who sends from the kernel an event to udevd netlink socket?

["Mark Ryden" <markryde@gmail.com>]

Hello,
 I wonder:
In the last versions of udev, which work **WITHOUT** hotplug:
as I understand, there is a udevd daemon which listens on a NETLINK socket
to events which come from the kernel.Suppose I plug to the USB socket
an ov511 webcam; who
sends the "ADD" event to the udevd NETLINK socket?
I had looked at the code of ov511.c
(drivers/usb/media in the kerbnel tree)
I saw that there is creation of sysfs entries
(in ov51x_probe, there is a call to  ov_create_sysfs())
So my question is : is this adding to sysfs is the one that causes sending
an "ADD" event to the user space daemon?

And in case it is : I did not find in sysfs where it is done.
(I looked on both sysfs in usb and fs).
Also grepping for sockaddr_nl under drivers/usb gave no results.

Again , I am talking about the ast versions of udev, which work
**WITHOUT** hotplug: (meaning  /proc/sys/kernel/hotplug is empty).

I am specifically interested to know, in this case of plugging a USB
OV511 webcam ,wherer is the code that we reach which sends the "ADD"
event to the Netlink userspace socket (and if it some place which is 
generci - are all devices handled
this way or are there exceptions ? )

Regards,
Mark


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