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SubjectRe: How to write System calls?
Yes -- system calls can be implemented
as modules.
prog8.c is a module.
prog9.c is a user-space program.

In <asm/unistd.h> -- add
#define __NR_my_func 250

----- Original Message -----
From: Matthieu Delahaye <>
Date: Tuesday, October 30, 2001 2:41 pm
Subject: Re: How to write System calls?

> Hi,
> First, I propose you to have a look on "Linux Kernel 2.4 Internals"
> from
> Tigran Aivazian. You can read it from the LDP at exact URL:
> In this, you'll probably see that syscalls are hardcoded (file
> arch/xxx/kernel/entry.S on your kernel tree).
> This means, AFAIK, you cannot implements a syscall function in a
> module ;-)
> One other way is using your modules to implements char drivers and
> use
> ioctl() as if it was yours syscalls. This method is generally
> recommended to users who wants to implement new sayscalls.
> Am I wrong?
> Regards,
> Matthieu
> Sureshkumar Kamalanathan wrote:
> >Hi All,
> > Good day!
> > I have 2.4.4 kernel. I have to write some system calls for
> >interaction with the kernel from the userland. Can any of you
> tell me
> >where I can get the information regarding this?
> > I have the Linux Kernel Internals by Beck and others. But it gives
> >the procedure only for 2.2.x.
> > Moreover I need to implement these system calls as Loadable
> modules.> Any pointers in this regard will be highly appreciated
> and I'll very
> >grateful!!
> >
> > Thanks in advance,
> >
> >Regards,
> >Suresh.
> >-
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