[clue-tech] help with: "fifo: Permission denied" when using acpi_fakekey as non-root

[Jim Ockers]

Hi Mike,

FIFOs are usually unix pipe special files. Here is an example:

[root at agadez tmp]# touch this_is_a_normal_file
[root at agadez tmp]# mknod this_is_a_fifo p
[root at agadez tmp]# ls -al this*
prw-r--r-- 1 root root 0 Feb 11 07:16 this_is_a_fifo
-rw-r--r-- 1 root root 0 Feb 11 07:16 this_is_a_normal_file

As you can see the FIFO has permissions associated with it just like any 
other file. Please check the permissions on your FIFO using ls -al and 
see who has permission to write to it and read from it. Here is an 
example of me changing the permissions on my FIFO file:

[root at agadez tmp]# chmod 666 this_is_a_fifo
[root at agadez tmp]# ls -al this_is_a_fifo
prw-rw-rw- 1 root root 0 Feb 11 07:16 this_is_a_fifo

I hope this helps,
Jim

Mike Jensen wrote:
> Been lurking around for a while, but never posted before.  Sorry to have 
> my first post be a help request.
>
> I am trying to get the volume up/down/mute key to work on my Lenovo 
> T400.  The distro is Debian Squeeze, fully updated, amd64.  My volume 
> keys don't seem to work, so I traced down /etc/acpi/volupbtn.sh (and 
> others), and noticed that it was using acpi_fakekey....when I run it as 
> such in root, there is no problems, it returns fine.  But when I run the 
> same thing as a normal user I get: fifo: Permission denied
>
> Let me know if there is any more information I can provide.  I have 
> searched around but have not seen this percise problem before.  Thanks 
> in advanced.
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