October 2017
Intermediate to advanced
586 pages
14h 8m
English
Content preview from Linux Device Drivers Development
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The device model and sysfs
Sysfs is a non-persistent virtual filesystem that provides a global view of the system and exposes the kernel object's hierarchy (topology) by means of their kobjects. Each kobject shows up as a directory, and files in a directory representing kernel variables, exported by the related kobject. These files are called attributes, and can be read or written.
Any registered kobject creates a directory in sysfs; where the directory is created depends on the kobject's parent (which is a kobject too). It is natural that directories are created as subdirectories of the kobject's parent. This highlights internal object hierarchies to the user space. Top-level directories in sysfs represent common ancestors of object hierarchies, ...
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