Hi,
Ping. :-)
Best Regards,
Xiao Yang
On 2018/10/05 10:50, Xiao Yang wrote:
> According to the following kernel code, preadv2(2)/pwritev2(2) with
> an unknown flag actually returned EOPNOTSUPP instead of EINVAL:
> ----------------------------------------------------------------
> static inline int kiocb_set_rw_flags(struct kiocb *ki, rwf_t flags)
> {
> if (unlikely(flags & ~RWF_SUPPORTED)) {
> return -EOPNOTSUPP;
> }
> ...
> }
>
> static ssize_t do_loop_readv_writev(struct file *filp, struct iov_iter *iter,
> loff_t *ppos, int type, rwf_t flags)
> {
> ...
> if (flags & ~RWF_HIPRI)
> return -EOPNOTSUPP;
> ...
> }
>
> Signed-off-by: Xiao Yang <yangx.jy@xxxxxxxxxxxxxx>
> ---
> man2/readv.2 | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/man2/readv.2 b/man2/readv.2
> index 4441e92..2d73007 100644
> --- a/man2/readv.2
> +++ b/man2/readv.2
> @@ -312,7 +312,7 @@ The vector count,
> .IR iovcnt ,
> is less than zero or greater than the permitted maximum.
> .TP
> -.B EINVAL
> +.B EOPNOTSUPP
> An unknown flag is specified in \fIflags\fP.
> .SH VERSIONS
> .BR preadv ()
