MsgHdrMemory.java — netty Source File

Source Code

/*
 * Copyright 2024 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package io.netty.channel.uring;

import io.netty.buffer.ByteBuf;
import io.netty.channel.socket.DatagramPacket;
import io.netty.channel.unix.Buffer;
import io.netty.util.internal.CleanableDirectBuffer;
import io.netty.util.internal.PlatformDependent;

import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;

final class MsgHdrMemory {
    public static final int MSG_HDR_SIZE =
            Native.SIZEOF_MSGHDR + Native.SIZEOF_SOCKADDR_STORAGE + Native.SIZEOF_IOVEC + Native.CMSG_SPACE;
    private static final byte[] EMPTY_SOCKADDR_STORAGE = new byte[Native.SIZEOF_SOCKADDR_STORAGE];
    // It is not possible to have a zero length buffer in sendFd,
    // so we use a 1 byte buffer here.
    private static final int GLOBAL_IOV_LEN = 1;
    private static final ByteBuffer GLOBAL_IOV_BASE =  Buffer.allocateDirectWithNativeOrder(GLOBAL_IOV_LEN);
    private static final long GLOBAL_IOV_BASE_ADDRESS = Buffer.memoryAddress(GLOBAL_IOV_BASE);
    private final CleanableDirectBuffer msgHdrMemoryCleanable;
    private final CleanableDirectBuffer socketAddrMemoryCleanable;
    private final CleanableDirectBuffer iovMemoryCleanable;
    private final CleanableDirectBuffer cmsgDataMemoryCleanable;
    private final ByteBuffer msgHdrMemory;
    private final ByteBuffer socketAddrMemory;
    private final ByteBuffer iovMemory;
    private final ByteBuffer cmsgDataMemory;

    private final long msgHdrMemoryAddress;
    private final short idx;
    private final int cmsgDataOffset;

    MsgHdrMemory(short idx, ByteBuffer msgHdrMemoryArray) {
        this.idx = idx;
        this.msgHdrMemoryCleanable = null;
        this.socketAddrMemoryCleanable = null;
        this.iovMemoryCleanable = null;
        this.cmsgDataMemoryCleanable = null;
        int offset = idx * MSG_HDR_SIZE;
        // ByteBuffer.slice(int, int) / duplicate() are specified to produce BIG_ENDIAN byte buffers.
        // Set native order explicitly so native structs written via putInt/putLong use the expected endianness.
        this.msgHdrMemory = PlatformDependent.offsetSlice(
                msgHdrMemoryArray, offset, Native.SIZEOF_MSGHDR
// ... (132 more lines)