omestre wrote:
> Hello,
> I need read some data in kernel mode... Somebody can help me?
> I have tried with read function, but i got segmentation fault...
> And i can't use the stdio.h :) then, how can i do this job???
The problem you are having is because you do not have a process
address space context for the copyout() to user space that's built
into the read(2) routine: you can not use the read(2) routine
directly from a kernel context, and you can only use it from an
adopted process context if you expend a great deal of effort.
You probably need to ask yourself three things:
1) What problem are you really trying to solve here, that
makes you think you need to do file I/O in the kernel?
2) Have you considered other solutions to the problem, ones
which do not require file I/O in the kernel?
3) Have you looked at the mailing list archives, to see the
three documented methods of doing this evil thing, which
people have already hashed out?
-- Terry
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