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

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

Source:LinuxVirtualMachine.java

...50      int pid = Integer.parseInt(vmid);51      // Find the socket file. If not found then we attempt to start the52      // 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      }...

findSocketFile

Using AI Code Generation

1import java.io.*;2import java.lang.reflect.*;3import com.sun.tools.attach.*;4public class FindSocketFile {5    public static void main(String[] args) throws Exception {6        if (args.length != 1) {7            System.err.println("Usage: java FindSocketFile <pid>");8            System.exit(1);9        }10        int pid = Integer.parseInt(args[0]);11        String socketFile = findSocketFile(pid);12        System.out.println("Socket file for pid " + pid + " is " + socketFile);13    }14    public static String findSocketFile(int pid) throws Exception {15        String socketFile = null;16        VirtualMachine vm = null;17        try {18            vm = VirtualMachine.attach(String.valueOf(pid));19            Method findSocketFile = vm.getClass().getDeclaredMethod("findSocketFile");20            findSocketFile.setAccessible(true);21            socketFile = (String)findSocketFile.invoke(vm);22        } finally {23            if (vm != null) {24                vm.detach();25            }26        }27        return socketFile;28    }29}

findSocketFile

Using AI Code Generation

1import sun.tools.attach.LinuxVirtualMachine;2import sun.tools.attach.*;3import java.io.*;4import java.lang.management.*;5import java.util.*;6public class jcmd {7    public static void main(String[] args) throws Exception {8        if (args.length != 2) {9            System.err.println("Usage: jcmd <pid> <command>");10            System.exit(1);11        }12        String pid = args[0];13        String command = args[1];14        String socketFile = LinuxVirtualMachine.findSocketFile(pid);15        if (socketFile == null) {16            System.err.println("Can't find socket file for pid " + pid);17            System.exit(1);18        }19        try (VirtualMachine vm = VirtualMachine.attach(pid)) {20            InputStream in = vm.executeCommand("jcmd", command);21            BufferedReader reader = new BufferedReader(new InputStreamReader(in));22            String line;23            while ((line = reader.readLine()) != null) {24                System.out.println(line);25            }26        }27    }28}29import sun.tools.attach.LinuxVirtualMachine;30import sun.tools.attach.*;31import java.io.*;32import java.lang.management.*;33import java.util.*;34public class jcmd {35    public static void main(String[] args) throws Exception {36        if (args.length != 2) {37            System.err.println("Usage: jcmd <pid> <command>");38            System.exit(1);39        }40        String pid = args[0];41        String command = args[1];42        String socketFile = LinuxVirtualMachine.findSocketFile(pid);43        if (socketFile == null) {44            System.err.println("Can't find socket file for pid " + pid);45            System.exit(1);46        }47        try (VirtualMachine vm = VirtualMachine.attach(pid)) {48            InputStream in = vm.executeCommand("jcmd", command);49            BufferedReader reader = new BufferedReader(new InputStreamReader(in));50            String line;51            while ((line = reader.readLine()) != null) {52                System.out.println(line);53            }54        }55    }56}

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