Date: Sun, 23 Dec 2001 11:20:11 +0100 From: Bernd Walter <ticso@cicely9.cicely.de> To: Matthew Jacob <mjacob@feral.com> Cc: Wilko Bulte <wkb@freebie.xs4all.nl>, freebsd-alpha@FreeBSD.ORG Subject: Re: FreeBSD 4.5 alpha buyglet Message-ID: <20011223102010.GC61241@cicely9.cicely.de> In-Reply-To: <Pine.BSF.4.21.0112230018040.2582-100000@beppo> References: <20011223080046.GB61241@cicely9.cicely.de> <Pine.BSF.4.21.0112230018040.2582-100000@beppo>
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On Sun, Dec 23, 2001 at 12:19:24AM -0800, Matthew Jacob wrote: > > > > What else would you use for loading a 64 bit value? > > > Not if it's not aligned, and because the structure is fully enumerated, it > should be known to be unaligned. Sorry - but I'm completely missing the reason why it should be unaligned. A 64 bit value starts at a n*8 address relative from the structure beginning unless explizit requested otherwise. > > If it starts with the second or later interface I would asume it's because > > several structs are concatenated in the sysctl output and read as one. If > > one of them is not n*8 bytes long you get an alignment offset. But as I > > don't have more debug output than posted on the list I can only guess. > > The structures are all listed in if.h. > > Well- I must be wrong. I'm sure somebody would have fixed soemthing this > egregious. If you look at what Wilko Bulke posted you will notice that the status function gets a 4*n aligned ifm. The first ifm is located at offset 0 from the malloced buf so it should be propper aligned. Sysctl transfers 2 structures for each interface. If the second structure is not n*8 byte in length the next ifm is wrong aligned. This happens in sbin/ifconfig/ifconfig.c and sys/net/rtsock.c -- B.Walter COSMO-Project http://www.cosmo-project.de ticso@cicely.de Usergroup info@cosmo-project.de To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-alpha" in the body of the message
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