Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!yale!umich!dgsi!dbc
From: dbc@cimage.com (David Caswell)
Newsgroups: comp.unix.internals
Subject: Re: Help with 4.3 mod to kill uninteruptable procs.
Message-ID: <1991Feb25.184853.10487@cimage.com>
Date: 25 Feb 91 18:48:53 GMT
References: <1991Feb19.001941.29928@lynx.CS.ORST.EDU> <4066@stl.stc.co.uk> <19065@rpp386.cactus.org> <1991Feb21.145705.27763@cbnews.att.com>
Reply-To: dbc@dgsi.UUCP (David Caswell)
Organization: Cimage Corp, Ann Arbor, MI
Lines: 13

.n article <1991Feb21.145705.27763@cbnews.att.com> rock@cbnews.att.com (Y. Rock Lee) writes:
.In article <19065@rpp386.cactus.org> jfh@rpp386.cactus.org (John F Haugh II) writes:
.>Just for kicks, imagine some real slow device has been set up to
.>do a DMA transfer to some physical address that is held by the
.>process which is unkillable.  Imagine that you kill that process
.>and it exits.  Imagine the I/O completes and someone elses
.>memory gets trashed.  All that and more ...
.
.Please excuse my ignorance on the block devices (most of the time
.I work on character/streams device). 

It's the character devices that are doing the DMA transfer.  Normal I/O
even if it is character-at-a-time is block I/O.


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