1 files changed, 36 insertions, 0 deletions
diff --git a/include/android/system/core/include/cutils/native_handle.h b/include/android/system/core/include/cutils/native_handle.h
index edd7888f..dbd37672 100644
--- a/include/android/system/core/include/cutils/native_handle.h
+++ b/include/android/system/core/include/cutils/native_handle.h
@@ -18,18 +18,37 @@
 #ifndef NATIVE_HANDLE_H_
 #define NATIVE_HANDLE_H_
 
+#include <stdalign.h>
+
 #ifdef __cplusplus
 extern "C" {
 #endif
 
+#define NATIVE_HANDLE_MAX_FDS 1024
+#define NATIVE_HANDLE_MAX_INTS 1024
+
+/* Declare a char array for use with native_handle_init */
+#define NATIVE_HANDLE_DECLARE_STORAGE(name, maxFds, maxInts) \
+    alignas(native_handle_t) char (name)[                            \
+      sizeof(native_handle_t) + sizeof(int) * ((maxFds) + (maxInts))]
+
 typedef struct native_handle
 {
     int version;        /* sizeof(native_handle_t) */
     int numFds;         /* number of file-descriptors at &data[0] */
     int numInts;        /* number of ints at &data[numFds] */
+#if defined(__clang__)
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wzero-length-array"
+#endif
     int data[0];        /* numFds + numInts ints */
+#if defined(__clang__)
+#pragma clang diagnostic pop
+#endif
 } native_handle_t;
 
+typedef const native_handle_t* buffer_handle_t;
+
 /*
  * native_handle_close
  * 
@@ -40,6 +59,14 @@ typedef struct native_handle
  */
 int native_handle_close(const native_handle_t* h);
 
+/*
+ * native_handle_init
+ *
+ * Initializes a native_handle_t from storage.  storage must be declared with
+ * NATIVE_HANDLE_DECLARE_STORAGE.  numFds and numInts must not respectively
+ * exceed maxFds and maxInts used to declare the storage.
+ */
+native_handle_t* native_handle_init(char* storage, int numFds, int numInts);
 
 /*
  * native_handle_create
@@ -51,6 +78,15 @@ int native_handle_close(const native_handle_t* h);
 native_handle_t* native_handle_create(int numFds, int numInts);
 
 /*
+ * native_handle_clone
+ *
+ * creates a native_handle_t and initializes it from another native_handle_t.
+ * Must be destroyed with native_handle_delete().
+ *
+ */
+native_handle_t* native_handle_clone(const native_handle_t* handle);
+
+/*
  * native_handle_delete
  * 
  * frees a native_handle_t allocated with native_handle_create().