Add process_vm_readv and process_vm_writev.

Bug: http://b/21761353
Change-Id: Ic8ef3f241d62d2a4271fbc783c8af50257bac498
(cherry picked from commit be57a40d29)

tests/sys_uio_test.cpp

@@ -0,0 +1,27 @@
+/*
+ * Copyright (C) 2015 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 <gtest/gtest.h>
+
+#include <sys/uio.h>
+
+TEST(sys_uio, process_vm_readv_ESRCH) {
+  ASSERT_EQ(0, process_vm_readv(0, nullptr, 0, nullptr, 0, 0));
+}
+
+TEST(sys_uio, process_vm_writev_ESRCH) {
+  ASSERT_EQ(0, process_vm_writev(0, nullptr, 0, nullptr, 0, 0));
+}