Re: Adding a system call to kernel

[jensen galan <jrgalan@yahoo.com>]

Thanks Geert.

You know, I knew I had to do include this, and spent
all weekend trying to figure out where to include
<errno.h>.

But, for some reason, after reading your reply, the
simplicity dawned on me - include it in the user-space
program dummy.

That's what you should have written ;)

Thanks again - it worked!

Jensen

--- Geert Uytterhoeven <geert@linux-m68k.org> wrote:
> On Mon, 9 May 2005, jensen galan wrote:
> > I am trying to add a system call to a 2.4 kernel. 
> > It's a simple system call which merely prints the
> > value of xtime.  The kernel recompiles OK, and my
> > user-space program (p5_a.c) actually works using
> the
> > added system call when I use syscall() and do not
> > generate a stub. (The 2 versions of my user-space
> > programs are included below).  However, when I try
> to
> > generate a stub in my user-space program using
> > _syscall2(), I receive the following compilation
> > error:
> > 
> > # gcc -Wall -D__KERNEL__ -I
> > /lib/modules/2.4.28-gentoo-r5/build/include -o
> p5_b
> > p5_b.c
> > /tmp/cc5nBrjZ.o(.text+0x23): In function
> > 'pedagogictime':
> > : undefined reference to 'errno'
> > collect2: ld returned 1 exit status
> 
> Please include <errno.h>
> 
> Gr{oetje,eeting}s,
> 
> 						Geert
> 
> --
> Geert Uytterhoeven -- There's lots of Linux beyond
> ia32 -- geert@linux-m68k.org
> 
> In personal conversations with technical people, I
> call myself a hacker. But
> when I'm talking to journalists I just say
> "programmer" or something like that.
> 							    -- Linus Torvalds
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