org.apache.tomcat.jni.OS Java Examples

/**
 * Create the sendfile poller. With some versions of APR, the maximum
 * poller size will be 62 (recompiling APR is necessary to remove this
 * limitation).
 */
protected void init() {
    pool = Pool.create(serverSockPool);
    int size = sendfileSize;
    if (size <= 0) {
        size = (OS.IS_WIN32 || OS.IS_WIN64) ? (1 * 1024) : (16 * 1024);
    }
    sendfilePollset = allocatePoller(size, pool, getSoTimeout());
    if (sendfilePollset == 0 && size > 1024) {
        size = 1024;
        sendfilePollset = allocatePoller(size, pool, getSoTimeout());
    }
    if (sendfilePollset == 0) {
        size = 62;
        sendfilePollset = allocatePoller(size, pool, getSoTimeout());
    }
    desc = new long[size * 2];
    sendfileData = new HashMap<Long, SendfileData>(size);
    addS = new ArrayList<SendfileData>();
}
 

/**
 * Create the sendfile poller. With some versions of APR, the maximum
 * poller size will be 62 (recompiling APR is necessary to remove this
 * limitation).
 */
protected void init() {
    pool = Pool.create(serverSockPool);
    int size = sendfileSize;
    if (size <= 0) {
        size = (OS.IS_WIN32 || OS.IS_WIN64) ? (1 * 1024) : (16 * 1024);
    }
    sendfilePollset = allocatePoller(size, pool, getSoTimeout());
    if (sendfilePollset == 0 && size > 1024) {
        size = 1024;
        sendfilePollset = allocatePoller(size, pool, getSoTimeout());
    }
    if (sendfilePollset == 0) {
        size = 62;
        sendfilePollset = allocatePoller(size, pool, getSoTimeout());
    }
    desc = new long[size * 2];
    sendfileData = new HashMap<Long, SendfileData>(size);
    addS = new ArrayList<SendfileData>();
}
 

/**
 * Create the poller. With some versions of APR, the maximum poller size
 * will be 62 (recompiling APR is necessary to remove this limitation).
 */
protected synchronized void init() {

    pool = Pool.create(serverSockPool);

    // Single poller by default
    int defaultPollerSize = getMaxConnections();

    if ((OS.IS_WIN32 || OS.IS_WIN64) && (defaultPollerSize > 1024)) {
        // The maximum per poller to get reasonable performance is 1024
        // Adjust poller size so that it won't reach the limit. This is
        // a limitation of XP / Server 2003 that has been fixed in
        // Vista / Server 2008 onwards.
        actualPollerSize = 1024;
    } else {
        actualPollerSize = defaultPollerSize;
    }

    timeouts = new SocketTimeouts(defaultPollerSize);

    // At the moment, setting the timeout is useless, but it could get
    // used again as the normal poller could be faster using maintain.
    // It might not be worth bothering though.
    long pollset = allocatePoller(actualPollerSize, pool, -1);
    if (pollset == 0 && actualPollerSize > 1024) {
        actualPollerSize = 1024;
        pollset = allocatePoller(actualPollerSize, pool, -1);
    }
    if (pollset == 0) {
        actualPollerSize = 62;
        pollset = allocatePoller(actualPollerSize, pool, -1);
    }

    pollerCount = defaultPollerSize / actualPollerSize;
    pollerTime = pollTime / pollerCount;
    nextPollerTime = pollerTime;

    pollers = new long[pollerCount];
    pollers[0] = pollset;
    for (int i = 1; i < pollerCount; i++) {
        pollers[i] = allocatePoller(actualPollerSize, pool, -1);
    }

    pollerSpace = new int[pollerCount];
    for (int i = 0; i < pollerCount; i++) {
        pollerSpace[i] = actualPollerSize;
    }

    /*
     * x2 - One descriptor for the socket, one for the event(s).
     * x2 - Some APR implementations return multiple events for the
     *      same socket as different entries. Each socket is registered
     *      for a maximum of two events (read and write) at any one
     *      time.
     *
     * Therefore size is actual poller size *4.
     */
    desc = new long[actualPollerSize * 4];
    connectionCount.set(0);
    addList = new SocketList(defaultPollerSize);
    closeList = new SocketList(defaultPollerSize);
}
 

private int fillReadBuffer(boolean block, ByteBuffer to) throws IOException {
    if (closed) {
        throw new IOException(sm.getString("socket.apr.closed", getSocket()));
    }

    Lock readLock = getBlockingStatusReadLock();
    WriteLock writeLock = getBlockingStatusWriteLock();

    boolean readDone = false;
    int result = 0;
    readLock.lock();
    try {
        if (getBlockingStatus() == block) {
            if (block) {
                Socket.timeoutSet(getSocket().longValue(), getReadTimeout() * 1000);
            }
            result = Socket.recvb(getSocket().longValue(), to, to.position(),
                    to.remaining());
            readDone = true;
        }
    } finally {
        readLock.unlock();
    }

    if (!readDone) {
        writeLock.lock();
        try {
            // Set the current settings for this socket
            setBlockingStatus(block);
            if (block) {
                Socket.timeoutSet(getSocket().longValue(), getReadTimeout() * 1000);
            } else {
                Socket.timeoutSet(getSocket().longValue(), 0);
            }
            // Downgrade the lock
            readLock.lock();
            try {
                writeLock.unlock();
                result = Socket.recvb(getSocket().longValue(), to, to.position(),
                        to.remaining());
            } finally {
                readLock.unlock();
            }
        } finally {
            // Should have been released above but may not have been on some
            // exception paths
            if (writeLock.isHeldByCurrentThread()) {
                writeLock.unlock();
            }
        }
    }

    if (result > 0) {
        to.position(to.position() + result);
        return result;
    } else if (result == 0 || -result == Status.EAGAIN) {
        return 0;
    } else if ((-result) == Status.ETIMEDOUT || (-result) == Status.TIMEUP) {
        if (block) {
            throw new SocketTimeoutException(sm.getString("iib.readtimeout"));
        } else {
            // Attempting to read from the socket when the poller
            // has not signalled that there is data to read appears
            // to behave like a blocking read with a short timeout
            // on OSX rather than like a non-blocking read. If no
            // data is read, treat the resulting timeout like a
            // non-blocking read that returned no data.
            return 0;
        }
    } else if (-result == Status.APR_EOF) {
        return -1;
    } else if ((OS.IS_WIN32 || OS.IS_WIN64) &&
            (-result == Status.APR_OS_START_SYSERR + 10053)) {
        // 10053 on Windows is connection aborted
        throw new EOFException(sm.getString("socket.apr.clientAbort"));
    } else {
        throw new IOException(sm.getString("socket.apr.read.error",
                Integer.valueOf(-result), getSocket(), this));
    }
}
 

private void doWriteInternal(ByteBuffer from) throws IOException {
    int thisTime;

    do {
        thisTime = 0;
        if (getEndpoint().isSSLEnabled()) {
            if (sslOutputBuffer.remaining() == 0) {
                // Buffer was fully written last time around
                sslOutputBuffer.clear();
                transfer(from, sslOutputBuffer);
                sslOutputBuffer.flip();
            } else {
                // Buffer still has data from previous attempt to write
                // APR + SSL requires that exactly the same parameters are
                // passed when re-attempting the write
            }
            thisTime = Socket.sendb(getSocket().longValue(), sslOutputBuffer,
                    sslOutputBuffer.position(), sslOutputBuffer.limit());
            if (thisTime > 0) {
                sslOutputBuffer.position(sslOutputBuffer.position() + thisTime);
            }
        } else {
            thisTime = Socket.sendb(getSocket().longValue(), from, from.position(),
                    from.remaining());
            if (thisTime > 0) {
                from.position(from.position() + thisTime);
            }
        }
        if (Status.APR_STATUS_IS_EAGAIN(-thisTime)) {
            thisTime = 0;
        } else if (-thisTime == Status.APR_EOF) {
            throw new EOFException(sm.getString("socket.apr.clientAbort"));
        } else if ((OS.IS_WIN32 || OS.IS_WIN64) &&
                (-thisTime == Status.APR_OS_START_SYSERR + 10053)) {
            // 10053 on Windows is connection aborted
            throw new EOFException(sm.getString("socket.apr.clientAbort"));
        } else if (thisTime < 0) {
            throw new IOException(sm.getString("socket.apr.write.error",
                    Integer.valueOf(-thisTime), getSocket(), this));
        }
    } while ((thisTime > 0 || getBlockingStatus()) && from.hasRemaining());

    // If there is data left in the buffer the socket will be registered for
    // write further up the stack. This is to ensure the socket is only
    // registered for write once as both container and user code can trigger
    // write registration.
}
 

private long createAprSocket(int port, long pool)
             throws Exception {
    /**
     * Server socket "pointer".
     */
    long serverSock = 0;

    String address = InetAddress.getByName("localhost").getHostAddress();

    // Create the APR address that will be bound
    int family = Socket.APR_INET;
    if (Library.APR_HAVE_IPV6) {
        if (!OS.IS_BSD && !OS.IS_WIN32 && !OS.IS_WIN64)
            family = Socket.APR_UNSPEC;
     }

    long inetAddress = 0;
    try {
        inetAddress = Address.info(address, family,
                                   port, 0, pool);
        // Create the APR server socket
        serverSock = Socket.create(Address.getInfo(inetAddress).family,
                                   Socket.SOCK_STREAM,
                                   Socket.APR_PROTO_TCP, pool);
    } catch (Exception ex) {
        log.error("Could not create socket for address '" + address + "'");
        return 0;
    }

    if (OS.IS_UNIX) {
        Socket.optSet(serverSock, Socket.APR_SO_REUSEADDR, 1);
    }
    // Deal with the firewalls that tend to drop the inactive sockets
    Socket.optSet(serverSock, Socket.APR_SO_KEEPALIVE, 1);
    // Bind the server socket
    int ret = Socket.bind(serverSock, inetAddress);
    if (ret != 0) {
        log.error("Could not bind: " + Error.strerror(ret));
        throw (new Exception(Error.strerror(ret)));
    }
    return serverSock;
}
 

private int doWriteInternal(byte[] b, int off, int len) throws IOException {

        int start = off;
        int left = len;
        int written;

        do {
            if (endpoint.isSSLEnabled()) {
                if (sslOutputBuffer.remaining() == 0) {
                    // Buffer was fully written last time around
                    sslOutputBuffer.clear();
                    if (left < SSL_OUTPUT_BUFFER_SIZE) {
                        sslOutputBuffer.put(b, start, left);
                    } else {
                        sslOutputBuffer.put(b, start, SSL_OUTPUT_BUFFER_SIZE);
                    }
                    sslOutputBuffer.flip();
                } else {
                    // Buffer still has data from previous attempt to write
                    // APR + SSL requires that exactly the same parameters are
                    // passed when re-attempting the write
                }
                written = Socket.sendb(socket, sslOutputBuffer,
                        sslOutputBuffer.position(), sslOutputBuffer.limit());
                if (written > 0) {
                    sslOutputBuffer.position(
                            sslOutputBuffer.position() + written);
                }
            } else {
                written = Socket.send(socket, b, start, left);
            }
            if (Status.APR_STATUS_IS_EAGAIN(-written)) {
                written = 0;
            } else if (-written == Status.APR_EOF) {
                throw new EOFException(sm.getString("apr.clientAbort"));
            } else if ((OS.IS_WIN32 || OS.IS_WIN64) &&
                    (-written == Status.APR_OS_START_SYSERR + 10053)) {
                // 10053 on Windows is connection aborted
                throw new EOFException(sm.getString("apr.clientAbort"));
            } else if (written < 0) {
                throw new IOException(sm.getString("apr.write.error",
                        Integer.valueOf(-written), Long.valueOf(socket), wrapper));
            }
            start += written;
            left -= written;
        } while (written > 0 && left > 0);

        if (left > 0) {
            endpoint.getPoller().add(socket, -1, false, true);
        }
        return len - left;
    }
 

@Override
protected int doRead(boolean block, byte[] b, int off, int len)
        throws IOException {

    if (closed) {
        throw new IOException(sm.getString("apr.closed", Long.valueOf(socket)));
    }

    Lock readLock = wrapper.getBlockingStatusReadLock();
    WriteLock writeLock = wrapper.getBlockingStatusWriteLock();

    boolean readDone = false;
    int result = 0;
    try {
        readLock.lock();
        if (wrapper.getBlockingStatus() == block) {
            result = Socket.recv(socket, b, off, len);
            readDone = true;
        }
    } finally {
        readLock.unlock();
    }

    if (!readDone) {
        try {
            writeLock.lock();
            wrapper.setBlockingStatus(block);
            // Set the current settings for this socket
            Socket.optSet(socket, Socket.APR_SO_NONBLOCK, (block ? 0 : 1));
            // Downgrade the lock
            try {
                readLock.lock();
                writeLock.unlock();
                result = Socket.recv(socket, b, off, len);
            } finally {
                readLock.unlock();
            }
        } finally {
            // Should have been released above but may not have been on some
            // exception paths
            if (writeLock.isHeldByCurrentThread()) {
                writeLock.unlock();
            }
        }
    }

    if (result > 0) {
        eagain = false;
        return result;
    } else if (-result == Status.EAGAIN) {
        eagain = true;
        return 0;
    } else if (-result == Status.APR_EGENERAL && wrapper.isSecure()) {
        // Not entirely sure why this is necessary. Testing to date has not
        // identified any issues with this but log it so it can be tracked
        // if it is suspected of causing issues in the future.
        if (log.isDebugEnabled()) {
            log.debug(sm.getString("apr.read.sslGeneralError",
                    Long.valueOf(socket), wrapper));
        }
        eagain = true;
        return 0;
    } else if (-result == Status.APR_EOF) {
        throw new EOFException(sm.getString("apr.clientAbort"));
    } else if ((OS.IS_WIN32 || OS.IS_WIN64) &&
            (-result == Status.APR_OS_START_SYSERR + 10053)) {
        // 10053 on Windows is connection aborted
        throw new EOFException(sm.getString("apr.clientAbort"));
    } else {
        throw new IOException(sm.getString("apr.read.error",
                Integer.valueOf(-result), Long.valueOf(socket), wrapper));
    }
}
 

/**
 * Create the poller. With some versions of APR, the maximum poller size
 * will be 62 (recompiling APR is necessary to remove this limitation).
 */
protected void init() {

    pool = Pool.create(serverSockPool);

    // Single poller by default
    int defaultPollerSize = getMaxConnections();

    if ((OS.IS_WIN32 || OS.IS_WIN64) && (defaultPollerSize > 1024)) {
        // The maximum per poller to get reasonable performance is 1024
        // Adjust poller size so that it won't reach the limit. This is
        // a limitation of XP / Server 2003 that has been fixed in
        // Vista / Server 2008 onwards.
        actualPollerSize = 1024;
    } else {
        actualPollerSize = defaultPollerSize;
    }

    timeouts = new SocketTimeouts(defaultPollerSize);

    // At the moment, setting the timeout is useless, but it could get
    // used again as the normal poller could be faster using maintain.
    // It might not be worth bothering though.
    long pollset = allocatePoller(actualPollerSize, pool, -1);
    if (pollset == 0 && actualPollerSize > 1024) {
        actualPollerSize = 1024;
        pollset = allocatePoller(actualPollerSize, pool, -1);
    }
    if (pollset == 0) {
        actualPollerSize = 62;
        pollset = allocatePoller(actualPollerSize, pool, -1);
    }

    pollerCount = defaultPollerSize / actualPollerSize;
    pollerTime = pollTime / pollerCount;
    nextPollerTime = pollerTime;

    pollers = new long[pollerCount];
    pollers[0] = pollset;
    for (int i = 1; i < pollerCount; i++) {
        pollers[i] = allocatePoller(actualPollerSize, pool, -1);
    }

    pollerSpace = new int[pollerCount];
    for (int i = 0; i < pollerCount; i++) {
        pollerSpace[i] = actualPollerSize;
    }

    desc = new long[actualPollerSize * 2];
    connectionCount.set(0);
    addList = new SocketList(defaultPollerSize);
    closeList = new SocketList(defaultPollerSize);
}
 

private long createAprSocket(int port, long pool)
             throws Exception {
    /**
     * Server socket "pointer".
     */
    long serverSock = 0;

    String address = InetAddress.getByName("localhost").getHostAddress();

    // Create the APR address that will be bound
    int family = Socket.APR_INET;
    if (Library.APR_HAVE_IPV6) {
        if (!OS.IS_BSD && !OS.IS_WIN32 && !OS.IS_WIN64)
            family = Socket.APR_UNSPEC;
     }

    long inetAddress = 0;
    try {
        inetAddress = Address.info(address, family,
                                   port, 0, pool);
        // Create the APR server socket
        serverSock = Socket.create(Address.getInfo(inetAddress).family,
                                   Socket.SOCK_STREAM,
                                   Socket.APR_PROTO_TCP, pool);
    } catch (Exception ex) {
        log.error("Could not create socket for address '" + address + "'");
        return 0;
    }

    if (OS.IS_UNIX) {
        Socket.optSet(serverSock, Socket.APR_SO_REUSEADDR, 1);
    }
    // Deal with the firewalls that tend to drop the inactive sockets
    Socket.optSet(serverSock, Socket.APR_SO_KEEPALIVE, 1);
    // Bind the server socket
    int ret = Socket.bind(serverSock, inetAddress);
    if (ret != 0) {
        log.error("Could not bind: " + Error.strerror(ret));
        throw (new Exception(Error.strerror(ret)));
    }
    return serverSock;
}
 

private int doWriteInternal(byte[] b, int off, int len) throws IOException {

        int start = off;
        int left = len;
        int written;

        do {
            if (endpoint.isSSLEnabled()) {
                if (sslOutputBuffer.remaining() == 0) {
                    // Buffer was fully written last time around
                    sslOutputBuffer.clear();
                    if (left < SSL_OUTPUT_BUFFER_SIZE) {
                        sslOutputBuffer.put(b, start, left);
                    } else {
                        sslOutputBuffer.put(b, start, SSL_OUTPUT_BUFFER_SIZE);
                    }
                    sslOutputBuffer.flip();
                } else {
                    // Buffer still has data from previous attempt to write
                    // APR + SSL requires that exactly the same parameters are
                    // passed when re-attempting the write
                }
                written = Socket.sendb(socket, sslOutputBuffer,
                        sslOutputBuffer.position(), sslOutputBuffer.limit());
                if (written > 0) {
                    sslOutputBuffer.position(
                            sslOutputBuffer.position() + written);
                }
            } else {
                written = Socket.send(socket, b, start, left);
            }
            if (Status.APR_STATUS_IS_EAGAIN(-written)) {
                written = 0;
            } else if (-written == Status.APR_EOF) {
                throw new EOFException(sm.getString("apr.clientAbort"));
            } else if ((OS.IS_WIN32 || OS.IS_WIN64) &&
                    (-written == Status.APR_OS_START_SYSERR + 10053)) {
                // 10053 on Windows is connection aborted
                throw new EOFException(sm.getString("apr.clientAbort"));
            } else if (written < 0) {
                throw new IOException(sm.getString("apr.write.error",
                        Integer.valueOf(-written), Long.valueOf(socket), wrapper));
            }
            start += written;
            left -= written;
        } while (written > 0 && left > 0);

        if (left > 0) {
            endpoint.getPoller().add(socket, -1, false, true);
        }
        return len - left;
    }
 

@Override
protected int doRead(boolean block, byte[] b, int off, int len)
        throws IOException {

    if (closed) {
        throw new IOException(sm.getString("apr.closed", Long.valueOf(socket)));
    }

    Lock readLock = wrapper.getBlockingStatusReadLock();
    WriteLock writeLock = wrapper.getBlockingStatusWriteLock();

    boolean readDone = false;
    int result = 0;
    try {
        readLock.lock();
        if (wrapper.getBlockingStatus() == block) {
            result = Socket.recv(socket, b, off, len);
            readDone = true;
        }
    } finally {
        readLock.unlock();
    }

    if (!readDone) {
        try {
            writeLock.lock();
            wrapper.setBlockingStatus(block);
            // Set the current settings for this socket
            Socket.optSet(socket, Socket.APR_SO_NONBLOCK, (block ? 0 : 1));
            // Downgrade the lock
            try {
                readLock.lock();
                writeLock.unlock();
                result = Socket.recv(socket, b, off, len);
            } finally {
                readLock.unlock();
            }
        } finally {
            // Should have been released above but may not have been on some
            // exception paths
            if (writeLock.isHeldByCurrentThread()) {
                writeLock.unlock();
            }
        }
    }

    if (result > 0) {
        eagain = false;
        return result;
    } else if (-result == Status.EAGAIN) {
        eagain = true;
        return 0;
    } else if (-result == Status.APR_EGENERAL && wrapper.isSecure()) {
        // Not entirely sure why this is necessary. Testing to date has not
        // identified any issues with this but log it so it can be tracked
        // if it is suspected of causing issues in the future.
        if (log.isDebugEnabled()) {
            log.debug(sm.getString("apr.read.sslGeneralError",
                    Long.valueOf(socket), wrapper));
        }
        eagain = true;
        return 0;
    } else if (-result == Status.APR_EOF) {
        throw new EOFException(sm.getString("apr.clientAbort"));
    } else if ((OS.IS_WIN32 || OS.IS_WIN64) &&
            (-result == Status.APR_OS_START_SYSERR + 10053)) {
        // 10053 on Windows is connection aborted
        throw new EOFException(sm.getString("apr.clientAbort"));
    } else {
        throw new IOException(sm.getString("apr.read.error",
                Integer.valueOf(-result), Long.valueOf(socket), wrapper));
    }
}
 

/**
 * Create the poller. With some versions of APR, the maximum poller size
 * will be 62 (recompiling APR is necessary to remove this limitation).
 */
protected void init() {

    pool = Pool.create(serverSockPool);

    // Single poller by default
    int defaultPollerSize = getMaxConnections();

    if ((OS.IS_WIN32 || OS.IS_WIN64) && (defaultPollerSize > 1024)) {
        // The maximum per poller to get reasonable performance is 1024
        // Adjust poller size so that it won't reach the limit. This is
        // a limitation of XP / Server 2003 that has been fixed in
        // Vista / Server 2008 onwards.
        actualPollerSize = 1024;
    } else {
        actualPollerSize = defaultPollerSize;
    }

    timeouts = new SocketTimeouts(defaultPollerSize);

    // At the moment, setting the timeout is useless, but it could get
    // used again as the normal poller could be faster using maintain.
    // It might not be worth bothering though.
    long pollset = allocatePoller(actualPollerSize, pool, -1);
    if (pollset == 0 && actualPollerSize > 1024) {
        actualPollerSize = 1024;
        pollset = allocatePoller(actualPollerSize, pool, -1);
    }
    if (pollset == 0) {
        actualPollerSize = 62;
        pollset = allocatePoller(actualPollerSize, pool, -1);
    }

    pollerCount = defaultPollerSize / actualPollerSize;
    pollerTime = pollTime / pollerCount;
    nextPollerTime = pollerTime;

    pollers = new long[pollerCount];
    pollers[0] = pollset;
    for (int i = 1; i < pollerCount; i++) {
        pollers[i] = allocatePoller(actualPollerSize, pool, -1);
    }

    pollerSpace = new int[pollerCount];
    for (int i = 0; i < pollerCount; i++) {
        pollerSpace[i] = actualPollerSize;
    }

    desc = new long[actualPollerSize * 2];
    connectionCount.set(0);
    addList = new SocketList(defaultPollerSize);
    closeList = new SocketList(defaultPollerSize);
}
 

private long createAprSocket(int port, long pool)
             throws Exception {
    /**
     * Server socket "pointer".
     */
    long serverSock = 0;

    String address = InetAddress.getByName("localhost").getHostAddress();

    // Create the APR address that will be bound
    int family = Socket.APR_INET;
    if (Library.APR_HAVE_IPV6) {
        if (!OS.IS_BSD && !OS.IS_WIN32 && !OS.IS_WIN64)
            family = Socket.APR_UNSPEC;
     }

    long inetAddress = 0;
    try {
        inetAddress = Address.info(address, family,
                                   port, 0, pool);
        // Create the APR server socket
        serverSock = Socket.create(Address.getInfo(inetAddress).family,
                                   Socket.SOCK_STREAM,
                                   Socket.APR_PROTO_TCP, pool);
    } catch (Exception ex) {
        log.error("Could not create socket for address '" + address + "'");
        return 0;
    }

    if (OS.IS_UNIX) {
        Socket.optSet(serverSock, Socket.APR_SO_REUSEADDR, 1);
    }
    // Deal with the firewalls that tend to drop the inactive sockets
    Socket.optSet(serverSock, Socket.APR_SO_KEEPALIVE, 1);
    // Bind the server socket
    int ret = Socket.bind(serverSock, inetAddress);
    if (ret != 0) {
        log.error("Could not bind: " + Error.strerror(ret));
        throw (new Exception(Error.strerror(ret)));
    }
    return serverSock;
}