On May 5, 2007, at 9:34 PM, Sonja Milicic wrote:
I'm working on an IO logging utility for FreeBSD as my GSoC
project, and
I have some questions about writing a kernel functions that would open
an existing or create a new file (with the file name as a parameter,
returns a vnode * for the file) and write data to that file (with
pointer to data as parameter). I've found some functions in existing
code that do similar things and might help me understand how to
solve my
problem, but as there isn't much documentation out there I still don't
understand a lot of things. So, could anyone please give me a detailed
explanation of how to open a file in kernel and write to it - best
data
types to use, functions, what to look out for, maybe a link to
tutorial
or manual that deals with this (if such a thing exists), etc.?
A good strategy for dealing with such questions is to look for code
that does a task similar to the one you want to implement. Two
kernel subsystems that come to my mind is the kernel logging
facility, which writes data to a user space process via a socket, and
the process accounting facility, which writes data to an already
opened file. There are reasons (performance, flexibility) why these
two facilities have been designed in this way, and it would be a good
idea to see whether some of their design decisions are also
applicable to your problem.
Diomidis Spinellis - http://www.spinellis.gr
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