What is the best way to process the content of sysfs using C/C++?

Question

The Linux kernel exposes information about the current environment using the sysfs filesystem in /sys. I'm interested in getting information about online CPUs and their memory hierarchy (Level 1 to Level 3 caches).

Since all this information is basically text files I could write a parser on my own, but I'm curious what the best way of processing the information in sysfs is. Currently I found two alternatives:

libsysfs

and

libudev

The downside of libsysfs seems to be that the code is now almost 5 years old and almost no documentation is available, libudev seems more active but documentation is quite rare. There was only one useful tutorial I found on libudev -- http://www.signal11.us/oss/udev/

What is the state of the art way to process content from sysfs in C/C++?

[Update]

Currently it is not possible to access data stored in /sys/devices/system due to the fact that the exposed information are not real devices. The only way to access this data is to do it manually.

Answer 1

The kernel authors have published sysfs-rules.txt, which explains how sysfs must be used. They point out in particular

Do not use libsysfs