1 /*
2 * Copyright 2024 The Netty Project
3 *
4 * The Netty Project licenses this file to you under the Apache License,
5 * version 2.0 (the "License"); you may not use this file except in compliance
6 * with the License. You may obtain a copy of the License at:
7 *
8 * https://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13 * License for the specific language governing permissions and limitations
14 * under the License.
15 */
16 package io.netty.channel.uring;
17
18 import java.nio.ByteBuffer;
19
20 /**
21 * <pre>{@code
22 * struct cmsghdr {
23 * socklen_t cmsg_len; // data byte count, including header
24 * int cmsg_level; //originating protocol
25 * int cmsg_type; // protocol-specific type
26 * // followed by unsigned char cmsg_data[];
27 * };
28 * }</pre>
29 */
30 final class CmsgHdr {
31
32 private CmsgHdr() { }
33
34 static void write(ByteBuffer cmsghdr, int cmsgHdrDataOffset,
35 int cmsgLen, int cmsgLevel, int cmsgType, short segmentSize) {
36 int cmsghdrPosition = cmsghdr.position();
37 if (Native.SIZEOF_SIZE_T == 4) {
38 cmsghdr.putInt(cmsghdrPosition + Native.CMSG_OFFSETOF_CMSG_LEN, cmsgLen);
39 } else {
40 assert Native.SIZEOF_SIZE_T == 8;
41 cmsghdr.putLong(cmsghdrPosition + Native.CMSG_OFFSETOF_CMSG_LEN, cmsgLen);
42 }
43 cmsghdr.putInt(cmsghdrPosition + Native.CMSG_OFFSETOF_CMSG_LEVEL, cmsgLevel);
44 cmsghdr.putInt(cmsghdrPosition + Native.CMSG_OFFSETOF_CMSG_TYPE, cmsgType);
45 cmsghdr.putShort(cmsghdrPosition + cmsgHdrDataOffset, segmentSize);
46 }
47 }