From owner-freebsd-hackers Tue Jul 13 7:41:39 1999 Delivered-To: freebsd-hackers@freebsd.org Received: from labinfo.iet.unipi.it (labinfo.iet.unipi.it [131.114.9.5]) by hub.freebsd.org (Postfix) with SMTP id D102F1531F; Tue, 13 Jul 1999 07:41:34 -0700 (PDT) (envelope-from luigi@labinfo.iet.unipi.it) Received: from localhost (luigi@localhost) by labinfo.iet.unipi.it (8.6.5/8.6.5) id OAA08560; Tue, 13 Jul 1999 14:12:51 +0200 From: Luigi Rizzo Message-Id: <199907131212.OAA08560@labinfo.iet.unipi.it> Subject: Re: Why 'dd' does not seek over 'char' devs (specifically raw disk To: green@FreeBSD.org (Brian F. Feldman) Date: Tue, 13 Jul 1999 14:12:51 +0200 (MET DST) Cc: luigi@iet.unipi.it, hackers@FreeBSD.org In-Reply-To: from "Brian F. Feldman" at Jul 13, 99 10:35:58 am X-Mailer: ELM [version 2.4 PL23] Content-Type: text Content-Length: 1193 Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG > > Hi, i have a question. > > > > Why 'dd' does not seek over 'char' devs (specifically raw disk partitions). > > Not all character devices support seeking. So, we work with the LCD... > Sorry, I don't like this either. It would be better, maybe, just to fix > character devices. couldn't we first try lseek and only do the reads on char devs where the lseek fails ? > You certainly make a good case. modify your local copy of dd to do > what you want. generally this is not the kind of things you can do when your system has already gone bad (this was a laptop's disk...) > > > > I notice that on output lseek _is_ used also on char devices. > > And how else would you do it? ok, stupid observation! cheers luigi -----------------------------------+------------------------------------- Luigi RIZZO, luigi@iet.unipi.it . Dip. di Ing. dell'Informazione http://www.iet.unipi.it/~luigi/ . Universita` di Pisa TEL/FAX: +39-050-568.533/522 . via Diotisalvi 2, 56126 PISA (Italy) http://www.iet.unipi.it/~luigi/ngc99/ ==== First International Workshop on Networked Group Communication ==== -----------------------------------+------------------------------------- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message