accept

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

SOCKET accept(
    SOCKET s,
    SOCKADDR* addr,   // optional
    INT* addrlen   // optional
);

<DllImport("WS2_32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function accept(
    s As UIntPtr,   ' SOCKET
    addr As IntPtr,   ' SOCKADDR* optional, out
    addrlen As IntPtr   ' INT* optional, in/out
) As UIntPtr
End Function

' s : SOCKET
' addr : SOCKADDR* optional, out
' addrlen : INT* optional, in/out
Declare PtrSafe Function accept Lib "ws2_32" ( _
    ByVal s As LongPtr, _
    ByVal addr As LongPtr, _
    ByVal addrlen As LongPtr) As LongPtr
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

accept = ctypes.windll.ws2_32.accept
accept.restype = ctypes.c_size_t
accept.argtypes = [
    ctypes.c_size_t,  # s : SOCKET
    ctypes.c_void_p,  # addr : SOCKADDR* optional, out
    ctypes.POINTER(ctypes.c_int),  # addrlen : INT* optional, in/out
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('WS2_32.dll')
accept = Fiddle::Function.new(
  lib['accept'],
  [
    Fiddle::TYPE_UINTPTR_T,  # s : SOCKET
    Fiddle::TYPE_VOIDP,  # addr : SOCKADDR* optional, out
    Fiddle::TYPE_VOIDP,  # addrlen : INT* optional, in/out
  ],
  Fiddle::TYPE_UINTPTR_T)

#[link(name = "ws2_32")]
extern "system" {
    fn accept(
        s: usize,  // SOCKET
        addr: *mut SOCKADDR,  // SOCKADDR* optional, out
        addrlen: *mut i32  // INT* optional, in/out
    ) -> usize;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("WS2_32.dll", SetLastError = true)]
public static extern UIntPtr accept(UIntPtr s, IntPtr addr, IntPtr addrlen);
"@
$api = Add-Type -MemberDefinition $sig -Name 'WS2_32_accept' -Namespace Win32 -PassThru
# $api::accept(s, addr, addrlen)

#uselib "WS2_32.dll"
#func global accept "accept" sptr, sptr, sptr
; accept s, varptr(addr), varptr(addrlen)   ; 戻り値は stat
; s : SOCKET -> "sptr"
; addr : SOCKADDR* optional, out -> "sptr"
; addrlen : INT* optional, in/out -> "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 accept "accept" sptr, var, var
; res = accept(s, addr, addrlen)
; s : SOCKET -> "sptr"
; addr : SOCKADDR* optional, out -> "var"
; addrlen : INT* optional, in/out -> "var"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

; SOCKET accept(SOCKET s, SOCKADDR* addr, INT* addrlen)
#uselib "WS2_32.dll"
#cfunc global accept "accept" intptr, var, var
; res = accept(s, addr, addrlen)
; s : SOCKET -> "intptr"
; addr : SOCKADDR* optional, out -> "var"
; addrlen : INT* optional, in/out -> "var"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

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

var (
	ws2_32 = windows.NewLazySystemDLL("WS2_32.dll")
	procaccept = ws2_32.NewProc("accept")
)

// s (SOCKET), addr (SOCKADDR* optional, out), addrlen (INT* optional, in/out)
r1, _, err := procaccept.Call(
	uintptr(s),
	uintptr(addr),
	uintptr(addrlen),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // SOCKET

function accept(
  s: NativeUInt;   // SOCKET
  addr: Pointer;   // SOCKADDR* optional, out
  addrlen: Pointer   // INT* optional, in/out
): NativeUInt; stdcall;
  external 'WS2_32.dll' name 'accept';

result := DllCall("WS2_32\accept"
    , "UPtr", s   ; SOCKET
    , "Ptr", addr   ; SOCKADDR* optional, out
    , "Ptr", addrlen   ; INT* optional, in/out
    , "UPtr")   ; return: SOCKET

●accept(s, addr, addrlen) = DLL("WS2_32.dll", "int accept(int, void*, void*)")
# 呼び出し: accept(s, addr, addrlen)
# s : SOCKET -> "int"
# addr : SOCKADDR* optional, out -> "void*"
# addrlen : INT* optional, in/out -> "void*"
# 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)。