[systemd-devel] udev event on usb unpluged

[Tom Yan]

I am not sure about what you mean here. Do you mean that you can't see
any remove event with `udevadm monitor` when you unplug the "cable"?
Also do you really mean a "usb cable" without any device connected to
it on the other end?

By the way the rule you set up is so broad that the script will
basically be run on every boot or udevadm trigger.

Unless you have a very specific to match with, I wonder if it's a good
idea to unload the module by a remove event, because, for example,
what if there are two "cables"/devices using the module?

On 26 August 2015 at 04:17,  <christophe.jalady at free.fr> wrote:
> Hi,
>
> I would like to receive an event (actually run a script) when I plug/unplugged an usb cable.
> I tried to use udev with this simple rule:
> SUBSYSTEM=="usb",RUN+="/var/local/usb-changed.sh"
>
> I do receive the "add" event when I plug the usb cable: just perfect !
>
> But I never receive the "remove" event.
> Any idea why ?
>
> More information:
> I use linux kernel v3.16.
> When the cable is plugged, I load the kernel module "g_mass_storage", this work great. My need is to unload the module when the usb cable is unplugged (note it would be even better if I receive an event when the mass-storage is unmounted by the other host, but I do not have any idea where to look for.)
>
> Thanks by advance for any hint.
>
> Christophe
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