Re: libgpib: Permission denied

 Hi David,   The makefile that creates the device node (/dev/gpib0) should have created it with a group "gpib" (see linux-gpib-user/drivers/Makefile.am).You should add yourself to the "gpib" group. (see linux-gpib-user/INSTALL)
Michael
    On Sunday, August 3, 2025 at 06:54:07 PM EDT, David Gravereaux <[email protected]> wrote:  
 
 Hi,

newbie here.  I'm sure this is an RTFM issue.  Please accept my apologies.

OS: Ubuntu 22.04

Linux-GPIB successfully built an installed
gpib-tcl successfully built and installed

$ lspci -ks 05:05.0
05:05.0 Communication controller: National Instruments PCI-GPIB (rev 01)
    Kernel modules: tnt4882

When I run tkcon, load the extension, and do the first open which calls 
ibdev, I get this in stderr:

libgpib: ibBoardOpen failed to open device file /dev/gpib0
libgpib: Permission denied

$ ls -l /dev/gpib0
crw-rw---- 1 root root 160, 0 Aug  3 15:19 /dev/gpib0


The device is owned by root.  I can chown the device, but what is the 
fix so it stays available?
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