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

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Date:	Wed, 17 Feb 2010 21:23:12 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	"Dr. David Alan Gilbert" <linux@...blig.org>
Cc:	Andi Kleen <andi@...stfloor.org>,
	"Nikita V. Youshchenko" <yoush@...msu.su>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Extended error reporting to user space?

> 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?

> 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.

-Andi
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