Re: [RFC] coldplug - emit hotplug events from sysfs

[Scott James Remnant <scott@ubuntu.com>]

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On Mon, 2005-10-03 at 14:21 +0200, Kay Sievers wrote:

> To play with it, I use this stupid hack in an early init-script and
> it works without udevstart or any other coldplug logic.
> After mounting tmpfs, creating /dev/null, disabling /sbin/hotplug and
> starting udevd, it creates the tty devices, waits for the events to
> finish, then sends out all remaining events to finish asynchronously:
>   ...
>   # regenerate events by triggering sysfs
>   for i in /sys/class/t*/*/uevent; do echo 1 > $i; done
>   # wait for async tty events to finish
>   while [ $(cat /proc/*/status 2> /dev/null | grep -c -E '^Name:.udevd?$') -gt 1 ]; do
>       sleep 0.1
>   done
> 
There's a much better way to do this!  If there's a guarantee that a
"write to uevent" will cause a uevent, you can simply use the udev rules
to make sure that udev has fired for each uevent you caused to be
generated.

No need to grovel for udev processes, etc.

Scott
-- 
Scott James Remnant
scott@ubuntu.com

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