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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.ByteBuffer; | ||
| 32 | import java.nio.channels.*; | ||
| 33 | import java.nio.channels.spi.*; | ||
| 34 | import java.util.*; | ||
| 35 | import sun.net.NetHooks; | ||
| 36 | |||
| 37 | |||
| 38 | /** | ||
| 39 | * An implementation of SocketChannels | ||
| 40 | */ | ||
| 41 | |||
| 42 | class SocketChannelImpl | ||
| 43 | extends SocketChannel | ||
| 44 | implements SelChImpl | ||
| 45 | { | ||
| 46 | |||
| 47 | // Used to make native read and write calls | ||
| 48 | private static NativeDispatcher nd; | ||
| 49 | |||
| 50 | // Our file descriptor object | ||
| 51 | private final FileDescriptor fd; | ||
| 52 | |||
| 53 | // fd value needed for dev/poll. This value will remain valid | ||
| 54 | // even after the value in the file descriptor object has been set to -1 | ||
| 55 | private final int fdVal; | ||
| 56 | |||
| 57 | // IDs of native threads doing reads and writes, for signalling | ||
| 58 | private volatile long readerThread = 0; | ||
| 59 | private volatile long writerThread = 0; | ||
| 60 | |||
| 61 | // Lock held by current reading or connecting thread | ||
| 62 | private final Object readLock = new Object(); | ||
| 63 | |||
| 64 | // Lock held by current writing or connecting thread | ||
| 65 | private final Object writeLock = new Object(); | ||
| 66 | |||
| 67 | // Lock held by any thread that modifies the state fields declared below | ||
| 68 | // DO NOT invoke a blocking I/O operation while holding this lock! | ||
| 69 | private final Object stateLock = new Object(); | ||
| 70 | |||
| 71 | // -- The following fields are protected by stateLock | ||
| 72 | |||
| 73 | // State, increases monotonically | ||
| 74 | private static final int ST_UNINITIALIZED = -1; | ||
| 75 | private static final int ST_UNCONNECTED = 0; | ||
| 76 | private static final int ST_PENDING = 1; | ||
| 77 | private static final int ST_CONNECTED = 2; | ||
| 78 | private static final int ST_KILLPENDING = 3; | ||
| 79 | private static final int ST_KILLED = 4; | ||
| 80 | private int state = ST_UNINITIALIZED; | ||
| 81 | |||
| 82 | // Binding | ||
| 83 | private SocketAddress localAddress; | ||
| 84 | private SocketAddress remoteAddress; | ||
| 85 | |||
| 86 | // Input/Output open | ||
| 87 | private boolean isInputOpen = true; | ||
| 88 | private boolean isOutputOpen = true; | ||
| 89 | private boolean readyToConnect = false; | ||
| 90 | |||
| 91 | // Socket adaptor, created on demand | ||
| 92 | private Socket socket; | ||
| 93 | |||
| 94 | // -- End of fields protected by stateLock | ||
| 95 | |||
| 96 | |||
| 97 | // Constructor for normal connecting sockets | ||
| 98 | // | ||
| 99 | SocketChannelImpl(SelectorProvider sp) throws IOException { | ||
| 100 | super(sp); | ||
| 101 | this.fd = Net.socket(true); | ||
| 102 | this.fdVal = IOUtil.fdVal(fd); | ||
| 103 | this.state = ST_UNCONNECTED; | ||
| 104 | } | ||
| 105 | |||
| 106 | SocketChannelImpl(SelectorProvider sp, | ||
| 107 | FileDescriptor fd, | ||
| 108 | boolean bound) | ||
| 109 | throws IOException | ||
| 110 | { | ||
| 111 | super(sp); | ||
| 112 | this.fd = fd; | ||
| 113 | this.fdVal = IOUtil.fdVal(fd); | ||
| 114 | this.state = ST_UNCONNECTED; | ||
| 115 | if (bound) | ||
| 116 | this.localAddress = Net.localAddress(fd); | ||
| 117 | } | ||
| 118 | |||
| 119 | // Constructor for sockets obtained from server sockets | ||
| 120 | // | ||
| 121 | SocketChannelImpl(SelectorProvider sp, | ||
| 122 | FileDescriptor fd, InetSocketAddress remote) | ||
| 123 | throws IOException | ||
| 124 | { | ||
| 125 | super(sp); | ||
| 126 | this.fd = fd; | ||
| 127 | this.fdVal = IOUtil.fdVal(fd); | ||
| 128 | this.state = ST_CONNECTED; | ||
| 129 | this.localAddress = Net.localAddress(fd); | ||
| 130 | this.remoteAddress = remote; | ||
| 131 | } | ||
| 132 | |||
| 133 | public Socket socket() { | ||
| 134 | synchronized (stateLock) { | ||
| 135 | if (socket == null) | ||
| 136 | socket = SocketAdaptor.create(this); | ||
| 137 | return socket; | ||
| 138 | } | ||
| 139 | } | ||
| 140 | |||
| 141 | @Override | ||
| 142 | public SocketAddress getLocalAddress() throws IOException { | ||
| 143 | synchronized (stateLock) { | ||
| 144 | if (!isOpen()) | ||
| 145 | throw new ClosedChannelException(); | ||
| 146 | return localAddress; | ||
| 147 | } | ||
| 148 | } | ||
| 149 | |||
| 150 | @Override | ||
| 151 | public SocketAddress getRemoteAddress() throws IOException { | ||
| 152 | synchronized (stateLock) { | ||
| 153 | if (!isOpen()) | ||
| 154 | throw new ClosedChannelException(); | ||
| 155 | return remoteAddress; | ||
| 156 | } | ||
| 157 | } | ||
| 158 | |||
| 159 | @Override | ||
| 160 | public <T> SocketChannel setOption(SocketOption<T> name, T value) | ||
| 161 | throws IOException | ||
| 162 | { | ||
| 163 | if (name == null) | ||
| 164 | throw new NullPointerException(); | ||
| 165 | if (!supportedOptions().contains(name)) | ||
| 166 | throw new UnsupportedOperationException("'" + name + "' not supported"); | ||
| 167 | |||
| 168 | synchronized (stateLock) { | ||
| 169 | if (!isOpen()) | ||
| 170 | throw new ClosedChannelException(); | ||
| 171 | |||
| 172 | // special handling for IP_TOS: no-op when IPv6 | ||
| 173 | if (name == StandardSocketOptions.IP_TOS) { | ||
| 174 | if (!Net.isIPv6Available()) | ||
| 175 | Net.setSocketOption(fd, StandardProtocolFamily.INET, name, value); | ||
| 176 | return this; | ||
| 177 | } | ||
| 178 | |||
| 179 | // no options that require special handling | ||
| 180 | Net.setSocketOption(fd, Net.UNSPEC, name, value); | ||
| 181 | return this; | ||
| 182 | } | ||
| 183 | } | ||
| 184 | |||
| 185 | @Override | ||
| 186 | @SuppressWarnings("unchecked") | ||
| 187 | public <T> T getOption(SocketOption<T> name) | ||
| 188 | throws IOException | ||
| 189 | { | ||
| 190 | if (name == null) | ||
| 191 | throw new NullPointerException(); | ||
| 192 | if (!supportedOptions().contains(name)) | ||
| 193 | throw new UnsupportedOperationException("'" + name + "' not supported"); | ||
| 194 | |||
| 195 | synchronized (stateLock) { | ||
| 196 | if (!isOpen()) | ||
| 197 | throw new ClosedChannelException(); | ||
| 198 | |||
| 199 | // special handling for IP_TOS: always return 0 when IPv6 | ||
| 200 | if (name == StandardSocketOptions.IP_TOS) { | ||
| 201 | return (Net.isIPv6Available()) ? (T) Integer.valueOf(0) : | ||
| 202 | (T) Net.getSocketOption(fd, StandardProtocolFamily.INET, name); | ||
| 203 | } | ||
| 204 | |||
| 205 | // no options that require special handling | ||
| 206 | return (T) Net.getSocketOption(fd, Net.UNSPEC, name); | ||
| 207 | } | ||
| 208 | } | ||
| 209 | |||
| 210 | private static class DefaultOptionsHolder { | ||
| 211 | static final Set<SocketOption<?>> defaultOptions = defaultOptions(); | ||
| 212 | |||
| 213 | private static Set<SocketOption<?>> defaultOptions() { | ||
| 214 | HashSet<SocketOption<?>> set = new HashSet<SocketOption<?>>(8); | ||
| 215 | set.add(StandardSocketOptions.SO_SNDBUF); | ||
| 216 | set.add(StandardSocketOptions.SO_RCVBUF); | ||
| 217 | set.add(StandardSocketOptions.SO_KEEPALIVE); | ||
| 218 | set.add(StandardSocketOptions.SO_REUSEADDR); | ||
| 219 | set.add(StandardSocketOptions.SO_LINGER); | ||
| 220 | set.add(StandardSocketOptions.TCP_NODELAY); | ||
| 221 | // additional options required by socket adaptor | ||
| 222 | set.add(StandardSocketOptions.IP_TOS); | ||
| 223 | set.add(ExtendedSocketOption.SO_OOBINLINE); | ||
| 224 | return Collections.unmodifiableSet(set); | ||
| 225 | } | ||
| 226 | } | ||
| 227 | |||
| 228 | @Override | ||
| 229 | public final Set<SocketOption<?>> supportedOptions() { | ||
| 230 | return DefaultOptionsHolder.defaultOptions; | ||
| 231 | } | ||
| 232 | |||
| 233 | private boolean ensureReadOpen() throws ClosedChannelException { | ||
| 234 | synchronized (stateLock) { | ||
| 235 | if (!isOpen()) | ||
| 236 | throw new ClosedChannelException(); | ||
| 237 | if (!isConnected()) | ||
| 238 | throw new NotYetConnectedException(); | ||
| 239 | if (!isInputOpen) | ||
| 240 | return false; | ||
| 241 | else | ||
| 242 | return true; | ||
| 243 | } | ||
| 244 | } | ||
| 245 | |||
| 246 | private void ensureWriteOpen() throws ClosedChannelException { | ||
| 247 | synchronized (stateLock) { | ||
| 248 | if (!isOpen()) | ||
| 249 | throw new ClosedChannelException(); | ||
| 250 | if (!isOutputOpen) | ||
| 251 | throw new ClosedChannelException(); | ||
| 252 | if (!isConnected()) | ||
| 253 | throw new NotYetConnectedException(); | ||
| 254 | } | ||
| 255 | } | ||
| 256 | |||
| 257 | private void readerCleanup() throws IOException { | ||
| 258 | synchronized (stateLock) { | ||
| 259 | readerThread = 0; | ||
| 260 | if (state == ST_KILLPENDING) | ||
| 261 | kill(); | ||
| 262 | } | ||
| 263 | } | ||
| 264 | |||
| 265 | private void writerCleanup() throws IOException { | ||
| 266 | synchronized (stateLock) { | ||
| 267 | writerThread = 0; | ||
| 268 | if (state == ST_KILLPENDING) | ||
| 269 | kill(); | ||
| 270 | } | ||
| 271 | } | ||
| 272 | |||
| 273 | public int read(ByteBuffer buf) throws IOException { | ||
| 274 | |||
| 275 | if (buf == null) | ||
| 276 | throw new NullPointerException(); | ||
| 277 | |||
| 278 | synchronized (readLock) { | ||
| 279 | if (!ensureReadOpen()) | ||
| 280 | return -1; | ||
| 281 | int n = 0; | ||
| 282 | try { | ||
| 283 | |||
| 284 | // Set up the interruption machinery; see | ||
| 285 | // AbstractInterruptibleChannel for details | ||
| 286 | // | ||
| 287 | begin(); | ||
| 288 | |||
| 289 | synchronized (stateLock) { | ||
| 290 | if (!isOpen()) { | ||
| 291 | // Either the current thread is already interrupted, so | ||
| 292 | // begin() closed the channel, or another thread closed the | ||
| 293 | // channel since we checked it a few bytecodes ago. In | ||
| 294 | // either case the value returned here is irrelevant since | ||
| 295 | // the invocation of end() in the finally block will throw | ||
| 296 | // an appropriate exception. | ||
| 297 | // | ||
| 298 | return 0; | ||
| 299 | |||
| 300 | } | ||
| 301 | |||
| 302 | // Save this thread so that it can be signalled on those | ||
| 303 | // platforms that require it | ||
| 304 | // | ||
| 305 | readerThread = NativeThread.current(); | ||
| 306 | } | ||
| 307 | |||
| 308 | // Between the previous test of isOpen() and the return of the | ||
| 309 | // IOUtil.read invocation below, this channel might be closed | ||
| 310 | // or this thread might be interrupted. We rely upon the | ||
| 311 | // implicit synchronization point in the kernel read() call to | ||
| 312 | // make sure that the right thing happens. In either case the | ||
| 313 | // implCloseSelectableChannel method is ultimately invoked in | ||
| 314 | // some other thread, so there are three possibilities: | ||
| 315 | // | ||
| 316 | // - implCloseSelectableChannel() invokes nd.preClose() | ||
| 317 | // before this thread invokes read(), in which case the | ||
| 318 | // read returns immediately with either EOF or an error, | ||
| 319 | // the latter of which will cause an IOException to be | ||
| 320 | // thrown. | ||
| 321 | // | ||
| 322 | // - implCloseSelectableChannel() invokes nd.preClose() after | ||
| 323 | // this thread is blocked in read(). On some operating | ||
| 324 | // systems (e.g., Solaris and Windows) this causes the read | ||
| 325 | // to return immediately with either EOF or an error | ||
| 326 | // indication. | ||
| 327 | // | ||
| 328 | // - implCloseSelectableChannel() invokes nd.preClose() after | ||
| 329 | // this thread is blocked in read() but the operating | ||
| 330 | // system (e.g., Linux) doesn't support preemptive close, | ||
| 331 | // so implCloseSelectableChannel() proceeds to signal this | ||
| 332 | // thread, thereby causing the read to return immediately | ||
| 333 | // with IOStatus.INTERRUPTED. | ||
| 334 | // | ||
| 335 | // In all three cases the invocation of end() in the finally | ||
| 336 | // clause will notice that the channel has been closed and | ||
| 337 | // throw an appropriate exception (AsynchronousCloseException | ||
| 338 | // or ClosedByInterruptException) if necessary. | ||
| 339 | // | ||
| 340 | // *There is A fourth possibility. implCloseSelectableChannel() | ||
| 341 | // invokes nd.preClose(), signals reader/writer thred and quickly | ||
| 342 | // moves on to nd.close() in kill(), which does a real close. | ||
| 343 | // Then a third thread accepts a new connection, opens file or | ||
| 344 | // whatever that causes the released "fd" to be recycled. All | ||
| 345 | // above happens just between our last isOpen() check and the | ||
| 346 | // next kernel read reached, with the recycled "fd". The solution | ||
| 347 | // is to postpone the real kill() if there is a reader or/and | ||
| 348 | // writer thread(s) over there "waiting", leave the cleanup/kill | ||
| 349 | // to the reader or writer thread. (the preClose() still happens | ||
| 350 | // so the connection gets cut off as usual). | ||
| 351 | // | ||
| 352 | // For socket channels there is the additional wrinkle that | ||
| 353 | // asynchronous shutdown works much like asynchronous close, | ||
| 354 | // except that the channel is shutdown rather than completely | ||
| 355 | // closed. This is analogous to the first two cases above, | ||
| 356 | // except that the shutdown operation plays the role of | ||
| 357 | // nd.preClose(). | ||
| 358 | for (;;) { | ||
| 359 | n = IOUtil.read(fd, buf, -1, nd, readLock); | ||
| 360 | if ((n == IOStatus.INTERRUPTED) && isOpen()) { | ||
| 361 | // The system call was interrupted but the channel | ||
| 362 | // is still open, so retry | ||
| 363 | continue; | ||
| 364 | } | ||
| 365 | return IOStatus.normalize(n); | ||
| 366 | } | ||
| 367 | |||
| 368 | } finally { | ||
| 369 | readerCleanup(); // Clear reader thread | ||
| 370 | // The end method, which is defined in our superclass | ||
| 371 | // AbstractInterruptibleChannel, resets the interruption | ||
| 372 | // machinery. If its argument is true then it returns | ||
| 373 | // normally; otherwise it checks the interrupt and open state | ||
| 374 | // of this channel and throws an appropriate exception if | ||
| 375 | // necessary. | ||
| 376 | // | ||
| 377 | // So, if we actually managed to do any I/O in the above try | ||
| 378 | // block then we pass true to the end method. We also pass | ||
| 379 | // true if the channel was in non-blocking mode when the I/O | ||
| 380 | // operation was initiated but no data could be transferred; | ||
| 381 | // this prevents spurious exceptions from being thrown in the | ||
| 382 | // rare event that a channel is closed or a thread is | ||
| 383 | // interrupted at the exact moment that a non-blocking I/O | ||
| 384 | // request is made. | ||
| 385 | // | ||
| 386 | end(n > 0 || (n == IOStatus.UNAVAILABLE)); | ||
| 387 | |||
| 388 | // Extra case for socket channels: Asynchronous shutdown | ||
| 389 | // | ||
| 390 | synchronized (stateLock) { | ||
| 391 | if ((n <= 0) && (!isInputOpen)) | ||
| 392 | return IOStatus.EOF; | ||
| 393 | } | ||
| 394 | |||
| 395 | assert IOStatus.check(n); | ||
| 396 | |||
| 397 | } | ||
| 398 | } | ||
| 399 | } | ||
| 400 | |||
| 401 | public long read(ByteBuffer[] dsts, int offset, int length) | ||
| 402 | throws IOException | ||
| 403 | { | ||
| 404 | if ((offset < 0) || (length < 0) || (offset > dsts.length - length)) | ||
| 405 | throw new IndexOutOfBoundsException(); | ||
| 406 | synchronized (readLock) { | ||
| 407 | if (!ensureReadOpen()) | ||
| 408 | return -1; | ||
| 409 | long n = 0; | ||
| 410 | try { | ||
| 411 | begin(); | ||
| 412 | synchronized (stateLock) { | ||
| 413 | if (!isOpen()) | ||
| 414 | return 0; | ||
| 415 | readerThread = NativeThread.current(); | ||
| 416 | } | ||
| 417 | |||
| 418 | for (;;) { | ||
| 419 | n = IOUtil.read(fd, dsts, offset, length, nd); | ||
| 420 | if ((n == IOStatus.INTERRUPTED) && isOpen()) | ||
| 421 | continue; | ||
| 422 | return IOStatus.normalize(n); | ||
| 423 | } | ||
| 424 | } finally { | ||
| 425 | readerCleanup(); | ||
| 426 | end(n > 0 || (n == IOStatus.UNAVAILABLE)); | ||
| 427 | synchronized (stateLock) { | ||
| 428 | if ((n <= 0) && (!isInputOpen)) | ||
| 429 | return IOStatus.EOF; | ||
| 430 | } | ||
| 431 | assert IOStatus.check(n); | ||
| 432 | } | ||
| 433 | } | ||
| 434 | } | ||
| 435 | |||
| 436 | public int write(ByteBuffer buf) throws IOException { | ||
| 437 | if (buf == null) | ||
| 438 | throw new NullPointerException(); | ||
| 439 | synchronized (writeLock) { | ||
| 440 | ensureWriteOpen(); | ||
| 441 | int n = 0; | ||
| 442 | try { | ||
| 443 | begin(); | ||
| 444 | synchronized (stateLock) { | ||
| 445 | if (!isOpen()) | ||
| 446 | return 0; | ||
| 447 | writerThread = NativeThread.current(); | ||
| 448 | } | ||
| 449 | for (;;) { | ||
| 450 | n = IOUtil.write(fd, buf, -1, nd, writeLock); | ||
| 451 | if ((n == IOStatus.INTERRUPTED) && isOpen()) | ||
| 452 | continue; | ||
| 453 | return IOStatus.normalize(n); | ||
| 454 | } | ||
| 455 | } finally { | ||
| 456 | writerCleanup(); | ||
| 457 | end(n > 0 || (n == IOStatus.UNAVAILABLE)); | ||
| 458 | synchronized (stateLock) { | ||
| 459 | if ((n <= 0) && (!isOutputOpen)) | ||
| 460 | throw new AsynchronousCloseException(); | ||
| 461 | } | ||
| 462 | assert IOStatus.check(n); | ||
| 463 | } | ||
| 464 | } | ||
| 465 | } | ||
| 466 | |||
| 467 | public long write(ByteBuffer[] srcs, int offset, int length) | ||
| 468 | throws IOException | ||
| 469 | { | ||
| 470 | if ((offset < 0) || (length < 0) || (offset > srcs.length - length)) | ||
| 471 | throw new IndexOutOfBoundsException(); | ||
| 472 | synchronized (writeLock) { | ||
| 473 | ensureWriteOpen(); | ||
| 474 | long n = 0; | ||
| 475 | try { | ||
| 476 | begin(); | ||
| 477 | synchronized (stateLock) { | ||
| 478 | if (!isOpen()) | ||
| 479 | return 0; | ||
| 480 | writerThread = NativeThread.current(); | ||
| 481 | } | ||
| 482 | for (;;) { | ||
| 483 | n = IOUtil.write(fd, srcs, offset, length, nd); | ||
| 484 | if ((n == IOStatus.INTERRUPTED) && isOpen()) | ||
| 485 | continue; | ||
| 486 | return IOStatus.normalize(n); | ||
| 487 | } | ||
| 488 | } finally { | ||
| 489 | writerCleanup(); | ||
| 490 | end((n > 0) || (n == IOStatus.UNAVAILABLE)); | ||
| 491 | synchronized (stateLock) { | ||
| 492 | if ((n <= 0) && (!isOutputOpen)) | ||
| 493 | throw new AsynchronousCloseException(); | ||
| 494 | } | ||
| 495 | assert IOStatus.check(n); | ||
| 496 | } | ||
| 497 | } | ||
| 498 | } | ||
| 499 | |||
| 500 | // package-private | ||
| 501 | int sendOutOfBandData(byte b) throws IOException { | ||
| 502 | synchronized (writeLock) { | ||
| 503 | ensureWriteOpen(); | ||
| 504 | int n = 0; | ||
| 505 | try { | ||
| 506 | begin(); | ||
| 507 | synchronized (stateLock) { | ||
| 508 | if (!isOpen()) | ||
| 509 | return 0; | ||
| 510 | writerThread = NativeThread.current(); | ||
| 511 | } | ||
| 512 | for (;;) { | ||
| 513 | n = sendOutOfBandData(fd, b); | ||
| 514 | if ((n == IOStatus.INTERRUPTED) && isOpen()) | ||
| 515 | continue; | ||
| 516 | return IOStatus.normalize(n); | ||
| 517 | } | ||
| 518 | } finally { | ||
| 519 | writerCleanup(); | ||
| 520 | end((n > 0) || (n == IOStatus.UNAVAILABLE)); | ||
| 521 | synchronized (stateLock) { | ||
| 522 | if ((n <= 0) && (!isOutputOpen)) | ||
| 523 | throw new AsynchronousCloseException(); | ||
| 524 | } | ||
| 525 | assert IOStatus.check(n); | ||
| 526 | } | ||
| 527 | } | ||
| 528 | } | ||
| 529 | |||
| 530 | protected void implConfigureBlocking(boolean block) throws IOException { | ||
| 531 | IOUtil.configureBlocking(fd, block); | ||
| 532 | } | ||
| 533 | |||
| 534 | public SocketAddress localAddress() { | ||
| 535 | synchronized (stateLock) { | ||
| 536 | return localAddress; | ||
| 537 | } | ||
| 538 | } | ||
| 539 | |||
| 540 | public SocketAddress remoteAddress() { | ||
| 541 | synchronized (stateLock) { | ||
| 542 | return remoteAddress; | ||
| 543 | } | ||
| 544 | } | ||
| 545 | |||
| 546 | @Override | ||
| 547 | public SocketChannel bind(SocketAddress local) throws IOException { | ||
| 548 | synchronized (readLock) { | ||
| 549 | synchronized (writeLock) { | ||
| 550 | synchronized (stateLock) { | ||
| 551 | if (!isOpen()) | ||
| 552 | throw new ClosedChannelException(); | ||
| 553 | if (state == ST_PENDING) | ||
| 554 | throw new ConnectionPendingException(); | ||
| 555 | if (localAddress != null) | ||
| 556 | throw new AlreadyBoundException(); | ||
| 557 | InetSocketAddress isa = (local == null) ? | ||
| 558 | new InetSocketAddress(0) : Net.checkAddress(local); | ||
| 559 | NetHooks.beforeTcpBind(fd, isa.getAddress(), isa.getPort()); | ||
| 560 | Net.bind(fd, isa.getAddress(), isa.getPort()); | ||
| 561 | localAddress = Net.localAddress(fd); | ||
| 562 | } | ||
| 563 | } | ||
| 564 | } | ||
| 565 | return this; | ||
| 566 | } | ||
| 567 | |||
| 568 | public boolean isConnected() { | ||
| 569 | synchronized (stateLock) { | ||
| 570 | return (state == ST_CONNECTED); | ||
| 571 | } | ||
| 572 | } | ||
| 573 | |||
| 574 | public boolean isConnectionPending() { | ||
| 575 | synchronized (stateLock) { | ||
| 576 | return (state == ST_PENDING); | ||
| 577 | } | ||
| 578 | } | ||
| 579 | |||
| 580 | void ensureOpenAndUnconnected() throws IOException { // package-private | ||
| 581 | synchronized (stateLock) { | ||
| 582 | if (!isOpen()) | ||
| 583 | throw new ClosedChannelException(); | ||
| 584 | if (state == ST_CONNECTED) | ||
| 585 | throw new AlreadyConnectedException(); | ||
| 586 | if (state == ST_PENDING) | ||
| 587 | throw new ConnectionPendingException(); | ||
| 588 | } | ||
| 589 | } | ||
| 590 | |||
| 591 | public boolean connect(SocketAddress sa) throws IOException { | ||
| 592 | int localPort = 0; | ||
| 593 | |||
| 594 | synchronized (readLock) { | ||
| 595 | synchronized (writeLock) { | ||
| 596 | ensureOpenAndUnconnected(); | ||
| 597 | InetSocketAddress isa = Net.checkAddress(sa); | ||
| 598 | SecurityManager sm = System.getSecurityManager(); | ||
| 599 | if (sm != null) | ||
| 600 | sm.checkConnect(isa.getAddress().getHostAddress(), | ||
| 601 | isa.getPort()); | ||
| 602 | synchronized (blockingLock()) { | ||
| 603 | int n = 0; | ||
| 604 | try { | ||
| 605 | try { | ||
| 606 | begin(); | ||
| 607 | synchronized (stateLock) { | ||
| 608 | if (!isOpen()) { | ||
| 609 | return false; | ||
| 610 | } | ||
| 611 | // notify hook only if unbound | ||
| 612 | if (localAddress == null) { | ||
| 613 | NetHooks.beforeTcpConnect(fd, | ||
| 614 | isa.getAddress(), | ||
| 615 | isa.getPort()); | ||
| 616 | } | ||
| 617 | readerThread = NativeThread.current(); | ||
| 618 | } | ||
| 619 | for (;;) { | ||
| 620 | InetAddress ia = isa.getAddress(); | ||
| 621 | if (ia.isAnyLocalAddress()) | ||
| 622 | ia = InetAddress.getLocalHost(); | ||
| 623 | n = Net.connect(fd, | ||
| 624 | ia, | ||
| 625 | isa.getPort()); | ||
| 626 | if ( (n == IOStatus.INTERRUPTED) | ||
| 627 | && isOpen()) | ||
| 628 | continue; | ||
| 629 | break; | ||
| 630 | } | ||
| 631 | |||
| 632 | synchronized (stateLock) { | ||
| 633 | if (isOpen() && (localAddress == null) || | ||
| 634 | ((InetSocketAddress)localAddress) | ||
| 635 | .getAddress().isAnyLocalAddress()) | ||
| 636 | { | ||
| 637 | // Socket was not bound before connecting or | ||
| 638 | // Socket was bound with an "anyLocalAddress" | ||
| 639 | localAddress = Net.localAddress(fd); | ||
| 640 | } | ||
| 641 | } | ||
| 642 | |||
| 643 | } finally { | ||
| 644 | readerCleanup(); | ||
| 645 | end((n > 0) || (n == IOStatus.UNAVAILABLE)); | ||
| 646 | assert IOStatus.check(n); | ||
| 647 | } | ||
| 648 | } catch (IOException x) { | ||
| 649 | // If an exception was thrown, close the channel after | ||
| 650 | // invoking end() so as to avoid bogus | ||
| 651 | // AsynchronousCloseExceptions | ||
| 652 | close(); | ||
| 653 | throw x; | ||
| 654 | } | ||
| 655 | synchronized (stateLock) { | ||
| 656 | remoteAddress = isa; | ||
| 657 | if (n > 0) { | ||
| 658 | |||
| 659 | // Connection succeeded; disallow further | ||
| 660 | // invocation | ||
| 661 | state = ST_CONNECTED; | ||
| 662 | return true; | ||
| 663 | } | ||
| 664 | // If nonblocking and no exception then connection | ||
| 665 | // pending; disallow another invocation | ||
| 666 | if (!isBlocking()) | ||
| 667 | state = ST_PENDING; | ||
| 668 | else | ||
| 669 | assert false; | ||
| 670 | } | ||
| 671 | } | ||
| 672 | return false; | ||
| 673 | } | ||
| 674 | } | ||
| 675 | } | ||
| 676 | |||
| 677 | public boolean finishConnect() throws IOException { | ||
| 678 | synchronized (readLock) { | ||
| 679 | synchronized (writeLock) { | ||
| 680 | synchronized (stateLock) { | ||
| 681 | if (!isOpen()) | ||
| 682 | throw new ClosedChannelException(); | ||
| 683 | if (state == ST_CONNECTED) | ||
| 684 | return true; | ||
| 685 | if (state != ST_PENDING) | ||
| 686 | throw new NoConnectionPendingException(); | ||
| 687 | } | ||
| 688 | int n = 0; | ||
| 689 | try { | ||
| 690 | try { | ||
| 691 | begin(); | ||
| 692 | synchronized (blockingLock()) { | ||
| 693 | synchronized (stateLock) { | ||
| 694 | if (!isOpen()) { | ||
| 695 | return false; | ||
| 696 | } | ||
| 697 | readerThread = NativeThread.current(); | ||
| 698 | } | ||
| 699 | if (!isBlocking()) { | ||
| 700 | for (;;) { | ||
| 701 | n = checkConnect(fd, false, | ||
| 702 | readyToConnect); | ||
| 703 | if ( (n == IOStatus.INTERRUPTED) | ||
| 704 | && isOpen()) | ||
| 705 | continue; | ||
| 706 | break; | ||
| 707 | } | ||
| 708 | } else { | ||
| 709 | for (;;) { | ||
| 710 | n = checkConnect(fd, true, | ||
| 711 | readyToConnect); | ||
| 712 | if (n == 0) { | ||
| 713 | // Loop in case of | ||
| 714 | // spurious notifications | ||
| 715 | continue; | ||
| 716 | } | ||
| 717 | if ( (n == IOStatus.INTERRUPTED) | ||
| 718 | && isOpen()) | ||
| 719 | continue; | ||
| 720 | break; | ||
| 721 | } | ||
| 722 | } | ||
| 723 | } | ||
| 724 | } finally { | ||
| 725 | synchronized (stateLock) { | ||
| 726 | readerThread = 0; | ||
| 727 | if (state == ST_KILLPENDING) { | ||
| 728 | kill(); | ||
| 729 | // poll()/getsockopt() does not report | ||
| 730 | // error (throws exception, with n = 0) | ||
| 731 | // on Linux platform after dup2 and | ||
| 732 | // signal-wakeup. Force n to 0 so the | ||
| 733 | // end() can throw appropriate exception | ||
| 734 | n = 0; | ||
| 735 | } | ||
| 736 | } | ||
| 737 | end((n > 0) || (n == IOStatus.UNAVAILABLE)); | ||
| 738 | assert IOStatus.check(n); | ||
| 739 | } | ||
| 740 | } catch (IOException x) { | ||
| 741 | // If an exception was thrown, close the channel after | ||
| 742 | // invoking end() so as to avoid bogus | ||
| 743 | // AsynchronousCloseExceptions | ||
| 744 | close(); | ||
| 745 | throw x; | ||
| 746 | } | ||
| 747 | if (n > 0) { | ||
| 748 | synchronized (stateLock) { | ||
| 749 | state = ST_CONNECTED; | ||
| 750 | } | ||
| 751 | return true; | ||
| 752 | } | ||
| 753 | return false; | ||
| 754 | } | ||
| 755 | } | ||
| 756 | } | ||
| 757 | |||
| 758 | @Override | ||
| 759 | public SocketChannel shutdownInput() throws IOException { | ||
| 760 | synchronized (stateLock) { | ||
| 761 | if (!isOpen()) | ||
| 762 | throw new ClosedChannelException(); | ||
| 763 | if (!isConnected()) | ||
| 764 | throw new NotYetConnectedException(); | ||
| 765 | if (isInputOpen) { | ||
| 766 | Net.shutdown(fd, Net.SHUT_RD); | ||
| 767 | if (readerThread != 0) | ||
| 768 | NativeThread.signal(readerThread); | ||
| 769 | isInputOpen = false; | ||
| 770 | } | ||
| 771 | return this; | ||
| 772 | } | ||
| 773 | } | ||
| 774 | |||
| 775 | @Override | ||
| 776 | public SocketChannel shutdownOutput() throws IOException { | ||
| 777 | synchronized (stateLock) { | ||
| 778 | if (!isOpen()) | ||
| 779 | throw new ClosedChannelException(); | ||
| 780 | if (!isConnected()) | ||
| 781 | throw new NotYetConnectedException(); | ||
| 782 | if (isOutputOpen) { | ||
| 783 | Net.shutdown(fd, Net.SHUT_WR); | ||
| 784 | if (writerThread != 0) | ||
| 785 | NativeThread.signal(writerThread); | ||
| 786 | isOutputOpen = false; | ||
| 787 | } | ||
| 788 | return this; | ||
| 789 | } | ||
| 790 | } | ||
| 791 | |||
| 792 | public boolean isInputOpen() { | ||
| 793 | synchronized (stateLock) { | ||
| 794 | return isInputOpen; | ||
| 795 | } | ||
| 796 | } | ||
| 797 | |||
| 798 | public boolean isOutputOpen() { | ||
| 799 | synchronized (stateLock) { | ||
| 800 | return isOutputOpen; | ||
| 801 | } | ||
| 802 | } | ||
| 803 | |||
| 804 | // AbstractInterruptibleChannel synchronizes invocations of this method | ||
| 805 | // using AbstractInterruptibleChannel.closeLock, and also ensures that this | ||
| 806 | // method is only ever invoked once. Before we get to this method, isOpen | ||
| 807 | // (which is volatile) will have been set to false. | ||
| 808 | // | ||
| 809 | protected void implCloseSelectableChannel() throws IOException { | ||
| 810 | synchronized (stateLock) { | ||
| 811 | isInputOpen = false; | ||
| 812 | isOutputOpen = false; | ||
| 813 | |||
| 814 | // Close the underlying file descriptor and dup it to a known fd | ||
| 815 | // that's already closed. This prevents other operations on this | ||
| 816 | // channel from using the old fd, which might be recycled in the | ||
| 817 | // meantime and allocated to an entirely different channel. | ||
| 818 | // | ||
| 819 | nd.preClose(fd); | ||
| 820 | |||
| 821 | // Signal native threads, if needed. If a target thread is not | ||
| 822 | // currently blocked in an I/O operation then no harm is done since | ||
| 823 | // the signal handler doesn't actually do anything. | ||
| 824 | // | ||
| 825 | if (readerThread != 0) | ||
| 826 | NativeThread.signal(readerThread); | ||
| 827 | |||
| 828 | if (writerThread != 0) | ||
| 829 | NativeThread.signal(writerThread); | ||
| 830 | |||
| 831 | // If this channel is not registered then it's safe to close the fd | ||
| 832 | // immediately since we know at this point that no thread is | ||
| 833 | // blocked in an I/O operation upon the channel and, since the | ||
| 834 | // channel is marked closed, no thread will start another such | ||
| 835 | // operation. If this channel is registered then we don't close | ||
| 836 | // the fd since it might be in use by a selector. In that case | ||
| 837 | // closing this channel caused its keys to be cancelled, so the | ||
| 838 | // last selector to deregister a key for this channel will invoke | ||
| 839 | // kill() to close the fd. | ||
| 840 | // | ||
| 841 | if (!isRegistered()) | ||
| 842 | kill(); | ||
| 843 | } | ||
| 844 | } | ||
| 845 | |||
| 846 | public void kill() throws IOException { | ||
| 847 | synchronized (stateLock) { | ||
| 848 | if (state == ST_KILLED) | ||
| 849 | return; | ||
| 850 | if (state == ST_UNINITIALIZED) { | ||
| 851 | state = ST_KILLED; | ||
| 852 | return; | ||
| 853 | } | ||
| 854 | assert !isOpen() && !isRegistered(); | ||
| 855 | |||
| 856 | // Postpone the kill if there is a waiting reader | ||
| 857 | // or writer thread. See the comments in read() for | ||
| 858 | // more detailed explanation. | ||
| 859 | if (readerThread == 0 && writerThread == 0) { | ||
| 860 | nd.close(fd); | ||
| 861 | state = ST_KILLED; | ||
| 862 | } else { | ||
| 863 | state = ST_KILLPENDING; | ||
| 864 | } | ||
| 865 | } | ||
| 866 | } | ||
| 867 | |||
| 868 | /** | ||
| 869 | * Translates native poll revent ops into a ready operation ops | ||
| 870 | */ | ||
| 871 | public boolean translateReadyOps(int ops, int initialOps, | ||
| 872 | SelectionKeyImpl sk) { | ||
| 873 | int intOps = sk.nioInterestOps(); // Do this just once, it synchronizes | ||
| 874 | int oldOps = sk.nioReadyOps(); | ||
| 875 | int newOps = initialOps; | ||
| 876 | |||
| 877 | if ((ops & PollArrayWrapper.POLLNVAL) != 0) { | ||
| 878 | // This should only happen if this channel is pre-closed while a | ||
| 879 | // selection operation is in progress | ||
| 880 | // ## Throw an error if this channel has not been pre-closed | ||
| 881 | return false; | ||
| 882 | } | ||
| 883 | |||
| 884 | if ((ops & (PollArrayWrapper.POLLERR | ||
| 885 | | PollArrayWrapper.POLLHUP)) != 0) { | ||
| 886 | newOps = intOps; | ||
| 887 | sk.nioReadyOps(newOps); | ||
| 888 | // No need to poll again in checkConnect, | ||
| 889 | // the error will be detected there | ||
| 890 | readyToConnect = true; | ||
| 891 | return (newOps & ~oldOps) != 0; | ||
| 892 | } | ||
| 893 | |||
| 894 | if (((ops & PollArrayWrapper.POLLIN) != 0) && | ||
| 895 | ((intOps & SelectionKey.OP_READ) != 0) && | ||
| 896 | (state == ST_CONNECTED)) | ||
| 897 | newOps |= SelectionKey.OP_READ; | ||
| 898 | |||
| 899 | if (((ops & PollArrayWrapper.POLLCONN) != 0) && | ||
| 900 | ((intOps & SelectionKey.OP_CONNECT) != 0) && | ||
| 901 | ((state == ST_UNCONNECTED) || (state == ST_PENDING))) { | ||
| 902 | newOps |= SelectionKey.OP_CONNECT; | ||
| 903 | readyToConnect = true; | ||
| 904 | } | ||
| 905 | |||
| 906 | if (((ops & PollArrayWrapper.POLLOUT) != 0) && | ||
| 907 | ((intOps & SelectionKey.OP_WRITE) != 0) && | ||
| 908 | (state == ST_CONNECTED)) | ||
| 909 | newOps |= SelectionKey.OP_WRITE; | ||
| 910 | |||
| 911 | sk.nioReadyOps(newOps); | ||
| 912 | return (newOps & ~oldOps) != 0; | ||
| 913 | } | ||
| 914 | |||
| 915 | public boolean translateAndUpdateReadyOps(int ops, SelectionKeyImpl sk) { | ||
| 916 | return translateReadyOps(ops, sk.nioReadyOps(), sk); | ||
| 917 | } | ||
| 918 | |||
| 919 | public boolean translateAndSetReadyOps(int ops, SelectionKeyImpl sk) { | ||
| 920 | return translateReadyOps(ops, 0, sk); | ||
| 921 | } | ||
| 922 | |||
| 923 | /** | ||
| 924 | * Translates an interest operation set into a native poll event set | ||
| 925 | */ | ||
| 926 | public void translateAndSetInterestOps(int ops, SelectionKeyImpl sk) { | ||
| 927 | int newOps = 0; | ||
| 928 | if ((ops & SelectionKey.OP_READ) != 0) | ||
| 929 | newOps |= PollArrayWrapper.POLLIN; | ||
| 930 | if ((ops & SelectionKey.OP_WRITE) != 0) | ||
| 931 | newOps |= PollArrayWrapper.POLLOUT; | ||
| 932 | if ((ops & SelectionKey.OP_CONNECT) != 0) | ||
| 933 | newOps |= PollArrayWrapper.POLLCONN; | ||
| 934 | sk.selector.putEventOps(sk, newOps); | ||
| 935 | } | ||
| 936 | |||
| 937 | public FileDescriptor getFD() { | ||
| 938 | return fd; | ||
| 939 | } | ||
| 940 | |||
| 941 | public int getFDVal() { | ||
| 942 | return fdVal; | ||
| 943 | } | ||
| 944 | |||
| 945 | public String toString() { | ||
| 946 | StringBuffer sb = new StringBuffer(); | ||
| 947 | sb.append(this.getClass().getSuperclass().getName()); | ||
| 948 | sb.append('['); | ||
| 949 | if (!isOpen()) | ||
| 950 | sb.append("closed"); | ||
| 951 | else { | ||
| 952 | synchronized (stateLock) { | ||
| 953 | switch (state) { | ||
| 954 | case ST_UNCONNECTED: | ||
| 955 | sb.append("unconnected"); | ||
| 956 | break; | ||
| 957 | case ST_PENDING: | ||
| 958 | sb.append("connection-pending"); | ||
| 959 | break; | ||
| 960 | case ST_CONNECTED: | ||
| 961 | sb.append("connected"); | ||
| 962 | if (!isInputOpen) | ||
| 963 | sb.append(" ishut"); | ||
| 964 | if (!isOutputOpen) | ||
| 965 | sb.append(" oshut"); | ||
| 966 | break; | ||
| 967 | } | ||
| 968 | if (localAddress() != null) { | ||
| 969 | sb.append(" local="); | ||
| 970 | sb.append(localAddress().toString()); | ||
| 971 | } | ||
| 972 | if (remoteAddress() != null) { | ||
| 973 | sb.append(" remote="); | ||
| 974 | sb.append(remoteAddress().toString()); | ||
| 975 | } | ||
| 976 | } | ||
| 977 | } | ||
| 978 | sb.append(']'); | ||
| 979 | return sb.toString(); | ||
| 980 | } | ||
| 981 | |||
| 982 | |||
| 983 | // -- Native methods -- | ||
| 984 | |||
| 985 | private static native int checkConnect(FileDescriptor fd, | ||
| 986 | boolean block, boolean ready) | ||
| 987 | throws IOException; | ||
| 988 | |||
| 989 | private static native int sendOutOfBandData(FileDescriptor fd, byte data) | ||
| 990 | throws IOException; | ||
| 991 | |||
| 992 | static { | ||
| 993 | Util.load(); | ||
| 994 | nd = new SocketDispatcher(); | ||
| 995 | } | ||
| 996 | |||
| 997 | } | ||