Date: Tue, 13 Jul 1999 14:12:51 +0200 (MET DST) From: Luigi Rizzo <luigi@labinfo.iet.unipi.it> To: green@FreeBSD.org (Brian F. Feldman) Cc: luigi@iet.unipi.it, hackers@FreeBSD.org Subject: Re: Why 'dd' does not seek over 'char' devs (specifically raw disk Message-ID: <199907131212.OAA08560@labinfo.iet.unipi.it> In-Reply-To: <Pine.BSF.4.10.9907131034360.76301-100000@janus.syracuse.net> from "Brian F. Feldman" at Jul 13, 99 10:35:58 am
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> > 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
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