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prepSendFd() — netty Function Reference

Architecture documentation for the prepSendFd() function in MsgHdr.java from the netty codebase.

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Entity Profile

Dependency Diagram

graph TD
  1c0c157c_7d1a_fcb5_0464_ea2479cedb64["prepSendFd()"]
  4a81f547_d99c_c526_30f9_847735bb8edf["MsgHdr"]
  1c0c157c_7d1a_fcb5_0464_ea2479cedb64 -->|defined in| 4a81f547_d99c_c526_30f9_847735bb8edf
  style 1c0c157c_7d1a_fcb5_0464_ea2479cedb64 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

transport-classes-io_uring/src/main/java/io/netty/channel/uring/MsgHdr.java lines 92–109

    static void prepSendFd(ByteBuffer memory, int fd, ByteBuffer msgControl,
                           int cmsgHdrDataOffset, ByteBuffer iovMemory, int iovLength) {
        int memoryPosition = memory.position();
        long msgControlAddr = Buffer.memoryAddress(msgControl);
        CmsgHdr.writeScmRights(msgControl, cmsgHdrDataOffset, fd);
        if (Native.SIZEOF_SIZE_T == 4) {
            memory.putInt(memoryPosition + Native.MSGHDR_OFFSETOF_MSG_CONTROL, (int) msgControlAddr);
            memory.putInt(memoryPosition + Native.MSGHDR_OFFSETOF_MSG_CONTROLLEN, Native.MSG_CONTROL_LEN_FOR_FD);
            memory.putInt(memoryPosition + Native.MSGHDR_OFFSETOF_MSG_IOV, (int) Buffer.memoryAddress(iovMemory));
            memory.putInt(memoryPosition + Native.MSGHDR_OFFSETOF_MSG_IOVLEN, iovLength);
        } else {
            assert Native.SIZEOF_SIZE_T == 8;
            memory.putLong(memoryPosition + Native.MSGHDR_OFFSETOF_MSG_CONTROL, msgControlAddr);
            memory.putLong(memoryPosition + Native.MSGHDR_OFFSETOF_MSG_CONTROLLEN, Native.MSG_CONTROL_LEN_FOR_FD);
            memory.putLong(memoryPosition + Native.MSGHDR_OFFSETOF_MSG_IOV, Buffer.memoryAddress(iovMemory));
            memory.putLong(memoryPosition + Native.MSGHDR_OFFSETOF_MSG_IOVLEN, iovLength);
        }
    }

Domain

Subdomains

Defined In

Source

Frequently Asked Questions

What does prepSendFd() do?
prepSendFd() is a function in the netty codebase, defined in transport-classes-io_uring/src/main/java/io/netty/channel/uring/MsgHdr.java.
Where is prepSendFd() defined?
prepSendFd() is defined in transport-classes-io_uring/src/main/java/io/netty/channel/uring/MsgHdr.java at line 92.

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