linux-arch-owner@xxxxxxxxxxxxxxx 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@xxxxxxxxxxxxx>
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
> ---
> include/asm-generic/errno.h | 4 ++++
> 1 files changed, 4 insertions(+), 0 deletions(-)
>
> On Monday 15 June 2009, liqin.chen@xxxxxxxxxxxxx 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.
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