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How to use createAttachFile method of sun.tools.attach.LinuxVirtualMachine class

Best Powermock code snippet using sun.tools.attach.LinuxVirtualMachine.createAttachFile

Source:LinuxVirtualMachine.java

...52      // attach mechanism in the target VM by sending it a QUIT signal.53      // Then we attempt to find the socket file again.54      path = findSocketFile(pid);55      if (path == null) {56         File f = createAttachFile(pid);57         try {58            // On LinuxThreads each thread is a process and we don't have the59            // pid of the VMThread which has SIGQUIT unblocked. To workaround60            // this we get the pid of the "manager thread" that is created61            // by the first call to pthread_create. This is parent of all62            // threads (except the initial thread).63            if (isLinuxThreads) {64               int mpid = getLinuxThreadsManager(pid);65               assert mpid >= 1;66               sendQuitToChildrenOf(mpid);67            }68            else {69               sendQuitTo(pid);70            }71            // give the target VM time to start the attach mechanism72            int i = 0;73            long delay = 200;74            int retries = (int) (attachTimeout() / delay);75            do {76               try {77                  Thread.sleep(delay);78               }79               catch (InterruptedException ignore) { }80               path = findSocketFile(pid);81               i++;82            }83            while (i <= retries && path == null);84            if (path == null) {85               throw new AttachNotSupportedException(86                  "Unable to open socket file: target process not responding " +87                  "or HotSpot VM not loaded");88            }89         }90         finally {91            f.delete();92         }93      }94      // Check that the file owner/permission to avoid attaching to95      // bogus process96      checkPermissions(path);97      // Check that we can connect to the process98      // - this ensures we throw the permission denied error now rather than99      // later when we attempt to enqueue a command.100      int s = socket();101      try {102         connect(s, path);103      }104      finally {105         close(s);106      }107   }108   /**109    * Detach from the target VM.110    */111   @Override112   public void detach()113   {114      synchronized (this) {115         if (path != null) {116            path = null;117         }118      }119   }120   // protocol version121   private static final String PROTOCOL_VERSION = "1";122   // known errors123   private static final int ATTACH_ERROR_BADVERSION = 101;124   /**125    * Execute the given command in the target VM.126    */127   @Override128   InputStream execute(String cmd, Object... args) throws AgentLoadException, IOException129   {130      assert args.length <= 3;                // includes null131      // did we detach?132      String p;133      synchronized (this) {134         if (path == null) {135            throw new IOException("Detached from target VM");136         }137         p = path;138      }139      // create UNIX socket140      int s = socket();141      // connect to target VM142      try {143         connect(s, p);144      }145      catch (IOException x) {146         close(s);147         throw x;148      }149      IOException ioe = null;150      // connected - write request151      // <ver> <cmd> <args...>152      try {153         writeString(s, PROTOCOL_VERSION);154         writeString(s, cmd);155         for (int i = 0; i < 3; i++) {156            if (i < args.length && args[i] != null) {157               writeString(s, (String) args[i]);158            }159            else {160               writeString(s, "");161            }162         }163      }164      catch (IOException x) {165         ioe = x;166      }167      // Create an input stream to read reply.168      SocketInputStream sis = new SocketInputStream(s);169      // Read the command completion status.170      int completionStatus;171      try {172         completionStatus = readInt(sis);173      }174      catch (IOException x) {175         sis.close();176         if (ioe != null) {177            throw ioe;178         }179         else {180            throw x;181         }182      }183      if (completionStatus != 0) {184         sis.close();185         // In the event of a protocol mismatch then the target VM186         // returns a known error so that we can throw a reasonable error.187         if (completionStatus == ATTACH_ERROR_BADVERSION) {188            throw new IOException("Protocol mismatch with target VM");189         }190         // Special-case the "load" command so that the right exception is thrown.191         if ("load".equals(cmd)) {192            throw new AgentLoadException("Failed to load agent library");193         }194         else {195            throw new IOException("Command failed in target VM");196         }197      }198      // Return the input stream so that the command output can be read.199      return sis;200   }201   /**202    * InputStream for the socket connection to get target VM.203    */204   private final class SocketInputStream extends InputStream205   {206      int s;207      SocketInputStream(int s)208      {209         this.s = s;210      }211      @Override212      public synchronized int read() throws IOException213      {214         byte[] b = new byte[1];215         int n = read(b, 0, 1);216         if (n == 1) {217            return b[0] & 0xff;218         }219         else {220            return -1;221         }222      }223      @Override224      public synchronized int read(byte[] bs, int off, int len) throws IOException225      {226         if (off < 0 || off > bs.length || len < 0 || off + len > bs.length || off + len < 0) {227            throw new IndexOutOfBoundsException();228         }229         else if (len == 0) {230            return 0;231         }232         return LinuxVirtualMachine.read(s, bs, off, len);233      }234      @Override235      public void close() throws IOException236      {237         LinuxVirtualMachine.close(s);238      }239   }240   // Return the socket file for the given process.241   // Checks working directory of process for .java_pid<pid>. If not242   // found it looks in /tmp.243   private String findSocketFile(int pid)244   {245      // First check for a .java_pid<pid> file in the working directory246      // of the target process247      String fn = ".java_pid" + pid;248      String path = "/proc/" + pid + "/cwd/" + fn;249      File f = new File(path);250      if (!f.exists()) {251         // Not found, so try /tmp252         path = "/tmp/" + fn;253         f = new File(path);254         if (!f.exists()) {255            return null;            // not found256         }257      }258      return path;259   }260   // On Solaris/Linux a simple handshake is used to start the attach mechanism261   // if not already started. The client creates a .attach_pid<pid> file in the262   // target VM's working directory (or /tmp), and the SIGQUIT handler checks263   // for the file.264   private File createAttachFile(int pid) throws IOException265   {266      String fn = ".attach_pid" + pid;267      String path = "/proc/" + pid + "/cwd/" + fn;268      File f = new File(path);269      try {270         f.createNewFile();271      }272      catch (IOException ignore) {273         path = "/tmp/" + fn;274         f = new File(path);275         f.createNewFile();276      }277      return f;278   }...

createAttachFile

Using AI Code Generation

1import java.io.File;2import java.io.IOException;3import java.lang.management.ManagementFactory;4import java.lang.management.RuntimeMXBean;5import java.lang.reflect.Method;6import java.util.List;7public class AttachFileTest {8    public static void main(String[] args) throws Exception {9        RuntimeMXBean runtimeMXBean = ManagementFactory.getRuntimeMXBean();10        String name = runtimeMXBean.getName();11        int index = name.indexOf('@');12        String pid = name.substring(0, index);13        String attachFile = getAttachFile(pid);14        System.out.println("attach file: " + attachFile);15        createAttachFile(attachFile);16    }17    private static String getAttachFile(String pid) throws IOException {18        String path = "/tmp";19        if (System.getProperty("os.name").toLowerCase().contains("windows")) {20            path = System.getenv("TEMP");21        }22        return path + File.separator + ".java_pid" + pid;23    }24    private static void createAttachFile(String attachFile) throws Exception {25        Class<?> clazz = Class.forName("sun.tools.attach.LinuxVirtualMachine");26        Method method = clazz.getDeclaredMethod("createAttachFile", String.class);27        method.setAccessible(true);28        method.invoke(null, attachFile);29    }30}31ProcessHandle currentProcess = ProcessHandle.current();32long pid = currentProcess.pid();33ProcessHandle currentProcess = ProcessHandle.current();34long pid = currentProcess.pid();35ProcessHandle currentProcess = ProcessHandle.current();36long pid = currentProcess.pid();

createAttachFile

Using AI Code Generation

1import sun.tools.attach.LinuxVirtualMachine;2import java.io.File;3import java.io.FileWriter;4import java.io.IOException;5import java.io.PrintWriter;6import java.io.BufferedReader;7import java.io.InputStreamReader;8import java.io.InputStream;9import java.io.FileInputStream;10import java.io.FileOutputStream;11import java.io.OutputStream;12import java.io.BufferedOutputStream;13import java.util.Arrays;14import java.util.List;15import java.util.ArrayList;16import java.util.Map;17import java.util.HashMap;18import java.util.Set;19import java.util.HashSet;20import java.util.Iterator;21import java.util.regex.Pattern;22import java.util.regex.Matcher;23import java.util.Date;24import java.text.SimpleDateFormat;25import java.util.TimeZone;26import java.util.concurrent.TimeUnit;27import java.util.concurrent.TimeoutException;28import java.util.concurrent.Executors;29import java.util.concurrent.ExecutorService;30import java.util.concurrent.Callable;31import java.util.concurrent.Future;32class ExecuteCommand implements Callable<String> {33    String command = "";34    String output = "";35    Process process = null;36    BufferedReader reader = null;37    InputStream in = null;38    String line = "";39    StringBuilder sb = new StringBuilder();40    public ExecuteCommand(String command) {41        this.command = command;42    }43    public String call() throws Exception {44        try {45            process = Runtime.getRuntime().exec(command);46            in = process.getInputStream();47            reader = new BufferedReader(new InputStreamReader(in));48            while ((line = reader.readLine()) != null) {49                sb.append(line);50                sb.append("51");52            }53            output = sb.toString();54        } catch (IOException e) {55            System.out.println("Exception: " + e);56        } finally {57            if (reader != null) {58                try {59                    reader.close();60                } catch (IOException e) {61                    System.out.println("Exception: " + e);62                }63            }64            if (in != null) {65                try {66                    in.close();67                } catch (IOException e) {68                    System.out.println("Exception: " + e);69                }70            }71            if (process != null) {72                try {73                    process.destroy();74                } catch (Exception e) {75                    System.out.println("Exception: " + e);76                }77            }78        }79        return output;80    }81}82class ExecuteCommandWithTimeout implements Callable<String> {83    String command = "";

createAttachFile

Using AI Code Generation

1import sun.tools.attach.LinuxVirtualMachine;2import java.io.File;3public class TestCreateAttachFile {4    public static void main(String[] args) {5        try {6            String pid = args[0];7            String fileName = args[1];8            LinuxVirtualMachine vm = (LinuxVirtualMachine) LinuxVirtualMachine.attach(pid);9            vm.createAttachFile(new File(fileName));10            vm.detach();11        } catch (Exception e) {12            e.printStackTrace();13        }14    }15}

createAttachFile

Using AI Code Generation

1import java.io.*;2import java.lang.management.ManagementFactory;3import java.lang.management.ThreadInfo;4import java.lang.management.ThreadMXBean;5import java.lang.reflect.Method;6import java.util.ArrayList;7import java.util.List;8import java.util.Properties;9import java.util.concurrent.TimeUnit;10public class Attach {11    public static void main(String[] args) throws Exception {12        String pid = getPid();13        String name = getProcessName(pid);14        getHeapDump(pid, name);15        getThreadDump(pid, name);16        getCpuUsage(pid);17        getMemoryUsage(pid);18    }19    public static String getPid() throws IOException {20        String pid = ManagementFactory.getRuntimeMXBean().getName().split("@")[0];21        System.out.println("pid of this java process is: " + pid);22        return pid;23    }24    public static String getProcessName(String pid) throws IOException {25        String name = "";26        Process process = Runtime.getRuntime().exec("ps -p " + pid + " -o comm=");27        BufferedReader br = new BufferedReader(new InputStreamReader(process.getInputStream()));28        String line;29        while ((line = br.readLine()) != null) {30            name = line;31        }32        System.out.println("name of this java process is: " + name);33        return name;34    }35    public static void getHeapDump(String pid, String name) throws Exception {36        Class<?> c = Class.forName("sun.tools.attach.LinuxVirtualMachine");37        Method attach = c.getDeclaredMethod("attach", String.class);38        Object vm = attach.invoke(null, pid);39        Method getHeapHump = c.getDeclaredMethod("getHeapHump", String.class);40        String heapDumpFile = name + ".hprof";41        getHeapHump.invoke(vm, heapDumpFile);42        System.out.println("heap dump file of this java process is: " + heapDumpFile);43    }

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