[Qemu-devel] [PATCH 02/25] qom: add object_child_foreach

[Paolo Bonzini <pbonzini@redhat.com>]

A utility function that will be used to implement hierarchical realization.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 include/qemu/object.h |   14 +++++++++++++-
 qom/object.c          |   17 +++++++++++++++++
 2 files changed, 30 insertions(+), 1 deletion(-)

diff --git a/include/qemu/object.h b/include/qemu/object.h
index f814521..470efe3 100644
--- a/include/qemu/object.h
+++ b/include/qemu/object.h
@@ -918,6 +918,19 @@ void object_property_add_str(Object *obj, const char *name,
                              struct Error **errp);
 
 /**
+ * object_child_foreach:
+ * @obj: the object whose children will be navigated
+ * @fn: the iterator function to be called
+ * @opaque: an opaque value that will be passed to the iterator
+ *
+ * Call @fn passing each child of @obj and @opaque to it, until @fn returns
+ * non-zero.  Return the last value returned by @fn, or 0 if there is no
+ * child.
+ */
+int object_child_foreach(Object *obj, int (*fn)(Object *child, void *opaque),
+                         void *opaque);
+
+/**
  * container_get:
  * @path: path to the container
  *
@@ -928,5 +941,4 @@ void object_property_add_str(Object *obj, const char *name,
  */
 Object *container_get(const char *path);
 
-
 #endif
diff --git a/qom/object.c b/qom/object.c
index 3e9fed7..4975d93 100644
--- a/qom/object.c
+++ b/qom/object.c
@@ -597,6 +597,23 @@ void object_class_foreach(void (*fn)(ObjectClass *klass, void *opaque),
     g_hash_table_foreach(type_table_get(), object_class_foreach_tramp, &data);
 }
 
+int object_child_foreach(Object *obj, int (*fn)(Object *child, void *opaque),
+                         void *opaque)
+{
+    ObjectProperty *prop;
+    int ret = 0;
+
+    QTAILQ_FOREACH(prop, &obj->properties, node) {
+        if (strstart(prop->type, "child<", NULL)) {
+            ret = fn(prop->opaque, opaque);
+            if (ret != 0) {
+                break;
+            }
+        }
+    }
+    return ret;
+}
+
 static void object_class_get_list_tramp(ObjectClass *klass, void *opaque)
 {
     GSList **list = opaque;
-- 
1.7.9.3