Little introduction to debugfs

[flavv]

I write a little introduction to debugfs

quote from Kernel documentation :

"Debugfs exists as a simple way for kernel developers to make information available to user space. Unlike /proc, which is only meant for information about a process, or sysfs, which has strict one-value-per-file rules, debugfs has no rules at all. Developers can put any information they want there. The debugfs filesystem is also intended to not serve as a stable ABI to user space; in theory, there are no stability constraints placed on files exported there. The real world is not always so simple, though [1]; even debugfs interfaces are best designed with the idea that they will need to be maintained forever."

in attachment 3 files :

• debugfs_par.txt : the text of the introduction
• kparm_debugfs.txt : a very simple example
• kparm_debugfs_file.txt : Another example, more complex shows you how to create a file in the most general way (with debugfs_create_file) and a blob.

debugfs_par.txt kparm_debugfs.txt kparm_debugfs_file.txt