Re: [Discuss-gnuradio] RTOS and GNU Radio

[Stefan Bruens]

On Thursday 13 August 2009 20:09:55 Jane Chen wrote:
> Hi all,
>
>
> Eric, thank you for your reply.
> I ran the tunnel.py with the username "useSDR"  in group usrp and added
>
> @usrp  - rtprio 50 in the  /etc/security/limits.conf.  
> gr.enable_realtime_scheduling() is in the orignial tunnel.py file.
>
> However, I keep get an error as following:
>
> File "tunnel_original.py", line 78, in open_tun_interface
>     tun = os.open(tun_device_filename, os.O_RDWR)
> OSError: [Errno 13] Permission denied: '/dev/net/tun'

This error is unrelated to the first one.

You dont have permission to create a tun device. Recommended proceeding:

1. install tunctl
2. "sudo chmod 666 /dev/net/tun"
3. "sudo tunctl -u useSDR -n"

steps 2 and 3 have to be repeated after restarting the computer.

This way, you dont have to run tunnel.py as root.

Stefan

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