Date: Sun, 26 Jan 1997 13:32:18 -0800 From: David Greenman <dg@root.com> To: Poul-Henning Kamp <phk@critter.dk.tfs.com> Cc: Luigi Rizzo <luigi@labinfo.iet.unipi.it>, swallace@ece.uci.edu, current@FreeBSD.ORG Subject: Re: exec bug Message-ID: <199701262132.NAA08152@root.com> In-Reply-To: Your message of "Sun, 26 Jan 1997 17:48:48 %2B0100." <7583.854297328@critter.dk.tfs.com>
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>In message <199701261336.FAA06928@root.com>, David Greenman writes: > >> ...and just how do you tell the exec code that a page fault that occured >>while it was accessing the image header was "fatal"? The only mechanism we >>have for this is signals, and that doesn't work when you're executing in the >>kernel like this. > >Wouldn't it make sense for the image activator to do a couple of probes >first to see that the data is actually available ? that way it could >fail intelligently ? The problem is that determining page residency might be too high of an overhead, but maybe not. See my last reply to Bruce. -DG David Greenman Core-team/Principal Architect, The FreeBSD Project
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