Dear list members, I am poking around trying to write my first non-trivial kernel module. It is a character driver (though there is no real device).
It gets a memory buffer via vmalloc() and then shares this buffer with user program (which has to issue mmap to start using the buffer) I have a question about handling page faults. I see that there is something called vm_operations_struct in linux/mm.h . 1) It has a function pointer and the comments seem to indicate that I need to provide a function which will be called when there is a page fault. Can someone please tell me if I have to worry about page faults. I do not have any real device , i am just using normal vmalloc'ed memory as my "mapped memory buffer" 2) What is the use of the open/close and other operations inside that struct? I mean - for char drivers, there are open/close entry points that correspond to the user space open/close calls. But the open/close operations inside the vm_area_struct - to what user space operation do they correspond? Many Thanks! -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to [email protected] Please read the FAQ at http://kernelnewbies.org/FAQ
