linux-kernel - Re: Extended error reporting to user space?

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Message-ID: <20100221000229.GA8092@gallifrey>
Date:	Sun, 21 Feb 2010 00:02:29 +0000
From:	"Dr. David Alan Gilbert" <linux@...blig.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	"Nikita V. Youshchenko" <yoush@...msu.su>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Extended error reporting to user space?

* Andi Kleen (andi@...stfloor.org) wrote:
> > I'd wondered about some form of halfway house where the error
> > value is expanded but could be truncated for compatibility - i.e.
> 
> Who would do the truncation?

I'd assumed something like the code in entry*.S or equivalent for
existing syscalls, but have another entry that would pass it through
to a newer libc that new how to handle it.

> > if at the moment we had:
> > 
> >     return -EINVAL;
> > 
> > it would become:
> > 
> >     return ERRORNUM(EINVAL, BADLENGTH);
> 
> x86 only has about 12 bits in the current ABI btw.

Ah yes I can see that now, hmm.

Dave
-- 
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/ Dr. David Alan Gilbert    | Running GNU/Linux on Alpha,68K| Happy  \ 
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