linux-kernel - Re: [PATCH] asm-generic: add EMAXERRNO

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Date:	Mon, 15 Jun 2009 21:33:21 +0800
From:	liqin.chen@...plusct.com
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-arch@...r.kernel.org, linux-arch-owner@...r.kernel.org,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org
Subject: Re: [PATCH] asm-generic: add EMAXERRNO

linux-arch-owner@...r.kernel.org 写于 2009-06-15 21:30:09:

> Some architectures want to flag error returns from a syscall based on
> the return value. The range from zero to -511 is for errors that
> we can return to user space, so add a #define for this to
> include/asm-generic/errno.h.
> 
> Reported-by: Chen Liquin <liqin.chen@...plusct.com>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  include/asm-generic/errno.h |    4 ++++
>  1 files changed, 4 insertions(+), 0 deletions(-)
> 
> On Monday 15 June 2009, liqin.chen@...plusct.com wrote:
> 
> > Maybe I can don't use EMAXERRNO in score code. But I think define a 
> > maximum error number in asm-generic/errno.h is better.
> > 
> 
> How about this one?
> 
> diff --git a/include/asm-generic/errno.h b/include/asm-generic/errno.h
> index e8852c0..16bb31d 100644
> --- a/include/asm-generic/errno.h
> +++ b/include/asm-generic/errno.h
> @@ -106,4 +106,8 @@
>  #define   EOWNERDEAD   130   /* Owner died */
>  #define   ENOTRECOVERABLE   131   /* State not recoverable */
> 
> +#ifdef __KERNEL__
> +#define   EMAXERRNO   511   /* maximum errno value we return to user */
> +#endif
> +
>  #endif
> -- 
OK, it is easy to use.