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    SubjectRe: LANANA: To Pending Device Number Registrants


    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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