[patch] turning devctl into a "multiple openable" device

[Baptiste Daroussin]

Hi all,

With the help of cognet, I wrote a patch to turn devctl into a multiple openable
device, that mean that it will allow to open /dev/devctl in multiple programs,
for example hald and everythings that want to receive notification from the
device won't need to depend on haveing devd running.

here is the patch: 
http://people.freebsd.org/~bapt/devctl_multi_open.diff

regards,
bapt
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