Re: [Qemu-devel] [PATCH v2] Add chardev-send-break monitor command

[Eric Blake]

On 06/11/2017 02:48 AM, Stefan Fritsch wrote:
> Sending a break on a serial console can be useful for debugging the
> guest. But not all chardev backends support sending breaks (only telnet
> and mux do). The chardev-send-break command allows to send a break even
> if using other backends.
> 
> Signed-off-by: Stefan Fritsch <address@hidden>
> Acked-by: Dr. David Alan Gilbert <address@hidden>
> ---
> v2: added tests and Acked-by line
> 

> +++ b/hmp-commands.hx
> @@ -1745,6 +1745,22 @@ Removes the chardev @var{id}.
>  ETEXI
>  
>      {
> +        .name       = "chardev-send-break",
> +        .args_type  = "id:s",
> +        .params     = "id",
> +        .help       = "send break on chardev",

Compare this wording,...

> +STEXI
> address@hidden chardev-send-break id
> address@hidden chardev-send-break
> +Sends break on the chardev @var{id}.

repeated here,

> +++ b/qapi-schema.json
> @@ -5114,6 +5114,26 @@
>  { 'command': 'chardev-remove', 'data': {'id': 'str'} }
>  
>  ##
> +# @chardev-send-break:
> +#
> +# Send a break to a character device

...with this wording.  I like 'send a break' better than 'send break',
but even better might be 'send a break sequence' or even 'emulate a
break sequence' (by definition, a break is NOT a character, but on bare
metal character devices it IS a defined electrical sequence distinct
from characters to make the recipient aware that the sender is trying to
get attention).

Otherwise, the patch looks fine to me.  If all that changes is some
word-smithing (and the maintainer may be willing to do that), you can add:
Reviewed-by: Eric Blake <address@hidden>

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org

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