From: nobu.nokada@...
Date: 2003-03-19T07:51:57+09:00
Subject: Re: How to get the Windows handle for a socket

Hi,

At Wed, 19 Mar 2003 07:03:09 +0900,
Tom Felker wrote:
> On Windows, I do the following (trying to get a nonblocking socket):
> 
> f=Win32API.new("ws2_32", "ioctlsocket", ["l", "l", "l"], 'i')
> s=TCPServer.new(15000)
> f.call(s.fileno, 2147772030, 1) #FIONBIO

Currently ruby's on Windows (except for bccwin32 in 1.8) use
Winsock, and I don't know whether Winsock and Winsock2 can
work each together.

> This returns 10038, "Not a socket," instead of 0, "Success."  s.fileno
> is 3.  On Windows, sockets are simply handles, which don't need to be
> low integers like 3, and usually aren't.
> 
> What I need is to get the real handle to the socket.  (Or any other way
> to set a socket nonblocking in Windows.)

This might work for mingw32 and mswin32.

  Win32API.new("msvcrt", "_get_osfhandle", "I", "I").call(s.fileno)

> Also, a way to make TCPSocket.new not block would be nice.  I'm trying
> to make a chat program, and it needs to stay responsive, so it uses the
> GUI toolkit's functions to register a callback when the socket is
> selected for.

Note that non-blocking IO doesn't work fine in 1.6, i.e.,
already recevied data will be lost at EAGAIN.  This issue has
been fixed in 1.8.

-- 
Nobu Nakada