Merge "Added implementation of shared memory NDK API"

native/android/Android.mk

@@ -19,6 +19,7 @@ LOCAL_SRC_FILES:= \
     net.c \
     obb.cpp \
     sensor.cpp \
+    sharedmem.cpp \
     storage_manager.cpp \
     trace.cpp \
 

native/android/libandroid.map.txt

@@ -186,6 +186,9 @@ LIBANDROID {
     ASensor_getType;
     ASensor_getVendor;
     ASensor_isWakeUpSensor; # introduced=21
+    ASharedMemory_create; # introduced=26
+    ASharedMemory_getSize; # introduced=26
+    ASharedMemory_setProt; # introduced=26
     AStorageManager_delete;
     AStorageManager_getMountedObbPath;
     AStorageManager_isObbMounted;

native/android/sharedmem.cpp

@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <android/sharedmem.h>
+#include <cutils/ashmem.h>
+#include <utils/Errors.h>
+
+int ASharedMemory_create(const char *name, size_t size) {
+    if (size == 0) {
+        return android::BAD_VALUE;
+    }
+    return ashmem_create_region(name, size);
+}
+
+size_t ASharedMemory_getSize(int fd) {
+    return ashmem_valid(fd) ? ashmem_get_size_region(fd) : 0;
+}
+
+int ASharedMemory_setProt(int fd, int prot) {
+    return ashmem_set_prot_region(fd, prot);
+}