Re: udev/ubuntu problem solved

[Andreas Jellinghaus <aj@dungeon.inka.de>]

On Tuesday 10 July 2007 17:39:24 Kay Sievers wrote:
> What are theses guys smoking? That's so sick to bind-mount
> /dev-directories to /proc! I wouldn't support such a system at all. It
> is totally broken.

I was worried about that too. I guess they made that change so all 
applications get the benefit of the ACL's in /dev/bus/usb without changes
to the source code (i.e. path adjustment).

> Are you using PROGRAM? That is for plugging external program into udev
> to give devices a name or symlink. If you use RUN+=, your program
> never runs before the node and all symlinks are created.

no I'm using RUN+= and I thought this would work the wy you described.
testing on ubuntu edgy (which has udev 108-0ubuntu4) shows this is different.
when I have my loop inside the script I RUN+= I can increase the timeout to 20 
seconds, still it times out as the $DEVICE file is not there. if I have the 
script start the loop in the background then it find the file after 100 ms 
(one sleep).

maybe my diagnosis is a bit off: not the device file is created late, but the 
DEVICE event is processed first, and the other events are in a queue in the 
meantime till my RUN+= script is finished? and some other event triggers the 
creation of /dev/bus/usb/NNN/NNN and it is processes after the event with 
MODALIAS and DEVICE=/proc/bus/usb/NNN/NNN ? that would explain what I'm seing 
too. is this explanation possible?

Thanks,

Andreas

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