Пример #1
0
  /** @inheritDoc */
  public int writeBuf(int fd, byte buffer[], int off, int len) throws IOException {
    int result = 0;
    byte[] buf = buffer;
    if (off != 0) {
      buf = new byte[len];
      System.arraycopy(buffer, off, buf, 0, len);
    }

    if (DEBUG) {
      System.err.println("writeBuf(" + fd + ") before write.");
    }

    result = libc.write(fd, buf, len); // We rely on open0() for setting the socket to non-blocking

    if (result < 0) {
      int err_code = LibCUtil.errno();
      if (err_code == LibC.EWOULDBLOCK) {
        VMThread.getSystemEvents().waitForWriteEvent(fd);
        if (DEBUG) {
          System.err.println("writeBuf(" + fd + ") returned from select. retry.");
        }
        result =
            libc.write(fd, buf, len); // We rely on open0() for setting the socket to non-blocking
      }
      if (DEBUG) {
        System.err.println("writeBuf(" + fd + ") error:");
      }
      LibCUtil.errCheckNeg(result);
    }

    return result;
  }
Пример #2
0
  /** @inheritDoc */
  public int readBuf(int fd, byte b[], int offset, int length) throws IOException {
    byte[] buf = b;
    if (offset != 0) {
      buf = new byte[length];
    }
    int result =
        libc.read(fd, buf, length); // We rely on open0() for setting the socket to non-blocking

    if (result < 0) {
      int err_code = LibCUtil.errno();
      if (err_code == LibC.EWOULDBLOCK) {
        VMThread.getSystemEvents().waitForReadEvent(fd);
        result =
            libc.read(fd, buf, length); // We rely on open0() for setting the socket to non-blocking
      }
      LibCUtil.errCheckNeg(result);
    }

    if (result == 0) {
      // If remote side has shut down the connection gracefully, and all
      // data has been received, recv() will complete immediately with
      // zero bytes received.
      //
      // This is true for Win32/CE and Linux
      result = -1;
    }

    return result;
  }
Пример #3
0
 /** Read errno, try to clean up fd, and create exception. */
 private IOException newError(int fd, String msg) {
   if (DEBUG) {
     VM.print(msg);
     VM.print(": errno: ");
   }
   int err_code = LibCUtil.errno();
   if (DEBUG) {
     VM.print(err_code);
     VM.println();
   }
   sockets.shutdown(fd, 2);
   libc.close(fd);
   return new IOException(" errno: " + err_code + " on fd: " + fd + " during " + msg);
 }
Пример #4
0
  /** @inheritDoc */
  public int open(String hostname, int port, int mode) throws IOException {
    // init_sockets(); win32 only
    int fd = -1;

    fd = sockets.socket(Socket.AF_INET, Socket.SOCK_STREAM, 0);
    if (DEBUG) {
      System.err.println("Socket.socket() = " + fd);
    }
    if (fd < 0) {
      throw newError(fd, "socket create");
    }

    set_blocking_flags(fd, /*is_blocking*/ false);

    NetDB.hostent phostent;
    // hostname is always NUL terminated. See socket/Protocol.java for detail.
    phostent = NetDB.INSTANCE.gethostbyname(hostname);
    if (phostent == null) {
      throw newError(fd, "gethostbyname (herrono = " + NetDB.INSTANCE.h_errno() + ")");
    }

    Socket.sockaddr_in destination_sin = new Socket.sockaddr_in();
    destination_sin.sin_family = Socket.AF_INET;
    destination_sin.sin_port = Inet.htons((short) port);
    destination_sin.sin_addr = phostent.h_addr_list[0];

    if (DEBUG) {
      System.err.println("Socket.sockaddr_in: " + destination_sin);
      System.err.println("connect: hostname: " + hostname + " port: " + port + " mode: " + mode);
    }
    if (sockets.connect(fd, destination_sin, destination_sin.size()) < 0) {
      int err_code = LibCUtil.errno();
      if (err_code == LibC.EINPROGRESS || err_code == LibC.EWOULDBLOCK) {
        // When the socket is ready for connect, it becomes *writable*
        // (according to BSD socket spec of select())
        VMThread.getSystemEvents().waitForWriteEvent(fd);
      } else {
        throw newError(fd, "connect");
      }
    }

    return fd;
  }