monitor: New monitor_cur_is_qmp()

monitor.c

@@ -194,6 +194,12 @@ static inline int monitor_ctrl_mode(const Monitor *mon)
     return (mon->flags & MONITOR_USE_CONTROL);
 }
 
+/* Return non-zero iff we have a current monitor, and it is in QMP mode.  */
+int monitor_cur_is_qmp(void)
+{
+    return cur_mon && monitor_ctrl_mode(cur_mon);
+}
+
 static void monitor_read_command(Monitor *mon, int show_prompt)
 {
     if (!mon->rs)

monitor.h

@@ -31,6 +31,8 @@ typedef enum MonitorEvent {
     QEVENT_MAX,
 } MonitorEvent;
 
+int monitor_cur_is_qmp(void);
+
 void monitor_protocol_event(MonitorEvent event, QObject *data);
 void monitor_init(CharDriverState *chr, int flags);