On Wed, 16 Oct 2019 13:54:08 +0900, Irfan Ullah said:

> developed kernel space, and user space programs.  Kernel and user space
> programs working perfectly when I load and run these modules from the
> terminal using “sudo insmod kernelmodule.ko”, and “./userspaceApp”
> respectively.  But, when I try to use kernel program  (directly as a header
> file #include "kernelmodule.h") with the kernel original file that is
> “vmx.c” then it returns “NULL” while creating socket (nl_sk = NULL in nl_sk

You're going to have to explain in more detail what you're doing, and possibly
share your code.  "when I try to use kernel program directly" doesn't make sense....