On Thu, 2019-06-06 at 11:15 -0600, Chris Murphy wrote:
On Thu, Jun 6, 2019 at 9:49 AM Richard Ryniker
<ryniker(a)alum.mit.edu> wrote:
> I think you will find the file is not truly empty. /sys is not an actual
> file system, merely an interface to kernel information. There is no
> directory structure that records the length or other attributes of a file,
> as is the case for data on real media such as disks.
>
> If you read the /sys/kernel/debug/usb/devices file, you should find the
> data you seek.
[root@fmac ~]# ls -l /sys/kernel/debug/usb/devices
-r--r--r--. 1 root root 0 Jun 6 10:11 /sys/kernel/debug/usb/devices
[root@fmac ~]# cat /sys/kernel/debug/usb/devices
cat: /sys/kernel/debug/usb/devices: Operation not permitted
[root@fmac ~]#
5.2.0-0.rc3.git1.1.fc31.x86_64
Try it with enforcing=0 ?
--
Adam Williamson
Fedora QA Community Monkey
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