Re: [Linux-decnet-user] default_device won't alter

[J M <joh...@ya...>]

--- Ben Armstrong <be...@bg...> wrote:
> On Mon, 2003-03-24 at 17:00, J M wrote:
> > Thanks for the help, but I cannot edit the file. 
> This
> > is why the echo -n won't work.  This is the whole
> > reason for writing to the group, because the
> online
> > docs say to use echo,
> 
> The docs are correct.  That is how it works.
> 
> > but one cannot edit /proc files,
> 
> What leads you to believe this is true?
> 
> > so it makes no sense and there is no sysctl
> variable
> > to change.
> 
> We are obviously missing some part of your problem. 
> Are you trying to
> change the default device as root or as an ordinary
> user?  Observe:
> 
> $ ls -l /proc/sys/net/decnet/
> total 0
> dr-xr-xr-x    7 root     root            0 Mar 24
> 17:33 conf
> -rw-r--r--    1 root     root            0 Mar 24
> 17:33 debug
> -rw-r--r--    1 root     root            0 Mar 24
> 17:33 default_device
> -rw-r--r--    1 root     root            0 Mar 24
> 17:33 di_count
> -rw-r--r--    1 root     root            0 Mar 24
> 17:33 dn_count
> -rw-r--r--    1 root     root            0 Mar 24
> 17:33 dr_count
> -rw-r--r--    1 root     root            0 Mar 24
> 17:33 dst_gc_interval
> -rw-r--r--    1 root     root            0 Mar 24
> 17:33 no_fc_max_cwnd
> -rw-r--r--    1 root     root            0 Mar 24
> 17:33 node_address
> -rw-r--r--    1 root     root            0 Mar 24
> 17:33 node_name
> -rw-r--r--    1 root     root            0 Mar 24
> 17:33 time_wait
> $ echo -n "eth0" >
> /proc/sys/net/decnet/default_device 
> bash: /proc/sys/net/decnet/default_device:
> Permission denied
> $ su -
> # echo -n "eth0" >
> /proc/sys/net/decnet/default_device
> # cat /proc/sys/net/decnet/default_device
> eth0
> 
> Or perhaps the problem is that you're attempting to
> edit with a text
> editor?  You can't do that with /proc because it
> isn't populated with
> static files -- all of the content is dynamically
> generated by procfs. 
> However, cat and echo will work for reading/writing
> in /proc, provided
> your owner/permissions line up with the resource
> you're trying to read
> or modify.
> 
> Ben
Thank you for your response.

Here is the directory:

-rw-r--r--    1 root     root            0 Mar 24
17:22 debug
-rw-r--r--    1 root     root            0 Mar 24
17:22 default_device
-rw-r--r--    1 root     root            0 Mar 24
17:22 di_count
-rw-r--r--    1 root     root            0 Mar 24
17:22 dn_count
-rw-r--r--    1 root     root            0 Mar 24
17:22 dr_count
-rw-r--r--    1 root     root            0 Mar 24
17:22 dst_gc_interval
-rw-r--r--    1 root     root            0 Mar 24
17:22 node_address
-rw-r--r--    1 root     root            0 Mar 24
17:22 node_name
-rw-r--r--    1 root     root            0 Mar 24
17:22 time_wait

All of them have rw for root, and I am the root user. 
For whatever reason, the simple echo -n >
default_device will not populate.  I cannot change it.
 Everything else I can - just not default_device.  I
have no idea why.

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