WSASetLastError

// WS2_32.dll
#include <windows.h>

void WSASetLastError(
    INT iError
);

<DllImport("WS2_32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Sub WSASetLastError(
    iError As Integer   ' INT
)
End Sub

' iError : INT
Declare PtrSafe Sub WSASetLastError Lib "ws2_32" ( _
    ByVal iError As Long)
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

WSASetLastError = ctypes.windll.ws2_32.WSASetLastError
WSASetLastError.restype = None
WSASetLastError.argtypes = [
    ctypes.c_int,  # iError : INT
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('WS2_32.dll')
WSASetLastError = Fiddle::Function.new(
  lib['WSASetLastError'],
  [
    Fiddle::TYPE_INT,  # iError : INT
  ],
  Fiddle::TYPE_VOID)

#[link(name = "ws2_32")]
extern "system" {
    fn WSASetLastError(
        iError: i32  // INT
    );
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("WS2_32.dll", SetLastError = true)]
public static extern void WSASetLastError(int iError);
"@
$api = Add-Type -MemberDefinition $sig -Name 'WS2_32_WSASetLastError' -Namespace Win32 -PassThru
# $api::WSASetLastError(iError)

#uselib "WS2_32.dll"
#func global WSASetLastError "WSASetLastError" sptr
; WSASetLastError iError
; iError : INT -> "sptr"

#uselib "WS2_32.dll"
#func global WSASetLastError "WSASetLastError" int
; WSASetLastError iError
; iError : INT -> "int"

; void WSASetLastError(INT iError)
#uselib "WS2_32.dll"
#func global WSASetLastError "WSASetLastError" int
; WSASetLastError iError
; iError : INT -> "int"

import (
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	ws2_32 = windows.NewLazySystemDLL("WS2_32.dll")
	procWSASetLastError = ws2_32.NewProc("WSASetLastError")
)

// iError (INT)
r1, _, err := procWSASetLastError.Call(
	uintptr(iError),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // void

procedure WSASetLastError(
  iError: Integer   // INT
); stdcall;
  external 'WS2_32.dll' name 'WSASetLastError';

result := DllCall("WS2_32\WSASetLastError"
    , "Int", iError   ; INT
    , "Int")   ; return: void

●WSASetLastError(iError) = DLL("WS2_32.dll", "int WSASetLastError(int)")
# 呼び出し: WSASetLastError(iError)
# iError : INT -> "int"
# なでしこ1は32bit・ANSI(Shift_JIS)。文字列=char*(ANSI)、ポインタ/ハンドル=void*(4byte)。