From owner-freebsd-current  Wed Nov 28 10: 2:38 2001
Delivered-To: freebsd-current@freebsd.org
Received: from alcatraz.iptelecom.net.ua (alcatraz.iptelecom.net.ua [212.9.224.15])
	by hub.freebsd.org (Postfix) with ESMTP
	id B91D437B417; Wed, 28 Nov 2001 10:02:27 -0800 (PST)
Received: from ipcard.iptcom.net (ipcard.iptcom.net [212.9.224.5])
	by alcatraz.iptelecom.net.ua (8.9.3/8.9.3) with ESMTP id LAA62092;
	Tue, 27 Nov 2001 11:03:07 +0200 (EET)
	(envelope-from sobomax@FreeBSD.org)
Received: from vega.vega.com (h199.229.dialup.iptcom.net [212.9.229.199])
	by ipcard.iptcom.net (8.9.3/8.9.3) with ESMTP id LAA91801;
	Tue, 27 Nov 2001 11:00:56 +0200 (EET)
	(envelope-from sobomax@FreeBSD.org)
Received: from FreeBSD.org (big_brother.vega.com [192.168.1.1])
	by vega.vega.com (8.11.6/8.11.3) with ESMTP id fAR90PY28419;
	Tue, 27 Nov 2001 11:00:25 +0200 (EET)
	(envelope-from sobomax@FreeBSD.org)
Message-ID: <3C0356C9.C1F33D8F@FreeBSD.org>
Date: Tue, 27 Nov 2001 11:03:05 +0200
From: Maxim Sobolev <sobomax@FreeBSD.org>
Organization: Vega International Capital
X-Mailer: Mozilla 4.79 [en] (Windows NT 5.0; U)
X-Accept-Language: en,uk,ru
MIME-Version: 1.0
To: Garrett Wollman <wollman@khavrinen.lcs.mit.edu>
Cc: "Andrew R. Reiter" <arr@FreeBSD.org>, freebsd-current@FreeBSD.org
Subject: Re: libfetch kqueue patch
References: <20011126201312.A75451@walton.maths.tcd.ie>
		<Pine.NEB.3.96L.1011126152347.97819A-100000@fledge.watson.org> <200111262032.fAQKWpY21910@khavrinen.lcs.mit.edu>
Content-Type: text/plain; charset=x-user-defined
Content-Transfer-Encoding: 7bit
Sender: owner-freebsd-current@FreeBSD.ORG
Precedence: bulk
List-ID: <freebsd-current.FreeBSD.ORG>
List-Archive: <http://docs.freebsd.org/mail/> (Web Archive)
List-Help: <mailto:majordomo@FreeBSD.ORG?subject=help> (List Instructions)
List-Subscribe: <mailto:majordomo@FreeBSD.ORG?subject=subscribe%20freebsd-current>
List-Unsubscribe: <mailto:majordomo@FreeBSD.ORG?subject=unsubscribe%20freebsd-current>
X-Loop: FreeBSD.ORG

Garrett Wollman wrote:
> 
> <<On Mon, 26 Nov 2001 15:27:45 -0500 (EST), "Andrew R. Reiter" <arr@FreeBSD.org> said:
> 
> > As from OpenBSD (in shorter form):
> 
> >       fd_set *fds = calloc(howmany(fd+1, NFDBITS), sizeof(fd_mask));
> 
> But this is not portable.  The application is not allowed to assume
> anything about the structure of an fd_set, or the existence of a type
> `fd_mask', or the existence of a macro `howmany' (which is actually
> prohibited).  The only portable (in the sense of officially
> standardized) interface that doesn't suffer from this problem is
> poll().

This answers your original concern - convert it to use poll(2) instead
of select(2) and you will be safe from the "out of default fd_set"
without loosing portability.

-Maxim

To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-current" in the body of the message