Udev + /dev/rtf

Udev + /dev/rtf

[Albert Veli]

Hi,

I have a question about udev and /dev/rtf* device nodes. They are needed
to interact with the module rtai_fifos.ko (part of RTAI, a Linux
realtime extension).

But I'm not sure if rtai_fifos.ko support sysfs or not.

/sys/module/rtai_fifos/ gets created when I load the module but there is
not much in it.

The output of 'udevinfo -a -p /sys/module/rtai_fifos/' is just:

  looking at class device '/sys/module/rtai_fifos':
    SUBSYSTEM="unknown"
    SYSFS{refcnt}="0"

When this module gets loaded, it would be ideal if the device
nodes /dev/rtf[0-9] could be created.

crw-rw-rw-  1 root root 150, 0 2006-03-03 14:05 /dev/rtf0
crw-rw-rw-  1 root root 150, 1 2006-03-03 14:05 /dev/rtf1
...
crw-rw-rw-  1 root root 150, 9 2006-03-03 14:05 /dev/rtf9

If I create the device nodes manually with mknod they get erased when
the box is rebooted.


Does anobody know if it is possible to make these device nodes
persistent with udev somehow?

(or even better, created when the module is loaded and deleted when the
module is unloaded)

If it is possible, how should a /etc/udev/rules.d rules file look like?

I tried with:

DRIVER="rtai_fifos", NAME="rtf%n"

But nothing happened..


Regards, Albert



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Re: Udev + /dev/rtf

[Marco d'Itri]

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On Mar 03, Albert Veli <Albert.Veli@afconsult.com> wrote:

> But I'm not sure if rtai_fifos.ko support sysfs or not.
If no device at all is being created, then obviously not.
Ask the RTAI maintainers to fix the driver.

> /sys/module/rtai_fifos/ gets created when I load the module but there is
> not much in it.
This is not the right path, the RTAI files will have to appear in
/sys/class/.

-- 
ciao,
Marco

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