Monitor: Convert simple handlers to cmd_new_ret()

The following handlers always succeed and hence can be converted
to cmd_new_ret() in the same commit.

- do_stop()
- do_quit()
- do_system_reset()
- do_system_powerdown()
- do_migrate_cancel()
- do_qmp_capabilities()
- do_migrate_set_speed()
- do_migrate_set_downtime()

Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

4 files changed, 36 insertions, 24 deletions

diff --git a/migration.c b/migration.c
index 2320c5f..557bec4 100644
--- a/migration.c
+++ b/migration.c
@@ -98,15 +98,17 @@ void do_migrate(Monitor *mon, const QDict *qdict, QObject **ret_data)
     }
 }
 
-void do_migrate_cancel(Monitor *mon, const QDict *qdict, QObject **ret_data)
+int do_migrate_cancel(Monitor *mon, const QDict *qdict, QObject **ret_data)
 {
     MigrationState *s = current_migration;
 
     if (s)
         s->cancel(s);
+
+    return 0;
 }
 
-void do_migrate_set_speed(Monitor *mon, const QDict *qdict, QObject **ret_data)
+int do_migrate_set_speed(Monitor *mon, const QDict *qdict, QObject **ret_data)
 {
     double d;
     FdMigrationState *s;
@@ -119,6 +121,8 @@ void do_migrate_set_speed(Monitor *mon, const QDict *qdict, QObject **ret_data)
     if (s && s->file) {
         qemu_file_set_rate_limit(s->file, max_throttle);
     }
+
+    return 0;
 }
 
 /* amount of nanoseconds we are willing to wait for migration to be down.
@@ -132,14 +136,16 @@ uint64_t migrate_max_downtime(void)
     return max_downtime;
 }
 
-void do_migrate_set_downtime(Monitor *mon, const QDict *qdict,
-                             QObject **ret_data)
+int do_migrate_set_downtime(Monitor *mon, const QDict *qdict,
+                            QObject **ret_data)
 {
     double d;
 
     d = qdict_get_double(qdict, "value") * 1e9;
     d = MAX(0, MIN(UINT64_MAX, d));
     max_downtime = (uint64_t)d;
+
+    return 0;
 }
 
 static void migrate_print_status(Monitor *mon, const char *name,
diff --git a/migration.h b/migration.h
index 65572c1..9345d97 100644
--- a/migration.h
+++ b/migration.h
@@ -54,14 +54,14 @@ void qemu_start_incoming_migration(const char *uri);
 
 void do_migrate(Monitor *mon, const QDict *qdict, QObject **ret_data);
 
-void do_migrate_cancel(Monitor *mon, const QDict *qdict, QObject **ret_data);
+int do_migrate_cancel(Monitor *mon, const QDict *qdict, QObject **ret_data);
 
-void do_migrate_set_speed(Monitor *mon, const QDict *qdict, QObject **ret_data);
+int do_migrate_set_speed(Monitor *mon, const QDict *qdict, QObject **ret_data);
 
 uint64_t migrate_max_downtime(void);
 
-void do_migrate_set_downtime(Monitor *mon, const QDict *qdict,
-                             QObject **ret_data);
+int do_migrate_set_downtime(Monitor *mon, const QDict *qdict,
+                            QObject **ret_data);
 
 void do_info_migrate_print(Monitor *mon, const QObject *data);
 
diff --git a/monitor.c b/monitor.c
index 63c62fb..c1e0af8 100644
--- a/monitor.c
+++ b/monitor.c
@@ -417,13 +417,15 @@ void monitor_protocol_event(MonitorEvent event, QObject *data)
     QDECREF(qmp);
 }
 
-static void do_qmp_capabilities(Monitor *mon, const QDict *params,
-                                QObject **ret_data)
+static int do_qmp_capabilities(Monitor *mon, const QDict *params,
+                               QObject **ret_data)
 {
     /* Will setup QMP capabilities in the future */
     if (monitor_ctrl_mode(mon)) {
         mon->mc->command_mode = 1;
     }
+
+    return 0;
 }
 
 static int compare_cmd(const char *name, const char *list)
@@ -962,9 +964,10 @@ static void do_info_cpu_stats(Monitor *mon)
 /**
  * do_quit(): Quit QEMU execution
  */
-static void do_quit(Monitor *mon, const QDict *qdict, QObject **ret_data)
+static int do_quit(Monitor *mon, const QDict *qdict, QObject **ret_data)
 {
     exit(0);
+    return 0;
 }
 
 static int eject_device(Monitor *mon, BlockDriverState *bs, int force)
@@ -1129,9 +1132,10 @@ static void do_singlestep(Monitor *mon, const QDict *qdict)
 /**
  * do_stop(): Stop VM execution
  */
-static void do_stop(Monitor *mon, const QDict *qdict, QObject **ret_data)
+static int do_stop(Monitor *mon, const QDict *qdict, QObject **ret_data)
 {
     vm_stop(EXCP_INTERRUPT);
+    return 0;
 }
 
 static void encrypted_bdrv_it(void *opaque, BlockDriverState *bs);
@@ -1829,19 +1833,21 @@ static void do_boot_set(Monitor *mon, const QDict *qdict)
 /**
  * do_system_reset(): Issue a machine reset
  */
-static void do_system_reset(Monitor *mon, const QDict *qdict,
-                            QObject **ret_data)
+static int do_system_reset(Monitor *mon, const QDict *qdict,
+                           QObject **ret_data)
 {
     qemu_system_reset_request();
+    return 0;
 }
 
 /**
  * do_system_powerdown(): Issue a machine powerdown
  */
-static void do_system_powerdown(Monitor *mon, const QDict *qdict,
-                                QObject **ret_data)
+static int do_system_powerdown(Monitor *mon, const QDict *qdict,
+                               QObject **ret_data)
 {
     qemu_system_powerdown_request();
+    return 0;
 }
 
 #if defined(TARGET_I386)
diff --git a/qemu-monitor.hx b/qemu-monitor.hx
index 7f9d261..8e51df0 100644
--- a/qemu-monitor.hx
+++ b/qemu-monitor.hx
@@ -123,7 +123,7 @@ ETEXI
         .params     = "",
         .help       = "quit the emulator",
         .user_print = monitor_user_noop,
-        .mhandler.cmd_new = do_quit,
+        .cmd_new_ret = do_quit,
     },
 
 STEXI
@@ -303,7 +303,7 @@ ETEXI
         .params     = "",
         .help       = "stop emulation",
         .user_print = monitor_user_noop,
-        .mhandler.cmd_new = do_stop,
+        .cmd_new_ret = do_stop,
     },
 
 STEXI
@@ -494,7 +494,7 @@ ETEXI
         .params     = "",
         .help       = "reset the system",
         .user_print = monitor_user_noop,
-        .mhandler.cmd_new = do_system_reset,
+        .cmd_new_ret = do_system_reset,
     },
 
 STEXI
@@ -510,7 +510,7 @@ ETEXI
         .params     = "",
         .help       = "send system power down event",
         .user_print = monitor_user_noop,
-        .mhandler.cmd_new = do_system_powerdown,
+        .cmd_new_ret = do_system_powerdown,
     },
 
 STEXI
@@ -791,7 +791,7 @@ ETEXI
         .params     = "",
         .help       = "cancel the current VM migration",
         .user_print = monitor_user_noop,
-        .mhandler.cmd_new = do_migrate_cancel,
+        .cmd_new_ret = do_migrate_cancel,
     },
 
 STEXI
@@ -806,7 +806,7 @@ ETEXI
         .params     = "value",
         .help       = "set maximum speed (in bytes) for migrations",
         .user_print = monitor_user_noop,
-        .mhandler.cmd_new = do_migrate_set_speed,
+        .cmd_new_ret = do_migrate_set_speed,
     },
 
 STEXI
@@ -821,7 +821,7 @@ ETEXI
         .params     = "value",
         .help       = "set maximum tolerated downtime (in seconds) for migrations",
         .user_print = monitor_user_noop,
-        .mhandler.cmd_new = do_migrate_set_downtime,
+        .cmd_new_ret = do_migrate_set_downtime,
     },
 
 STEXI
@@ -1132,7 +1132,7 @@ ETEXI
         .params     = "",
         .help       = "enable QMP capabilities",
         .user_print = monitor_user_noop,
-        .mhandler.cmd_new = do_qmp_capabilities,
+        .cmd_new_ret = do_qmp_capabilities,
     },
 
 STEXI