Add exit notifiers

Like atexit() but with state
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

sysemu.h

@@ -8,6 +8,7 @@
 #include "qemu-timer.h"
 #include "qdict.h"
 #include "qerror.h"
+#include "notify.h"
 
 #ifdef _WIN32
 #include <windows.h>
@@ -73,6 +74,10 @@ int qemu_savevm_state_complete(Monitor *mon, QEMUFile *f);
 void qemu_savevm_state_cancel(Monitor *mon, QEMUFile *f);
 int qemu_loadvm_state(QEMUFile *f);
 
+void exit_notifier_add(Notifier *notifier);
+void exit_notifier_remove(Notifier *notifier);
+
+
 #ifdef _WIN32
 /* Polling handling */
 

vl.c

@@ -150,6 +150,7 @@ int main(int argc, char **argv)
 #include "qemu-option.h"
 #include "qemu-config.h"
 #include "qemu-objects.h"
+#include "notify.h"
 
 #include "disas.h"
 
@@ -553,6 +554,32 @@ static int socket_init(void)
 }
 #endif
 
+/*********************/
+/* Exit notifiers    */
+/*********************/
+
+static NotifierList exit_notifiers = NOTIFIER_LIST_INITIALIZER(exit_notifiers);
+
+void exit_notifier_add(Notifier *notifier)
+{
+    notifier_list_add(&exit_notifiers, notifier);
+}
+
+void exit_notifier_remove(Notifier *notifier)
+{
+    notifier_list_remove(&exit_notifiers, notifier);
+}
+
+static void exit_notifier_notify(void)
+{
+    notifier_list_notify(&exit_notifiers);
+}
+
+static void exit_notifier_init(void)
+{
+    atexit(exit_notifier_notify);
+}
+
 /***********************************************************/
 /* Bluetooth support */
 static int nb_hcis;