understanding of sysfs.

[Madhu K]

Hi Greg,

Thanks for your response.


On Tue, May 23, 2017 at 12:04 PM, Greg KH <greg at kroah.com> wrote:

> On Tue, May 23, 2017 at 11:58:31AM +0530, Madhu K wrote:
> > Hi All,
> >
> > why there is no character device entry present in /sys/class? where as
> block
> > and net device entries are present.
>
> I see character devices there, but not the device nodes.  I don't see
> block device nodes there either.
>

If I am wrong please correct me, there is a folder called block in
/sys/class. is block not containing block device nodes?

>



>
> > Not only in /sys/class, for that matter why there is no character device
> > entries present in /sys file system.
>
> What do you exactly mean by "character device entries"?
>

like block and net why there is no char folder

>
> > please help me to understand for what purpose char devices are kept away
> from /
> > sys file system.
>
> Have you read the driver model chapter in the Linux Device drivers book,
> or the in-kernel sysfs documentation?
>
> thanks,
>
> greg k-h
>
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