Upstream android file related code.

base/shared_memory_android.cc

Index: base/shared_memory_android.cc
diff --git a/base/shared_memory_android.cc b/base/shared_memory_android.cc
new file mode 100644
index 0000000000000000000000000000000000000000..1da0bb7530bc5f332c7fd71ab366fed8b343b5ce
--- /dev/null
+++ b/base/shared_memory_android.cc
@@ -0,0 +1,56 @@
+// Copyright (c) 2011 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 "base/shared_memory.h"
+
+#include <sys/mman.h>
+
+#include "base/logging.h"
+#include "third_party/ashmem/ashmem.h"
+
+namespace base {
+
+// For Android, we use ashmem to implement SharedMemory. ashmem_create_region
+// will automatically pin the region. We never explicitly call pin/unpin. When
+// all the file descriptors from different processes associated with the region
+// are closed, the memory buffer will go away.
+
+bool SharedMemory::CreateNamed(const std::string& name,
+                               bool open_existing, uint32 size) {
+  DCHECK_EQ(-1, mapped_file_ );
+
+  // "name" is just a label in ashmem. It is visible in /proc/pid/maps.
+  mapped_file_ = ashmem_create_region(name.c_str(), size);
+  if (-1 == mapped_file_) {
+    DLOG(ERROR) << "Shared memory creation failed";
+    return false;
+  }
+
+  int err = ashmem_set_prot_region(mapped_file_,
+                                   PROT_READ | PROT_WRITE | PROT_EXEC);
+  if (err < 0) {
+    DLOG(ERROR) << "Error " << err << " when setting protection of ashmem";
+    return false;
+  }
+  created_size_ = size;
+
+  return true;
+}
+
+bool SharedMemory::Delete(const std::string& name) {
+  // ashmem doesn't support name mapping
+  NOTIMPLEMENTED();
+  return false;
+}
+
+bool SharedMemory::Open(const std::string& name, bool read_only) {
+  // ashmem doesn't support name mapping
+  NOTIMPLEMENTED();
+  return false;
+}
+
+int SharedMemory::GetAshmenSizeRegion() {
+  return ashmem_get_size_region(mapped_file_);
+}
+}  // namespace base

[brettw, 2011/06/20 03:50:40]

Nit: extra blank line before this.

[michaelbai, 2011/06/20 22:50:36]

Done.