src/windows/native/sun/tools/attach/WindowsVirtualMachine.c

*** 1,7 ****
  /*
!  * Copyright (c) 2005, 2006, 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
--- 1,7 ----
  /*
!  * 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
*** 171,199 ****
   * Signature: (I)J
   */
  JNIEXPORT jlong JNICALL Java_sun_tools_attach_WindowsVirtualMachine_openProcess
    (JNIEnv *env, jclass cls, jint pid)
  {
!     HANDLE hProcess;
  
      /*
       * Attempt to open process. If it fails then we try to enable the
       * SE_DEBUG_NAME privilege and retry.
       */
      hProcess = OpenProcess(PROCESS_ALL_ACCESS, FALSE, (DWORD)pid);
      if (hProcess == NULL && GetLastError() == ERROR_ACCESS_DENIED) {
!         hProcess = doPrivilegedOpenProcess(PROCESS_ALL_ACCESS, FALSE, (DWORD)pid);
      }
  
      if (hProcess == NULL) {
          if (GetLastError() == ERROR_INVALID_PARAMETER) {
              JNU_ThrowIOException(env, "no such process");
          } else {
!             JNU_ThrowIOExceptionWithLastError(env, "OpenProcess failed");
          }
          return (jlong)0;
      }
  
      /*
       * On Windows 64-bit we need to handle 32-bit tools trying to attach to 64-bit
       * processes (and visa versa). X-architecture attaching is currently not supported
       * by this implementation.
--- 171,220 ----
   * Signature: (I)J
   */
  JNIEXPORT jlong JNICALL Java_sun_tools_attach_WindowsVirtualMachine_openProcess
    (JNIEnv *env, jclass cls, jint pid)
  {
!     HANDLE hProcess = NULL;
  
+     if (pid == (jint) GetCurrentProcessId()) {
+         /* process is attaching to itself; get a pseudo handle instead */
+         hProcess = GetCurrentProcess();
+         /* duplicate the pseudo handle so it can be used in more contexts */
+         if (DuplicateHandle(hProcess, hProcess, hProcess, &hProcess,
+                 PROCESS_ALL_ACCESS, FALSE, 0) == 0) {
              /*
+              * Could not duplicate the handle which isn't a good sign,
+              * but we'll try again with OpenProcess() below.
+              */
+             hProcess = NULL;
+         }
+     }
+ 
+     if (hProcess == NULL) {
+         /*
           * Attempt to open process. If it fails then we try to enable the
           * SE_DEBUG_NAME privilege and retry.
           */
          hProcess = OpenProcess(PROCESS_ALL_ACCESS, FALSE, (DWORD)pid);
          if (hProcess == NULL && GetLastError() == ERROR_ACCESS_DENIED) {
!             hProcess = doPrivilegedOpenProcess(PROCESS_ALL_ACCESS, FALSE,
!                            (DWORD)pid);
          }
  
          if (hProcess == NULL) {
              if (GetLastError() == ERROR_INVALID_PARAMETER) {
                  JNU_ThrowIOException(env, "no such process");
              } else {
!                 char err_mesg[255];
!                 /* include the last error in the default detail message */
!                 sprintf(err_mesg, "OpenProcess(pid=%d) failed; LastError=%d",
!                     (int)pid, (int)GetLastError());
!                 JNU_ThrowIOExceptionWithLastError(env, err_mesg);
              }
              return (jlong)0;
          }
+     }
  
      /*
       * On Windows 64-bit we need to handle 32-bit tools trying to attach to 64-bit
       * processes (and visa versa). X-architecture attaching is currently not supported
       * by this implementation.