From fd3ea3d11805aef555eca08e2c2a0e1a40714726 Mon Sep 17 00:00:00 2001
From: Chia-I Wu <olv@google.com>
Date: Fri, 23 Sep 2016 11:13:52 +0800
Subject: [PATCH] Add native_handle_clone

libhwbinder's Parcel::readNativeHandleNoDup returns a temporary
native_handle_t.  We want a way to save the temporary handle for later
use.

Change-Id: I16f32043aa8b7d2c0aa57d67551500259b411410
---
 include/cutils/native_handle.h |  9 +++++++++
 libcutils/native_handle.c      | 21 +++++++++++++++++++++
 2 files changed, 30 insertions(+)

diff --git a/include/cutils/native_handle.h b/include/cutils/native_handle.h
index 268c5d3f5..ae9135d61 100644
--- a/include/cutils/native_handle.h
+++ b/include/cutils/native_handle.h
@@ -49,6 +49,15 @@ 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
  * 
diff --git a/libcutils/native_handle.c b/libcutils/native_handle.c
index 61fa38ed4..429076855 100644
--- a/libcutils/native_handle.c
+++ b/libcutils/native_handle.c
@@ -44,6 +44,27 @@ native_handle_t* native_handle_create(int numFds, int numInts)
     return h;
 }
 
+native_handle_t* native_handle_clone(const native_handle_t* handle)
+{
+    native_handle_t* clone = native_handle_create(handle->numFds, handle->numInts);
+    int i;
+
+    for (i = 0; i < handle->numFds; i++) {
+        clone->data[i] = dup(handle->data[i]);
+        if (clone->data[i] < 0) {
+            clone->numFds = i;
+            native_handle_close(clone);
+            native_handle_delete(clone);
+            return NULL;
+        }
+    }
+
+    memcpy(&clone->data[handle->numFds], &handle->data[handle->numFds],
+            sizeof(int) * handle->numInts);
+
+    return clone;
+}
+
 int native_handle_delete(native_handle_t* h)
 {
     if (h) {