Re: Accessing data structure from kernel space

[linux-os]

On Wed, 23 Mar 2005, linux lover wrote:

> Hello linux-os,
> --- linux-os <linux-os@xxxxxxxxxxxx> wrote:
> > On Wed, 23 Mar 2005, linux lover wrote:
> >
> > > Hello all,
> > >        I have one linked list data structure added
> > to
> > > a file in kernel source code which has some kernel
> > > info. I want to acess that linked list structure
> > from
> > > user space. Is that possible??
> > >        Also how to add own system call usable at
> > user
> > > level from kernel module??
> > > regards,
> > > linux_lover.
> >
> > Many people will tell you to use the /proc
> > file-system.
> > I suggest you make a simple "character" driver and
> > access
> > your kernel structure using ioctl() or mmap().
>      How can i access that linked list structure in
> kernel at user space say if i write character driver
> as /dev/readll then how to link that structure to
> device driver
> ?

Gawd.... `man ioctl`. Execute that. Learn. Write code
that handles such a call in your module.
`man mmap`. execute that. Learn. Write code that
handles memory-mapping in your module.

> > You don't add your own system call __ever__, even if
> > you
> > are a long-time kernel developer. The current API
> > already
> > has lots of standard interface capabilities.
> > Thinking, even
> > for an instant, that you need more means that you
> > don't
> > understand Unix/Linux.
> >
> > Cheers,
> > Dick Johnson
> > Penguin : Linux version 2.6.11 on an i686 machine
> > (5537.79 BogoMips).
> >   Notice : All mail here is now cached for review by
> > Dictator Bush.
> >                   98.36% of all statistics are
> > fiction.
>
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Cheers,
Dick Johnson
Penguin : Linux version 2.6.11 on an i686 machine (5537.79 BogoMips).
 Notice : All mail here is now cached for review by Dictator Bush.
                 98.36% of all statistics are fiction.
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