am fbec57d4: Merge changes Ib496e818,I074204e9

* commit 'fbec57d46c42460b2381484d1610ff21922d162e':
  bionic: add compatibility mode for properties
  bionic: use the size of the file to determine property area size

libc/include/sys/_system_properties.h

@@ -38,6 +38,7 @@ typedef struct prop_msg prop_msg;
 
 #define PROP_AREA_MAGIC   0x504f5250
 #define PROP_AREA_VERSION 0xfc6ed0ab
+#define PROP_AREA_VERSION_COMPAT 0x45434f76
 
 #define PROP_SERVICE_NAME "property_service"
 #define PROP_FILENAME "/dev/__properties__"
@@ -129,6 +130,15 @@ unsigned int __system_property_serial(const prop_info *pi);
 ** successive call. */
 unsigned int __system_property_wait_any(unsigned int serial);
 
+/*  Compatibility functions to support using an old init with a new libc,
+ ** mostly for the OTA updater binary.  These can be deleted once OTAs from
+ ** a pre-K release no longer needed to be supported. */
+const prop_info *__system_property_find_compat(const char *name);
+int __system_property_read_compat(const prop_info *pi, char *name, char *value);
+int __system_property_foreach_compat(
+        void (*propfn)(const prop_info *pi, void *cookie),
+        void *cookie);
+
 __END_DECLS
 
 #endif