Messages in this thread | | | Date | Mon, 13 Feb 2006 09:50:46 -0800 | From | Greg KH <> | Subject | Re: CD writing in future Linux (stirring up a hornets' nest) |
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On Mon, Feb 13, 2006 at 05:49:11PM +0100, Olivier Galibert wrote: > On Sun, Feb 12, 2006 at 10:24:12PM -0800, Greg KH wrote: > > On Sun, Feb 12, 2006 at 10:14:06PM +0100, Olivier Galibert wrote: > > > On Sun, Feb 12, 2006 at 08:46:33AM -0800, Greg KH wrote: > > > > On Sun, Feb 12, 2006 at 01:04:51PM +0100, Olivier Galibert wrote: > > > > > You need to call udevinfo for that, or parse /dev/.udev/*. Do you > > > > > think it would be possible to have hotplug/udev/whatever exists in the > > > > > future to give that information back in the kernel and have it appear > > > > > in sysfs? > > > > > > > > No. Why would it when it is very simple to query udevinfo for that? > > > > > > In order not to depend on a userland package for the kernel service of > > > device enumeration? It's udevinfo now, what will it be in two years? > > > > WTF? You are depending on that same program to create your device > > nodes. If you don't want to use that program to do it, then use > > something else, or use a static device tree, which works like always. > > Funnily enough, my, say, mp3 usb key sync system would like to run as > non-root and does not want to know or care about what program creates > the device nodes. Too bad this otherwise beautiful and useful sysfs > is crippled by design.
Huh? What sysfs design flaw is that?
You can run your mp3 usb ksy sync system as non-root just fine, I do just that. When my device is plugged in, a udev rule runs a script that changes users and resyncs my device.
But that has nothing to do with sysfs at all.
> > sysfs exports everything that userspace needs to know, if it wants to > > create a device node to talk to that specific device. udev used it to > > create your /dev tree, while other programs use it to create temporary > > device nodes to do other things to your devices. Either way, the kernel > > doesn't know, or care what you call those device nodes. > > You mean root is mandatory to talk with devices, whatever they are?
Not at all. You only have to be root to create a device node, nothing new there.
thanks,
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