in.close(); + + } + } + + /* + * Load agent library - library name will be expanded in target VM + */ + public void loadAgentLibrary(String agentLibrary, String options) + throws AgentLoadException, AgentInitializationException, IOException + { + loadAgentLibrary(agentLibrary, false, options); + } + + /* + * Load agent - absolute path of library provided to target VM + */ + public void loadAgentPath(String agentLibrary, String options) + throws AgentLoadException, AgentInitializationException, IOException + { + loadAgentLibrary(agentLibrary, true, options); + } + + /* + * Load JPLIS agent which will load the agent JAR file and invoke + * the agentmain method. + */ + public void loadAgent(String agent, String options) + throws AgentLoadException, AgentInitializationException, IOException + { + String args = agent; + if (options != null) { + args = args + "=" + options; + } + try { + loadAgentLibrary("instrument", args); + } catch (AgentLoadException x) { + throw new InternalError("instrument library is missing in target VM"); + } catch (AgentInitializationException x) { + /* + * Translate interesting errors into the right exception and + * message (FIXME: create a better interface to the instrument + * implementation so this isn't necessary) + */ + int rc = x.returnValue(); + switch (rc) { + case JNI_ENOMEM: + throw new AgentLoadException("Insuffient memory"); + case ATTACH_ERROR_BADJAR: + throw new AgentLoadException("Agent JAR not found or no Agent-Class attribute"); + case ATTACH_ERROR_NOTONCP: + throw new AgentLoadException("Unable to add JAR file to system class path"); + case ATTACH_ERROR_STARTFAIL: + throw new AgentInitializationException("Agent JAR loaded but agent failed to initialize"); + default : + throw new AgentLoadException("Failed to load agent - unknown reason: " + rc); + } + } + } + + /* + * The possible errors returned by JPLIS's agentmain + */ + private static final int JNI_ENOMEM = -4; + private static final int ATTACH_ERROR_BADJAR = 100; + private static final int ATTACH_ERROR_NOTONCP = 101; + private static final int ATTACH_ERROR_STARTFAIL = 102; + + + /* + * Send "properties" command to target VM + */ + public Properties getSystemProperties() throws IOException { + InputStream in = null; + Properties props = new Properties(); + try { + in = executeCommand("properties"); + props.load(in); + } finally { + if (in != null) in.close(); + } + return props; + } + + public Properties getAgentProperties() throws IOException { + InputStream in = null; + Properties props = new Properties(); + try { + in = executeCommand("agentProperties"); + props.load(in); + } finally { + if (in != null) in.close(); + } + return props; + } + + // --- HotSpot specific methods --- + + // same as SIGQUIT + public void localDataDump() throws IOException { + executeCommand("datadump").close(); + } + + // Remote ctrl-break. The output of the ctrl-break actions can + // be read from the input stream. + public InputStream remoteDataDump(Object ... args) throws IOException { + return executeCommand("threaddump", args); + } + + // Remote heap dump. The output (error message) can be read from the + // returned input stream. + public InputStream dumpHeap(Object ... args) throws IOException { + return executeCommand("dumpheap", args); + } + + // Heap histogram (heap inspection in HotSpot) + public InputStream heapHisto(Object ... args) throws IOException { + return executeCommand("inspectheap", args); + } + + // set JVM command line flag + public InputStream setFlag(String name, String value) throws IOException { + return executeCommand("setflag", name, value); + } + + // print command line flag + public InputStream printFlag(String name) throws IOException { + return executeCommand("printflag", name); + } + + public InputStream executeJCmd(String command) throws IOException { + return executeCommand("jcmd", command); + } + + // -- Supporting methods + + + /* + * Execute the given command in the target VM - specific platform + * implementation must implement this. + */ + abstract InputStream execute(String cmd, Object ... args) + throws AgentLoadException, IOException; + + /* + * Convenience method for simple commands + */ + private InputStream executeCommand(String cmd, Object ... args) throws IOException { + try { + return execute(cmd, args); + } catch (AgentLoadException x) { + throw new InternalError("Should not get here"); + } + } + + + /* + * Utility method to read an 'int' from the input stream. Ideally + * we should be using java.util.Scanner here but this implementation + * guarantees not to read ahead. + */ + int readInt(InputStream in) throws IOException { + StringBuilder sb = new StringBuilder(); + + // read to \n or EOF + int n; + byte buf[] = new byte[1]; + do { + n = in.read(buf, 0, 1); + if (n > 0) { + char c = (char)buf[0]; + if (c == '\n') { + break; // EOL found + } else { + sb.append(c); + } + } + } while (n > 0); + + if (sb.length() == 0) { + throw new IOException("Premature EOF"); + } + + int value; + try { + value = Integer.parseInt(sb.toString()); + } catch (NumberFormatException x) { + throw new IOException("Non-numeric value found - int expected"); + } + return value; + } + + // -- attach timeout support + + private static long defaultAttachTimeout = 5000; + private volatile long attachTimeout; + + /* + * Return attach timeout based on the value of the sun.tools.attach.attachTimeout + * property, or the default timeout if the property is not set to a positive + * value. + */ + long attachTimeout() { + if (attachTimeout == 0) { + synchronized(this) { + if (attachTimeout == 0) { + try { + String s = + System.getProperty("sun.tools.attach.attachTimeout"); + attachTimeout = Long.parseLong(s); + } catch (SecurityException se) { + } catch (NumberFormatException ne) { + } + if (attachTimeout <= 0) { + attachTimeout = defaultAttachTimeout; + } + } + } + } + return attachTimeout; + } +} diff --git a/kamon-autoweave/src/main/java/sun/tools/attach/LinuxVirtualMachine.java b/kamon-autoweave/src/main/java/sun/tools/attach/LinuxVirtualMachine.java new file mode 100644 index 00000000..97298ee1 --- /dev/null +++ b/kamon-autoweave/src/main/java/sun/tools/attach/LinuxVirtualMachine.java @@ -0,0 +1,339 @@ +/* + * Copyright (c) 2005, 2010, 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.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; + +/* + * Linux implementation of HotSpotVirtualMachine + */ +public class LinuxVirtualMachine 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"; + + // Indicates if this machine uses the old LinuxThreads + static boolean isLinuxThreads; + + // The patch to the socket file created by the target VM + String path; + + /** + * Attaches to the target VM + */ + public LinuxVirtualMachine(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 { + // On LinuxThreads each thread is a process and we don't have the + // pid of the VMThread which has SIGQUIT unblocked. To workaround + // this we get the pid of the "manager thread" that is created + // by the first call to pthread_create. This is parent of all + // threads (except the initial thread). + if (isLinuxThreads) { + int mpid; + try { + mpid = getLinuxThreadsManager(pid); + } catch (IOException x) { + throw new AttachNotSupportedException(x.getMessage()); + } + assert(mpid >= 1); + sendQuitToChildrenOf(mpid); + } else { + 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 LinuxVirtualMachine.read(s, bs, off, len); + } + + public void close() throws IOException { + LinuxVirtualMachine.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 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(); + } + LinuxVirtualMachine.write(fd, b, 0, b.length); + } + byte b[] = new byte[1]; + b[0] = 0; + write(fd, b, 0, 1); + } + + + //-- native methods + + static native boolean isLinuxThreads(); + + static native int getLinuxThreadsManager(int pid) throws IOException; + + static native void sendQuitToChildrenOf(int pid) throws IOException; + + 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"); + isLinuxThreads = isLinuxThreads(); + } +} diff --git a/kamon-autoweave/src/main/java/sun/tools/attach/SolarisVirtualMachine.java b/kamon-autoweave/src/main/java/sun/tools/attach/SolarisVirtualMachine.java new file mode 100644 index 00000000..388c89c4 --- /dev/null +++ b/kamon-autoweave/src/main/java/sun/tools/attach/SolarisVirtualMachine.java @@ -0,0 +1,247 @@ +/* + * Copyright (c) 2005, 2010, 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.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.io.FileNotFoundException; +import java.util.Properties; + +/* + * Solaris implementation of HotSpotVirtualMachine. + */ +public class SolarisVirtualMachine 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 + */ + public SolarisVirtualMachine(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 { + // kill -QUIT will tickle target VM to check for the + // attach file. + sigquit(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) { } + try { + fd = openDoor(pid); + } catch (FileNotFoundException fnf2) { } + i++; + } while (i <= retries && fd == -1); + if (fd == -1) { + throw new AttachNotSupportedException( + "Unable to open door: target process not responding or " + + "HotSpot VM not loaded"); + } + } 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) { + sis.close(); + 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 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 SolarisVirtualMachine.read(s, bs, off, len); + } + + public void close() throws IOException { + SolarisVirtualMachine.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"); + } +} diff --git a/kamon-autoweave/src/main/java/sun/tools/attach/WindowsVirtualMachine.java b/kamon-autoweave/src/main/java/sun/tools/attach/WindowsVirtualMachine.java new file mode 100644 index 00000000..260d02b7 --- /dev/null +++ b/kamon-autoweave/src/main/java/sun/tools/attach/WindowsVirtualMachine.java @@ -0,0 +1,189 @@ +/* + * Copyright (c) 2005, 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.VirtualMachine; +import com.sun.tools.attach.AgentLoadException; +import com.sun.tools.attach.AttachNotSupportedException; +import com.sun.tools.attach.spi.AttachProvider; +import sun.tools.attach.HotSpotVirtualMachine; +import java.io.IOException; +import java.io.File; +import java.io.InputStream; +import java.util.Properties; +import java.util.Random; + +public class WindowsVirtualMachine extends HotSpotVirtualMachine { + + // the enqueue code stub (copied into each target VM) + private static byte[] stub; + + private volatile long hProcess; // handle to the process + + public WindowsVirtualMachine(AttachProvider provider, String id) + throws AttachNotSupportedException, IOException + { + super(provider, id); + + int pid; + try { + pid = Integer.parseInt(id); + } catch (NumberFormatException x) { + throw new AttachNotSupportedException("Invalid process identifier"); + } + hProcess = openProcess(pid); + + // The target VM might be a pre-6.0 VM so we enqueue a "null" command + // which minimally tests that the enqueue function exists in the target + // VM. + try { + enqueue(hProcess, stub, null, null); + } catch (IOException x) { + throw new AttachNotSupportedException(x.getMessage()); + } + } + + public void detach() throws IOException { + synchronized (this) { + if (hProcess != -1) { + closeProcess(hProcess); + hProcess = -1; + } + } + } + + InputStream execute(String cmd, Object ... args) + throws AgentLoadException, IOException + { + assert args.length <= 3; // includes null + + // create a pipe using a random name + int r = (new Random()).nextInt(); + String pipename = "\\\\.\\pipe\\javatool" + r; + long hPipe = createPipe(pipename); + + // check if we are detached - in theory it's possible that detach is invoked + // after this check but before we enqueue the command. + if (hProcess == -1) { + closePipe(hPipe); + throw new IOException("Detached from target VM"); + } + + try { + // enqueue the command to the process + enqueue(hProcess, stub, cmd, pipename, args); + + // wait for command to complete - process will connect with the + // completion status + connectPipe(hPipe); + + // create an input stream for the pipe + PipedInputStream is = new PipedInputStream(hPipe); + + // read completion status + int status = readInt(is); + if (status != 0) { + // 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 + return is; + + } catch (IOException ioe) { + closePipe(hPipe); + throw ioe; + } + } + + // An InputStream based on a pipe to the target VM + private class PipedInputStream extends InputStream { + + private long hPipe; + + public PipedInputStream(long hPipe) { + this.hPipe = hPipe; + } + + 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 WindowsVirtualMachine.readPipe(hPipe, bs, off, len); + } + + public void close() throws IOException { + if (hPipe != -1) { + WindowsVirtualMachine.closePipe(hPipe); + hPipe = -1; + } + } + } + + + //-- native methods + + static native void init(); + + static native byte[] generateStub(); + + static native long openProcess(int pid) throws IOException; + + static native void closeProcess(long hProcess) throws IOException; + + static native long createPipe(String name) throws IOException; + + static native void closePipe(long hPipe) throws IOException; + + static native void connectPipe(long hPipe) throws IOException; + + static native int readPipe(long hPipe, byte buf[], int off, int buflen) throws IOException; + + static native void enqueue(long hProcess, byte[] stub, + String cmd, String pipename, Object ... args) throws IOException; + + static { + System.loadLibrary("attach"); + init(); // native initialization + stub = generateStub(); // generate stub to copy into target process + } +} |