/** @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; }
/** @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; }
/** @inheritDoc */ public int available(int fd) throws IOException { int err = ioctl.ioctl(fd, Ioctl.FIONREAD, availableBuf.address().toUWord().toPrimitive()); int result = availableBuf.getInt(0); LibCUtil.errCheckNeg(err); if (DEBUG) { System.err.println("available(" + fd + ") = " + result); } return result; }
/** * get a socket option * * @param socket socket descriptor * @param option_name * @throws IOException on error */ public int getSockOpt(int socket, int option_name) throws IOException { IntByReference value = new IntByReference(0); IntByReference opt_len = new IntByReference(4); if (DEBUG) { System.out.println("getsockopt(" + socket + ", " + option_name + ")"); } int err = sockets.getsockopt(socket, Socket.SOL_SOCKET, option_name, value, opt_len); int result = value.getValue(); value.free(); if (false) Assert.that(opt_len.getValue() == 4); opt_len.free(); LibCUtil.errCheckNeg(err); return result; }
/** * set a socket option * * @param socket socket descriptor * @param option_name * @param option_value new value * @throws IOException on error */ public void setSockOpt(int socket, int option_name, int option_value) throws IOException { IntByReference value = new IntByReference(option_value); int err = sockets.setsockopt(socket, Socket.SOL_SOCKET, option_name, value, 4); value.free(); LibCUtil.errCheckNeg(err); }