Messages in this thread |  | | Date | Tue, 15 May 2001 16:14:58 -0400 (EDT) | From | Alexander Viro <> | Subject | Re: LANANA: To Pending Device Number Registrants |
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On Tue, 15 May 2001, James Simmons wrote:
> > only one _device_node_, you can have multiple fd's. In fact, you can, with > > the Linux VFS layer, fairly easily do things like > > > > mknod /dev/fd0 c X Y > > > > and then use > > > > fd = open("/dev/fd0/colourspace", O_RDWR); > > Yipes!! I have to say UNIX has a tendency to teach you ioctl is the only > way. I have never thought outside of the box nor see anyone else in this > manner. This is absolutely brillant!!! I can see alot of possibilties with > this.
The thing being, why thet hell create these device/directory hybrids? Driver can export a tree and we mount it on fb0. After that you have the whole set - yes, /dev/fb0/colourspace, etc. - no problem. And no need to do mknod, BTW. Yes, we'll need to use /dev/fb0/frame for frame itself. BFD...
You see, as soon as you want slightly more structured stuff (deeper than one level) you need the dentry tree, yodda, yodda. IOW, you need a filesystem anyway and it's easy to implement. Want me to do framebufferfs? Would make a nice demo. No majors. No minors. No ioctls. Less code than in current tree. ~3 days to implement.
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