[Qemu-devel] [PATCH 2/4] util: Add a notifier list for qemu_vfree()

[Fam Zheng]

To allow other code to intercept buffer freeing and do customized
unmapping operations.

Signed-off-by: Fam Zheng <f...@redhat.com>
---
 include/qemu/notify.h | 1 +
 util/oslib-posix.c    | 9 +++++++++
 2 files changed, 10 insertions(+)

diff --git a/include/qemu/notify.h b/include/qemu/notify.h
index a3d73e4..24c4f5f 100644
--- a/include/qemu/notify.h
+++ b/include/qemu/notify.h
@@ -69,4 +69,5 @@ void notifier_with_return_remove(NotifierWithReturn 
*notifier);
 int notifier_with_return_list_notify(NotifierWithReturnList *list,
                                      void *data);
 
+void qemu_vfree_add_notifier(Notifier *n);
 #endif
diff --git a/util/oslib-posix.c b/util/oslib-posix.c
index f631464..b0dd207 100644
--- a/util/oslib-posix.c
+++ b/util/oslib-posix.c
@@ -125,9 +125,18 @@ void *qemu_anon_ram_alloc(size_t size, uint64_t *alignment)
     return ptr;
 }
 
+static NotifierList qemu_vfree_notifiers =
+    NOTIFIER_LIST_INITIALIZER(qemu_vfree_notifiers);
+
+void qemu_vfree_add_notifier(Notifier *n)
+{
+    notifier_list_add(&qemu_vfree_notifiers, n);
+}
+
 void qemu_vfree(void *ptr)
 {
     trace_qemu_vfree(ptr);
+    notifier_list_notify(&qemu_vfree_notifiers, ptr);
     free(ptr);
 }
 
-- 
2.9.3