Re: [PATCH net] sock: return uapi errno in sock_setsockopt() for SO_ZEROCOPY

[Willem de Bruijn]

On Fri, Feb 15, 2019 at 11:51 AM Alexey Kodanev
<alexey.koda...@oracle.com> wrote:
>
> For unsupported protocols, setsockopt() with SO_ZEROCOPY
> option sets errno to ENOTSUPP(524). But this number is
> not defined anywhere in the include/uapi/ headers.
>
> To make sure userspace sees the known number, replace
> ENOTSUPP(524) with EOPNOTSUPP(95).
>
> Fixes: 76851d1212c1 ("sock: add SOCK_ZEROCOPY sockopt")
> Signed-off-by: Alexey Kodanev <alexey.koda...@oracle.com>
> Reported-by: Petr Vorel <pvo...@suse.cz>

This code has been there since 4.14. I think it's too late to change
system call behavior.