Update mojo sdk to rev f6c8ec07c01deebc13178d516225fd12695c3dc2

mojo/edk/embedder/simple_platform_shared_buffer_android.cc

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "mojo/edk/embedder/simple_platform_shared_buffer.h"
+
+#include <stdint.h>
+#include <sys/mman.h>   // For |mmap()|/|munmap()|.
+#include <sys/types.h>  // For |off_t|.
+#include <unistd.h>
+
+#include <limits>
+
+#include "base/files/scoped_file.h"
+#include "base/logging.h"
+#include "base/macros.h"
+#include "mojo/edk/embedder/platform_handle.h"
+#include "third_party/ashmem/ashmem.h"
+
+namespace mojo {
+namespace embedder {
+
+// SimplePlatformSharedBuffer --------------------------------------------------
+
+bool SimplePlatformSharedBuffer::Init() {
+  DCHECK(!handle_.is_valid());
+
+  if (static_cast<uint64_t>(num_bytes_) >
+      static_cast<uint64_t>(std::numeric_limits<off_t>::max())) {
+    return false;
+  }
+
+  base::ScopedFD fd(ashmem_create_region(nullptr, num_bytes_));
+  if (!fd.is_valid()) {
+    DPLOG(ERROR) << "ashmem_create_region()";
+    return false;
+  }
+
+  if (ashmem_set_prot_region(fd.get(), PROT_READ | PROT_WRITE) < 0) {
+    DPLOG(ERROR) << "ashmem_set_prot_region()";
+    return false;
+  }
+
+  handle_.reset(PlatformHandle(fd.release()));
+  return true;
+}
+
+bool SimplePlatformSharedBuffer::InitFromPlatformHandle(
+    ScopedPlatformHandle platform_handle) {
+  DCHECK(!handle_.is_valid());
+
+  if (static_cast<uint64_t>(num_bytes_) >
+      static_cast<uint64_t>(std::numeric_limits<off_t>::max())) {
+    return false;
+  }
+
+  int size = ashmem_get_size_region(platform_handle.get().fd);
+
+  if (size < 0) {
+    DPLOG(ERROR) << "ashmem_get_size_region()";
+    return false;
+  }
+
+  if (static_cast<size_t>(size) != num_bytes_) {
+    LOG(ERROR) << "Shared memory region has the wrong size";
+    return false;
+  }
+
+  handle_ = platform_handle.Pass();
+  return true;
+}
+
+}  // namespace embedder
+}  // namespace mojo