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My question is pretty much the same as - How to create a virtual file? except I want to do it in Linux instead. I imagine what I need to do is create a virtual device and point the application logging to that device. I'd like to write the device in python or ruby or something else interpreted, if possible.
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Use
mknod. You can create a socket file which your apps can write too. And your logging app would connect to the socket to read from it.check out named pipes http://en.wikipedia.org/wiki/Named_pipe
Mocking usb devices using umockdev
Umockdev is a linux based application which record the behaviour as well as properties of hardware and run the software independent of actual hardware it is running on. Hardware devices can be simulated in virtual environments without disturbing the whole system.It currently supports sysfs, uevents, basic support for /dev devices, and recording/mocking usbdevfs ioctls (for PtP/MTP devices).
umockdev home page
source code and examples