Date: Mon, 30 Sep 1996 13:49:44 +0100 (BST) From: Doug Rabson <dfr@render.com> To: Bruce Evans <bde@zeta.org.au> Cc: dfr@freefall.freebsd.org, freebsd-lite2@freefall.freebsd.org Subject: Re: cvs commit: src/sys/miscfs/deadfs dead_vnops.c src/sys/miscfs/specfs spec_vnops.c Message-ID: <Pine.BSF.3.95.960930134632.10204B-100000@minnow.render.com> In-Reply-To: <199609301220.WAA17001@godzilla.zeta.org.au>
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On Mon, 30 Sep 1996, Bruce Evans wrote: > > Branch: sys/miscfs/deadfs LITE2 > > Modified: sys/miscfs/deadfs dead_vnops.c > > Log: > > Restore FreeBSD behaviour for dead_read. > > I prefer the Lite2 behaviour. The tty driver already implements it for > disconnected but unrevoked ttys, so applications must be used to it. > (POSIX allows either EOF or EIO for reads on disconnected ttys.) > Disconnection should be implemented using revoke() to free the physical > tty. The tricky part is marking the vnode with the VISTTY flag. This was done by having d_type == D_TTY for the cdevsw of the tty and checking that in specfs_open. Since ttys don't have a bdevsw and there was no handy d_flags to use instead of d_type in cdevsw, I couldn't know whether the device was a tty and set the VISTTY flag. I left the lite2 code there conditionally if you can think of a way to make it work. -- Doug Rabson, Microsoft RenderMorphics Ltd. Mail: dfr@render.com Phone: +44 171 734 3761 FAX: +44 171 734 6426
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