listen

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

INT listen(
    SOCKET s,
    INT backlog
);

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

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

import ctypes
from ctypes import wintypes

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

require 'fiddle'
require 'fiddle/import'

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

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

$sig = @"
[DllImport("WS2_32.dll", SetLastError = true)]
public static extern int listen(UIntPtr s, int backlog);
"@
$api = Add-Type -MemberDefinition $sig -Name 'WS2_32_listen' -Namespace Win32 -PassThru
# $api::listen(s, backlog)

#uselib "WS2_32.dll"
#func global listen "listen" sptr, sptr
; listen s, backlog   ; 戻り値は stat
; s : SOCKET -> "sptr"
; backlog : INT -> "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 listen "listen" sptr, int
; res = listen(s, backlog)
; s : SOCKET -> "sptr"
; backlog : INT -> "int"

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

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

var (
	ws2_32 = windows.NewLazySystemDLL("WS2_32.dll")
	proclisten = ws2_32.NewProc("listen")
)

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

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

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

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