[Qemu-devel] [PATCH 2/5] monitor: Handle new and old style handlers

[Luiz Capitulino <lcapitulino@redhat.com>]

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).

Ported 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 ported yet,
nothing changes for them.

Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
---
 monitor.c |   27 +++++++++++++++++++++------
 1 files changed, 21 insertions(+), 6 deletions(-)

diff --git a/monitor.c b/monitor.c
index b43a287..9886bb0 100644
--- a/monitor.c
+++ b/monitor.c
@@ -2827,17 +2827,32 @@ 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);
 
-        handler = cmd->handler;
-        handler(mon, qdict);
+    if (cmd->user_print) {
+        QObject *data = NULL;
+        int (*handler_new)(Monitor *mon, const QDict *params,
+                           QObject **ret_data);
 
-        qemu_errors_to_previous();
+        handler_new = cmd->handler;
+        handler_new(mon, qdict, &data);
+
+        cmd->user_print(mon, data);
+
+        if (data)
+            qobject_decref(data);
+    } else {
+        void (*handler_old)(Monitor *mon, const QDict *qdict);
+        handler_old = cmd->handler;
+        handler_old(mon, qdict);
     }
 
+   qemu_errors_to_previous();
+
+out:
     QDECREF(qdict);
 }
 
-- 
1.6.4.2.253.g0b1fac