From: Corinna Vinschen <corinna-cygwin@cygwin.com>
To: cygwin@cygwin.com
Subject: Re: Dup'd sockets lose error information
Date: Wed, 23 Apr 2014 15:38:00 -0000 [thread overview]
Message-ID: <20140423153830.GN2339@calimero.vinschen.de> (raw)
In-Reply-To: <20140423142541.156360@gmx.com>
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On Apr 23 16:25, qq qq wrote:
> The following code is a simplified app that was used to test-connect
> to local ports 55000+ (none of which were actually listening) and
> received false-positive "connected" results because Cygwin's dup()
> for socket causes SO_ERROR to be lost. Since FD_SETSIZE is only 64 on
> Cygwin, the app uses dup()'s to lower the descriptors as it checks
> them for completion. There is no such problem on Linux.
> Also, strangely that Cygwin does not accept sin_addr as 0 to connect
> locally (and either localhost or local host IP must be stuffed in
> there, otherwise resulting in the "Cannot assign requested address"
> error).
This is Winsock at work. Cygwin doesn't check the AF_INET address
when calling Winsock's connect, so Winsock's connect itself seems to
have this issue.
As for the SO_ERROR value, I have to check. Thanks for the testcase.
Corinna
--
Corinna Vinschen Please, send mails regarding Cygwin to
Cygwin Maintainer cygwin AT cygwin DOT com
Red Hat
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next prev parent reply other threads:[~2014-04-23 15:38 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-23 14:25 qq qq
2014-04-23 15:38 ` Corinna Vinschen [this message]
2014-04-24 14:14 ` Corinna Vinschen
2014-05-05 9:08 ` Corinna Vinschen
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