linux-kernel - Re: [patch 02/11] syslets: add syslet.h include file, user API/ABI definitions

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Date:	Tue, 13 Feb 2007 23:32:41 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Indan Zupancic <indan@....nu>
Cc:	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Christoph Hellwig <hch@...radead.org>,
	Andrew Morton <akpm@....com.au>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Ulrich Drepper <drepper@...hat.com>
Subject: Re: [patch 02/11] syslets: add syslet.h include file, user API/ABI definitions

* Indan Zupancic <indan@....nu> wrote:

> What I propose:
> 
> 	atom1 returns 0, has SYSLET_STOP_ON_ZERO|SYSLET_SKIP_NEXT_ON_STOP set
> 	atom2
> 	atom3
> 
> (You've already used my SYSLET_SKIP_NEXT_ON_STOP instead of 
> SYSLET_SKIP_TO_NEXT_ON_STOP. ;-)

doh. Yes. I noticed and implemented this yesterday and it's in the 
submitted syslet code - but i guess i was too tired to remember my own 
code - so i added the wrong comments :-/ If you look at the sample 
user-space code:

        init_atom(req, &req->open_file, __NR_sys_open,
                  &req->filename_p, &O_RDONLY_var, NULL, NULL, NULL, NULL,
                  &req->fd, SYSLET_STOP_ON_NEGATIVE, &req->read_file);

the 'STOP_ON_NEGATIVE' acts on that particular atom.

this indeed cleaned up things quite a bit and made the user-space syslet 
code alot more straightforward. A return value can still be recovered 
and examined (with a different condition and a different jump target) 
arbitrary number of times via ret_ptr and via sys_umem_add().

	Ingo
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