Date: Mon, 6 Oct 2003 23:20:06 +0000 From: Mark Valentine <mark@valentine.me.uk> To: wollman@khavrinen.lcs.mit.edu (Garrett Wollman), phk@phk.freebsd.dk Cc: arch@freebsd.org Subject: Re: Alignment of disk-I/O from userland. Message-ID: <200310062220.h96MK7PI061345@dotar.thuvia.org> In-Reply-To: <mailpost.1065476850.59321@thuvia.org>
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> From: wollman@khavrinen.lcs.mit.edu (Garrett Wollman) > Date: Mon 6 Oct, 2003 > Subject: Re: Alignment of disk-I/O from userland. > I believe that the Standard allows practically arbitrary restrictions > on what may be done with devices (since most devices, aside from ttys, > are outside the scope of the Standard anyway). It says that read() > may fail if: > > [ENXIO] A request was made of a nonexistent device, or the request > was outside the capabilities of the device. Hmm, but it doesn't say: [EDOOFUS] A request was made of a nonexistent device, or the request was outside the capabilities of the device driver writer. It would be reasonable to enforce such restrictions on a raw device if we still had block devices around, but it doesn't seem reasonable now. Cheers, Mark. -- "Tigers will do ANYTHING for a tuna fish sandwich." "We're kind of stupid that way." *munch* *munch* -- <http://www.calvinandhobbes.com>;
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