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Date:	Fri, 12 Aug 2022 20:01:37 +0800 (CST)
From:	dragon <malongfei1230 AT 163 DOT com>
To:	"cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
Subject:	Failed to get interface list while using ioctl (WSAIoctl) compiled
	by cygwin
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Hi, 

    Thans for your attention.

    I had a problem doing porting the network part¡£I want to get a list of network devices that can be implemented on Linux with an ioctl interface. A set of ioctl interfaces is also provided on Windows called WSAIoctl with cmd SIO_GET_INTERFACE_LIST¡£The WSAIoctl interface is also encapsulated in cygwin and placed in /usr/include/w32api/, libs place in /usr/lib/w32api/ws2_32 . 

   The code implemented by this interface can work correctly after compilation in MinGW and MSVC environments. But the error code of 10045 is returned after cygwin compiles. I have tested on different win10 hosts with different cygwin1.dll£¬ but it still returned 10045£¨not supported£©.

Cygwin winsup/cygwin/fhandler/socket_inet.cc also called WSAIoctl£¬it should workable, I don't understand why return error. 

I am new to cygwin£¬locating the issue was a bit difficult for me and hope to be able to get your help and response. 

   Thank you very much




The system environment and test code is as follows:

      host:  windows 10  (17134)

      cygwin version:   3.3.5

      gcc version:       11.3.0

gcc cmd:  gcc -C test.c -o test.exe -lws2_32

minGw cmd:  x86_64-w64-mingw32-gcc  test.c -o test.exe -lws2_32




test code is very simple, just like this:




#include <winsock2.h>

#include <ws2tcpip.h>




int main (int argc, char *argv[]){

    int s = SOCKET_ERROR;

    INTERFACE_INFO IOInfo[16];

    int ByteRet = 0;

    WSADATA wsa;

    int err = 0;

    

    if (WSAStartup (MAKEWORD(2,2), &wsa) != 0) {

        return -1;

    }

    s = WSASocket (AF_INET, SOCK_DGRAM, IPPROTO_IP, 0, 0, 0);

    if (s == SOCKET_ERROR){

        return -1;

    }

    err = WSAIoctl (s, SIO_GET_INTERFACE_LIST, 0 ,0 ,&IOInfo, sizeof (IOInfo), &ByteRet, 0 ,0);

   if (err != 0) {

      err = WSAGetLastError ();

       printf ("err:%d\r\n", err);

       return -err;

  }

    return 0;

}



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