From owner-freebsd-questions@FreeBSD.ORG  Wed Mar  2 22:26:30 2005
Return-Path: <owner-freebsd-questions@FreeBSD.ORG>
Delivered-To: freebsd-questions@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id EFFBE16A4CE
	for <freebsd-questions@freebsd.org>;
	Wed,  2 Mar 2005 22:26:30 +0000 (GMT)
Received: from web54002.mail.yahoo.com (web54002.mail.yahoo.com
	[206.190.36.226])
	by mx1.FreeBSD.org (Postfix) with SMTP id 5D8D743D31
	for <freebsd-questions@freebsd.org>;
	Wed,  2 Mar 2005 22:26:30 +0000 (GMT)	(envelope-from pm940@yahoo.com)
Received: (qmail 82199 invoked by uid 60001); 2 Mar 2005 22:26:29 -0000
Comment: DomainKeys? See http://antispam.yahoo.com/domainkeys
DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws;
	s=s1024; d=yahoo.com;
	b=UE9jhUCRTaCwgY51MM/JOSy63OfzDkZyHBdPeZju5/NOR7O7moZKCWhkKwgwWSPB2U/9ksjAeu3VZBvU5YtLOo4YhQZ50rLV5UBN4GqhNOcUbDwZrJMnNVgf2lzRxH0HSvVGuEQiqPlzz90Z+NSPptLQnqrDdpEhWlYysMcYIrk=
	;
Message-ID: <20050302222629.82196.qmail@web54002.mail.yahoo.com>
Received: from [69.237.122.17] by web54002.mail.yahoo.com via HTTP;
	Wed, 02 Mar 2005 14:26:29 PST
Date: Wed, 2 Mar 2005 14:26:29 -0800 (PST)
From: Nine Forty <pm940@yahoo.com>
To: freebsd-questions@freebsd.org
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Subject: SUN_LEN(addr) vs. SUN_LEN(addr) + 1.
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: User questions <freebsd-questions.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>,
	<mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions>
List-Post: <mailto:freebsd-questions@freebsd.org>
List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>,
	<mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 02 Mar 2005 22:26:31 -0000


/usr/include/sys/un.h says:

/*
 * Definitions for UNIX IPC domain.
 */
struct  sockaddr_un {
        u_char  sun_len;                /* sockaddr
len including null */
        u_char  sun_family;             /* AF_UNIX */
        char    sun_path[104];          /* path name
(gag) */
};


... but it also says:

/* actual length of an initialized sockaddr_un */
#define SUN_LEN(su) \
        (sizeof(*(su)) - sizeof((su)->sun_path) +
strlen((su)->sun_path))


Which doesn't include the nul at the end of sun_path.


When calling bind(2) or sendmsg(2), is SUN_LEN(addr)
valid, or should it be SUN_LEN(addr) + 1?  Various
programs under /usr/src use plain SUN_LEN(addr).

Is there a problem with the comment, the macro, the
applications, or none of the above?


Thanks.



	
		
__________________________________ 
Celebrate Yahoo!'s 10th Birthday! 
Yahoo! Netrospective: 100 Moments of the Web 
http://birthday.yahoo.com/netrospective/