qemu-devel
[Top][All Lists]
Advanced

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Qemu-devel] [PATCH] char: translate from QIOChannel error to errno


From: Daniel P. Berrange
Subject: Re: [Qemu-devel] [PATCH] char: translate from QIOChannel error to errno
Date: Fri, 11 Mar 2016 18:36:00 +0000
User-agent: Mutt/1.5.24 (2015-08-30)

On Fri, Mar 11, 2016 at 06:55:24PM +0100, address@hidden wrote:
> From: Marc-André Lureau <address@hidden>
> 
> Caller of CharDriverState.chr* callback assume errno error conventions.
> Translate QIOChannel error to errno (this fixes potential EAGAIN
> regression, for ex if a vhost-user backend block, qemu_chr_fe_read_all()
> could get error -2 and not wait)
> 
> Signed-off-by: Marc-André Lureau <address@hidden>

Reviewed-by: Daniel P. Berrange <address@hidden>

> ---
>  qemu-char.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/qemu-char.c b/qemu-char.c
> index ad11b75..4317388 100644
> --- a/qemu-char.c
> +++ b/qemu-char.c
> @@ -2727,6 +2727,13 @@ static ssize_t tcp_chr_recv(CharDriverState *chr, char 
> *buf, size_t len)
>                                       NULL);
>      }
>  
> +    if (ret == QIO_CHANNEL_ERR_BLOCK) {
> +        errno = EAGAIN;
> +        ret = -1;
> +    } else if (ret == -1) {
> +        errno = EIO;
> +    }
> +
>      if (msgfds_num) {
>          /* close and clean read_msgfds */
>          for (i = 0; i < s->read_msgfds_num; i++) {

Regards,
Daniel
-- 
|: http://berrange.com      -o-    http://www.flickr.com/photos/dberrange/ :|
|: http://libvirt.org              -o-             http://virt-manager.org :|
|: http://autobuild.org       -o-         http://search.cpan.org/~danberr/ :|
|: http://entangle-photo.org       -o-       http://live.gnome.org/gtk-vnc :|



reply via email to

[Prev in Thread] Current Thread [Next in Thread]