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Re: [PATCH v6 09/16] libs/ctrl: Allows writev_exact to change iov array
- To: Frediano Ziglio <freddy77@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Tue, 30 Jun 2026 18:08:59 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Frediano Ziglio <frediano.ziglio@xxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Teddy Astie <teddy.astie@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>
- Delivery-date: Tue, 30 Jun 2026 17:09:27 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 19/06/2026 2:04 pm, Frediano Ziglio wrote:
> diff --git a/tools/libs/ctrl/xc_private.h b/tools/libs/ctrl/xc_private.h
> index b5892ae8dc..3af996e900 100644
> --- a/tools/libs/ctrl/xc_private.h
> +++ b/tools/libs/ctrl/xc_private.h
> @@ -383,7 +383,7 @@ int xc_flush_mmu_updates(xc_interface *xch, struct xc_mmu
> *mmu);
> /* Return 0 on success; -1 on error setting errno. */
> int read_exact(int fd, void *data, size_t size); /* EOF => -1, errno=0 */
> int write_exact(int fd, const void *data, size_t size);
> -int writev_exact(int fd, const struct iovec *iov, int iovcnt);
> +int writev_exact(int fd, struct iovec *iov, int iovcnt);
No callers care, but this is written with a const pointer to match writev().
If we really do want to take this change, then it needs to come with a
comment saying /* May edit iov to cope with partial writes. */
~Andrew
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