libgpib: Permission denied

David Gravereaux <[email protected]> Sun, 3 Aug 2025 15:53:16 -0700

Newsgroups	gmane.linux.hardware.gpib.general
Message-ID	<[email protected]>

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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