Sounds like you are doing the right thing. One thing I can think of
is the user needs to login again after the permissions are changed.
Also can the user cat /dev/ttyS0 ?
Cheers,
On Fri, Oct 10, 2008 at 11:30:55AM +1100, Erik de Castro Lopo wrote:
> Hi all,
>
> I'm trying to open a serial port which has the following owner
> ship and group permissions:
>
> crw-rw---- 1 root dialout 4, 64 Oct 10 11:05 /dev/ttyS0
>
> from a process being run by a user with uid and gid of X. However,
> user X is also in the dialout group.
>
> However, when the process tried to open /dev/ttyS0 it fails with
> EPERM. I thought X being a member of the group that owns the device
> was sufficent to allow X to open the device.
>
> Obviously if I add world read/write permissions to the device it
> works.
>
> Cluebat please?
>
> Erik
> --
> -----------------------------------------------------------------
> Erik de Castro Lopo
> -----------------------------------------------------------------
> "One of Subversions biggest weaknesses is its lack of adequate internal
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John
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