GPIO wrapper for FreeBSD

This is a simple collection of GPIO wrappers for various languages for the FreeBSD gpio device. Currently it contains:

• An native ANSI C wrapper in native
• A Python wrapper based on the ioctl interface of the fcntl module. This is an implementation of the GPIO class of the labdevices GPIO base class

Those wrappers have been used to access the GPIO pins on platforms like the RaspberryPi.