From owner-freebsd-hackers Sun Jun 22 23:55:25 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.5/8.8.5) id XAA17189 for hackers-outgoing; Sun, 22 Jun 1997 23:55:25 -0700 (PDT) Received: from sax.sax.de (sax.sax.de [193.175.26.33]) by hub.freebsd.org (8.8.5/8.8.5) with SMTP id XAA17178 for ; Sun, 22 Jun 1997 23:55:16 -0700 (PDT) Received: (from uucp@localhost) by sax.sax.de (8.6.12/8.6.12-s1) with UUCP id IAA01933; Mon, 23 Jun 1997 08:54:20 +0200 Received: (from j@localhost) by uriah.heep.sax.de (8.8.5/8.8.5) id IAA26067; Mon, 23 Jun 1997 08:35:58 +0200 (MET DST) Message-ID: <19970623083558.FD45105@uriah.heep.sax.de> Date: Mon, 23 Jun 1997 08:35:58 +0200 From: j@uriah.heep.sax.de (J Wunsch) To: freebsd-hackers@freebsd.org (FreeBSD hackers) Cc: un_x@anchorage.net (Steve Howe) Subject: Re: direct access References: X-Mailer: Mutt 0.60_p2-3,5,8-9 Mime-Version: 1.0 X-Phone: +49-351-2012 669 X-PGP-Fingerprint: DC 47 E6 E4 FF A6 E9 8F 93 21 E0 7D F9 12 D6 4E Reply-To: joerg_wunsch@uriah.heep.sax.de (Joerg Wunsch) In-Reply-To: ; from Chuck Robey on Jun 22, 1997 21:10:45 -0400 Sender: owner-hackers@freebsd.org X-Loop: FreeBSD.org Precedence: bulk As Chuck Robey wrote: > It really sounds like you ought to go purchase either a beginners Unix > book, or maybe an operating systems textbook, depending on where your > interests lie. Also, Steve should look into the ports collection. bpatch for example can hex-edit arbitrary files including entire devices (the other available hex editors usually can't since they suck the entire device into memory first). For meaningful hex-editing of raw memory, read the handbook section about kernel debugging. Simple port IO is now also possible in DDB, albeit the entire collection of IO instructions should probably be available in a non-inlined fashion there. Of course, Steven, with your proven knowledge level, i would be more than careful in manipulating any bits in either memory or on a device (unless perhaps a DOS floppy). -- cheers, J"org joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE Never trust an operating system you don't have sources for. ;-)