Re: [opencbm-user] Errors compiling opencbm on Linux.

[Wolfgang M. <wo...@ne...>]

Hello Spiro,

Spiro Trikaliotis schrieb:
> [...]
> The udev rule is executed as expected:
> 
>> luca@c65:~/opencbm/cbm4win2/cbm4linux/sys/linux$ ll /dev/cbm
>> crw-rw-r-- 1 root users 10, 177 2007-11-03 19:45 /dev/cbm
> 
> These are exactly the permissions you should have according to the rule!
> 
>> luca@c65:~/opencbm/cbm4win2/cbm4linux/sys/linux$ id
>> uid=1000(luca) gid=1000(luca) 
>> groups=20(dialout),24(cdrom),25(floppy),29(audio),30(dip),44(video),1000(luca),1002(vboxusers)
> 
> You must "only" add yourself to the "users" group, or change the
> permissions in the rule. Thus, either add yourself to the "users" group
> (as you have already done), or change the line
> 
>   KERNEL=="cbm", GROUP="users", MODE="0664"
> 
> to
> 
>   KERNEL=="cbm", GROUP="luca", MODE="0664"
> 
> to give the group "luca" the permission (and no-one else),
> or to
> 
>   KERNEL=="cbm", GROUP="users", MODE="0666"
> 
> to allow everyone to use opencbm.
> 
> I will have to add a specific section to this into the documentation.
> 
> 
>> So, i added my accout "luca" to the group user, and then i run 'newgrp 
>> users', now i my account is able to use /dev/cbm device. Not sure it is 
>> a sensible way to fix the error though.
> 
> In fact, it is exactly the way it was expected to work. I see, this
> shoujld be better documented. In fact, I totally forgot about this
> myself.

I don't know anything about the concepts of users and
groups regarding Linux kernel drivers, but isn't it
possible to declare more than one user and/or group to
have specific access modes for the driver?

That way Luca could list every single user that is
allowed to have access to the cbm module. Not that I
would recommend that here, but worth to be documented,
if this is a possible option.


Womo