The software described in this documentation is either in Extended Support or Sustaining Support. See for more information.
Oracle recommends that you upgrade the software described by this documentation as soon as possible.

4.3 About the /sys Virtual File System

In addition to /proc, the kernel exports information to the /sys virtual file system (sysfs). Programs such as the dynamic device manager, udev, use /sys to access device and device driver information. The implementation of /sys has helped to tidy up the /proc file system as most hardware information has been moved to /sys.


/sys exposes kernel data structures and control points, which implies that it might contain circular references, where a directory links to an ancestor directory. As a result, a find command used on /sys might never terminate.