Hi!
I wrote a C-server which communicates with a USB/HID device. now i want that this C-program starts every time I plug on the right device. I tried it out using udev but this was not very useful because if I start a process it has to be killed first for going on to create a device knode.
If I unplug it would be great if the c-prozess is killed.



But how could i realise that???

My rule in 10-local.rules located in /etc/udev/rules.d/ looks like this:

BUS="usb", SYSFS{serial}="1.0.0", NAME="usb/%k", SYMLINK="usb/Moeller_HID_GW", PROGRAM="/usr/bin/hello.sh"

(it is just a call of a helloworld.c with a sleep(20) for debugging...)

The funny thing is, if I try it to debug with "udevtest" the programm might be started/because the node-creating process stopps for 20 seconds but it doesn't print out "Hello World"...

I am working on a stable Debian and i have no idea why it doesn't work.

Is that also possible to realise that somewhere in /etc/hotplug????


Greetings!!!!!

where do you expect "hello" to be printed? certainly it's not going to be in your current terminal window or anything, udev has no bearing on your own login and no right to print messages to terminals all owver the place. instead i'd assume that it'd go off to syslog, so may well popup in /var/log/messages.

Yes, I knew that "hello" is not posted, but my main question is another...and in var/log/messages is it also not printed, if you mean that?

How can I realise that the process is started when I plug the device and it is killed if I unplug it????

What do you mean with using syslog and syslog.conf? How does that work???

greetings

well you'd use a mechanism that IS visible. you can use zenity from gnome to pop up a message on a predefined X server etc...