viewing sysfs architecture from userpace

unifoxz · 01-18-2012, 03:40 AM

From userspace, we can see the sysfs tree structure in kernel.
Can anyone give me the idea how does this information show up in the userspace?

Thank you.

barunparichha · 01-20-2012, 02:32 AM

There must be sysfs driver support in kernel space.
Sysfs works in coordination with udev and hal, to export device information from kernel space to user space.

unifoxz · 01-20-2012, 07:33 AM

Thanks Barun.

How about the /sys contents displayed on the terminal?
How does it get printed on the terminal in userspace?

sundialsvcs · 01-20-2012, 09:33 AM

Each of these various "virtual" file systems presents a set of "files" and "directories" that do not actually exist. When you "read" them, a subroutine in the kernel is responsible for creating the output that you see.