>> 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"?
yes, my script never receive the "remove" event (_but_ receive the "add" event). >> Also do you really mean a "usb cable" without any device connected to > it on the other end? No, the cable is connected to another device. So I want the "remove" event when the cable is unplugged from one of the device (my device or the other one). > 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, > ...what if there are two "cables"/devices using the module? Well, my setup is really specific (small robotic device), so it safe to consider only one cable connected. >Also it seems to be g_mass_storage is just the module for setting up >dummy or emulating an mass storage device. Why would you want it to >depend on a usb "cable"/device? This is the bigger picture: My device is a small robotic device. To send a file on it, I that users just copy files like they do with mass-storage usb-key. So: On usb-plugged: I load the module k_mass_storage: the other device see a new mass-storage device appearing, copy files and then umount/unplugged the cable. When the cable is unplugged, I want to trigger an action on my device (processing the files copied). Christophe ----- Mail original ----- De: "Tom Yan" <tom.t...@gmail.com> À: "christophe jalady" <christophe.jal...@free.fr> Cc: "systemd" <systemd-devel@lists.freedesktop.org> Envoyé: Mercredi 26 Août 2015 04:37:40 Objet: Re: [systemd-devel] udev event on usb unpluged Also it seems to be g_mass_storage is just the module for setting up dummy or emulating an mass storage device. Why would you want it to depend on a usb "cable"/device? On 26 August 2015 at 11:21, Tom Yan <tom.t...@gmail.com> wrote: > 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.jal...@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 >> _______________________________________________ >> systemd-devel mailing list >> systemd-devel@lists.freedesktop.org >> http://lists.freedesktop.org/mailman/listinfo/systemd-devel _______________________________________________ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel
