/*
* Class: sun_tools_attach_WindowsVirtualMachine
* Method: openProcess
* 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.
*/
if (_IsWow64Process != NULL) {
BOOL isCurrent32bit, isTarget32bit;
(*_IsWow64Process)(GetCurrentProcess(), &isCurrent32bit);
(*_IsWow64Process)(hProcess, &isTarget32bit);
if (isCurrent32bit != isTarget32bit) {
CloseHandle(hProcess);
#ifdef _WIN64
JNU_ThrowByName(env, "com/sun/tools/attach/AttachNotSupportedException",
"Unable to attach to 32-bit process running under WOW64");
#else
JNU_ThrowByName(env, "com/sun/tools/attach/AttachNotSupportedException",
"Unable to attach to 64-bit process");
#endif
}
}
return (jlong)hProcess;
}
/*
* Class: sun_tools_attach_VirtualMachineImpl
* Method: openProcess
* Signature: (I)J
*/
JNIEXPORT jlong JNICALL Java_sun_tools_attach_VirtualMachineImpl_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=0x%x",
(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.
*/
if (_IsWow64Process != NULL) {
BOOL isCurrent32bit, isTarget32bit;
(*_IsWow64Process)(GetCurrentProcess(), &isCurrent32bit);
(*_IsWow64Process)(hProcess, &isTarget32bit);
if (isCurrent32bit != isTarget32bit) {
CloseHandle(hProcess);
#ifdef _WIN64
JNU_ThrowByName(env, "com/sun/tools/attach/AttachNotSupportedException",
"Unable to attach to 32-bit process running under WOW64");
#else
JNU_ThrowByName(env, "com/sun/tools/attach/AttachNotSupportedException",
"Unable to attach to 64-bit process");
#endif
}
}
return (jlong)hProcess;
}
