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Date: Sun, 15 Apr 2001 22:52:27 +0200
From: Corinna Vinschen <cygwin AT cygwin DOT com>
To: cygwin <cygwin AT cygwin DOT com>
Subject: Re: cvs broken on win2k after recent cygwin upgrade: "The descriptor is a file, not a socket"
Message-ID: <20010415225227.W20490@cygbert.vinschen.de>
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In-Reply-To: <20010415153631.D9015@redhat.com>; from cgf@redhat.com on Sun, Apr 15, 2001 at 03:36:31PM -0400

On Sun, Apr 15, 2001 at 03:36:31PM -0400, Christopher Faylor wrote:
> On Sun, Apr 15, 2001 at 06:44:50PM +0200, Corinna Vinschen wrote:
> >On Sun, Apr 15, 2001 at 09:07:28AM -0400, Christopher Faylor wrote:
> >> On Sun, Apr 15, 2001 at 09:22:58AM +0100, Henry S. Thompson wrote:
> >> >Thanks for the observations.  Seems to me to confirm Corinna's
> >> >original belief that somehow Cygwin is getting the wrong WINSOCK
> >> >library, even though the right one is available.
> >> 
> >> Cygwin uses wsock32.dll.
> >
> >That's not quite correct. Cygwin uses ws2_32.dll if available.
> >The reason is the Winsock2 functionality used for duplicating
> >sockets. The old method is still implemented as a fallback, though.
> 
> How is that implemented?  I don't see it in the code.  Where is
> that implemented below?

It's not that obvious. Since WsaStartup is called with a requested
version of 2.2 in wsa_init(), the wsock32 code asks if winsock 2 is
available on the system. If so, it will be used. The reason for
loading ws2_32 explicitly in Cygwin is that the function pointers of
the special winsock 2 functions couldn't be resolved otherwise.

> Also the two tests for ws32_handle and wsock32_handle look reversed.
> 
> cgf
> 
> LoadDLLinitfunc (wsock32)
> {
>   extern void wsock_init ();
>   HANDLE h;
> 
>   if ((h = LoadLibrary ("wsock32.dll")) != NULL)
>     wsock32_handle = h;
>   else if (!wsock32_handle)
>     api_fatal ("could not load wsock32.dll.  Is TCP/IP installed?");
>   else
>     return 0;           /* Already done by another thread? */
> 
>   if (!ws2_32_handle) 	/* IS THIS CORRECT? */
>     wsock_init ();

It is. WsaStartup should only be called once regardless whether the
first winsock function is a version 1.1 or version 2 function. The
wsa_init function is only called if it's not already called from the
other entry point.

Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Developer                                mailto:cygwin AT cygwin DOT com
Red Hat, Inc.

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