positive or negative error values from vendor library for immediate errors?

positive or negative error values from vendor library for immediate errors?

[Devesh Sharma]

Hello list,

While reviewing some the vendor library source I found that Mellanox and Pathscale user-space provider library returns positive error number if any immediate error is encountered. 
However, other vendor user-space libraries return negative error numbers.

Is there any guideline on this topic. If not, what is the correct way to do this.
Taking reference of glibc implementation, I found that it expects negative integer as return value.

Any pointer/reference/guideline will be a great help.

-Regards
 Devesh
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Re: positive or negative error values from vendor library for immediate errors?

[Dotan Barak]

Hi Devesh.

I wish that there was a header that maps the return errors to errno,
to make things much more canonical. But currently we don't have it :(

AFAIK, the guidelines is that kernel code returns negative values
and userspace code should return positive values.

Thanks
Dotan

On 08/12/2014 12:47, Devesh Sharma wrote:
> Hello list,
>
> While reviewing some the vendor library source I found that Mellanox and Pathscale user-space provider library returns positive error number if any immediate error is encountered.
> However, other vendor user-space libraries return negative error numbers.
>
> Is there any guideline on this topic. If not, what is the correct way to do this.
> Taking reference of glibc implementation, I found that it expects negative integer as return value.
>
> Any pointer/reference/guideline will be a great help.
>
> -Regards
>   Devesh
> --
> To unsubscribe from this list: send the line "unsubscribe linux-rdma" in
> the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

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