linux-kernel - Re: [PATCH 04/11] ptrace: implement PTRACE

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Message-ID: <20110509100931.GH1661@htj.dyndns.org>
Date:	Mon, 9 May 2011 12:09:31 +0200
From:	Tejun Heo <tj@...nel.org>
To:	Denys Vlasenko <vda.linux@...glemail.com>
Cc:	oleg@...hat.com, jan.kratochvil@...hat.com,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, indan@....nu
Subject: Re: [PATCH 04/11] ptrace: implement PTRACE_INTERRUPT

Hello,

On Sun, May 08, 2011 at 11:58:20PM +0200, Denys Vlasenko wrote:
> Are rules for PTRACE_INTERRUPT the same? That is, what happens
> if a different trap is taken?

Oh, PTRACE_INTERRUPT is different.  If it's scheduled, it will
eventually happen.  Other traps may happen before but INTERRUPT trap
will take place before control is returned to userland.

> Can you add API notes in the header, above corresponding defines? -
> 
> --- a/include/linux/ptrace.h
> +++ b/include/linux/ptrace.h
> @@ -48,6 +48,7 @@
>  #define PTRACE_SETREGSET       0x4205
>  
> <============================================ ADD COMMENT HERE
>  #define PTRACE_SEIZE           0x4206
> <============================================ ADD COMMENT HERE
> +#define PTRACE_INTERRUPT       0x4207
> 
> 
> They will be much more visible and up-to-date there than in Documentation,
> git logs etc...

Hmmm... I was thinking about writing a proper ptrace API doc with
example programs under Documentation/.  It's userland visible API so
it shouldn't change all that much and the amount of necessary
documentation would be too much for comments.

Thank you.

-- 
tejun
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