Mailing-List:	contact cygwin-help AT sourceware DOT cygnus DOT com; run by ezmlm
List-Subscribe:	<mailto:cygwin-subscribe AT sources DOT redhat DOT com>
List-Archive:	<http://sources.redhat.com/ml/cygwin/>
List-Post:	<mailto:cygwin AT sources DOT redhat DOT com>
List-Help:	<mailto:cygwin-help AT sources DOT redhat DOT com>, <http://sources.redhat.com/ml/#faqs>
Sender:	cygwin-owner AT sources DOT redhat DOT com
Delivered-To:	mailing list cygwin AT sources DOT redhat DOT com
Date:	Wed, 31 Jan 2001 17:17:14 +0200
Message-Id:	<200101311517.RAA12062@linux.>
From:	"Ehud Karni" <ehud AT unix DOT simonwiesel DOT co DOT il>
To:	vic DOT cross AT veejoe DOT com DOT au
Subject:	Re: Possible problems in select() under Win95/98/ME
CC:	cygwin AT cygwin DOT com
In-reply-to:	<004801c08b79$cb06d460$1300a8c0@veejoe.com.au> (message from Vic
	Cross on Wed, 31 Jan 2001 21:34:37 +1000)
Organization:	Simon & Wiesel Insurance agency
Reply-to:	ehud AT unix DOT simonwiesel DOT co DOT il
References:	<004801c08b79$cb06d460$1300a8c0 AT veejoe DOT com DOT au>
X-Mailer:	Emacs 20.7.1 rmail (send-msg 1.104)
MIME-Version:	1.0

On Wed, 31 Jan 2001 21:34:37 +1000, Vic Cross
    <vic DOT cross AT veejoe DOT com DOT au> wrote:
> 
> The usual process of building a file descriptor set (containing the
> file descriptors for the listener socket and any connected clients)
> and entering a blocking select() call works flawlessly under Linux,
> but under Cygwin the select() appears to ignore the connected clients 
> -- that is, select() does not unblock for incoming data on a client, 
> and a new connection must be initiated to force select() to unblock
 [snip]

I have written a small proxy that use blocking select() and it works
fine on W95/98 (not checked on ME). I've checked ssh and it is also
working with blocking select (it is in packet.c). So, at least in some
cases, select() is working on W95/98.

> This workaround uncovered another problem in select() -- every time
> select() returns, a TCP loopback connection is created and sits in
> TIME_WAIT status until it ages out.  Various methods and tests have
> shown that the spurious connection is *definitely* co-incident with
> the return from select().

I checked with netstat (on W95) and there seems to be some (2 to 4)
loopback connections created. I never so more than 4 connections.

As it happens I had time-out in my proxy for the select(), set to 30
seconds, I changed it to 1 and 3 second and ran my proxy. There seem
to be loopback connection created for each select() return. Then I had
some net activity (not related to the proxy or Cygwin) and the creation
of the loopback connection CEASED !. I then changed the time-out to
300 milliseconds, and no loopback connection was created.

Ehud.


-- 
 @@@@@@ @@@ @@@@@@ @    @   Ehud Karni  Simon & Wiesel  Insurance agency
     @    @      @  @@  @   Tel: +972-3-6212-757    Fax: +972-3-6292-544
     @    @ @    @ @  @@    (USA)  Fax  and  voice  mail:  1-815-5509341
     @    @ @    @ @    @        Better     Safe     Than     Sorry
 http://www.simonwiesel.co.il    mailto:ehud AT unix DOT simonwiesel DOT co DOT il

--
Want to unsubscribe from this list?
Check out: http://cygwin.com/ml/#unsubscribe-simple

- Raw text -