mdev.conf

[Bernhard Reutner-Fischer]

On Tue, Aug 26, 2008 at 03:32:41PM +0200, gb wrote:
>Thank you 
>but i've got a problem ...
>
>Le dimanche 24 août 2008 à 22:23 +0200, Tito a écrit :
>> On Sunday 24 August 2008 21:31:21 gb wrote:
>> > hello
>> > 
>> > In mdev.conf there are three space-separated fields 
>> > - a regex,
>> > - a numeric colon-separated uid:gid pair, 
>> > - octal permissions
>> > 
>> > Is rules exists to know uid:gid numbers associate with device ?
>> > 
>> > example : # /etc/mdev.conf
>> > 
>> > null 0:0 777
>> > zero 0:0 666
>> > the owner and the group of devices "null" and "zero" is "root:root". 
>> > it 's easy with 0:0
>> > 
>> > but for console .....
>> > console 0:5 0600    
>> > owner is root but group is "5" ?
>> > 
>> > Is here an "official" name of the number 5 ? What it is this name ?
>> > Where can i find this information ?
>> > 
>> > Thank for help.
>> > 
>> > Gauthier
>> > 
>> Hi,
>> look at /etc/group file of your distro.
>> ---snip----
>> root:x:0:
>> daemon:x:1:
>> bin:x:2:
>> sys:x:3:
>> adm:x:4:
>> tty:x:5:
>> disk:x:6:
>> lp:x:7:
>> mail:x:8:
>
>For example with this :
>
>in my mdev.conf there is : 
>---------------
>...
>kmem 0:9 000
>mem 0:9 0640
>port 0:9 0640
>...
>---------------
>if i use : 
>
>> news:x:9:
>
>/dev/kmem, /dev/port and  /dev/mem are owned by the group news !? 
>
>Is it ok ?

there is a group kmem (gid 15 below) for these. I wouldn't use group
"news" for these 3 entries..

>> uucp:x:10:
>> man:x:12:
>> proxy:x:13:
>> kmem:x:15:
>> dialout:x:20:
>> fax:x:21:
>> voice:x:22:
>> cdrom:x:24:
>> floppy:x:25:
>> tape:x:26:
>> sudo:x:27:
>> audio:x:29:
>> dip:x:30:
>> www-data:x:33:
>> backup:x:34:
>> operator:x:37:
>> list:x:38:
>> irc:x:39:
>> src:x:40:
>> gnats:x:41:
>> shadow:x:42:
>> utmp:x:43:
>> video:x:44:
>> ----snip---------
>> 
>is this list is the same for all distro ?

No, the groups are up to you. A distro can use whatever gr_name and
gr_gid they want-
>
>who decide to make this relation between group (gid or name) and
>devices ?

Not sure, but i think these are not mandated by a standard.