Re: Mystery empty file

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On 6/6/19 14:25, Samuel Sieb wrote:
On 6/6/19 11:11 AM, pmkellly@xxxxxxxxxxxx wrote:
On 6/6/19 13:45, Adam Williamson wrote:
On Thu, 2019-06-06 at 11:15 -0600, Chris Murphy wrote:
On Thu, Jun 6, 2019 at 9:49 AM Richard Ryniker <ryniker@xxxxxxxxxxxx> 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 ?


I just tried permissive mode with the same result. I've just looked through of the "files" in debug and they are all empty; so I'm guessing that the kernel folks turned this off.

By empty, do you mean there's no content, or that you get a permission error as above?
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when operating as root the files show as 0 bytes and I get "Operation not permitted" when I try cat.


	Have a GReat Day!

	Pat	(tablepc)
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