From owner-freebsd-hackers@FreeBSD.ORG  Sun Apr  8 13:08:51 2012
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Delivered-To: freebsd-hackers@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52])
	by hub.freebsd.org (Postfix) with ESMTP id CCC10106566C;
	Sun,  8 Apr 2012 13:08:51 +0000 (UTC)
	(envelope-from nec556@retena.com)
Received: from resmaa12.ono.com (smtp12.ono.com [62.42.230.20])
	by mx1.freebsd.org (Postfix) with ESMTP id 638B78FC1B;
	Sun,  8 Apr 2012 13:08:50 +0000 (UTC)
Received: from GogPortatil.retena.com (37.11.170.63) by resmaa12.ono.com
	(8.5.113) (authenticated as nec556@retena.com)
	id 4EFDA3B5017E0D89; Sun, 8 Apr 2012 15:08:49 +0200
Message-ID: <4EFDA3B5017E0D89@> (added by postmaster@resmaa12.ono.com)
X-Mailer: QUALCOMM Windows Eudora Version 7.1.0.9
Date: Sun, 08 Apr 2012 15:10:17 +0200
To: Ivan Voras <ivoras@freebsd.org>
From: Eduardo Morras <nec556@retena.com>
In-Reply-To: <CAF-QHFWV+yV3VwY3dhhxzi4=xwrJcUDULW=PyJxQH8Vb=61+Sw@mail.g
	mail.com>
References: <CAF-QHFWV+yV3VwY3dhhxzi4=xwrJcUDULW=PyJxQH8Vb=61+Sw@mail.gmail.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"; format=flowed
X-Antivirus: AVG for E-mail 2012.0.1913 [2411/4921]
Cc: freebsd-hackers@freebsd.org
Subject: Re: Socket buffer usage
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Technical Discussions relating to FreeBSD
	<freebsd-hackers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>, 
	<mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers>
List-Post: <mailto:freebsd-hackers@freebsd.org>
List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
	<mailto:freebsd-hackers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sun, 08 Apr 2012 13:08:51 -0000

At 23:16 07/04/2012, you wrote:
>Hi,
>
>I'm tracking down an obscure bug in my userland program and it might
>have something to do with the way I write&read data through a (Unix
>domain) socket. I'm setting SO_SNDBUF and SO_RCVBUF, and what I'm
>looking for is some way to query the amount of TX & RX buffered / free
>data on a socket. Is there something I can use? I'll even accept
>inspecting kernel structures if explained in detail and can be done on
>a running system.
>
>Alternatively, is there anything else which could cause poll(2) with
>POLLOUT on a socket to return no events ready on such a socket? (my
>expectation being that a socket is always ready to be written to if
>there is buffer space free...).

Setting fd to -1 in pollfd struct resets revents. Perhaps you have 
not setted fd properly.

>_______________________________________________
>freebsd-hackers@freebsd.org mailing list
>http://lists.freebsd.org/mailman/listinfo/freebsd-hackers
>To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.org"