Hi all,
I have written a user space program which traps keyboard input from several input sources using select() function on the /dev/input/eventX files.
It works nicely, but how can i detect from that same program if user decides to pull-out a USB connected keyboard or insert another in the USB port of the embedded Linux system ?
B.Rgds. Peter Denmark
Take a look at libusb
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The kernel is running the /sbin/hotplug executable in such a case. Do whatever yo need to do in this executabole which could be any kind of executable (bash-script,ELF-binary, etc.). You could simply send a signal from /sbin/hotplug to your Process which causes it to reopen devices e.g.
Sven
Hi Sven,
Thank you for your input.
The /sbin/hotplug is not default installed on my ARM board running embedded Linux version 2.6.13.2. Is it a shell program or a binary executable ? Can it be cross compiled if binary ?
How can it "signal" my process ? Can it for example send a message or is it by calling another binary program ? Does hotplug tell mee which device i.e. keyboard, barcode scanner or other USB device has been changed ?
Peter
Ummm... Google for hotplug - 1st hit.
Whatever you wand it to be. The Standard Linux hotplug script is written in bash and is somewhat slow for this reason. Have a look at
I use a very small script in one of my applications for detecting USB events instead of the Standard script.
Using kill from whithin a shell-script or corresponding system-call from C.
Sven
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