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Re: [PATCH] posix: Add p{read,write}v2 RWF_NOWAIT flag (BZ#21738)
On 2017.07.10 at 16:47 -0300, Adhemerval Zanella wrote:
>
>
> On 10/07/2017 16:36, Zack Weinberg wrote:
> > Argh, one more thing:
> >
> > On Mon, Jul 10, 2017 at 3:34 PM, Zack Weinberg <zackw@panix.com> wrote:
> >>
> >> Suggest instead "Use nonblocking mode for this operation; that is,
> >> this call to @code{preadv2} will fail and set @code{errno} to
> >> @code{EAGAIN} if the operation would block."
> >
> > "... this call to @code{preadv2} or @code{pwritev2} ..." It does work
> > in both, right?
> >
> > zw
> >
>
> That's the new version:
>
> * sysdeps/unix/sysv/linux/bits/uio-ext.h (RWF_NOWAIT): New flag.
> diff --git a/sysdeps/unix/sysv/linux/bits/uio-ext.h b/sysdeps/unix/sysv/linux/bits/uio-ext.h
> index 4ddb644..12cd78e 100644
> --- a/sysdeps/unix/sysv/linux/bits/uio-ext.h
> +++ b/sysdeps/unix/sysv/linux/bits/uio-ext.h
> @@ -46,6 +46,10 @@ extern ssize_t process_vm_writev (pid_t __pid, const struct iovec *__lvec,
> #define RWF_HIPRI 0x00000001 /* High priority request. */
> #define RWF_DSYNC 0x00000002 /* per-IO O_DSYNC. */
> #define RWF_SYNC 0x00000004 /* per-IO O_SYNC. */
> +#define RWF_NOWAIT 0x00000008 /* per-IO, return -EAGAIN if operation
> + would block */
> +#define RWF_SUPPORTED (RWF_HIPRI | RWF_DSYNC | RWF_SYNC | RWF_NOWAIT)
In case you haven't noticed already, this still defines RWF_SUPPORTED in
uio-ext.h.
--
Markus