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| 1 | /* | ||
| 2 | * Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved. | ||
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| 4 | * | ||
| 5 | * This code is free software; you can redistribute it and/or modify it | ||
| 6 | * under the terms of the GNU General Public License version 2 only, as | ||
| 7 | * published by the Free Software Foundation. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | package sun.nio.ch; | ||
| 27 | |||
| 28 | import java.io.FileDescriptor; | ||
| 29 | import java.io.IOException; | ||
| 30 | import java.net.*; | ||
| 31 | import java.nio.channels.*; | ||
| 32 | import java.nio.channels.spi.*; | ||
| 33 | import java.util.*; | ||
| 34 | import sun.net.NetHooks; | ||
| 35 | |||
| 36 | |||
| 37 | /** | ||
| 38 | * An implementation of ServerSocketChannels | ||
| 39 | */ | ||
| 40 | |||
| 41 | class ServerSocketChannelImpl | ||
| 42 | extends ServerSocketChannel | ||
| 43 | implements SelChImpl | ||
| 44 | { | ||
| 45 | |||
| 46 | // Used to make native close and configure calls | ||
| 47 | private static NativeDispatcher nd; | ||
| 48 | |||
| 49 | // Our file descriptor | ||
| 50 | private final FileDescriptor fd; | ||
| 51 | |||
| 52 | // fd value needed for dev/poll. This value will remain valid | ||
| 53 | // even after the value in the file descriptor object has been set to -1 | ||
| 54 | private int fdVal; | ||
| 55 | |||
| 56 | // ID of native thread currently blocked in this channel, for signalling | ||
| 57 | private volatile long thread = 0; | ||
| 58 | |||
| 59 | // Lock held by thread currently blocked in this channel | ||
| 60 | private final Object lock = new Object(); | ||
| 61 | |||
| 62 | // Lock held by any thread that modifies the state fields declared below | ||
| 63 | // DO NOT invoke a blocking I/O operation while holding this lock! | ||
| 64 | private final Object stateLock = new Object(); | ||
| 65 | |||
| 66 | // -- The following fields are protected by stateLock | ||
| 67 | |||
| 68 | // Channel state, increases monotonically | ||
| 69 | private static final int ST_UNINITIALIZED = -1; | ||
| 70 | private static final int ST_INUSE = 0; | ||
| 71 | private static final int ST_KILLED = 1; | ||
| 72 | private int state = ST_UNINITIALIZED; | ||
| 73 | |||
| 74 | // Binding | ||
| 75 | private SocketAddress localAddress; // null => unbound | ||
| 76 | |||
| 77 | // Our socket adaptor, if any | ||
| 78 | ServerSocket socket; | ||
| 79 | |||
| 80 | // -- End of fields protected by stateLock | ||
| 81 | |||
| 82 | |||
| 83 | ServerSocketChannelImpl(SelectorProvider sp) throws IOException { | ||
| 84 | super(sp); | ||
| 85 | this.fd = Net.serverSocket(true); | ||
| 86 | this.fdVal = IOUtil.fdVal(fd); | ||
| 87 | this.state = ST_INUSE; | ||
| 88 | } | ||
| 89 | |||
| 90 | ServerSocketChannelImpl(SelectorProvider sp, | ||
| 91 | FileDescriptor fd, | ||
| 92 | boolean bound) | ||
| 93 | throws IOException | ||
| 94 | { | ||
| 95 | super(sp); | ||
| 96 | this.fd = fd; | ||
| 97 | this.fdVal = IOUtil.fdVal(fd); | ||
| 98 | this.state = ST_INUSE; | ||
| 99 | if (bound) | ||
| 100 | localAddress = Net.localAddress(fd); | ||
| 101 | } | ||
| 102 | |||
| 103 | public ServerSocket socket() { | ||
| 104 | synchronized (stateLock) { | ||
| 105 | if (socket == null) | ||
| 106 | socket = ServerSocketAdaptor.create(this); | ||
| 107 | return socket; | ||
| 108 | } | ||
| 109 | } | ||
| 110 | |||
| 111 | @Override | ||
| 112 | public SocketAddress getLocalAddress() throws IOException { | ||
| 113 | synchronized (stateLock) { | ||
| 114 | if (!isOpen()) | ||
| 115 | throw new ClosedChannelException(); | ||
| 116 | return localAddress; | ||
| 117 | } | ||
| 118 | } | ||
| 119 | |||
| 120 | @Override | ||
| 121 | public <T> ServerSocketChannel setOption(SocketOption<T> name, T value) | ||
| 122 | throws IOException | ||
| 123 | { | ||
| 124 | if (name == null) | ||
| 125 | throw new NullPointerException(); | ||
| 126 | if (!supportedOptions().contains(name)) | ||
| 127 | throw new UnsupportedOperationException("'" + name + "' not supported"); | ||
| 128 | |||
| 129 | synchronized (stateLock) { | ||
| 130 | if (!isOpen()) | ||
| 131 | throw new ClosedChannelException(); | ||
| 132 | |||
| 133 | // no options that require special handling | ||
| 134 | Net.setSocketOption(fd, Net.UNSPEC, name, value); | ||
| 135 | return this; | ||
| 136 | } | ||
| 137 | } | ||
| 138 | |||
| 139 | @Override | ||
| 140 | @SuppressWarnings("unchecked") | ||
| 141 | public <T> T getOption(SocketOption<T> name) | ||
| 142 | throws IOException | ||
| 143 | { | ||
| 144 | if (name == null) | ||
| 145 | throw new NullPointerException(); | ||
| 146 | if (!supportedOptions().contains(name)) | ||
| 147 | throw new UnsupportedOperationException("'" + name + "' not supported"); | ||
| 148 | |||
| 149 | synchronized (stateLock) { | ||
| 150 | if (!isOpen()) | ||
| 151 | throw new ClosedChannelException(); | ||
| 152 | |||
| 153 | // no options that require special handling | ||
| 154 | return (T) Net.getSocketOption(fd, Net.UNSPEC, name); | ||
| 155 | } | ||
| 156 | } | ||
| 157 | |||
| 158 | private static class DefaultOptionsHolder { | ||
| 159 | static final Set<SocketOption<?>> defaultOptions = defaultOptions(); | ||
| 160 | |||
| 161 | private static Set<SocketOption<?>> defaultOptions() { | ||
| 162 | HashSet<SocketOption<?>> set = new HashSet<SocketOption<?>>(2); | ||
| 163 | set.add(StandardSocketOptions.SO_RCVBUF); | ||
| 164 | set.add(StandardSocketOptions.SO_REUSEADDR); | ||
| 165 | return Collections.unmodifiableSet(set); | ||
| 166 | } | ||
| 167 | } | ||
| 168 | |||
| 169 | @Override | ||
| 170 | public final Set<SocketOption<?>> supportedOptions() { | ||
| 171 | return DefaultOptionsHolder.defaultOptions; | ||
| 172 | } | ||
| 173 | |||
| 174 | public boolean isBound() { | ||
| 175 | synchronized (stateLock) { | ||
| 176 | return localAddress != null; | ||
| 177 | } | ||
| 178 | } | ||
| 179 | |||
| 180 | public SocketAddress localAddress() { | ||
| 181 | synchronized (stateLock) { | ||
| 182 | return localAddress; | ||
| 183 | } | ||
| 184 | } | ||
| 185 | |||
| 186 | @Override | ||
| 187 | public ServerSocketChannel bind(SocketAddress local, int backlog) throws IOException { | ||
| 188 | synchronized (lock) { | ||
| 189 | if (!isOpen()) | ||
| 190 | throw new ClosedChannelException(); | ||
| 191 | if (isBound()) | ||
| 192 | throw new AlreadyBoundException(); | ||
| 193 | InetSocketAddress isa = (local == null) ? new InetSocketAddress(0) : | ||
| 194 | Net.checkAddress(local); | ||
| 195 | SecurityManager sm = System.getSecurityManager(); | ||
| 196 | if (sm != null) | ||
| 197 | sm.checkListen(isa.getPort()); | ||
| 198 | NetHooks.beforeTcpBind(fd, isa.getAddress(), isa.getPort()); | ||
| 199 | Net.bind(fd, isa.getAddress(), isa.getPort()); | ||
| 200 | Net.listen(fd, backlog < 1 ? 50 : backlog); | ||
| 201 | synchronized (stateLock) { | ||
| 202 | localAddress = Net.localAddress(fd); | ||
| 203 | } | ||
| 204 | } | ||
| 205 | return this; | ||
| 206 | } | ||
| 207 | |||
| 208 | public SocketChannel accept() throws IOException { | ||
| 209 | synchronized (lock) { | ||
| 210 | if (!isOpen()) | ||
| 211 | throw new ClosedChannelException(); | ||
| 212 | if (!isBound()) | ||
| 213 | throw new NotYetBoundException(); | ||
| 214 | SocketChannel sc = null; | ||
| 215 | |||
| 216 | int n = 0; | ||
| 217 | FileDescriptor newfd = new FileDescriptor(); | ||
| 218 | InetSocketAddress[] isaa = new InetSocketAddress[1]; | ||
| 219 | |||
| 220 | try { | ||
| 221 | begin(); | ||
| 222 | if (!isOpen()) | ||
| 223 | return null; | ||
| 224 | thread = NativeThread.current(); | ||
| 225 | for (;;) { | ||
| 226 | n = accept0(this.fd, newfd, isaa); | ||
| 227 | if ((n == IOStatus.INTERRUPTED) && isOpen()) | ||
| 228 | continue; | ||
| 229 | break; | ||
| 230 | } | ||
| 231 | } finally { | ||
| 232 | thread = 0; | ||
| 233 | end(n > 0); | ||
| 234 | assert IOStatus.check(n); | ||
| 235 | } | ||
| 236 | |||
| 237 | if (n < 1) | ||
| 238 | return null; | ||
| 239 | |||
| 240 | IOUtil.configureBlocking(newfd, true); | ||
| 241 | InetSocketAddress isa = isaa[0]; | ||
| 242 | sc = new SocketChannelImpl(provider(), newfd, isa); | ||
| 243 | SecurityManager sm = System.getSecurityManager(); | ||
| 244 | if (sm != null) { | ||
| 245 | try { | ||
| 246 | sm.checkAccept(isa.getAddress().getHostAddress(), | ||
| 247 | isa.getPort()); | ||
| 248 | } catch (SecurityException x) { | ||
| 249 | sc.close(); | ||
| 250 | throw x; | ||
| 251 | } | ||
| 252 | } | ||
| 253 | return sc; | ||
| 254 | |||
| 255 | } | ||
| 256 | } | ||
| 257 | |||
| 258 | protected void implConfigureBlocking(boolean block) throws IOException { | ||
| 259 | IOUtil.configureBlocking(fd, block); | ||
| 260 | } | ||
| 261 | |||
| 262 | protected void implCloseSelectableChannel() throws IOException { | ||
| 263 | synchronized (stateLock) { | ||
| 264 | nd.preClose(fd); | ||
| 265 | long th = thread; | ||
| 266 | if (th != 0) | ||
| 267 | NativeThread.signal(th); | ||
| 268 | if (!isRegistered()) | ||
| 269 | kill(); | ||
| 270 | } | ||
| 271 | } | ||
| 272 | |||
| 273 | public void kill() throws IOException { | ||
| 274 | synchronized (stateLock) { | ||
| 275 | if (state == ST_KILLED) | ||
| 276 | return; | ||
| 277 | if (state == ST_UNINITIALIZED) { | ||
| 278 | state = ST_KILLED; | ||
| 279 | return; | ||
| 280 | } | ||
| 281 | assert !isOpen() && !isRegistered(); | ||
| 282 | nd.close(fd); | ||
| 283 | state = ST_KILLED; | ||
| 284 | } | ||
| 285 | } | ||
| 286 | |||
| 287 | /** | ||
| 288 | * Translates native poll revent set into a ready operation set | ||
| 289 | */ | ||
| 290 | public boolean translateReadyOps(int ops, int initialOps, | ||
| 291 | SelectionKeyImpl sk) { | ||
| 292 | int intOps = sk.nioInterestOps(); // Do this just once, it synchronizes | ||
| 293 | int oldOps = sk.nioReadyOps(); | ||
| 294 | int newOps = initialOps; | ||
| 295 | |||
| 296 | if ((ops & PollArrayWrapper.POLLNVAL) != 0) { | ||
| 297 | // This should only happen if this channel is pre-closed while a | ||
| 298 | // selection operation is in progress | ||
| 299 | // ## Throw an error if this channel has not been pre-closed | ||
| 300 | return false; | ||
| 301 | } | ||
| 302 | |||
| 303 | if ((ops & (PollArrayWrapper.POLLERR | ||
| 304 | | PollArrayWrapper.POLLHUP)) != 0) { | ||
| 305 | newOps = intOps; | ||
| 306 | sk.nioReadyOps(newOps); | ||
| 307 | return (newOps & ~oldOps) != 0; | ||
| 308 | } | ||
| 309 | |||
| 310 | if (((ops & PollArrayWrapper.POLLIN) != 0) && | ||
| 311 | ((intOps & SelectionKey.OP_ACCEPT) != 0)) | ||
| 312 | newOps |= SelectionKey.OP_ACCEPT; | ||
| 313 | |||
| 314 | sk.nioReadyOps(newOps); | ||
| 315 | return (newOps & ~oldOps) != 0; | ||
| 316 | } | ||
| 317 | |||
| 318 | public boolean translateAndUpdateReadyOps(int ops, SelectionKeyImpl sk) { | ||
| 319 | return translateReadyOps(ops, sk.nioReadyOps(), sk); | ||
| 320 | } | ||
| 321 | |||
| 322 | public boolean translateAndSetReadyOps(int ops, SelectionKeyImpl sk) { | ||
| 323 | return translateReadyOps(ops, 0, sk); | ||
| 324 | } | ||
| 325 | |||
| 326 | /** | ||
| 327 | * Translates an interest operation set into a native poll event set | ||
| 328 | */ | ||
| 329 | public void translateAndSetInterestOps(int ops, SelectionKeyImpl sk) { | ||
| 330 | int newOps = 0; | ||
| 331 | |||
| 332 | // Translate ops | ||
| 333 | if ((ops & SelectionKey.OP_ACCEPT) != 0) | ||
| 334 | newOps |= PollArrayWrapper.POLLIN; | ||
| 335 | // Place ops into pollfd array | ||
| 336 | sk.selector.putEventOps(sk, newOps); | ||
| 337 | } | ||
| 338 | |||
| 339 | public FileDescriptor getFD() { | ||
| 340 | return fd; | ||
| 341 | } | ||
| 342 | |||
| 343 | public int getFDVal() { | ||
| 344 | return fdVal; | ||
| 345 | } | ||
| 346 | |||
| 347 | public String toString() { | ||
| 348 | StringBuffer sb = new StringBuffer(); | ||
| 349 | sb.append(this.getClass().getName()); | ||
| 350 | sb.append('['); | ||
| 351 | if (!isOpen()) | ||
| 352 | sb.append("closed"); | ||
| 353 | else { | ||
| 354 | synchronized (stateLock) { | ||
| 355 | if (localAddress() == null) { | ||
| 356 | sb.append("unbound"); | ||
| 357 | } else { | ||
| 358 | sb.append(localAddress().toString()); | ||
| 359 | } | ||
| 360 | } | ||
| 361 | } | ||
| 362 | sb.append(']'); | ||
| 363 | return sb.toString(); | ||
| 364 | } | ||
| 365 | |||
| 366 | // -- Native methods -- | ||
| 367 | |||
| 368 | // Accepts a new connection, setting the given file descriptor to refer to | ||
| 369 | // the new socket and setting isaa[0] to the socket's remote address. | ||
| 370 | // Returns 1 on success, or IOStatus.UNAVAILABLE (if non-blocking and no | ||
| 371 | // connections are pending) or IOStatus.INTERRUPTED. | ||
| 372 | // | ||
| 373 | private native int accept0(FileDescriptor ssfd, FileDescriptor newfd, | ||
| 374 | InetSocketAddress[] isaa) | ||
| 375 | throws IOException; | ||
| 376 | |||
| 377 | private static native void initIDs(); | ||
| 378 | |||
| 379 | static { | ||
| 380 | Util.load(); | ||
| 381 | initIDs(); | ||
| 382 | nd = new SocketDispatcher(); | ||
| 383 | } | ||
| 384 | |||
| 385 | } | ||