Re: Coding problem with sysfs

["Christian Gmeiner" <christian@visual-page.de>]

Hi Greg,

> On Wed, Jun 02, 2004 at 11:21:53AM +0200, Christian Gmeiner wrote:
> > /sys/class/dvb/adapter0:
> > demux0  dvr0  frontend  frontend0  name  net0
>
> The 'dev' file needs to be here.  That's the problem.
Oh i forgot something - my fault:

vdr root # ls -Rl /sys/class/dvb
/sys/class/dvb:
total 0
drwxr-xr-x  5 root root 0 Jun  5 02:22 adapter0

/sys/class/dvb/adapter0:
total 0
drwxr-xr-x  2 root root    0 Jun  5 02:22 demux0
drwxr-xr-x  2 root root    0 Jun  5 02:22 dvr0
-r--r--r--  1 root root 4096 Jun  5 02:22 frontend
-r--r--r--  1 root root 4096 Jun  5 02:22 name
drwxr-xr-x  2 root root    0 Jun  5 02:22 net0

/sys/class/dvb/adapter0/demux0:
total 0
-r--r--r--  1 root root 4096 Jun  5 02:22 adap
-r--r--r--  1 root root 4096 Jun  5 02:22 dev

/sys/class/dvb/adapter0/dvr0:
total 0
-r--r--r--  1 root root 4096 Jun  5 02:22 adap
-r--r--r--  1 root root 4096 Jun  5 02:22 dev

/sys/class/dvb/adapter0/net0:
total 0
-r--r--r--  1 root root 4096 Jun  5 02:22 adap
-r--r--r--  1 root root 4096 Jun  5 02:22 dev



Frontend is missing, but thats, because i switched to new cvs, wicht seams
to have some problems with
my frontend.

>
> What happens if you run
> udevtest /sys/class/dvb/adapter0

vdr root # udevtest /sys/class/dvb/adapter0
version 025
looking at '/class/dvb/adapter0'
configured rule in '/etc/udev/rules.d//10-myrule.rules' at line 2 applied,
'adapter0' becomes 'dvb/adapter%n/%k'
creating device node '/dev/dvb/adapter0/adapter0', major = '250', minor '7', mode = '020660', uid = '0', gid = '27'

>

This is my udev rule:
# dvb devices
SYSFS{adap}="adapter[0-9]*", NAME="dvb/adapter%n/%k"

And this is the result in /dev:

vdr root # ls -Rl /dev/dvb
/dev/dvb:
total 0
drwxr-xr-x  2 root root 0 Jun  5 02:22 adapter0

/dev/dvb/adapter0:
total 0
crw-rw----  1 root video 250, 7 Jun  5 02:22 adapter0
crw-rw----  1 root video 250, 4 Jun  5 02:22 demux0
crw-rw----  1 root video 250, 5 Jun  5 02:22 dvr0
crw-rw----  1 root video 250, 7 Jun  5 02:22 net0


And here is the problem:
vdr root # ls /dev/dvb/adapter0/demux0
/dev/dvb/adapter0/demux0
vdr root # cat /dev/dvb/adapter0/demux0
cat: /dev/dvb/adapter0/demux0: No such device or address

with devfs:
cat /dev/dvb/adapter0/demux0 -> invaild argument

So i can not work/access the device via sysfs :(

Thanks,
Christian




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