SHM and Touchpad

Philip Semanchuk philip at
Wed Jun 17 16:09:18 EDT 2009

On Jun 17, 2009, at 3:56 PM, Sparky wrote:

> Hello! I am writing an application that requires access to the state
> of a synaptics touch pad on a laptop running Ubuntu Linux (for the
> number of fingers, pressure, x location, y location, etc). A different
> program using C++ accesses the information through SHM and I was
> hoping to do the same with Python. I looked in PyPi and I noticed that
> there was a module for SHM but I can not figure out where to download
> it from ( Does anyone have any
> suggestions?

Hi Sam,
I'm not familiar with that shm, however there was (and still is) a old  
Python IPC module called shm. It uses Sys V semaphores, not POSIX  
semaphores like the shm in pypi.

The old shm module has been replaced by two newer ones. For Sys V IPC:


The old shm module is still around on but I'm not  
updating it anymore (the author is AWOL and I'm just the maintainer)  
and I don't recommend using it.


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