FD_SET

using System;
using System.Runtime.InteropServices;

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct FD_SET
{
    public uint fd_count;
    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 64)] public UIntPtr[] fd_array;
}

Imports System.Runtime.InteropServices

<StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Unicode)>
Public Structure FD_SET
    Public fd_count As UInteger
    <MarshalAs(UnmanagedType.ByValArray, SizeConst:=64)> Public fd_array() As UIntPtr
End Structure

import ctypes
from ctypes import wintypes

class FD_SET(ctypes.Structure):
    _fields_ = [
        ("fd_count", wintypes.DWORD),
        ("fd_array", ctypes.c_size_t * 64),
    ]

#[repr(C)]
pub struct FD_SET {
    pub fd_count: u32,
    pub fd_array: [usize; 64],
}

import "golang.org/x/sys/windows"

type FD_SET struct {
	fd_count uint32
	fd_array [64]uintptr
}

type
  FD_SET = record
    fd_count: DWORD;
    fd_array: array[0..63] of NativeUInt;
  end;

const FD_SET = extern struct {
    fd_count: u32,
    fd_array: [64]usize,
};

type
  FD_SET {.bycopy.} = object
    fd_count: uint32
    fd_array: array[64, uint]

struct FD_SET
{
    uint fd_count;
    size_t[64] fd_array;
}