mdev coldplugging

[Rob Landley]

On Thursday 13 July 2006 12:10 pm, Natanael Copa wrote:
> I'm experimenting with udev, netlink and /sys/*/*/uevent that are used
> in newer kernels.
>
> You can search for uevent files in /sys and trigger events.
>
> for i in `find /sys -name uevent`; do
> 	echo add > $i ;
> done

Ok, so you're telling the system that the device was just hotplugged in.  
Presumably, if mdev is called from /sbin/hotplug (or you echo "/sbin/mdev" 
> /proc/sys/kernel/hotplug) then the kernel would call mdev to handle the add 
event.

> With udev you can then monitor /dev/.udev/queue to detect when all the
> drivers are loaded.
>
> while [ -d /dev/.udev/queue ] ; do
> 	echo -n "."
> 	sleep 1
> done
>
> My question is, is there some way to do the same with busybox mdev?

What exactly are you trying to do?  Your for loop there continues as long as a 
udev temporary directory exists...?

Possibly you want a loop doing:
while /bin/true
do
  x=`./busybox ps`
  x=`echo $x | grep mdev`
  [ -z "$x" ] && break
  echo -n .
  sleep 1
done

That's a wild guess, not having tried it and not quite being clear on what you 
want to accomplish...

Rob
-- 
Never bet against the cheap plastic solution.