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Date: Wed, 7 Oct 2009 09:54:05 -0300
From: Luiz Capitulino <lcapitulino@redhat.com>
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Subject: [Qemu-devel] Re: [PATCH 05/15] monitor: Handle new and old style
	handlers
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To: Anthony Liguori <aliguori@us.ibm.com>
Cc: qemu-devel@nongnu.org, avi@redhat.com

On Tue, 06 Oct 2009 20:42:47 -0500
Anthony Liguori <aliguori@us.ibm.com> wrote:

> Luiz Capitulino wrote:
> > This commit changes monitor_handle_command() to support old style
> > _and_ new style handlers.
> >
> > New style handlers are protocol independent, they return their
> > data to the Monitor, which in turn decides how to print them
> > (ie. user protocol vs. machine protocol).
> >
> > Converted handlers will use the 'user_print' member of 'mon_cmd_t'
> > to define its user protocol function, which will be called to print
> > data in the user protocol format.
> >
> > Handlers which don't have 'user_print' defined are not converted
> > and are handled as usual.
> >
> > Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
> > ---
> >  monitor.c |   32 ++++++++++++++++++++++++++------
> >  1 files changed, 26 insertions(+), 6 deletions(-)
> >
> > diff --git a/monitor.c b/monitor.c
> > index 9d4c168..c0ba5ee 100644
> > --- a/monitor.c
> > +++ b/monitor.c
> > @@ -211,6 +211,11 @@ static int monitor_fprintf(FILE *stream, const char *fmt, ...)
> >      return 0;
> >  }
> >
> > +static inline int monitor_handler_ported(const mon_cmd_t *cmd)
> > +{
> > +    return cmd->user_print != NULL;
> > +}
> > +
> >  static int compare_cmd(const char *name, const char *list)
> >  {
> >      const char *p, *pstart;
> > @@ -3053,17 +3058,32 @@ static void monitor_handle_command(Monitor *mon, const char *cmdline)
> >      qdict = qdict_new();
> >
> >      cmd = monitor_parse_command(mon, cmdline, qdict);
> > -    if (cmd) {
> > -        void (*handler)(Monitor *mon, const QDict *qdict);
> > +    if (!cmd)
> > +        goto out;
> > +
> > +    qemu_errors_to_mon(mon);
> >
> > -        qemu_errors_to_mon(mon);
> > +    if (monitor_handler_ported(cmd)) {
> > +        QObject *data = NULL;
> > +        void (*handler_new)(Monitor *mon, const QDict *params,
> > +                            QObject **ret_data);
> >   
> 
> Screams to be a typedef.
> 
> > -        handler = cmd->handler;
> > -        handler(mon, qdict);
> > +        handler_new = cmd->handler;
> > +        handler_new(mon, qdict, &data);
> >   
> 
> At this point, couldn't cmd->handler be a union so we had a bit more 
> type safety?

 Yes, will do.