1 files changed, 98 insertions, 0 deletions
diff --git a/dom/system/gonk/SystemProperty.cpp b/dom/system/gonk/SystemProperty.cpp
new file mode 100644
index 000000000..1f874ce90
--- /dev/null
+++ b/dom/system/gonk/SystemProperty.cpp
@@ -0,0 +1,98 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "SystemProperty.h"
+
+#include <dlfcn.h>
+#include <string.h>
+
+#include "nsDebug.h"
+#include "prinit.h"
+
+namespace mozilla {
+namespace system {
+
+namespace {
+
+typedef int (*PropertyGet)(const char*, char*, const char*);
+typedef int (*PropertySet)(const char*, const char*);
+
+static void *sLibcUtils;
+static PRCallOnceType sInitLibcUtils;
+
+static int
+FakePropertyGet(const char* key, char* value, const char* default_value)
+{
+  if(!default_value) {
+    value[0] = '\0';
+    return 0;
+  }
+
+  int len = strlen(default_value);
+  if (len >= Property::VALUE_MAX_LENGTH) {
+    len = Property::VALUE_MAX_LENGTH - 1;
+  }
+  memcpy(value, default_value, len);
+  value[len] = '\0';
+
+  return len;
+}
+
+static int
+FakePropertySet(const char* key, const char* value)
+{
+  return 0;
+}
+
+static PRStatus
+InitLibcUtils()
+{
+  sLibcUtils = dlopen("/system/lib/libcutils.so", RTLD_LAZY);
+  // We will fallback to the fake getter/setter when sLibcUtils is not valid.
+  return PR_SUCCESS;
+}
+
+static void*
+GetLibcUtils()
+{
+  PR_CallOnce(&sInitLibcUtils, InitLibcUtils);
+  return sLibcUtils;
+}
+
+} // anonymous namespace
+
+/*static*/ int
+Property::Get(const char* key, char* value, const char* default_value)
+{
+  void *libcutils = GetLibcUtils();
+  if (libcutils) {
+    PropertyGet getter = (PropertyGet) dlsym(libcutils, "property_get");
+    if (getter) {
+      return getter(key, value, default_value);
+    }
+    NS_WARNING("Failed to get property_get() from libcutils!");
+  }
+  NS_WARNING("Fallback to the FakePropertyGet()");
+  return FakePropertyGet(key, value, default_value);
+}
+
+/*static*/ int
+Property::Set(const char* key, const char* value)
+{
+  void *libcutils = GetLibcUtils();
+  if (libcutils) {
+    PropertySet setter = (PropertySet) dlsym(libcutils, "property_set");
+    if (setter) {
+      return setter(key, value);
+    }
+    NS_WARNING("Failed to get property_set() from libcutils!");
+  }
+  NS_WARNING("Fallback to the FakePropertySet()");
+  return FakePropertySet(key, value);
+}
+
+} // namespace system
+} // namespace mozilla