Examples with Pointer com.sun.jna.Pointer used on opensource projects

Example 1 with Pointer

use of com.sun.jna.Pointer in project elasticsearch by elastic.

the class JNANatives method tryVirtualLock.

static void tryVirtualLock() {
    JNAKernel32Library kernel = JNAKernel32Library.getInstance();
    Pointer process = null;
    try {
        process = kernel.GetCurrentProcess();
        // By default, Windows limits the number of pages that can be locked.
        // Thus, we need to first increase the working set size of the JVM by
        // the amount of memory we wish to lock, plus a small overhead (1MB).
        SizeT size = new SizeT(JvmInfo.jvmInfo().getMem().getHeapInit().getBytes() + (1024 * 1024));
        if (!kernel.SetProcessWorkingSetSize(process, size, size)) {
            logger.warn("Unable to lock JVM memory. Failed to set working set size. Error code {}", Native.getLastError());
        } else {
            JNAKernel32Library.MemoryBasicInformation memInfo = new JNAKernel32Library.MemoryBasicInformation();
            long address = 0;
            while (kernel.VirtualQueryEx(process, new Pointer(address), memInfo, memInfo.size()) != 0) {
                boolean lockable = memInfo.State.longValue() == JNAKernel32Library.MEM_COMMIT && (memInfo.Protect.longValue() & JNAKernel32Library.PAGE_NOACCESS) != JNAKernel32Library.PAGE_NOACCESS && (memInfo.Protect.longValue() & JNAKernel32Library.PAGE_GUARD) != JNAKernel32Library.PAGE_GUARD;
                if (lockable) {
                    kernel.VirtualLock(memInfo.BaseAddress, new SizeT(memInfo.RegionSize.longValue()));
                }
                // Move to the next region
                address += memInfo.RegionSize.longValue();
            }
            LOCAL_MLOCKALL = true;
        }
    } catch (UnsatisfiedLinkError e) {
    // this will have already been logged by Kernel32Library, no need to repeat it
    } finally {
        if (process != null) {
            kernel.CloseHandle(process);
        }
    }
}

Example 2 with Pointer

use of com.sun.jna.Pointer in project elasticsearch by elastic.

the class SystemCallFilter method windowsImpl.

// windows impl via job ActiveProcessLimit
static void windowsImpl() {
    if (!Constants.WINDOWS) {
        throw new IllegalStateException("bug: should not be trying to initialize ActiveProcessLimit for an unsupported OS");
    }
    JNAKernel32Library lib = JNAKernel32Library.getInstance();
    // create a new Job
    Pointer job = lib.CreateJobObjectW(null, null);
    if (job == null) {
        throw new UnsupportedOperationException("CreateJobObject: " + Native.getLastError());
    }
    try {
        // retrieve the current basic limits of the job
        int clazz = JNAKernel32Library.JOBOBJECT_BASIC_LIMIT_INFORMATION_CLASS;
        JNAKernel32Library.JOBOBJECT_BASIC_LIMIT_INFORMATION limits = new JNAKernel32Library.JOBOBJECT_BASIC_LIMIT_INFORMATION();
        limits.write();
        if (!lib.QueryInformationJobObject(job, clazz, limits.getPointer(), limits.size(), null)) {
            throw new UnsupportedOperationException("QueryInformationJobObject: " + Native.getLastError());
        }
        limits.read();
        // modify the number of active processes to be 1 (exactly the one process we will add to the job).
        limits.ActiveProcessLimit = 1;
        limits.LimitFlags = JNAKernel32Library.JOB_OBJECT_LIMIT_ACTIVE_PROCESS;
        limits.write();
        if (!lib.SetInformationJobObject(job, clazz, limits.getPointer(), limits.size())) {
            throw new UnsupportedOperationException("SetInformationJobObject: " + Native.getLastError());
        }
        // assign ourselves to the job
        if (!lib.AssignProcessToJobObject(job, lib.GetCurrentProcess())) {
            throw new UnsupportedOperationException("AssignProcessToJobObject: " + Native.getLastError());
        }
    } finally {
        lib.CloseHandle(job);
    }
    logger.debug("Windows ActiveProcessLimit initialization successful");
}

Example 3 with Pointer

use of com.sun.jna.Pointer in project jmonkeyengine by jMonkeyEngine.

the class OpenVR method getType.

@Override
public HmdType getType() {
    if (vrsystemFunctions != null) {
        Pointer str1 = new Memory(128);
        Pointer str2 = new Memory(128);
        String completeName = "";
        vrsystemFunctions.GetStringTrackedDeviceProperty.apply(JOpenVRLibrary.k_unTrackedDeviceIndex_Hmd, JOpenVRLibrary.ETrackedDeviceProperty.ETrackedDeviceProperty_Prop_ManufacturerName_String, str1, 128, hmdErrorStore);
        if (hmdErrorStore.getValue() == 0)
            completeName += str1.getString(0);
        vrsystemFunctions.GetStringTrackedDeviceProperty.apply(JOpenVRLibrary.k_unTrackedDeviceIndex_Hmd, JOpenVRLibrary.ETrackedDeviceProperty.ETrackedDeviceProperty_Prop_ModelNumber_String, str2, 128, hmdErrorStore);
        if (hmdErrorStore.getValue() == 0)
            completeName += " " + str2.getString(0);
        if (completeName.length() > 0) {
            completeName = completeName.toLowerCase(Locale.ENGLISH).trim();
            if (completeName.contains("htc") || completeName.contains("vive")) {
                return HmdType.HTC_VIVE;
            } else if (completeName.contains("osvr")) {
                return HmdType.OSVR;
            } else if (completeName.contains("oculus") || completeName.contains("rift") || completeName.contains("dk1") || completeName.contains("dk2") || completeName.contains("cv1")) {
                return HmdType.OCULUS_RIFT;
            } else if (completeName.contains("fove")) {
                return HmdType.FOVE;
            } else if (completeName.contains("game") && completeName.contains("face")) {
                return HmdType.GAMEFACE;
            } else if (completeName.contains("morpheus")) {
                return HmdType.MORPHEUS;
            } else if (completeName.contains("gear")) {
                return HmdType.GEARVR;
            } else if (completeName.contains("star")) {
                return HmdType.STARVR;
            } else if (completeName.contains("null")) {
                return HmdType.NULL;
            }
        }
    } else
        return HmdType.NONE;
    return HmdType.OTHER;
}

Example 4 with Pointer

use of com.sun.jna.Pointer in project jna by java-native-access.

the class Advapi32Test method testCreateWellKnownSid.

public void testCreateWellKnownSid() {
    PSID pSid = new PSID(WinNT.SECURITY_MAX_SID_SIZE);
    IntByReference cbSid = new IntByReference(WinNT.SECURITY_MAX_SID_SIZE);
    assertTrue("Failed to create well-known SID", Advapi32.INSTANCE.CreateWellKnownSid(WELL_KNOWN_SID_TYPE.WinWorldSid, null, pSid, cbSid));
    assertTrue("Not recognized as well-known SID", Advapi32.INSTANCE.IsWellKnownSid(pSid, WELL_KNOWN_SID_TYPE.WinWorldSid));
    assertTrue("Invalid SID size", cbSid.getValue() <= WinNT.SECURITY_MAX_SID_SIZE);
    PointerByReference convertedSidStringPtr = new PointerByReference();
    assertTrue("Failed to convert SID", Advapi32.INSTANCE.ConvertSidToStringSid(pSid, convertedSidStringPtr));
    Pointer conv = convertedSidStringPtr.getValue();
    try {
        String convertedSidString = conv.getWideString(0);
        assertEquals("Mismatched SID string", EVERYONE, convertedSidString);
    } finally {
        Kernel32Util.freeLocalMemory(conv);
    }
}

Example 5 with Pointer

use of com.sun.jna.Pointer in project jna by java-native-access.

the class Advapi32Test method testReadEventLogEntries.

public void testReadEventLogEntries() {
    HANDLE h = Advapi32.INSTANCE.OpenEventLog(null, "Application");
    IntByReference pnBytesRead = new IntByReference();
    IntByReference pnMinNumberOfBytesNeeded = new IntByReference();
    Memory buffer = new Memory(1024 * 64);
    // shorten test, avoid iterating through all events
    int maxReads = 3;
    int rc = 0;
    while (true) {
        if (maxReads-- <= 0)
            break;
        if (!Advapi32.INSTANCE.ReadEventLog(h, WinNT.EVENTLOG_SEQUENTIAL_READ | WinNT.EVENTLOG_FORWARDS_READ, 0, buffer, (int) buffer.size(), pnBytesRead, pnMinNumberOfBytesNeeded)) {
            rc = Kernel32.INSTANCE.GetLastError();
            if (rc == W32Errors.ERROR_INSUFFICIENT_BUFFER) {
                buffer = new Memory(pnMinNumberOfBytesNeeded.getValue());
                rc = 0;
                continue;
            }
            break;
        }
        int dwRead = pnBytesRead.getValue();
        Pointer pevlr = buffer;
        int maxRecords = 3;
        while (dwRead > 0 && maxRecords-- > 0) {
            EVENTLOGRECORD record = new EVENTLOGRECORD(pevlr);
            /*
                  System.out.println(record.RecordNumber.intValue()
                  + " Event ID: " + record.EventID.intValue()
                  + " Event Type: " + record.EventType.intValue()
                  + " Event Source: " + pevlr.getString(record.size(), true));
                */
            dwRead -= record.Length.intValue();
            pevlr = pevlr.share(record.Length.intValue());
        }
    }
    assertTrue("Unexpected error after reading event log: " + new Win32Exception(rc), rc == W32Errors.ERROR_HANDLE_EOF || rc == 0);
    assertTrue("Error closing event log", Advapi32.INSTANCE.CloseEventLog(h));
}