IncomingMessage

pub const IncomingMessage = struct {
    /// Populated by receive functions.
    from: IpAddress,
    /// Populated by receive functions, points into the caller-supplied buffer.
    data: []u8,
    /// Supplied by caller before calling receive functions; mutated by receive
    /// functions.
    control: []u8,
    /// Populated by receive functions.
    flags: Flags,

    /// Useful for initializing before calling `receiveManyTimeout`.
    pub const init: IncomingMessage = .{
        .from = undefined,
        .data = undefined,
        .control = &.{},
        .flags = undefined,
    };

    pub const Flags = packed struct(u8) {
        /// indicates end-of-record; the data returned completed a record
        /// (generally used with sockets of type SOCK_SEQPACKET).
        eor: bool,
        /// indicates that the trailing portion of a datagram was discarded
        /// because the datagram was larger than the buffer supplied.
        trunc: bool,
        /// indicates that some control data was discarded due to lack of
        /// space in the buffer for ancil‐ lary data.
        ctrunc: bool,
        /// indicates expedited or out-of-band data was received.
        oob: bool,
        /// indicates that no data was received but an extended error from the
        /// socket error queue.
        errqueue: bool,
        _: u3 = 0,
    };
}