Adding a dummy system call

[Augusto Mecking Caringi]

On Fri, Apr 4, 2014 at 9:20 PM, Adam Fowler <ajf2177 at columbia.edu> wrote:

> Hi Everyone,
>  I am trying to learn the linux kernel via the book Linux Kernel
> Development 3rd edition by Robert Love, and in it he advises to use the
> macro _syscallX to allow access to user added syscalls not wrapped by glibc
> functions. In my attempt to add a system call this macro failed me and
> after a little man page perusal I noticed _syscallX is obselete. Is it
> considered a better practice to declare the asmlinkage int sys_X(..)
> declaration myself instead of using this obsolete macro? Or did syscall(2)
> replace it? And if it was replaced does anyone have a reference they could
> point me for adding system calls in kernel 3.10 or similar? thank you in
> advance!
>
Hi,

    To call a new/generic syscall in userspace, take a look here:

    http://www.gnu.org/software/libc/manual/html_node/System-Calls.html

    To add a new syscall to a recent kernel, take a look here:

    http://blog.techveda.org/adding-system-calls-linux-kernel-3-5-x/

-- 
Augusto Mecking Caringi
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