Missing functions core.sys.linux.sched

[Begah]

Hey everyone!

I started working with network namespaces in linux and there's a 
function is sched.h in C that allows a threat to switch namespace 
: setns (https://man7.org/linux/man-pages/man2/setns.2.html)
I have checked both sched.d files from dmd and ldc and both are 
missing this function, although dmd's sched.d seems to be more 
complete than ldc's.

Is there a reason for the missing function aside from not being 
up to date? What are the options for adding it? A C library for 
just this function?