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Old 10-24-2006, 01:22 PM   #1
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Registered: Oct 2006
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user-space notification of USB device attached/detached

I have a user-space application that needs to be notified when a USB device has just been attached or detached (hot plugged/unplugged). Can someone tell me how to setup or register for such a notification? I'm running embedded linux 2.6.

I want to be notified of any type of USB device. But just for starters, I'm using a USB Memory Stick. I've loaded all of the necessary drivers:
modprobe ehci-hcd
modprobe usb-storage
modprobe sg
modprobe sd_mod
modprobe vfat
modprobe msdos
modprobe nls_iso8859-1
modprobe nls_cp437
and when I attach or detach the USB Memory Stick, I do see debug traces indicating the attachment/detachment. I can also manually mount the device (/dev/sda1) and read and write files on it. Now, I just need my user-space app to automatically get the attach/detach notifications so it knows when it can read and write the USB Memory Stick.


Last edited by rhardy; 10-24-2006 at 02:02 PM.
Old 10-24-2006, 03:17 PM   #2
Registered: Oct 2006
Posts: 460

Rep: Reputation: 31
i'm just now trying to figure out how to do this the new way too but i think that hald exports some D-BUS signals like
void DeviceAdded(string udi)
void DeviceRemoved(string udi)

there appears to be wrappers for this stuff in lots of libs like glib and whatnot
i saw some python bindings that i coppied for further reference that looked loke this
hal_manager = dbus.Interface(hal_manager_obj,

hal_manager.connect_to_signal('DeviceAdded', device_added_callback)
you can also add signal recievers directly to the bus for services that are not registered already


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