[CentOS] User access to /dev/ttyUSB0

John jses27 at gmail.com
Wed Dec 3 12:02:10 UTC 2008


> [mailto:centos-bounces at centos.org] On Behalf Of Frank Cox
> Sent: Wednesday, December 03, 2008 3:50 AM
> To: centos at centos.org
> Subject: [CentOS] User access to /dev/ttyUSB0
> 
> I have been trying to get an EVDO modem to work with Centos 
> 5.  I can make it
> dial out with wvdial only when I'm the root user.  Otherwise 
> I get this error:
> 
> Cannot open /dev/ttyUSB0: Device or resource busy
> 
> I added the user to the uucp group.
> 
> crw-rw---- 1 root uucp 188,  0 Dec  3 02:30 /dev/ttyUSB0
> crw-rw---- 1 root uucp 188,  1 Dec  3 02:30 /dev/ttyUSB1
> crw-rw---- 1 root uucp 188,  2 Dec  3 02:30 /dev/ttyUSB2
> crw-rw---- 1 root uucp 188,  3 Dec  3 02:30 /dev/ttyUSB3
> 
> What have I missed?

Hmm Lets see here... system-config-network Select (highlight) your PPP
Adapter, then click on Edit. That will be under the Devices Tab. Next Look
under the General Tab. Place a Check in "Allow all Users to enable or
disable the Device".

JohnStanley



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