/*
* Copyright (c) 2018, 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
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package jdk.internal.net.rdma;
import java.io.FileDescriptor;
import java.io.IOException;
import java.net.Inet4Address;
import java.net.Inet6Address;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.ProtocolFamily;
import java.net.Socket;
import java.net.SocketAddress;
import java.net.SocketOption;
import java.net.StandardSocketOptions;
import java.nio.ByteBuffer;
import java.nio.channels.AlreadyBoundException;
import java.nio.channels.AlreadyConnectedException;
import java.nio.channels.AsynchronousCloseException;
import java.nio.channels.ClosedChannelException;
import java.nio.channels.ConnectionPendingException;
import java.nio.channels.NoConnectionPendingException;
import java.nio.channels.NotYetConnectedException;
import java.nio.channels.SelectionKey;
import java.nio.channels.SocketChannel;
import java.nio.channels.UnsupportedAddressTypeException;
import java.nio.channels.spi.SelectorProvider;
import java.util.Collections;
import java.util.HashSet;
import java.util.Objects;
import java.util.Set;
import java.util.concurrent.locks.ReentrantLock;
import sun.net.ext.RdmaSocketOptions;
import sun.nio.ch.IOStatus;
import sun.nio.ch.IOUtil;
import sun.nio.ch.NativeThread;
import sun.nio.ch.Net;
import sun.nio.ch.SelChImpl;
import sun.nio.ch.SelectionKeyImpl;
import static java.net.StandardProtocolFamily.INET;
import static java.net.StandardProtocolFamily.INET6;
public class RdmaSocketChannelImpl
extends SocketChannel
implements SelChImpl
{
// The protocol family of the socket
private final ProtocolFamily family;
private static RdmaSocketDispatcher nd;
private final FileDescriptor fd;
private final int fdVal;
private final ReentrantLock readLock = new ReentrantLock();
private final ReentrantLock writeLock = new ReentrantLock();
private final Object stateLock = new Object();
private volatile boolean isInputClosed;
private volatile boolean isOutputClosed;
private boolean isReuseAddress;
private static final int ST_UNCONNECTED = 0;
private static final int ST_CONNECTIONPENDING = 1;
private static final int ST_CONNECTED = 2;
private static final int ST_CLOSING = 3;
private static final int ST_KILLPENDING = 4;
private static final int ST_KILLED = 5;
private volatile int state; // need stateLock to change
private long readerThread;
private long writerThread;
private InetSocketAddress localAddress;
private InetSocketAddress remoteAddress;
private Socket socket;
private static final UnsupportedOperationException unsupported;
private static final SelectorProvider checkSupported(SelectorProvider sp) {
if (unsupported != null)
throw new UnsupportedOperationException(unsupported.getMessage(),
unsupported);
else
return sp;
}
protected RdmaSocketChannelImpl(SelectorProvider sp, ProtocolFamily family)
throws IOException {
super(checkSupported(sp));
Objects.requireNonNull(family, "null family");
if (!(family == INET || family == INET6)) {
throw new UnsupportedOperationException("Protocol family not supported");
}
if (family == INET6) {
if (!Net.isIPv6Available()) {
throw new UnsupportedOperationException("IPv6 not available");
}
}
this.family = family;
this.fd = RdmaNet.socket(family, true);
IOUtil.configureBlocking(fd, false);
this.fdVal = IOUtil.fdVal(fd);
}
RdmaSocketChannelImpl(SelectorProvider sp,
FileDescriptor fd,
InetSocketAddress isa) throws IOException {
super(checkSupported(sp));
this.family = Net.isIPv6Available() ? INET6 : INET;
this.fd = fd;
this.fdVal = IOUtil.fdVal(fd);
IOUtil.configureBlocking(fd, false);
synchronized (stateLock) {
this.localAddress = RdmaNet.localAddress(fd);
this.remoteAddress = isa;
this.state = ST_CONNECTED;
}
}
private void ensureOpen() throws ClosedChannelException {
if (!isOpen())
throw new ClosedChannelException();
}
private void ensureOpenAndConnected() throws ClosedChannelException {
int state = this.state;
if (state < ST_CONNECTED) {
throw new NotYetConnectedException();
} else if (state > ST_CONNECTED) {
throw new ClosedChannelException();
}
}
@Override
public Socket socket() {
synchronized (stateLock) {
if (socket == null)
socket = RdmaSocketAdaptor.create(this);
return socket;
}
}
@Override
public SocketAddress getLocalAddress() throws IOException {
synchronized (stateLock) {
ensureOpen();
return Net.getRevealedLocalAddress(localAddress);
}
}
@Override
public SocketAddress getRemoteAddress() throws IOException {
synchronized (stateLock) {
ensureOpen();
return remoteAddress;
}
}
@Override
public <T> SocketChannel setOption(SocketOption<T> name, T value)
throws IOException {
Objects.requireNonNull(name);
if (!supportedOptions().contains(name))
throw new UnsupportedOperationException("'" + name
+ "' not supported");
synchronized (stateLock) {
ensureOpen();
RdmaNet.setSocketOption(fd, RdmaNet.UNSPEC, name, value);
return this;
}
}
@Override
@SuppressWarnings("unchecked")
public <T> T getOption(SocketOption<T> name)
throws IOException {
Objects.requireNonNull(name);
if (!supportedOptions().contains(name))
throw new UnsupportedOperationException("'" + name
+ "' not supported");
synchronized (stateLock) {
ensureOpen();
return (T) RdmaNet.getSocketOption(fd, RdmaNet.UNSPEC, name);
}
}
private static class DefaultOptionsHolder {
static final Set<SocketOption<?>> defaultOptions = defaultOptions();
private static Set<SocketOption<?>> defaultOptions() {
HashSet<SocketOption<?>> set = new HashSet<>();
set.add(StandardSocketOptions.SO_SNDBUF);
set.add(StandardSocketOptions.SO_RCVBUF);
set.add(StandardSocketOptions.SO_REUSEADDR);
set.add(StandardSocketOptions.TCP_NODELAY);
RdmaSocketOptions rdmaOptions =
RdmaSocketOptions.getInstance();
set.addAll(rdmaOptions.options());
return Collections.unmodifiableSet(set);
}
}
public Set<SocketOption<?>> supportedOptions() {
return DefaultOptionsHolder.defaultOptions;
}
private void beginRead(boolean blocking) throws ClosedChannelException {
if (blocking) {
// set hook for Thread.interrupt
begin();
synchronized (stateLock) {
ensureOpenAndConnected();
// record thread so it can be signalled if needed
readerThread = NativeThread.current();
}
} else {
ensureOpenAndConnected();
}
}
private void endRead(boolean blocking, boolean completed)
throws AsynchronousCloseException
{
if (blocking) {
synchronized (stateLock) {
readerThread = 0;
// notify any thread waiting in implCloseSelectableChannel
if (state == ST_CLOSING) {
stateLock.notifyAll();
}
}
// remove hook for Thread.interrupt
end(completed);
}
}
@Override
public int read(ByteBuffer buf) throws IOException {
Objects.requireNonNull(buf);
readLock.lock();
try {
boolean blocking = isBlocking();
int n = 0;
try {
beginRead(blocking);
// check if input is shutdown
if (isInputClosed)
return IOStatus.EOF;
n = IOUtil.read(fd, buf, -1, nd);
if (n == IOStatus.UNAVAILABLE && blocking) {
do {
RdmaNet.poll(fd, Net.POLLIN, -1);
n = IOUtil.read(fd, buf, -1, nd);
} while (n == IOStatus.UNAVAILABLE && isOpen());
}
} finally {
endRead(blocking, n > 0);
if (n <= 0 && isInputClosed)
return IOStatus.EOF;
}
return IOStatus.normalize(n);
} finally {
readLock.unlock();
}
}
@Override
public long read(ByteBuffer[] dsts, int offset, int length)
throws IOException
{
Objects.checkFromIndexSize(offset, length, dsts.length);
readLock.lock();
try {
boolean blocking = isBlocking();
long n = 0;
try {
beginRead(blocking);
// check if input is shutdown
if (isInputClosed)
return IOStatus.EOF;
n = IOUtil.read(fd, dsts, offset, length, nd);
if (n == IOStatus.UNAVAILABLE && blocking) {
do {
RdmaNet.poll(fd, Net.POLLIN, -1);
n = IOUtil.read(fd, dsts, offset, length, nd);
} while (n == IOStatus.UNAVAILABLE && isOpen());
}
} finally {
endRead(blocking, n > 0);
if (n <= 0 && isInputClosed)
return IOStatus.EOF;
}
return IOStatus.normalize(n);
} finally {
readLock.unlock();
}
}
private void beginWrite(boolean blocking) throws ClosedChannelException {
if (blocking) {
// set hook for Thread.interrupt
begin();
synchronized (stateLock) {
ensureOpenAndConnected();
if (isOutputClosed)
throw new ClosedChannelException();
// record thread so it can be signalled if needed
writerThread = NativeThread.current();
}
} else {
ensureOpenAndConnected();
}
}
private void endWrite(boolean blocking, boolean completed)
throws AsynchronousCloseException {
if (blocking) {
synchronized (stateLock) {
writerThread = 0;
// notify any thread waiting in implCloseSelectableChannel
if (state == ST_CLOSING) {
stateLock.notifyAll();
}
}
// remove hook for Thread.interrupt
end(completed);
}
}
@Override
public int write(ByteBuffer buf) throws IOException {
Objects.requireNonNull(buf);
writeLock.lock();
try {
boolean blocking = isBlocking();
int n = 0;
try {
beginWrite(blocking);
n = IOUtil.write(fd, buf, -1, nd);
if (n == IOStatus.UNAVAILABLE && blocking) {
do {
RdmaNet.poll(fd, Net.POLLOUT, -1);
n = IOUtil.write(fd, buf, -1, nd);
} while (n == IOStatus.UNAVAILABLE && isOpen());
}
} finally {
endWrite(blocking, n > 0);
if (n <= 0 && isOutputClosed)
throw new AsynchronousCloseException();
}
return IOStatus.normalize(n);
} finally {
writeLock.unlock();
}
}
@Override
public long write(ByteBuffer[] srcs, int offset, int length)
throws IOException {
Objects.checkFromIndexSize(offset, length, srcs.length);
writeLock.lock();
try {
boolean blocking = isBlocking();
long n = 0;
try {
beginWrite(blocking);
n = IOUtil.write(fd, srcs, offset, length, nd);
if (n == IOStatus.UNAVAILABLE && blocking) {
do {
RdmaNet.poll(fd, Net.POLLOUT, -1);
n = IOUtil.write(fd, srcs, offset, length, nd);
} while (n == IOStatus.UNAVAILABLE && isOpen());
}
} finally {
endWrite(blocking, n > 0);
if (n <= 0 && isOutputClosed)
throw new AsynchronousCloseException();
}
return IOStatus.normalize(n);
} finally {
writeLock.unlock();
}
}
int sendOutOfBandData(byte b) throws IOException {
writeLock.lock();
try {
boolean blocking = isBlocking();
int n = 0;
try {
beginWrite(blocking);
n = sendOutOfBandData(fd, b);
if (n == IOStatus.UNAVAILABLE && blocking) {
do {
RdmaNet.poll(fd, Net.POLLOUT, -1);
n = sendOutOfBandData(fd, b);
} while (n == IOStatus.INTERRUPTED && isOpen());
}
} finally {
endWrite(blocking, n > 0);
if (n <= 0 && isOutputClosed)
throw new AsynchronousCloseException();
}
return IOStatus.normalize(n);
} finally {
writeLock.unlock();
}
}
@Override
protected void implConfigureBlocking(boolean block) throws IOException {
readLock.lock();
try {
writeLock.lock();
try {
synchronized (stateLock) {
ensureOpen();
// do nothing
}
} finally {
writeLock.unlock();
}
} finally {
readLock.unlock();
}
}
InetSocketAddress localAddress() {
synchronized (stateLock) {
return localAddress;
}
}
InetSocketAddress remoteAddress() {
synchronized (stateLock) {
return remoteAddress;
}
}
private final InetSocketAddress anyLocalAddress() throws IOException {
if (family == INET)
return new InetSocketAddress(InetAddress.getByName("0.0.0.0"), 0);
else if (family == INET6)
return new InetSocketAddress(InetAddress.getByName("::"), 0);
else
throw new UnsupportedAddressTypeException();
}
@Override
public SocketChannel bind(SocketAddress local) throws IOException {
readLock.lock();
try {
writeLock.lock();
try {
synchronized (stateLock) {
ensureOpen();
if (state == ST_CONNECTIONPENDING)
throw new ConnectionPendingException();
if (localAddress != null)
throw new AlreadyBoundException();
InetSocketAddress isa = (local == null)
? anyLocalAddress()
: RdmaNet.checkAddress(local, family);
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
sm.checkListen(isa.getPort());
}
RdmaNet.bind(family, fd, isa.getAddress(), isa.getPort());
localAddress = RdmaNet.localAddress(fd);
}
} finally {
writeLock.unlock();
}
} finally {
readLock.unlock();
}
return this;
}
@Override
public boolean isConnected() {
return (state == ST_CONNECTED);
}
@Override
public boolean isConnectionPending() {
return (state == ST_CONNECTIONPENDING);
}
private void beginConnect(boolean blocking, InetSocketAddress isa)
throws IOException {
if (blocking) {
// set hook for Thread.interrupt
begin();
}
synchronized (stateLock) {
ensureOpen();
int state = this.state;
if (state == ST_CONNECTED)
throw new AlreadyConnectedException();
if (state == ST_CONNECTIONPENDING)
throw new ConnectionPendingException();
assert state == ST_UNCONNECTED;
this.state = ST_CONNECTIONPENDING;
remoteAddress = isa;
if (blocking) {
// record thread so it can be signalled if needed
readerThread = NativeThread.current();
}
}
}
private void endConnect(boolean blocking, boolean completed)
throws IOException {
endRead(blocking, completed);
if (completed) {
synchronized (stateLock) {
if (state == ST_CONNECTIONPENDING) {
localAddress = RdmaNet.localAddress(fd);
state = ST_CONNECTED;
}
}
}
}
@Override
public boolean connect(SocketAddress sa) throws IOException {
InetSocketAddress isa = RdmaNet.checkAddress(sa, family);
SecurityManager sm = System.getSecurityManager();
if (sm != null)
sm.checkConnect(isa.getAddress().getHostAddress(), isa.getPort());
InetAddress ia = isa.getAddress();
if (ia.isAnyLocalAddress())
ia = InetAddress.getLocalHost();
try {
readLock.lock();
try {
writeLock.lock();
try {
boolean blocking = isBlocking();
boolean connected = false;
try {
beginConnect(blocking, isa);
int n = RdmaNet.connect(family, fd, ia, isa.getPort());
if (n == IOStatus.UNAVAILABLE && blocking) {
do {
RdmaNet.poll(fd, Net.POLLOUT, -1);
n = checkConnect(fd, false);
} while (n == IOStatus.INTERRUPTED && isOpen());
}
connected = (n > 0) && isOpen();
} finally {
endConnect(blocking, connected);
}
return connected;
} finally {
writeLock.unlock();
}
} finally {
readLock.unlock();
}
} catch (IOException ioe) {
// connect failed, close the channel
close();
throw ioe;
}
}
private void beginFinishConnect(boolean blocking)
throws ClosedChannelException {
if (blocking) {
// set hook for Thread.interrupt
begin();
}
synchronized (stateLock) {
ensureOpen();
if (state != ST_CONNECTIONPENDING)
throw new NoConnectionPendingException();
if (blocking) {
// record thread so it can be signalled if needed
readerThread = NativeThread.current();
}
}
}
private void endFinishConnect(boolean blocking, boolean completed)
throws IOException
{
endRead(blocking, completed);
if (completed) {
synchronized (stateLock) {
if (state == ST_CONNECTIONPENDING) {
localAddress = RdmaNet.localAddress(fd);
state = ST_CONNECTED;
}
}
}
}
@Override
public boolean finishConnect() throws IOException {
try {
readLock.lock();
try {
writeLock.lock();
try {
// no-op if already connected
if (isConnected())
return true;
boolean blocking = isBlocking();
boolean connected = false;
try {
beginFinishConnect(blocking);
int n = checkConnect(fd, false);
if (n == IOStatus.UNAVAILABLE && blocking) {
do {
RdmaNet.poll(fd, Net.POLLOUT, -1);
n = checkConnect(fd, false);
} while (n == IOStatus.UNAVAILABLE && isOpen());
}
connected = (n > 0) && isOpen();
} finally {
endFinishConnect(blocking, connected);
}
assert (blocking && connected) ^ !blocking;
return connected;
} finally {
writeLock.unlock();
}
} finally {
readLock.unlock();
}
} catch (IOException ioe) {
// connect failed, close the channel
close();
throw ioe;
}
}
@Override
protected void implCloseSelectableChannel() throws IOException {
assert !isOpen();
boolean blocking;
boolean connected;
boolean interrupted = false;
// set state to ST_CLOSING
synchronized (stateLock) {
assert state < ST_CLOSING;
blocking = isBlocking();
connected = (state == ST_CONNECTED);
state = ST_CLOSING;
}
// wait for any outstanding I/O operations to complete
if (blocking) {
synchronized (stateLock) {
assert state == ST_CLOSING;
long reader = readerThread;
long writer = writerThread;
if (reader != 0 || writer != 0) {
nd.preClose(fd);
connected = false; // fd is no longer connected socket
if (reader != 0)
NativeThread.signal(reader);
if (writer != 0)
NativeThread.signal(writer);
// wait for blocking I/O operations to end
while (readerThread != 0 || writerThread != 0) {
try {
stateLock.wait();
} catch (InterruptedException e) {
interrupted = true;
}
}
}
}
} else {
// non-blocking mode: wait for read/write to complete
readLock.lock();
try {
writeLock.lock();
writeLock.unlock();
} finally {
readLock.unlock();
}
}
// set state to ST_KILLPENDING
synchronized (stateLock) {
assert state == ST_CLOSING;
// if connected and the channel is registered with a Selector then
// shutdown the output if possible so that the peer reads EOF.
if (connected && isRegistered()) {
try {
RdmaNet.shutdown(fd, Net.SHUT_WR);
} catch (IOException ignore) { }
}
state = ST_KILLPENDING;
}
// close socket if not registered with Selector
if (!isRegistered())
kill();
// restore interrupt status
if (interrupted)
Thread.currentThread().interrupt();
}
@Override
public void kill() throws IOException {
synchronized (stateLock) {
if (state == ST_KILLPENDING) {
state = ST_KILLED;
nd.close(fd);
}
}
}
@Override
public SocketChannel shutdownInput() throws IOException {
synchronized (stateLock) {
ensureOpen();
if (!isConnected())
throw new NotYetConnectedException();
if (!isInputClosed) {
RdmaNet.shutdown(fd, Net.SHUT_RD);
long thread = readerThread;
if (thread != 0)
NativeThread.signal(thread);
isInputClosed = true;
}
return this;
}
}
@Override
public SocketChannel shutdownOutput() throws IOException {
synchronized (stateLock) {
ensureOpen();
if (!isConnected())
throw new NotYetConnectedException();
if (!isOutputClosed) {
RdmaNet.shutdown(fd, Net.SHUT_WR);
long thread = writerThread;
if (thread != 0)
NativeThread.signal(thread);
isOutputClosed = true;
}
return this;
}
}
boolean isInputOpen() {
return !isInputClosed;
}
boolean isOutputOpen() {
return !isOutputClosed;
}
/**
* Poll this channel's socket for reading up to the given timeout.
* @return {@code true} if the socket is polled
*/
boolean pollRead(long timeout) throws IOException {
boolean blocking = isBlocking();
assert Thread.holdsLock(blockingLock()) && blocking;
readLock.lock();
try {
boolean polled = false;
try {
beginRead(blocking);
int events = RdmaNet.poll(fd, Net.POLLIN, timeout);
polled = (events != 0);
} finally {
endRead(blocking, polled);
}
return polled;
} finally {
readLock.unlock();
}
}
/**
* Poll this channel's socket for a connection, up to the given timeout.
* @return {@code true} if the socket is polled
*/
boolean pollConnected(long timeout) throws IOException {
boolean blocking = isBlocking();
assert Thread.holdsLock(blockingLock()) && blocking;
readLock.lock();
try {
writeLock.lock();
try {
boolean polled = false;
try {
beginFinishConnect(blocking);
int events = RdmaNet.poll(fd, Net.POLLCONN, timeout);
polled = (events != 0);
} finally {
// invoke endFinishConnect with completed = false so that
// the state is not changed to ST_CONNECTED. The socket
// adaptor will use finishConnect to finish.
endFinishConnect(blocking, /*completed*/false);
}
return polled;
} finally {
writeLock.unlock();
}
} finally {
readLock.unlock();
}
}
public boolean translateReadyOps(int ops, int initialOps,
SelectionKeyImpl ski) {
int intOps = ski.nioInterestOps();
int oldOps = ski.nioReadyOps();
int newOps = initialOps;
if ((ops & Net.POLLNVAL) != 0) {
return false;
}
if ((ops & (Net.POLLERR | Net.POLLHUP)) != 0) {
newOps = intOps;
ski.nioReadyOps(newOps);
return (newOps & ~oldOps) != 0;
}
boolean connected = isConnected();
if (((ops & Net.POLLIN) != 0) &&
((intOps & SelectionKey.OP_READ) != 0) && connected)
newOps |= SelectionKey.OP_READ;
if (((ops & Net.POLLCONN) != 0) &&
((intOps & SelectionKey.OP_CONNECT) != 0) && isConnectionPending())
newOps |= SelectionKey.OP_CONNECT;
if (((ops & Net.POLLOUT) != 0) &&
((intOps & SelectionKey.OP_WRITE) != 0) && connected)
newOps |= SelectionKey.OP_WRITE;
ski.nioReadyOps(newOps);
return (newOps & ~oldOps) != 0;
}
public boolean translateAndUpdateReadyOps(int ops, SelectionKeyImpl ski) {
return translateReadyOps(ops, ski.nioReadyOps(), ski);
}
public boolean translateAndSetReadyOps(int ops, SelectionKeyImpl ski) {
return translateReadyOps(ops, 0, ski);
}
public int translateInterestOps(int ops) {
int newOps = 0;
if ((ops & SelectionKey.OP_READ) != 0)
newOps |= Net.POLLIN;
if ((ops & SelectionKey.OP_WRITE) != 0)
newOps |= Net.POLLOUT;
if ((ops & SelectionKey.OP_CONNECT) != 0)
newOps |= Net.POLLCONN;
return newOps;
}
public FileDescriptor getFD() {
return fd;
}
public int getFDVal() {
return fdVal;
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append(this.getClass().getSuperclass().getName());
sb.append('[');
if (!isOpen())
sb.append("closed");
else {
synchronized (stateLock) {
switch (state) {
case ST_UNCONNECTED:
sb.append("unconnected");
break;
case ST_CONNECTIONPENDING:
sb.append("connection-pending");
break;
case ST_CONNECTED:
sb.append("connected");
if (isInputClosed)
sb.append(" ishut");
if (isOutputClosed)
sb.append(" oshut");
break;
}
InetSocketAddress addr = localAddress();
if (addr != null) {
sb.append(" local=");
sb.append(Net.getRevealedLocalAddressAsString(addr));
}
if (remoteAddress() != null) {
sb.append(" remote=");
sb.append(remoteAddress().toString());
}
}
}
sb.append(']');
return sb.toString();
}
// -- Native methods --
private static native void initIDs() throws UnsupportedOperationException;
private static native int checkConnect(FileDescriptor fd, boolean block)
throws IOException;
private static native int sendOutOfBandData(FileDescriptor fd, byte data)
throws IOException;
static {
IOUtil.load();
System.loadLibrary("extnet");
UnsupportedOperationException uoe = null;
try {
initIDs();
} catch (UnsupportedOperationException e) {
uoe = e;
}
unsupported = uoe;
nd = new RdmaSocketDispatcher();
}
}