closesocket

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

INT closesocket(
    SOCKET s
);

<DllImport("WS2_32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function closesocket(
    s As UIntPtr   ' SOCKET
) As Integer
End Function

' s : SOCKET
Declare PtrSafe Function closesocket Lib "ws2_32" ( _
    ByVal s As LongPtr) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

closesocket = ctypes.windll.ws2_32.closesocket
closesocket.restype = ctypes.c_int
closesocket.argtypes = [
    ctypes.c_size_t,  # s : SOCKET
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('WS2_32.dll')
closesocket = Fiddle::Function.new(
  lib['closesocket'],
  [
    Fiddle::TYPE_UINTPTR_T,  # s : SOCKET
  ],
  Fiddle::TYPE_INT)

#[link(name = "ws2_32")]
extern "system" {
    fn closesocket(
        s: usize  // SOCKET
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("WS2_32.dll", SetLastError = true)]
public static extern int closesocket(UIntPtr s);
"@
$api = Add-Type -MemberDefinition $sig -Name 'WS2_32_closesocket' -Namespace Win32 -PassThru
# $api::closesocket(s)

#uselib "WS2_32.dll"
#func global closesocket "closesocket" sptr
; closesocket s   ; 戻り値は stat
; s : SOCKET -> "sptr"
; ※HSP3.7は #func のため戻り値はシステム変数 stat に格納されます。

#uselib "WS2_32.dll"
#cfunc global closesocket "closesocket" sptr
; res = closesocket(s)
; s : SOCKET -> "sptr"

; INT closesocket(SOCKET s)
#uselib "WS2_32.dll"
#cfunc global closesocket "closesocket" intptr
; res = closesocket(s)
; s : SOCKET -> "intptr"

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

var (
	ws2_32 = windows.NewLazySystemDLL("WS2_32.dll")
	procclosesocket = ws2_32.NewProc("closesocket")
)

// s (SOCKET)
r1, _, err := procclosesocket.Call(
	uintptr(s),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function closesocket(
  s: NativeUInt   // SOCKET
): Integer; stdcall;
  external 'WS2_32.dll' name 'closesocket';

result := DllCall("WS2_32\closesocket"
    , "UPtr", s   ; SOCKET
    , "Int")   ; return: INT

●closesocket(s) = DLL("WS2_32.dll", "int closesocket(int)")
# 呼び出し: closesocket(s)
# s : SOCKET -> "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)。