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

[Dotan Barak <dotanba-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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
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