Re: Interface for communicating from kernel to user mode

Thanks for detailed answer.

With help of your description I reached valid file_t* file_fd in kernel 
module.
In kernel module I used file_fd = fd_getfile2(lwp_ptr->l_proc, user_fd); 
which encapsulates your older code.
Also test for descriptor type:
if(file_fd->f_type != DTYPE_SOCKET) {...} is ok, so I have both:
valid file_fd
and
struct socket* so = file_fd->f_undata.fd_so; in kernel module.

What I cannot resolve is which function to use for receiving data sent 
from user mode on retrieved file_fd in kernel module.
When I tried soo_read(file_fd,...) then OS freezes and need to reboot.
I call soo_read() in kernel thread.

Should it be functional or am I doing something wrong ?
Is needed different function for receiving data ? Or needed some 
preparing of file_fd before calling soo_read(file_fd, ...) ?

Peter